In recent years, the performance requirements of steel is getting higher and higher. The higher the cleanliness of steel, alumina brick the better the performance. Steel impurity content reaches a certain level, the performance of steel will be a qualitative change. Steel oxygen, sulfur, phosphorus, hydrogen, nitrogen content of the five elements should be as low as possible. At present, the sum of the harmful elements coil grout [C, S, P, N, H, TO] in clean steel (IF steel and pipeline steel, etc.) produced at home and abroad advanced process can be controlled below 100 × 10-6, Some scholars have proposed the concept of ultra-clean steel, and defined as inclusions [C, S, P, N, H, TO] and the sum of 40 × 10-6 the following. Clean steel production is inseparable from the hot metal pretreatment, converter decarburization, refining and other secondary refining process optimization and control, and is also closely related to the use of refractory material, refined molten steel is likely to be continuous casting refractory pollution, Oxygen, nitrogen, hydrogen and other elements, so in the production of clean steel, refractory used in the study and reasonable choice is very important.
Continuous casting refractories Ladle Permeable Brick in clean steel production of molten steel in the carbon, nitrogen has a significant impact, the correct selection can be adsorbed molten steel sulfur, phosphorus inclusions, the purification of molten steel. In the production of clean steel should be selected alkaline, especially calcium refractories ladle slide gate, should adopt carbon-free, silicon-free or low-carbon low-silicon material. Metallurgical workers and the future direction of research refractories, refractories are continuous casting with functional, longevity and environmental protection.
2016年10月9日星期日
Correct Selection of Refractory material for Hot Air Furnace
Hot blast stove is the key to the relationship between the blast furnace system, hot blast furnace furnace life of the generation of the age has an important impact, to improve the life of hot stove, refractory brick and refractory mud should be selected in addition to good refractory Quench , Masonry should also have a good overall structural strength, so that the sealing is good, good insulation.
According to the temperature inside the furnace, the refractory material lining is low cement high-aluminum heat-resisting material, and the refractory lining thickness is determined according to the heat transfer calculation, and the outer surface temperature of the hot-blast stove should not be higher than 60 DEG C under the ambient temperature. The refractory lining material of hot blast stove must have factory certificate and pass the inspection of third party authority.
Refractory brick used for blast furnace in the hot blast furnace selection it is necessary to consider life expectancy, but also consider the cost. In the hot stove in the lower part of the clay brick and high alumina brick. In the upper part of the hot stove, high temperature is adopted, and silica brick is used. refractories mud selection and brick with a matching chemical composition, high temperature performance of the corresponding higher grades. In the furnace shell and insulation lining choice spray coating material as a protective layer, to avoid the furnace of harmful components of the erosion of the shell, the specific choice may be based on the actual situation.
According to the temperature inside the furnace, the refractory material lining is low cement high-aluminum heat-resisting material, and the refractory lining thickness is determined according to the heat transfer calculation, and the outer surface temperature of the hot-blast stove should not be higher than 60 DEG C under the ambient temperature. The refractory lining material of hot blast stove must have factory certificate and pass the inspection of third party authority.
Refractory brick used for blast furnace in the hot blast furnace selection it is necessary to consider life expectancy, but also consider the cost. In the hot stove in the lower part of the clay brick and high alumina brick. In the upper part of the hot stove, high temperature is adopted, and silica brick is used. refractories mud selection and brick with a matching chemical composition, high temperature performance of the corresponding higher grades. In the furnace shell and insulation lining choice spray coating material as a protective layer, to avoid the furnace of harmful components of the erosion of the shell, the specific choice may be based on the actual situation.
2016年8月8日星期一
Fused Cast AZS Block and Glass Defects
Fused cast AZS block exudation is thought as the leading cause of knot and cord defects. Fused cast AZS exudation is only a short-term source of glass defects. Fused cast AZS corrosion is a more potent and long-term source of defects. Glass melt contact refractory corrosion castable refractory material can lessen with time due to boundary layer formation and the effect of external cooling at the metal line.
The interaction of glass melts and refractories in glass furnaces has a large impact on the resulting glass quality. The mostly applied type of refractory in the glass industry, in direct contact with the glass melt, is fused cast AZS. Due to the interaction of the glass melt clay insulating bricks with fused cast AZS, glass defects like stones, knots and bubbles can be generated.
Fused cast AZS block has no open porosity but there are some closed voids and pores which arise from the manufacturing process. These pores are filled with gases. The gases in these pores refractory fiber board have an air like composition, with nitrogen and oxygen as main components and some carbon dioxide. When fused cast AZS is in contact with glass, it reacts with the glass melt and slowly dissolves in this melt. The closed pores will be opened and then release their gas content, forming bubbles.
Impurities, which can oxidize, are for example elemental carbon originating from graphite electrodes of the fused casting operation, sulfur or zirconium carbide originating from raw materials of the AZS. The dissociation/oxidation of nitrides/oxynitrides, produced by reactions with the graphite electrodes during melting of the AZS, could give nitrogen insulating castable gas.
The generation of a knot is due to one or more forces, which drive the fused cast AZS glass phase towards the refractory surface and into the bulk of the glass melt. Those forces can be caused by gravity, thermal expansion of zirconia and gas formation.
Glass defects are typically unavoidable, but their occurrence must be minimized during the production of high-quality glasses. Some alternatives, such as fused cast AZS with modified chemistry and glassy phase and alpha-beta fused cast alumina block are used to replace fused cast AZS to reduce the glass defects and improve the glass quality.
When fused cast AZS block is brought into contact with a glass melt, an electrical potential is generated between the refractory and the glass melt because generally no thermodynamic equilibrium exists between these materials. The electromotive force (emf) generated between glass melt and refractory interior can cause the formation of oxygen bubbles.
Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory material,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
The interaction of glass melts and refractories in glass furnaces has a large impact on the resulting glass quality. The mostly applied type of refractory in the glass industry, in direct contact with the glass melt, is fused cast AZS. Due to the interaction of the glass melt clay insulating bricks with fused cast AZS, glass defects like stones, knots and bubbles can be generated.
Fused cast AZS block has no open porosity but there are some closed voids and pores which arise from the manufacturing process. These pores are filled with gases. The gases in these pores refractory fiber board have an air like composition, with nitrogen and oxygen as main components and some carbon dioxide. When fused cast AZS is in contact with glass, it reacts with the glass melt and slowly dissolves in this melt. The closed pores will be opened and then release their gas content, forming bubbles.
Impurities, which can oxidize, are for example elemental carbon originating from graphite electrodes of the fused casting operation, sulfur or zirconium carbide originating from raw materials of the AZS. The dissociation/oxidation of nitrides/oxynitrides, produced by reactions with the graphite electrodes during melting of the AZS, could give nitrogen insulating castable gas.
The generation of a knot is due to one or more forces, which drive the fused cast AZS glass phase towards the refractory surface and into the bulk of the glass melt. Those forces can be caused by gravity, thermal expansion of zirconia and gas formation.
Glass defects are typically unavoidable, but their occurrence must be minimized during the production of high-quality glasses. Some alternatives, such as fused cast AZS with modified chemistry and glassy phase and alpha-beta fused cast alumina block are used to replace fused cast AZS to reduce the glass defects and improve the glass quality.
When fused cast AZS block is brought into contact with a glass melt, an electrical potential is generated between the refractory and the glass melt because generally no thermodynamic equilibrium exists between these materials. The electromotive force (emf) generated between glass melt and refractory interior can cause the formation of oxygen bubbles.
Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory material,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
What Is Fused Cast Alumina Block
Clay, High Alumina insulating bricks First melt the raw materials in an electric arc furnace. When the material has become molten and its chemical and physical characteristics have been adjusted to the desired condition, pour the ladle slide gate molten material into a mold. Then the cast product is processed with machines into the final product.
Fused cast alumina block is made of pure alumina powder(>95%) and a small amount of additions (soda sand and quartz sand). There are commercially 3 types of fused cast alumina blocks: Beta fused ceramic fiber felt cast alumina block, Alpha-beta Fused cast Alumina Block and Alpha fused cast alumina block.
Beta fused cast alumina block comprises of a majority of beta alumina crystals and a slight portion of alpha alumina crystals in compact structure. Moreover, the intersected texture of large beta-alumina ensures great dimensional stability and great resistance against spalling. Its property of base saturation enables a higher resistance to alkali vapor, thus it has excellent thermal shock resistance and does not form molten droplets. It is the best material for molter crown, port crown,feeder channel,ect. Its neutrality against soda vapors makes it the best choice for the downstream part of superstructures in demanding applications.
Alpha fused cast alumina block is ladle castable an ideal product for the lower temperature zones of the glass melting furnaces due to its high density, superior corrosion resistance and low blister potential. It is also an ideal material for Metallurgical Titanium Furnace because the superior thermal stability.
Alpha-beta Fused cast Alumina Block is formed by the compact structure of alpha alumina and beta alumina crystals in a most ideal proportion which is approximately 50% and 50% respectively,where intertwined crystals of both materials result in a very dense structure. Below 1350 ℃, it has excellent corrosion resistance against molten glass and great performance against contamination to molten glass, thus it is very suitable for paving blocks and fore-hearth channel blocks. When in contact with molten glass, it barely produces any blistering or stones. So, it may be widely used in working tank, feeder channels, superstructures and lipstone, etc. In soda-lime container furnaces, it is installed in the Alcove and channel areas, as alternative to fused cast AZS for Alcoves and as alternative to AZS fused-cast, zirmul, sinter-alumina and other sinter refractories for channels.
Henan Xinmi Changxing Refractory Material Co., Ltd. high insulating brick Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
Fused cast alumina block is made of pure alumina powder(>95%) and a small amount of additions (soda sand and quartz sand). There are commercially 3 types of fused cast alumina blocks: Beta fused ceramic fiber felt cast alumina block, Alpha-beta Fused cast Alumina Block and Alpha fused cast alumina block.
Beta fused cast alumina block comprises of a majority of beta alumina crystals and a slight portion of alpha alumina crystals in compact structure. Moreover, the intersected texture of large beta-alumina ensures great dimensional stability and great resistance against spalling. Its property of base saturation enables a higher resistance to alkali vapor, thus it has excellent thermal shock resistance and does not form molten droplets. It is the best material for molter crown, port crown,feeder channel,ect. Its neutrality against soda vapors makes it the best choice for the downstream part of superstructures in demanding applications.
Alpha fused cast alumina block is ladle castable an ideal product for the lower temperature zones of the glass melting furnaces due to its high density, superior corrosion resistance and low blister potential. It is also an ideal material for Metallurgical Titanium Furnace because the superior thermal stability.
Alpha-beta Fused cast Alumina Block is formed by the compact structure of alpha alumina and beta alumina crystals in a most ideal proportion which is approximately 50% and 50% respectively,where intertwined crystals of both materials result in a very dense structure. Below 1350 ℃, it has excellent corrosion resistance against molten glass and great performance against contamination to molten glass, thus it is very suitable for paving blocks and fore-hearth channel blocks. When in contact with molten glass, it barely produces any blistering or stones. So, it may be widely used in working tank, feeder channels, superstructures and lipstone, etc. In soda-lime container furnaces, it is installed in the Alcove and channel areas, as alternative to fused cast AZS for Alcoves and as alternative to AZS fused-cast, zirmul, sinter-alumina and other sinter refractories for channels.
Henan Xinmi Changxing Refractory Material Co., Ltd. high insulating brick Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
2016年7月5日星期二
New Types of Refractory For The Glass Furnace
refractories can be used at 1700℃ and has better mechanical strength and thermal stability.
In the past, high chromium brick was mainly used for the production of reinforced glass and sometimes in the insulation castable refractory material glass furnace. Now it is increasingly used in some soda-lime glass furnaces. It has much better corrosion resistance to glass and can prolong the service life of throat. Besides the throat, it is also used in the end wall, the angle brick of the feeder port. However, clay insulating bricks the chromium may color the glass liquid, thus it can not be used in the white glass furnace. It was primarily used in the colored glass furnace, but now it has been successfully used in the transparent container glass furnace.
Low glass phase fused cast AZS block has been successfully used in the superstructure. The development of the oxygen-fuel combustion technology makes it find wider application in the superstructure. Since it contains a low amount of glass phase, it has better creep refractory fiber board resistance and the amount of exuded glass phase has been reduced to a very low level.
Fused cast high zirconia block is a new type of refractory, mainly used in the glass contact areas in high quality glass furnace. It has a low potential of causing stones, knots and bubbles and can effectively reduce glass defects. It is also in some low alkali glass or hard borosilicate glass furnaces.
The need of the glass manufacturers to maintain and improve the quality of glass and expand the service life of the glass furnace and the impact and influence of the oxygen-fuel combustion technology, promote the improvement of refractories and development of the new insulating castable refractories.
Fused cast alumina block has been widely used in the crown of the oxygen-fuel furnace, especially when manufacturing high quality glass. Before the application of the oxygen-fuel combustion technology, only β alumina block is used in the superstructure of the melting furnace. Now both β fused cast alumina block and α-β fused cast alumina block can be used in the crown of the oxygen-fuel furnace for producing TV glass, float glass and borosilicate glass.
Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
product list:
http://www.yilongrefractory.com/AllProductServlet?id=2&number=20
In the past, high chromium brick was mainly used for the production of reinforced glass and sometimes in the insulation castable refractory material glass furnace. Now it is increasingly used in some soda-lime glass furnaces. It has much better corrosion resistance to glass and can prolong the service life of throat. Besides the throat, it is also used in the end wall, the angle brick of the feeder port. However, clay insulating bricks the chromium may color the glass liquid, thus it can not be used in the white glass furnace. It was primarily used in the colored glass furnace, but now it has been successfully used in the transparent container glass furnace.
Low glass phase fused cast AZS block has been successfully used in the superstructure. The development of the oxygen-fuel combustion technology makes it find wider application in the superstructure. Since it contains a low amount of glass phase, it has better creep refractory fiber board resistance and the amount of exuded glass phase has been reduced to a very low level.
Fused cast high zirconia block is a new type of refractory, mainly used in the glass contact areas in high quality glass furnace. It has a low potential of causing stones, knots and bubbles and can effectively reduce glass defects. It is also in some low alkali glass or hard borosilicate glass furnaces.
The need of the glass manufacturers to maintain and improve the quality of glass and expand the service life of the glass furnace and the impact and influence of the oxygen-fuel combustion technology, promote the improvement of refractories and development of the new insulating castable refractories.
Fused cast alumina block has been widely used in the crown of the oxygen-fuel furnace, especially when manufacturing high quality glass. Before the application of the oxygen-fuel combustion technology, only β alumina block is used in the superstructure of the melting furnace. Now both β fused cast alumina block and α-β fused cast alumina block can be used in the crown of the oxygen-fuel furnace for producing TV glass, float glass and borosilicate glass.
Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
product list:
http://www.yilongrefractory.com/AllProductServlet?id=2&number=20
Suggestions On The Proper Use Of Fused Cast AZS
silica brick (such as the front wall of the feeder pool),each material should have its own structure, because they have different volume changes at high temperature. For the superstructure that is less than 8m, there is no need to leave expansion joints. For the superstructure ceramic fiber felt that is longer than 8m, it is recommended to divide it into several parts by expansion joints(4-6mm).
There are masonry joints between the sidewall block and the bottom block. When the refractory materials are heated, 4-5mm volume expansion per meter will be expanded into the masonry joints.
Fused cast AZS block has a higher thermal conductivity. When used in the sidewall, it parts near the liquid ladle castable level require bigger cooling air flow.
Based on the campaign life of the glass furnace, the indicators of the furnace operation and the physical and chemical properties and performance of fused cast AZS block, some reasonable suggestions high insulating brick are made on the proper use of the fused cast AZS.
Fused cast AZS is characterized with stable and dense structure and good corrosion resistance to glass. During 900-1200℃, it will have a abnormal volume expansion due to its crystal phase transition.
Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractories brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
product list:
http://www.yilongrefractory.com/AllProductServlet?id=4&number=20
There are masonry joints between the sidewall block and the bottom block. When the refractory materials are heated, 4-5mm volume expansion per meter will be expanded into the masonry joints.
Fused cast AZS block has a higher thermal conductivity. When used in the sidewall, it parts near the liquid ladle castable level require bigger cooling air flow.
Based on the campaign life of the glass furnace, the indicators of the furnace operation and the physical and chemical properties and performance of fused cast AZS block, some reasonable suggestions high insulating brick are made on the proper use of the fused cast AZS.
Fused cast AZS is characterized with stable and dense structure and good corrosion resistance to glass. During 900-1200℃, it will have a abnormal volume expansion due to its crystal phase transition.
Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractories brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
product list:
http://www.yilongrefractory.com/AllProductServlet?id=4&number=20
2016年6月29日星期三
Key Factors For The Casting Process Of Fused Cast AZS
The casting speed determines the casting time. Every casting products has its best casting time. Improper insulating castable casting time will cause many defects. If the casting speed is too fast, the stream will be coarse and the flowing speed will be too fast, which will produce big impact force on the mold. The force may destroy or melt the refractory brick mold and cause protrusions. Additionally, gas will be brought into the mold and produce a thin shell filled with gas and bubbles in the casting. Besides gas, raw materials in the furnace mouth may be brought into the melt and cause defects. Conversely, if the casting speed is too slow, it will produce defects such as loose corners, knots, sand and pouring shortage.
Back pour refers to the process of repouring some melt into the shrinkage cavities after the casting is completed. Generally, refractory brick for sale small bricks are solidified quickly and do not require back pour. Medium bricks can be repoured. Large bricks require back pour and it takes a long time. Back pour is one of the effective ways to reduce the shrinkage cavities and improve the bulk density.
Casting is an important step of the manufacturing process that has great influence on the quality of the fused cast AZS block. Key factors that affect the casting process of fused cast refractories AZS include the casting temperature, casting speed, the casting time and back pour.
The casting temperature is the temperature of the melt when it is poured into the mold. The casting temperature of fused cast AZS can be as high as 1820-1840℃. The viscosity of the melt is up to the chemical composition and temperature of the melt. The chemical composition is up to the formulation. The casting temperature is crucial since the higher the temperature, the lower the viscosity, the better the flow-ability. However, if the temperature is too high, the temperature difference between the casting and the mold is small, which will increase the shrinkage stress and cause cracks.
refractory company Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
Back pour refers to the process of repouring some melt into the shrinkage cavities after the casting is completed. Generally, refractory brick for sale small bricks are solidified quickly and do not require back pour. Medium bricks can be repoured. Large bricks require back pour and it takes a long time. Back pour is one of the effective ways to reduce the shrinkage cavities and improve the bulk density.
Casting is an important step of the manufacturing process that has great influence on the quality of the fused cast AZS block. Key factors that affect the casting process of fused cast refractories AZS include the casting temperature, casting speed, the casting time and back pour.
The casting temperature is the temperature of the melt when it is poured into the mold. The casting temperature of fused cast AZS can be as high as 1820-1840℃. The viscosity of the melt is up to the chemical composition and temperature of the melt. The chemical composition is up to the formulation. The casting temperature is crucial since the higher the temperature, the lower the viscosity, the better the flow-ability. However, if the temperature is too high, the temperature difference between the casting and the mold is small, which will increase the shrinkage stress and cause cracks.
refractory company Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
2016年6月26日星期日
What is Spun Ceramic Fiber Blanket
 |
| Ceramic Fiber Blanket |
The heat capacity of spun ceramic fiber blanket is only 1/10 of that of lightweight refractories lining and light castable refractory material lining. The heat capacity of the lining material is is proportional to its weight. Low heat capacity means less heat absorption of the furnace in the reciprocating operation and higher heating rate. It can greatly reduce energy consumption of the temperature operation control, refractory company especially the start and shutedown of the heating furnace.
Spun ceramic fiber blanket is made of spun ceramic fiber cotton by needling, heat setting, vertically and horizontally cutting and rolling. Ceramic fiber blankets with different thickness and density provide a wide range of choice of materials to obtain the best insulation and energy efficiency.
Spun ceramic fiber blanket has uniform diameter, long fiber and low content of slag balls. Its interleaving degree, delamination, properties, erosion ressitance, flexibility and tensile strength are all improved, which improves the application performance of spun blanket and reduces the material loss. Spun blanket does not contain any binding agent to ensure that products have good reliability and stability in various environments.
Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick , refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
http://www.yilongrefractory.com/AllProductServlet?id=1&number=20
2016年6月23日星期四
The Economy of Fused Cast Bricks in Glass Furnaces
refractories safely in the 1680℃. AZS also has excellent corrosion resistance to fly ash and vapor firebrick refractory sale of volatile components. Therefore, the temperature of the furnace can be increased to 100℃. Ina addition, there is a low risk of burning of materials. The crown is low, which increases the heat radiation and improve the melting rate and reduce the energy consumption.
Since 1965, the fused cast AZS crown high insulating brick has been used. The crown was initially built with common silica brick, mainly used in the glass fiber and borosilicate glass melting furnace. The fused cast AZS crown as well as the insulation method began to be actually used and its application was even expanded to large soda lime glass melting furnaces. In 1974, the structure was used in large cross-fired furnaces with a span of 11m. Besides, it is also used in the container glass furnace in castable refractory material France and can reduce 130 liters heavy oil per ton.
Fused cast AZS block has been used in the checker work of the regenerator and the crown in the glass furnace.
Fused cast AZS block has excellent resistance to the erosion by fly ash to the checker brick in the regenerator, which is confirmed by its application in the burner. Fused cast AZS is durable refractory fiber board than other bricks even it is only used in the upper layer of the checker work.
The performance of fused cast AZS block in the crown has been confirmed in the furnace with a small span. It shows excellent resistance. The new fused cast AZS crown structure as well as the insulation method developed by R.E.R from France has been used in the glass furnaces with a span of 11m and large furnaces. It is characterized by the use of light and firm magnetic structure and complete insulation with a 500mm insulation layer.
Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
Since 1965, the fused cast AZS crown high insulating brick has been used. The crown was initially built with common silica brick, mainly used in the glass fiber and borosilicate glass melting furnace. The fused cast AZS crown as well as the insulation method began to be actually used and its application was even expanded to large soda lime glass melting furnaces. In 1974, the structure was used in large cross-fired furnaces with a span of 11m. Besides, it is also used in the container glass furnace in castable refractory material France and can reduce 130 liters heavy oil per ton.
Fused cast AZS block has been used in the checker work of the regenerator and the crown in the glass furnace.
Fused cast AZS block has excellent resistance to the erosion by fly ash to the checker brick in the regenerator, which is confirmed by its application in the burner. Fused cast AZS is durable refractory fiber board than other bricks even it is only used in the upper layer of the checker work.
The performance of fused cast AZS block in the crown has been confirmed in the furnace with a small span. It shows excellent resistance. The new fused cast AZS crown structure as well as the insulation method developed by R.E.R from France has been used in the glass furnaces with a span of 11m and large furnaces. It is characterized by the use of light and firm magnetic structure and complete insulation with a 500mm insulation layer.
Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
2016年6月6日星期一
Properties and applications of fused cast AZS
tundish well block the most widely used fused cast refractory brick. According to the ZrO2 content, it can be divided into 33#, 36# and 41#AZS.
Fused cast AZS magnesia carbon brick containing 33% ZrO2 is called 33# fused cast AZS; fused cast AZS containing 36% ZrO2 is called 36# fused cast AZS; fused cast AZS containing 41% ZrO2 is called 41# fused cast AZS.
Fused cast AZS is mainly composed of baddeleyite and corundum and their eutectic crystals. High viscosity glass phase is filled in the gaps of crystals. The crystals is directly precipitated monoblock stopper from the molten liquid and well developed. So, it has large crystal particles and stable crystal phase. Except the voids, it has compact structure and better density than the common sintered bricks. The pores are mainly closed pores and the crystals are intertwined each other, so it ladle slide gate has good mechanical properties and wear resistance. The impurities are difficult to invade the bricks. Therefore, this refractory brick has good corrosion resistance. besides, the transformation of ZrO2 at 900~1150℃ when heating or cooling may cause irregular deformation.
Fused cast AZS block can be used in areas in direct contact with molten metals and molten slags. It is the essential material used in the key areas that suffer from severe corrosion.
refractory company Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
Nest article:
Fused cast AZS magnesia carbon brick containing 33% ZrO2 is called 33# fused cast AZS; fused cast AZS containing 36% ZrO2 is called 36# fused cast AZS; fused cast AZS containing 41% ZrO2 is called 41# fused cast AZS.
Fused cast AZS is mainly composed of baddeleyite and corundum and their eutectic crystals. High viscosity glass phase is filled in the gaps of crystals. The crystals is directly precipitated monoblock stopper from the molten liquid and well developed. So, it has large crystal particles and stable crystal phase. Except the voids, it has compact structure and better density than the common sintered bricks. The pores are mainly closed pores and the crystals are intertwined each other, so it ladle slide gate has good mechanical properties and wear resistance. The impurities are difficult to invade the bricks. Therefore, this refractory brick has good corrosion resistance. besides, the transformation of ZrO2 at 900~1150℃ when heating or cooling may cause irregular deformation.
Fused cast AZS block can be used in areas in direct contact with molten metals and molten slags. It is the essential material used in the key areas that suffer from severe corrosion.
refractory company Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
Nest article:
Introduction of Changxing Refractory self-flow castable
2016年6月2日星期四
The Composition and Properties of Magnesia Brick
 |
| Alumina Magnesia Carbon Bricks is made from high quality bauxite, corundum and fused magnesia. It is formulated with very high purity alumina and magnesia. |
Magnesia brick is composed of 80-90% periclase and 8%-20% other mineral phase including magnesium ferrite (MgO·Fe2O3), forsterite (2MgO · SiO2) and Calcium and magnesium refractory brick for sale olive stone (CaO·MgO·SiO2).Silicate glass contains about 3-5% magnesium, calcium and iron. These silicates may contain tricalcium silicate (3CaO · SiO2), magnesium rhodonite (3CaO · MgO · 2SiO2), calcium and magnesium olivine and forsterite, dicalcium silicate (2CaO · SiO2).
Magnesia brick has good thermal conductivity, good thermal expansion, good corrosion resistance to alkali molten slags and bad corrosion resistance to acid molten slags. Due to the low-melting silicate cements surrounded periclase, the beginning point of the softening temperature under load is not too high, but the collapse temperature is close to the beginning point. Its refractoriness is over 2000℃, but it does not make sense in the actual refractory castable use. Bad thermal shock stability is one of the main reasons for the destruction.
In the storage and transport, special attention should be paid to moisture-proof to avoid burst after affected with damp.
refractory company Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractories nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
Nest article:
Formation of smelting furnace slag layer
The Matrix Of Refractory Materials
 |
Bottom Frame &Skid Platform Brick for Heating Furnace |
Matrix has a decisive impact insulating castable on the properties of refractory products. During the use, the samage of refractories always starts from the matrix. Changing the matrix of refractories is an effective way to improve the properties of products.
Most refractory materials, refractory material according to the main crystal phase and matrix, can be divided into two types: refractories containing crystal phases and glass phase and refractories only containing crystals. The former includes fireclay brick, alumina brick silica brick, etc.. The latter includes magnesia brick, magnesia chrome brick, etc..
These products are fired at high temperature and contain a certain amount of liquid phase. refractory brick The liquid will not form glass phase when cooled but the crystalline matrix which is bonded together with the main crystal phase. The matrix crystal phases are different from the main crystal phase.
Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
related articles：
EAF roof damage mechanism and applicated refractory materials
2016年5月26日星期四
Application of monolithic refractories on industrial furnaces
 |
| This product enjoys performances of purifying liquid steel, prevent liquid steel oxidation, with good liquid steel washing resistance and erosion resistance. |
Unshaped refractory material is a supporting material for building furnace, which can be divided into two categories: ramming material and casting material. They are widely applied on industrial furnace, mainly used in the furnace bottom portion, inconvenient construction part and masonry part of cooling element.
There are varieties of monolithic refractories, but the specific application on the flash furnace can be divided into four broad categories according to the chemical composition, such as magnesium chrome material, magnesium material, high alumina and clay. Structure of Flash Furnace is more complex, which need moremonolithic refractories, the selection of material is based on using position, such as magnesium chromium castables is used on H-beam part, the connecting part can be built with magnesium chromium castable, magnesia castable or high purity alumina castable; in general part of the furnace, the magnesium chrome castables or magnesia castables are available according to the wall structure, in these areas, it requires better mobility. At the bottom of the furnace, magnesium chromium ramming mass is available to be used under the magnesium-chrome brick layer, clay ramming mass is to be used under clay bricks layer.
Article resourse:
Next Article:
2016年5月23日星期一
Fire clay bricks manufacturing process
 |
Generality High Alumina Brick &Clay Brick |
1)Obtain raw materials. tundish well block The clay for manufacturing bricks is obtained from the ancient soil deep under the earth’s surface. The soil in this layer is slightly deeper in color
than the topsoil and was formed about 80,000 to 120,000 years ago. At that time, the climate is warm and humid and plants are diverse and lush , which mades the soil in this
period soft and sticky and a Clay, High Alumina insulating bricks good raw material for fireclay bricks.
2)The clay is stacked in the open air for up to six months to make its inner structure loose. Then it is zirconium sizing nozzle crushed and screened to get the pure fine clay.
3)Add water to the clay and then repeat kneading to make it into thick mud. This step is very important for the finished products.
4)Puur the mud into the mold. tundish coating Compact it and then remove the remaining mud with a wire bow.
5)Release the green body from the mold and dry it in the shadow to avoid cracks and deformation caused by exposure to the sun.
6)After drying, fire bricks in the kiln. This process is the most important part of the brick-manufacturing process.
7)After ten days of firing, the green body is basically sintered. if stopping heating at this time, the outside air may come into the kiln and make the bricks oxidized into red
bricks. in order to prevent oxidazing, seal the kiln roof with clay.
Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more
than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.
2016年5月17日星期二
The advantages of Changxing lightweight insulation brick
nozzle refractory Compared to the traditional "galvanized plate+ insulation cotton" duct, Changxing lightweight insulation brick has the following advantages.
Changxing lightweight insulation brick, using high pure mullite as raw material, is made by adding alumina dry vibration mix powder according to different type and then sintering in high temperature.
1. The energy-saving effects of lightweight insulation brick can be increased by 10% to 15%, having more advantages than the traditional products on energy-saving and insulation aspects
2. Compared to traditional covering agent products, the new lightweight insulation brick’s service life extends three times.
3. When contacting burning fire, lightweight insulation brick is non-smoking and non-toxic gases being released.
4. When lightweight insulation brick used in construction, no condensation water produced, sealing effect is much better.
5. At the same time lightweight insulation brick can reduce 5 to 10 decibels noise.
6. Lightweight firebrick refractory sale insulation brick can shorten project duration 3 to 5 times, reduce 20% project cost
7. Lightweight insulation brick’s output up to 120,000 pieces / day, assure prompt delivery.
8. Manufactured as per ASTM standard
Above all, compared with traditional products, Changxing lightweight insulation brick from insulation effect and environmental protection aspects is more advantageous and it has low cost and strong seal . Applied in smelting furnace, firing kiln, flue, refining apparatus, heating apparatus, reproducing apparatus, gas stoves and pipes, soaking furnace, annealing furnace, reaction chambers, and other similar industrial heat treat equipment.
Changxing lightweight insulation brick, using high pure mullite as raw material, is made by adding alumina dry vibration mix powder according to different type and then sintering in high temperature.
1. The energy-saving effects of lightweight insulation brick can be increased by 10% to 15%, having more advantages than the traditional products on energy-saving and insulation aspects
2. Compared to traditional covering agent products, the new lightweight insulation brick’s service life extends three times.
3. When contacting burning fire, lightweight insulation brick is non-smoking and non-toxic gases being released.
4. When lightweight insulation brick used in construction, no condensation water produced, sealing effect is much better.
5. At the same time lightweight insulation brick can reduce 5 to 10 decibels noise.
6. Lightweight firebrick refractory sale insulation brick can shorten project duration 3 to 5 times, reduce 20% project cost
7. Lightweight insulation brick’s output up to 120,000 pieces / day, assure prompt delivery.
8. Manufactured as per ASTM standard
Above all, compared with traditional products, Changxing lightweight insulation brick from insulation effect and environmental protection aspects is more advantageous and it has low cost and strong seal . Applied in smelting furnace, firing kiln, flue, refining apparatus, heating apparatus, reproducing apparatus, gas stoves and pipes, soaking furnace, annealing furnace, reaction chambers, and other similar industrial heat treat equipment.
2016年5月5日星期四
Being one of the reputed organizations in the market
we are engaged in offering an exclusive range of Ceramic Fiber Braided Rope. Popular for their abrasion refractory material resistance feature, offered braided ropes are manufactured by our capable vendors using unequaled quality material and cutting edge tools. alumina brick Provided range is obtainable in various specifications refractory brick and modified options as per clients’ diversified necessities.
Features:
Perfectly finished
Maximum strength
Surpassed quality
http://www.yilongrefractory.com/news/Several%20types%20and%20application%20of%20ceramic%20fibers.html
Features:
Perfectly finished
Maximum strength
Surpassed quality
http://www.yilongrefractory.com/news/Several%20types%20and%20application%20of%20ceramic%20fibers.html
2016年4月27日星期三
Silicon nitride is a chemical compound of silicon and nitrogen
In addition to Si3N4, refractory material several other silicon nitride phases (with chemical formulas corresponding to varying degrees of nitridation/Si oxidation state) have been reported in the literature, for example, the gaseous disilicon mononitride (Si2N); silicon mononitride (SiN), and silicon sesquinitride (Si2N3), each of which are stoichiometric phases. As with other refractories, the products obtained in these high-temperature syntheses depends on the reaction conditions (e.g. time, temperature, and starting materials including the reactants and container materials), as well as the mode of purification. However, the refractory fiber board existence of the sesquinitride has since come into question.
Silicon Nitride Product : Silicon nitride is a chemical compound of silicon and nitrogen. If powdered silicon is heated between 1300 °C and 1400 °C in an atmosphere of nitrogen, trisilicon tetranitride, Si3N4 is formed. The silicon sample weight increases progressively due to the chemical combination of silicon and nitrogen. Without clay insulating bricks an iron catalyst, the reaction is complete after several hours (~7), when no further weight increase due to nitrogen absorption (per gram of silicon) is detected.
The Si3N4 phase is the most chemically inert (being decomposed by dilute HF and hot H2SO4). It is also the most thermodynamically stable of the silicon nitrides. Hence, Si3N4 is the most commercially important of the silicon nitrides and is generally castable refractory material understood as what is being referred to where the term "silicon nitride" is used. Silicon Nitride Product
Silicon Nitride Product : Silicon nitride (i.e. Si3N4) is a hard ceramic having high strength over a broad temperature range, moderate thermal conductivity, low coefficient of thermal expansion, moderately high elastic modulus, and unusually high fracture toughness for a ceramic. This combination of properties leads to excellent thermal shock resistance, ability to withstand high structural loads to high temperature, and superior wear resistance. Silicon nitride is mostly used in high-endurance and high-temperature applications, such as gas turbines, car engine parts, bearings and metal working and cutting tools. Silicon nitride bearings are used in the main engines of the NASA's Space shuttles. Thin silicon nitride films are a popular insulating layer in silicon-based electronics and silicon nitride cantilevers are the sensing parts of atomic force microscopes.
Silicon Nitride Product : Silicon nitride is a chemical compound of silicon and nitrogen. If powdered silicon is heated between 1300 °C and 1400 °C in an atmosphere of nitrogen, trisilicon tetranitride, Si3N4 is formed. The silicon sample weight increases progressively due to the chemical combination of silicon and nitrogen. Without clay insulating bricks an iron catalyst, the reaction is complete after several hours (~7), when no further weight increase due to nitrogen absorption (per gram of silicon) is detected.
The Si3N4 phase is the most chemically inert (being decomposed by dilute HF and hot H2SO4). It is also the most thermodynamically stable of the silicon nitrides. Hence, Si3N4 is the most commercially important of the silicon nitrides and is generally castable refractory material understood as what is being referred to where the term "silicon nitride" is used. Silicon Nitride Product
Silicon Nitride Product : Silicon nitride (i.e. Si3N4) is a hard ceramic having high strength over a broad temperature range, moderate thermal conductivity, low coefficient of thermal expansion, moderately high elastic modulus, and unusually high fracture toughness for a ceramic. This combination of properties leads to excellent thermal shock resistance, ability to withstand high structural loads to high temperature, and superior wear resistance. Silicon nitride is mostly used in high-endurance and high-temperature applications, such as gas turbines, car engine parts, bearings and metal working and cutting tools. Silicon nitride bearings are used in the main engines of the NASA's Space shuttles. Thin silicon nitride films are a popular insulating layer in silicon-based electronics and silicon nitride cantilevers are the sensing parts of atomic force microscopes.
The manufacture of refractories involve the following steps
1. Grinding
Raw materials crushed and refractory castable ground to fine powder using crushers, pulveriser, ball mills.
2. Mixing
In order to alter the chemical properties of the refractories, two or more powdered raw materials are thoroughly mixed with a suitable binding material, which makes moulding easier.
3. Moulding
Moulding can ladle refractory be done either manually or mechanically by application of high pressure.
Hand-moulding produces refractories of low strength and low density. Mechanical-moulding produces refractory brick for sale of high strength and high density
4. Drying
Drying is carried out slowly to the moisture from refractories.
5. Firing
It is done at a temperature as high as or higher than their use temperature . Firing is generally carried out in kilns.
The refractory company refractories are fired,
(i) to stabilize and strengthen their structures.
(ii) to remove water of dration.
(iii) to facilitate development of stable mineral to form the finished products.
Raw materials crushed and refractory castable ground to fine powder using crushers, pulveriser, ball mills.
2. Mixing
In order to alter the chemical properties of the refractories, two or more powdered raw materials are thoroughly mixed with a suitable binding material, which makes moulding easier.
3. Moulding
Moulding can ladle refractory be done either manually or mechanically by application of high pressure.
Hand-moulding produces refractories of low strength and low density. Mechanical-moulding produces refractory brick for sale of high strength and high density
4. Drying
Drying is carried out slowly to the moisture from refractories.
5. Firing
It is done at a temperature as high as or higher than their use temperature . Firing is generally carried out in kilns.
The refractory company refractories are fired,
(i) to stabilize and strengthen their structures.
(ii) to remove water of dration.
(iii) to facilitate development of stable mineral to form the finished products.
2016年4月20日星期三
Introduction and advantages of Chromite Sand
Chromite ore is also called chromite sand which is a kind of special sand for casting. Some natural spinel based mainly on chromite ore, then be crushed, grinded and filtered, thus filter the specified size chromite sand out which can be used as modeling sand.
The main content of chromite sand is Cr2O3. It is characterized with stable heating area, ......
2016年4月18日星期一
What is the Performance Analysis of insulation bricks
Up to 1750 degrees, good thermal stability. Reheating line rate of change is small, the use of more long-term.
2, optimizing the structure, reducing the weight of the furnace:
Now with a high-temperature materials are all heavy brick bulk density of 2.6-3.0g/cm, and insulation Magnesia Carbon Brick only 1.1 ~ 1.5g/cm, the same volume of one cubic meter, alumina hollow ball brick can reduce the weight of 1.1-1.9 tons .
3, saving materials:
Achieve the same temperature, such as the use of heavy bricks and insulation bricks price its price is quite, but also need considerable insulation China refractory material. If insulation Taphole Brick, saving per cubic meter of 1.1-1.9 tons of heavy usage brick, it can save 80% of the fire-resistant insulation materials.
4, save energy:
Thermal insulation characteristics of a good Ladle Magnesia Carbon Brick, low thermal conductivity, can play a very good insulation effect, reduce heat dissipation, improve thermal efficiency and thus serve the purpose of saving energy. Energy savings up to 30%.
Fire Clay Bricks can be used to make high temperature insulation, ultra-high temperature insulation filler, high temperature refractory lightweight aggregate concrete, high temperature castable. To reduce the weight of the furnace, the transformation of the structure, saving material, energy savings will be achieved remarkable results.
Henan Xinmi Changxing Refractory Material Co., Ltd.'s product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc;
订阅：
博文 (Atom)