Ladle Magnesia Carbon Brick
Introduction:
Magnesia Alumina Carbon Brick is formulated for ladle linings and is manufactured with very high purity electro fused Magnesia, high purity Graphite, Alumina and Antioxidants
Advantages:
High purity Alumina and Magnesia thermal shock properties. It has the performance between magnesia carbon brick and alumina magnesia carbon brick
Application:
They are used in Ladle linings, ladle upper and lower slag line, ladle wall and ladle bottom
Content source:
http://www.yilongrefractory.com/AllProductOneServlet?id1=1&id=3
E-mail：sales8@chinaelong.com
2016年12月8日星期四
2016年11月16日星期三
Steel fiber reinforced low cement refractory castable
A heat-resistant steel fiber of a certain size is added to a castable refractories in a mixture consisting of a refractory material aggregate, a binder and an admixture to become
a steel fiber reinforced refractory castable. Compared with castables without heat-resistant steel fireclay refractories, the castable has the following characteristics:
1, can inhibit castable in the curing, baking and high temperature use in the contraction;
2, to improve the toughness of castable, anti-mechanical impact and mechanical strength;
3, to improve the thermal shock resistance of castable;
4, to prevent the cast material generated within the micro-cracks in the thermal stress and mechanical stress under the expansion or extension caused by the occurrence of fracture or peeling.
a steel fiber reinforced refractory castable. Compared with castables without heat-resistant steel fireclay refractories, the castable has the following characteristics:
1, can inhibit castable in the curing, baking and high temperature use in the contraction;
2, to improve the toughness of castable, anti-mechanical impact and mechanical strength;
3, to improve the thermal shock resistance of castable;
4, to prevent the cast material generated within the micro-cracks in the thermal stress and mechanical stress under the expansion or extension caused by the occurrence of fracture or peeling.
2016年11月7日星期一
New requirements of second generation dry process cement for refractory
China's cement industry developed rapidly, the output from the early liberation of the development of 620,000 t in 2015 to 2.35 billion t, from 1985 onwards 31 consecutive years of production and consumption ranked first in the world, the new dry cement production technology and equipment level Has been close to the international advanced level, localization of equipment has been fully meet the needs of the cement industry. However, excess capacity of cement clinker in China, cement companies operating efficiency and low efficiency. Energy saving, reduce costs as a cement enterprise to enhance the economic benefits of the inevitable. China Building Materials Federation first proposed the cement industry should vigorously develop the "second-generation new dry cement technology", its purpose is to reduce the energy consumption of cement production and enhance business efficiency. refractory material as an indispensable lining process of cement sintering material, is the second generation of new dry process cement material support conditions. The second generation of new dry cement technology on the refractory materials put forward new requirements, and refractory configuration technology should also be compatible with.
Cement industry, the initial requirements of refractories materials to meet the protection of the metal shell of a single function; and the development of the second generation of new dry cement technology, requiring refractories with energy saving, green, longevity efficient, safe and stable and other functions .
Energy saving
The second generation of dry cement technology in the cement clinker heat consumption standards for the 650 cal kg-1, and a large part of the calcination process of cement heat through the thermal radiation of the equipment surface dissipation. Therefore, the refractory company material as the basis of all high-temperature equipment lining material, should not only have good performance, but also should take into account the energy-saving insulation properties.
Green
The chromium content in the cement shall not be greater than 10.00 mg kg-1. According to statistics, the water-soluble chromium (Ⅵ) in cement mainly comes from the fuel and raw materials of cement raw materials, crushing and grinding media, refractory materials (magnesia-chrome bricks) and chromium-containing wastes. For most cement companies, refractory high insulating brick (magnesia-chrome brick) is the most important source of water-soluble chromium (Ⅵ). Magnesia-chrome bricks because of good thermal shock resistance, high temperature resistance and hanging kiln skin capacity, is still the majority of domestic cement rotary kiln for the use of high-temperature zone. According to statistics, the domestic cement enterprises average per ton of cement clinker consumption of high-temperature zone with alkaline refractories of about 244 g, assuming that half of the bricks into soluble chromium (Ⅵ) and into the cement clinker, the cement clinker Soluble chromium (Ⅵ) content will reach 10.98mg kg-1. Therefore, in the cement industry to eliminate the use of magnesia-chrome brick has been in the industry consensus, the major domestic basic refractories enterprises have developed alternative to magnesia-chrome brick refractory products used in high-quality, and in the country has been rapidly applied.
Longevity and high efficiency
New dry cement technology continues to move in the direction of large-scale development, the current Nissan 5000t and above cement clinker production line has become the minimum requirements of new projects of cement companies, Nissan 10000t or 1200t cement clinker production line in China has reached more than 10 articles. Large-scale cement production line requires the quality and stability of refractories alumina brick should be a corresponding substantial increase in long-life, high-performance refractories in the country to promote rapidly, the current domestic cement production line refractories have been slowly from the "overhaul a year "To" three years of two overhaul, "the goal of development.
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.
Cement industry, the initial requirements of refractories materials to meet the protection of the metal shell of a single function; and the development of the second generation of new dry cement technology, requiring refractories with energy saving, green, longevity efficient, safe and stable and other functions .
Energy saving
The second generation of dry cement technology in the cement clinker heat consumption standards for the 650 cal kg-1, and a large part of the calcination process of cement heat through the thermal radiation of the equipment surface dissipation. Therefore, the refractory company material as the basis of all high-temperature equipment lining material, should not only have good performance, but also should take into account the energy-saving insulation properties.
Green
The chromium content in the cement shall not be greater than 10.00 mg kg-1. According to statistics, the water-soluble chromium (Ⅵ) in cement mainly comes from the fuel and raw materials of cement raw materials, crushing and grinding media, refractory materials (magnesia-chrome bricks) and chromium-containing wastes. For most cement companies, refractory high insulating brick (magnesia-chrome brick) is the most important source of water-soluble chromium (Ⅵ). Magnesia-chrome bricks because of good thermal shock resistance, high temperature resistance and hanging kiln skin capacity, is still the majority of domestic cement rotary kiln for the use of high-temperature zone. According to statistics, the domestic cement enterprises average per ton of cement clinker consumption of high-temperature zone with alkaline refractories of about 244 g, assuming that half of the bricks into soluble chromium (Ⅵ) and into the cement clinker, the cement clinker Soluble chromium (Ⅵ) content will reach 10.98mg kg-1. Therefore, in the cement industry to eliminate the use of magnesia-chrome brick has been in the industry consensus, the major domestic basic refractories enterprises have developed alternative to magnesia-chrome brick refractory products used in high-quality, and in the country has been rapidly applied.
Longevity and high efficiency
New dry cement technology continues to move in the direction of large-scale development, the current Nissan 5000t and above cement clinker production line has become the minimum requirements of new projects of cement companies, Nissan 10000t or 1200t cement clinker production line in China has reached more than 10 articles. Large-scale cement production line requires the quality and stability of refractories alumina brick should be a corresponding substantial increase in long-life, high-performance refractories in the country to promote rapidly, the current domestic cement production line refractories have been slowly from the "overhaul a year "To" three years of two overhaul, "the goal of development.
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11月4日星期五
Development and Prospect of Refractories
refractory material is a refractory degree of not less than 1580 degrees, a better thermal shock and chemical erosion, low thermal conductivity and low expansion coefficient of inorganic non-metallic materials. Its widely used in iron and steel, glass, cement and other industries. Refractories have their own characteristics have been proven advantages, but its shortcomings and deficiencies are also different. The development of refractories on the whole in the new products, new processes, such as the direction of development trends.
Refractory material firebrick refractory is mainly made of raw materials such as bauxite, dolomite, silica, magnesite, steel fiber and so on. The development of refractories in the national industrial production applications have a pivotal position.
Refractory materials basic refractories according to the product shape and compact degree, a casting method, melt blowing method, sintering method. Sintering method is part of the raw material pre-firing clinker, cracking and screening, and then a certain percentage of mixing with the raw materials, through molding, drying and firing. The purpose of raw materials is to burn the moisture, organic debris and gas burned. Reduce the sintering products shrink to ensure the accuracy of finished size. In order to homogenize the ingredients and particles of the various raw materials and clinker, kneading is carried out while the binder is added to enhance the bonding strength.
Casting method is to mix raw materials through the process of mixing and fine grinding, in high temperature baking, direct casting, cooling crystallization, annealing into products.
The melt blow method is a method in which the ingredients are melted and then sprayed with high pressure air or superheated steam to disperse them into steel fibers or hollow spheres.
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.
Refractory material firebrick refractory is mainly made of raw materials such as bauxite, dolomite, silica, magnesite, steel fiber and so on. The development of refractories in the national industrial production applications have a pivotal position.
Refractory materials basic refractories according to the product shape and compact degree, a casting method, melt blowing method, sintering method. Sintering method is part of the raw material pre-firing clinker, cracking and screening, and then a certain percentage of mixing with the raw materials, through molding, drying and firing. The purpose of raw materials is to burn the moisture, organic debris and gas burned. Reduce the sintering products shrink to ensure the accuracy of finished size. In order to homogenize the ingredients and particles of the various raw materials and clinker, kneading is carried out while the binder is added to enhance the bonding strength.
Casting method is to mix raw materials through the process of mixing and fine grinding, in high temperature baking, direct casting, cooling crystallization, annealing into products.
The melt blow method is a method in which the ingredients are melted and then sprayed with high pressure air or superheated steam to disperse them into steel fibers or hollow spheres.
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10月8日星期六
Selection Method of Refractory Lining for Different Parts of Blast Furnace
In the production process, the refractory lining of the furnace wall by a variety of role and gradually be eroded, so the choice of the various parts of the refractory brick lining should follow the principle is: refractory lining lining with the part of the heat flow intensity corresponds to, To keep the brick under the impact of strong heat flow
Lining to maintain integrity and stability; refractory lining with the part of the erosion mechanism should be corresponding to ease and delay the lining damage rate, to extend the life of blast furnace; try to use the price / performance than the low refractory, the choice of price Relatively low performance and good resistance
Firebrick, should not blindly choose expensive high-grade refractories. Each part of the firebrick lining selection method is:
(1) furnace throat. Mainly into the charge of the impact and wear, the general selection of steel or water-cooled steel bricks.
(2) the upper part of the furnace. This area is prone to carbon deposition reaction area, and alkali metal, zinc vapor erosion is also occurring in the region, together with the decline in charge and rising gas flow erosion and wear, it should be used to resist chemical erosion and abrasion resistance Of the refractory material
Material, the most suitable high-density clay brick, high-density third-class high-alumina brick or phosphoric acid-impregnated clay brick. Modern large-scale blast furnace on the use of thin-walled structure, the commonly used 1 to 3-stage buckle instead of brick wall lining.
(3) in the lower body and furnace waist. The main mechanism of damage is thermal shock, high temperature gas scour, alkaline metal, zinc and carbon analysis, as well as the initial chemical erosion of slag. Brick lining should be used for thermal shock resistance, resistance to early slag erosion and erosion of refractory castable Now at home and abroad
Large blast furnace selection of good performance but expensive silicon carbide brick (silicon nitride combination, self-bonding, combination of SIAL), so that the life of more than 8 years. Practice has proved that even the best refractory used for Blast Furnace is to be eroded, to balance (probably erosion to the original thickness of half
) Can be stable, this time is about 3 years. In fact, the use of good performance of fired aluminum carbon brick (much cheaper), can achieve this goal. So 10003 and below the blast furnace can be used aluminum carbon brick.
(4) furnace belly. The main reason for the damage is the scouring of high temperature gas and the scouring of slag iron. The heat flux of this part is very strong. Any refractories can not be resisted for a long time, mainly in slag skin, so this part need not be selected.
Too expensive refractories. This part of refractory company life is not long (1-2 months is long, short is 2-3 weeks), the general selection of high refractoriness, load softening temperature and high bulk density refractories, such as high alumina brick, aluminum carbon brick Wait.
(5) hearth tuyere area. This site is the only area of the blast furnace oxidation reaction, the resulting high temperature up to 1900 ~ 2400), brick lining by high temperature caused by the destruction of thermal stress, and high temperature gas scouring, slag erosion, alkali metal erosion, cyclic movement coke
Of the erosion and so on. Modern blast furnace are combined brick masonry tuyere area, made of high aluminum, corundum mullite, corundum and silicon nitride silicon carbide, etc., but also useful for hot-pressed carbon block.
(6) hearth bottom and bottom. Blast furnace lining erosion of serious areas, the degree of erosion has always been to determine the basis for the generation of blast furnace life. The early bottom of the furnace because no cooling, mostly using a single ceramic refractories, thermal stress so that masonry cracks, hot metal
Penetration into the seam leaving the furnace floor brick is the main reason for the damage. The use of good bottom structure (ceramic cups, staggered bite, etc.) and cooling, as well as the use of high quality corundum, gray corundum bricks and carbon microporous, hot pressed bricks, greatly prolongs the blast furnace bottom life. but
Is the molten iron on the carbon brick osmotic corrosion, chemical corrosion of alkali bricks on the carbon brick, thermal stress on the destruction of carbon brick, C02 and H20 on the oxidation of carbon brick is still a threat to the hearth, furnace life important factors, and iron The circulation of the molten iron at the time of the movement on the cylinder liner lining the circumference of the machinery
Scouring and erosion are the primary factors of hearth damage.
This part of the refractory using high thermal conductivity, high permeability, high chemical resistance, low porosity, small pore size hot-pressed small carbon bricks, microporous carbon brick, carbon brick and hot-pressed semi-graphite used in ceramics Cups of corundum or gray corundum bricks. In a very long period of time
Time, small and medium-sized blast furnace using electric calcination anthracite made of high quality self-baking carbon block also achieved very good results. But changed to ceramic cup structure, you should not use self-baking carbon block, and use a roasted carbon block. Because the ceramic cup structure on the high-alumina refractory insulation
Self-baking carbon brick loss of self-baking conditions, can not make self-baking carbon brick to form a whole, so there have been several production burnout accident (North Taiwan, etc.).
Tiekou District, poor working conditions, and now the furnace with refractories matched the combination of iron brick masonry, the production of carbon, semi-graphite, mullite and so on.
Lining to maintain integrity and stability; refractory lining with the part of the erosion mechanism should be corresponding to ease and delay the lining damage rate, to extend the life of blast furnace; try to use the price / performance than the low refractory, the choice of price Relatively low performance and good resistance
Firebrick, should not blindly choose expensive high-grade refractories. Each part of the firebrick lining selection method is:
(1) furnace throat. Mainly into the charge of the impact and wear, the general selection of steel or water-cooled steel bricks.
(2) the upper part of the furnace. This area is prone to carbon deposition reaction area, and alkali metal, zinc vapor erosion is also occurring in the region, together with the decline in charge and rising gas flow erosion and wear, it should be used to resist chemical erosion and abrasion resistance Of the refractory material
Material, the most suitable high-density clay brick, high-density third-class high-alumina brick or phosphoric acid-impregnated clay brick. Modern large-scale blast furnace on the use of thin-walled structure, the commonly used 1 to 3-stage buckle instead of brick wall lining.
(3) in the lower body and furnace waist. The main mechanism of damage is thermal shock, high temperature gas scour, alkaline metal, zinc and carbon analysis, as well as the initial chemical erosion of slag. Brick lining should be used for thermal shock resistance, resistance to early slag erosion and erosion of refractory castable Now at home and abroad
Large blast furnace selection of good performance but expensive silicon carbide brick (silicon nitride combination, self-bonding, combination of SIAL), so that the life of more than 8 years. Practice has proved that even the best refractory used for Blast Furnace is to be eroded, to balance (probably erosion to the original thickness of half
) Can be stable, this time is about 3 years. In fact, the use of good performance of fired aluminum carbon brick (much cheaper), can achieve this goal. So 10003 and below the blast furnace can be used aluminum carbon brick.
(4) furnace belly. The main reason for the damage is the scouring of high temperature gas and the scouring of slag iron. The heat flux of this part is very strong. Any refractories can not be resisted for a long time, mainly in slag skin, so this part need not be selected.
Too expensive refractories. This part of refractory company life is not long (1-2 months is long, short is 2-3 weeks), the general selection of high refractoriness, load softening temperature and high bulk density refractories, such as high alumina brick, aluminum carbon brick Wait.
(5) hearth tuyere area. This site is the only area of the blast furnace oxidation reaction, the resulting high temperature up to 1900 ~ 2400), brick lining by high temperature caused by the destruction of thermal stress, and high temperature gas scouring, slag erosion, alkali metal erosion, cyclic movement coke
Of the erosion and so on. Modern blast furnace are combined brick masonry tuyere area, made of high aluminum, corundum mullite, corundum and silicon nitride silicon carbide, etc., but also useful for hot-pressed carbon block.
(6) hearth bottom and bottom. Blast furnace lining erosion of serious areas, the degree of erosion has always been to determine the basis for the generation of blast furnace life. The early bottom of the furnace because no cooling, mostly using a single ceramic refractories, thermal stress so that masonry cracks, hot metal
Penetration into the seam leaving the furnace floor brick is the main reason for the damage. The use of good bottom structure (ceramic cups, staggered bite, etc.) and cooling, as well as the use of high quality corundum, gray corundum bricks and carbon microporous, hot pressed bricks, greatly prolongs the blast furnace bottom life. but
Is the molten iron on the carbon brick osmotic corrosion, chemical corrosion of alkali bricks on the carbon brick, thermal stress on the destruction of carbon brick, C02 and H20 on the oxidation of carbon brick is still a threat to the hearth, furnace life important factors, and iron The circulation of the molten iron at the time of the movement on the cylinder liner lining the circumference of the machinery
Scouring and erosion are the primary factors of hearth damage.
This part of the refractory using high thermal conductivity, high permeability, high chemical resistance, low porosity, small pore size hot-pressed small carbon bricks, microporous carbon brick, carbon brick and hot-pressed semi-graphite used in ceramics Cups of corundum or gray corundum bricks. In a very long period of time
Time, small and medium-sized blast furnace using electric calcination anthracite made of high quality self-baking carbon block also achieved very good results. But changed to ceramic cup structure, you should not use self-baking carbon block, and use a roasted carbon block. Because the ceramic cup structure on the high-alumina refractory insulation
Self-baking carbon brick loss of self-baking conditions, can not make self-baking carbon brick to form a whole, so there have been several production burnout accident (North Taiwan, etc.).
Tiekou District, poor working conditions, and now the furnace with refractories matched the combination of iron brick masonry, the production of carbon, semi-graphite, mullite and so on.
2016年9月23日星期五
Magnesia aluminum refractories is Basic Refractories
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| Ladle Magnesia Carbon Brick are used in Ladle linings, ladle upper and lower slag line, ladle wall and ladle bottom |
Ladle steel industry is an important and indispensable equipment, as ladle lining, several major changes. Used to be traditional by sintering of clay refractory brick and third class alumina brick, the refractory material shows poor chipping resistance and corrosion resistance during use, low life, an average of only 10 times, dried treatment can only reach about 20 times. With the development of steelmaking technology, refining the molten steel to improve the outer retaining ladle lining insulating castable requirements in the early years of the 20th century that is, once the application as a whole
Cast Mg-Al quality ladle lining material. This lining integrity, and significantly improve the service life, but there are baked ladle long time, there are more serious dregs phenomenon for medium and small mills no special equipment most circumstances, unpacking difficult. To compensate for this deficiency, then the successful application of aluminum-magnesia unfired brick. The lining brick building is easy to assemble, baking time is short and easy unpacking, but still easy to kill slag and chipping resistance is poor. On this basis, in order to overcome the problem of aluminum-magnesia unfired brick ladle lining easy cat slag around the corner late he has not developed the aluminum-magnesia carbon brick, replacing the aluminum-magnesia unfired brick. The material combines the properties of aluminum-magnesia material and carbonaceous material. The main advantages of aluminum-magnesia carbon brick does not have: no cracks between the blocks melt loss, has good resistance to thermal shock resistance and slag ability to overcome the structural steel and slag penetration flaking, significantly improved service life and so on. Because the article is not burning or low-temperature firing, save energy, reduce costs, economic efficiency is very obvious, it attracted people's attention.
China advised in the 20th century, it began with bauxite and magnesite (or light burned MgO) magnesia aluminate spinel raw materials research. In recent years, also carried out a series of studies preparation of magnesia spinel products combine technology, achieved a lot, but the performance has been excellent in high purity products suffer from a high degree of firing is very limited. Domestic activity spinel powder was used. The ultra-high temperature firing process overseas (1 850c) down to 1 660C. But for the average coal-fired furnace refractory general terms, it is still difficult to achieve. To this end, the domestic refractory experts and scholars made active magnesia aluminum gum as a binding agent, was studied with the active Mg-Al gum as binding agent and high-purity magnesia carbon brick magnesia brick spinel combination of performance, the use of magnesia aluminum adhesive activity, both make excellent performance products fired at 1 550 ℃, such as the advanced products in firing ordinary refractory kiln plant in Shanghai possible.
Through active lime kiln back to actual production, research and development of magnesia aluminate spinel unfired brick. Use show, developed spinel unburned brick in the active lime kiln firing service life of more than one year. For a long time, directly from the dry combination of MGO brick manufacturers with excellent slag resistance and corrosion resistance, it is used in large alkaline rotary kiln Pu left. Currently the most widely used range of the steel industry, most of the largest refractory Mg - Al system is unshaped refractory, accounting for about 85% of the unshaped refractories of total production, it is widely used in the converter, ladle, iron package, furnace and blast, virtually all metallurgical thermal equipment.
Spinel has a high melting point, small thermal expansion, low thermal stress, thermal vibration stability, and it has a more stable chemical properties of alkaline slag has a strong resistance, aluminum-magnesia do not burn brick core point to be used, is one of the key substances to improve life. Due to the gradual maturity in recent years, synthetic spinel technology, the use of synthetic spinel materials directly produce good ladle brick as possible, so that it can significantly improve the properties.
Quality spinel is one of the key issues related to the inter-spinel bricks can achieve the proper effect. By introducing the screening laboratory tests and related information, the magnesia-rich spinel 20% to 30% of its corrosion resistance, structural spalling resistance and thermal shock properties are better. But ladle conditions are more factors in the production operation, the amount of added spinel requirements should be 30% to 40% is more reasonable. Therefore, in brick-making process, in addition to producing a good artificial spinel added, we must also note the addition of fused magnesia powder and alumina powder, so that the secondary spinel regenerated during use. Thereby improving bricks tomb of quality performance parts for the control of harmful impurities in particular low-melting material was Na20 and K2O content, the choice of raw materials need special attention exhausted.
Spinel (also known as spinel) has the formula MgO-Al2O3, containing Mg0 was 28.3%, Al2O3 71.7%. Spinel is only Mg0-Al2O3 binary system phase diagram of an intermediate compound, melting at 2 135 C.
2016年8月8日星期一
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8月4日星期四
The application and working principle of Sliding Nozzle
Nowadays sliding nozzle systerm is becoming more and more important in the process of melting and be an necessary part for melting. It is the control device of molten steel in casting process, which can precisely adjust the water flow from ladle to tundish, to make the flowing and flowing out of the molten steel can reach a balance, so that the continuous casting operation is easier to control.Because of its good controllability, the sliding gate system can improve the efficiency of steel making and has been developed rapidly. At present, the sliding gate system is widely used in ladle and tundish.
Generally, the sliding nozzle is composed of a driving device, a mechanical part and a refractory material part (i.e. upper and lower slide plate, nozzle). The working principle of the sliding gate is to slide the upper and lower sliding plate brick through the sliding mechanism, thereby driving the opening and closing of the flow steel hole to adjust the flow rate of the molten steel.
As the refractory material and mechanical component of the sliding gate system,in order to obtain a longer service life and stable operating conditions,sliding gate is requested with excellent properties.
Article source：
2016年7月31日星期日
How To Improve The Glass Phase Of Fused Cast AZS Block
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| Changxing Refractory Material |
Iron, titanium, calcium, magnesium and other impurities should be avoided. The impurities can increase the glass phase but reduce the the viscosity of glass phase and pollute the glass melt.
SiO2 and Na2O are the main components tundish well block of the glass phase of fused cast AZS blocks. The content of SiO2 and Na2O is related to the amount of glass phase. Controlling the content of SiO2 and Na2O strictly is the key to ensure the performance of glass phase.
The main composition of Clay, High Alumina insulating bricks fused cast AZS block includes baddeleyite, corundum, a small amount of mullite, glass phase and pores. In order to reduce and eliminate the residual thermal stress, the glass phase is essential for fused cast AZS to act as a buffer for the thermal stress.
However, too much glass phase zirconium sizing nozzle will weaken the corrosion resistance. In the process of corrosion, the glass phase exudes first and be replaced with the high temperature glass melt, which will accelerate the corrosion. Accompanying the exudation of glass phase, bubbles give off, which will contaminate the glass melt.
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.
4 Ways for Fused Cast AZS Casting
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| Changxing Refractory Material |
PT-Normal casting
It adopts general casting coil grout risers and the riser will be removed in the hot state. The shrinkage cavity in refractories brick is located under the casting scar, due to volume shrinkage from liquid-solid transform and rapid solidification of a casting. The feasible limits of cavity can be evaluated and indicated by the volume-weight testing of blocks in-situ according to the technical specifications.
PT fused cast AZS block nozzle refractory is always cheap and used in the areas with no serious corrosion such as top crown, superstructure and feeder channel. The surface with scars should not be used as the working surface.
QX-Tilt casting
In this method, the mold is inclined at an angle. The shrinkage cavity in brick disperses at one end of the brick and a completely dense zone forms at another end. The feasible limits of cavity can be evaluated and indicated by the volume-weight testing of blocks in-situ according to the technical specifications. Meanwhile, blocks which height less than 900mm are not suitable to be manufactured by this process.
QX fused cast AZS block dry vibration mix is generally used in the sidewall of glass furnaces.
ZWS-Reinforced casting
Similar to WS, merely a few shrinkage voids remain in upper part of the body. A little part of the cavity will be remained at the end of the block after the header cutting. Block evaluation in-situ begins from the determination for the feasible size and deepness of cavity remainder at first and then to the volume-weight testing of blocks according to the technical specifications.
ZWS fused cast AZS block is always used in the sidewall of glass furnaces.
WS-Void-free casting
Additional liquid from the header fills sufficiently into a casting and the header is then cut off, so no shrinkage cavity exists in brick body. Block evaluation in-situ includes the refractory fiber felt acceptance or rejection for somewhat trace of cavity remainder which perhaps appeared and the volume-weight testing of blocks according to technical specifications.
WS fused cast AZS block has a wide application in the glass furnaces such as sidewall, tank bottom, feeder channel, doghouse, throat, dam wall, electrode wall and corner wall.
Casting is a manufacturing process by which the melt is poured into a mold to be solidified. Although the process is short, it is a complex process and every step is related to the quality of the final products.
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7月20日星期三
Abvantages Of Corundum Brick in Changxing refractory company
Corundum brick is made of corundum as the main raw material. It contains more than 90% Al2O3. Due to its good stability, good corrosion resistance and excellent wear resistance, it is widely used in the petrochemical industry, metallurgical industry and the lining of coal gasifier, residual oil gasifier, pulp waste gasifier, the carbon black reactor and other industrial furnaces.
The bulk density is related to the particle size, particle distribution and particle shape. Generally, magnesia carbon brick with coarse particles have lower bulk density than those with fine particles. The smaller the gap between the particles, the greater the bulk density of the bricks. Bricks with mixed particles have higher bulk density than those with single particles. The bulk density of corundum brick increases with the density of particles.
Corundum brick has high cold compressive strength , which will directly affect the quality of the bricks. It has high Al2O3 content. The higher the Al2O3 content, the better the refractories performance of the bricks. It has high softening temperature and good high temperature performance. It has good chemical properties and excellent resistance to acid and alkali. It has good thermal shock resistance and high strength.It has wide applications.
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.
our refractory product list:
http://www.yilongrefractory.com/ProductServlet?id=1
The bulk density is related to the particle size, particle distribution and particle shape. Generally, magnesia carbon brick with coarse particles have lower bulk density than those with fine particles. The smaller the gap between the particles, the greater the bulk density of the bricks. Bricks with mixed particles have higher bulk density than those with single particles. The bulk density of corundum brick increases with the density of particles.
Corundum brick has high cold compressive strength , which will directly affect the quality of the bricks. It has high Al2O3 content. The higher the Al2O3 content, the better the refractories performance of the bricks. It has high softening temperature and good high temperature performance. It has good chemical properties and excellent resistance to acid and alkali. It has good thermal shock resistance and high strength.It has wide applications.
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.
our refractory product list:
http://www.yilongrefractory.com/ProductServlet?id=1
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