Effect of Additives on Product Properties. At lower temperatures can significantly promote the Cr2O3 material sintering, refractory castable access to physical and chemical indicators to achieve or exceed the advanced products of similar products. In order to be able to fully crush Cr2O3 at lower temperatures, two techniques have been taken: (1) to improve Cr2O3 fineness as much as possible without affecting the yield of the product. (2) the introduction Refractory company of the ion radius and Cr3 + radius of the similar additives, so that in the appropriate (2) the introduction of the ion radius and Cr3 + radius of the additive, so that the greater the size of the grain, the greater the degree of distortion and radius of curvature of the grain, the higher the activity of the insulation products material, Oxygen partial pressure range sintering to form continuous solid solution and finite solid solution, destroying the ordered arrangement of Cr atoms, leading to the introduction of atomic potential around the change, resulting in Cr2O3 crystal periodic potential field distortion, accelerate the self-diffusion rate of chromium ions, Promote the sintering of Cr2O3 material.
2017年4月5日星期三
Research on Burning Process of Refractory Brick
The components of the additive are compatible with the glass components and can react with the Cr2O3 at the same time to refractory brick promote the thermal defects in the interior and the surface of the Cr2O3 crystal and the Schottky thermal deformation in the heated state. , To accelerate the process of mass diffusion and surface diffusion of the material firebrick refractory during firing. Some of the components in the additive react with Cr2O3 to form a solid solution, which is crystallized from the melt and deposited at the grain boundaries of the Cr2O3 grains to form a ring crystal band to control the growth of the Cr2O3 grains and to strengthen the intergranular phase Combined to improve the strength of the product. Based on the above considerations, a number of additives were selected for the experimental study, where two representative additives were screened for comparison, one for additive A and the other for additive B.
Effect of Additives on Product Properties. At lower temperatures can significantly promote the Cr2O3 material sintering, refractory castable access to physical and chemical indicators to achieve or exceed the advanced products of similar products. In order to be able to fully crush Cr2O3 at lower temperatures, two techniques have been taken: (1) to improve Cr2O3 fineness as much as possible without affecting the yield of the product. (2) the introduction Refractory company of the ion radius and Cr3 + radius of the similar additives, so that in the appropriate (2) the introduction of the ion radius and Cr3 + radius of the additive, so that the greater the size of the grain, the greater the degree of distortion and radius of curvature of the grain, the higher the activity of the insulation products material, Oxygen partial pressure range sintering to form continuous solid solution and finite solid solution, destroying the ordered arrangement of Cr atoms, leading to the introduction of atomic potential around the change, resulting in Cr2O3 crystal periodic potential field distortion, accelerate the self-diffusion rate of chromium ions, Promote the sintering of Cr2O3 material.
Effect of Additives on Product Properties. At lower temperatures can significantly promote the Cr2O3 material sintering, refractory castable access to physical and chemical indicators to achieve or exceed the advanced products of similar products. In order to be able to fully crush Cr2O3 at lower temperatures, two techniques have been taken: (1) to improve Cr2O3 fineness as much as possible without affecting the yield of the product. (2) the introduction Refractory company of the ion radius and Cr3 + radius of the similar additives, so that in the appropriate (2) the introduction of the ion radius and Cr3 + radius of the additive, so that the greater the size of the grain, the greater the degree of distortion and radius of curvature of the grain, the higher the activity of the insulation products material, Oxygen partial pressure range sintering to form continuous solid solution and finite solid solution, destroying the ordered arrangement of Cr atoms, leading to the introduction of atomic potential around the change, resulting in Cr2O3 crystal periodic potential field distortion, accelerate the self-diffusion rate of chromium ions, Promote the sintering of Cr2O3 material.
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6月5日星期日
Chemical composition of fire clay bricks
 |
| The use of the bricks can reduce the heat capacity of kiln walls and promote the heat efficiency of kilns. The product is applicable for constructing industrial kilns and inner lining of kilns. |
The main raw material is firebrick refractory clay. Clay is an earthy mineral. It can form plastic mud pie when mixed with water and maintain the shape after drying. It has rock-like hardness after fired at high temperature.
Additionally, the clay contains a certain amount of impurities such as quartz, mica, pyrite, feldspar and organic substances. The impurities, especially iron, can reduce the quality of clay refractory brick for sale and are harmful to the fire clay bricks.
Alkalis such as Na2O and K2O exist as mica. It can improve the sintering properties of clay and form dense products after sintered. It should be fewer than 2%.
The content of CaO is generally ladle refractory under 11.5% and distributed evenly. So, it will not affect the refractory properties of raw materials.
There is a certain amount of TiO2 in the bond clay. It exists as diamond. When it is less than 1%, it has no big effect on the quality of bond clay. In the chemical analysis, its content is not tested alone but counted in the content of A1203 + TiO2.
When the impurities in the clay exceed 6%, the refractories of clay will decease and cannot be used as the raw materials. The content of organic substances in the clay is fluctuated greatly, up to 5%.
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:
Application of monolithic refractories on industrial furnaces
2016年6月1日星期三
Refractories for cement industry
Alkaline Refractories
Alkaline refractory material is available for high temperature calcination, also has superior chemical resistance property, which is a main refractory material for cement kiln to keep high production quality, high yield, low consumption and long-term safe operation. Currently main material for cement kilns include direct-bonded magnesia chrome brick, semi-direct bonded magnesia chrome brick, ordinary magnesia chrome brick , dolomite brick, zirconium and zirconium-free special magnesite brick, spinel brick and chemically bonded unburned magnesia chrome brick.
Alkaline refractory material is available for high temperature calcination, also has superior chemical resistance property, which is a main refractory material for cement kiln to keep high production quality, high yield, low consumption and long-term safe operation. Currently main material for cement kilns include direct-bonded magnesia chrome brick, semi-direct bonded magnesia chrome brick, ordinary magnesia chrome brick , dolomite brick, zirconium and zirconium-free special magnesite brick, spinel brick and chemically bonded unburned magnesia chrome brick.
Bricks properties are listed as follows:
High alumina brickHigh alumina brick has high compressive high insulating brick strength, high refractoriness under load and good thermal shock resistance. Because of its low cost with high quality, it is widely used in varieties of cement kilns. When to be used in arch crown, calcined alumina brick is better. High alumina bricks suitable for cement kilns include phosphate bonded alumina brick, phosphate bonded high alumina wear-resistant brick, anti-stripping alumina brick, chemically bound (special) castable refractory material alumina brick and general alumina brick and so on.
High alumina brickHigh alumina brick has high compressive high insulating brick strength, high refractoriness under load and good thermal shock resistance. Because of its low cost with high quality, it is widely used in varieties of cement kilns. When to be used in arch crown, calcined alumina brick is better. High alumina bricks suitable for cement kilns include phosphate bonded alumina brick, phosphate bonded high alumina wear-resistant brick, anti-stripping alumina brick, chemically bound (special) castable refractory material alumina brick and general alumina brick and so on.
Alkali Brick Series
Alkali brick has excellent alkali corrosion performance, under certain conditions, it will react with the alkali compound kiln materials and kiln gas, rapidl. yclay insulating bricks forming enclosed type dense protective enamel layer on the turn, preventing the continuing internal mixing and bricks "base crack ", which is a indispensable kiln lining material in NSP kiln. This series bricks include ordinary alkali-resistant brick, high-strength alkali-resistant brick, insulation alkali-resistant brick and arch type alkali-resistant brick.
Alkali brick has excellent alkali corrosion performance, under certain conditions, it will react with the alkali compound kiln materials and kiln gas, rapidl. yclay insulating bricks forming enclosed type dense protective enamel layer on the turn, preventing the continuing internal mixing and bricks "base crack ", which is a indispensable kiln lining material in NSP kiln. This series bricks include ordinary alkali-resistant brick, high-strength alkali-resistant brick, insulation alkali-resistant brick and arch type alkali-resistant brick.
Series refractory castables
Refractory castables can be produced with simple production process, which is flexible and convenient to be used in the cement kiln system. It has become increasingly common to be applied in the complex structure of cement kiln preheater system. Refractory castables suitable for cement kiln mainly include corundum castable, high alumina castable, alkali-resistant castables and light weight castable.
Refractory castables can be produced with simple production process, which is flexible and convenient to be used in the cement kiln system. It has become increasingly common to be applied in the complex structure of cement kiln preheater system. Refractory castables suitable for cement kiln mainly include corundum castable, high alumina castable, alkali-resistant castables and light weight castable.
article source:
nest article:
订阅：
博文 (Atom)