Silica Mullite Brick of Furnace Cement

Silica Mullite Brick of Furnace Cement Introduction
 
Refractory silica mullite brick in cement furnace are also called high wear-resistant refractory bricks.Silica mullite brick is a refractory brick made of mullite, andalusite, silicon carbide and special grade alumina. Silica mullite refractory is kneaded, formed by high pressure and then fired at high temperature. The production of silicon carbide mullite from silicon carbide and high alumina bauxite is in line with the development of refractory brick products. Since silicon carbide is oxidized to form silica, Silica mullite refractory bricks reacts with alumina to form mullite (3Al2O3̇2SiO2). Improve the density and strength of the product, form a protective film on the surface of the product to prevent further oxidation of silicon carbide, maintain a certain content of silicon carbide in high aluminum silicon carbide refractory bricks, improve the stability, wear resistance and corrosion resistance of thermal shock products. . Except for the firing zone, the service life of high strength dense silica bricks on cement rotary kiln is 3~4 times that of high alumina bricks.
 
Silica Mullite Brick of Furnace Cement Definition
 
Silica Mullite Brick is also called high wear-resistant refractory brick. Silica Mullite Brick is a refractory brick made of mullite and andalusite, silicon carbide and special graded alumina.  Silica mullite refractory brick is kneaded, high-pressure formed and then fired at high temperature. Silica mullite firebrick has the advantages of high temperature resistance of mullite and wear resistance, corrosion resistance and thermal conductivity of sillimanite.
 
Silica Mullite Brick of Furnace Cement Features
 
1. The structure of the silica mullite refractory product is dense and wear resistant, the main crystal phase of the silicon fired refractory brick is made of high hardness mineral corundum (Mohs hardness 9.0-9.2), silicon carbide (Mohs hardness 9.0-9.5), mullite (Mohs) The hardness is 7.0-7.5). The finished silicon molybdenum structure has high density and the bulk density is generally 2.7-3.0 g/cm3. According to the data reference, the normal temperature wear resistance of the refractory material depends on fire brick strength and compactness of the structure, the refractroy material with high strength and high density has good wear resistance.
 
2.The load softening temperature is high, the high temperature performance is good, the load softening temperature of the silica brick is above 1 450 °C, the highest is above 1 650 °C. Secondly, the thermal shock resistance of the silica brick is good. Since silicon molybdenum contains a certain amount of SiC, Silica mullite firebrick is well known that SiC has high thermal conductivity and relatively small thermal expansion coefficient, Silica mullite refractory bricks significantly improves the thermal shock stability of silicon mullite refractory bricks. The water cooling test at 1100 °C is more than 10 times, so silica mullite refractory as the lining of the kiln, the brick can achieve no flaking, no breakage, and can improve the service life of the kiln.
 
3. Reduce the temperature of the kiln and have good thermal insulation performance.
 
Silica Mullite Brick of Furnace Cement Specification
 

 
Silica Mullite Brick of Furnace Cement Application
 
1. Silica mullite refractory bricks are generally used in cement rotary kiln. Below we analyze the application of silica brick in cement rotary kiln.
 
2. Silica mullite firebricks produced in China has been widely used in the domestic large-scale 2000-10000 t / d large-scale cement rotary kiln. Silica mullite firebrick is understood that some cement rotary kiln kiln bodies are directly combined with magnesium bricks except for the burning belt with a length of about 20m, and refractory castables are used for each of the front and rear kiln mouths of 0.8 m. The rear part of the firing zone, the so-called secondary firing zone,silica mullite refractory bricks is generally the same as the firing zone, and is directly bonded to the magnesium brick, but the kiln skin is difficult to stabilize. Due to the poor thermal shock stability of the magnesium brick, the wear resistance is low, and the joint between the brick and the kiln skin is easy to peel off with the kiln skin, which affects the service life of the segment. However, the Silica mullite firebricks has good thermal shock stability and does not break during use. Exfoliation, erosion resistance, and prolonged service life.
 
3. Silica Mullite Brick surface temperature of the transition zone of cement rotary kiln is about 1400 °C, the temperature of the pre-tropical zone, cooling zone and other parts is lower than that of the transition zone, the firing zone is protected by the kiln skin, and the temperature of the brick surface is not high. The load-softening start temperature of silica mullite brick is above 1500 °C, especially the dense structure of silica brick, composed of high hardness mineral, corundum, silicon carbide, mullite, especially good wear resistance, ideal for transition zone brick. The compressive strength and the softening temperature of refractory silica mullite are significantly higher than those of anti-flaking high alumina bricks. The thermal shock resistance, corrosion resistance, wear resistance and thermal conductivity are not high, silica mullite refractory is required for the process characteristics of the post-transition zone. The service life is 1.5-2 times that of anti-flaking bricks. Good wear resistance is more suitable for cooling belt, the service life can reach more than two years, silica mullite brick is 3-5 times of the life of high alumina refractory brick. Different refractory bricks used in different parts of the cement rotary kiln should be selected according to the working environment of different sections of the rotary kiln.
 
Silica Mullite Brick of Furnace Cement Supplier in RS Refractory Manufacturter
 
Rongsheng refractory castable have rich refractory raw materials and 20 years experienced in the refractory bricks manufacturing. Rongsheng refractory castable can provide specification and category as well as competitive price & high-grade quality refractory castable products.
 
Rongsheng refractory castable factory have any certificate according to client requirement,such as ISO9001 certificate, CE.
 
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