Clay bricks
1.Composition and manufacturing
Clay bricks are made of 50% soft clay and 50% hard clay clinker according to certain particle size requirements. After molding and drying, they are fired at a high temperature of 1300~1400℃.
It belongs to the silicon-aluminum series products, and is a refractory product with an Al2O3 content of 30-48% made of clay clinker as aggregate and refractory clay as binder.
2.Performance
Clay bricks are weakly acidic refractory products, which can resist the erosion of acidic slag and acidic gas, and have a slightly poor resistance to alkaline substances.
It has good thermal properties and is resistant to rapid cooling and heating.
In the temperature range of 0~1000℃, the volume of clay bricks expands evenly with the increase of temperature, and the linear expansion curve is close to a straight line, with a linear expansion rate of 0.6%~0.7%.
When the temperature exceeds 1200℃, the low-melting-point substances in the clay bricks gradually melt, resulting in volume shrinkage.
3.Application
It is widely used in thermal boilers, glass kilns, cement kilns, fertilizer gasification furnaces, blast furnaces, hot air furnaces, coking furnaces, electric furnaces, bricks for casting and steel pouring, etc. in the fields of metallurgy, building materials, chemicals, petroleum, machinery manufacturing, silicates, power, etc.
Clay brick VS Mullite brick
Mullite Brick
1.Composition and Manufacturing
Mullite brick is an insulation brick with mullite as the main raw material, and the general alumina content is between 45% and 65%.
It can be divided into sintered mullite brick and fused mullite brick. Sintered mullite brick is made of high-alumina bauxite clinker as raw material, a small amount of clay or raw bauxite as binder, and is formed and fired. Fused mullite brick is made of high-alumina bauxite, industrial alumina and refractory clay as raw materials, charcoal or coke fine particles are added as reducing agent, and it is made by reduction electric melting after forming.
2.Performance
Mullite brick has the characteristics of low heat melting and low thermal conductivity, accumulates very little heat energy, and has obvious energy-saving effect in intermittent kilns.
It has the characteristics of high strength, corrosion resistance, low heat capacity, low shrinkage, high insulation and high refractoriness.
The crystallization of fused mullite is larger than that of sintered mullite, and its thermal shock resistance is better than that of sintered products.
3.Application
Mainly used for hot blast furnace top, blast furnace body and furnace bottom, glass kiln heat storage room, ceramic sintering kiln, dead corner lining of petroleum cracking system, etc.
Suitable for various industrial furnace hot face villages and back villages in metallurgy, petrochemical, building materials, ceramics, machinery and other industries.
Comparison summary
Composition and manufacturing: Clay bricks are mainly made of soft and hard clay, while mullite bricks are made of mullite as the main raw material with a high content of alumina.
Performance: Both have good refractory properties, but mullite bricks perform better in thermal shock resistance, low thermal melting and low thermal conductivity.
Application: Both clay bricks and mullite bricks are widely used, but mullite bricks are more suitable for use in high temperature and energy-saving environments.