Last issue we mainly introduced 6 characteristics of mullite lightweight insulating fire brick. This issue we will continue to introduce production process of mullite light weight insulating fire brick.
According to its production process, mullite insulation bricks are currently classified into sintered mullite bricks and electric melting mullite bricks:
1. The sintered mullite brick is made of high alumina bauxite clinker as a main raw material, and a small amount of clay or raw bauxite is added as a binder.Through molding and firing the bricks are formed.
2. The electric melting mullite brick is made of high alumina bauxite, industrial alumina and refractory clay as main raw material, and is added with fine charcoal or coke particles as a reducing agent. After molding, the bricks are formed by reduction electrofusion.
Comparing the mullite insulation bricks produced by these two methods, the electric melting mullite bricks have larger crystals than sintered mullite bricks, and have better thermal shock resistance than sintered products. Their high temperature performance is mainly determined by the alumina content and the uniformity of the distribution of mullite phase and glass phase. They are mainly used in hot blast stove, blast furnace body and bottom, regenerator of glass melting furnace, ceramic sintering kiln, oil cracking system dead angle lining, etc.
Therefore, when choosing mullite insulation bricks, we also need to consider the cost performance of sintered mullite bricks and electric melting mullite bricks, and use mullite insulation bricks according to the specific kiln conditions.