Introduction to Mo Lai Stone Bricks

Mullite brick refers to a high alumina refractory material with mullite as the main crystal phase. The general alumina content is between 65% and 75%. In addition to mullite, minerals with lower alumina content also contain a small amount of glass phase and orthoclase; Those with higher alumina content also contain a small amount of corundum. Mainly used for hot blast stove top, blast furnace body and bottom, glass melting furnace heat storage chamber, ceramic sintering kiln, dead corner lining of petroleum cracking system, etc.
The refractory degree of mullite bricks is relatively high, reaching above 1790 ℃. The starting temperature for load softening is 1600-1700 ℃. The compressive strength at room temperature is 70-260MPa. Good thermal shock resistance. There are two types of bricks: sintered mullite bricks and fused mullite bricks. Sintered mullite bricks are mainly made from high alumina bauxite clinker, with a small amount of clay or raw alumina added as a binder, and are formed and fired. Electric melted mullite bricks are made from high alumina, industrial alumina, and refractory clay as raw materials, with the addition of charcoal or coke particles as reducing agents. After forming, they are manufactured using the reduction electric melting method. The crystallization of fused mullite is larger than that of sintered mullite, and its thermal shock resistance is better than that of sintered products. Their high-temperature performance mainly depends on the content of alumina and the uniformity of the distribution of mullite phase and glass.
With the increasing demand for energy conservation in the world, the development of lightweight insulation materials is rapidly advancing. Lightweight mullite bricks are one of the ideal insulation and refractory materials both domestically and internationally. They have good chemical stability, high temperature resistance, high dimensional accuracy, uniform structure, beautiful appearance, and low thermal conductivity. It is widely used in hot blast stoves, glass crucibles, metal melting furnaces, ceramic tunnel kilns, roller kilns, electric porcelain shuttle kilns, etc., and has broad market prospects. According to the requirements of the special refractory material factory, the lightweight mullite bricks developed and produced by the composite additive burnout method have fine material selection, high operating temperature, direct contact with flames, low production cost, simple manufacturing process, significant energy-saving effect, and product performance and quality basically reach the international advanced level of similar products in the 1990s. Although the development time is relatively short, they have received high praise from many users.