There are two main types of production methods for mullite bricks: sintering synthesis of mullite bricks and electric melting of mullite bricks. The production methods, performance, and quality of these two types of mullite bricks are different. Below, we will introduce the production process and performance of mullite bricks:
1. Production process of sintered mullite bricks
The production process of sintered mullite bricks is the same as that of high alumina bricks. It mainly uses synthetic mullite clinker as granular material; And sometimes synthetic mullite clinker is used for fine powder, or a mixed powder composed of white corundum, quartz powder, and pure clay, which is equivalent to the composition of quartz. Mix the granular material and fine powder in proportion. The commonly used ratio is: granular material 45%~55%, fine powder (<0.088mm) 55%~45%. After uniform mixing, high-pressure forming is carried out. The firing temperature is 1550-1600 ℃. When using electric melting to synthesize mullite, the clinker is a granular material, and its firing temperature should be greater than 1700 ℃. The purity, fineness, and calcination temperature of the raw materials are extremely important process factors that affect brick formation.
2. The performance of mullite bricks
The properties of mullite bricks are mainly determined by the properties of mullite. It has high fire resistance, high load softening temperature, low high-temperature creep rate, excellent thermal vibration resistance, slag erosion resistance, high shear modulus, etc. Molonite refractory bricks have a wide range of applications, mainly used for high-temperature hot blast furnaces, large blast furnace hearths and bottoms, steelmaking electric furnace tops, ceramic industrial kiln linings, kiln equipment, as well as glass and cement kiln linings.
The sintered mullite bricks produced from sintered synthesized mullite as raw material have good corrosion resistance and impact resistance, and have achieved satisfactory application results within a certain range.
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