Synthesis of mullite

Synthesis of mullite raw refractory material preparation is divided into dry and wet. The main rotary kiln and tunnel kiln. Dry process is the batch mixture into the ball mill or a mixing machine to mix together, after the ball or compacting pressure with rotary kiln or tunnel kiln firing; wet process is will cooperate with material and water of wet ball mill are added and mixed grinding, press mud into the mud cake, by vacuum extrusion molding machine squeeze into mud or clay were used for calcination in rotary kiln or tunnel kiln.

Wet process of Mo normal synthetic mullite billet temperature lower reaction is complete, mullite content is high, good uniformity; tunnel kiln to calcine to control mo mullite clinker microstructure and crystal growth.

General Low aluminum mullite and alumina mullite can be obtained by single natural raw materials direct calcination, such as calcined kaolin and calcined kyanite, etc., ingredients and production process is relatively simple. Kyanite as raw material, because of Kyanite in the heat expansion is bigger, is not easy to get the dense clinker, usually need to first part of calcined kyanite (1500-1550 DEG C), and then crushed, add 25% – 30% of the refractory clay. If the kyanite calcined beforehand, the kyanite in ball mill for fine grinding to reduce the calcination of expansion, usually by adding 10-%35% plastic clay as binder, calcination temperature not less than 1380 DEG C.