Mullite is a high-quality refractory material, which has the characteristics of uniform expansion, excellent thermal shock stability, high load softening point, low high temperature creep value, high hardness, and good chemical corrosion resistance. At present, mullite is mainly prepared by artificial synthesis. The researchers discovered that coal gangue, a by-product of coal production, can be used to make mullite. Utilizing coal gangue to prepare mullite, on the one hand, solves the problems of resource waste and environmental pollution caused by coal gangue stacking. On the other hand, it also solves the problems of high cost and high energy consumption in the production of mullite from kaolin. Guilin Hongcheng, as a manufacturer of coal gangue pulverizers, will introduce to you today the production of refractory mullite from coal gangue.
The main method of existing mullite is the sintering method, specifically adding an appropriate amount of alumina to pulverized kaolin, followed by mixing, molding, and sintering to obtain mullite. This process has the problems of high cost and high energy consumption, so it cannot be widely used. The chemical composition of coal gangue mainly includes Al2Oz.Si02, Fe2O2.CaO and trace rare elements, which are similar to the chemical composition of mullite. Therefore, it can be processed as a raw material for the preparation of mullite and realize solid Recycling of waste to reduce production costs. The production method is as follows: coal gangue and alunite are pulverized by a coal gangue mill and mixed for the first calcination; then dolomite is added for the second calcination; finally barium sulfate is added for the third calcination to obtain Mullite.
Coal gangue production of high-grade refractory mullite is inseparable from the help of coal gangue pulverizer. Because in the mixing step of the first step, the particle size of raw coal gangue needs to be crushed to 100-300 mesh, and the particle size of alunite is crushed to 200-300 mesh. Ordinary crushers cannot achieve this particle size crushing, and it needs to be realized by coal gangue Raymond mill or coal gangue vertical mill. Guilin Hongcheng is a manufacturer of coal gangue pulverizers. The coal gangue Raymond mills and coal gangue vertical mills we produce have been widely used in the market. We have rich experience in coal gangue milling and have also had success in the refractory market. Operation case, if you have coal gangue pulverization needs, please leave us a message to learn more about the equipment.