As one of the raw materials of refractory balls, the firing bauxite plays two roles, one is to improve the refractory degree, the other is to improve the plasticity of refractory balls. The higher the aluminium content, of course, the better, but refractories do not only use bauxite to increase the aluminium content, are using bauxite pyrite and other higher aluminium content of raw materials as a skeleton. So the aluminium content of bauxite need not be too high, more than 38% on the line, viscosity should be considered, the best viscosity point, save extra bentonite.
In general, fire-resistant balls are produced with refined bauxite. It is reported that this refined bauxite is bauxite for a long time to calcine, and then after a multi-level processing made. The characteristics of kaolinite Calcined Bauxite are as follows: kaolinite is crushed to 10-160 meshes, then stirred evenly after adding water, pressed into porous objects, and then roasted. It takes four hours to dry below 400 C, three hours to remove crystalline water at 600 C, and 12 hours to roast at 800 925 C for sufficient oxidation of organic matter. After cooling, it will be grinded to meet the strength requirements. After iron removal, it will become refined bauxite.