Factors Affecting the calcination quality of bauxite rotary kiln

Bauxite rotary kiln is an important equipment in bauxite calcination plant, The favorable conditions for the rotation of the rotary kiln ensures that the material is relatively uniform. The quality of bauxite calcined is mainly affected by the operation, the quality of the raw materials and the factors such as mass, fuel and so on in the bauxite calcination plant. It is necessary to know the factors which are important for the calcination efficiency.
1 Operation. Reasonably determine the operating parameters (the amount, speed, flame temperature and length, etc.) of the bauxite kiln. Operating fluctuations will cause the material to be over burning or under burning. In particular, for the high temperature of the raw materials, when the kiln temperature is low, it can not guarantee the quality index requirements
2 The degree of raw materials. The raw material is required to be uniform, too large block is not easy to burn, block too small is easy to be over burning. The thickness of granular segregation has been separated during the movement process of materials in the kiln, The fine material is sandwiched between the material layer, and the coarse material is rolled on the surface of the material layer. Therefore, coarse aggregate heating is better, the calcination temperature is higher; and fine material interlayer center is on the contrary.
3 Classification of raw materials. Staged calcination according to the physical and chemical properties of the raw materials is beneficial to master the regularity of the calcination and the thermal system of the kiln. For example, Al2O3 content fluctuation range in bauxite is large, the sintering temperature has different requirements with different grades.
4 The screening of raw materials before being into the kiln. Raw materials less than 5mm is often with poor quality, It is easy to be a lump of varying sizes in the calcination process, which not only pollute the clinker, but also not easy to choose. And it is easy to cause the knot ring in the kiln, which causes the destruction of thermal system and affects the quality of the kiln, so it must be screened.
5 Fuel. When the pulverized coal is used as fuel, Part of the ash subside to the kiln, which increases the material of the low melting compound. Therefore, it is not conducive to the stability of the thermal system in the kiln, and the fluctuation of the quality of the sintering process is not conducive to the stability of the thermal system in the kiln.
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