For enterprises with unstable physical and chemical indexes, non-standard management system and low technical capacity, in order to stabilize production and improve product grade, it is better to adopt homogeneous bauxite calcination technology, that is, through homogenizing process and appropriate calcination temperature system, to produce products with stable composition, uniform structure and stable performance. Homogenization process includes homogenization of mineral raw materials, blending materials, raw material grinding, homogenization of pulp raw materials stale, pressure filtration dehydration or drying dehydration, artificial ball formation, ball drying and other processes.
For soillike raw materials, or hardness, strength is not enough stone raw materials, also need to match with other compounds, ball grinding pulping, homogenizing stale, pressure filtration dehydration or drying dehydration, artificial ball, ball drying and other processes. For the content of aluminum is not high, more impurities of the ore, also need to carry out artificial picking, desilication, decalcification, iron and other production processes. Particle size is also a key point of production stability, the formulation of raw material manual selection, primary washing, crushing, screening, secondary washing, drying, preheating and predecomposition technology is the key to ensure the size and particle distribution of raw materials. Raw materials mined in mines can not avoid impurities such as loess and limestone.
Artificial selection and one-time washing can remove impurities. Crushing and screening can ensure the granularity and grading of raw materials. Preheating and predecomposition to ensure the dehydration of the ore, the main mineral composition of bauxite is a hydrobauxite, it in 580 ~ 600° between a dehydration and heat absorption valley, dehydrated bauxite ore into the rotary kiln there is no problem of continued dehydration, shorten the production cycle, also avoid the material dehydration of raw material ring and bauxite ore blast kiln, kiln can not guarantee the granularity, Nor can it guarantee the safety and stability of production. The calcination of bauxite actually completes the transformation process from bauxite to corundum clinker. Reasonable calcination process can improve the conversion of α-Al2O3, improve the density of calcined material, reduce the apparent porosity and water absorption of calcined material, and shorten the firing cycle of corundum grinding materials or refractory materials.
At the same time, with the national requirements for energy conservation and environmental protection and the market requirements for the application of corundum materials, it is also essential to choose advanced energy conservation and emission reduction technology and deep processing technology of calcined materials. Technology is everywhere, technology research is endless, we must constantly study new technology, solve new problems, in order to solve the problem of production, break through the bottleneck of production technology.
