Bauxite coarse-fine separation grinding method

Abstract

The invention provides a bauxite coarse-fine separation grinding method, and a fine screen is employed as pre-grading equipment before bauxite is ground. The screen size of the fine screen is less than 1.5 mm, and the solid content of a mixed ore pulp before entering the screen is 400 g / L. After the mixed bauxite pulp passes through the fine screen, pulp with qualified granularity and coarse-grain ore are effectively separated, coarse-grain bauxite enters a mill, the screened fine-grain pulp is directly sent to a next process, and over-grinding phenomenon caused by bauxite with qualified granularity entering the mill is prevented. The ore on the screen enters the mill and is subjected to closed circuit grinding under the effect of the mill and a hydrocyclone. Ore pulp overflowed from the hydrocylcone is taken as qualified ore pulp and is merged with the ore pulp under the screen, and the obtained mixed ore pulp is sent to the next process. The method is capable of effectively reducing bauxite over-grinding phenomenon, the mill grinding amount can be reduced by about 50%, energy consumption is reduced by about 35%, and good economic benefit is provided.

Description

technical field [0001] The invention relates to a grinding process method for bauxite, in particular to a grinding process method for separating coarse and fine bauxite, and belongs to the technical field of alumina production. Background technique [0002] Bauxite is the most important raw material for the production of alumina. my country's bauxite resources are mainly diaspore. The ore is shallowly buried, fully weathered, mostly soil-like, and occasionally large ore. [0003] The particle size analysis results of bauxite in the homogenization yard area of ​​an alumina plant in Henan Province are shown in the following table: [0004] Table 1 Grain size distribution of raw ore in a homogenization yard of an alumina plant in Henan [0005] [0006] From the table, we can find that the ore with a particle size of less than 1mm accounts for 50% of the total. [0007] The bauxite mined from the mine is crushed and screened, and then sent to the homogenization yard for s...

AI Technical Summary

Problems solved by technology

Combining the above table, it can be seen that in the conventional grinding process, a large amount of qualified ore is sent into the mill, resulting in overgrinding of the ore

This extensive production method not only causes waste of mill capacity and consumes a lot of electricity, but also reduces the sedimentation performance of red mud, which has a negative impact on subsequent production

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