Raw meal preparation process and system for dry sintering to produce alumina clinker

Abstract

The present invention discloses a preparation process for raw material used for dry-process sintering production of aluminum oxide clinker. The preparation process comprises: after metering limestone in proportion, feeding the limestone to a vertical mill; after grinding and carrying out powder selecting by virtue of the vertical mill, feeding qualified limestone powder to a gas-solid separator I; and after the gas-solid separator I collects the qualified limestone powder, feeding the qualified limestone powder to a material-mixing device; after metering nepheline and albic powder in ratio, feeding the nepheline and albic powder into a ball mill; after grinding, feeding the nepheline and albic powder to a powder concentrator by virtue of wind to perform grading; after grading, feeding qualified nepheline and albic powder to a gas-solid separator II for collecting, feeding thenepheline and albic powder into the material-mixing device; and and after limestone powder materials are mixed with the nepheline and the albic powder material in the material-mixing device, taking the mixture as a raw material finished product and feeding the raw material finished product into a homogenizing silo. The present invention further discloses a raw material preparation system applying the process. According to the preparation process, grinding is performed on the limestone and the nepheline separately by use of different grinding systems and equipment, and qualified products are acquired after being mixed and homogenized, so that product particles are distributed reasonably, and the raw material grinding system is low in power consumption.

Description

technical field [0001] The invention belongs to the technical field of dry sintering to produce alumina clinker, in particular to a raw material preparation process and system for dry sintering to produce alumina clinker. Background technique [0002] At present, there is no domestic factory using nepheline dry sintering to produce alumina. Most new domestic alumina projects are produced by the Bayer method, which has high requirements on the quality of bauxite, which has exacerbated the tension in the supply of high-quality bauxite. At this rate of development, it is estimated that domestic bauxite mines can only be mined for 10 years. Even if all the resources with an aluminum-silicon ratio greater than 5 are fully utilized, the guarantee period is only 20 years, which is far from the foreign standard of 50 years for safe mine supply. far. [0003] Today, my country's bauxite resources are in short supply, while nepheline resources have not yet been developed and utilize...

AI Technical Summary

Problems solved by technology

[0005] If during mixing and grinding, the fineness of the raw material is controlled too finely to solve the subsequent sintering problem caused by unreasonable particle size distribution, the power consumption of the grinding system will be too high, the selection of the main machine is too large, the investment cost is too high, and the production high operating costs

Images