Application method of kiln ash of limekiln to aluminum oxide preparation procedure

Abstract

The invention belongs to the field of preparation of aluminum oxide, relates to kiln ash of limekiln and in particular relates to an application method of the kiln ash of the limekiln to an aluminum oxide preparation procedure. The application method comprises the following effective steps: a, firstly, determining the content of silicon oxide, aluminum sesquioxide and calcium oxide in the kiln ashof the limekiln; b, determining a content ratio of the aluminum sesquioxide to the silicon oxide in ores; c, after mixing the kiln ash of the limekiln and the ores according to the mass ratio of 1 to1, recalculating the content ratio of the aluminum sesquioxide to the silicon oxide and determining an adding amount of lime; d, after sintering is finished, mixing the kiln ash of the limekiln withthe lime according to the content ratio of the aluminum sesquioxide to the silicon oxide and according to the same ratio; after carrying out ashing, obtaining a filter aid. According to the application method provided by the invention, the problem that the utilization value of the existing kiln ash of the limekiln is not high is effectively solved by utilizing a scientific proportion; meanwhile, the kiln ash of the limekiln is used, so that the utilization of the lime is reduced, and furthermore, energy sources are saved and the aim of environment-friendly utilization is realized.

Description

technical field [0001] The invention belongs to the field of alumina preparation, and relates to lime kiln dust, in particular to an application method of lime kiln dust in the process of preparing alumina. Background technique [0002] The methods of industrial production of alumina mainly include Bayer method, sintering method and hybrid method. The Bayer method has the characteristics of simple production process, low energy consumption, low production cost, good product quality and high purity. For economic considerations, the Bayer method or mixed method is generally used to produce alumina for diaspore bauxite. [0003] In the process of producing alumina by the Bayer method, bauxite is added to caustic soda solution, and the alumina in bauxite is dissolved by heating to obtain sodium aluminate solution. Since the bauxite ore used in my country is mainly monohydric Bauxite-type bauxite, therefore, needs to add 3% to 7% lime to dissolve, and then prepare sodium alumina...

AI Technical Summary

Problems solved by technology

[0004] At present, during the firing process of lime, lime kiln dust will be produced. The main components of these lime kiln dust are a large amount of lime powder and a small amount of fly ash. However, lime kiln dust is mainly used in the processing and production of building materials. However, since lime powder and fly ash also contain a certain amount of calcium oxide, and calcium oxide is the main component of lime, and the value of building materials is not high, so how to apply these waste lime powder and fly ash to The preparation of alumina has always been the subject of research on alumina preparation