High-purity corundum powder and preparation method thereof

Abstract

The invention relates to a high-purity corundum powder and a preparation method thereof. According to the technical scheme, a corundum block material is subjected to crushing to obtain corundum blockballs with the particle size of 30-50mm and disentegrated particles with the particle size smaller than 30mm; the disentegrated particles are subjected to crushing, and screening and grading to obtaingranular materials I with the particle size larger than or equal to 0.09mm and smaller than 8mm; the granular materials I are subjected to magnetic separation, iron removal, crushing, screening and grading to obtain granular materials II with the particle size larger than or equal to 0.09mm and smaller than 3mm; the granular materials II are subjected to magnetic separation, iron removal, crushing, screening and grading to obtain granular materials III with the particle size larger than or equal to 0.09mm and smaller than 1mm; the granular materials III and the corundum block balls are subjected to magnetic separation and iron removal correspondingly; the granular materials III after iron removal are mill-grinded by the corundum block balls after iron removal and then subjected to hydraulic grading to obtain one-time purified fine powder with the particle size larger than or equal to 0.04mm and smaller than 0.09mm; and the corundum block balls after magnetic separation and iron removal are used as a grinding medium, grinding and pure-water washing are carried out to obtain the high-purity corundum powder. According to the high-purity corundum powder and the preparation method thereof, the production cycle is short, the cost is low, introduction of new impurities is avoided, and produced products are of high purity.

Description

technical field [0001] The invention belongs to the technical field of corundum powder. Specifically, it relates to a high-purity corundum powder and a preparation method thereof. Background technique [0002] There are two main methods for producing corundum: one is the direct method, that is, the natural bauxite is directly fused or sintered into brown corundum, bauxite, sub-white corundum, etc.; the other is the indirect method, that is, bauxite is used first Mine produces industrial alumina, and then fused or sintered alumina is produced into white corundum, dense corundum, tabular corundum, sintered corundum, etc. Therefore, bauxite is an important raw material for the production of corundum. [0003] The impurities in bauxite are SiO 2 , TiO 2 , Fe 2 O 3 , CaO, MgO, K 2 O and Na 2 O et al. Obviously, the total amount of impurities in the corundum produced by the direct method is higher, and the Na in the corundum produced by the indirect method is relatively h...

AI Technical Summary

Problems solved by technology

Since corundum is difficult to dissolve, impurities embedded in the crystal lattice cannot be removed

[0005] The problems of the above method are: 1. It takes a long time to dissolve impurities; 2. Adding acid, alkali and other solutions to introduce new impurities requires secondary removal; 3. Impurities embedded in the crystal lattice cannot be removed