Method for efficient and fast desilication of bauxite

Abstract

The invention belongs to the technical field of bauxite desilication and particularly discloses a method for efficient and fast desilication of bauxite. The method for efficient and fast desilication of bauxite includes the steps that bauxite and alkali liquor are mixed and prepared into reaction slurry, the liquid-to-solid ratio of the reaction slurry is 2-50, the reaction slurry reacts in a microwave reactor so that silicon can be dissolved out, reaction temperature is 10-130 DEG C, reaction time is 2-220 min, reaction liquid is subjected to solid and liquid separation after the reaction ends, an obtained liquid phase is a silicon-containing solution, and the SiO2 content in the silicon-containing solution is 0.3-50 g / L. According to the method for efficient and fast desilication of bauxite, reaction is performed in the microwave reactor for desilication, and the purpose of efficiently dissolving out silicon in bauxite is achieved in a short time by determining the liquid-to-solid ratio of the reaction slurry, the reaction temperature and the reaction time. Silicon minerals in bauxite are purified and recycled, no red mud enters the silicon minerals, and therefore the production amount of red mud in alumina production is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of bauxite desiliconization, in particular to a method for high-efficiency and rapid desilication of bauxite. Background technique [0002] The traditional production process of alumina production from bauxite is mainly Bayer method, sintering method and so on. So far, 90% of the world's aluminum companies are using the Bayer process. The Bayer method includes two main processes, that is, two patents proposed by Bayer. One is that he found that the sodium aluminate solution with a molar ratio of sodium oxide to aluminum oxide of 1.8 can With continuous stirring, the aluminum oxide in the solution can be slowly precipitated in the form of aluminum hydroxide until the molar ratio of sodium oxide to aluminum oxide is increased to 6, most of the aluminum hydroxide has been precipitated, and the remaining solution can be dissolved when heated. Alumina hydrate in bauxite is also the process of dissolving bauxite...

AI Technical Summary

Problems solved by technology

The disadvantage is that the concentration of lye used is high, and the dissolution time is long, which takes 5 to 10 hours

[0006] Looking back at the whole process and development process of alumina, it can be seen that alumina production is mainly divided into: dissolution process, decomposition process and evaporation process, each of which accounts for about 1 / 3 of the cost, and the processes of decomposition process and evaporation process are basically stable and mature , but the dissolution process and red mud properties have been changing with the properties of ore and processing methods, and in order to reduce the impact of silicon minerals, research has not stopped

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