New process for producing aluminum and silicon chemical products by low-grade bauxite or kaolin raw material based on alkaline method

Abstract

The invention belongs to the field of comprehensive utilization of a low-grade bauxite or kaolin (siallitic soil) raw material, and in particular relates to processes such as wet-method alkalinizing calcination, separation of aluminum and silicon compounds and the like. The process comprises the following steps: mixing the ground siallitic soil raw material with a proper amount of strong alkali and water, drying and performing calcined activation; grinding the calcined material, and then adding the ground material and a proper amount of water into a reaction tank (reaction kettle) so as to bedissolved into NaAlO2 and Na2SiO3 solutions as well as a small amount of solid at a proper temperature within a period of time; filtering, separating and adjusting the pH value so as to separate out Al(OH)3 and H2SiO3; and filtering and adjusting the pH value once again so as to separate out AlCl3 and H2SiO3, wherein, the AlCl3 is used for synthesizing aluminium polychloride and the H2SiO3 is used for producing white carbon black. The process provided by the invention has the beneficial effects that the dissolution efficiency of the raw material can be obviously improved, the whiteness and yield of the aluminium polychloride are increased, the high-value white carbon black can be produced, and the heat consumption is lowered, thus achieving great economical and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of low-grade bauxite or kaolin raw materials, and in particular relates to a process for producing aluminum and silicon chemical products from low-grade bauxite or kaolin activated by wet-alkali-calcination. Background technique [0002] my country is very rich in kaolin resources. At present, there are more than 700 kaolin mines, and the proven reserves of 200 mines are more than 3 billion tons. Among them, 1.67 billion tons of coal series kaolin and 1.432 billion tons of non-coal series kaolin. Although there are many kaolin resources in my country, there are few reserves of high-quality kaolin and the price is expensive. Most of them are coal series kaolin (rarely in foreign countries) with poor quality. They are mostly used in the production of low value-added ceramics, bricks, cement, etc., and some Used in the production of polyaluminum chloride products. [0003] Polyalum...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to propose a process for the alkaline production of aluminum and silicon chemical products with low-grade bauxite or kaolin raw materials, mainly producing chemical products such as polyaluminum chloride and white carbon black, so as to solve the problems in the production of existing processes. Bauxite only produces polyaluminum chloride, and the polyaluminum chloride produced has problems such as poor whiteness, low quality, low utilization rate of main components, and large waste slag discharge.

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