Method for preparing aluminum hydroxide and application of combination of methanol and inducer in process for preparing aluminum hydroxide

Abstract

The application relates to a method for preparing aluminum hydroxide by catalytic decomposition of solution of sodium aluminate, which comprises the following steps: combining the solution of sodium aluminate, a catalyst methanol and an inducer, and performing catalytic decomposition on the solution of sodium aluminate to prepare the aluminum hydroxide, wherein the inducer is selected from aluminum oxide, aluminum oxide hydrate and aluminum hydroxide. The application also relates to application of the combination of the catalyst methanol and the inducer in the process of preparing the aluminum hydroxide by the catalytic decomposition of the solution of sodium aluminate, wherein the catalyst methanol and the inducer are simultaneously used for performing catalytic decomposition, and the inducer is selected from the aluminum oxide, the aluminum oxide hydrate and the aluminum hydroxide.

Description

Technical field The present invention relates to a method for preparing aluminum hydroxide. More specifically, the present invention relates to a method for preparing aluminum hydroxide by catalytic decomposition of sodium aluminate solution. The invention also relates to the use of the combination of the catalyst methanol and the inducer in the process of catalytically decomposing the sodium aluminate solution to prepare aluminum hydroxide. Background technique In the traditional production of aluminum hydroxide or alumina, the decomposition process of sodium aluminate solution generally uses a carbonation decomposition process or a seed decomposition process. The carbonation of the sodium aluminate solution is achieved by introducing carbon dioxide into the sodium aluminate solution. Its advantage is that the decomposition rate can reach about 90%; its disadvantage is that it needs to prepare lime and carbon dioxide, which requires high sodium aluminate solution, and the si...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the decomposition temperature conditions are harsh, the decomposition time is long, and the decomposition rate is low.

In this method, no catalyst is added during the decomposition process, and additives such as phosphorus pentoxide are only added when product particle size control is required, and its additives cannot be recycled and reused

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