Process for preparing Large ratio surface bata-type aluminium hydroxide

Abstract

A process for preparing beta-aluminum hydroxide with large specific surface area includes such steps as intermittently filling CO2 gas in the solution of sodium aluminate, liquid-solid separation, washing, and baking.

Description

technical field [0001] The invention relates to a method for preparing large specific surface β-type aluminum hydroxide, which belongs to the preparation technology of aluminum hydroxide. Background technique [0002] β-type aluminum hydroxide is mainly used as a catalyst raw material. The larger the specific surface, the larger the specific surface of the catalyst, the larger the contact surface between the catalyst and the catalyzed substance, and the faster the catalytic reaction speed. In production, the amount of catalyst can be reduced, the production cost can be reduced, or the chemical reaction time can be shortened, the production of other substances can be avoided, and the utilization rate of raw materials can be improved. In the case of most catalysts in the same crystal phase, the larger the specific surface, the better. [0003] In relevant domestic patent documents, the Chinese patent application number 90105317.1 proposes a method for producing β-type aluminu...

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Problems solved by technology

[0004] In addition, the Chinese patent application number 00132219.2 proposes a method for producing β-type aluminum hydroxide. The refined solution of sodium aluminate obtained by the soda-lime sintering method has an alumina content of 85-100 g / l, and the solution is caustic. The ratio (αk) is 1.4~1.6, and the carbon dioxide gas with a concentration of 35~40% is passed in at 40~70°C, and the gas flow rate is 100~150m 3 / hour·m 3 solution, the ventilation time is 60-90 minutes, the decomposition rate is 88-90%, and the content of the obtained product β-type aluminum hydroxide is more than 97%, but the specific surface of the product is not very ideal

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