Crystal growth substance for decomposition of sodium aluminate solution

Abstract

The invention relates to a crystal growth substance for decomposition of sodium aluminate solution, which applies to the decomposition process of sodium aluminate solution during alumina production. The substance is characterized in that the crystal growth substance is concentrated water serving as a byproduct produced through reverse osmosis in a natural water softening process and has electrical conductivity between 1,500 and 3,000 mu s/cm. The crystal growth substance for decomposition of sodium aluminate solution reacts with sodium aluminate solution to form floc which is large in specific surface area and strong in adsorption capacity, adsorbs and decomposes aluminum hydroxide particles in slurry and allows aluminum hydroxide to agglomerate and grow up. The concentrated water serving as the byproduct produced through reverse osmosis in the natural water softening process can be a byproduct of the prior chemical production. Due to the low cost of the concentrated water serving as the byproduct produced through reverse osmosis in the natural water softening process, the cost for domestic or imported crystal growth substances added in the decomposition of sodium aluminate solution in the prior art is reduced; benefit is increased; and the granularity of the product is improved.

Description

technical field [0001] The invention relates to a sodium aluminate solution decomposition crystal growth agent, which is suitable for the sodium aluminate solution decomposition process in the alumina production process. Background technique [0002] At present, the vast majority of alumina production in foreign countries is based on the Bayer process of gibbsite and boehmite as raw materials. my country's alumina production mainly uses insoluble diaspore bauxite as raw material, and the products are mostly powdery and intermediate alumina, with poor particle size and strength indicators. The production of electrolytic aluminum requires alumina products with good fluidity and small flyover as raw materials. In order to enhance the competitiveness of my country's alumina industry in the market, it is necessary to improve the particle size and strength of the product alumina. During the decomposition process of alumina production sodium aluminate solution, a crystal growth a...

AI Technical Summary

Problems solved by technology

At present, the crystallization accelerator used for the decomposition of sodium aluminate solution in the production of alumina is usually kept secret on its chemical composition, physical properties and crystallization mechanism. The particle size grows, but the strength is poor