Sand mill method for producing submicron aluminum hydroxide and aluminium oxide

Abstract

The invention relates to the technical field of aluminum oxide, and discloses a sand mill method for producing submicron aluminum hydroxide, which comprises the following raw materials in parts by weight: 50 parts of high-sulfur bauxite, 2 parts of lime, 3 parts of circulating mother liquor, 5 parts of red mud washing liquor, 1 part of crystal seed and 0.7 part of sodium hydroxide. The crystal seed comprises the following raw materials in parts by weight: 1 part of aluminum hydroxide and 1.2 parts of water. According to the invention, the seeds prepared by a sand mill method are added to realize the purpose of submicron aluminum hydroxide with high quality standard, reasonable crystal structure and uniform granularity, the raw material bauxite is desulfurized, the generated sodium aluminate solution is filtered and purified, and the aluminum hydroxide seeds with certain granularity and concentration prepared by the sand mill method are added to prepare the submicron aluminum hydroxide. The aluminum hydroxide seeds and the sodium aluminate solution are subjected to enhanced crystallization, agglomeration, crystal growth and crystal qualitation, so that new submicron aluminum hydroxide and aluminum oxide materials are prepared, and the purposes of high-quality standard, reasonable crystal form structure and uniform particle size of the submicron aluminum hydroxide and aluminum oxide materials are achieved.

Description

technical field [0001] The invention relates to the technical field of alumina, in particular to a method for producing submicron aluminum hydroxide and alumina by a sand mill method. Background technique [0002] Technical characteristics of submicron aluminum hydroxide: aluminum hydroxide improved through submicron aluminum hydroxide production technology, white powder crystal appearance, non-toxic, high whiteness, moderate hardness, good defluorination and coordination performance, detergency Strong, chemically stable. Aluminum hydroxide can not only react with acid to form salt and water, but also react with strong base to form salt and water. Therefore, it is also an amphoteric hydroxide and is the main raw material for toothpaste-grade AH factor. Secondly, submicron aluminum hydroxide is stable below 200°C, and begins to release water above 200°C. It has three functions of flame retardancy, smoke elimination, and filling, and can be used as a flame-retardant material....

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Problems solved by technology

[0003] At present, domestic alumina factories generally use the traditional production of aluminum hydroxide and alumina as metallurgical grade raw material products. Due to the high content of impurities such as silicon oxide, iron oxide, sodium oxide, attached alkali, and burning reduction in the product, the attached value is low. limited use

In the traditional production of ultra-fine aluminum hydroxide, chemical dry seeds are generally used, and the particle size of the seeds is as large as 6 microns. The resulting products often appear in the form of lumps, with low whiteness, low dispersion, and poor crystal structure, resulting in product loss. The quality and particle size are low, the production is difficult, and the waste of seeds is caused, and the production cost is high

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