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Main uses of cryolite

Natural output is scarce and usually artificially produced. Mainly used as a flux for aluminum electrolysis; Also used as a wear-resistant additive for grinding products, it can effectively improve the wear resistance, cutting and cutting forces of grinding wheels, extend the service life and storage time of grinding wheels; Fluxes for ferroalloys and boiling steel, non-ferrous metal fluxes, casting deoxidizers, olefin polymerization catalysts, as well as emulsifiers for glass anti reflective coatings, enamel, glass whitening agents, flux for welding materials, fillers for the ceramic industry, pesticides and insecticides.

Industrial quality requirements

The largest amount of cryolite is used in the aluminum industry, with an annual consumption of approximately 700000 tons worldwide. In 1999, the market sales volume of cryolite in China was approximately 130000 tons. As a flux for electrolytic aluminum smelting, cryolite must meet certain requirements in terms of sodium aluminum molecular ratio, impurity content, water content, etc.

Firstly, the higher the ratio of sodium to aluminum in cryolite, the better. The higher the molecular ratio, the higher the current efficiency of electrolytic aluminum smelting, the less fluorine loss, and the less environmental pollution caused. Moreover, polymers are more suitable for use in industries other than the aluminum industry than cryolite

Secondly, the content of impurities such as silicon oxide, iron oxide, and phosphorus pentoxide in cryolite is lower, which directly affects the quality of aluminum ingots and the current efficiency of aluminum smelting

Thirdly, the water content of cryolite should also be as low as possible, as the presence of water will increase the consumption of cryolite.

Status of Cryolite in China

The production and application of high molecular weight cryolite have been studied and discussed in the United States and Japan, and the production of high molecular weight cryolite using sodium fluorosilicate as raw material has achieved industrial production. China's cryolite products comply with the standards of GB/T4291-2007, but each production enterprise will develop corresponding enterprise technical indicators based on the purpose and user requirements. The supply of cryolite in the market is relatively tight, which is closely related to the immature production technology of manufacturers. The products cannot meet user requirements, and some raw materials used are also relatively tight, resulting in high raw material costs, such as fluorite. In August 2008, the domestic market price of cryolite in China was around 5000 yuan/t.

Physicochemical parameters of ice crystals

What is cryolite

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