METHOD OF DISPOSING PRODUCTION WASTE CONTAINING FLUOROSILICATES Russian patent published in 2018 - IPC C01B33/10 C01B33/142 C01B7/19 C01B9/08 C01D3/02 C01D5/02 B09B3/00 

FIELD: chemistry.

SUBSTANCE: fluosilicates are treated with sodium hydroxide and/or sodium carbonate at a temperature of 80-100°C. The resulting sodium fluoride and sodium silicate solution are separated by filtration. Sodium fluoride is either isolated or treated with concentrated sulfuric acid at a temperature of 130-150°C and hydrogen fluoride is separated off, which is absorbed by water to form hydrofluoric acid. The residue obtained after extraction of hydrogen fluoride is treated with a hydroxide and/or sodium carbonate to form sodium sulfate. A solution of sodium silicate is subjected to carbon dioxide treatment and silica is recovered.

EFFECT: disposal of production wastes generated during the production of phosphorus fertilizers and processing of aluminium ores is ensured, with the production of pure products from them.

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