C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 33/08 (2006.01) C01B 9/08 (2006.01) C01B 33/107 (2006.01) C01F 7/50 (2006.01)
Patent
CA 2116557
2116557 9401364 PCTABS00030 This invention is a process for hydrofluoric acid digestion (20A, 20B, 20C) of an inorganic silica/alumina matrix material for the production of silicon tetrafluoride and aluminum fluoride. A matrix material is reacted with hydrofluoric acid to form silicon tetrafluoride gas and a slurry containing aluminum fluoride, undigested oxides, and both soluble/unsoluble fluoride materials. The silicon tetrafluoride gas is purified by condensing out impurities in cold traps (25) and reacted with aqueous sodium fluoride (30) to form a fluorosilicate salt slurry, which is delivered to a filter press (46) to obtain a powder. The sodium fluorosilicate powder is dried and delivered to a kiln to form silicon fluoride gas and sodium fluoride powder. The aluminum fluoride, undigested oxides, and soluble/unsoluble fluoride materials are recovered by washing, separating using a filter press, and drying in an evaporator while condensing water and excess hydrofluoric acid vapors in a condenser. The aluminum fluorides or metal fluorides are recovered from the dried solution and hydrofluoric acid is collected from the liquid condensate by fractional distillation.
Borden Ladner Gervais Llp
Gehringer Ronald C.
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