C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/164
C01F 7/50 (2006.01) C01B 33/26 (2006.01) C01F 7/54 (2006.01)
Patent
CA 1196173
Abstract of the Disclosure The invention relates to a method for recovering useable products from waste products deriving from the manufacture of aluminium fluoride on the basis of aluminium hydroxide and fluosilicic acid. Mother liquors and washing water from a scrubber in said process, which solutions contain aluminium, silica, fluorine, and phosphorous are reacted in a first step with sodium ions at pH 2-3, and a temperature of 50-100°C to give a precipitate of sodium fluoro- aluminate, which is isolated. The filtrate from said first step can be reacted with the silica waste product obtained in the above mentioned aluminium fluoride manufacture. The method thus enables recovery of useful and valuable products from what would otherwise be waste material and thus also reduces environmental problems caused by the waste material.
418755
Boliden Aktiebolag
Fetherstonhaugh & Co.
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