C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
23/166, 53/240
C22B 21/06 (2006.01) C01F 7/50 (2006.01) C01G 49/00 (2006.01) C22B 3/38 (2006.01) C22B 3/40 (2006.01)
Patent
CA 1091936
Title of the Invention IRON REMOVAL FROM SOLUTIONS Abstract of the Disclosure A process for the separation of iron from an aluminum fluoride aqueous solution containing iron is effected by contacting said solution with an organic extractant phase consisting essentially of a mixture of higher alkyl sub- stituted mono- and diphenyl phosphoric acids dissolved in an inert diluent to thereby transfer the iron to said organic extractant phase. Aluminum fluoride trihydrate is recovered by separating the iron-loaded organic extract from the iron- depleted aqueous raffinate containing the dissolved aluminum fluoride, and subjecting the iron-depleted aqueous raffin- ate separated from the iron-loaded organic extract to a crystallization operation whereby aluminum fluoride trihydrate crystals are produced substantially free of iron impurities. The iron-loaded organic extract is then contacted with an aqueous solution of hydrogen fluoride to thereby transfer the iron to said aqueous solution and regenerate the organic extractant, and at least a portion of the regenerated organic extractant is recycled back to the first stage of the process to extract iron from the feed alumimum fluoride solution. The efficiency of the process is further improved by adjusting the aluminum fluoride feed aqueous solution temperature to 140°-175°F. prior to contacting it with the organic extract- ant phase, maintaining the temperature within this range through out the iron extraction stages, then heating the iron-depleted aqueous raffinate to a temperature higher than 195°F, and then carrying out the crystallization at this higher temperature.
268615
Miller David J.
Wiewiorowski Tadeusz K.
Freeport Minerals Company
Kirby Eades Gale Baker
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