Process for the recovery of aluminum and iron salts from...

Details Process for the recovery of aluminum and iron salts from... Process for the recovery of aluminum and iron salts from...

B - Operations, Transporting

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6/210, 252/35, 3

B01J 29/04 (2006.01) C01B 39/02 (2006.01) C02F 1/52 (2006.01) C02F 1/64 (2006.01) C02F 1/66 (2006.01) C02F 9/00 (2006.01) C10K 1/20 (2006.01)

Patent

CA 1201422

ABSTRACT OF THE DISCLOSURE Aluminum and iron salts contained in acidic waste waters are recovered by precipitation by means of an alkaline earth precipitating agent. The precipitate in the form of alumi- num hydroxide and ferric oxide hydrate is separated from the supernatant liquid and the aluminum hydroxide is leached out of the ferric oxide precipitate by treatment with sodium hydroxide. The sodium hydroxide converts the aluminum hydroxide over to sodium aluminate which is further treated with sodium silicate and additional sodium hydroxide to form a crystalline zeolite. The remaining iron oxide hydrate is washed and dried and may be pelleted for use as a gas purification substance or calcined to to the iron oxide for use as a pigment.

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