C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/166, 53/236
C22B 21/00 (2006.01) C01F 7/47 (2006.01) C01G 15/00 (2006.01) C22B 58/00 (2006.01)
Patent
CA 1041305
ABSTRACT OF THE DISCLOSURE An improvement in the well known "Bayer" process is provided herein. In particular, a process is provided for the recovery of gallium and alumina from bauxite including the following steps: (a) dissolving the ore in caustic soda solution under pressure, preferably carried out at a pressure of 5 atmospheres; (b) precipitating alumina from the remaining caustic soda solution by reduction of temperature and pressure; (c) subjecting the resulting mother liquor from step (b) to an elevated temperature of 60° to 450°C and a pressure of 2 to 100 atmos.in the presence of an oxygen-containing atmosphere, of an atmosphere consisting substantially of oxygen at a pressure within the range 20 to 50 atmospheres and a temperature within the range 150° to 350°C; and finally (d) cementation of the gallium remaining in solution by contact with metallic aluminum, the metallic aluminum preferably being in the form of turnings or coarse filings. Step (a) is preferably carried out at a pressure of 5 atmospheres; and step (c) is carried out in the presence of an atmosphere consisting substantially of oxygen at a pressure within the range 20 to 50 atmospheres, and a temp- erature within the range 150°C to 350°C. The metallic aluminum used in step (d) is preferably in the form of turnings or coarse fillings. This provides an easy, cheap method for the recovery of gallium and alumina from bauxite, while permitting the mother liquor to remain fit f?r reuse.
231225
Macgregor John J.
Payne John B.
Westwood Walter
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