C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/167
C22B 58/00 (2006.01) C22B 7/02 (2006.01)
Patent
CA 1174054
- 19 - ABSTRACT OF DISCLOSURE: A process for separating indium from cadmium, zinc and copper in zinc dusts comprises leaching the dusts with a strong sulfuric acid to form a leach solution containing indium, cadmium, zinc and other metals, adding ammomium hydroxide to the leach solution to a pH at least 4.6, and filtering the solution to form a filter cake containing indium and a filtrate containing cadmium, zinc and copper. If the dust contains significant amounts of copper, precipitation of indium with ammomium hydroxide is done at a pH 9Ø The filtrate from the ammomium hydroxide precipitation procedure is treated with lime and the ammonia removed by distillation. The ammonia distillate may be recycled. The residue after filtration and drying may be processed at a zinc refinery to recover zinc, copper and cadmium.
381428
Brunswick Mining And Smelting Corporation Limited
Primak & Co.
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