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RECOVERY OF INDIUM IN CONJUNCTION WITH THE REMOVAL OF CADMIUM, ZINC AND COPPER FROM LEAD, COPPER AND ZINC SMELTER OR REFINERY DUSTS
RECOVERY OF INDIUM IN CONJUNCTION WITH THE REMOVAL OF CADMIUM, ZINC AND COPPER FROM LEAD, COPPER AND ZINC SMELTER OR REFINERY DUSTS
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机译：从铅，铜和锌冶炼厂或炼厂粉尘中去除镉，锌和铜的同时回收铟
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- 19 -ABSTRACT OF DISCLOSURE:A process for separating indium from cadmium, zincand copper in zinc dusts comprises leaching the dustswith a strong sulfuric acid to form a leach solutioncontaining indium, cadmium, zinc and other metals, addingammomium hydroxide to the leach solution to a pH at least4.6, and filtering the solution to form a filter cakecontaining indium and a filtrate containing cadmium, zincand copper. If the dust contains significant amounts ofcopper, precipitation of indium with ammomium hydroxideis done at a pH 9Ø The filtrate from the ammomiumhydroxide precipitation procedure is treated with limeand the ammonia removed by distillation. The ammoniadistillate may be recycled. The residue after filtrationand drying may be processed at a zinc refinery to recoverzinc, copper and cadmium.
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