Abstract
A hydrometallurgical process has been developed for cobalt recovery from a waste dust formed during the colouring of glass plates. This dust, containing about 33% Co, is highly contaminated by Fe and Cr. The process consists of the following major steps: (1) leaching the dust in H 2SO 4; (2) purification of leach liquors by hydrolytic precipitation using Na 2CO 3 and/or K 2CO 3 as neutralizing agent; (3) precipitation of basic cobalt(II) carbonate; (4) dissolution of basic cobalt(II) carbonate in sulphuric acid and separation of residual chromium; (5) electrowinning of cobalt from refined sulphate solutions. A compact metallic deposit containing =99.5% Co was obtained.
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