Journal
WASTE MANAGEMENT & RESEARCH
Volume 25, Issue 5, Pages 440-448Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0734242X07077613
Keywords
converter slag; cobalt; copper; sulphuric acid; digestion; reclamation; wmr 668-4
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Clean processing of copper converter stag to reclaim cobalt and copper could be a challenge. An innovative and environmentally sound approach for recovering valuable metals from such a slag has been developed in the present study. Curing the slag with strong sulphuric acid, without re-smetting or roasting as practiced currently in the industry, render it accessible to leaching, and more than 95% of cobalt and up to 90% of copper was extracted together with iron by water leaching, leaving silica behind in a residue. The copper in the leach liquor was recovered by cementation with iron and the dissolved iron crystallized as ferrous sulphate monohydrate. The cobalt in the mother-liquor rich in iron was recovered by either cementation or sulphide precipitation. Operation variables in the new process were also investigated and optimized.
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