期刊
METALS
卷 10, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/met10111553
关键词
zinc residue; cobalt hydroxide; cementation; leaching; oxidative precipitation
资金
- Institut de recherche de Hydro-Quebec
The electrolytic production of metallic zinc from processing zinc sulfide concentrates generates a residue containing cadmium, copper, and cobalt that need to be removed from the electrolytic zinc solution because they are harmful to the zinc electro-winning process. This residue is commonly sent to other parties that partly recover the contained elements. These elements can generate revenues if recovered at the zinc plant site. A series of laboratory tests were conducted to evaluate a method to process a zinc plant residue with the objective of recovering cobalt into a salable product. The proposed process comprises washing, selective leaching, purifying and precipitation of cobalt following its oxidation. The process allows the production of a cobalt rich hydroxide precipitate assaying 45 +/- 4% Co, 0.8 +/- 0.2% Zn, 4.4 +/- 0.7% Cu, and 0.120 +/- 0.004% Cd at a 61 +/- 14% Co recovery. Replicating the whole process with different feed samples allowed the identification of the critical steps in the production of the cobalt product; one of these critical steps being the control of the oxidation conditions for the selective precipitation step.
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