Reductive leaching of zinc and indium from industrial zinc ferrite particulates in sulphuric acid media

Zinc ferrite is the principal constituent in zinc neutral-leach residue (NLR) which is commonly treated by hot-acid leaching in electrolytic zinc plants. Reductive leaching of zinc ferrite with sphalerite concentrate as a reducing agent was performed. It was found that leaching of zinc ferrite in th...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2016-09, Vol.26 (9), p.2495-2501
Main Authors: ZHANG, Fan, WEI, Chang, DENG, Zhi-gan, LI, Cun-xiong, LI, Xing-bin, LI, Min-ting
Format: Article
Language:English
Subjects:
indium
reductive leaching
sphalerite concentrate
zinc
zinc ferrite
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Summary:Zinc ferrite is the principal constituent in zinc neutral-leach residue (NLR) which is commonly treated by hot-acid leaching in electrolytic zinc plants. Reductive leaching of zinc ferrite with sphalerite concentrate as a reducing agent was performed. It was found that leaching of zinc ferrite in the presence of sphalerit concentrate was a viable process that effectively extracted zinc and indium and converted Fe3+ into Fe2+ at the same time. Reflux leaching tests by two stages were performed to achieve extractions of 98.1% for zinc and 97.5% for indium, and a Fe2+/Fe3+ molar ratio of 9.6 in leach solution was also obtained. The leaching behaviors of other elements, such as iron, copper and tin were also studied. The results showed that iron and copper were completely leached, whereas tin presented lower extraction values.
ISSN:1003-6326
DOI:10.1016/S1003-6326(16)64342-X