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1 2015

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Selective reduction of PbSO4 to PbS with carbon and flotation treatment of synthetic galena

Zheng Y.-X., Liu W., Qin W.-Q., Han J.-W., Yang K., Luo H.-L.

Physicochemical Problems of Mineral Processing

2015

Vol. 51, iss. 2

535--546

In order to recover lead from the zinc leaching residues, a new technology involving selective reduction of lead sulfate to lead sulfide with carbon followed by flotation was investigated. The reduction thermodynamics of PbSO4 was discussed and the effects of molar ratio of C to PbSO4, reaction temperature and time were examined by thermogravimetry (TG) and XRD. Verification tests were further carried out to prove the conclusions of thermodynamic and TG analyses, and the transformation extent could reach 86.45% under the optimal roasting conditions. The prepared galena was then subjected to micro-flotation tests, and the highest lead recovery could reach up to 75.32%.