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Selective Sulfidation of Lead Smelter Slag with Pyrite and Flotation Behavior of Synthetic ZnS

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Abstract

The selective sulfidation of lead smelter slag with pyrite in the presence of carbon and Na salts, and the flotation behavior of synthetic ZnS were studied. The effects of temperature, time, pyrite dosage, Na salts, and carbon additions were investigated based on thermodynamic calculation, and correspondingly, the growth mechanism of ZnS particles was studied at high temperatures. The results indicated that the zinc in lead smelter slag was selectively converted into zinc sulfides by sulfidation roasting. The sulfidation degree of zinc was increased until the temperature, time, pyrite, and carbon dosages reached their optimum values, under which it was more than 95 pct. The growth of ZnS particles largely depended upon roasting temperature, and the ZnS grains were significantly increased above 1373 K (1100 °C) due to the formation of a liquid phase. After the roasting, the zinc sulfides generated had a good floatability, and 88.34 pct of zinc was recovered by conventional flotation.

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Acknowledgments

The authors would like to thank the Innovation Project for Postgraduates of Central South University (2015zzts090) and National Natural Science Foundation of China (51204210) for funding this research.

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Authors and Affiliations

  1. School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, P. R. China

    Junwei Han (Doctor), Wei Liu (Doctor), Dawei Wang (Masters), Fen Jiao (Doctor), Tianfu Zhang (Masters) & Wenqing Qin (Professor)

Authors
  1. Junwei Han
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  2. Wei Liu
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  3. Dawei Wang
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  4. Fen Jiao
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  5. Tianfu Zhang
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  6. Wenqing Qin
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Corresponding author

Correspondence to Wei Liu.

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Manuscript submitted March 6, 2016.

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Han, J., Liu, W., Wang, D. et al. Selective Sulfidation of Lead Smelter Slag with Pyrite and Flotation Behavior of Synthetic ZnS. Metall Mater Trans B 47, 2400–2410 (2016). https://doi.org/10.1007/s11663-016-0693-y

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