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Reaction behaviors of Pb-Zn sulfates during reduction roasting of the zinc leaching residue and flotation of the artificial sulfide minerals

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  • Available online: 26 February 2020
  • In this paper, reaction behaviors of Pb-Zn sulfates during reduction roasting of the zinc leaching residue and flotation of the artificial sulfide minerals were deeply investigated. The reaction behaviors of Pb-Zn sulfates were characterized by chemical analyses, X-ray diffraction (XRD), Scanning electron microscopy-Energy dispersive spectroscopy (SEM-EDS) and particle size analyses. Chemical analyses results showed that the transformation ratios of PbSO4 and ZnSO4 reached 65.51wt% and 52.12wt%, respectively, after the reduction roasting. The introduction of sulfidation agent further improved their transformation ratios. SEM-EDS analyses revealed that the temperature obviously affected the particle size, crystal growth and morphology of the artificial Pb-Zn sulfide minerals. Particle size analyses presented that particle size of the material increased after the roasting. Flotation results showed that a flotation concentrate, assaying 12.01wt% Pb, 27.78wt% Zn and 697.54 g/t Ag, was obtained with their respective recoveries of 60.54wt%, 29.24wt% and 57.64wt%. It was proposed to preferentially recover the generated Pb-Zn sulfide minerals and the Ag-containing minerals by flotation from the zinc leaching residue after the reduction roasting.
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  • The authors would like to acknowledge the National Natural Science Foundation of China (No.51964027), the Yunnan Province Applied Basic Research Project (2017FB084), the Foundation of Yunnan Educational Committee, China (No. 2019J0037) and the Testing and Analyzing Funds of Kunming University of Science and Technology (2018T20150055) for financial supports.

     

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Reaction behaviors of Pb-Zn sulfates during reduction roasting of the zinc leaching residue and flotation of the artificial sulfide minerals

  • 1) State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China
  • 2) Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China
  • 3) School of Minerals Processing and Bioengineering, Central South University, Changsha, Hunan 410083, P. R. China

Abstract: In this paper, reaction behaviors of Pb-Zn sulfates during reduction roasting of the zinc leaching residue and flotation of the artificial sulfide minerals were deeply investigated. The reaction behaviors of Pb-Zn sulfates were characterized by chemical analyses, X-ray diffraction (XRD), Scanning electron microscopy-Energy dispersive spectroscopy (SEM-EDS) and particle size analyses. Chemical analyses results showed that the transformation ratios of PbSO4 and ZnSO4 reached 65.51wt% and 52.12wt%, respectively, after the reduction roasting. The introduction of sulfidation agent further improved their transformation ratios. SEM-EDS analyses revealed that the temperature obviously affected the particle size, crystal growth and morphology of the artificial Pb-Zn sulfide minerals. Particle size analyses presented that particle size of the material increased after the roasting. Flotation results showed that a flotation concentrate, assaying 12.01wt% Pb, 27.78wt% Zn and 697.54 g/t Ag, was obtained with their respective recoveries of 60.54wt%, 29.24wt% and 57.64wt%. It was proposed to preferentially recover the generated Pb-Zn sulfide minerals and the Ag-containing minerals by flotation from the zinc leaching residue after the reduction roasting.

Acknowledgements  The authors would like to acknowledge the National Natural Science Foundation of China (No.51964027), the Yunnan Province Applied Basic Research Project (2017FB084), the Foundation of Yunnan Educational Committee, China (No. 2019J0037) and the Testing and Analyzing Funds of Kunming University of Science and Technology (2018T20150055) for financial supports.
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