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Mechanism of Na2SO4 on Refractory Gold Concentrate at Roasting Pretreatment

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Drying, Roasting, and Calcining of Minerals

Abstract

It could significantly increase the leaching rate of refractory gold concentrate containing sulfur and arsenic by roasting pretreatment with adding certain amount of sodium sulfate, and the mechanism of that was systematically researched with DSC, XRD and SEM in this paper. Results indicated that the mechanism of Na2SO4 on double refractory gold concentrate at roasting pretreatment can be summed up in the following three aspects: Firstly, Na2SO4 can react with SO2 and SO3 which is produced by the oxidation of sulfides and generate Na2S2O7(l), which plays buffer effect on sulfides exothermic oxidation, avoiding the secondary-encapsulated of gold. Secondly, the liquid phase of Na2S2O7 can cover mineral particles’ surface that possesses a sintering effect, it leads to internal cracks of the particles. Finally, mineral particles will gather with sodium sulfate particles as the center that can improve the permeability of the layer.

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Author information

Authors and Affiliations

  1. School of Minerals Processing and Bioengineering, Central South University, Hunan, 410083, China

    Qian Li, Jian-jun Hu, Yong-bin Yang, Bin Xu & Tao Jiang

Authors
  1. Qian Li
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  2. Jian-jun Hu
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  3. Yong-bin Yang
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  4. Bin Xu
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  5. Tao Jiang
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Editor information

Editors and Affiliations

  1. Midrex Technologies, Pineville, North Carolina, USA

    Thomas P. Battle (Senior Metallurgist) (Senior Metallurgist)

  2. Montana Tech, USA

    Jerome P. Downey (Associate Professor, the Hazen Research Professor of Extractive Metallurgy, and Goldcorp Professor, the campus Director) (Associate Professor, the Hazen Research Professor of Extractive Metallurgy, and Goldcorp Professor, the campus Director)

  3. Montana University System Materials Science Ph.D. program, USA

    Jerome P. Downey (Associate Professor, the Hazen Research Professor of Extractive Metallurgy, and Goldcorp Professor, the campus Director) (Associate Professor, the Hazen Research Professor of Extractive Metallurgy, and Goldcorp Professor, the campus Director)

  4. Thermal Processing group, Hazen Research, Inc., Golden, Colorado, USA

    Lawrence D. May (Vice President, Facility Manager) (Vice President, Facility Manager)

  5. Kingston Process Metallurgy Inc., Kingston, Ontario, Canada

    Boyd Davis (principal) (principal)

  6. IND LLC, USA

    Neale R. Neelameggham

  7. University of Leeds, UK

    Sergio Sanchez-Segado

  8. Center for Iron and Steelmaking Research in the Department of Materials Science and Engineering, Carnegie Mellon University, USA

    P. Chris Pistorius (POSCO Professor and Co-Director) (POSCO Professor and Co-Director)

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© 2015 TMS (The Minerals, Metals & Materials Society)

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Li, Q., Hu, Jj., Yang, Yb., Xu, B., Jiang, T. (2015). Mechanism of Na2SO4 on Refractory Gold Concentrate at Roasting Pretreatment. In: Battle, T.P., et al. Drying, Roasting, and Calcining of Minerals. Springer, Cham. https://doi.org/10.1007/978-3-319-48245-3_8

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