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Arsenic Reduction and Cobalt Removal in the Arsenic-Containing Leachate from Alkali Leaching of Arsenic-Containing Cobalt/Nickel Residue

  • Jinxi Qiao
  • Shuang Long
  • Zhiqiang Liu
  • Xintao Sun
  • Zhaoming Sun
  • Hualei Miao
  • Jinyang Chen
  • Ailiang ChenEmail author
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

The arsenic and zinc could be leached from cobalt/nickel residue containing arsenic in an alkali medium with air as an oxidant under normal pressure conditions. The leachate contained arsenic and zinc. The arsenic should be reduced for removing cobalt from the zinc sulfate. The results showed that the optimal conditions were listed as follows: temperature of 60 °C, reaction time of 2.5 h, mass ratio of reducing agent to arsenic of 6, the stirring speed of 200 r/min. Under these optimal conditions, the removal ratio of cobalt was over 97%, much more than that without reduction. Then the solution contained less than 0.8 mg/L of cobalt, meeting the standard of zinc industrial production. Arsenic of the leaching solution was effectively recycled for the technology of the arsenic-salt-removal-cobalt-process, reducing the toxic effect of arsenic. It reduced the capital investment of cobalt removal. The method of arsenic recycle effectively decreased the loss of the main metal zinc during the process.

Keywords

Arsenic reduction Cobalt removal Cobalt/nickel residue Hydrazine hydrate 

Notes

Acknowledgements

The financial support from the Major Science and Technology Projects in Gansu Province (No.1602FKDC007) and the Research Fund Program of State Key Laboratory of Rare Metals Separation and Comprehensive Utilization (No. GK-201805) are gratefully acknowledged.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Jinxi Qiao
    • 1
    • 2
    • 3
  • Shuang Long
    • 4
  • Zhiqiang Liu
    • 2
    • 3
  • Xintao Sun
    • 1
  • Zhaoming Sun
    • 1
  • Hualei Miao
    • 2
  • Jinyang Chen
    • 2
  • Ailiang Chen
    • 1
    Email author
  1. 1.School of Metallurgy and EnvironmentCentral South UniversityChangshaChina
  2. 2.Guangdong Research Institute of Rare MetalsGuangzhouChina
  3. 3.State Key Laboratory of Rare Metals Separation and Comprehensive UtilizationGuangzhouChina
  4. 4.Zhuzhou Smelter Group Company LimitedZhuzhouChina

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