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Effect of Oxidative Pretreatment and Lead Nitrate Addition on the Cyanidation of Refractory Gold Ore

  • Faraz SoltaniEmail author
  • Mehdi Marzban
  • Hossna Darabi
  • Mokhtar Aazami
  • Mohsen Hemmati Chegeni
Cleaner Manufacturing of Critical Metals
  • 8 Downloads

Abstract

Cyanidation is the main process in gold leaching. There are several parameters that affect gold recovery and cyanide consumption. In this paper, the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and 0.5% sulfur were investigated. Au recovery was increased from 79.4% to 89.4% in the presence of 500 g/t lead nitrate. Results of pretreatment experiments showed that lead nitrate had little effect on the Au recovery in comparison to the direct leaching condition. Cyanide consumption in the direct leaching tests was about 2.5 times higher than that of pretreatment-leaching tests. The amount of arsenic in the pretreatment solution was dramatically decreased and hence the cyanide consumption was decreased. Thermodynamic calculations showed that the precipitation of arsenic as \( {\text{Ca}}_{3} \left( {{\text{AsO}}_{4} } \right)_{2} \cdot 6{\text{H}}_{2} {\text{O}} \) is the main reason for lower cyanide consumption in the pretreatment-leaching tests. The results showed that cyanide consumption is still high (about 2 kg/t sodium cyanide), and that copper ions could be considered as one of the cyanide consumers that needs further investigation.

Notes

Acknowledgements

This project is supported by Iranian Mines and Mining Industries Development and Renovation Organization and Zarshuran Gold Mines and Mineral Industries. The authors are grateful for these supports.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Department of Mining EngineeringArak University of TechnologyArakIran
  2. 2.Pishtazan Kanikaran CompanyTehranIran
  3. 3.Mineral Processing Department, Engineering FacultyTarbiat Modares UniversityTehranIran
  4. 4.Department of Mining EngineeringUniversity of KurdistanSanandajIran

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