Direct Leaching of Low-Grade Zinc Oxide Ore Containing High Amounts of Iron and Manganese

  • Faraz Soltani
  • Reza Aram
  • Mokhtar Aazami
  • Hossna Darabi
  • Mehdi Ghadiri
  • Mohsen Hemmati Chegeni
  • Saeed ShirazianEmail author
Technical Paper


Consumption of zinc metal has been rapidly increased in the world. Zinc metal exists as oxide, sulfide, carbonate and silicate ores, among which zinc oxide ores have not been mined because it is very difficult to separate zinc from gangue or to concentrate using the conventional flotation processes. In the current study, a low-grade zinc oxide ore containing 5.9% Zn, 33.4% Fe and 13.7% Mn was selected to investigate direct leaching. Results of the direct leaching at conventional conditions showed that the Zn leaching efficiency was improved at high acidity, high temperature and grinding conditions and reached about 60% at temperature of 50 °C, d80 of 110 microns, leaching time of 120 min and sulfuric acid consumption of 3.3 kg/kg Zn. Results showed that between 20 and 30% of zinc is associated with other species containing manganese IV. In the reductive leaching experiments by using Na2SO3 as reductant, the maximum Zn and Mn leaching efficiencies are about 82.7% and 96.2%. Dissolving high manganese as impurity in the pregnant solution is a potential concern with the reductive leaching process that needs further investigation.


Low-grade zinc oxide ore Separation Manganese Direct leaching Reductive leaching 



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Copyright information

© The Indian Institute of Metals - IIM 2019

Authors and Affiliations

  • Faraz Soltani
    • 1
  • Reza Aram
    • 2
  • Mokhtar Aazami
    • 3
  • Hossna Darabi
    • 4
  • Mehdi Ghadiri
    • 5
  • Mohsen Hemmati Chegeni
    • 1
  • Saeed Shirazian
    • 6
    • 7
    Email author
  1. 1.Department of Mining EngineeringArak University of TechnologyMarkaziIran
  2. 2.Academic Center for Education, Culture and Research (ACECR) on TMUTehranIran
  3. 3.Department of Mining EngineeringUniversity of KurdistanSanandajIran
  4. 4.Mineral Processing Department, Engineering FacultyTarbiat Modares UniversityTehranIran
  5. 5.Young Researchers and Elite Club, South Tehran Branch, Islamic Azad UniversityTehranIran
  6. 6.Department for Management of Science and Technology DevelopmentTon Duc Thang UniversityHo Chi Minh CityVietnam
  7. 7.Faculty of Applied SciencesTon Duc Thang UniversityHo Chi Minh CityVietnam

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