Effect of mechanical activation on the hypochlorite leaching of Sarcheshmeh molybdenite concentrate

Reshad Hesami, Ali Ahmadi, Mohammad Raouf Hosseini, Masoumeh Torabi

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Hydrometallurgical extraction of molybdenum from sulfidic molybdenite concentrates is an important issue from technical, economic, and environmental viewpoints. The influence of mechanical activation on the hypochlorite leaching of a molybdenite concentrate (Kerman, Iran) were studied in a stirred reactor at batch mode. The effects of several critical parameters, including pH, temperature, reaction time, NaClO concentration, and liquid to solid (L/S) ratio on the rate and extent of molybdenum extraction from the concentrate were investigated. Maximum molybdenum extractions, 98% and 95%, obtained for the mechanically activated and nonactivated concentrates, respectively after 60 min at 50°C, stirring speed of 500 rpm, L/S of 333 mL/g, pH of 9, and using 40% NaClO solution. Specific surface area and particles size measurements in conjunction with FE-SEM images showed that improvement in the extraction after mechanical activation could be due to increasing the surface area and changing the crystal structure of the concentrate. Mechanical activation had a significant effect on molybdenum extraction after 2 min, (13% difference in extraction); however, after 60 min, molybdenum extractions from mechanically activated and nonactivated samples were 97% and 92%, respectively. It was found that mechanical activation has a significant effect on the leaching of molybdenite in short reaction times.

Original languageEnglish
Pages (from-to)1966-1977
Number of pages12
JournalSeparation Science and Technology (Philadelphia)
Issue number12
Early online date5 Jan 2022
Publication statusE-pub ahead of print - 5 Jan 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022 Taylor & Francis Group, LLC.


The authors gratefully acknowledge the financial support from National Iranian Copper Industries Company (NICICO) especially Mr. Mehdi Molaeinasab.


  • Leaching
  • mechanical activation
  • molybdenite concentrate
  • sodium hypochlorite

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation


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