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)

Abstract

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)
Volume57
Issue number12
Early online date5 Jan 2022
DOIs
Publication statusE-pub ahead of print - 5 Jan 2022
Externally publishedYes

Bibliographical note

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

Funder

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

Keywords

  • 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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