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Metallurgical and Materials Transactions B

, Volume 2, Issue 11, pp 3115–3122 | Cite as

Acid bake-leach-flotation treatment of offgrade molybdenite

  • H. R. Spedden
  • J. D. Prater
  • P. B. Queneau
  • G. G. Foster
  • W. S. Pickles
Process Metallurgy

Abstract

A process has been developed and piloted to reject Cu, Pb, Fe, P, Bi, Sb, elemental sulfur, and insol from molybdenite concentrate without decomposing the contained molybdenite and rhenium. The impure concentrate is first heated with concentrated sulfuric acid to attain a 260° to 290°C final bed temperature. This bake not only oxidizes the contaminating sulfides, but also activated the concentrate for later rejection of insol by flotation. Two stages of leaching follow the sulfation step. The first is an acidified water leach which extracts the oxidized Cu, Fe, and P; the second leach rejects the Pb, Bi, and Sb into a warm concentrated solution of sodium chloride. Final upgrading is achieved by conventional froth flotation. The chemistry of the process as well as results obtained from its implementation in a 5000 lb per day pilot plant are presented.

Keywords

Molybdenite Molybdenite Concentrate Elemental Sulfur Reaction Product 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Minerals, Metals & Materials Society - ASM International - The Materials Information Society 1971

Authors and Affiliations

  • H. R. Spedden
    • 1
  • J. D. Prater
    • 1
  • P. B. Queneau
    • 1
  • G. G. Foster
    • 1
  • W. S. Pickles
    • 1
  1. 1.Kennecott Research CenterKennecott Copper, Corp.Salt Lake City

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