Transformation of pyrite to pyrrhotite in the presence of Au-Ag alloys at 500 °c

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3 Citations (Scopus)

Abstract

Dry annealing of AuxAg1-x alloys (x = 0.19, 0.35, 0.56 or of fineness 300, 500, 700‰) and pyrite was used to reveal the solubility of Au (Ag) in FeS2 and study phase equilibria in the FeS2-AuxAgi1-x system at 500 °C. Pyrrhotite, acanthite, and uytenbogaardtite and Au-Ag alloys with increased fineness were established at the contacts of pyrite blocks with Au-Ag plates. The obtained results evidence the absence of solubility between FeS2 and Au (Ag) at 500 °C. The Ag content in alloys influences the stability of pyrite and contributes to its transformation in pyrrhotite and sulfidation and ennobling of Au-Ag alloys. Au-Ag sulfides and pyrrhotite may be present in the sulfide ores of metamorphogene deposits as annealing products of Au-Ag-pyrite-bearing ores.

Original languageEnglish
Pages (from-to)2731-2737
Number of pages7
JournalAmerican Mineralogist
Volume101
Issue number12
DOIs
Publication statusPublished - 1 Dec 2016

Keywords

  • Au-Ag sulfides
  • Desulfidation
  • ennobling of Au-Ag alloys
  • isomorphism
  • pyrite
  • pyrrhotite
  • sulfidation
  • thermodiffusion
  • visible and "invisible" gold (silver)

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