An XPS and XANES Study on the Bioleaching of Arsenopyrite with or without Pyrite

Yi Yang, Weihua Liu, Chun Wang, Miao Chen, Rahul Ram, Suresh K. Bhargava

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch

1 Citation (Scopus)

Abstract

In the present study, we investigated the bioleaching of arsenopyrite with or without pyrite by moderate thermophiles. In both chemical leaching and bioleaching, the addition of pyrite decreased the leaching rate of arsenopyrite. The arsenic speciation and minerology changes in the residues were analysed by X-ray Absorption Near Edge Structure (XANES) Spectroscopy, X-ray Photoelectron Spectroscopy (XPS) and powder X-ray Diffraction (XRD). The XANES analysis showed no detectable arsenopyrite in the final residues from the experiments without pyrite. However, there was still 21.7% of arsenic species presented as arsenopyrite after bioleaching, when the initial arsenopyrite/pyrite ratio was 1:5. The XPS analysis revealed there was only As(V) on the surface of most of the residues, except on one chemically leached sample where As(III) was found.

Original languageEnglish
Title of host publication22nd International Biohydrometallurgy Symposium
EditorsWolfgang Sand, Kathrin Rubberdt, Franz Glombitza, Wolfgang Sand, Mario Vera Veliz, Sabine Willscher, Sabrina Hedrich, Axel Schippers
PublisherTrans Tech Publications
Pages53-56
Number of pages4
Volume262
ISBN (Print)9783035711806
DOIs
Publication statusPublished - 1 Jan 2017
Externally publishedYes
EventInternational Biohydrometallurgy Symposium (IBS) -
Duration: 1 Jan 2050 → …

Publication series

NameSolid State Phenomena
PublisherTrans Tech Publications Ltd
Volume262
ISSN (Electronic)1662-9779

Conference

ConferenceInternational Biohydrometallurgy Symposium (IBS)
Abbreviated titleIBS
Period1/01/50 → …

Keywords

  • Arsenopyrite
  • As speciation
  • Bioleaching
  • XANES
  • XPS

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