Microwave pretreatment for thiourea leaching for gold concentrate

Nag Choul Choi, Bong Ju Kim, Kanghee Cho, Soon-Jae Lee, Cheon Young Park

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In this research, we studied the use of microwave pretreatment to enhance the efficiency of Au leaching from gold concentrate. The gold concentrate was pretreated using microwaves with different irradiation time. The sample temperature was increased up to 950 °C by the microwave irradiation. A scanning electron microscope-energy dispersive spectrometer showed the evolution of microcracks and the reduction of sulfur on the mineral surface. X-ray diffraction data also showed the mineral phase shift from pyrite to hematite or pyrrhotite. A leaching test was conducted for the microwave-treated and untreated gold concentrates using thiourea. Although the thiourea leaching recovered 80% of Au from the untreated concentrate, from the treated concentration, the Au could be recovered completely. Au leaching efficiency increased as the microwave irradiation time increased, as well as with a higher composition of thiourea.

Original languageEnglish
Article number404
JournalMetals
Volume7
Issue number10
DOIs
Publication statusPublished - 2017 Oct 1

Fingerprint

Thiourea
Thioureas
Gold
Leaching
Microwaves
Microwave irradiation
Minerals
Pyrites
Hematite
Microcracks
Sulfur
Phase shift
Spectrometers
Electron microscopes
Irradiation
Scanning
X ray diffraction
Chemical analysis
Temperature

Keywords

  • Gold
  • Microwave
  • Pyrite
  • Thiourea leaching

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Microwave pretreatment for thiourea leaching for gold concentrate. / Choi, Nag Choul; Kim, Bong Ju; Cho, Kanghee; Lee, Soon-Jae; Park, Cheon Young.

In: Metals, Vol. 7, No. 10, 404, 01.10.2017.

Research output: Contribution to journalArticle

Choi, Nag Choul ; Kim, Bong Ju ; Cho, Kanghee ; Lee, Soon-Jae ; Park, Cheon Young. / Microwave pretreatment for thiourea leaching for gold concentrate. In: Metals. 2017 ; Vol. 7, No. 10.
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