Microwave pretreatment for thiourea leaching for gold concentrate

Nag Choul Choi, Bong Ju Kim, Kanghee Cho, Soonjae Lee, Cheon Young Park

Research output: Contribution to journalArticle

6 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

Keywords

  • Gold
  • Microwave
  • Pyrite
  • Thiourea leaching

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint Dive into the research topics of 'Microwave pretreatment for thiourea leaching for gold concentrate'. Together they form a unique fingerprint.

  • Cite this