Roasting temperature effect on the recovery of refractory gold and silver in pyrite concentrates

  • Yipeng Zhang
  • Ke Yang
  • Yi Fang
  • Aurora Robledo Cabrera
  • Changsheng Peng
  • Alejandro López-Valdivieso universidad autonoma de San Luis Potosi

Abstract


Pyrite concentrates with refractory gold and silver were roasted at different temperatures to improve the recovery of the metals by cyanide leaching. SEM characterization of the calcine revealed that the gold occluded in the pyrite less than one micron, and roasting produced channels in the concentrate, exposing the gold particles to the leaching solution. Gold and silver recoveries were maximum in the temperature range of 500-600°C due to the calcine high porosity. The Au and Ag recovery improved from 25 to 86% and 50 to 73%, respectively. Gold secondary encapsulation due to the sintering and formation of silver ferrite in higher roasting temperatures hence recoveries decreased.

Author Biographies

Yipeng Zhang

Preparation of manuscript, 

Performance of experiments

results discussion

 

Ke Yang

Support in the performance of the experiment

support in the preparation of manuscript

Yi Fang

Support in the performance of the experiment

support in the preparation of the manuscript

Aurora Robledo Cabrera

Help characterization by SEM and XRD 

Alejandro López-Valdivieso , universidad autonoma de San Luis Potosi

experimental design

Search for funds and financial support

analysis results and discussion

guidance of manuscript 

 

Published
2021/07/12
How to Cite
ZhangY., YangK., FangY., Robledo CabreraA., PengC., & López-Valdivieso A. (2021). Roasting temperature effect on the recovery of refractory gold and silver in pyrite concentrates. Journal of Mining and Metallurgy, Section B: Metallurgy, 57(2), 235-243. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/28354
Section
Original Scientific Paper