欢迎访问过程工程学报, 今天是

›› 2012, Vol. 12 ›› Issue (5): 781-784.

• 反应与分离 • 上一篇    下一篇

Ag+对含砷金精矿生物浸出的影响

张明 杨巧文 张广积 杨超   

  1. 中国矿业大学（北京）化学与环境工程学院 中国矿业大学（北京）化学与环境工程学院 中国科学院过程工程研究所 中国科学院过程工程研究所
  • 收稿日期:2012-08-27 修回日期:2012-10-11 出版日期:2012-10-20 发布日期:2012-10-20
  • 通讯作者: 杨超

Effect of Ag+ on Bioleaching of Arsenic-bearing Gold Concentrate

ZHANG Ming YANG Qiao-wen ZHANG Guang-ji YANG Chao   

  1. China University of Mining and Technology, Beijing China University of Mining and Technology, Beijing Institute of Processing Engineering ，CAS Institute of Process Engineering, Chinese Academy of Sciences
  • Received:2012-08-27 Revised:2012-10-11 Online:2012-10-20 Published:2012-10-20
  • Contact: YANG Chao

PDF

摘要： 研究了Ag+对含砷金精矿生物浸出的影响，测量了浸出液中铁、银、砷浓度及氧化还原电位(Eh)的变化，考察了Ag+对细菌密度的影响，并对浸渣进行了光谱表征. 结果表明，Ag+对含砷金精矿的生物浸出有一定的促进作用且在高浓度Fe3+条件下催化作用明显；低Ag+浓度下含砷金精矿的生物浸出率提高约10%，但Ag+浓度过高将影响细菌生长，导致浸出速率下降. Ag+催化含砷金精矿生物浸出是Ag+取代矿物表面的砷并生成Ag2S，之后被Fe3+氧化分解，重新产生Ag+，从而加速矿物的氧化分解.

关键词: 银离子, 含砷金精矿, 生物浸出, 催化

Abstract: The effect of Ag+ on bioleaching of As-bearing gold concentrate was studied. The concentrations of Fe3+, Ag+ and As in the bioleaching solution were monitored during the leaching process. The effect of Ag+ on the bacterial density was investigated and the leaching residue was characterized by XRD and SEM. The experimental results show that Ag+ can enhance the bioleaching rate especially at the high concentration of Fe3+, but the growth of bacteria was restrained under at higher concentration of Ag+, leading to the decrease of leaching rate. Based on the leaching results and leaching residue analysis, the catalytic mechanism of Ag+ was that the arsenic on the surface of concentrate was displaced by Ag+, and Ag2S formed, which could be dissolved by Fe3+, releasing Ag+ again.

Key words: silver ion, arsenic-bearing gold concentrate, bioleaching, catalysis

中图分类号: