Ag^(+)催化微生物氧化含砷难处理金矿石试验研究  

Experimental research on Ag^(+) catalyzed microbial oxidation of refractory gold ore containing arsenic

作　　者：胡佳航 李文豪 黄李金鸿 李新冬[2,3] 丁伟 张鑫 黄万抚[1,2,3] Hu Jiahang;Li Wenhao;Huang Lijinhong;Li Xindong;Ding Wei;Zhang Xin;Huang Wanfu(College of Resources and Environmental Engineering,Jiangxi University of Science and Technology;Ganzhou Ganjiang River Basin Water Quality Security Technology Innovation Center,Jiangxi University of Science and Technology;Ganzhou Key Laboratory of Basin Pollution Simulation and Control;School of Architecture and Design,Jiangxi University of Science and Technology)

机构地区：[1]江西理工大学资源与环境工程学院 [2]江西理工大学赣州市赣江流域水质安全保障技术创新中心 [3]赣州市流域污染模拟与控制重点实验室 [4]江西理工大学建筑与设计学院

出　　处：《黄金》2022年第10期58-64,共7页Gold

基　　金：国家自然科学基金项目(51864017)。

摘　　要：含砷难处理金矿石生物氧化预处理技术是一种绿色环保技术,但存在反应周期长、浸出效果不理想等问题。研究了添加Ag^(+)催化剂来提高生物氧化效率,并探讨了不同Ag^(+)质量浓度和浸出时间对含砷难处理金矿石生物氧化的影响。结果表明:当添加Ag^(+)质量浓度为20 mg/L时,砷浸出率最高为53.38%,氧化还原电位持续上升最后趋于稳定;添加Ag^(+)后的pH比不添加Ag^(+)时上升更多,这是因为添加Ag^(+)后生成了更多Fe^(3+),为细菌提供了更多的营养物质。对不同生物氧化阶段的矿样进行XRD、SEM-EDS、XPS等表征分析发现,添加Ag^(+)可使矿样更加疏松多孔,提高砷浸出率,且可加速生物浸出,缩短生物氧化周期,提高生物氧化效率。Bio-oxidation of refractory gold ore containing arsenic is a green environmental protection technology.Bio-oxidation of refractory gold ores containing arsenic has some disadvantages,such as a long reaction period and unsatisf actory leaching effect.Therefore,the addition of Ag^(+)catalyst to improve its oxidation efficiency is studied,and the influence of different Ag^(+)mass concentrations and leaching time on the bio-oxidation of refractory gold ore containing arsenic is discussed.The results showed that when 20 mg/L Ag^(+)is added,the highest arsenic leaching rate was 53.38%.The redox potential continues to rise and finally tends to be stable.After Ag^(+)addition,the pH rises more than that without Ag^(+)addition,due to the fact that Ag^(+)addition generates more Fe^(3+)and provides more nutrients for bacteria.The ore samples in different oxidation stages are characterized by XRD,SEM-EDS and XPS,respectively.It is found that the addition of Ag^(+)can make the ore sample porous,increase arsenic leaching rate,accelerate bioleaching,shorten the bioleaching period,and improve oxidation efficiency.

关 键 词：生物氧化 含砷难处理金矿 Ag^(+) 催化剂 砷浸出率 氧化还原电位 

分 类 号：TF831[冶金工程—有色金属冶金]