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Ag＋催化微生物氧化含砷难处理金矿石试验研究
- 胡佳航|李文豪|黄李金鸿|李新冬|丁伟|张鑫|黄万抚
- 作者单位：
- 江西理工大学资源与环境工程学院|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&赣州市流域污染模拟与控制重点实验室|江西理工大学建筑与设计学院|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&赣州市流域污染模拟与控制重点实验室|江西理工大学资源与环境工程学院|江西理工大学资源与环境工程学院|江西理工大学资源与环境工程学院&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&赣州市流域污染模拟与控制重点实验室
基金项目：
- 国家自然科学基金项目（51864017）
详细信息：
- 作者简介：
- 胡佳航（2003—），男，河南鹤壁人，大学本科，研究方向为矿物资源高效利用；江西省赣州市客家大道156号，江西理工大学资源与环境工程学院，341000；E-mail:2191457954@qq.com
- 通讯作者：
- E-mail：sim2008@sina.com，13970766871
- PDF下载
Experimental research on Ag＋ catalyzed microbial oxidation of refractory gold ore containing arsenic
- English Author：
- 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|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|College of Resources and Environmental Engineering,Jiangxi University of Science and Technology|College of Resources and Environmental Engineering,Jiangxi University of Science and Technology|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 Bas
- Unit：
- 摘要
- 在线预览
- 参考文献
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Fe3＋，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。
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
Abstract:
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 unsatisfactory 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 Fe3＋ 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.
Keywords:
biological oxidation;refractory gold ore containing arsenic;Ag＋;catalyst;arsenic leaching rate;redox potential
