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黄金科学技术 ›› 2017, Vol. 25 ›› Issue (4): 106-112.doi: 10.11872/j.issn.1005-2518.2017.04.106

• 冶炼技术与装备研发 • 上一篇    下一篇

含砷难处理金精矿生物预氧化过程中砷价态的变化及其对细菌的影响

张玉秀1,郭德庚1,李媛媛  2,张广积  2,3*   

  1. 1.中国矿业大学(北京)化学与环境工程学院,北京   100083;
    2.中国科学院过程工程研究所,中国科学院绿色过程与工程重点实验室,北京   100190;
    3.中国科学院大学化学与化工学院,北京   100149
  • 收稿日期:2017-05-08 修回日期:2017-07-11 出版日期:2017-08-30 发布日期:2017-10-30
  • 通讯作者: 张广积(1973-),男,江苏常熟人,研究员,从事生物冶金研究工作。gjzhang@ipe.ac.cn
  • 作者简介:张玉秀(1962-),女,陕西合阳人,教授,从事环境微生物研究工作。zhangyuxiu@cumtb.edu.cn
  • 基金资助:

    国家自然科学基金项目“臭氧微气泡氧化三价砷形成臭葱石沉淀除砷方法的研究”(编号:21576271)、“新型生物冶金测试反应器及气液固三相流测量仪器研制”(编号:21427814)、国家“973”课题“共伴生难处理两性金属资源高效清洁转化综合利用基础研究”(编号:2013CB632601)和中央高校基本科研费基金资助项目“废水处理中微生物种群结构研究”(编号:2010YH05)联合资助

Variation of Arsenic Valence and Its Effect on Bacteria During Biooxidation of Refractory Gold Concentrate Containing Arsenic

ZHANG Yuxiu 1,GUO Degeng 1,LI Yuanyuan 2,ZHANG Guangji 2,3   

  1. 1.China University of Mining and Technology ( Beijing),Beijing    100083,China;
    2.Key Laboratory of Green Process and Engineering,Institute of Process Engineering,Chinese Academy of Sciences, Beijing    100190,China;
    3.School of Chemistry and Chemical Engineering,University of Chinese Academy of Sciences,Beijing    100149,China
  • Received:2017-05-08 Revised:2017-07-11 Online:2017-08-30 Published:2017-10-30

摘要:

作为一种环境友好的冶金技术,难处理金矿的生物预氧化工艺已经在世界各地得到了推广应用,但是生物预氧化过程中释放出的三价砷会对细菌造成伤害,导致细菌的生长受到抑制。本文采用嗜酸氧化亚铁硫杆菌(Acidithiobacillus ferrooxidans,At.f)在不同条件下进行含砷难处理金精矿生物预氧化实验,研究生物预氧化过程中砷的价态变化及其对细菌生长情况的影响。实验结果表明:在生物预氧化过程中,微生物氧化作用产生的高氧化还原电位(大于480 mV)可以使矿物溶解释放出的三价砷较快地氧化为五价砷,使其毒性减弱。在实验中发现,较低的初始矿浆浓度和较高的细菌接种量有利于产生较高氧化还原电位,使生物预氧化操作顺利启动。

关键词: 生物预氧化, 难处理精矿, 砷, 嗜酸氧化亚铁硫杆菌

Abstract:

As an environmentally friendly technology,the biooxidation pretreatment of refractory gold ore has been applied widely all around the world.However,in the process of preliminary biooxidation,the growth of the bacteria can be inhibited by the  toxicity of the released As(III).In this study,biooxidation experiment of arsenic containing gold concentrate was carried out with Acidi-thiobacillus ferrooxidans under different conditions.The variation of arsenic valence in the solution was monitored and its effect on bacterial growth was investigated.The experimental results showed that the released trivalent arsenic As(III) could be quickly oxidized to pentavalent arsenic As(V) at higher redox potential(Eh > 480 mV),which was less toxic.In the experiments,it was found that lower initial pulp density and high inoculation amount were good for attaining high redox potential in a short time,and therefore were helpful to start the biooxidation process.

Key words:  biooxidation, refractory gold concentrate, arsenic, Acidithiobacillus ferrooxidans

中图分类号: 

  • TF831
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