银离子对细菌浸出含砷铜矿中铜的影响  

Influence of Silver Ion on Leaching of Copper by Bacteria from Arsenic-containing Ore

作　　者：刘金艳[1,2] 高磊 刘志远 辛靖靖 伍赠玲 LIU Jinyan;GAO Lei;LIU Zhiyuan;XIN Jingjing;WU Zengling(College of Zijin Mining,Fuzhou University,Fuzhou 350108,China;State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Resources,Zijin Mining Group Co.,Ltd.,Shanghang 364200,China)

机构地区：[1]福州大学紫金矿业学院,福建福州350108 [2]紫金矿业集团股份有限公司低品位难处理黄金资源综合利用国家重点实验室,福建上杭364200

出　　处：《金属矿山》2021年第8期76-81,共6页Metal Mine

基　　金：国家自然科学基金项目(编号:51504071);福建省中青年教师教育科研项目(编号:JT180062);国家级大学生创新创业训练计划项目(编号:202010386028)。

摘　　要：为了改善细菌对含砷铜矿的浸出效果,考察了添加Ag^(+)对细菌浸矿过程的影响。监测不同Ag^(+)浓度条件下,细菌浸矿过程中的pH值、Eh值的变化和铜、砷浸出率,并对浸出渣进行X射线光电子能谱(XPS)分析。研究结果表明:在pH值为1.8,Fe^(2+)浓度为0.5 g/L,Ag、浓度为5 mg/L的条件下,含砷铜矿浸出15 d后,铜和砷的浸出率最高,分别为43.83%和6.01%;在Ag^(+)浓度为0-7 mg/L范围内,随着Ag^(+)浓度的增大,浸出渣表面Fe(Ⅲ)-(硫酸盐)、S^(0)和S_n^(2-)的含量逐渐减小,砷酸盐含量变化不大;Ag^(+)的加入可以有效抑制黄钾铁矾、S^(0)和S_n^(2-)等钝化膜的生成,对非晶态砷酸铁的生成影响不显著。In order to improve the leaching effect of copper ore containing arsenic by bacteria,the influence of adding Ag^(+)on the bioleaching process was investigated.The changes of pH and Eh and the leaching rates of copper and arsenic in the bioleaching process were monitored under different Ag^(+)concentrations,and the leaching residue was analyzed by X-ray photoelectron spectroscopy(XPS).The results showed that:under the conditions of pH value of 1.8,Fe^(2+)concentration of 0.5 g/L and Ag^(+)concentration of 5 mg/L,the leaching rates of copper and arsenic were the highest,43.8%and 6.01%respective⁃ly,after 15 days of bioleaching;In the range of Ag^(+)concentration from 0 to 7 mg/L,with the increase of Ag^(+)concentration,the contents of Fe(Ⅲ)-(sulfate),S0 and Sn2-on the residue surface gradually decreased,while the content of arsenate changed little.The addition of Ag^(+)can effectively inhibit the formation of passive films of jarosite,S0 and Sn2-,but it had no significant effect on the formation of amorphous iron arsenate.

关 键 词：含砷铜矿 银离子 生物浸出 XPS 

分 类 号：TD925.5[矿业工程—选矿]