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黄金科学技术 ›› 2018, Vol. 26 ›› Issue (1): 115-123.doi: 10.11872/j.issn.1005-2518.2018.01.115

• 冶炼技术与装备研发 • 上一篇    下一篇

初始pH值对ASH-07细菌生长和黄铜矿浸出过程的影响

潘颢丹1,2,杨洪英2,佟琳琳2,李承卓1,杜世麟1,韩馨怡1,韩爽1   

  1. 1.辽宁石油化工大学,辽宁 抚顺 113001;
    2.东北大学,辽宁 沈阳 110819
  • 收稿日期:2017-07-11 修回日期:2017-11-21 出版日期:2018-02-28 发布日期:2018-05-19
  • 作者简介:潘颢丹(1983-),女,辽宁沈阳人,讲师,从事微生物稠油降黏研究工作。panhaodan@126.com
  • 基金资助:

    国家自然科学基金项目“含砷复杂金矿细菌氧化矿物界面能激起作用机制的基础研究”(编号:U1608254)、“难浸含砷金矿细菌氧化过程[AsS]2-→As(Ⅲ)→As(Ⅴ)转化机理研究”(编号:51374066)、辽宁省教育厅科学研究一般项目“生物表面活性剂在稠油讲解中的应用研究”(编号:L2016016),2016年大学生创新创业训练计划项目“数目类生物质的干燥实验研究”(编号:2016071)、“秸秆生物质干燥实验研究”(编号:2016079)和2017年大学生创新创业训练计划项目“生物质物料干燥和模型的建立”(编号:2017068)、“鸡类固废生物质的干燥箱实验研究”(编号:2017075)联合资助
     

Effects of Initial pH on ASH-07 Bacterial Growth and Chalcopyrite Bio-leaching Process

PAN Haodan 1,2,YANG Hongying 2,TONG Linlin 2,LI Chengzhuo 1,DU Shilin 1,HAN Xinyi 1,HAN Shuang 1   

  1. 1.Liaoning Shihua University,Fushun    113001,Liaoning,China;2.Northeastern University,Shenyang    110819,Liaoning,China
  • Received:2017-07-11 Revised:2017-11-21 Online:2018-02-28 Published:2018-05-19

摘要:

影响黄铜矿细菌浸出过程的因素很多,重点研究了初始pH值对浸矿细菌ASH-07生长活性、黄铜矿浸出效果和黄铜矿表面氧化膜成分的影响。不同初始pH值条件下细菌培养和黄铜矿浸出实验结果表明,在初始pH=1.2~1.8的条件下,细菌培养24 h后,即开始进入生长平衡期,浓度迅速升高至1.4×108 cell/mL,黄铜矿在浸出6 d后浸出率即达到45.0%左右;氧化膜成分XPS检测实验结果表明,在初始pH值为1.2的条件下,黄铜矿浸出168 h后,矿物表面氧化膜成分中未检测到钝化膜黄钾铁矾。因此,在采用浸矿菌种ASH-07浸出黄铜矿的实验中,最佳的初始pH值约为1.2,pH值低于1.2或高于1.8都不利于黄铜矿的生物浸出。

关键词: 初始pH值, 细菌生长, 黄铜矿, 生物浸出, 氧化膜, X射线光电子能谱(XPS)

Abstract:

Many factors affect the leaching processes of chalcopyrite.The effect of initial pH value on the activity of leaching bacteria ASH-07,the efficiency of the leaching result and compositions of the oxide film on the chalcopyrite surface were investigated.The results showed that the bacteria reached equilibrium phase and boomed to 1.4×108 cell/mL after cultured for 24 h on the condition of pH=1.2~1.8 after leaching for 6 d.The leaching efficiency rapidly reached approximately 45.0%.XPS analysis of the oxide film presented that no jarosite passive film was observed on the mineral surface after leaching for 168 h on the condition of initial pH=1.2. Therefore,the best initial pH value of approximately 1.2 was obtained for the chalcopyrite leaching with the leaching bacteria of ASH-07.It was not benefit for the bioleaching of the chalcopyrite when the pH value was lower than 1.2 or higher than 1.8.

Key words: initial pH value, bacteria growth, chalcopyrite, bioleaching, oxide film, X-ray Photoelectron Spectroscopy(XPS)

中图分类号: 

  • TF811
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