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  • CN 62-1112/TF 
  • ISSN 1005-2518 
  • Founded in 1988
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Effects of Initial pH on ASH-07 Bacterial Growth and Chalcopyrite Bio-leaching Process

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  • 1.Liaoning Shihua University,Fushun    113001,Liaoning,China;2.Northeastern University,Shenyang    110819,Liaoning,China

Received date: 2017-07-11

  Revised date: 2017-11-21

  Online published: 2018-05-19

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.

Cite this article

PAN Haodan1,2,YANG Hongying,TONG Linlin,LI Chengzhuo,DU Shilin,HAN Xinyi,HAN Shuang . Effects of Initial pH on ASH-07 Bacterial Growth and Chalcopyrite Bio-leaching Process[J]. Gold Science and Technology, 2018 , 26(1) : 115 -123 . DOI: 10.11872/j.issn.1005-2518.2018.01.115

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