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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (1): 115-123.doi: 10.11872/j.issn.1005-2518.2018.01.115

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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

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)

CLC Number: 

  • TF811
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