Effects of Initial pH on ASH-07 Bacterial Growth and Chalcopyrite Bio-leaching Process
Received date: 2017-07-11
Revised date: 2017-11-21
Online published: 2018-05-19
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.
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
/
〈 | 〉 |