Bioleaching of zinc and manganese from spent Zn-Mn batteries and mechanism exploration.
In this work, bioleaching was used to extract valuable Zn and Mn from spent Zn-Mn batteries. The results showed that 96% of Zn extraction was achieved within 24h regardless of energy source types and bioleaching bacteria species. However, initial pH had a remarkable influence on Zn release, extraction dose sharply decreased from 2200 to 500mg/l when the initial pH value increased from 1.5 to 3.0 or higher. In contrast to Zn, all the tested factors evidently affected Mn extraction; the maximum released dose of 3020mg/l was obtained under the optimum conditions. The acidic dissolution by biogenic H(2)SO(4) by the non-contact mechanism was responsible for Zn extraction, while Mn extraction was owed to both contact/biological and non-contact mechanisms. The combined action of acidic dissolution of soluble Mn(2+) by biogenic H(2)SO(4) and reductive dissolution of insoluble Mn(4+) by Fe(2+) resulted in 60% of Mn extraction, while contact of microbial cells with the spent battery material and incubation for more than 7days was required to achieve the maximum extraction of Mn.
School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, PR China. xinbaoping@bit.edu.cn
Baoping
B
Xin
Wenfeng
W
Jiang
Hina
H
Aslam
Kai
K
Zhang
Changhao
C
Liu
Renqing
R
Wang
Yutao
Y
Wang
D056450:Alicyclobacillus / Q000378:metabolism*; D001673:Biodegradation, Environmental; D011211:Electric Power Supplies; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D008345:Manganese / Q000032:analysis*; D008855:Microscopy, Electron, Scanning; D010100:Oxygen / Q000032:analysis; D013052:Spectrometry, X-Ray Emission; D013816:Thermodynamics; D013997:Time Factors; D014961:X-Ray Diffraction; D015032:Zinc / Q000032:analysis*
D008345:Manganese; D015032:Zinc; D010100:Oxygen