title: Metallic ions catalysis for improving bioleaching yield of Zn and Mn from spent Zn-Mn batteries at high pulp density of 10.
abstract: Bioleaching of spent batteries was often conducted at pulp density of 1.0% or lower. In this work, metallic ions catalytic bioleaching was used for release Zn and Mn from spent ZMBs at 10% of pulp density. The results showed only Cu(2+) improved mobilization of Zn and Mn from the spent batteries among tested four metallic ions. When Cu(2+) content increased from 0 to 0.8 g/L, the maximum release efficiency elevated from 47.7% to 62.5% for Zn and from 30.9% to 62.4% for Mn, respectively. The Cu(2+) catalysis boosted bioleaching of resistant hetaerolite through forming a possible intermediate CuMn2O4 which was subject to be attacked by Fe(3+) based on a cycle of Fe(3+)/Fe(2+). However, poor growth of cells, formation of KFe3(SO4)2(OH)6 and its possible blockage between cells and energy matters destroyed the cycle of Fe(3+)/Fe(2+), stopping bioleaching of hetaerolite. The chemical reaction controlled model fitted best for describing Cu(2+) catalytic bioleaching of spent ZMBs.
authors.affiliation: School of chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, PR China; School of Petroleum and Environment Engineering, Yanan University, Yanan 716000, PR China.
authors.forename: Zhirui
authors.initials: Z
authors.lastname: Niu
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China.
authors.forename: Qifei
authors.initials: Q
authors.lastname: Huang
authors.affiliation: School of chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, PR China.
authors.forename: Jia
authors.initials: J
authors.lastname: Wang
authors.affiliation: School of chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, PR China.
authors.forename: Yiran
authors.initials: Y
authors.lastname: Yang
authors.affiliation: School of chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, PR China. Electronic address: xinbaoping@bit.edu.cn.
authors.forename: Baoping
authors.initials: B
authors.lastname: Xin
authors.affiliation: School of chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, PR China.
authors.forename: Shi
authors.initials: S
authors.lastname: Chen
mesh_terms: D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D002384:Catalysis; D011211:Electric Power Supplies; D004566:Electrodes; D007220:Industrial Waste / Q000032:analysis*; D007501:Iron / Q000737:chemistry; D008345:Manganese / Q000737:chemistry*; D008670:Metals / Q000737:chemistry*; D014871:Water Microbiology; D014874:Water Pollutants, Chemical; D015032:Zinc / Q000737:chemistry*
chemical_list: D007220:Industrial Waste; D008670:Metals; D014874:Water Pollutants, Chemical; D008345:Manganese; D007501:Iron; D015032:Zinc
keywords: Bioleaching; High pulp density; Metallic ions catalysis; Recovery; Spent Zn–Mn batteries; Valuable metals