Extraction of manganese from electrolytic manganese residue by bioleaching.
Extraction of manganese from electrolytic manganese residues using bioleaching was investigated in this paper. The maximum extraction efficiency of Mn was 93% by sulfur-oxidizing bacteria at 4.0 g/l sulfur after bioleaching of 9days, while the maximum extraction efficiency of Mn was 81% by pyrite-leaching bacteria at 4.0 g/l pyrite. The series bioleaching first by sulfur-oxidizing bacteria and followed by pyrite-leaching bacteria evidently promoted the extraction of manganese, witnessing the maximum extraction efficiency of 98.1%. In the case of sulfur-oxidizing bacteria, the strong dissolution of bio-generated sulfuric acid resulted in extraction of soluble Mn2+, while both the Fe2+ catalyzed reduction of Mn4+ and weak acidic dissolution of Mn2+ accounted for the extraction of manganese with pyrite-leaching bacteria. The chemical simulation of bioleaching process further confirmed that the acid dissolution of Mn2+ and Fe2+ catalyzed reduction of Mn4+ were the bioleaching mechanisms involved for Mn extraction from electrolytic manganese residues.
School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing, China. xinbaoping@bit.edu.cn
Baoping
B
Xin
Bing
B
Chen
Ning
N
Duan
Changbo
C
Zhou
D042763:Acidithiobacillus / Q000378:metabolism; D001673:Biodegradation, Environmental; D004572:Electrolysis; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000032:analysis*; D007501:Iron / Q000302:isolation & purification; D008345:Manganese / Q000302:isolation & purification*; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D013440:Sulfides / Q000302:isolation & purification; D013455:Sulfur / Q000378:metabolism; D013997:Time Factors; D014961:X-Ray Diffraction
D007220:Industrial Waste; D013440:Sulfides; C011342:pyrite; D008345:Manganese; D013455:Sulfur; D007501:Iron