Extraction of manganese from electrolytic manganese residue by bioleaching

• DOI: 10.1016/j.biortech.2010.09.107
• Publication Date: 2010-10-04T09:38:46Z
• Authors: Baoping Xin; Bing Chen; Ning Duan; Changbo Zhou
• Keywords: Manganese; Time Factors; Acidithiobacillus; Iron; Industrial Waste; Hydrogen-Ion Concentration; Sulfides; 01 natural sciences; Electrolysis; 3. Good health; Biodegradation, Environmental; X-Ray Diffraction; Microscopy, Electron, Scanning; Oxidation-Reduction; Environmental Restoration and Remediation; Sulfur; 0105 earth and related environmental sciences

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.