title: Leaching of manganese from electrolytic manganese residue by electro-reduction.
abstract: In this study, an improved process for leaching manganese from electrolytic manganese residue (EMR) by electro-reduction was developed. The mechanisms of the electro-reduction leaching were investigated through X-ray diffraction, scanning electron microscopy, X-ray fluorescence, and Brunauer Emmett Teller. The results show that the electric field could change the surface charge distribution of EMR particles, and the high-valent manganese can be reduced by electric field. The leaching efficient of manganese reached 84.1% under the optimal leaching condition: 9.2 wt% H2SO4, current density of 25 mA/cm2, solid-to-liquid ratio of 1:5, and leaching time for 1 h. It is 37.9% higher than that attained without an electric field. Meanwhile, the manganese content in EMR decreased from 2.57% to 0.48%.
authors: a School of Chemistry and Chemical Engineering , Chongqing University , Chongqing , People's Republic of China.|b Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization , Chongqing , People's Republic of China.
authors: Jiancheng
authors: http://orcid.org/0000-0003-1256-0294
authors: J
authors: Shu
authors: a School of Chemistry and Chemical Engineering , Chongqing University , Chongqing , People's Republic of China.|b Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization , Chongqing , People's Republic of China.
authors: Renlong
authors: http://orcid.org/0000-0001-8923-3561
authors: R
authors: Liu
authors: a School of Chemistry and Chemical Engineering , Chongqing University , Chongqing , People's Republic of China.|b Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization , Chongqing , People's Republic of China.
authors: Zuohua
authors: http://orcid.org/0000-0003-4229-0168
authors: Z
authors: Liu
authors: a School of Chemistry and Chemical Engineering , Chongqing University , Chongqing , People's Republic of China.|b Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization , Chongqing , People's Republic of China.
authors: Hongliang
authors: http://orcid.org/0000-0003-0141-1074
authors: H
authors: Chen
authors: a School of Chemistry and Chemical Engineering , Chongqing University , Chongqing , People's Republic of China.|b Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization , Chongqing , People's Republic of China.
authors: Changyuan
authors: http://orcid.org/0000-0002-5066-680X
authors: C
authors: Tao
mesh_terms: D004572:Electrolysis; D004573:Electrolytes; D007477:Ions; D008345:Manganese; D014961:X-Ray Diffraction
chemical_list: D004573:Electrolytes; D007477:Ions; D008345:Manganese
keywords: Manganese; electric field; electro-reduction; electrolytic manganese residue; leaching