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Journal of Electrochemistry ›› 2014, Vol. 20 ›› Issue (3): 282-287.doi: 10.13208/j.electrochem.130903

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Key Factors and Techno-Economic Analyses of Manganese Electrolysis Process

HAN Gui-mei, XU Fu-yuan*, JIANG Lin-hua, DAN Zhi-gang, GAO Xiao-juan, DUAN Ning   

  1. Chinese Research Academy of Environment Sciences, Beijing 100012, China
  • Received:2013-09-03 Revised:2013-11-14 Online:2014-06-28 Published:2013-12-05
  • Contact: XU Fu-yuan E-mail:fuyuanxu@hotmail.com

Abstract: This paper first studied the key factors affecting the initial manganese electrolysis process, including concentration of Mn2+, electrolysis time, overpotential, and then optimized these processing parameters with the chronocoulometry method under a three-electrode system. The results showed that, during the initial manganese electrolysis process, hydrogen evolution occurred more significantly on the stainless steel surface. As electrolysis process continued, manganese covered the stainless steel surface gradually, and hydrogen evolution reaction restrained which all contributed to the higher current efficiency. Besides, the limiting current density appeared at high overpotential region, and the reaction was controlled by diffusion process. In 0.02 g·L-1 SeO2 solution system with 40 g·L-1 Mn2+ and 120 g·L-1 (NH4)2SO4, electrolysis time of 0.5 h overpotential of 0.151 V, bath temperature of 40 oC, pH of 6.6, the current efficiency was achieved as high as 95.3%. And an efficiency of 81.4% was also realized in the industrialized electrolyte system, which was 15% higher as compared to the previous operation parameters under the same electrolyte system.

Key words: manganese, electrolysis, electrochemical, current efficiency

CLC Number: