Journal
ENVIRONMENTAL TECHNOLOGY
Volume 38, Issue 16, Pages 2077-2084Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2016.1245789
Keywords
Manganese; electrolytic manganese residue; leaching; electro-reduction; electric field
Categories
Funding
- National Natural Science Foundation of China [51274261, 51404043]
- Chongqing University Postgraduates' Innovation Project
- Key Project of Basic Science and Research in Cutting-edge Technologies of Chongqing, China [cstc2015jcyjBX0074]
- National Science-Technology Support Plan Projects [2015BAB17B01]
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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/cm(2), 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%. [GRAPHICS] .
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