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%.

GRAPHICAL ABSTRACT

KEYWORDS:

• Manganese
• electrolytic manganese residue
• leaching
• electro-reduction
• electric field

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Correction

Disclosure statement

No potential conflict of interest was reported by the authors.

Correction Statement

This article was originally published with errors, which have now been corrected in the online version. Please see Correction (http://dx.doi.org/10.1080/09593330.2016.1245789)

Additional information

Funding

This project was supported by the National Natural Science Foundation of China (Nos. 51274261 and 51404043), the Chongqing University Postgraduates’ Innovation Project (2015), Key Project of Basic Science and Research in Cutting-edge Technologies of Chongqing, China (cstc2015jcyjBX0074), and the National Science-Technology Support Plan Projects (No. 2015BAB17B01).