University of Oulu

Kauppinen, T., Vielma, T., Salminen, J., & Lassi, U. (2020). Selective Recovery of Manganese from Anode Sludge Residue by Reductive Leaching. ChemEngineering, 4(2), 40. doi:10.3390/chemengineering4020040

Selective recovery of manganese from anode sludge residue by reductive leaching

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Author: Kauppinen, Toni1; Vielma, Tuomas1; Salminen, Justin2;
Organizations: 1Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 3000, FI-90570 Oulu, Finland
2Boliden Kokkola, Sinkkiaukio 1, FI-67100 Kokkola, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 4.4 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2020
Publish Date: 2020-07-03


Manganese-containing anode sludge is a common side-product in the electrowinning of zinc. The anode sludge consists mainly of oxidized manganese, but also lesser amounts of lead, calcium, and other minor metals. The impurities present in the anode sludge mandate new recycling strategies for its efficient use. This work demonstrates a novel method for selective manganese recovery from lead- and calcium-bearing manganese oxide solid residue. Leaching with sulfuric acid in the presence of a selected reducing agent, such as hydrogen peroxide or citric acid, yields a concentrated MnSO4 solution with high selectivity over calcium and lead. Manganese yields up to 98% can be obtained. Minimization of calcium and lead in final manganese product can be accomplished with the correct choice of leaching conditions. Alongside manganese sulfate solution, leaching residue with high content of lead and silver was also formed.

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Series: ChemEngineering
ISSN: 2305-7084
ISSN-E: 2305-7084
ISSN-L: 2305-7084
Volume: 4
Issue: 2
Article number: 40
DOI: 10.3390/chemengineering4020040
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Funding: This research was funded by Central Ostrobothnia Region, Saostus (A71944), Tekes, AdChem (1792/31/2016) and Business Finland, SYMMET (4236/31/2018).
Copyright information: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (