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
|Author:||Kauppinen, Toni1; Vielma, Tuomas1; Salminen, Justin2;|
1Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 3000, FI-90570 Oulu, Finland
2Boliden Kokkola, Sinkkiaukio 1, FI-67100 Kokkola, Finland
|Online Access:||PDF Full Text (PDF, 4.4 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2020070346869
Multidisciplinary Digital Publishing Institute,
|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.
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
116 Chemical sciences
This research was funded by Central Ostrobothnia Region, Saostus (A71944), Tekes, AdChem (1792/31/2016) and Business Finland, SYMMET (4236/31/2018).
© 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 (http://creativecommons.org/licenses/by/4.0/).