University of Oulu

Niklas Jantunen, Toni Kauppinen, Justin Salminen, Sami Virolainen, Ulla Lassi, Tuomo Sainio, Separation of zinc and iron from secondary manganese sulfate leachate by solvent extraction, Minerals Engineering, Volume 173, 2021, 107200, ISSN 0892-6875,

Separation of zinc and iron from secondary manganese sulfate leachate by solvent extraction

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Author: Jantunen, Niklas1; Kauppinen, Toni2; Salminen, Justin3;
Organizations: 1LUT University, School of Engineering Science, Yliopistonkatu 34, 53850 Lappeenranta, Finland
2University of Oulu, Pentti Kaiteran katu 1, 90014 Oulu, Finland
3Boliden Kokkola Oy, Sinkkiaukio 1, 67900 Kokkola, Finland
4LUT University, School of Engineering Science, Mukkulankatu 19, 15210 Lahti, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.9 MB)
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Language: English
Published: Elsevier, 2021
Publish Date: 2021-11-12


Purification of concentrated manganese sulfate solution by solvent extraction is discussed in this paper. The use of bis(2-ethylhexyl) hydrogen phosphate (D2EHPA) and bis(2,4,4-trimethylpentyl)phosphinic acid (BTMPPA) was studied in removal of impurities from zinc electrowinning anode sludge leachates. Over 99 % of zinc and iron were removed by both extractants at around pH 3 in two mixer-settlers operating in continuous countercurrent mode at a solvent-to-feed (S/F) ratio of 0.43 and T = 22 ± 1 °C. BTMPPA had higher selectivity for zinc and iron over manganese than D2EHPA under all experimental conditions. Extraction of manganese was typically below 10 % and can be limited by crowding the extractants, since the fraction of manganese in both loaded extractants was decreased by decreasing organic to aqueous volumetric ratio (O/A). A significant amount of the co-extracted Mn was recovered by selective stripping with 0.5 M sulfuric acid. Extraction by BTMPPA was more sensitive to pH adjustment than extraction by D2EHPA. Increasing the mean residence time in mixer from 3.6 min to 6.0 min improved the removal of zinc and iron with BTMPPA but the change in residence time had little or no effect on zinc and iron removal with D2EHPA.

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Series: Minerals engineering
ISSN: 0892-6875
ISSN-E: 1872-9444
ISSN-L: 0892-6875
Volume: 173
Article number: 107200
DOI: 10.1016/j.mineng.2021.107200
Type of Publication: A1 Journal article – refereed
Field of Science: 215 Chemical engineering
Funding: The funding provided by Business Finland (decision numbers 4236/31/2018 and 4300/31/2018) as a part of SYMMET (Symbiosis of metals production and nature) consortium is gratefully acknowledged.
Copyright information: © 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (