A1 Journal article (refereed), original research

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


Open Access hybrid publication


Publication Details

Authors: Jantunen Niklas, Kauppinen Toni, Salminen Justin, Virolainen Sami, Lassi Ulla, Sainio Tuomo

Publisher: Elsevier

Publication year: 2021

Language: English

Related journal or series: Minerals Engineering

Volume number: 173

ISSN: 0892-6875

eISSN: 1872-9444

JUFO level of this publication: 2

Digital Object Identifier (DOI): http://dx.doi.org/10.1016/j.mineng.2021.107200

Open Access: Open Access hybrid publication


Abstract

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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Last updated on 2021-08-11 at 09:18