Purification of Zinc from the Bioleaching Solution of a Bulk Lead–Zinc Concentrate by Precipitation and Solvent Extraction

Mosayeb Ahmadi, Mohammad Raouf Hosseini, Ali Ahmadi, Saeid Zandevakili

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Abstract

Bioleaching, in combination with the solvent extraction (SX) method, can be implemented to extract metals from mineral resources. The leachate obtained from the continuous bioleaching of a bulk lead–zinc concentrate was subjected to the purification studies. Firstly, 83% of the iron content of the leachate was removed using the jarosite precipitation method. Then, Di-(2-ethylhexyl) phosphoric acid (D2EHPA) extractant was saponified by 25% using NaOH and diluted with kerosene to be applied in the solvent extraction studies. In the third step, SX optimization experiments were conducted to obtain the best values for the mixing time, pH, temperature, extractant percent, and O/A ratio. Finally, the McCabe–Thiele diagram was constructed at the optimized condition [12 min, pH 3.5, 25 °C, 30% Di-(2-ethylhexyl) phosphoric acid], and 99.9% zinc recovery was predicted after two extraction stages at the O/A ratio of 1. Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)1434-1439
Number of pages6
JournalJournal of Sustainable Metallurgy
Volume7
Issue number4
DOIs
Publication statusPublished - 23 Nov 2021
Externally publishedYes

Bibliographical note

The final publication is available at Springer via http://dx.doi.org/10.1007/s40831-021-00465-w

Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

This document is the author’s post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version may remain and you are advised to consult the published version if you wish to cite from it.

© 2021, The Minerals, Metals & Materials Society.

Funder

This study was funded by Bama Zinc and Lead Company, Isfahan, Iran.
The authors acknowledge the Bama Company for the financial funding of the analyses.

Keywords

  • Bioleaching
  • McCabe–Thiele
  • Saponification
  • Solvent extraction
  • Zinc

ASJC Scopus subject areas

  • Environmental Science (miscellaneous)
  • Mechanics of Materials
  • Metals and Alloys

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