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Alkaline Leaching and Concurrent Cementation of Dissolved Pb and Zn from Zinc Plant Leach Residues

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Title: Alkaline Leaching and Concurrent Cementation of Dissolved Pb and Zn from Zinc Plant Leach Residues
Authors: Silwamba, Marthias Browse this author
Ito, Mayumi Browse this author
Hiroyoshi, Naoki Browse this author
Tabelin, Carlito Baltazar Browse this author
Hashizume, Ryota Browse this author
Fukushima, Tomoki Browse this author
Park, Ilhwan Browse this author
Jeon, Sanghee Browse this author
Igarashi, Toshifumi Browse this author
Sato, Tsutomu Browse this author
Nyambe, Imasiku Browse this author
Nakata, Hokuto Browse this author
Nakayama, Shouta Browse this author →KAKEN DB
Ishizuka, Mayumi Browse this author →KAKEN DB
Keywords: leaching
Al metal powder
zinc plant leach residues
Issue Date: 23-Mar-2022
Publisher: MDPI
Journal Title: Minerals
Volume: 12
Issue: 4
Start Page: 393
Publisher DOI: 10.3390/min12040393
Abstract: Zinc plant leach residues (ZPLRs), particularly those produced using old technologies, have both economic importance as secondary raw materials and have environmental impacts because they contain hazardous heavy metals that pose risks to human health and the environment. Therefore, the extraction and recovery of these metals from ZPLRs has both economic and environmental benefits. In this study, we investigated the removal of lead (Pb) and zinc (Zn) from ZPLRs by alkaline (NaOH) leaching and the concurrent cementation of dissolved Pb and Zn using aluminum (Al) metal powder. The effects of the leaching time, NaOH concentration, solid-to-liquid ratio (S/L), and dosage of Al metal powder on the extraction of Pb and Zn were investigated. Pb and Zn removal efficiencies increased with increasing NaOH concentrations and decreasing S/Ls. The Pb and Zn removal efficiencies were 62.2% and 27.1%, respectively, when 2.5 g/50 mL (S/L) of ZPLRs were leached in a 3 M NaOH solution for 30 min. The extraction of Pb and Zn could be attributed to the partitioning of these metals in relatively more mobile phases-water-soluble, exchangeable, and carbonate phases-in ZPLRs. Around 100% of dissolved Pb and less than 2% of dissolved Zn were cemented in leaching pulp when Al metal powder was added. Minerals in the solid residues, particularly iron oxides minerals, were found to suppress the cementation of extracted Zn in leaching pulp, and when they were removed by filtration, Zn was recovered by Al metal powder via cementation.
Rights: © 2022 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 License (
Type: article
Appears in Collections:獣医学院・獣医学研究院 (Graduate School of Veterinary Medicine / Faculty of Veterinary Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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