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Recovery of Lead and Zinc from Zinc Plant Leach Residues by Concurrent Dissolution-Cementation Using Zero-Valent Aluminum in Chloride Medium by Silwamba, Marthias; Ito, Mayumi; Hiroyoshi, Naoki; Tabelin, Carlito Baltazar; Hashizume, Ryota; Fukushima, Tomoki; Park, Ilhwan; Jeon, Sanghee; Igarashi, Toshifumi; Sato, Tsutomu; Chirwa, Meki; Banda, Kawawa; Nyambe, Imasiku; Nakata, Hokuto; Nakayama, Shouta; Ishizuka, Mayumi is a Engineering article available to read on EtoBox.

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Zinc plant leach residues (ZPLRs) contain significant amounts of metal compounds of lead (Pb), zinc (Zn), iron (Fe), etc., hence, they are considered as a secondary source of metals. On the other hand, ZPLRs are regarded as hazardous materials because they contain heavy metals that pollute the environment. Resources and environmental concerns of ZPLRs were addressed in this study by removing/recovering Pb and Zn using a concurrent dissolution and cementation technique. To cement the dissolved Pb and Zn in leaching pulp, zero-valent aluminum (ZVAl) was added during ZPLRs leaching in the hydrochloric (HCl)–sodium chloride (NaCl) solution. The resulting cemented metals were agglomerated and separated by sieving. Lead removal increased with increasing both NaCl and HCl concentrations. However, when ZVAl was added, significant Pb removal was achieved at a low concentration. Zinc was not cemented out of the pulp using ZVAl and its recovery from ZPLRs was dependent on the HCl concentration only. By applying a concurrent dissolution and cementation technique, both Pb and Zn were removed using a low concentration of NaCl, and most importantly Pb—the most toxic metal in ZPLRs—was captured an

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Author

Silwamba, Marthias; Ito, Mayumi; Hiroyoshi, Naoki; Tabelin, Carlito Baltazar; Hashizume, Ryota; Fukushima, Tomoki; Park, Ilhwan; Jeon, Sanghee; Igarashi, Toshifumi; Sato, Tsutomu; Chirwa, Meki; Banda, Kawawa; Nyambe, Imasiku; Nakata, Hokuto; Nakayama, Shouta; Ishizuka, Mayumi

Publisher

MDPI AG; Multidisciplinary Digital Publishing Institute (MDPI); Basel: MDPI AG, 2011- (ISSN 2075-4701)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)