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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

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Division of Sustainable Resources Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
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Department of Metallurgy and Mineral Processing, School of Mines, The University of Zambia, Lusaka P.O. Box 32379, Zambia
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Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
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School of Minerals and Energy Resources Engineering, The University of New South Wales, Sydney NSW 2052, Australia
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IWRM Centre/Geology Department, School of Mines, The University of Zambia, Lusaka P.O. Box 32379, Zambia
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Faculty of Veterinary Medicine, Hokkaido University, Kita 18, Nishi 9, Kita-Ku, Sapporo 060-0818, Japan
*
Author to whom correspondence should be addressed.
Metals 2020, 10(4), 531; https://doi.org/10.3390/met10040531
Received: 2 April 2020 / Revised: 17 April 2020 / Accepted: 18 April 2020 / Published: 20 April 2020
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 and separated before the solid-liquid separation, hence, eliminating the need for extensive washing of the generated residues to remove the inherent residual solution. View Full-Text
Keywords: lead; zinc; zinc plant leach residues; zero-valent aluminum; leaching; cementation lead; zinc; zinc plant leach residues; zero-valent aluminum; leaching; cementation
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MDPI and ACS Style

Silwamba, M.; Ito, M.; Hiroyoshi, N.; Tabelin, C.B.; Hashizume, R.; Fukushima, T.; Park, I.; Jeon, S.; Igarashi, T.; Sato, T.; Chirwa, M.; Banda, K.; Nyambe, I.; Nakata, H.; Nakayama, S.; Ishizuka, M. Recovery of Lead and Zinc from Zinc Plant Leach Residues by Concurrent Dissolution-Cementation Using Zero-Valent Aluminum in Chloride Medium. Metals 2020, 10, 531. https://doi.org/10.3390/met10040531

AMA Style

Silwamba M, Ito M, Hiroyoshi N, Tabelin CB, Hashizume R, Fukushima T, Park I, Jeon S, Igarashi T, Sato T, Chirwa M, Banda K, Nyambe I, Nakata H, Nakayama S, Ishizuka M. Recovery of Lead and Zinc from Zinc Plant Leach Residues by Concurrent Dissolution-Cementation Using Zero-Valent Aluminum in Chloride Medium. Metals. 2020; 10(4):531. https://doi.org/10.3390/met10040531

Chicago/Turabian Style

Silwamba, Marthias; Ito, Mayumi; Hiroyoshi, Naoki; Tabelin, Carlito B.; Hashizume, Ryota; Fukushima, Tomoki; Park, Ilhwan; Jeon, Sanghee; Igarashi, Toshifumi; Sato, Tsutomu; Chirwa, Meki; Banda, Kawawa; Nyambe, Imasiku; Nakata, Hokuto; Nakayama, Shouta; Ishizuka, Mayumi. 2020. "Recovery of Lead and Zinc from Zinc Plant Leach Residues by Concurrent Dissolution-Cementation Using Zero-Valent Aluminum in Chloride Medium" Metals 10, no. 4: 531. https://doi.org/10.3390/met10040531

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