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Article

Enhanced Leaching of Zinc from Zinc-Containing Metallurgical Residues via Microwave Calcium Activation Pretreatment

by 1,2, 1,2, 3,4, 3,4,5,*, 6,7,* and 3,4,*
1
School of Chemistry and Materials Engineering, Liupanshui Normal University, Liupanshui 553004, China
2
Guizhou Provincial Key Laboratory of Coal Clean Utilisation, Liupanshui 553004, China
3
Kunming Key Laboratory of Energy Materials Chemistry, Yunnan Minzu University, Kunming 650500, China
4
Key Laboratory of Green-Chemistry Materials, University of Yunnan Province, Kunming 650106, China
5
Key Laboratory of Aerospace Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, China
6
Process Metallurgy Research Group, Faculty of Technology, University of Oulu, 90014 Oulu, Finland
7
Central Metallurgical Research and Development Institute (CMRDI), Cairo 11421, Egypt
*
Authors to whom correspondence should be addressed.
Academic Editor: Jean François Blais
Metals 2021, 11(12), 1922; https://doi.org/10.3390/met11121922
Received: 26 October 2021 / Revised: 19 November 2021 / Accepted: 19 November 2021 / Published: 28 November 2021
(This article belongs to the Section Extractive Metallurgy)
Given the shortage of zinc resource, the low utilisation efficiency of secondary zinc resource, and the crucial problem that the synchronous dissolution of zinc from different mineral phases, an activation pretreatment method merged with calcium activation and microwave heating approach was proposed to enhance the zinc leaching from complex encapsulated zinc-containing metallurgical residues (ZMR). Results indicated that under the optimal pretreatment conditions, including microwave activation temperature of 400 °C, CaO addition of 25% and activation time of 20 min, the zinc leaching rate reached 91.67%, which was 3.9% higher than that by conventional roasting pretreatment. Meanwhile, microwave heating presents excellent treatment effects, manifested by the zinc leaching rates, all exceeding that of conventional roasting under the same conditions, while the process temperature is decreased by 200 °C. In addition, XRD and SEM-EDS analysis denoted that microwave calcification pretreatment can effectively promote the transformation of the refractory zinc minerals like Zn2SiO4 and ZnFe2O4 into the easily leachable zinc oxides. The distinctive selective heating characteristics of microwave heating strengthened the dissociation of mineral inclusion, and the generated cracks increased the interfacial reaction area and further enhancing the leaching reaction of zinc from ZMR. View Full-Text
Keywords: zinc-containing metallurgical residues; calcium activation; microwave heating; enhanced leaching zinc-containing metallurgical residues; calcium activation; microwave heating; enhanced leaching
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MDPI and ACS Style

Ma, A.; Zheng, X.; Gao, L.; Li, K.; Omran, M.; Chen, G. Enhanced Leaching of Zinc from Zinc-Containing Metallurgical Residues via Microwave Calcium Activation Pretreatment. Metals 2021, 11, 1922. https://doi.org/10.3390/met11121922

AMA Style

Ma A, Zheng X, Gao L, Li K, Omran M, Chen G. Enhanced Leaching of Zinc from Zinc-Containing Metallurgical Residues via Microwave Calcium Activation Pretreatment. Metals. 2021; 11(12):1922. https://doi.org/10.3390/met11121922

Chicago/Turabian Style

Ma, Aiyuan, Xuemei Zheng, Lei Gao, Kangqiang Li, Mamdouh Omran, and Guo Chen. 2021. "Enhanced Leaching of Zinc from Zinc-Containing Metallurgical Residues via Microwave Calcium Activation Pretreatment" Metals 11, no. 12: 1922. https://doi.org/10.3390/met11121922

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