University of Oulu

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.

Enhanced leaching of zinc from zinc-containing metallurgical residues via microwave calcium activation pretreatment

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Author: Ma, Aiyuan1,2; Zheng, Xuemei1,2; Gao, Lei3,4;
Organizations: 1School of Chemistry and Materials Engineering, Liupanshui Normal University, Liupanshui 553004, China
2Guizhou Provincial Key Laboratory of Coal Clean Utilisation, Liupanshui 553004, China
3Kunming Key Laboratory of Energy Materials Chemistry, Yunnan Minzu University, Kunming 650500, China
4Key Laboratory of Green-Chemistry Materials, University of Yunnan Province, Kunming 650106, China
5Key Laboratory of Aerospace Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, China
6Process Metallurgy Research Group, Faculty of Technology, University of Oulu, 90014 Oulu, Finland
7Central Metallurgical Research and Development Institute (CMRDI), Cairo 11421, Egypt
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 8.6 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2021
Publish Date: 2022-02-04


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.

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Series: Metals
ISSN: 2075-4701
ISSN-E: 2075-4701
ISSN-L: 2075-4701
Volume: 11
Issue: 12
Article number: 1922
DOI: 10.3390/met11121922
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: This work was supported by the Guizhou Province Science and Technology Project (No. [2019]1444, No. [2020]2001), the Guizhou Provincial Colleges and Universities Science and Technology Talent Project (KY [2020]124), the Science and Technology Innovation Group of Liupanshui Normal University (LPSSYKJTD201801), the Key cultivation disciplines of Liupanshui Normal University (LPSSYZDXK202001).
Copyright information: © 2021 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 (CC BY) license (