University of Oulu

Du, J., Zhang, Y., Lu, J., Chen, J., Gao, L., Guo, S., Omran, M., & Chen, G. (2023). Mechanism of enhanced enrichment manganese from manganese ore-pyrite under microwave heating: Process optimization and kinetic studies. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 656, 130534.

Mechanism of enhanced enrichment manganese from manganese ore-pyrite under microwave heating : process optimization and kinetic studies

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Author: Du, Jinjia1; Zhang, Yanqiong1; Lu, Jiajia1;
Organizations: 1Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Yunnan Minzu University, Kunming 650500, China
2Faculty of Technology, University of Oulu, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: Elsevier, 2023
Publish Date: 2024-11-07


Realizing efficient leaching of manganese elements from low-grade manganese ore is crucial from a strategic perspective to address the insufficient supply of high-grade manganese ore resources. Meanwhile, energy and environmental issues are becoming increasingly crucial under carbon neutrality. This work introduced microwave technology into the low-grade manganese ore leaching process, and the pyrite was used as a reducing agent. The leaching behavior of manganese by microwave leaching was investigated. The results showed that 98.6% Mn were leached using the microwave leaching method under optimal conditions: 400 rpm stirring rate, 1.5 M sulfuric acid concentration, a liquid-solid ratio of 10 mL/g, low-grade manganese ore-pyrite ratio of 10/2 and leaching time of 150 min. In contrast, about 92.0% Mn was achieved using conventional leaching methods. Moreover, the kinetic behavior of manganese leaching was studied using four unreacted shrinkage core models. The kinetics result indicated that the chemical reaction control model (1-(1-X)1/3 = k₁t) could be used to describe the microwave leaching process. These results have preliminary guidance for the production practice of microwave-assisted leaching of low-grade manganese ore.

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Series: Colloids and surfaces. A, Physicochemical and engineering aspects
ISSN: 0927-7757
ISSN-E: 1873-4359
ISSN-L: 0927-7757
Volume: 656
Issue: Part B
Article number: 130534
DOI: 10.1016/j.colsurfa.2022.130534
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: Financial support from the National Natural Science Foundation of China (No: U1802255) and the Innovative Research Team (in Science and Technology) in the University of Yunnan Province were sincerely acknowledged.
Copyright information: © 2022. This manuscript version is made available under the CC-BY-NC-ND 4.0 license