University of Oulu

Liu, D., Gao, L., Chen, G., Zhou, J., Guo, S., Omran, M., & Chen, J. (2022). Enhancement effects of distiller’s dried grains as reducing agents on the kinetics and leaching of pyrolusite from manganese ore. Journal of Materials Research and Technology, 19, 4270–4281.

Enhancement effects of distiller's dried grains as reducing agents on the kinetics and leaching of pyrolusite from manganese ore

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Author: Liu, Dongjie1; Gao, Lei1; Chen, Guo1,2;
Organizations: 1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, PR China
2Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Yunnan Minzu University, Kunming 650500, PR China
3Process Metallurgy Research Group, Faculty of Technology, University of Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.3 MB)
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Language: English
Published: Elsevier, 2022
Publish Date: 2022-11-04


To solve the problem of environmental pollution, Distiller’s dried grains (DDGS), a biomass, is used as a clean reducing agent for the leaching process of pyrolusite. Experimental results have shown that the leaching rate of manganese can reach 92.1% with the optimized conditions including a sulfuric acid concentration of 3.5 mol/L, a DDGS to pyrolusite ratio of 0.4, a liquid–solid ratio of 3 mL/g, a temperature of 363K, a time of 3 h, and a rotation speed of 400 rpm. This article explored the mechanism of the entire leaching process: the crude fiber in DDGS is hydrolyzed into reducing sugars, and the MnO₂ in pyrolusite undergoes an oxidation–reduction reaction to generate Mn²⁺ and studied the kinetics of the leaching process following the unreacted shrinkage nuclear reaction model controlled by the surface chemical reaction (\(1-(1-X)^{1/3}=\text{kt}\)). The equation of leaching kinetics is \(1−1-\text{X}^{\frac{1}{3}} = 3738.06 \cdot [\text{H}_{2}\text{SO}_{4}]^{0.57} \cdot \left[\frac{L}{S}\right]^{0.78} \cdot \left[\frac{DDGS}{\text{pyrolusite}}\right]^{0.25} \cdot [rpm]^{0.09} \cdot \exp(-48.448/(RT)\) This work provides a green and effective leaching process for the leaching of pyrolusite.

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Series: Journal of materials research and technology
ISSN: 2238-7854
ISSN-E: 2214-0697
ISSN-L: 2238-7854
Volume: 19
Pages: 4270 - 4281
DOI: 10.1016/j.jmrt.2022.07.005
Type of Publication: A1 Journal article – refereed
Field of Science: 1172 Environmental sciences
Funding: Financial supports from the National Natural Science Foundation of China (No: U1802255), and Innovative Research Team (in Science and Technology) in University of Yunnan Province were sincerely acknowledged.
Copyright information: © 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (