Hydrogen-based mineral phase transformation mechanism investigation of pyrolusite ore

Ruofeng Wang; Shuai Yuan; Yanjun Li; Peng Gao; Ru Li

doi:10.1007/s12613-023-2819-y

Volume 31 Issue 11

Nov. 2024

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2024 > 31(11): 2445-2457

Ruofeng Wang, Shuai Yuan, Yanjun Li, Peng Gao, and Ru Li, Hydrogen-based mineral phase transformation mechanism investigation of pyrolusite ore, Int. J. Miner. Metall. Mater., 31(2024), No. 11, pp. 2445-2457. https://doi.org/10.1007/s12613-023-2819-y

Cite this article as:

Ruofeng Wang, Shuai Yuan, Yanjun Li, Peng Gao, and Ru Li, Hydrogen-based mineral phase transformation mechanism investigation of pyrolusite ore, Int. J. Miner. Metall. Mater., 31(2024), No. 11, pp. 2445-2457. https://doi.org/10.1007/s12613-023-2819-y

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Research Article

Hydrogen-based mineral phase transformation mechanism investigation of pyrolusite ore

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Corresponding author:
Shuai Yuan E-mail: yuanshuai_neu@163.com
Received: 3 October 2023; Revised: 21 December 2023; Accepted: 26 December 2023; Available online: 27 December 2023

Abstract

Abstract

Pyrolusite comprises the foremost manganese oxides and is a major source of manganese production. An innovative hydrogen-based mineral phase transformation technology to pyrolusite was proposed, where a 96.44% distribution rate of divalent manganese (Mn²⁺) was observed at an optimal roasting temperature of 650°C, a roasting time of 25 min, and an H₂ concentration of 20vol%; under these conditions. The manganese predominantly existed in the form of manganosite. This study investigated the generation mechanism of manganosite based on the reduction kinetics, phase transformation, and structural evolution of pyrolusite and revealed that high temperature improved the distribution rate, and the optimal kinetic model for the reaction was the random nucleation and growth model (reaction order, n = 3/2) with an activation energy (E_a) of 24.119 kJ·mol⁻¹. Throughout the mineral phase transformation, manganese oxide from the outer layer of particles moves inward to the core. In addition, pyrolusite follows the reduction sequence of MnO₂ → Mn₂O₃ → Mn₃O₄ → MnO, and the reduction of manganese oxides in each valence state simultaneously proceeds. These findings provide significant insight into the efficient and clean utilization of pyrolusite.
- reduction;
- pyrolusite;
- phase transformation;
- microstructural evolution

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