软锰矿氢基矿相转化精准调控机制研究

王若枫; 袁帅; 李艳军; 高鹏; 李儒

doi:10.1007/s12613-023-2819-y

Volume 31 Issue 11

Nov. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 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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研究论文

软锰矿氢基矿相转化精准调控机制研究

1)
东北大学资源与土木工程学院, 沈阳 110819, 中国
2)
难采选铁矿资源高效开发利用技术国家地方联合工程研究中心, 沈阳 110819, 中国

通讯作者:
袁帅 E-mail: yuanshuai_neu@163.com

文章亮点

(1) 论文提出了软锰矿氢基矿相转化新技术

(2) 阐明了软锰矿还原反应历程及反应机理

(3) 探究了软锰矿微观结构演化规律并建立了反应动力学模型

中文摘要

为实现复杂氧化锰矿资源高效清洁利用，论文提出氢基矿相转化技术处理软锰矿，以期高效转化为高活性方锰矿，为后续高效利用奠定基础。论文系统研究了氢基矿相转化过程中矿物物相转变机理并建立了锰矿物等温反应动力学模型。研究表明软锰矿在焙烧温度650°C，焙烧时间25 min，氢气浓度20%的反应条件下，可获得二价锰的占有率96.44%的转化产品，锰矿物主要以方锰矿的形式存在。通过研究软锰矿还原动力学及微观结构演变规律，揭示了方锰矿的生成机制，明确了最优反应动力学模型为随机成核与随后生长模型（n = 3/2），软锰矿的还原从颗粒表面到内核逐步进行，氢基矿相转化过程软锰矿反应主要历程为MnO₂ → Mn₂O₃ → Mn₃O₄ → MnO。研究成果为复杂氧化锰矿资源高效清洁利用提供理论基础。

关键词:

Research Article

Hydrogen-based mineral phase transformation mechanism investigation of pyrolusite ore

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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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