软锰矿还原焙烧过程中物相转化精准调控

王若枫; 高鹏; 袁帅; 李艳军; 刘应志; 黄成

doi:10.1007/s12613-023-2688-4

Volume 31 Issue 1

Jan. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(1): 81-90

Ruofeng Wang, Peng Gao, Shuai Yuan, Yanjun Li, Yingzhi Liu, and Cheng Huang, Precise regulation of the phase transformation for pyrolusite during the reduction roasting process, Int. J. Miner. Metall. Mater., 31(2024), No. 1, pp. 81-90. https://doi.org/10.1007/s12613-023-2688-4

Cite this article as:

Ruofeng Wang, Peng Gao, Shuai Yuan, Yanjun Li, Yingzhi Liu, and Cheng Huang, Precise regulation of the phase transformation for pyrolusite during the reduction roasting process, Int. J. Miner. Metall. Mater., 31(2024), No. 1, pp. 81-90. https://doi.org/10.1007/s12613-023-2688-4

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研究论文

软锰矿还原焙烧过程中物相转化精准调控

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:
高鹏 E-mail: gaopeng@mail.neu.edu.cn

文章亮点

(1) 提出了软锰矿矿物物相精准转化新技术；

(2) 探明了软锰矿物相及微观结构演化规律；

(3) 阐明了软锰矿还原反应历程及反应机理。

中文摘要

为实现低品位复杂锰矿资源高效利用，本文提出了矿物物相精准转化新技术，通过矿物物相精准转化技术将软锰矿转化高活性方锰矿，并系统研究了矿相转化过程中矿物物相转变机理。软锰矿在焙烧时间25 min、焙烧温度700°C、CO浓度20at%、总气量500 mL·min⁻¹条件下，可获得二价锰占有率95.30%的焙烧产品，焙烧产品中的锰矿物主要以方锰矿的形式存在。利用扫描电镜和BET比表面积测试法研究了焙烧产品的微观结构演变规律，查明了软锰矿的还原从颗粒表面到内核逐步进行反应历程；采用热力学计算、X射线光电子能谱和X射线衍射分析，明确了软锰矿焙烧过程中的元素价态变化及矿物物相转变历程。

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Research Article

Precise regulation of the phase transformation for pyrolusite during the reduction roasting process

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Abstract

Abstract

The mechanism involved in the phase transformation process of pyrolusite (MnO₂) during roasting in a reducing atmosphere was systematically elucidated in this study, with the aim of effectively using low-grade complex manganese ore resources. According to single-factor experiment results, the roasted product with a divalent manganese (Mn²⁺) distribution rate of 95.30% was obtained at a roasting time of 25 min, a roasting temperature of 700°C, a CO concentration of 20at%, and a total gas volume of 500 mL·min⁻¹, in which the manganese was mainly in the form of manganosite (MnO). Scanning electron microscopy and Brunauer–Emmett–Teller theory demonstrated the microstructural evolution of the roasted product and the gradual reduction in the pyrolusite ore from the surface to the core. Thermodynamic calculations, X-ray photoelectron spectroscopy, and X-ray diffractometry analyses determined that the phase transformation of pyrolusite followed the order of MnO₂→Mn₂O₃→Mn₃O₄→MnO phase by phase, and the reduction of manganese oxides in each valence state proceeded simultaneously.
- pyrolusite;
- phase transformation;
- reduction roasting;
- microstructural evolution;
- reaction mechanism

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