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

被引:5
|
作者
Wang, Ruofeng [1 ,2 ]
Gao, Peng [1 ,2 ]
Yuan, Shuai [1 ,2 ]
Li, Yanjun [1 ,2 ]
Liu, Yingzhi [1 ,2 ]
Huang, Cheng [1 ,2 ]
机构
[1] Northeastern Univ, Sch Resources & Civil Engn, Shenyang 110819, Peoples R China
[2] Natl Local Joint Engn Res Ctr High Efficient Explo, Shenyang 110819, Peoples R China
基金
中国国家自然科学基金;
关键词
pyrolusite; phase transformation; reduction roasting; microstructural evolution; reaction mechanism; LOW-GRADE PYROLUSITE; MANGANESE ORES; RECOVERY; IRON; EXTRACTION; SEPARATION; BEHAVIOR; ACID; MN;
D O I
10.1007/s12613-023-2688-4
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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 degrees C, a CO concentration of 20at%, and a total gas volume of 500 mL center dot 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.
引用
收藏
页码:81 / 90
页数:10
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