New understanding on separation of Mn and Fe from ferruginous manganese ores by the magnetic reduction roasting process

被引：57

作者：

Liu, Bingbing ^{[1
]}

Zhang, Yuanbo ^{[1
]}

Wang, Juan ^{[1
]}

Wang, Jia ^{[1
]}

Su, Zijian ^{[1
]}

Li, Guanghui ^{[1
]}

Jiang, Tao ^{[1
]}

机构：

[1] Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2018年 / 444卷

关键词：

Ferruginous manganese ores; Magnetic reduction roasting; Separation; Interface reaction; Phase transformation; Magnetism; HYDROGEN GAS-MIXTURE; OXIDE ORES; AIR ATMOSPHERE; IRON; EXTRACTION; RECOVERY; METHANE; CARBONATE; MECHANISM; FE2O3;

D O I：

10.1016/j.apsusc.2018.02.234

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Magnetic reduction roasting followed by magnetic separation process is reported as a simple route to realize separation of Mn and Fe from ferruginous manganese ores (Fe-Mn ores). However, the separation and recovery of Mn and Fe oxides are not very effective. This work clarified the underlying reason for the poor separation and also proposed some suggestions for the magnetic reduction process. In this work, the effect of temperature on the magnetic reduction roasting - magnetic separation of Fe-Mn ore was investigated firstly. Then the reduction behaviors of MnO2-Fe2O3 system and MnO2-Fe2O3-10 wt.% SiO2 system under 10 vol.% CO-90 vol.% CO2 at 600-1000 degrees C were investigated by XRD, XPS, SEM-EDS, VSM, DSC and thermodynamics analyses. Reduction and separation tests showed that higher reduction temperature was beneficial to the recovery of iron while it's not in favor of the recovery of manganese when the temperature was over 800 degrees C. The formation of composite oxide MnxFe3-xO4 with strong magnetism between the interface of the MnO2 and Fe2O3 particles leaded to the poor separation of iron and manganese. In addition, the formation mechanism of MnxFe3-xO4 from MnO2 and Fe2O3 as well as the interface reaction reduced under 10 vol.% CO was discussed in this study. Finally, some suggestions were recommended for the magnetic reduction roasting for utilizing the Fe-Mn ores effectively. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：133 / 144

页数：12

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