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Minerals 2017, 7(9), 167; doi:10.3390/min7090167

Carbothermic Reduction of Ferruginous Manganese Ore for Mn/Fe Beneficiation: Morphology Evolution and Separation Characteristic

1
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
2
Marketing Department, Shanxi Taigang Stainless Steel Co., Ltd., Taiyuan 030003, China
*
Author to whom correspondence should be addressed.
Received: 29 June 2017 / Revised: 3 September 2017 / Accepted: 4 September 2017 / Published: 11 September 2017
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Abstract

In the present paper, beneficiation of Fe and Mn elements from a ferruginous manganese ore via carbothermic reduction followed by magnetic separation process was investigated in detail. The effects of the experimental parameters were systematically discussed. Iron-rich products with an Fe grade of 62.3% and 88.2% of Fe recovery, and manganese-rich product with a Mn grade of 63.7% of and 70.4% of Mn recovery were obtained, respectively, at an optimal temperature of 1100 °C, with a roasting time of 100 min, anthracite addition of 25%, milling fineness of 90% passing 0.074 mm, and a magnetic intensity of 140 A/m. Furthermore, the morphology evolution and phase transformation laws along with reduction process were revealed by optical microscope, scanning electron microscope equipped with energy dispersive X-ray detector (SEM-EDX), X-ray diffraction (XRD), and chemical phase analysis. The results demonstrated that the ferruginous manganese ore reduction can be described as follows: plate-like Fe-Mn symbiotic phase decomposition → granular MnO phase formation → fine metallic iron formation → aggregation of metallic iron → boundary development between Fe and Mn phases. View Full-Text
Keywords: ferruginous manganese; carbothermic reduction; morphology evolution; phase transformation; Mn/Fe beneficiation; magnetic separation ferruginous manganese; carbothermic reduction; morphology evolution; phase transformation; Mn/Fe beneficiation; magnetic separation
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Yi, L.; Huang, Z.; Jiang, T.; Zhao, P.; Zhong, R.; Liang, Z. Carbothermic Reduction of Ferruginous Manganese Ore for Mn/Fe Beneficiation: Morphology Evolution and Separation Characteristic. Minerals 2017, 7, 167.

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