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Minerals 2017, 7(6), 86; doi:10.3390/min7060086

Coal-Based Reduction and Magnetic Separation Behavior of Low-Grade Vanadium-Titanium Magnetite Pellets

1
School of Metallurgy, Northeastern University, Shenyang 110819, China
2
Liaoning Key Laboratory of Recycling Science for Metallurgical Resources, Shenyang 110819, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Shifeng Dai
Received: 26 March 2017 / Revised: 7 May 2017 / Accepted: 18 May 2017 / Published: 23 May 2017
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Abstract

Coal-based reduction and magnetic separation behavior of low-grade vanadium-titanium magnetite pellets were studied in this paper. It is found that the metallization degree increased obviously with an increase in the temperature from 1100 °C to 1400 °C. The phase composition transformation was specifically analyzed with X-ray diffraction (XRD). The microscopic examination was carried out with scanning electron microscopy (SEM), and the element composition and distribution were detected with energy dispersive spectroscopy (EDS). It is observed that the amounts of metallic iron particles obviously increased and the accumulation and growing tendency were gradually facilitated with the increase in the temperature from 1100 °C to 1400 °C. It is also found that the titanium oxides were gradually reduced and separated from ferrum-titanium oxides during reduction. In addition, with increasing the temperature from 1200 °C to 1350 °C, silicate phases, especially calcium silicate phases that were transformed from calcium ferrite at 1100 °C, were observed and gradually aggregated. However, at 1400 °C some silicate phases infiltrated into metallic iron, as it appears that the carbides, especially TiC, could probably contribute to the sintering phenomenon becoming serious. The transformation behavior of valuable elements was as follows: Fe2VO4 → VO → V → VC; FeTiO3 (→ FeTi2O5) → TiO2 → TiC; FeCr2O4 → Cr → CrC; FeTiO3 (→ FeTi2O5) → Fe0.5Mg0.5Ti2O5; (Fe3O4/FeTiO3→) FeO → Mg0.77Fe0.23O. Through the magnetic separation of coal-based reduced products, it is demonstrated that the separation of Cr, V, Ti, and non-magnetic phases can be preliminarily realized. View Full-Text
Keywords: low-grade vanadium-titanium magnetite; pellets; coal-based reduction; magnetic separation behavior low-grade vanadium-titanium magnetite; pellets; coal-based reduction; magnetic separation behavior
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MDPI and ACS Style

Cheng, G.; Gao, Z.; Lv, M.; Yang, H.; Xue, X. Coal-Based Reduction and Magnetic Separation Behavior of Low-Grade Vanadium-Titanium Magnetite Pellets. Minerals 2017, 7, 86.

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