Coal-Based Reduction and Magnetic Separation Behavior of Low-Grade Vanadium-Titanium Magnetite Pellets
| Autor: | He Yang, Zixian Gao, Xiangxin Xue, Mengyang Lv, Gongjin Cheng |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
lcsh:QE351-399.2
Materials science Scanning electron microscope low-grade vanadium-titanium magnetite pellets coal-based reduction magnetic separation behavior Energy-dispersive X-ray spectroscopy Analytical chemistry Vanadium chemistry.chemical_element 02 engineering and technology 020501 mining & metallurgy Carbide chemistry.chemical_compound Magnetite lcsh:Mineralogy Metallurgy Geology Geotechnical Engineering and Engineering Geology Silicate 0205 materials engineering chemistry Calcium silicate Titanium |
| Zdroj: | Minerals; Volume 7; Issue 6; Pages: 86 Minerals, Vol 7, Iss 6, p 86 (2017) |
| ISSN: | 2075-163X |
| DOI: | 10.3390/min7060086 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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