NDLI: Gas-based reduction of vanadium titano-magnetite concentrate: behavior and mechanisms

Content Provider	Springer Nature Link
Author	Sui, Yu lei Guo, Yu feng Jiang, Tao Xie, Xiao lin Wang, Shuai Zheng, Fu qiang
Copyright Year	2017
Abstract	The reduction of vanadium titano-magnetite pellets by H$_{2}$–CO at temperatures from 850 to 1050°C was investigated in this paper. The influences of pre-oxidation treatment, reduction temperature, and $${{{V_{{H_2}}}} \mathord{\left/ {\vphantom {{{V_{{H_2}}}} {\left( {{V_{{H_2}}} + {V_{CO}}} \right)}}} \right. -} {\left( {{V_{{H_2}}} + {V_{CO}}} \right)}}$$ on the metallization degree were studied. The results showed that pre-oxidation played a substantial role in the reduction of vanadium titano-magnetite pellets. During the reduction process, the metallization degree increased with increasing temperature and increasing $${{{V_{{H_2}}}} \mathord{\left/ {\vphantom {{{V_{{H_2}}}} {\left( {{V_{{H_2}}} + {V_{CO}}} \right)}}} \right. -} {\left( {{V_{{H_2}}} + {V_{CO}}} \right)}}$$ . The phase transformation of pre-oxidized vanadium titano-magnetite pellets during the reduction process under an H$_{2}$ atmosphere and a CO atmosphere was discussed, and the reduced samples were analyzed by scanning electron microscopy (SEM) in conjunction with back scatter electron (BSE) imaging. The results show that the difference in thermodynamic reducing ability between H$_{2}$ and CO is not the only factor that leads to differences in the reduction results obtained using different atmospheres. Some of Fe$_{3−x }$Ti$_{ x }$O$_{4}$ cannot be reduced under a CO atmosphere because of the densification of particles’ structure and because of the enrichment of Mg in unreacted cores. By contrast, a loose structure of particles was obtained when the pellets were reduced under an H$_{2}$ atmosphere and this structure decreased the resistance to gas diffusion. Moreover, the phenomenon of Mg enrichment in unreacted cores disappeared during H$_{2}$ reduction. Both the lower resistance to gas diffusion and the lack of Mg enrichment facilitated the reduction of vanadium titano-magnetite.
Starting Page	10
Ending Page	17
Page Count	8
File Format	PDF
ISSN	16744799
Journal	International Journal of Minerals, Metallurgy, and Materials
Volume Number	24
Issue Number	1
e-ISSN	1869103X
Language	English
Publisher	University of Science and Technology Beijing
Publisher Date	2017-01-18
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	titano-magnetite ore reduction behavior mechanisms Materials Science Metallic Materials Characterization and Evaluation of Materials Ceramics, Glass, Composites, Natural Materials Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Geochemistry and Petrology Mechanical Engineering

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