Thermodynamic studies on gas-based reduction of vanadium titano-magnetite pellets

Jun-wei Chen; Yang Jiao; Xi-dong Wang

doi:10.1007/s12613-019-1795-8

Volume 26 Issue 7

Jul. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(7): 822-830

Jun-wei Chen, Yang Jiao, and Xi-dong Wang, Thermodynamic studies on gas-based reduction of vanadium titano-magnetite pellets, Int. J. Miner. Metall. Mater., 26(2019), No. 7, pp. 822-830. https://doi.org/10.1007/s12613-019-1795-8

Cite this article as:

Jun-wei Chen, Yang Jiao, and Xi-dong Wang, Thermodynamic studies on gas-based reduction of vanadium titano-magnetite pellets, Int. J. Miner. Metall. Mater., 26(2019), No. 7, pp. 822-830. https://doi.org/10.1007/s12613-019-1795-8

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Research Article

Thermodynamic studies on gas-based reduction of vanadium titano-magnetite pellets

+ Author Affiliations

Corresponding author:
Xi-dong Wang E-mail: xidong@pku.edu.cn
Received: 12 September 2018; Revised: 16 November 2018; Accepted: 22 November 2018

Abstract

Abstract

Numerous studies have focused on the reduction thermodynamics of ordinary iron ore; by contrast, the literature contains few thermodynamic studies on the gas-based reduction of vanadium titano-magnetite (VTM) in mixed atmospheres of H₂, CO, H₂O, CO₂, and N₂. In this paper, thermodynamic studies on the reduction of oxidized VTM pellets were systematically conducted in an atmosphere of a C-H-O system as a reducing agent. The results indicate that VTM of an equivalent valence state is more difficult to reduce than ordinary iron ore. A reduction equilibrium diagram using the C-H-O system as a reducing agent was obtained; it clearly describes the reduction process. Experiments were performed to investigate the effects of the reduction temperature, the gas composition, and two types of iron ores on the reduction of oxidized VTM pellets. The results show that the final reduction degree increases with increasing reduction temperature, increasing molar ratio of H₂/(H₂ + CO), and decreasing H₂O, CO₂, and N₂ contents. In addition, the reduction processes under various conditions are discussed. All of the results of the reduction experiments are consistent with those of theoretical thermodynamic analysis. This study is expected to provide valuable thermodynamic theory on the industrial applications of VTM.
- vanadium titano-magnetite;
- gas-based reduction;
- C-H-O system;
- thermodynamics

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