Formation of calcium titanate in the carbothermic reduction of vanadium titanomagnetite concentrate by adding CaCO<sub>3</sub>

Xiao-hui Li; Jue Kou; Ti-chang Sun; Shi-chao Wu; Yong-qiang Zhao

doi:10.1007/s12613-019-1903-9

Volume 27 Issue 6

Jun. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(6): 745-753

Xiao-hui Li, Jue Kou, Ti-chang Sun, Shi-chao Wu, and Yong-qiang Zhao, Formation of calcium titanate in the carbothermic reduction of vanadium titanomagnetite concentrate by adding CaCO₃, Int. J. Miner. Metall. Mater., 27(2020), No. 6, pp. 745-753. https://doi.org/10.1007/s12613-019-1903-9

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Xiao-hui Li, Jue Kou, Ti-chang Sun, Shi-chao Wu, and Yong-qiang Zhao, Formation of calcium titanate in the carbothermic reduction of vanadium titanomagnetite concentrate by adding CaCO3, Int. J. Miner. Metall. Mater., 27(2020), No. 6, pp. 745-753. https://doi.org/10.1007/s12613-019-1903-9

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Research Article

Formation of calcium titanate in the carbothermic reduction of vanadium titanomagnetite concentrate by adding CaCO₃

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Corresponding author:
Jue Kou E-mail: koujue@ustb.edu.cn
Received: 8 July 2019; Revised: 6 September 2019; Accepted: 9 September 2019; Available online: 2 March 2020

Abstract

Abstract

The formation of calcium titanate in the carbothermic reduction of vanadium titanomagnetite concentrate (VTC) by adding CaCO₃ was investigated. Thermodynamic analysis was employed to show the feasibility of calcium titanate formation by the reaction of ilmenite and CaCO₃ in a reductive atmosphere, where ilmenite is more easily reduced by CO or carbon in the presence of CaCO₃. The effects of CaCO₃ dosage and reduction temperature on the phase transformation and metallization degree were also investigated in an actual roasting test. Appropriate increase of CaCO₃ dosages and reduction temperatures were found to be conducive to the formation of calcium titanate, and the optimum conditions were a CaCO₃ dosage of 18wt% and a reduction temperature of 1400°C. Additionally, scanning electron microscopy–energy dispersive spectrometry (SEM–EDS) analysis shows that calcium titanate produced via the carbothermic reduction of VTC by CaCO₃ addition was of higher purity with particle size approximately 50 μm. Hence, the separation of calcium titanate and metallic iron will be the focus in the future study.
- vanadium titanomagnetite concentrate;
- calcium carbonate;
- carbothermic reduction;
- metallic iron;
- calcium titanate

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