Formation of calcium titanate in the carbothermic reduction of vanadium titanomagnetite concentrate by adding CaCO3
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第6期
论文作者：Xiao-hui Li Jue Kou Ti-chang Sun Shi-chao Wu Yong-qiang Zhao
文章页码：745 - 753
摘 要：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 Ca CO3 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 18 wt% 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.
Xiao-hui Li，Jue Kou，Ti-chang Sun，Shi-chao Wu，Yong-qiang Zhao
School of Civil and Resource Engineering, University of Science and Technology Beijing
摘 要：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 Ca CO3 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 18 wt% 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.
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