Effects of calcium compounds on the carbothermic reduction of vanadium titanomagnetite concentrate
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第3期
论文作者：Xiao-hui Li Jue Kou Ti-chang Sun Shi-chao Wu Yong-qiang Zhao
文章页码：301 - 309
摘 要：Effects of calcium compounds on the carbothermic reduction of vanadium titanomagnetite concentrate（VTC） were investigated. It was found that calcium compounds had great effects on the metallization rate of the reduction product, the order of the metallization rate of reduction product being CaCO3 > no additive > CaSO4 > CaCl2, which indicated that the addition of CaCO3 was more conducive to promoting the reduction of iron than other calcium compounds. Gas analysis showed that there were mainly two processes in the carbothermic reduction of VTC, a solid–solid and a solid–gas reaction. The concentrations of CO and CO2 were highest when CaCO3 was added, while that in a roasting system decreased the most when CaCl2 was added. X-ray diffraction（XRD） analysis showed that calcium compounds could change the reduction process of ilmenite in VTC. The phase compositions of the reduction products were changed from metallic iron（Fe） and anosovite（FeTi2O5） to metallic iron（Fe） and perovekite（CaTiO3） when calcium compounds were added. Additionally, CaSO4 and CaCl2 could significantly promote the growth of metallic iron particles, though the existence of Fe-bearing Mg2TiO4 in reduction products was not conducive to the reduction of iron. The formation of FeS would further hinder the reduction of iron after adding CaSO4.
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：Effects of calcium compounds on the carbothermic reduction of vanadium titanomagnetite concentrate（VTC） were investigated. It was found that calcium compounds had great effects on the metallization rate of the reduction product, the order of the metallization rate of reduction product being CaCO3 > no additive > CaSO4 > CaCl2, which indicated that the addition of CaCO3 was more conducive to promoting the reduction of iron than other calcium compounds. Gas analysis showed that there were mainly two processes in the carbothermic reduction of VTC, a solid–solid and a solid–gas reaction. The concentrations of CO and CO2 were highest when CaCO3 was added, while that in a roasting system decreased the most when CaCl2 was added. X-ray diffraction（XRD） analysis showed that calcium compounds could change the reduction process of ilmenite in VTC. The phase compositions of the reduction products were changed from metallic iron（Fe） and anosovite（FeTi2O5） to metallic iron（Fe） and perovekite（CaTiO3） when calcium compounds were added. Additionally, CaSO4 and CaCl2 could significantly promote the growth of metallic iron particles, though the existence of Fe-bearing Mg2TiO4 in reduction products was not conducive to the reduction of iron. The formation of FeS would further hinder the reduction of iron after adding CaSO4.
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