Li Nan, Zhao Zengwu, Lu Husheng, Xu Zhangyin, Li Baowei. Study on Desilication of Nb-bearing Hot Metal[J]. IRON STEEL VANADIUM TITANIUM, 2014, 35(1): 107-111. doi: 10.7513/j.issn.1004-7638.2014.01.021
Citation:
Li Nan, Zhao Zengwu, Lu Husheng, Xu Zhangyin, Li Baowei. Study on Desilication of Nb-bearing Hot Metal[J]. IRON STEEL VANADIUM TITANIUM, 2014, 35(1): 107-111. doi: 10.7513/j.issn.1004-7638.2014.01.021
Li Nan, Zhao Zengwu, Lu Husheng, Xu Zhangyin, Li Baowei. Study on Desilication of Nb-bearing Hot Metal[J]. IRON STEEL VANADIUM TITANIUM, 2014, 35(1): 107-111. doi: 10.7513/j.issn.1004-7638.2014.01.021
Citation:
Li Nan, Zhao Zengwu, Lu Husheng, Xu Zhangyin, Li Baowei. Study on Desilication of Nb-bearing Hot Metal[J]. IRON STEEL VANADIUM TITANIUM, 2014, 35(1): 107-111. doi: 10.7513/j.issn.1004-7638.2014.01.021
Inner Mongolia Key Laboratory for Utilization of Bayan Obo Multi-metallic Resources, Elected State Key Laboratory, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China
In order to extract niobium from Nb-bearing hot metal and obtain high-quality niobium slag,it is desired to reduce the silicon content in molten iron.Baotou Nb-bearing hot metal was smelted in 100 kW medium-frequency induction furnace by oxygen bottom blowing to study the selective oxidation of silicon and niobium during desilication.After reaction,the oxidization rates of silicon and niobium are 75.8% and 21.4% respectively with the molten iron temperature of 1 350℃ and slag basicity of 1.5, and the oxidization rates of silicon and niobium are 94.0% and 5.9% respectively with the molten iron temperature of 1 350℃ and slag basicity of 4.6.The study results show that high basicity slag restrains the removal of Mn,resulting in lower grade of niobium slag obtained by extracting Nb in the subsequent process.With the reaction temperature of 1 350℃ and slag basicity w(CaO)/w(SiO2) of 1.5,the desilication limit of 0.15% is appropriate.
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