摘要:
为从含铌铁水中提铌,降低铁水中硅含量以获得高品质的铌渣,实现铌资源的综合利用。采用100 kW中频感应炉进行底吹氧气冶炼含铌铁水试验,研究含铌铁水在脱硅过程中硅、铌选择性氧化规律。结果表明:铁水温度在1 350℃,造渣剂碱度为1.5,反应结束后铁水中硅、铌的氧化分别为75.8%、21.4%;而温度在1 350℃,造渣剂碱度为4.6,反应后铁水中硅和铌的氧化率分别为:94.0%,5.9%,但高碱度炉渣抑制了锰元素的去除,造成铁水中锰含量较高,降低后续工艺中提铌所得铌渣的品位。在铁水温度为1 350℃,炉渣碱度w(CaO)/w(SiO2)为1.5时,脱硅的限度为0.15%。
Abstract:
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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