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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%。
In order to improve the comprehensive utilization of niobium resources, niobium is extracted from the niobium-containing molten iron and the silicon content in the molten iron is reduced to obtain high-quality niobium slag. The bottom blowing oxygen smelting niobium-containing molten iron test was carried out with a 100 kW medium frequency induction furnace to study the selective oxidation of silicon and niobium during desilication of niobium-bearing molten iron. The results show that the temperature of molten iron is 1 350 ℃ and the alkalinity of slag making agent is 1.5. After the reaction, the oxidation rates of silicon and niobium in molten iron are 75.8% and 21.4% respectively; while the temperature is 1 350 ℃, the alkalinity of slag forming agent is 4.6 , The oxidation rates of silicon and niobium in the molten iron after the reaction are 94.0% and 5.9%, respectively. However, the high basicity slag inhibits the removal of manganese, resulting in a higher manganese content in the molten iron and lower niobium residue in the subsequent process grade. When the molten iron temperature is 1 350 ℃ and the basicity of the slag w (CaO) / w (SiO2) is 1.5, the limit of desilication is 0.15%.