CAJ | 학술논문

含铌铁水通过脱碳保铌探索作为合金化元素回收铁水中铌并直接冶炼为含铌微合金钢的方法。试验在真空碳管炉内进行，铁水温度为1500℃，氧化剂为Fe2O3，真空度为10 Pa，分别进行有SiO2-CaO-Al2O3系造渣剂、无渣真空氧化冶炼研究。结果表明：在无渣条件下，加入Fe2O3铁水中硅、铌和碳同时氧化，不能脱碳保铌；加入造渣剂时，造渣剂的碱度越低，铁水中的硅氧化量越低，碳氧化量越高，碳质量分数最低下降到0.032%，铌质量分数最低值从0.09%下降到0.082%；碱度越高，铁水中硅氧化量越高，铌的氧化量也越高；真空氧化冶炼能够促进碳氧化，减少硅的氧化，抑止铌氧化。在50 kg级真空感应电炉内成功进行了回收铁水中铌直接冶炼为含铌钢试验，为回收含铌铁水中的铌提供新方法，也为工业化直接冶炼含铌钢提供试验依据。
함니철수통과탈탄보니탐색작위합금화원소회수철수중니병직접야련위함니미합금강적방법。시험재진공탄관로내진행，철수온도위1500℃，양화제위Fe2O3，진공도위10 Pa，분별진행유SiO2-CaO-Al2O3계조사제、무사진공양화야련연구。결과표명：재무사조건하，가입Fe2O3철수중규、니화탄동시양화，불능탈탄보니；가입조사제시，조사제적감도월저，철수중적규양화량월저，탄양화량월고，탄질량분수최저하강도0.032%，니질량분수최저치종0.09%하강도0.082%；감도월고，철수중규양화량월고，니적양화량야월고；진공양화야련능구촉진탄양화，감소규적양화，억지니양화。재50 kg급진공감응전로내성공진행료회수철수중니직접야련위함니강시험，위회수함니철수중적니제공신방법，야위공업화직접야련함니강제공시험의거。
As a micro-alloyed element,Nb was recovered to made Nb-bearing microalloyed steel from Nb-bearing hot metal in a vacuum carbon tube furnace by decarburization and conversation of niobium with Fe2O3 oxidant at 1 500℃. The results show that when slag isn't placed on the hot metal,silicon,niobium and carbon are oxidized simultaneously, which cannot make Nb-bearing steel. When basicity of SiO2-CaO-Al2O3 flux decreases,oxidation of silicon decreases, and decarburization is easy to complete in the molten iron and the oxidization of niobium is suppressed in the metal bath. By the way,carbon content of the molten iron is decreased to 0.032%and niobium content is decreased from 0.09%to 0.082%. When the basicity of SiO2-CaO-Al2O3 flux decreases,the lower silicon and niobium oxidize,the higher carbon oxidizes. On the other hand,when the vacuum of the furnace is lowed to 10 Pa,oxidization of silicon and niobium of Nb-bearing hot metal is suppressed and oxidization of carbon increases. By the test of the vacuum condition and acid SiO2-CaO-Al2O3 slag formed at 1 500℃,50 kg scale experiments have been completed and it is important not only to provide laboratory findings of commercial test for recovery of niobium from Nb-bearing hot metal to make Nb-bearing microal-loyed steel but also to provide a new method to recover Nb from Nb-bearing hot metal.