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采用兰炭为还原剂,利用罐式选择性还原的方法处理铌铁精矿,研究不同还原条件时金属化率的变化规律,利用扫描电镜观察铌的赋存形式,利用电炉熔分脱铁的方法处理还原后的铌铁精矿,考察铌氧化物的富集程度。研究结果表明,当温度为940~970℃时,还原2.5 h时铌铁精矿中铁氧化物金属化率可达85%以上,在还原过程中,铌氧化物不被还原成金属铌;铌主要以含钛、铁硅酸盐形式存在于还原后团块中;熔分获得金属铁和富铌渣,富铌渣中铌氧化物是原矿的1.55倍。
Using blue carbon as reductant, the use of canister selective reduction method to deal with the niobium iron concentrate, the study of different reduction conditions metallization rate changes, the use of scanning electron microscopy Niobium forms of occurrence, the use of EAF Methods The reduced iron ore concentrate was treated to investigate the enrichment of niobium oxide. The results show that when the temperature is between 940 ℃ and 970 ℃, the metallization rate of iron oxide in the ferroniobium concentrate reaches more than 85% when the temperature is 940 ℃ to 970 ℃, and the niobium oxide is not reduced to metallic niobium during the reduction process. In the form of titanium, iron silicate exists in the reduced agglomerates; metal iron and rich niobium slag obtained, niobium rich niobium oxide is 1.55 times the original ore.