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包头铁矿中含有铌(Nb_2O_50.12～0.65％),虽然品位较低,但总贮量较大(70万吨以上的金属铌),铁矿石在富选铁的过程中,铌损失于尾矿达60％。所谓二流程是将含稀土和铌较多的包头中贫矿直接入高炉冶炼,可以获得含稀土氧化物15％以上的高炉渣作为生产低磷稀土硅铁合金的原料,另外可以得到含铌较高(Nb>0.20％)的铁水,比一般选矿→高炉铁水含铌(<0.08％)高一倍以上,不仅有利于从铁水回收铌的后续工序,而且不经选矿因之大大提高铌的总回收率。
Although Baotou iron ore contains niobium (Nb 2 O 50.12-0.65%), its total reserves are relatively large (more than 700,000 tons of niobium metal) and iron ore is lost in the process of iron enrichment Tailings up to 60%. The so-called second process is the leachate containing more rare earth and niobium Baotou directly into the blast furnace smelting, you can get more than 15% of rare earth oxide containing blast furnace slag as raw materials for the production of low-phosphorus rare earth ferrosilicon alloy, the other can be obtained with higher niobium (Nb> 0.20%) hot metal is more than twice as common as niobium (<0.08%) from the conventional mineral processing → blast furnace hot metal, which is not only beneficial to the follow-up process of recovering niobium from hot metal but also greatly increases the total recovery of niobium rate.