【摘要】 包头铁矿含有大量的铌,目前包钢提铌流程是钢铁冶金主流程的分支流程,其中高炉是火法还原富集铌的主要部分。实验研究发现,在高炉碳热还原过程中铌会被还原成碳化铌(NbC),并在渣铁界面形成NbC滞留带。由于滞留带的存在,阻碍了铌进入铁相,影响了铌的还原回收率。NbC在碳饱和铁液中有一定的溶解度,温度升高使溶解度增加,有利于提高铌的还原回收率。更多还原

【Abstract】 The Nb extraction process in Baotou Steel Company is a process accompanied with the iron and steel-making process, in which the blast furnace smelting is one of the main step of extracting Nb. It was discovered by experiment that niobium oxide could be turned into niobium carbide(NbC) during carbonthermal reduction and the detained NbC layer exised at the metal-slag interface. The existence of tne detained NbC layer obstructs the entering of Nb into iron and has bad effects on the Nb recovery ratio. NbC can dissol- ve into liquid iron. Raising temperature is favourable for the increasing of the solubility of NbC in iron and the raising of Nb recovery ratio.更多还原