含铌尾矿的直接还原研究

Research for Direct Reduction of Niobite Tailing

为开发一种新的铌铁冶炼工艺,实现综合利用国内包头白云鄂博特殊矿的铁-铌-稀土资源,进行了含铌尾矿冶炼新工艺的基础性研究。由热力学分析可知,标准状态下,C直接还原NbO的温度(1 489℃)比还原FeO的温度(705℃)高得多,所以可以通过罐式法直接还原含铌尾矿,先还原铁,分离铁与铌氧化物,使铌富集在渣中,达到铌铁分离的目的,然后再还原铌氧化物。并在此基础上,将含铌尾矿的还原效果与铁精矿的进行对比与分析,确定最佳的还原工艺和操作参数。综合各种因素,通过对3种不同装料方式罐式法还原试验的比较分析,认为最适合的还原工艺参数为:950℃饼状罐式法还原,还原时间4 h。

To develop a new technology for smelting niobite and put into effect comprehensive utilization the Fe-Nb-RE special resource from Baiyunebo of Baotou. The article has done the fundamental theory research for the new technology of smelting niobite. By thermodynamic analysis, the temperature （1489 ℃） of carbon directly reduce NbO than the temperature （705℃） of carbon directly reduce FeO is much higher at standard state, So directly reduce niobite tailing by tank reduction methods, first iron reduced, and separate iron with niobium oxides to enrich niobium into slag, finally reduce niobium oxides. The based on front, The optimal reduction technology and operation parameters are obtained by comparing the results of reducing iron preparation concentrate and niobite tailing with different tank reduction methods. In summary, by analysis and comparation on three different charging methods that the optimal technology parameters for niobite tailing direct reduction are： the charging method is pancake and reducing time is 4 hours at 950 ℃.