含铌铁矿粉选择性还原富集铌的正交实验研究

Enrichment of Niobium by Selective Reduction of Niobium-Bearing Iron Ore:An Orthogonal Experimental Study

研究了以含铌铁矿粉为原料选择性还原富集铌的正交实验研究。以氢气为还原剂,在氩气保护气氛下进行气基选择性还原,为了使把含铌铁矿粉中硫、磷、铁等杂质去掉,得到富集铌。通过正交实验的设计,分别研究了还原温度、还原时间、通氢量对还原后矿粉的失重率的影响。通过实验数据综合分析得到最佳实验条件及参数为:还原温度为950℃,还原时间为3 h,通氢量为90 L/h的条件下得到还原后的含铌铁矿粉的失重率较高。

A novel technique has been successfully developed to enrich Nb by selective reduction of Nb-containing iron-ore powder,with H2 as the reduction agent in argon atmosphere.The influence of the hydrogen flow rate,reduction temperature and reduction time on the removal of the impurities,including,but not limited to the Fe,S,P,Al and Si oxides(or weight loss rate) from the Nb-bearing iron ore,was experimentally investigated via orthogonal design. The preliminary results show that the newly-developed hydrogen selective reduction is feasible for the enrichment of Nb under the optimized conditions,including a reduction temperature of 950℃,a reduction time for 3 h and a hydrogen flow rate of 90 L/h.We suggest that the new technique be of some technological interest in extraction of metal Nb from the Nb-containing multi-metallic minerals.