白云鄂博氧化矿石深度还原-磁选试验研究

Testing Investigation on the Reduction/Magnetic Separation of Oxide Ore from Bayan Obo

采用深度还原技术将白云鄂博氧化矿石转化为高金属化率的还原物料,然后再经选矿实现了铁、稀土、铌等元素的有效分离及富集.通过对还原温度、还原时间、配碳比等条件的优化,得到了铁金属化率94.48%的还原矿,经阶段磨矿—粗细分选流程的选别,可获得全铁品位为91.61%,金属化率为93.79%,铁回收率为93.23%的铁粉,该铁粉可作为炼钢的原料;尾矿中稀土品位12.25%,回收率98.73%,可作为分选稀土的原料.

The reduced oxide ore from Bayan Obo with high metallization rate was obtained via a high-efficiency reduction process,then the efficient concentrations of such metal elements as Fe,Nb and RE were implemented.The reduced ore with metallization rate up to 94.48% was obtained by optimizing the operation parameters in tests such as reducing temperature/time and carbon ratio,and,after stepped grinding and grain-size separation,the Fe grade 91.61%,metallization rate 93.79% and Fe recovery rate 93.23% were obtained as the starting material for steel-making.In the tailings the REO is 12.25% with recovery rate 98.73%,i.e.available to be the raw material for RE beneficiation.