白云鄂博矿稀土浮选尾矿回收铌试验

Recovery of Niobium from Rare Earth Flotation Tailings of Bayan Obo Mine

为了提高白云鄂博主东矿资源的综合利用率,针对原设计工艺稀土浮选尾矿回收流程长、药剂种类多、药剂制度复杂、选铁工序稳定性差的问题,对氧化矿资源综合利用生产线稀土浮选尾矿进行了回收铌试验。根据不同矿物比磁化系数的差异,采用多段磁选作业,浮磁联合选别,逐段实现除杂、抛尾,剔除影响铌矿物选别的杂质矿物,达到有效富集铌矿物的目的;通过将稀土浮选尾矿磨至-0.045 mm90%,采用混合浮选—混合尾矿预选—高梯度磁选—强磁精选工艺流程,可获得铌品位1.69%、铌回收率28.57%的铌粗精矿,为选别高品位铌精矿奠定了良好的基础。

In order to improve the comprehensive utilization rate of Bayan Obo Main East Mine resources,aiming at the problems of long recovery process of rare earth flotation tailings,too many kinds of reagents,complex reagent system and poor stability of iron separation process in the original design process,the recovery of niobium from rare earth flotation tailings in the comprehensive utilization production line of oxidized ore resources was carried out.According to the difference of specific magnetization coefficient of different minerals,multi-stage magnetic separation operation and flotation-magnetic separation combined process are adopted to remove impurities and discard tailings step by step,and the impurity minerals affecting the separation of niobium minerals are removed to achieve the purpose of effectively enriching niobium minerals.By grinding the rare earth flotation tailings to-0.045 mm 90%,the niobium rough concentrate with niobium grade of 1.69%and niobium recovery of 28.57%can be obtained by using the process flow of mixed flotation-mixed tailings preconcentration-high gradient magnetic separation-high intensity magnetic cleaning separation,which lays a good foundation for the separation of high grade niobium concentrate.