选矿法回收钽铌锂云母多金属矿中的钽铌锂

Recovery of lithium,tantalum and niobium from tantalum-niobium lithium-mica polymetallic ore by beneficiation method

锂云母矿石组成复杂,同时伴生的钽、铌易碎过磨,使得该类资源综合回收难度较大。在开展某含钽铌锂云母多金属矿工艺矿物学研究的基础上,采用重选-浮选联合工艺对矿石中有价组分进行综合回收试验。结果表明:在原矿Li_(2)O品位0.65%,(Ta、Nb)_(2)O_(5)品位0.016%的条件下,通过螺旋溜槽粗选-摇床粗选-摇床精选的重选工艺,然后对重选尾矿进行浮选,以碳酸钠作为pH调整剂、六偏磷酸钠作为抑制剂、BK426作为锂云母捕收剂,浮选精矿中锂云母大部分单体解离,微细粒云母部分浸染在长石、石英、含黏土的氧化铁粉砂中,较难在磨矿过程中单体解离,最终可获得(Ta、Nb)_(2)O_(5)品位30.44%,回收率为36.15%的钽铌精矿产品,Li_(2)O品位4.63%、回收率为93.29%的锂云母精矿产品,较好地实现了该多金属矿有价组分的综合回收。

The composition of lepidolite ore is complex,and the associated tantalum and niobium are easily crushed and overground,which makes the comprehensive recovery of these resources difficult.Based on the technological mineralogy study of a tantalum-niobium-lepidolite polymetallic ore,the comprehensive recovery test of valuable components in the ore was carried out by the combined process of gravity separation and flotation.The results show that:under the condition of raw ore with Li_(2)O grade 0.65%and(Ta,Nb)_(2)O_(5)grade 0.016%,the gravity separation process of spiral chute roughing,shaker roughing and shaker selection is carried out,and then the gravity separation tailings are processed by flotation,with sodium carbonate as pH regulator,sodium hexametaphosphate as inhibitor,and BK426 as lepidolite collector.In the flotation concentrate,most of the monomers of lepidolite are dissociated,and some of the mica is soaked in feldspar,quartz and clay-containing iron oxide silt,which is difficult to dissociate in the grinding process.Finally,tantalum niobium concentrate with a grade of(Ta,Nb)_(2)O_(5)is obtained with a recovery rate of 36.15%.With Li_(2)O grade of 4.63%and recovery rate of 93.29%,the comprehensive recovery of valuable components of the polymetallic ore has been achieved.