四川壤塘锂多金属矿石选矿试验研究

Experimental Study on Comprehensive Recovery of Rangtang Lithium-contained Complex Ore of Sichuan

四川壤塘锂多金属矿石中主要有用矿物为锂辉石,具有综合回收价值的矿物为钽铁矿、铌铁矿和锡石。根据钽铌铁矿及锡石与锂辉石和脉石矿物的密度差异、钽铌铁矿与锡石的磁性差异以及锂辉石与脉石矿物的可浮性差异,采用分级重选—磁选—浮选联合工艺流程进行选矿试验,获得了锂精矿、钽铌精矿和锡精矿,使矿石中的有价元素得到了较好的综合回收。锂精矿Li2O品位为5.53%,Li2O回收率为72.68%;钽铌精矿Ta2O5和Nb2O5品位为17.00%和32.55%,Ta2O5和Nb2O5回收率为59.38%和66.05%;锡精矿锡品位为52.16%,锡回收率为80.00%。

The main valuable mineral is spodumene in Rangtang Lithium polymetallic ores of Sichuan.The recoverable minerals are tantalite,niobium and minerals.According to density differences of tantalum-niobium and cassiterite,and spodumene and gangue minerals,the magnetic properties differences of tantalum-niobite and cassiterite,and the floatability difference of spodumene and gangue minerals,the beneficiation process test consisting of the gravity separation-magnetic separation-flotation is adopted to get the tantalum,niobium and tin ore concentrates,so that all valuable elements in ores have been better recovered.The lithium concentrate with grade of 5.53% and recovery 72.68% is obtained;Meanwhile,the tantalum and niobium concentrates of Ta_2O_5 and Nb_2O_5 are grading at 17.00% and 32.55% with a 59.38% and 66.05% recovery respectively,and the tin concentrate is grading at 52.16% with a 99.14% recovery.