新疆某伟晶岩型锂多金属矿石中伴生元素的回收试验

新疆某伟晶岩型锂多金属矿伴生钽铌锡等有价元素，其中钽铌主要以钽铌铁矿的形式存在，锡主要以锡石的形式存在。为提高伴生元素的回收率，根据矿石性质最终确定了粗磨—重选预富集—强磁选—离 心分离的原则工艺流程，并开展了相关条件试验研究。重液分析确定重选适宜的入选粒度为-0.35 mm，在此条件下，通过螺旋溜槽粗选—摇床精选工艺实现了钽铌锡预富集。对预富集精矿进行锡石与钽铌铁矿的强磁 选分离，适宜的工作参数为磁场强度800 mT、脉动频率260次/min。非磁性产品主要为锡石和锂辉石，在冲洗水量2.0 L/min、给矿浓度30%、给矿量1.0 kg/min的条件下，确定离心选别适宜的重力加速度为50G。根据 条件试验确定的工艺条件，进行螺旋溜槽粗选—摇床精选—弱磁选—强磁选—离心重选全流程试验，最终获得了Ta2O5品位13.90%、Nb2O5品位29.14%、Ta2O5回收率49.50%、Nb2O5回收率58.37%的钽铌精矿及Sn品位 41.45%、Sn回收率54.39%的锡精矿，有效实现了伴生有价矿物的综合回收。

Experimental Study on Comprehensive Recovery of Associated Elements in Pegmatite Lithium Polymetallic Ore in Xinjiang

Tantalum， niobium and tin are associated with a pegemite type lithium polymetallic ore in Xinjiang， among which tantalum and niobium mainly exist in the form of tantalum and niobite， and tin mainly exist in the form of cassiterite. In order to improve the recovery rate of the associated elements， the principle process flow of coarse grinding， gravity separation preconcentration， high-intensity magnetic separation， and centrifugal separation was determined according to the properties of the ore， and the related condition test were conducted. The suitable particle size for gravity separation was determined as -0.35 mm by heavy liquid analysis. The pre-concentration of tantalum， niobium and tin was realized by screw chute roughing and shaking cleaning under this condition. High intensity magnetic separation of cassiterite and tantalum-niobite from pre-concentrated concentrate was carried out. The suitable working parameters were magnetic field intensity of 800 mT and pulsation frequency of 260 times/min. The non-magnetic products are mainly cassiterite and spodumene. Under the conditions of washing water of 2.0 L/min， ore feeding concentration of 30% and ore feeding amount of 1.0 kg/min， the suitable gravity acceleration of centrifugal separation is determined to be 50G in the centrifugal separating test. According to the technological conditions determined by the condition test， the whole process test of spiral chute roughing， shaking table cleaning， low intensity magnetic separation， high intensity magnetic separation and centrifugal gravity separation was carried out. Finally， tantalum and niobium concentrate with Ta2O5 grade of 13.90%， Nb2O5 grade of 29.14%， Ta2O5 recovery rate of 49.50%， Nb2O5 recovery rate of 58.37% and Sn concentrate with Sn grade of 41.45% and Sn recovery rate of 54.39% were obtained， which effectively realized the comprehensive recovery of associated valuable minerals.