重色浮联合选矿工艺回收某花岗岩型锂辉石中的锂  

Recovery of Lithium from a Granite Type Spodumene by Gravity-color-flotation Combination Process

作　　者：刘广学[1,2] 彭团儿 刘磊[1,2] 李树磊 LIU Guangxue;PENG Tuaner;LIU Lei;LI Shulei(Zhengzhou Institute of Multipurpose Utilization of Mineral Resources,CAGS,Zhengzhou 450006,China;Key Laborato-ry for Polymetallic Ores'Evaluation and Utilization,MNR,Zhengzhou 450006,China;National Engineering Research Center of Coal Preparation and Purification,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国地质科学院郑州矿产综合利用研究所,河南郑州450006 [2]自然资源部多金属矿综合利用评价重点实验室,河南郑州450006 [3]中国矿业大学国家煤加工与洁净化工程技术研究中心,江苏徐州221116

出　　处：《金属矿山》2021年第3期124-129,共6页Metal Mine

基　　金：中国地质调查局地质调查项目(编号:DD20190186)。

摘　　要：我国锂资源消耗量逐年攀升,而国内矿石型锂资源品位较低,卤水型锂资源开发难度较大,锂精矿产品难以满足国内生产需要。国外某锂辉石跳汰分选中矿作为进口锂精矿的附加产品购进,为探究其选矿工艺,以矿石性质研究结果为基础,采用重色浮联合选矿工艺进行了选矿试验研究。结果表明:(1)试样中Li_(2)O含量为3.60%,主要有价矿物为锂辉石,主要脉石矿物为长石、石英和云母。锂辉石粒度大部分在1 mm以上,主要脉石和连生体粒度为2 mm以上;(2)+0.5 mm粗粒原料在重液密度为2.85 g/cm^(3)时,可以获得Li_(2)O含量大于5.5%的锂辉石精矿,精矿作业回收率较高,经计算机模拟所得两段连续重介质旋流器分选预测结果与之契合度高,工业推广可行性高;(3)+0.5 mm粗粒原料采用筛分分级—重悬浮液分选流程,在介质密度为2.70 g/cm3的条件下,可以抛掉产率为21.76%,Li_(2)O品位为0.18%的重液尾矿,Li_(2)O在重液尾矿中的金属量损失仅为1.09%;(4)重液精矿经色选机分选,精矿Li_(2)O品位由5.73%提高至6.18%,精矿质量提高一个等级,Li_(2)O作业回收率高达89.23%;(5)色选尾矿、重液中矿和-0.5 mm矿石作为混合中矿,其Li_(2)O品位高达2%~3.57%,以自主研发的EL为锂辉石浮选捕收剂,经"1粗2精2扫",最终获得Li_(2)O品位6.53%、Li_(2)O作业回收率91.51%的浮选精矿。全流程试验分选指标优异,有效降低了磨矿成本,具有一定工程推广应用价值。The consumption of lithium resources in China is increasing by years. The grade of domestic ore-type lithium resources is low,and the development of brine type lithium resources is difficult. The lithium concentrate products can not meet the domestic production needs. A foreign spodumene jigging middling ore was purchased as an additional product of imported lithium concentrate. In order to explore its beneficiation process,the beneficiation test was carried out based on the research results of ore properties using gravity-color-flotation combination process. The results showed that:(1) The content of Li_(2)O in the sample is 3.60%. The main valuable minerals are spodumene,and the main gangue minerals are feldspar,quartz and mica. The granularity of spodumene is more than 1 mm,and the granularity of gangue and aggregate is more than 2 mm.(2) When the density of heavy liquid is 2.85 g/cm3,spodumene concentrate with Li_(2)O content greater than5.5% can be obtained with a higher recovery rate. The predicted results of two-stage continuous heavy medium cyclone separation obtained by computer simulation are in good agreement with the experiment results,and the industrial promotion feasibility is high.(3) The coarse raw material beyond 0.5 mm adopts the process of screening classification and heavy suspension separation. Under the condition of medium density of 2.70 g/cm3,the heavy liquid tailings with yield of 21.76% and Li_(2)O grade of 0.18% can be discarded. The metal loss of Li_(2)O in the heavy liquid tailings is only 1.09%.(4) After the separation of heavy liquid concentrate by color separator,the grade of Li_(2)O was increased from 5.73% to 6.18%,the concentrate quality was improved by one grade,and the recovery rate of Li_(2)O was as high as 89.23%.(5) Color-separation tailings,heavy liquid middlings and ores below 0.5 mm were regarded as mixed middlings with the Li_(2)O grade up to 2%~3.57%,a flotation concentrate with Li_(2)O grade of 6.53% and Li_(2)O operation recovery of 91.51% was finally obtained throug

关 键 词：锂辉石 重介质分选 色选 浮选 

分 类 号：TD955[矿业工程—选矿]