四川李家沟锂辉石矿Ⅰ号矿脉矿石工艺矿物学研究

Study on Process Mineralogy of Spodumene Ore No.I Vein Ore in Lijiagou,Sichuan Province

为了高效开发利用四川李家沟锂辉石矿,通过偏光显微镜观察、化学多元素分析、X射线衍射分析(XRD)等手段,对李家沟锂辉石矿床Ⅰ号脉矿石进行了工艺矿物学特性研究。研究结果表明:矿石中Li_(2)O含量0.82%,属于低品位矿石;矿石中的矿物主要为锂辉石,整体呈中粗粒嵌布,晶体粒度较为粗大;脉石矿物为石英、长石和云母,云母和长石中含有极其微量的锂。锂辉石虽然嵌布粒度粗细不均,但320~1280μm中粒产率达78.174%,属易解离的矿石类型。矿石中的锂主要赋存于锂辉石中,配分比97.998%,其中Rb_(2)O平均品位0.082%,达到了综合回收伴生铷的工业品位指标;锂辉石单矿物化学分析结果显示,Li_(2)O含量7.68%,低于锂辉石理论含量,其中可能发生类质同象替代,矿石中还含有Fe、Mn、Na等杂质,以及部分铁锰质填充在锂辉石的解理和裂隙中,这将对锂辉石的品级产生一定程度的影响。

In order to efficiently develop and utilize the Lijiagou spodumene deposit in Sichuan Prov-ince,the process mineralogical characteristics of No.1 vein ore in Lijiagou spodumene deposit are studied by means of polarizing microscope observation,chemical multi-element analysis and X-ray diffraction anal-ysis(XRD).The results show that the content of Li_(2)O in the ore is 0.82%,which belongs to low grade ore.The minerals in the ore are mainly spodumene,with medium-coarse grained dissemination and coarse crys-tal size.Gangue minerals are quartz,feldspar and mica,and mica and feldspar contain extremely trace amounts of lithium.Although the particle size of spodumene is uneven,the yield of medium particles in 320~1280μm is 78.174%,which is a type of ore that is easy to be dissociated.The lithium in the ore main-ly occurs in spodumene with a distribution ratio of 97.998%,and the average grade of Rb_(2)O is 0.082%,which reaches the industrial grade index of comprehensive recovery of associated rubidium.The results of single mineral chemical analysis of spodumene show that the content of Li_(2)O is 7.68%,which is lower than the theoretical content of spodumene.Isomorphous substitution may occur.The ore also contains impurities such as Fe,Mn and Na,and some iron and manganese are filled in the cleavage and fissure of spodumene,which will have a certain degree of influence on the grade of spodumene.