川西可尔因矿田李家沟矿床锂辉石工艺矿物学研究

Study on process mineralogy of spodumene in Lijiagou deposit,Ke'eryin ore field,western Sichuan

李家沟伟晶岩型锂辉石矿床是中国四川松潘-甘孜褶皱带中部可尔因矿田中的典型矿床之一。经过最新的勘探评估工作,李家沟矿床已被确定为超大型锂辉石矿床,备受国内外学者关注,且李家沟矿床矿石工艺特征随高程而变化,急需正确评价李家沟矿床矿石的工业价值。本文在详细的镜下以及手标本观察的基础上,通过X射线粉晶衍射(XRD)、电子探针(EPMA)、激光剥蚀等离子体质谱仪(LA-ICP-MS)、化学全元素分析、化学物相分析、矿物参数自动分析系统(MLA)等方法和技术,查清矿石组成,确定有益、有害元素种类与赋存状态,查明矿石工艺性质,为该区稀有金属资源的综合利用提供理论和技术支持。锂矿石平均品位0.94%,约84.7%的Li来自锂辉石,矿石中Rb_(2)O平均品位0.13%,达到了综合回收伴生元素工业品位要求。锂辉石粒度范围较宽,属于极不均匀矿石,需多段磨矿。根据矿石解离度特征,在进入最终浮选工艺前,建议将物料磨至-0.075 mm。

The Lijiagou pegmatite-type lithium spodumene deposit is one of the typical deposits in the Ke'eryin ore field,located in the central part of the Songpan-Ganzi fold belt in Sichuan Province,China.Through recent exploration and assessment,the Lijiagou deposit has been identified as a super-large spodumene deposit,drawing significant attention from domestic and international scholars.The mineral processing characteristics of the Lijiagou deposit vary with elevation,necessitating an accurate evaluation of the industrial value of the ore.Based on detailed microscopic and hand specimen observations,this study employs various methods and techniques,including X-ray powder diffraction(XRD),electron probe microanalysis(EPMA),laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS),chemical element analysis,chemical phase analysis,and the mineral liberation analyzer system(MLA).These methods and techniques are used to determine the composition of the ore,identify the types and occurrence states of beneficial and harmful elements,and clarify the ore's processing properties.The results will provide theoretical and technical support for the comprehensive utilization of rare metal resources in the region.The average grade of lithium ore is 0.94%,with approximately 84.7%of Li derived from spodumene.The average grade of Rb_(2)O is 0.13%,meeting the industrial-grade requirements for comprehensive recovery of associated elements.The spodumene exhibits a wide range of grain sizes and is highly heterogeneous,requiring multiple stages of grinding.Based on the liberation characteristics,it is recommended to grind the material to-0.075 mm before entering the final flotation process.