云南腾冲高分异花岗岩锂、铷的工艺矿物学特征OA北大核心CSTPCD
Process mineralogical characteristics of Li and Rb in highly differentiated granites in Tengchong,Yunnan Province
为了厘定云南腾冲地区白垩世高分异花岗岩锂、铷的赋存状态以及工艺矿物学特征,并为区域关键金属综合利用提供解决方案,选取水城矿区代表性花岗岩为研究对象,利用扫描电镜、能谱仪及矿石自动测定系统,开展单矿物化学成分、物相、元素赋存状态、矿物嵌布粒度等岩矿相学及工艺矿物学研究.研究结果表明:Li主要赋存在云母类矿物中,Rb主要赋存在长石以及云母类矿物中;云母主要为铁锂云母,其次为白云母,多为形态较规则的片状,与长石、石英相互之间的镶嵌关系较简单;长石以钾长石居多,其次为钠长石,均与云母的镶嵌关系较简单,预计经适度磨矿后云母与长石即可获得较充分的解离;经理论计算,云母精矿产率为5.76%～6.60%;Li2O和Rb2O的品位分别为0.62%～0.73%和0.53%～0.55%;Li2O和Rb2O的回收率分别为91.11%～91.30%和38.20%～39.56%.云母具有不均匀中细粒嵌布的特点,所以选择74 μm的磨矿细度较为适宜,此时样品中95%左右的云母可获得解离.云母与石英、长石相互之间的结合力相对较低,有利于磨矿过程中矿物的解离,因此,实际选矿过程中选择的磨矿细度可适度放粗.云南腾冲地区花岗岩中锂、铷等关键金属具有较好的综合回收利用价值,应引起充分重视.
The aim of this study is to determine the occurrence state of lithium and rubidium and the process mineralogy characteristics of Cretaceous highly differentiated granites in Tengchong(Yunnan Province),and to provide solutions for the comprehensive utilization of key metals in the region.Representative granites from the Shuicheng ore field were selected as the research objects.Scanning electron microscopy,energy dispersive spectroscopy and automatic ore determination system were used to reveal petrographic and mineralogical characteristics,such as chemical composition,physical phase,element occurrence state,and mineral embedded particle size of single mineral.The results show that Li mainly exists in mica minerals,and Rb mainly exists in feldspar and mica minerals.Mica is mainly ferrolepidolite,followed by muscovite,which is mostly in regular sheet shape and has a simple mosaic relationship with feldspar and quartz.Feldspar is dominated by potassium feldspar,followed by albite.The mosaic relationship between feldspar and mica is relatively simple,thus it is estimated that mica and feldspar can be fully separated after moderate grinding.Based on theoretical calculations,the yield of mica concentrate is 5.76%-6.60%and the grades of Li2O and Rb2O are 0.62%-0.73%and 0.53%-0.55%,respectively.The recoveries of Li2O and Rb2O are 91.11%-91.30%and 38.20%-39.56%,respectively.Mica is characterized by uneven medium and fine-grain distribution,and thus it is appropriate to select a grinding fineness of less than 74 μm.Under such a condition,about 95%of the mica in the sample can be dissociated.Mica is mostly filled and distributed along quartz and feldspar grains,and the binding force between them is relatively low,which is conducive to the mineral separation in the grinding process.Therefore,the grinding fineness selected in the actual beneficiation process can be moderately coarsened on the basis.Lithium,rubidium and other key metals hosted by granites in the Tengchong area of Yunnan Province have good comprehensive recycling value,which should be paid full attention to.
欧阳黎明;李欢;周剑琪;谢一鸣;刘飚
中南大学地球科学与信息物理学院,有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙,410083||湖南省国土空间调查监测所,湖南长沙,410129中南大学地球科学与信息物理学院,有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙,410083
地质学
关键金属元素赋存状态综合利用高分异花岗岩锂铷矿石
critical metalselement occurrence statecomprehensive utilizationhighly differentiated granitelithium-rubidium ore
《中南大学学报（自然科学版）》 2024 (003)
982-993 / 12
国家自然科学基金资助项目(92162103);湖南省科技创新计划项目(2021RC4055,2022RC1182);湖南省自然科学基金资助项目(2022JJ30699,2023JJ10064)(Project(92162103)supported by the National Natural Science Foundation of China;Projects(2021RC4055,2022RC1182)supported by the Hunan Provincial Science and Technology Innovation Plan;Projects(2022JJ30699,2023JJ10064)supported by the Natural Science Foundation of Hunan Province)
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