摘要
锂元素由于其广泛的用途,尤其是新能源汽车的飞速发展,已成为当今最炙手可热的矿产资源之一。而在各锂资源类型中,黏土型锂矿由于其分布广、沉积环境稳定及开采成本低等特点,已成为锂的重要来源。元素赋存状态的研究对其开发利用具有科学指导意义,但由于锂元素是最轻的金属元素,在较多检测手段下分析受限,导致了其赋存状态研究难度大。因此对黏土型锂矿中的Li元素赋存状态研究是锂矿开发利用前期工作中的重点及难点所在。本次研究以河北凤山地区黏土岩为研究对象,主要利用LA-ICP-MS原位点、面分析方法,同时结合矿物自动定量分析系统(AMICS)及岩矿鉴定等技术手段,从而探讨样品内锂元素的赋存形式。研究结果表明,该区岩性为砂质黏土岩,主要黏土矿物种类为伊蒙混层(42.11%),同时含有较多碱性长石(15.60%)、石英(13.24%)及斜长石(9.32%)等陆源碎屑物,Li元素含量为0.12%;LA-ICPMS分析结果显示伊蒙混层矿物集合体内锂元素含量平均值为2499.27×10^(−6),占全岩总Li含量的87.70%;在样品焙烧至600℃时,红外结果显示黏土矿物结构发生改变的同时,锂元素的浸出率达82.33%。综合判断,本样品中Li元素主要以阳离子替代的形式赋存于伊蒙混层颗粒内。同时,本次研究建立的锂元素赋存状态的多手段综合研究方法,可为同种类型及相似类型矿产的赋存状态研究提供思路。
With the rapid development of new energy vehicles,lithium has become one of the most sought-after mineral resources.Among the various types of lithium deposits,clay-type lithium resources have gained importance due to their wide distribution,stable sedimentary environments,and low mining costs.However,the analysis of lithium—the lightest metal element—is constrained by many detection methods,making it difficult to study its occurrence in clay-type ores and thereby hindering the development and utilization of these resources.In this study,LA-ICP-MS in-situ point and surface analysis,combined with automated mineralogical analysis(AMICS)and petrographic identification techniques,was applied to investigate the occurrence of lithium in clay-type samples from the Fengshan area of Hebei province.The results indicate that the lithium-bearing rock is sandy claystone,with illite–smectite mixed layers as the dominant clay mineral(42.11%),along with significant amounts of continental clastic minerals such as alkali feldspar(15.60%),quartz(13.24%),and plagioclase(9.32%).The average lithium content of the rock is 0.12%.LA-ICP-MS analysis shows that the illite–smectite mixed-layer minerals contain an average lithium concentration of 2499.27×10^(−6),accounting for 87.70%of the total lithium in the rock.Infrared analysis further reveals that,when heated to 600℃,structural changes in the clay minerals result in a lithium leaching rate of 82.33%.Overall,these results demonstrate that in the clay-type samples,lithium predominantly occurs in the form of cation substitution within illite–smectite particles.
作者
朱丹
康健
白明
童铄云
王晓东
潘诗洋
刘爽
ZHU Dan;KANG Jian;BAI Ming;TONG Shuoyun;WANG Xiaodong;PAN Shiyang;LIU Shuang(Hubei Geological Research Laboratory,Wuhan,Hubei 430000,China;Key Laboratory of Rare Earth Rare and Scattered Minerals,Ministry of Natural Resources,Wuhan,Hubei 430000,China;The Ninth Geological Brigade of the Hebei Provincial Bureau of Geology,Minerals Exploration,and Development,Xingtai,Hebei 054000,China;The Forth Geological Brigade of the Hebei Provincial Bureau of Geology,Minerals Exploration,and Development,Chengde,Hebei 067400,China)
出处
《矿物岩石》
北大核心
2025年第4期49-58,共10页
Mineralogy and Petrology
基金
湖北省自然科学基金项目(编号:2023AFB1104)。
