【摘要】 锂是我国重要的战略金属资源,锂辉石是伟晶岩型锂矿床中最重要的工业矿物之一。有效、合理圈定锂矿体、评价锂矿床的开发利用价值、深入研究锂矿成矿机制,锂元素含量的准确测定具有重要意义。本文以新疆维吾尔自治区的卡鲁安、大红柳滩和镜儿泉锂矿床中锂辉石单矿物为研究对象,首次开展了伟晶岩型锂矿床中锂辉石单矿物锂元素ICP-MS和ICP-AES分析方法准确性对比研究。本文选取三个锂矿床共22件具有代表性的锂辉石单矿物样品,采用高压密闭湿法消解法,对ICP-MS和ICP-AES分析方法测定锂元素的工作条件(包括雾化气流速、辅助气流速、等离子体流速等)进行了详细探讨。测定结果表明,针对同一份锂辉石单矿物消解溶液,ICP-MS分析方法得到的锂元素存在系统性误差,较ICP-AES分析结果,结果偏差约2.8倍,锂元素含量损失近64.8%。同时进一步对ICP-MS测定锂元素结果的系统误差可能来源作了分析,提出目前技术条件下ICP-MS溶液分析方法用于测定锂辉石单矿物的锂元素含量尚不可取,宜采用操作简单、耐盐度高、无需内标校正的ICP-AES分析技术。更多还原

【Abstract】 Lithium is one of the well-known strategy metal resources in China. Among various minerals in lithium deposits, spodumene is the major mineral showing great commercial value. For effective estimation of lithium levels and deep investigation of the mining process of lithium deposits, accurate lithium determination is of pivotal significance. In this present work, with spodumene mineral in Kaluan, Dahongliutan and Jingerquan lithium deposits of Xinjiang province as the research subject, we first study the analytical accuracies of ICP-MS and ICP-AES for lithium in detail.Herein, 22 representative spodumene samples from the three lithium mining zones are decomposed using high-pressure closed acidic digestion method and taken for lithium analysis by ICP-MS and ICP-AES.The operating parameters,such as nebulizer gas flow rate, auxiliary gas flow rate and plasma gas flow rate, are well studied.With lithium quantification in the same digestion solution analyzed by both methods, results reveal that there exists systematical error of ICP-MS technique, showing an error coefficient of around 2.8 to the data that from ICP-AES analytical method.Furthermore, the possible reasons causing the systematic bias of ICP-MS technique are fully discussed,and it can be inferred that ICP-MS solution analysis, which has analytical loss of approximately 64.8% for lithium in spodumene samples, isn’t recommended in the study of lithium minerals, whilst ICP-AES is an attractive technique with merits of higher accuracy, internal standard free and easier operations.更多还原