官板乌素富锂煤锂同位素地球化学特征及其指示意义

发布时间：2018-05-04 07:51

  本文选题：MC-ICP-MS + 煤中Li同位素　； 参考：《河北工程大学》2017年硕士论文

【摘要】：中国煤中发现了Li的富集情况并被认为富有很高的经济价值。因此对煤中Li的研究成为煤科学领域的又一重要话题。在地球化学领域里,Li同位素被视为杰出的示踪元素,已被用到很多领域解决诸多地球化学的现象,并取得了丰硕成绩。因此煤中的锂同位素的研究将有助于厘清煤中Li的来源问题。国内目前涉及到煤中Li同位素的研究工作还很少,想要把这一有效手段运用到解决与煤相关的地质应用问题,最重要的是形成煤中Li同位素相关的解析思路。本研究首先对Li含量不同的三种煤元素标准样品(SARM18、SARM19、SARM20)探讨了合适的Li同位素前处理的方法,然后进行同位素的精确测定,建立起煤中Li同位素的分离及测定方法。然后对官板乌素富锂6#煤样品进行了Li同位素特征分析,并结合对煤层夹矸和物源区花岗岩的Li同位素研究,初步得出以下认识结论:(1)利用微波消解技术,使用HNO3-HF酸体系消解煤样,三种煤元素标准样品测得的Li元素含量与推荐值在误差范围内保持一致。(2)使用0.5 N硝酸作为淋洗液,运用AG 50W-X12阳离子交换树脂柱完成一遍过柱,过柱后Na/Li1,有效将煤中Li同位素分离富集。(3)官板乌素6#煤样的Li同位素+6.03‰到+8.49‰之间,平均值+7.04‰。研究结果表明,本研究建立的煤中Li同位素分离测定方法,满足煤中Li同位素分析的需要。得出6#煤高含量的Li主要存在于高岭石当中的结论。这为进一步研究煤中锂的来源提供了铺垫。
[Abstract]:Li enrichment has been found in Chinese coal and is considered to be of high economic value. Therefore, the study of Li in coal becomes another important topic in the field of coal science. Li isotopes are regarded as outstanding tracer elements in geochemistry and have been used in many fields to solve many geochemical phenomena. Therefore, the study of lithium isotopes in coal will help to clarify the source of Li in coal. At present, there are few researches on Li isotopes in coal in China. If we want to apply this effective method to solve the geological application problems related to coal, the most important thing is to form the analytical thinking of Li isotopic correlation in coal. In this study, three standard samples of coal elements with different Li contents, SARM18, SARM19 and SARM20, were studied firstly. The suitable pretreatment method of Li isotopes was discussed, then the accurate determination of isotopes was carried out, and the separation and determination of Li isotopes in coal were established. Then, the Li isotopic characteristics of Guanbanwusu Li-rich 6 # coal sample are analyzed, and the Li isotopic study of the gangue and granite in the source area of coal seam is studied. The following conclusions are drawn preliminarily: 1) Microwave digestion technology is used. Coal samples were digested by HNO3-HF acid system. The content of Li in the standard samples of three kinds of coal elements was consistent with the recommended value within the error range.) 0.5 N nitric acid was used as the eluent and the AG 50W-X12 cation exchange resin column was used to complete the column. After the column, Na / L _ 1 can effectively separate and enrich the Li isotopes in coal. 3) the Li isotopes of Gangbanwusu 6 # coal samples range from 6.03 鈥，

本文编号：1842204