膨润土中蒙脱石物相的定量分析 - 硅酸盐学报.PDF

第37 卷第12 期 聂建华等：酸处理对皂石层电荷数和膨胀性能的影响 · 2055 · 第37 卷第12 期 硅 酸 盐 学 报 Vol. 37 ，No. 12 2 0 0 9 年 1 2 月 JOURNAL OF THE CHINESE CERAMIC SOCIETY December ，2009 膨润土中蒙脱石物相的定量分析 万红波，廖立兵 ( 中国地质大学(北京)材料科学与工程学院，北京 100083) 摘 要：膨润土中蒙脱石物相定量分析的传统方法分析的精度低，而且由于蒙脱石标准样品很难制得，无法对蒙脱石物相定量分析的结果进行验证和 评估。运用X 射线衍射定量相分析的Rietveld 全谱图拟合法、直接分析法(外标法)和K 值法( 内标法) ，以及吸蓝量法、化学成分分析法，对典型膨润 土样品的蒙脱石进行了定量相分析，讨论了不同分析方法的优缺点，认为Rietveld 全谱图拟合法的分析结果精度和可信度最高。 关键词：膨润土；蒙脱石；定量相分析 中图分类号：P575 文献标志码：A 文章编号：0454–5648(2009)12–2055–06 QUANTITATIVE PHASE ANALYSIS OF MONTMORILLONITE IN BENTONITE WAN Hongbo，LIAO Libing (School of Materials Science and Engineering, China University of Geosciences, Beijing 100083, China) Abstract: There are some disadvantages (such as low accuracy results) of the conventional methods to analyze montmorillonite con- tent in bentonite. Also, it is difficult to verify and evaluate the quantitative phase analysis results of montmorillonite due to the ineffi- cient preparation of pure montmorillonite sample. Methylene blue absorption, chemical composition analysis and X-ray diffraction quantitative phase analysis (Rietveld quantitative phase analysis, calibration curve method and matrix flushing method) were used to determine the content of montmorillonites in some typical bentonites. The advantages and disadvantages of the methods are discussed. The results show that the analytical results obtained by the Rietveld quantitative phase analysis are more accuracy and credibility. Key words: bentonite; montmorillonite; quantitative phase analysis 膨润土是资源最丰富、研究应用最广泛的矿物 由于蒙脱石的晶胞c 轴长度可变，且难与方石 之一。它是以蒙脱石为主