地学前缘 ›› 2011, Vol. 18 ›› Issue (1): 216-221.

• 论文 • 上一篇    下一篇

相混合计算法确定蒙脱石含量的对比研究

李歌,马鸿文,王红丽,张佳娉,刘梅堂   

  1. 中国地质大学(北京) 矿物材料国家专业实验室, 北京 100083
  • 收稿日期:2010-05-08 修回日期:2010-05-21 出版日期:2011-01-15 发布日期:2011-01-15
  • 作者简介:李歌(1984—),女,博士研究生,无机非金属材料专业,主要从事矿物材料的研究工作。Email: jay_vikey@163.com
  • 基金资助:

    “十一五”国家科技支撑计划项目(2006BAD10B04);国家自然科学基金项目(40802013)

Modal analysis of montmorillonite in bentonites using phase mixing equation: A comparative study.

  1. National Laboratory of Mineral Materials, China University of Geosciences(Beijing), Beijing 100083, China
  • Received:2010-05-08 Revised:2010-05-21 Online:2011-01-15 Published:2011-01-15

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摘要：

基于X射线粉晶衍射分析、化学成分分析数据,依据物质平衡原理,应用相混合计算法对陕西洋县、河南确山、内蒙古赤峰三地的膨润土进行了定量物相分析。根据电子探针微区分析所得蒙脱石晶粒化学成分数据,采用以阴离子为基准的氢当量法,计算了膨润土中蒙脱石的晶体化学式。应用CELLSR软件,计算得到膨润土中各主要矿物的晶胞参数。通过与传统的确定膨润土中蒙脱石含量的吸蓝量法和X射线衍射多相Rietveld分析法进行定量对比,结果表明,相混合计算法是确定多种矿物共生的膨润土中蒙脱石含量最有效的物相分析方法。尽管受不同分析方法的误差积累影响,但是由该法确定蒙脱石的含量仍能保证±20％的计算精度。

关键词: 膨润土, 蒙脱石, 物相分析, 相混合方程

Abstract:

 According to the mass balance principle, the mineral contents of the bentonites from Yangxian of Shaanxi Province, Queshan of Henan Province, and Chifeng of the Inner Mongolia Autonomous Region were estimated by solving the phase mixing equation constructed from the data of Xray diffraction, microprobe analysis of montmorillonite grains, and wet chemical analysis of the bentonites. The crystal formulas of montmorillonite in the bentonites were calculated by using the anion hydrogen equivalent method. The cell lattice constants of the principal minerals in the bentonites were calculated with a FORTRAN90 program CELLSR. Compared with both methods of the methylene blue absorption and XRD Rietveld multiphase analysis, the phase mixing equation was confirmed to be the most accurate modal analysis method for determining the content of montmorillonite in bentonites with several minerals coexisted.

Key words:  bentonite, montmorillonite, modal analysis, phase mixing equation

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