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蒙脱石热处理产物的MASNMR研究

吴平霄1; 张惠芬2; 郭九皋2; 胡澄3; 刘小勇3   

  1. 1. 华南农业大学资源环境学院, 广州 510642; 2. 中国科学院广州地球化学研究所, 广州 510640; 3. 南京大学固体微结构物理国家重点实验室, 南京 210093
  • 收稿日期:1998-10-05 修回日期:1998-11-16 出版日期:1999-08-20 网络出版日期:1999-08-20

MAS NMR Spectra of Montmorillonite and Its Thermal Treatment Products

WU Ping-Xiao1, ZHANG Hui-Fen2 , GUO Jiu-Gao2, HU Cheng3, LIU Xiao-Yong3   

  1. 1.South China Agricultural University Guangzhou 510642 China; 2. Guangzhou Institute of Geochemistry Guangzhou 510640 China; 3. State Key Laboratory of Solid Microstructure Physica, Nanjing University Nanjing 210093 China
  • Received:1998-10-05 Revised:1998-11-16 Published:1999-08-20 Online:1999-08-20

摘要: 本文对广东和平蒙脱石及其热处理产物进行了化学分析、差热和热重分析、 X 射线粉末衍射分析、红外吸收光谱分析、原子力显微镜及魔角旋转核磁共振等研究结果表明, 蒙脱石在热处理温度为500 ~700℃ 时, 其 Si、 Al 的 M A S N M R 谱表现为变蒙脱石的谱学特征加热到659℃ 时,蒙脱石八面体片中的羟基开始脱失, 但层状结构仍然保持, 这种羟基的脱失过程对应着八面体片中 Al ( Ⅵ) 向 Al ( Ⅳ) 的转变温度达到900℃ 时, 与蒙脱石有关的 Si 谱消失, 标志着其层状结构完全被破坏, 并有新的矿物相χ-SiO 产生1000℃ 时, 出现较多的χ= Si O , 同时热产物的 Al 谱发生较大的变化当温度为1200℃ 时, 则出现方英石及莫来石相当热处理温度达到1350℃ 时,方英石及莫来石的含量略有减少, 并出现较多的堇青石相.

关键词: 蒙脱石, 热处理, 魔角旋转核磁共振, 堇青石

Abstract: The montmorillonite in Heping, Guangdong province was studied by chemical analysis, DTA, TG, XRD, IR, AFM and MAS NMR. It is
found that when the temperature is between 500~700℃, The Si and Al spectra of montmorillonite display the spectrum characteristic
of meta-montmorillonite. When the thermal treatment temperature reaches 659℃, the hydroxyl in octahedra sheet begins dehydrating, but the
layer structure is maintaining, this process is corresponding to Al(Ⅵ) turning to Al(Ⅳ) in octahedra sheet. When the temperature reaches 900℃, the Si spectra relevant to montmorillonite disappear, that
means the layer structure of montmorillonite is destroyed, and the new mineral phase χ-SiO2 is found. When the temperature reaches 1000℃,
there is more χ-SiO2 phase produced by phase change, meanwhile the Al spectra of thermal products change greatly. When the temperature reaches
1200℃, cristobalite and mullite phases appear. When the temperature reaches 1350℃, the cristobalite and mullite phases reduce a few, and more
cordierite phases appear.

Key words: montmorillonite, thermal treatment, MAS NMR, cordierite

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