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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、扫描电镜、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 1 2 6℃— 1 48℃时 ,主要脱出吸附水和层间水 ,这一脱水过程是可逆的。当热处理温度达到 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 向 Al 的转变。当温度达到 90 0℃时 ,蒙脱石的层状结构完全被破坏 ,并有新的矿物相 μ-堇青石产生。当温度为 1 2 0 0℃时 ,则出现方英石及莫来石相。当热处理温度达到 1 350℃时 ,方英石及莫来石的含量略有减少 ,并出现较多的含铁堇青石相。
In this paper, the chemical analysis, differential thermal and thermogravimetric analysis, X-ray powder diffraction analysis, infrared absorption spectroscopy, scanning electron microscopy, atomic force microscopy and magic angle spin nuclear magnetic resonance were all performed on the montmorillonite and its heat-treated products in Guangdong. The results show that when the temperature of heat treatment is between 120 ℃ and 148 ℃, the montmorillonite mainly desorbs the adsorbed water and interlayer water. The dehydration process is reversible. When the heat treatment temperature reaches 659 ℃, the hydroxyl groups in the montmorillonite octahedral sheet begin to lose, but the lamellar structure still remains. The dehydroxylation process corresponds to the Al to Al transformation in the octahedral sheet. When the temperature reached 90 0 ℃, the montmorillonite stratified structure was completely destroyed, and a new mineral phase μ-cordierite produced. When the temperature is 1 2 0 0 ℃, then appear cristobalite and mullite phase. When the heat treatment temperature reached 1 350 ℃, the content of cristobalite and mullite decreased slightly, and more iron-containing cordierite phase.