高岭石-多水高岭石演化系列的红外吸收光谱研究

本文用红外吸收光谱对我国所产高岭石-多水高岭石演化系列的四种不同类型的矿物及其热处理产物进行了初步研究,分析了各类矿物的吸收特征,探讨了它们之间的变化关系和脱水过程在红外光谱上的反映。 实验使用KBr压片法制备样品,在Perkin-Elmer 577型红外分光光度计记录红外光谱图。文中所用样品有江苏苏州与河北宣化的结晶完好的高岭石,广东清远清草岭与湖南谭家山的耐火粘土石,福建德化与湖南四青水库的多水高岭石以及四川叙永大树区与山西阳泉的水合多水高岭石。

STUDY OF INFRARED ABSORPTION SPECTRA ON THE KAOLINITE-HALLOYSITE EVOLUTIONARY SERIES

The infrared absorption features of four minerals including the well-crystallizing kaolinite,fireclay,halloysite and hydrohalloysite occurring in China were analysed,and the effects of ordered-disordered changes and the dehydration process on their IR spectra were discussed in the paper.These four minerals were considered to be a series minerals with similar chemical compositions and crystal structures.Their IR spectra exhibit common absorption feature.With the change of contents of the interiayer water and the evolution of the crystal structures from order to disorder,the IR spectra of these minerals change regularly.The IR spectra of heat-treated products of the four minerals show that the dehydroxyl temperature decreases with the increasing disorder of crystal structure,indicating that the relative stability decreases.Several wide bands with similar wave numbers to that before resolution,were preserved in the IR spectra of all dehydroxyl products,which may be a sign that the crystal structure had not totally collapsed.In the high frequency regions of the spectra of partly dehydroxyl product of the fireclay,the halloysite and hydrohalloysite peak shapes appear to be the same as that of the hydroxyl of the well-crystallizing kaolinite.