两种半水石膏形态特征的电子显微镜研究及其形成机理的探讨

MORPHOLOGICAL INVESTIGATIONS OF THE BASSINITES BY ELECTRONIC MICROSCOPE AND THEIR FORMATION MECHANISM ANALYSIS

用天然二水石膏单晶进体行了脱水制备半水石膏的试验 ,分别制备了 α半水石膏和 β半水石膏。对其形貌特征进行了扫描电子显微镜观察 ,发现它们的形貌特征有很大的差异。结合其 X射线衍射图谱 ,分析了它们的形成机理。指出造成 β半水石膏经可溶性硬石膏向不溶性硬石膏转变温度比 α半水石膏高的原因是由于其结晶程度比前者差 。

Dehydration experiments were carried out to prepare bassinite from well crystallized natural gypsum.With the different techniques,α bassinte and β bassinite were prepared from gypsum respectively.Electronic microscopic observation clearly shows that the two bassnites are very different from each other in morphology.As a result of the study,combined with XRD patterns,their formation mechanims are analysized.It is concluded that it is the difference of β bassinite from α bassinte in crystallinity that causes a higher trannformation temperature of β bassinite to insoluble anhydrite through soluble anhydrite than that of α bassinite.