热改性对酸活化低品位凹凸棒石的影响

摘要

The dehydration,structural and morphological properties of acid-modified low-degree palygors-kite during heat treatment was studied by thermogravimetric and differential thermal analysis,X-ray dif-fraction,X-ray fluorescence,high resolution transmission electron microscopy and flourier transform infra-red spectroscopy.The results showed that with the increase of calcination temperature,the water of adsorp-tion,crystallization and structure of the low-degree palygorskite with acid-modified were removal in turn, and the apparent whiteness of palygorskite is declining,however,the contents of main oxides such as SiO2,Al2O3,Fe2O3and MgO were changed little. The crystal structure of low-degree palygorskite was destroyed when the calcinations temperature was higher than 600 ℃.%通过热重、X 射线衍射、X射线荧光光谱、透射电镜、傅里叶变换红外光谱等综合分析,研究了酸活化低品位凹凸棒石在热处理过程中脱水作用与组成、结构、形貌变化之间的关系.结果表明,随着焙烧温度的提高,酸活化低品位凹凸棒石中的吸附水、结晶水和结构水依次脱出,凹凸棒石的表观白度下降,主要氧化物SiO2、Al2O3、Fe2O3、MgO含量变化不大,焙烧温度高于600 oC时,酸活化低品位凹凸棒石的孔道坍塌,晶体结构遭到破坏.