高温热处理叶腊石呈色变化机制初探

摘要

采用反射光谱﹑化学分析﹑差热分析﹑傅里叶红外光谱及场发射扫描电镜等对叶腊石原矿粉体及其不同温度下煅烧后粉体的呈色变化机制进行研究。结果表明：随着煅烧温度的提高，叶腊石粉体的呈色出现由灰白至淡红并最终呈现雪白的渐变特征，相比于原粉的片状形貌特征，不同温度煅烧粉体微结构无明显改变，叶腊石原粉在高温煅烧后的呈色与粉体微结构及其中所含有机物成分无直接联系。%　　The coloring mechanism of pyrophyllite before and after heating were investigated respectively by reflection spectra,chemical analysis,differential thermal analysis (DTA),Fourier transform Infrared spectroscopy (FT-IR) and field emission-scanning electronic microscope (FE-SEM).The results show that the color of pyrophyllite powder changes from grayish white to light pink and turns to the color of snow-white finally with increasing firing temperature. Compared to the original pyrophyllite, the laminal microstructure of pyrophyllite has no changed after high-temperature heating, and its microstructure and organic composition do not play a role in the coloring of the pyrophyllite.