贵州高岭土的物质成分和热物理特性研究

A Study on the Compositions and Thermophysical Characteristics of Kaolin in Gu izhou Province

利用X 射线衍射、电子探针、电子顺磁共振和红外光谱对贵阳、遵义和修文等地高岭土的物质成分和热物理特性进行了研究。根据高岭土的化学和矿物成分、颜色形成机理和白度 ,说明高岭土样品中含有铁和钛 ,并研究了它们对高岭土白度的影响。不同地区高岭土样品的结构、形态、白度和颜色是不同的。高岭土中铁和钛存在的形式对其白度具有重要影响。此外 ,还测定了高岭土的热物理特性 ,发现了贵州高岭土具有小的热膨胀系数和高的发射率 ,它的相变产物是莫来石和方英石。

Kaolin samples collected from Guiyang, Zunyi, Xiuwen and ot her localit ies of Guizhou Province were analyzed by means of X-ray diffraction, electron m icroprobe, electron p aramagnetic resonance and infrared spectrometry for their compositions and therm o physical characteristics. The chemical compositions, mineral compositions and me chanism of coloration and whiteness of kaolin provide strong evidence suggesting that the kaolin samples contain iron and titanium. In addition, studies have al so been made on the influence of iron and titanium on the whiteness of kaolin. K aolin samples from different localities are different in texture, shape, whitene ss and color. The existing forms of iron and titanium in kaolin have a great eff ect on the whiteness of kaolin. Moreover, the thermophysical characteristics of kaolin have also documented, demonstrating that kaolin from Guizhou Province is characterized by low thermal expansion coefficient and high emittance. The produ cts of phase transition of kaolin are mullite and cristobalite.