以焙烧膨润土为原料合成白榴石工艺研究

Synthesis of leucite from calcined bentonnite

以焙烧膨润土为原料,添加一定量的硫酸钾和硫酸铝,利用熔盐法合成了白榴石晶体。采用正交试验分析法,研究了钾硅物质的量比、煅烧温度和保温时间对白榴石合成过程的影响,并确定了合成白榴石的优化工艺条件。采用热重-差示扫描量热分析(TG-DSC)、X射线衍射分析(XRD)和扫描电子显微镜(SEM)对样品进行了表征,进而提出白榴石合成机理。

Lecite crystals were synthesized by molten salt method and with calcined bentonnite as raw material.For synthe- sis process, certain amount of potassium sulfate and aluminum sulfate were added.By using orthogonal testing analysis, the effects of K/Si amount-of-substance ratio, calcinate temperature, and holding time on the synthesis process were investigated, and the optimum technological conditions of synthesis leucite crystals were determined.The samples were characterized by thermogravimetric analysis （TG-DSC）, X -ray diffractometer （XRD）, and scanning electron microscopy （SEM）, and the formation mechanism of leucite was proposed.