水镁石粉湿法超细制备和表面改性一体化研究

Ultra-fine and surface-modified of brucite with water

由于粉体在进行超细粉碎后，比表面积增大，表面能升高，颗粒极易团聚，在进行表面改性后，所得粉体有很多大颗粒团聚体。运用行星式高能球磨机，在球磨过程中加入助磨剂，促进颗粒的分散，同时加入表面活性剂，将粉体进行表面改性，一改以前将粉体超细后再进行表面改性，避免了粉体的二次团聚。使用激光粒度分析仪、扫描电子显微镜（SEM）、接触角测定仪等现代分析检测技术对粉体的粒径、形貌和表面性质进行了表征。结果表明，这种超细和改性一体化的处理方法能显著降低水镁石粉的粒度分布并使其形貌均匀，在研磨20min后粉体粒径就降到0．51μm以下，改性后的粉体活化指数高。

The particles can easily reunion, beacause of the superfine powder with big specific surface area, higher surface energy. After conducting surface modification, they become big aggregates. In this paper, we use the high-energy planetary ball mill, in the milling processing, joining aids to Promote the dispersion of particles, at the same time, joining the surfactant for surface modification. By this method, we successfully avoid the second reunion, The use of laser granularity analyzer, scanning electron microscopy （SEM）, contact angle measurement, the powder particle size and morphology were characterized. The results showed that the planetary ball mill can significantly reduce the particle size of brucite powder and make the uniform morphology, the modified powder with high activation index.