摘要：为了实现碳酸钙颗粒在水中聚团, 实现碳酸钙固液分离及与其他物质的分离, 通过测量颗粒的沉降指数和观察颗粒的显微图像, 对硬脂酸钠改性碳酸钙颗粒在水介质中的聚团行为及其机理进行研究。结果表明, 碳酸钙表面诱导疏水性是导致其颗粒聚团的主要因素, 与未改性碳酸钙相比, 改性碳酸钙颗粒在水介质中形成大尺度聚团, 并具有一定强度;推测改性碳酸钙颗粒间的聚团应为颗粒表面改性剂碳链间的缔合所形成。

关键词：疏水聚团；碳酸钙；表面改性

Abstract：To separate calcium carbonate from suspension or other substances through getting calcium carbonate particles agglomerating in the water, the behavior of calcium carbonate particles modified by the sodium stearate in water medium and its mechanism were studied. The results show that the agglomeration of particles mainly determined by the induced surface hydrophobicity. Compared with the unmodified calcium carbonate, the modified calcium carbonate particles agglomerate to larger particles with certain strength in water medium. It's inferred that the agglomeration of modified calcium carbonate particles induces by the association of modifier carbon chain on the particles surface.

Keywords：hydrophobic agglomeration；calcium carbonate；surface modification