萃取界面乳液的固体微粒稳定机理

来源期刊：中南大学学报(自然科学版)2004年第1期

论文作者：刘晓荣 邱冠周 胡岳华 杨俊和

文章页码：6 - 6

关键词：溶剂;萃取;固体微粒;乳化;粒度分布;界面膜;聚结;稳定性

Key words：copper solvent; extraction; solid particle; emulsification; droplet size distribution; interfacial film; coalescence; stability

摘    要：对铜溶剂萃取时萃原液中固体微粒稳定界面乳化液的机理进行了研究。研究结果表明:固体微粒是促进界面乳液形成和稳定的关键因素,它通过3种机制稳定界面乳化液:一是减小乳化液滴粒度和粒度分布区间,当萃原液中固体微粒的质量浓度由0.138 g/L增加到2.918 g/L时,液滴平均粒径由346.7μm减小到25.5μm,48 h后破乳率由84%降低到27%;二是在液滴界面形成固体复合界面膜对液滴起保护作用;三是以微粒絮团的方式填充于液滴间隙中,阻断液滴接触,防止液滴聚结破乳。

Abstract: The effects of solid particles on stability of interfacial emulsion in copper solvent extraction was studied. The results show that solid particles control the formation and stability of interfacial emulsion, the solid particles make the emulsion stabilized not only by forming solid film at the interface but also by filling in interspaces between droplets to obstruct droplets coalescence, meanwhile, decreasing average droplet size and narrowing droplet size distribution lead the emulsion more stable. With increasing solid particle content from 0.138 to 2.918 g/L, the average droplet size reduces from 346.7 to 25.5μm, and the demulsification rate decreases from 84% to 27%.