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用光散射技术测定絮团粒度组成来研究一种药剂或组合药剂对细粒分散液的絮凝效果的影响。试验结果表明,絮凝过程包括两个不同方面:颗粒去稳定化和絮团的长大。每个阶段都有各自的药剂要求。添加简单盐或控制pH来压缩双电层可以实现悬浮液的去稳定化。低分子量但高活性的聚合物也可以达到这个目的。向稳定的分散液添加高分子量聚合物可以通过桥联作用产生一定程度的絮凝,但是,这时除了高分子量聚合物用量大外,还有大量的原分散的颗粒留在高浊度的上清液中。另一方面,高分子聚合物可促使预先去稳定化体系中絮团的长大。试验还证明了改进药剂添加顺序的好处。相反的药剂添加顺序(在用高分子量聚合物处理后再添加去稳定化药剂),絮凝效果相当差。
The light scattering technique was used to determine the floc size of flocs to study the effect of one agent or combination of agents on flocculation of fine particle dispersions. The experimental results show that the flocculation process includes two different aspects: particle destabilization and floc growth. Each stage has its own pharmaceutical requirements. Adding a simple salt or controlling pH to compress the electric double layer can achieve destabilization of the suspension. Low molecular weight but high activity of the polymer can also achieve this goal. Adding a high molecular weight polymer to a stable dispersion results in some degree of flocculation by bridging but in this case, in addition to the high amount of high molecular weight polymer, a large amount of virgin particles remain in the high-turbidity supernatant Liquid. On the other hand, macromolecular polymers promote the growth of flocs in destabilizing systems. Trials also demonstrated the benefits of improved pharmacy addition sequences. The opposite order of addition of the agent (after adding the destabilizing agent after treatment with the high molecular weight polymer), the flocculation effect is rather poor.