摘要
文章考察了采用氯化镁-氢氧化钠常温合成工艺制备的氢氧化镁在典型絮凝体系中的聚沉行为。实验结果表明:常温合成的氢氧化镁颗粒之间静电斥力较大,极难沉降;氯化亚铁和明矾对氢氧化镁无絮凝作用;淀粉和非离子型聚丙烯酰铵由于架桥效应可在一定程度上加速氢氧化镁的沉降;高聚合度阴离子型聚丙烯酰铵具有电荷中和与架桥双重功能,可使氢氧化镁的沉降体积及团聚粒径大幅度增加,聚沉效果显著提高。
The influence of flocculation agents on the sinking of Mg(OH)_2 particles synthesized via MgCl_2-NaOH route at room temperature was studied in this paper.Mg(OH)_2 particles were difficult to sink due to the high surface potential.The existence of the flocculation agents such as starch,nonionic polyacrylic amide or anionic polyacrylamide was favorable for the acceleration of flocculation of Mg(OH)_2 particles,leading to the increase of sinking volume and the cluster sizes of Mg(OH)_2 particles,while little change was observed in the case of FeCl_2 and alum.Among the above flocculation agents,anionic polyacrylamide was most suitable for the flocculation of Mg(OH)_2 particles since it acted as both an electric neutralization agent and an absorption-bridge agent.
出处
《海湖盐与化工》
2004年第3期1-3,20,共4页
Sea-Lake Salt and Chemical Industry
关键词
氢氧化镁
絮凝
微粒
magnesium hydroxide
flocculation
fine particles
