本文利用动态法研究了电解质对氢氧化铝镁正电溶胶 (以下简称溶胶 )的聚沉作用 ,发现一价阴离子对溶胶的聚沉效率大小顺序为Br->I->NO-3 >Cl-,与经典的感胶离子序不相同 ;在体系的PH =9.4时高价阴离子对溶胶的聚沉能力大小与叔采—哈德规则不相符 ;阳离子价数越高 ,对正电溶胶的稳定作用越强。 In this paper, using the dynamic method, the effect of electrolyte on the precipitation of Mg (OH) 2 Mg-positive sol was investigated. The results showed that the order of concentration of monovalent anion to sol was Br-> I-> NO- 3> Cl- , Which is not the same as that of the classic chelating micelle. At the pH of 9.4, the coalescence ability of the high-valent anion on the sol does not accord with the tertiary-Haddue rule. The higher the cation valence is, the stabilizing effect on the positive electrosol The stronger.