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研究了ｐＨ和无机电解质对氢氧化铝镁正电溶胶稳定性的影响，发现在ｐＨ５～１０范围内，该溶胶比较稳定地存在；ｐＨ＜５时，发生酸溶解作用；ｐＨ＞１０．５时，因发生表面羟基的脱质子化而使溶胶不稳定性．阴离子的价数越高，聚沉能力越大．降低ｐＨ时，ＮａＣｌ、ＮａＮＯ３、Ｎａ２ＣＯ３和Ｎａ３ＰＯ４的聚沉能力下降，而Ｎａ２ＳＯ４变化不大．一价阴离子的聚沉能力大小顺序是：Ｂｒ－＞Ｉ－＞ＮＯ－３＞Ｃｌ－．阳离子的价数越高，对氢氧化铝镁正电溶胶的稳定作用越强．聚沉动力学研究表明，一价阴离子电解质的聚沉过程可分为快速聚沉和慢速聚沉，在慢速聚沉区，稳定率与电解质浓度成良好的线性关系，这与经典的慢速聚沉理论相一致．还改进了聚沉作用的静态研究方法．
The effect of pH and inorganic electrolyte on the stability of Mg (OH) 2 Mg (OH) 2 positive electrospray sol was investigated. It was found that the sol was relatively stable in the pH range of 5 ~ 10. Acid dissolution occurred at pH <5. , Due to the occurrence of the deprotonation of surface hydroxyl leaving sol instability. The higher the valence of anions, the greater the ability to aggregate. When the pH was decreased, the coagulation ability of NaCl, NaNO3, Na2CO3 and Na3PO4 decreased, while the Na2SO4 did not change much. The order of magnitude of monovalent anions is Br-> I-> NO-3> Cl-. The higher the cation valence, the stronger the stabilizing effect on the magnesium aluminum hydroxide positive electrosol. The study of poly sedimentation kinetics shows that the aggregation process of monovalent anionic electrolytes can be divided into rapid poly settling and slow poly settling. In the slow poly settling zone, the stability and electrolyte concentration have a good linear relationship, which is in agreement with the classical slow Fast convergence theory is consistent. It also improves the static research method of coalescence.