【摘要】 本文研究的体系是单硅酸和聚合度不同的多硅酸溶液。测得可溶硅酸聚合为胶体硅酸的反应是二级反应。当存在F^-,而F^-/SiO₂≤0.5时,由于F^-参与聚合反应,使聚合速度增加,聚合速度正比于硅酸浓度的平方和F^-浓度的一次方;而F^-/SiO₂>0.5时,聚合速度则逐渐下降。讨论了F^-对聚合作用的影响。 用三种不同的方法制备了胶体硅酸,对它们的性质以及与乳化的关系进行了研究,并与萃原液进行了比较。本文也讨论了硅引起乳化的机理。更多还原

【Abstract】 The system investigated are the solutions of monosilicic acid and poly silicic acids with different polymerization degrees. The ’reaction of (he spontaneous polymerisation of soluble silicic acid to form colloidal silicic acid was determined to be a second order reaction. When F~ion present has a concentration ratio F-/SiO2≤0.5, the rate of polymerization increases due to the fact that fluoride ions take part in the polymerization. The rate of polymerization is proportional to the square of the concentration of silicic acid, as well as to the concentration of fluoride ions. When F-/SiO2 is larger than 0.5, the rate of polymerization gradully decreases. The effects of fluoride ions on the polymerization were discussed.Three methods were used to prepare colloidal silicic acid and their properties and influence on the emulsification were investigated. The comparison between the colloidal silicic acid solutions and the leach liquor was made. The mechanism of the emulsification caused by silicon was also discussed in the present paper.更多还原