聚硅氯化铝混凝剂中Al(Ⅲ)水解聚合历程及铝硅作用特性研究

采用共聚与复合两种制备工艺，制备出了系列具有不同碱化度和不同Ａｌ／Ｓｉ摩尔比的聚硅氯化铝混凝剂，分析研究了ＰＡＳＣ中Ａｌ（Ⅲ）的水解－聚合历程以及聚硅酸与铝水解聚合产物的相互作用，探讨了ＰＡＳＣ溶液的酸解聚。

Study on the hydrolysis-polymerization process of aluminum and the interaction between hydrolyzed aluminum species and polysilicic acid in flocculant polyaluminum silicate chloride(PASC)

A series of polyaluminum silicate chlorides (PASC) with different basicities(B) and Al/Si molar ratios were prepared by means of two methods:one is to add NaOH into the mixed solution of AlCl₃·6H₂O and polysilicic acid at different Al/Si molar ratios,the other is to add polysilicic acid into polyaluminum chloride(PAC) solution with different B at different Al/Si molar ratios.The hydrolysis polymerization process of aluminum and the interaction between hydrolyzed aluminum species and polysilicic acid in PASC were studied and the acid depolymerization of PASC solution was also investigated.The experimental results showed that there are interactions between polysilicic acid and hydrolyzed aluminum species,and these interactions can affect a part in the hydrolysis polymerization process.The intensity of interactions between polysilicic acid and hydrolyzed aluminum species depends on Al/Si molar ratio,the smaller the Al/Si,the more intensive the interaction.The preparation method and the Al/Si molar ratio affect the acid depolymerization of PASC to a little extent.