聚合硅酸钛铝复合絮凝剂的结构及性能

Structure and performance of composite flocculant poly-titanium-aluminum-silicate

为了克服有机絮凝剂的二次投加及有毒性的缺点,以硅酸钠、硫酸钛、硫酸铝为原料,制备了聚合硅酸钛铝(PTAS)无机高分子复合絮凝剂处理模拟江水。结果表明,在n(Ti+Al)∶n(Si)=1∶3,n(Ti)∶n(Al)=1∶5,模拟江水pH值为5～9.3,絮凝剂投加量为0.3 mmol/L(以金属离子计)时,PTAS对模拟江水的混凝效果最好,除浊率达到92.5%以上。此外,通过X-射线衍射说明聚硅酸与硫酸铝、硫酸钛不是单纯的原料复合;红外吸收光谱显示钛、铝离子及其水解聚合产物可与共存的聚硅酸生成Si—O—Al键和Ti—O—Si键;激光粒度分析表明PTAS在聚合过程中粒度并没有明显变化,但均比聚硅酸粒径大。

Inorganic polymeric composite flocculant, pared by using sodium silicate, titanium sulfate, aluminum poly-titanium-aluminum-silicate （PTAS） , was pre- sulfate as raw materials which could avoid secondary dosing and toxicity produced by organic flocculants in treating synthetic river water. The resuhs showed that PTAS exhibited the best turbidity removal rate, up to 92.5 % when the n （ Ti ＋ A1） ： n （Si） was 1 ： 3, the n （Ti） ： n（A1） was 1 ： 5, the pH value of synthetic river water was from 5 to 9.3, the dosage of flocculant was 0.3 mmol/L. In addition, it was speculated from X-ray diffraction that PTAS was not a simple compound of raw ma- terials. The infrared spectrums indicated that Si--O--A1 bond and Ti--O--Si bond could be formed by titani- um, aluminum ions as well as their hydrolysis aggregated product with coexisted polysilicic acid. The laser parti- cle size showed that PTAS particle size was not changed obviously in aggregation process, but larger than polysi- licic acid