Structure and performance of composite flocculant poly-titanium-aluminum-silicate
聚合硅酸钛铝复合絮凝剂的结构及性能

Inorganic polymeric composite flocculant,poly-titanium-aluminum-silicate(PTAS),was prepared by using sodium silicate,titanium sulfate,aluminum sulfate as raw materials which could avoid secondary dosing and toxicity produced by organic flocculants in treating synthetic river water.The results showed that PTAS exhibited the best turbidity removal rate,up to 92.5% when the n(Ti+Al)∶ n(Si) was 1∶ 3,the n(Ti)∶ n(Al) 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 materials.The infrared spectrums indicated that Si—O—Al bond and Ti—O—Si bond could be formed by titanium,aluminum ions as well as their hydrolysis aggregated product with coexisted polysilicic acid.The laser particle size showed that PTAS particle size was not changed obviously in aggregation process,but larger than polysilicic acid.