新型铝硅复合絮凝剂的制备及其絮凝性能研究

以高稳定性的有机硅(TEOS)代替聚硅酸(HS)加入到聚合铝(PAC)中，初步制备了一种新型铝硅复合絮凝剂(TEOS—PAC)。研究了制备过程中的滴碱速度、Si与Al摩尔比和碱化度等因素对该复合絮凝剂絮凝性能的影响，对比了TEOS—PAC与HS—PAC的絮凝效果。研究结果表明，制备TEOS—PAC时滴碱速度要控制适当(流量刻度定位40)；随着Si与A1摩尔比的提高，TEOS—PAC复合絮凝剂的絮凝性能明显增强，最佳Si与A1摩尔比为0．2，最佳碱化度为2．5；在相同条件下，TEOS—PAC的最佳投药量低于HS—PAC，且TEOS—PAC在絮凝过程中形成的絮体沉降性能优于HS—PAC形成的絮体。

Study on Preparation of a New Kind of Aluminum-Silicon Complex Flocculent and Its Flocculating Effect

A new kind of aluminum-silicon complex flocculent (TEOS-PAC) was prepared with adding highly stable organosilicon (TEOS) instead of polysilicic acid (HS) into poly-aluminum chloride (PAC) solution.The effects of dripping rate of NaOH,Si/Al molar ratio and basicity on the flocculent properties were investigated.The flocculation effect of TEOS-PAC was compared with that of HS-PAC.The results show that the dripping rate of NaOH should be properly controlled (at 40 of flux scale);the flocculation of TEOS-PAC increases significantly with the increasing of Si/Al molar ratio;the optimum dosage of TEOS-PAC is less than that of HS-PAC under the optimum conditions of Si/Al molar ratio 0.2 and basicity 2.5;the precipitability of the flocculate with TEOS-PAC is better than that with HS-PAC.