聚合硫酸铝铁的絮凝效果及其流变性能研究

ON THE FLOCCULATING PROPERTIES AND THE RHEOLOGICAL BEHAVIOR OF POLY-FERRIC ALUMINOUS SULFATE COAGULANTS

以硫酸亚铁（FeSO4·6H2O）和硫酸铝[Al2（SO4）3·18H2O]为原料，以硝酸（65％）为催化剂，设计出一条新工艺，合成了无机高分子絮凝剂一聚合硫酸铝铁（PFAS）。通过除浊实验，发现PFAS的适宜投加量为2～4mg／L，最佳沉降pH值为7，最佳沉降时间为30min。与其它絮凝剂的比较表明，PFAS絮凝剂除浊效果最佳。用AR500流变仪对PFAS的剪切弹性模量和粘性模量进行了测量，发现在低频区间，G’、G”的扫描曲线符合牛顿型流体行为；在高频区间，G’、G”为非牛顿型流体行为。选用离散谱仅用两个并联Maxwell模型即可较好地拟合测量曲线。

A new process of preparing poly - ferric aluminum sulfate （PFAS） coagulant of inorganic composite polymer is designed by using ferrous （ FeSO4 · 6H2O ） and aluminum sulfate [ Al2 （ SO4 ）3 · 18H2O ] as raw materials. Flocculating property of PFAS was studied and compared with other three coagulants. Experiment results show that the optimum dose of PFAS is 2 -4mg/L,optimum sedimentation pH value is 7 ,optimum sedimentation time is 30 min. PFAS is the best among the four coagulants in terms of flocculating properties . In addition, shear elastic and viscous moduli （ G＇ and G＂） of PFAS were measured by a rheometer AR500. The results show that G＇ approximately equals G＂, which appears as Newtonian fluid behavior in the range of lower angular frequency. Choosing discrete spectrum relation, two -element Maxwell model properly fits the data.