Keywords: 
• poly-ferric-silicic sulfate /
• solidification /
• shape /
• coagulation

Abstract: Poly-ferric-silicic sulfate(PFSS)with different Si/Fe molar ratios was prepared using water glass,ferrous sulfate and sodium chlorate by co-polymerized method,and was solidified with the two following ways:(1)gel samples were made by aging at room temperature without dilution;(2)powder samples were made after drying dilute from different reaction time.The exterior shapes and constitutes of solid PFSS were observed and analyzed with scanning electron microscope(SEM) and X-ray Diffractionmeter(XRD),respectively.The results indicate that exterior shapes of solid PFSS are completely different due to the difference of the preparation method: gel samples are a type of compact structure without holes,while powder samples are incompact structure with many holes and are made of curl slice or crystal palpus with different Si/Fe molar ratios,and Si/Fe molar ratio has great influence on the exterior shapes of PFSS.PFSS is not a simple mixture of raw materials but a complexation formed by polymerizing Si,Fe molar and other ions.Influence of reaction time on the performance efficiency of solid PFSS is more obvious than that of liquid PFSS,so different time is needed in preparing solid PFSS compared with that in liquid PFSS.Compared to liquid PFSS,turbidity removal by solid PFSS decreases as the increasing of Si/Fe molar ratio,in comparison with the increase in removing UV254,so different Si/Fe molar ratio should be selected to be solidified in treating different waters.The coagulation performance of solid PFSS can be improved with the increasing of the precipitation time.