铁量、硅量与聚硅酸铁絮凝性能的关系

成功制备了具有良好稳定性的、不同铁硅比的聚硅酸铁(PFS),对高岭土悬浮液有很好的絮凝效果。实验结果表明:铁量是决定聚硅酸铁絮凝性能的主要因素,铁量在9~32 kg/t时,聚硅酸铁具有较好的絮凝性能,其最佳值在24~27 kg/t之间,此时上清液透光度达到95%以上。在最佳铁量范围内,硅量决定最终絮团体积的大小,硅量大则最终絮团体积大,上清液透光度略高,絮凝性能也略优。电动电位测定结果表明,在聚硅酸铁作用下高岭土颗粒表面电位由负变正。

Relationship between iron consumption, silicon consumption and flocculation characteristics of PFS

Polymers of ferric-polysilicate (PFS)with different Fe/Si mole ratios were prepared and showed satisfactory stability. The prepared PFS showed good flocculation effect on the turbid water of kaolin. The results showed that the iron consumption played a decisive role on the flocculation characteristics of the PFS. The flocculation effect was good when the iron consumption was between 9 and 32 kg/t, and was considerably perfect for the iron consumption of 24 to 27 kg/t that produced the supernatant with maximum transmittance of above 95%. When the iron consumption is most proper, the ultimate floccules volume is dependent on the silicon consumption,and greater silicon consumption corresponds to larger ultimate floccules volume and higher supernatant transmittance. Zeta potential measurements show that the PFS can change the zeta potential of kaolin from negative to positive.