以水玻璃、废盐酸为原料，制备聚硅酸，研究表明：在硅酸钠浓度为4%～8%，pH小于4的条件下，室温熟化5h左右，可制得稳定的聚硅酸。将聚硅酸与聚合硫酸氯化铁在一定条件下复合，制备聚硅酸聚合硫酸氯化铁复合型絮凝剂，研究表明：在氯根与硫酸根物质的量比为1∶1，且铁与硅物质的量比为2∶1时，制得的复合型絮凝剂对造纸废水具有最佳处理效果。本研究以废弃物为原料，合成新型絮凝剂，来处理造纸废水，旨在倡导循环经济。

By using the sodium silicate and waste hydrochloric acid as raw materials, polysilicic acid is prepared. The study shows that, under the conditions of the concentration of sodium silicic acid being 4%-8%，the pH＜4， and the reaction time being about 5 hour, the stable polysilicic acid is made. The polysilicic acid is compounded with polyferric chloride sulphate under certain conditions, then the polysilicic acid-polyferric chloride sulphate flocculence is prepared. The study shows that： when the Cl-/SO42-molar rate is 1∶1, the Fe/Si molar rate is 2∶1, the flocculence has the best effect on paper-making waste water treatment. This research takes the trash? as raw material, compounds a new flocculating admixture, then utilizes it to process the paper-making waste water for the purpose of initiating the circulation economy.