To make flocculent magnetic and to treat sewage using magnetic flocculation. Ferriferous polyacrylamide ( PAM) composite flocculent was fabricated by swelling the PAM macromolecule in an iron(II) / iron(Ⅲ) solution, followed by an in-situ co-precipitation process. The structure and magnetic properties of the obtained samples were systemically investigated by various techniques. It is found that the composite flocculent is superparamagnetic, with the highest specific saturation magnetization and the coercive force of 9. 21 í 10 - 3 A·m2 / g. The major iron composition in the composite flocculent is characterized as Fe3 O4 magnetite, which has a mean diameter of 8 - 18 nm and distributes evenly in the flocculent. The magnetic flocculent keeps good flocculation property, besides its steady magnetism. Therefore, with the aids of magnetic separation technique, effective flocculating settling can be obtained by using the magnetic flocculent to treat high density slimewater.%为了使絮凝剂具有磁性,从而可通过磁絮凝方法处理污水,通过将聚丙烯酰胺(polyacrylamide,PAM)高分子絮凝剂在铁盐溶液中溶胀-原位共沉淀的方法制备了含铁 PAM 复合絮凝剂,利用多种表征手段对复合絮凝剂的结构及磁性进行了系统分析.研究表明：复合絮凝剂中磁性物主要以 Fe3 O4磁铁矿的形态较均匀地分布于 PAM 的高分子结构中,平均粒径8~18 nm；复合絮凝剂在室温下具有超顺磁性,其最高比饱和磁化强度可达9.21×10-3 A·m2/ g.磁性絮凝剂除具有稳定的磁性外,还保持了较好的絮凝特性,将其应用于煤泥水的絮凝沉降过程中,可通过外磁分离技术实现煤泥絮团的高效沉降.
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