关键词: 聚硅酸铝锌;淀粉;复合絮凝剂;松花江水

Abstract: The poly-silicate-aluminum-zinc-starch ( PSiAZ-St ) flocculant was a new type of organic-inorganic composite flocculant , which was synthesized from polysilicic acid , aluminum sulfate , zinc sulfate and starch .The micro-morphology and structure of PSiAZ-St were studied by scanning electronic microscope ( SEM ) , fourier transform infrared spectrum ( FTIR ) and X-ray diffraction ( XRD ) .The coagulation-flocculation process shows that the optimal conditions for synthesis conditions are that n( Al+Zn)/n(Si) is 1, n(Al)/n(Zn) is 1:9, m(St)/m(Si) is 1, pH value is 1.5.The removal rates of chroma and turbidity could achieve 98% about dealing with Songhua River samples with PSiAZ-St flocculant.

Key words: polysilicate aluminum zinc;starch;composite flocculant;Songhua River