Compositions and Performance Characteristics of Some Commercial Polyacrylamide Flocculants

CIM Bulletin, Vol. 71, No. 793, 1978

D. W. Rogers and G. W. Poling, Department of Mineral Engineering, University of British Columbia, Vancouver, B.C. (Mr. Rogers is now with Trophic Canada Ltd., Penticton, B.C.)

Several commercial polyacrylamide flocculants most widely used in Western Canadian mineral processing plants have been analyzed chemically and compared in standardized settling tests as aids to thickening and clarification. Data are included for both dry and liquid-type flocculants. Percentages of active ingredients in these commercial products varied widely. Performances were compared on the basis of: equal additions of active ingredients, nearly equal molecular weights and nearly equal degrees of ionic character. Based on zone settling velocities and supernatant clarities of siliceous slurries coagulated by lime additions, dry flocculants proved more economical than liquid flocculants. Using these same two criteria, the most highly anionic were more effective than either weakly anionic or nonionic poly-acrylamide-type flocculants.
Keywords: Metallurgy, Polyacrylamides, Flocculants, Silcosil, Polymers, Settling tests, Mineral processing.