Abstract
Suspensions of 1.6 μm silica microspheres have been flocculated in a stirred vessel with cationic polymers differing in structure, charge density, and molecular weight. Using particle analysis by Coulter Counter relative r??es of flocculation were obtained and optimal flocculant concentrations defined. Under given conditions the optimal concentration corresponded to that required for zero particle mobility. The rate of polymer flocculation and the optimal dosage were found to depend on the polymer charge density and molecular weight. An explanation in terms of uneven charge distribution on the particles and adsorbed segment bridging is proposed. Ionic strength was found to affect flocculation rates and optimal polymer doses.
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