Retention aid systems of cationic microparticles and anionic polymer: experiments and pilot machine trials

Inorganic cationic microparticles were used in the development of a novel r etention aid system based on synthetic water-based colloidal alumina. Fille r flocculation was effective when the cationic microparticles were used in conjunction with an anionic polyacrylamide of high molecular weight and low charge density. Moreover, these retention systems of cationic microparticl es and anionic polymer are insensitive to shear stress and pH. The results obtained from pilot machine trials showed good agreement with the laborator y findings.