The effects of some electrolytes on flocculation with a cationic polyacrylamide

The effects of sodium chloride, sodium sulfate, and alum (aluminum sulfate) on the performance of a cationic polyacrylamide flocculant in a papermaking suspension consisting of bleached (hardwood: softwood, 50∶50) kraft wood-pulp fibres and anatase (TiO2) were investigated. Sodium chloride and sodium sulfate, 1×10−5 to 1×10−2 M, in the presence of polymer, caused negligible changes in the electrophoretic mobility of the TiO2 and in the …