Features and mechanism for coagulation - flocculationprocesses of polyaluminum chloride

The coagulation flocculation experiments for kaolinite suspension were carried out withpolyaluminurn chloride of various basicities. The rnicroelectrophoresis mobility and adsorption of alu-minum species were determined simultaneously. The quantitative relations between the surface cover-age, zeta potential change and coagulating species were investigated to draw up a coagulation- stabilrtydiagram. The mechanism of high efficient coagulation effects for pre - produced polyaluminurn chloridewas discussed on the basis of the experimental results.