Abstract:
Dynamic flocculation process of kaolin suspension particles under the effect of polyacrylamide (CPAM) was studied by using focused beam reflectance measurement and Malvern mastersizer with different concentrations of flocculant and at various flocculation reaction temperatures.Based on fractal theory,the variation of fractal dimension was explored by image processing technique with the help of turbidity meter and microscopic camera.Results showed that the average chord length and particle size of the floc increased gradually in the floc system as the mass concentration of flocculant and reaction temperature increased.After reaching the maximum,the turbidity of system decreased and floc fractal dimension increased as the concentration of flocculant and temperature further increased.When the CPAM mass concentration was 6 mg/L and temperature was 60℃,the optimized flocculation appeared.Further increasing the concentration of CPAM and environmental temperature,the turbidity of system increased and floc fractal dimension slightly decreased.The turbidity of system and floc fractal dimension showed a positive correlation.