Stability of Preflocculated Calcium Carbonate Filler Flocs

This paper summarises the results of laboratory and pilot scale experiments that were carried out to investigate stability of preflocculated ground and precipitated calcium carbonate filler flocs in terms of their sensitivity to changes in hydrodynamic environment. Filler flocs were produced by treatment of filler suspensions with commercial polymeric flocculants under various process conditions. The experimental results indicate that filler flocculation is a dynamic process in which the important factors are type and amount of flocculant, suspension concentration, turbulence level and time.