Influence of various types of inorganic salts on dispersion mechanisms of comb-type polymer containing grafted polyethylene oxides chains

This paper discusses the in influences of various types of inorganic salts on the fluidity of inorganic particle suspensions with comb-type polymer. B y addition of anion which form insoluble salt with Ca2+, the fluidity of su spension with polymer and the amounts of polymer adsorbed on CaCO3 were rem arkably reduced. It is thought that the adsorption of polymer is related to the concentration of Ca2+ in the liquid phase, When the concentration of C a2+ in the liquid phase is reduced, the adsorbed amount of Ca2+ on the surf ace of CaCO3 decreases. By addition of soluble Ca salts or CaO, the fluidit y of suspension with polymer and inorganic electrolytes containing anions w hich form insoluble salt with Ca2+ could be greatly improved, up to almost the same value of a suspension without inorganic electrolytes. This is beca use almost all the anions precipitated as insoluble Ca salts or the concent ration of Ca2+ or cations such as Al3+ in the liquid phase increased and, a s a result, the adsorption site of polymer increased.