Abstract
The adsorption behavior of various water soluble polymers with different ionicities on ceramic particle surfaces was investigated in order to control the flocculation from an electrokinetic and rheological point of view. The results are summarized as follows: (1) Various water soluble polymers with different ionicities adsorb on high affinity sites in ceramic particles containing SiO and/or Al (O, OH). The cationic polymer mainly adsorbs on negatively charged SiO sites (adsorbs on Al (O, OH) sites above the isoelectric point of alumina). The anionic polymer adsorbs on positively charged Al (O, OH) sites. And the nonionic polymer adsorbs on Al (O, OH) sites (adsorbs on SiO sites at low pH). (2) In many polymer-powder systems showing both affinity and low yield stress of polymer solution at low pH, the amount of polymer adsorption increases with decreasing pH, and vice versa. There are two systems at high pH which show attraction such as alumino-silicate/cationic polymer or repulsion such as alumina/anionic polymer.
