Fouling by aqueous suspensions of kaolin and magnetite

Abstract

Experimental studies on particulate fouling were carried out in annular cross sections using aqueous kaolin and kaolin- magnetite suspensions . Tests with kaolin-water suspensions showed that the pH and the ions in solution have a significant effect on the 8.DX)UDt of deposit . Increasing the pH above I , the 8.DX)unt of deposit tends to decrease . However the extent to which the thickness decreases is very much dependent on the chemical substances used to control the pH . The presence of magnetite in kaolin suspensions at pH= 1 .5 reduced the amount of deposit , although increasing its mechanical strength. This seems to be due to the magnitude of the adhesion forces between the particles, which is greater in the presence of iron oxide.