Electrokinetic Properties of Perlite

as a catalyst in chemical reactions an abrasive; and as an Electrokinetic properties of expanded and unexpanded perlite agent in mixtures for oil well cementing (1). samples have been investigated using the microelectrophoresis However, no studies about the surface interactions that technique. Perlite samples yield practically no isoelectric point in occur at the interface when perlite is incorporated into aquethe pH range of 3 to 11. Both of the perlite samples remain negaous dispersions have been found. Therefore, the electrokitively charged in the pH range studied. The expanded perlite has netic properties of both the unexpanded and expanded perlite a more negatively charged surface than unexpanded perlite. NaCl, have been investigated in this study. KNO3, NaNO3, Na2CO3, and Na2SO4 are indifferent electrolytes for perlite whereas AlCl3 and CaCl2 change the interface charge 2. MATERIALS AND METHODS from negative to positive. Acid-activation has no significant effect