Abstract
The interfacial electrokinetic potential (zeta potential) and the dielectric dispersion were measured as the electrical properties of precipitated CaCO3 suspension containing various electrolytes, and based on these data, the filtration behaviors were observed.
The results obtained are as follows.
(1) Concerning the stabilizing process of the suspending particles due to the addition of sodium hexameta-phosphate, the increment of average specific resistance α of filter cakes corresponds closely to the changes of the zeta potential ζ and the dielectric properties.
(2) On the process to be unstable in the case of CaCl2 or Ca(OH)2 addition, the resistance α also relates closely to the interfacial electrical properties.
From these observations, the following type of empirical equation can be derived.
|ζ|=k(α-α0)s
Here, α0 is the average specific resistance at ζ=0 and is inherent to the suspending system. k and s are constants representing the dependency of α on the zeta-potential.
