Abstract
The effects of varying the rotational speed (energy), settling time and shaking time were measured on the laboratory dispersant test; the swirling flask test. Dispersant effectiveness onset between 100 and 150 rpm, indicating a threshold process for dispersion. The dispersant effectiveness increased slowly after the onset with increasing rotational speed. The settling time changes effectiveness very much between 5 and 80 min. Change was especially rapid at 5 min. The amount of shaking time did not change the effectiveness significantly. This is also indicative of a threshold dispersion process.
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