Abstract
(1) Hereunder is given a report of experiment made to investigate the effects of having added small amount of glidants, silicic acid and magnesium stearate, on the repose angle and the bulk volume of potassium bicarbonate with different moisture contents.
The phenomenon that the repose angle and the bulk volume increased with an increase in moisture contents became less observable by the addition of the glidants.
(2) The electrostatic behavior of potassium bicarbonate and sodium bicarbonate was examined by placing them in the electric field.
These bicarbonates were found to be positively charged, which disappeared by the addition of the glidants.
(3) The adhesive characteristics of each of magnesium stearate and silicic acid in the mixed powder system with sodium bicarbonate were examined by means of an optical microscope as well as a scanning electron microscope.
Silicic acid was found dispersed uniformly but intermittently over the surface of the bicarbonate salt, whereas magnesium stearate formed a replica-like film.
