Abstract
Heating the granular calcium cyanamide at 150℃, we measured the expansion of it and got results as follows : - 1. During the heating process, almost all calcium oxide is slaked and great expansion is observed. 2. About 10 minutes after the beginning of heating, maximum of volume is observed. 3. The granular calcium : cyanamide which was subjected to heating 30 minutes at 150℃ contains very little calcium oxide. 4. As for the granular calcium cyanamide manufactured by the wet process, there is very little possibility of collapse which is caused by hydration of unslaked calcium oxide.
