高濃度粒状石灰窒素の製造に関する研究(第2報) : 湿式製法による粒状石灰窒素の崩壊

概要

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After heating graular calcium cyanamide with urea or calcium nitrate, we measured its expansion, change in weight and also its hardness. Results were as follows : (1) The weight of sample, which was exposed to the air in a room, increased owing to the absorption of water from the atmosphere, but this sample did not show any great expansion and was considerably hard. (2) When the granular calcium cyanamide with urea was sealed after being heated, it showed a severe expansion and collapsed. In the case, when it contained calcium nitrate, it became rather soft and not seemed to have expanded. (3) The explanation that the expansion by hydration of calcium oxide is cause of collapse of the granular calcium cyanamide, was concluded to be incorrect. (4) Loss of water by heating, was concluded to be the cause of collapse of the granular calcium cyanamide manufactured by wet process.
社団法人日本土壌肥料学会の論文
1956-02-05