CORONARY SECONDARY CALCIUM PHOSPHATE DIHYDRATE, SOIL IMPROVER THEREWITH, DENTAL POLISHING AGENT, AND PRODUCTION METHOD OF CORONARY SECONDARY PHOSPHATE DIHYDRATE

摘要

To provide coronary secondary calcium phosphate dihydrate that is DCPD of which performances such as the solid-liquid separability, transportability, and permeability in soil and in water were improved.SOLUTION: Coronary secondary calcium phosphate dihydrate is coronary secondary calcium phosphate dihydrate having a coronary shape in which fine particles are radially flocculated, when in the coronary secondary calcium phosphate dihydrate, the particle size distribution based on a volume is represented as a polygonal line graph based on a histogram, the polygonal line graph is represented by taking a grade showing a particle size by a logarithm on a horizontal axis, and by taking a degree of number showing the number of particles on a vertical axis, the polygonal line graph shows the particle size distribution similar to a normal distribution, and has a shoulder structure provided on a side where the grade is smaller than the grade where the number of grade becomes a maximum.SELECTED DRAWING: Figure 1