The invention provides a spherical NTO (3-nitro-1,2,4-triazol-5-one)
crystal with high crystalline density and a preparation method of the spherical NTO
crystal. The content of NTO in the
crystal is larger than or equal to 99.9%, the
crystal density is larger than or equal to 1.92 g / cm<3>, the short and
long axis ratio of the crystal is larger than or equal to 0.90, and the range of the median particle
diameter of the crystal ranges from 150 mu m to 200 mu m. The preparation method of the spherical NTO crystal with the high crystalline density comprises steps as follows: (1), NTO and a
solvent are added into a reaction kettle for complete
dissolution, and the temperature of the reaction kettle is 40-80 DEG C; (2), the temperature of the reaction kettle is reduced while stirring is performed, a super-saturated solution is formed, and a crystal
nucleus is generated and grows; (3), after the crystal is completely separated out, stirring is performed for 1-5 hours at the low temperature
ranging from subzero 5 DEG C to zero DEG C; (4), filtering,
drying and weighing are performed. The crystal grain
fineness distribution is narrow, appearance observation proves that the
sphericity of the crystal is high, the crystal has a
smooth surface, and no crack is formed on the surface of the crystal.