| abstract |
The invention provides a spherical magnesium oxide which has not only high sphericity, but also smooth surface, excellent moisture resistance and filling property, and a method for producing the same.n n n The present invention provides a spherical magnesium oxide by adjusting the boron content and iron content after firing to a certain range, and the cumulative volume basis of 50 obtained by laser light diffraction scattering particle size distribution measurement The% particle diameter (D50) is in a relatively large particle diameter range of 3 to 200 μm, and the true sphericity read from the SEM photograph is a high true sphericity of 1.00 to 1.20, and the surface is smooth, and the moisture resistance and filling are excellent. A predetermined spherical magnesium oxide is provided by the multiplying effect of the boron content of 300 to 2000 ppm and the iron content of 100 to 1500 ppm. |