The present invention is related to a magnesium oxide particle aggregate with
the requirement of a first inflection point diameter is more than 0.3010-6
to 0.6010-6 m, a particle void volume is 0.5010-3
to 0.9010-3 m3kg-1, and a micropore
volume is 0.0410-3 to 0.1110-3 m3kg-1
in the cumulative intrusion volume curve of said particle by having controlled
particle aggregation structure so that the solid phase-solid phase reaction between
magnesium oxide and the SiO2 film on the surface can be appropriately controlled.
