Patent ID: 11879054
Assignee: TATEHO CHEMICAL INDUSTRIES CO., LTD
Field: nan (nan)
Classification: CPC nan | IPC C

Claim 5:
6. A method for producing a spherical magnesium oxide, comprising the steps of:
1) Reacting an aqueous magnesium chloride solution with an aqueous alkaline solution to prepare a magnesium hydroxide slurry,
2) Drying and then firing the magnesium hydroxide slurry to prepare magnesium oxide particles,
3) Forming a dispersion of the magnesium oxide particles and wet-grinding the magnesium oxide particles,
4) Spray-drying the wet-ground magnesium oxide, and
5) firing the magnesium oxide granulated by the above step,
wherein, in at least one of the steps 1) to 4), an amount of boron is adjusted so that a content of boron after the firing is 10 to 2,000 ppm and an amount of silicon and phosphorus is adjusted so that a total content of silicon and phosphorus is 300 to 4,000 ppm after the firing.