Patent ID: 11891307
Assignee: JGC CATALYSTS AND CHEMICALS LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  B  H | IPC C  H

Claim 13:
14. The method of producing the silica-based particle group including the irregularly shaped silica-based particles and the non-irregularly shaped silica-based particles according to claim 12,
wherein in the step a, the porous silica-based gel is subjected to the wet crushing in the alkaline state of pH 8.0 to 11.5 to obtain the solution containing the irregularly shaped porous silica-based gel-including particles;
wherein in the step b, the solution containing the irregularly shaped porous silica-based gel-including particles is adjusted to an SiO2 concentration of 1 to 10 mass % and heated to a temperature of 60° C. to 170° C., the silicic acid solution is continuously or intermittently added in the alkaline state of pH 9 to 12.5 to fill the pores between the primary particles in the irregularly shaped porous silica-based gel-including particles by the reaction with the silicic acid to reduce the specific surface area of the particles, while causing the particles to grow with their shape remaining irregular; and
wherein in the step c, the solution containing the irregularly shaped silica-based particles having grown is concentrated and the silica-based particle group including the irregularly shaped silica-based particles is collected.