Magnesia granule coated with silica or forsterite

Details Magnesia granule coated with silica or forsterite Magnesia granule coated with silica or forsterite

1988-06-02

1990-12-11

Lesmes, George F.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

427215, B32B 1800

Patent

active

049770241

ABSTRACT:
A magnesia granule having a surface covered with a continuous and uniform coating of silica or forsterite, and suitable for use as a filler. The magnesia granule is prepared by a process comprising granulating a magnesia powder into a spherical shape, heat treating the granular particles at a temperature in a range of from 1400.degree. C. to 1700.degree. C. for not more than 1 hour, and then subjecting the particles to gas-solid phase mixing with a heated vapor of an organic silicate compound in a fluidized bed reactor to cover the surface of the granular magnesia particles with a continuous and uniform coating of silica, or a process comprising granulating a magnesia powder of particles coated with a silica layer into a spherical shape, and then heat treating the granular particles at a temperature in a range of from 1400.degree. C. to 1700.degree. C. for not more than 1 hour to cover the surface of the granular particles with a continuous and uniform coating or forsterite.

REFERENCES:
patent: 4677026 (1987-06-01), Hamamoto et al.
patent: 4766162 (1988-08-01), Hamamoto et al.
patent: 4781982 (1988-11-01), Musselman et al.
patent: 4789510 (1988-12-01), Toda

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