Method for the preparation of vitreous hollow microspheres

Details Method for the preparation of vitreous hollow microspheres Method for the preparation of vitreous hollow microspheres

1997-03-27

1998-11-10

Chin, Peter

Glass manufacturing

Processes

Self-supporting particle making

65 214, 427212, 427215, 4273722, 501 80, 501 84, 501 85, 106605, C03B 900, C03B 1910, C03B 2300, C03B 3700

Patent

active

058337288

ABSTRACT:
Provided is a method for the efficient preparation of fine hollow spherical glassy bodies having a high strength and excellent whiteness from a volcanic vitreous deposit as the starting material. The fine hollow spherical glassy bodies as desired can be prepared by dispersing 100 parts by weight of a powder of a volcanic vitreous deposit in an aqueous solution containing 1 to 10 parts by weight of aluminum sulfate, adding an aqueous alkaline solution to this liquid suspension to cause deposition of an alumina hydrate onto the surface of the particles of said powder and washing and drying of the solid material followed by a heat treatment for 1 second to 1 minute at a temperature of 900.degree. to 1100.degree. C.

REFERENCES:
patent: 3904377 (1975-09-01), Honda et al.
patent: 3957501 (1976-05-01), Matsuda et al.
patent: 4390456 (1983-06-01), Sanchez et al.
patent: 4543137 (1985-09-01), Edamura et al.
patent: 5017523 (1991-05-01), Kimura et al.
patent: 5614255 (1997-03-01), Kimura et al.

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