Method of manufacturing silica powder with spherical grains

Details Method of manufacturing silica powder with spherical grains Method of manufacturing silica powder with spherical grains

1996-04-09

1998-02-24

Fiorilla, Christopher A.

Plastic and nonmetallic article shaping or treating: processes

Spheroidizing or rounding of solid particles

B22D 1101

Patent

active

057209090

ABSTRACT:
A method for producing spherical silica grains using a cylinder having its axis inclined to the horizontal and having an inside wall made from a material that is significantly softer than silica. The cylinder has an entry chute for non-spherical silica grains and an exit chute for spherical cylinder grains. According to the method, a rotary member is rotated at high speed by a drive shaft having its axis coincident with the axis of the cylinder. The rotary member includes at least one paddle vertically aligned with the entry chute so that silica grains entering via the entry chute are thrown by the paddle against the inside wall of the cylinder and follow a path most of which is against the wall before leaving via the exit chute. As a result, the silica graining have a spherical shape.

REFERENCES:
patent: 3146281 (1964-08-01), Krystyniak et al.
patent: 3227783 (1966-01-01), Williams
patent: 4592707 (1986-06-01), Borer et al.
patent: 4840755 (1989-06-01), Nakazawa et al.
patent: 5112612 (1992-05-01), Garvey et al.
Patent Abstracts of Japan, vol. 12, No. 84 (C-482) 17 Mar. 1988 corresponding to JP-A-62 221434 (Nara Yorioki et al) dated Sep. 29, 1987.

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