Particulate materials

Details Particulate materials Particulate materials

1996-09-18

1999-11-02

Group, Karl

Compositions: ceramic

Ceramic compositions

Pore-forming

501 84, 501141, 501 44, 501128, 501129, 210503, 2105101, C04B 3800, C04B 3300

Patent

active

059770031

ABSTRACT:
A ceramic particulate material which comprises particles having an irregular three dimensional surface profile having jagged projections and a median particle diameter of 200 micrometers or less, the particles being fractals produced by comminution of foamed ceramic material. The material may be such that in a sphere of rotation of the particle, from 30% to 80% of the volume of the sphere is void, the remainder being continuous solid material. The material may be produced by a process which includes providing a suspension of ceramic forming particles e.g., of an aluminosilicate such as clay, in a liquid medium; incorporating a gas in the liquid medium before or after formation of the suspension therein to produce a foamed suspension; extruding the foamed suspension; optionally drying the extrudate formed thereby; calcining the extrudate; and comminuting the calcined material, e.g. by crushing. The material may be used as a substitute for diatomite.

REFERENCES:
patent: 3608060 (1971-09-01), Osment et al.
patent: 4381998 (1983-05-01), Roberts et al.
patent: 5015606 (1991-05-01), Lang et al.
patent: 5418195 (1995-05-01), Kostuch et al.
WPI Abstract Accession No. 94-124619/15 & RU 2002714C1 (Talla B.V.) 41.3192, Nov. 1993.
WPI Acc. No. 87-165762/24 & JP 620096537A (Denki) Oct. 24, 1985.

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