B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
182/123
B01D 39/20 (2006.01) B22C 9/08 (2006.01) C04B 35/80 (2006.01) C04B 38/00 (2006.01) C04B 38/06 (2006.01)
Patent
CA 2022390
A ceramic foam filter, particularly for filtering molton iron, is formed from a composition comprising silicon carbide, alumina, silica derived from colloidal silica sol and alumino-silicate fibres, which has been fixed at such a temperature that the filter has a ceramic matrix in which the alumino-silicate fibres are substantially dissolved. The filter is fired at a minimum temperature of 1150°C and preferably at a temperature within the range from 1200°C to 1300°C. Preferably the filter is formed from an aqueous slurry having a solids content comprising by weight 20 - 50% silicon carbide, 20 - 50% alumina, 1.5 - 5.0% silica derived from colloidal silica sol and 1 - 3% alumino-silicate fibres.
Foseco International Limited
Gowling Lafleur Henderson Llp
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