Producing alpha alumina particles with pressurized acidic steam

Details Producing alpha alumina particles with pressurized acidic steam Producing alpha alumina particles with pressurized acidic steam

1988-02-08

1989-04-18

Stoll, Robert L.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423624, 423625, 423626, 423628, 423111, 501153, C01F 702

Patent

active

048225924

ABSTRACT:
Alumina particles having average particle size of about 1-20 microns are converted to alpha alumina in a steam-fluidized bed maintained at about 380.degree.-600.degree. C. and a pressure greater than about 1000 psig. Acidifying the steam reduces average crystallite size of the product and lowers content of some impurities. A preferred product is alpha alumina having an average crystallite size of less than about 0.2 micron.

REFERENCES:
patent: 2642337 (1953-06-01), Newsome
patent: 4019914 (1977-04-01), Esper et al.
patent: 4477427 (1984-10-01), Matyasi et al.
The Condensed Chemical Dictionary, Eigth Ed. Van Nostrand Reinhold Company NY p. 246, 1971.

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