Process for converting hydragillite into boehmite

Details Process for converting hydragillite into boehmite Process for converting hydragillite into boehmite

1983-05-09

1985-08-13

Carter, H. T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423631, C01F 702

Patent

active

045349576

ABSTRACT:
Hydrargillite is converted into boehmite by preparing a suspension (A) of hydrargillite in water with a proportion from 150 g/l to 700 g/l of dry material expressed as Al.sub.2 O.sub.3, subjecting it to heat treatment under pressure (D) at a temperature of from 200.degree. C. to 270.degree. C., the speed of the rise in temperature of said suspension being at least 1.degree. C./minute, and causing it to pass a period of time of from 1 minute to 60 minutes in a holding zone (D) at a temperature in the range of from 200.degree. C. to 270.degree. C.
The boehmite produced has a granulometry which is at most identical to that of the initial hydrargillite, and has a much lower content of alkaline material.

REFERENCES:
patent: 1953201 (1934-04-01), Toslund
patent: 2656250 (1953-10-01), Thibon et al.
patent: 2659660 (1953-11-01), Sable
patent: 3954957 (1976-05-01), Koenig
patent: 4117105 (1978-09-01), Heitzenberg et al.
patent: 4224302 (1980-09-01), Ukamoto et al.

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