Calcination processes for preparing various types of alumina
AssigneeOrbite Technologies Inc.
InventorsEbrahim ALIZADEH, Hubert DUMONT, Jonathan BOUFFARD
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Abstract
There are provided processes for converting alumina into α-Al2O3 or transition alumina that comprise heating the alumina at a temperature of about 900° C. to about 1200° C. in the presence of steam and optionally at least one gas under conditions suitable to obtain the α-Al2O3 or transition alumina. For example, the alumina can comprise a transition alumina (such as γ-Al2O3), an amorphous alumina or a mixture thereof.
Claims220
A process for converting alumina into α-Al2O3 or transition alumina, said process comprising heating said alumina at a temperature of about 950° C. to about 1150° C. in the presence of steam and optionally at least one gas chosen from air, argon, nitrogen, carbon dioxide, hydrogen and hydrochloric acid, under conditions suitable to obtain said α-Al2O3 or transition alumina.
A process for converting a first type of alumina into a second type of alumina, said process comprising heating said first type of alumina at a temperature of about 900° C. to about 1200° C. in the presence of steam and optionally at least one gas, under conditions suitable to obtain said second type alumina.
A process for treating alumina, the process comprising heating said alumina at a temperature of about 900° C. to about 1200° C. in the presence of steam and optionally at least one gas.
A process for converting AlCl3.6H2O into alumina, said process comprising heating AlCl3.6H2O at a temperature of about 900° C. to about 1200° C. in the presence of steam and optionally at least one gas, under conditions suitable to obtain the alumina.
Dependencies are inferred from the claim text.