Patent ID: 9340432
Filing Date: 2016-05-17
CPC Classification: C01F,C01P,C04B

Claim Text:
1. A method of making spinels comprising: hydrothermally aging an aqueous slurry of a spinel precursor selected from the group consisting of (a) a mixture of boehmite alumina and a magnesium precursor wherein said boehmite alumina is produced by the hydrolysis of an aluminum alkoxide, (b) an aluminum magnesium oxide or hydroxide wherein said aluminum magnesium oxide or hydroxide are produced by cohydrolysis of mixed aluminum-magnesium alkoxides, and (c) mixtures thereof, to produce a hydrothermally aged slurry of a spinel precursor selected from the group consisting of (1) an aged spinel precursor slurry comprising boehmite alumina and magnesium precursor, (2) an aged spinel precursor slurry comprising an aluminum magnesium oxide or hydroxide, and (3) mixtures thereof; drying at least one of said hydrothermally aged slurries to remove water and produce at least one dried spinel precursor; and calcining said at least one of said dried spinel precursor to produce magnesium aluminate spinel.