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Abstract

Processes are provided for preparing basic aluminum compounds of Formula I: Al.sub.2 (OH).sub.6-a X.sub.a (I) wherein X is Cl.sup.-, Br.sup.-, F.sup.-, I.sup.-, SO.sub.4.sup.= or NO.sub.3.sup.- and a is about 0.9 to 4, the compound being characterized by size exclusion chromatography as having a Band I percent aluminum value of about 5% or less and a Band II percent aluminum value of about 50% to 90%, which comprise (a) suspending an aluminum metal in an aqueous medium to form a slurry, (b) applying ultrasonic energy to the slurry, (c) reacting the sonicated slurry with an aluminum compound of Formula II Al.sub.n X.sub.m (II) or an acid of Formula III: H.sub.n X (III) wherein X is Cl.sup.-, Br.sup.-, F.sup.-, I.sup.-, SO.sub.4.sup.= or NO.sub.3.sup.-, n is 1 or 2 and m is 3, at a temperature of about 45.degree. C. to 100.degree. C. to form a reaction product.

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