Process for preparing basic aluminum carbonate gels substantially free from foreign anions and fibrous colloidal alumina monohydrate of a boehmite crystal lattice structure
OwnerStewart M. Beekmaninventor
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Abstract
A process is provided for preparing basic aluminum carbonate gels substantially free from foreign anions at a pH within the range from about 5.5 to about 7.0, according to the reactants used, and then converting such gels to high purity fibrous colloidal alumina monohydrate of the boehmite crystal lattice structure by hydrolysis with weak acids.
Claims11
A process for preparing basic aluminum carbonate gels that can be washed to an SO.sub.4.sup.= /Al.sub.2 O.sub.3 ratio of less than 0.01 and a sodium Na.sup.+ /Al.sub.2 O.sub.3 ratio of less than 0.01 which comprises reacting in aqueous solution having a pH of about 6.8.+-.0.2 at a temperature within the range from about 10.degree. to about 50.degree. C. sodium aluminate and carbon dioxide, thereby forming a precipitate of basic aluminum carbonate gel, and separating the gel from the reaction medium by filtration.
Dependencies are inferred from the claim text.