PROCESS FOR RECOVERY OF ALUMINUM OXIDE FROM ALUMINUM COMPOUNDS CONTAINING FLUORINE

摘要

A process for the production of aluminum oxide from aluminum compounds containing fluorine comprises the steps of (1) extracting aluminum ions with an organic solvent containing one or more compounds selected from the groups of alkyl phosphoric acid, alkyl and aryl thio phosphoric acid, carboxylic acid and hydroxime together with a petroleum hydrocarbon as a diluent; (2) preparing aluminum compounds containing fluorine by stripping the aluminum ions in the resultant organic solvent from the step (1) in contact with an aqueous solution containing one or more compounds selected from the groups of HF, NH4HF2, NH4F or KHF2 and simultaneously regenerating the organic solvent, and (3) producing aluminum oxide by heating the resultant aluminum compounds containing fluorine from the step (2) in gas stream containing oxygen or H2O.