PROCESS FOR PRODUCING ALUMINUM OXIDE

摘要

The subject matter of the invention is a process for producing aluminum oxide, characterized by the following steps:
(1) extracting aluminum ions with an organic solvent containing one or more compounds selected from the groups of alkyl phosphoric acids, alkyl and aryl thio phosphoric acids, carboxylic acids and hydroximes together with a petroleum hydrocarbon as a diluent;
(2) preparing aluminum compounds containing fluorine by stripping the aluminum ions contained in the organic solvent of step (1) by contacting the organic solvent 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 aluminum compounds containing fluorine resulting from step (2) in a gas stream containing oxygen or H2O.