PROCESS FOR THE EXTRACTION OF ALUMINA FROM ALUMINUM- CONTAINING SILICATES

摘要

PROCESS FOR THE EXTRACTION OF ALUMINA FROM ALUMINUM-CONTAINING SILICATES A process for the extraction of alumina from aluminum-containing silicates is disclosed. The process comprises acid leaching of the raw material, iron extraction, precipitation of the aluminum fraction as the aluminum chloride hexahydrate, removal of sodium chloride and calcination to alumina. The process can be made continuous with substantial regeneration and recycling of process components.