METHOD FOR PRODUCING ALUMINA

摘要

The invention relates to metallurgy, particularly to acid methods for producing alumina, and can be used in processing aluminum-containing raw materials, including those of a low-grade. The method for producing alumina comprises treating aluminum-containing raw materials with hydrochloric acid, separating aluminum chloride hexahydrate crystals from the supernatant chloride solution, and thermally decomposing said crystals in two stages to produce alumina. In order to increase the quality of alumina and decrease energy consumption while achieving high process productivity, water vapor is continuously introduced during the second stage of thermal decomposition, with a ratio of the total mass of the introduced water vapor to the mass of produced alumina equal to 0.2-5.7.