CO-PRODUCTION OF CHEMICAL GRADE AND METAL GRADE ALUMINIUM-HYDROXIDES

Altrichter, M., Solymar, K., Baksa, G, Balogh, Z. and Vallo, F.

Besides metal grade alumina, one of the main goals of existing alumina plants (especially old and small ones) is to produce added value, specialty alumina-based chemicals. Production of pure and white aluminium hydroxides requires special liquor purification and precipitation processes. The economic feasibility of manufacturing these specialty hydrates depends on the proper combination of metal and chemical grade hydrate precipitation process stages.

Pure and white aluminium hydroxide products have been developed by Aluterv-FKI Ltd. and Ajka Aluminium Ltd. to widen the products list of Hungalu and improve the competitiveness of the Ajka Alumina Plant.