Security Disposal and Comprehensive Utilization of Bauxite Residues

Abstract

Security disposal and comprehensive utilization of bauxite residues are of great significance to the world alumina industry due to environmental protection requirement and waste materials recovery. The security disposal and utilization technologies for bauxite residue will be shown and discussed in this paper. The dry stacking technology for Bayer residues by the drum or pressure filters has been applied widely in the Chinese refineries from 10 years ago. Magnetic separation dressing of high iron content red mud for iron ore concentrates has been put into industrial operations in China for more than 5 years. The residue from sintering process is able to be used for red mud pool dam construction and Soil Modifiers for high acidic soil areas for neutralizing and adsorbing the harmful heavy metal compounds in the soil. The high caustic Bayer residues could be applied for such construction materials as foamed ceramics and glass ceramics etc. The further utilization possibilities and potentials in the future are outlined in the steelmaking, construction, agriculture and environmental industry etc.