Abstract: | On the Chemistry of Bauxite Extraction. II. Studies in the System Na2O? CaO? Al2O3? TiO2? H2O between 100 and 275°C The formation of crystalline compounds in the system Na2O? CaO? Al2O3? TiO2? H2O was studied between 100 and 275°C. With caustic alkali concentrations up to 300 g Na2O/l the calcium aluminate 3 CaO · Al2O3 · 6 H2O is formed. With rising temperatures two different calcium titanates, among them perovskite, CaTiO3, are identified. Above 200°C perovskite is formed at all concentrations investigated. |