Reduction and melting behavior of carbon composite lateritic bauxite pellets

Semi-Smelting Reduction and Magnetic Separation for the Recovery of Iron and Alumina Slag from Iron Rich Bauxite

“…The alumina slag is mainly composed of gehlenite (Ca2Al2SiO7) and calcium hexaluminate (CaAl12O19), with small amounts of Fe2SiO4, FeAl2O4, manganese oxide (Mn3O4), and metallic iron. These results can be explained by the thermodynamic analysis of Figure 5, beecause the standard free energy changes of Equations (21), (22), and (23) are more negative than that of Equations (19) and (20).…”

“…In addition, DRI is an excellent feedstock for the electric furnaces or basic oxygen furnace, and can be used to produce higher grades of steel [17,18]. Thus, this method is considered to be an effective method for the treatment of complex iron ore and low-grade iron ore resources [19,20]. Chu et al [21] used the coal-based direct reduction and magnetic separation process to recover iron from red mud, the results showed that the iron recovery rate and total iron content in the magnetic product could be up to 98.37% and 82.52%, respectively.…”

“…The reaction equations and the Gibbs free energy that varies with the temperature are calculated using Factsage 7.0, and are presented in Figure 6. It can be seen that the diaspore (AlOOH) and gibbsite (Al(OH) 3 ) are easily decomposed into alumina (Al 2 O 3 ) and water (H 2 O) at low temperatures (Equations (16) and (17) (21), (22), and (23) are predominant at the indicated experimental temperature range, whereas the reactions of Equations (19) and (20) are negative. The standard free energies of Equations (18), (21), (22), and (23) are more negative than that of Equations (19) and (20).…”