1999 年 115 巻 8 号 p. 611-617
A recovery method of iron component as metallic phase from bauxite residue (red mud) discharged from Bayer process was examined. Tablets prepared with fine mixtures of red mud and carbonaceous materials were heated up to various temperatures to reduce iron oxides in the red mud. The effect of CaCO3 addition was also examined to promote the coalescence/cohesion of formed metallic iron grains. The reduced samples were crushed and then subjected to sieving for the separation of metallic iron bearing particles. When CaCO3 was added, iron yield of more than 90 mass % was attained in the upper size fraction. It was due to formation of large metallic iron particles having size greater than 0.3 mm.
