A new technology for coprocessing man-made wastes

The possibility of the selective separation of components of starting materials with concentrations of Fe, P, and Ga in cast iron and Al₂O₃, TiO₂, and Sc₂O₃ in slag suitable for cement production is established based on the results of reduction smeltings of cakes after leaching the mixtures of greasy mill scale (GMS) with 75 and 100% red mud (RM) and fired pellets made of these cakes. It is shown that, depending on how long the melts were held (20–60 min at 1620°C), the components are transferred into cast iron: 98 Fe, 22–66 Si, 1 S, 99 P, 11–20 Ti, and 98–99% Ga. Components that are concentrated in slag are 95–99 Al₂O₃, 55–65 SiO₂, 88–90 TiO₂, and 98–99% Sc₂O₃. A flowchart of the joint utilization of GMS and RM is developed.