Experimental Study on the Directional and Graded Conversion of Ferrous Oxalate and Ferric Hydroxide from Red Mud

Abstract Red mud is a highly alkaline industrial solid waste generated by the alumina industry. Its stacking and disposal not only occupy land resources, but also cause environmental pollution. It is of great significance to separate and purify target compounds from complex mixtures of red mud based on their resource utilization properties. Ferrous oxalate and ferric hydroxide were prepared by oriented conversion based on redox reaction and chemical precipitation in this research. The products prepared were characterized by XRD, SEM and IR under different conditions (iron powder, ascorbic acid and photocatalysis). The results show that the two-stage acid leaching process can improve the leaching rate of iron from red mud significantly, and the experimental of oriented conversion of ferrous oxalate and ferric hydroxide from red mud with reproducibility. The sample prepared with ascorbic acid as reducing agent has the best effect. The development of this experiment provides a new idea for the directional classification and purification of ferrous oxalate and iron hydroxide from red mud.