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In this paper, the characteristics and current problems associated with red mud and the progress of research on iron extraction from high-iron red mud are briefly described. By adding conditioning materials to red mud and quenching and tempering, the iron tailings extracted from red mud were reconstructed by heating to form molten tailings in the laboratory. A thermodynamic analysis of the iron reduction reaction during tailings reconstruction was performed, and the best conditions for iron extraction by calcified slag reduction were verified. The contents of CaO, Al2O3 and Na2O in the reduced tailings were 37.07, 37.67 and 0.48%, respectively. According to X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses, the main crystalline phases in the calcified extracted iron tailings were C2AS and CT, which aggregated and met the expected composition standard for calcified extracted iron tailings.

Study on Reductive Smelting of High-Iron Red Mud for Iron Recovery