Cheng et al. (2026): Comparative Study on the Enhancing Effects of CaSO₄ and CaCl₂ Supplementation on Red Mud Carbonation
Yu Cheng, Shiying Yan, Lu Jin, Xu Wang, Ming Jia, Ping An and Binghui Sun, IN: Frontiers in Climate, https://doi.org/10.3389/fclim.2026.1732612
Red mud (RM), a strongly alkaline solid waste generated during alumina production, can undergo carbonation with CO₂ for mineral sequestration. To investigate the promoting effect of external calcium sources on RM carbonation, desulfurization gypsum (CaSO₄) and calcium chloride (CaCl₂) were selected as supplements, and RM samples with/without these calcium sources were prepared. Experiments were conducted under various CO₂ concentrations (100%, 15%, 1%) and atmospheric conditions for both RM suspensions and solid-state RM (simulating open-air piles).