Technology for Cement Accelerator Utilization Based on Fe-Al Sludge from Waste Battery Recycling

Fe-Al sludge generated during waste battery recycling processes is a metal-rich industrial by-product that has recently drawn attention as a promising material for resource circulation and functional construction applications.This review paper comprehensively summarizes recent research trends on the development of fundamental technologies and the practical applicability of utilizing Fe-Al sludge as a cement accelerator.The analysis revealed that Fe-Al composite sludge promotes the formation of ettringite and hydroxysulfate-type hydration products through interactions between metal ions, effectively contributing to the reduction of setting time and the early development of strength in cement paste.Compared to conventional chloride-based accelerators, it offers advantages in terms of durability and environmental stability, and is expected to serve as a strategic turning point that enhances both the eco-friendliness and economic feasibility of the construction materials industry.