ABSTRACT To mitigate composite heavy metal pollution and realize the valorization of industrial solid waste, a geopolymer synthesized from red mud and blast furnace slag was employed for the solidification of composite heavy metals. The solidification effectiveness of the geopolymer under varying conditions of the precursor dosages, heavy metal concentration levels, and curing was evaluated using unconfined compressive strength tests, toxicity leaching assessments, and pH analysis. The stabiliza