Immobilization of uranium soil by geopolymer coupled with nHAP

Abstract The leaching of uranium in uranium soil will pose great risks to human health and the ecological environment. The immobilization of uranium by coal gangue geopolymers (CGG) and Nano-hydroxyapatite (nHAP)-based composite geopolymers were investigated in this study. The ability of geopolymers to immobilize uranium was evaluated in terms of the static and dynamic leaching concentration. The experimental results confirmed that the lowest static leaching concentration of composite uranium soil solidified body and uranium soil solidified body was 15.94 mg/kg and 21.27 mg/kg after 28 days of immobilization, respectively. During the 28-d dynamic leaching experiment, the highest leaching concentration was 155.38 mg/kg and 166.63 mg/kg, respectively. The composite uranium soil solidified body shows better overall leaching resistance.