A self-synthesized novel composite alkaline slow-release material was studied for the treatment of uranium mine acid mine drainage (AMD) containing high concentrations of . Static tests were first conducted to screen for an optimal composite alkali-releasing material. Subsequently, static condition tests and dynamic column experiments were carried out to evaluate the alkali-release performance, physical stability, and the removal efficiency of U(Ⅵ) and Mn from simulated AMD. The results show that for an acidic solution with pH 2.6 and mass concentration of 2.7 g/L, the optimal composite alkali-releasing material exhibits good resistance to pulverization and sustained alkali-release performance. In the dynamic column experiment, when the material contacted the solution for 40 minutes, the effluent pH can be stably raised to 8－9. With initial mass concentrations of U and Mn at 1 mg/L and 2.9 mg/L, respectively, the removal rates of U and Mn are 69.8% and 67.2%, respectively. The material demonstrates long-term resistance to pulverization under the erosion of high-concentration acid, making it suitable for use as a slow-release alkali source in Permeable reactive barrier (PRB) technology.

Acid mine drainage (AMD)  /  alkaline slow-release material  /  sulfate  /  uranium mine  /  Permeable reactive barrier (PRB)