Uranium in industrial water is usually found in the environment in the quadrivalent uranium [U(IV)] and hexavalent uranium [U(VI)] forms, which coexist with other metal compounds or oxides. Uranium(IV) could be removed in the form of precipitation because it easily forms stable complex-shaped precipitation. Uranium(VI) usually exists in the form of uranium dioxide (UO22+), which has good solubility and is difficult to remove. Therefore, the removal of uranium from wastewater generally refers to the removal of U(VI) and its compounds.