| 摘要 |
A method for converting UOand/or UOinto hydrated UOhaving the formula UO∙nHO, where n is 2 or 4, including the following consecutive steps: a) preparing an aqueous suspension of a UOpowder and/or a UOpowder; b) adding hydrogen peroxide HOto the aqueous suspension of UOand/or UOpowder, converting the UOand/or UOinto hydrated UOand precipitating, crystallizing the hydrated UOin the suspension; c) recovering the precipitate crystals of UOhydrate; d) optionally, washing the recovered precipitate crystals of UOhydrate; e) optionally, repeating step d); f) optionally, drying the precipitate crystals; wherein the addition of HOto the aqueous suspension is carried out so that the suspension contains a stoichiometric excess of HOwith respect to the stoichiometry of the reaction from UO: UO+nHO+HO→UO∙nHO+HO (1), or of the reaction from UO: UO+1.33HO+nHO→UO∙nHO+HO (2), and the pH of the suspension is maintained in steps a) and b) at a value between 2 and 4. |
