Patent Number: 
Section: claims

1. A method of recovering uranium (U) using a process for treating a washing wastewater comprising hydrogen peroxide (H2O2), sodium carbonate (Na2CO3), and a uranium complex, the washing wastewater released during a washing process of a uranium hexafluoride (UF6) cylinder, the method comprising:(1) adding sodium hydroxide (NaOH) to the washing wastewater to precipitate the uranium complex, contained in the washing wastewater, in a sodium diuranate (NaDU) form;(2) separating a sodium diuranate (NaDU) precipitate formed during the step (1) and the washing wastewater using filtration;(3) evaporating the washing wastewater filtered during the step (2); and(4) cooling a vapor generated during the step (3) to recover a condensate and then checking remaining amounts of uranium (U) and fluorine (F). 2. The method of claim 1, wherein a demineralized water or a mixed solution, including the hydrogen peroxide (H2O2) and the sodium carbonate-(Na2CO3), is used as a washing solution during the washing process of the uranium hexafluoride (UF6) cylinder, causing generation of the washing wastewater. 3. The method of claim 1, further comprising:after the step (3),(5) filtering and evaporating a remaining wastewater after the evaporating of the step (3); and(6) cooling a vapor generated during the step (5) to recover a condensate and then checking remaining amounts of uranium (U) and fluorine (F). 4. The method of claim 1, wherein a sodium hydroxide (NaOH) aqueous solution is added while the washing wastewater is heated during the step (1) so that a pH is controlled to form a sodium diuranate (NaDU) solid, thereby performing precipitation. 5. The method of claim 1, wherein during the step (3), a steam is supplied to evaporate water, the evaporated water is transported through a heat exchanger to a condensate storage tank, and a residue is returned to the step (2).