Method and device for oxidative adjustment of plutonium valence with NOx

The invention belongs to the technical field of post treatment of nuclear fuels, and discloses a method and device for oxidative adjustment of plutonium valence with NOx. According to the method, NOx and oxygen-containing gas are used as oxidants to destroy a reducing agent in Pu (III) liquid and oxidize Pu (III) into PU (IV); the device comprises a Pu (III) oxidation column and a nitrous acid dispelling column, wherein the upper part of the Pu (III) oxidation column is connected with the nitrous acid dispelling column through a liquid delivery pipe; the device is characterized in that a first exhaust discharge port and a second exhaust discharge port are formed in the top ends of the Pu (III) oxidation column and the nitrous acid dispelling column respectively, and an oxidant inlet and a Pu (III) liquid inlet are formed in the lower part of the Pu (III) oxidation column. The method and the device have the advantages of improving the utilization rate of NOx, stabilizing the pressure in the Pu (III) oxidation column and lightening the treatment burden of nitrogen oxide exhaust.