METHOD TO SEPARATE URANIUM AND PLUTONIUM IN EXTRACTION TECHNOLOGY OF SPENT NUCLEAR FUEL RECYCLING Russian patent published in 2012 - IPC G21F9/28 

FIELD: power engineering.

SUBSTANCE: method includes a counterflow treatment of a uranium-plutonium extract with an aqueous solution of a reducing agent that recovers plutonium to low-extractable state Pu (III), carried out in two subsequent stages. The first of them is carried out at the ratio of organic and water phase flows, O:W, from 25 to 50, and an aqueous plutonium containing solution produced as a result is taken out from the extraction cycle, and the second one is carried out at O:W from 7 to 15, in the solution produced accordingly the excessive reducing agent is destroyed, and Pu (III) is oxidizer to Pu (IV), afterwards the solution is returned to the extraction cycle into the area that precedes the first stage of separation.

EFFECT: higher content of plutonium in the flow taken from the extraction cycle to further recycling, and reduced content of plutonium in the uranium product.

5 cl, 4 tbl, 2 dwg