METHOD OF EXTRACTING URANIUM AND PLUTONIUM Russian patent published in 2016 - IPC G21C19/46 

FIELD: nuclear physics and engineering; processing and recycling of wastes.

SUBSTANCE: method of extracting uranium and plutonium from an aqueous solution involves two successive steps of counterflow treatment of water stream (flow supply) with recycled extractant, as a rule, 30 % solution of tributyl phosphate in an inert diluent. First step is performed in beyond limit mode. Second step is carried out in pre-limit mode (full extraction mode). Extract obtained at second step, without removal from extraction device, is merged with to recycling solvent, supplied to first extraction step, with satisfaction of conditions C_o⋅(V'_o+V''_o)≥1.04⋅C_v⋅V_v, at that V'_o≥V''_o, where C_o is maximum achievable concentration of sum of extracted uranium and plutonium in an organic stream (capacity of extractant), V'_o and V''_o are values of recycled extractant streams of first and second steps respectively; C_v is concentration of sum of extracted uranium and plutonium in water stream and V_v is water flow value.

EFFECT: increased process stability and eliminating constraints on implementation thereof.

2 cl, 2 dwg, 2 tbl