METHOD FOR REMOVING TRANSITION METALS AND RADIONUCLIDES FROM SOLUTIONS CONTAINING COMPLEXING AGENT Russian patent published in 2012 - IPC G21F9/00 

FIELD: power industry.

SUBSTANCE: method for removing transition metals and radionuclides from solutions containing complexing agent including circulation of cleaned solution through anionite, converted to shape of complexing agent, with simultaneous recovery of that agent and with its further return to the main volume of cleaned solution at maintaining optimum ranges of pH and temperature values of cleaned solution. Hydroxyethylidenediphosphonic acid is used as complexing agent. Volume distribution coefficients of trace contaminants of ions of transition metals and radionuclides between cleaned solution and anionite in the form of complexing agent and dependences of volume distribution coefficients on equilibrium pH values of cleaned solutions are determined; at that, optimum ranges of pH values of solutions are determined from dependences of volume distribution coefficients of ions of metals and radionuclides on anionite in the form of complexing agent on equilibrium pH values of cleaned solutions and maintained during cleaning in the range corresponding to maximum values of volume distribution coefficients of trace contaminants of ions of transition metals and radionuclides between cleaned solution and anionite, and temperature of solution on anionite is maintained in upper limits corresponding to rated values of anionite as to thermal stability.

EFFECT: invention allows improving sorption efficiency, enlarging the capacity of sorbents in the form of complexing agents as to metals.

3 cl, 10 tbl