METHOD OF LONG-LIVING RADIONUCLIDES FIXATION FOR STORAGE AND TRANSMUTATION Russian patent published in 2009 - IPC G21F9/16 

FIELD: chemistry, waste recycling.

SUBSTANCE: invention relates to field of liquid radioactive wastes recycling. Long-living radionuclides are isolated from nitric acid solution of used nuclear fuel (UNF) into solid phase in form of acetates, oxides and other compounds, which do not contain elements strongly activated with neutrons. Radionuclides are imbedded and fixed in carbon matrix. Carbon matrix is obtained in process of carrying out reaction of metal acetates with excess of phthalonitryl and their further pyrolysis. For radionuclides isolated from UNF in form of oxides or other compounds, carbon matrix is obtained by their mixing with yttrium acetate, then synthesis and pyrolysis of yttrium diphthalocyanine are carried out. Operation of synthesis and pyrolysis of yttrium diphthalocyanine is carried out in inert atmosphere, pyrolysis is carried out at T=850-1100°C. Obtained carbon matrix does not contain elements strongly activated with neutrons, which allows using it both for long-term storage and for transmutation of long-living radionuclides without any chemical processing and additional operations.

EFFECT: obtaining carbon matrix which can be used both for long-term storage and for transmutation of long-living radionuclides without any chemical processing and additional operations.

1 cl, 2 dwg, 3 ex