METHOD OF CLEANING STILL RESIDUES OF LIQUID RADIOACTIVE WASTES FROM RADIOACTIVE COBALT AND CAESIUM Russian patent published in 2012 - IPC G21F9/30 

FIELD: physics, nuclear.

SUBSTANCE: invention relates to nuclear power and particularly issues of handling liquid radioactive wastes. The method of cleaning still residues of liquid radioactive wastes from radioactive cobalt and caesium by oxidising the still residue and extracting activated corrosion products by filtering, characterised by that hydrogen peroxide is added to the still residue and repeatedly passed in circulation mode through a tubular reactor, while exposing the still residue to hard UV radiation; the process is carried out at solution pH 7-10 and temperature 45-98°C; after separating the sludge by microfiltration, said sludge containing radioactive cobalt, iron and manganese, solutions of diethyldithiocarbamates of alkali metals and transition metal salts are simultaneously added to the filtrate at the same pH and temperature values, followed by separation by microfiltration of the formed precipitate of diethyldithiocarbamates of transition metals with radioactive cobalt; and radioactive caesium is extracted on ion-selective sorbents in steps using a counterflow method with removal of spent sorbents by microfiltration together with cobalt diethyldithiocarbamate.

EFFECT: invention enables to avoid use of an ozonator station, makes the process safer and considerably increases efficiency of processing liquid radioactive wastes.

5 cl, 3 ex, 4 tbl