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AssigneeState Atomic Energy Corporation “Roastom” On Behalf of the Russian Federation
InventorsAndrey Anatolievich Lizin, Sergey Vasilievich Tomilin, Sergey Stepanovich Poglyad
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The invention relates to the field of environmental protection, more specifically to the field of processing radioactive waste, and can he used for the safe and effective handling of a large quantity of liquid radioactive waste of various activity levels that has been formed as the result of decontaminating protective equipment of boxes and chambers, and makes it possible to decrease the volume of stored waste by solidifying same and incorporating same into a ceramic matrix. For this purpose, radioactive solutions after decontamination of surfaces of protective equipment are evaporated as alkaline and acidic solutions containing sodium hydroxide, potassium permanganate, oxalic acid, and nitric acid until a solid residue forms, and are calcined, and the calcinate is mixed with components of a fusion mixture containing oxides of titanium, calcium, iron (III), zirconium, and manganese (IV) and aluminum in a specified ratio, and fused.
A method for handling radioactive solutions after decontamination of the surfaces of protective equipment, the method comprising the combined evaporation of alkaline and acidic solutions containing sodium hydroxide, potassium permanganate, oxalic acid and nitric acid to a solid residue, with subsequent calcination and mixing of the calcinate with the components of the fusion mixture containing oxides of titanium, calcium, iron (III) and aluminum in certain proportions, and the combined melting of all components to produce a ceramic matrix, wherein zirconium and manganese (IV) oxides are further introduced into the mixture of the calcinate and oxides of titanium, calcium, iron (III) and aluminum in the following component proportions, wt %:
Dependencies are inferred from the claim text.