FIELD: metallurgy.
SUBSTANCE: melting of metal radioactive waste (MRW) is performed in oxidising atmosphere with oxygen content of 8-10% in liquid oxidised metal bath at content of oxygen in metal of 0.020-0.035%. At that, in order to extract radionuclides from metals and to reliably fix them in slag, oxidised slag of low basicity is used, accumulated deactivated metal is drained from melting chamber, thus leaving 20-30% of all-weld deactivated metal in the chamber. Before the metal is drained, loading of MRW to the melting chamber is stopped for 5-12 minutes and the flow of supplied fuel and oxygen to fuel-oxygen burners is reduced by 2-3 times. Amount of drain metal and drain rate is controlled. After 70-80 % of metal is drained, MRW loading to the melting chamber is renewed and flow of supplied fuel and oxygen to fuel-and-oxygen burners is increased to initial level.
EFFECT: invention allows efficient MRW processing and provides the reduction of evaporation from MRW surface of volatile radionuclides during melting process; reduction of fouling of refractory lining with radioactive slag when metal is being drained from the chamber; excluding the possibility of formation of dioxins during MRW processing.
8 cl, 2 dwg, 1 ex
