Abstract
The disposal of spent radioactive ion exchange resin generated during the operation of nuclear facilities has always been a conundrum. The molten salt oxidation (MSO) for the treatment of mixed resin (MR) shows obvious superiority. In this work, ternary carbonate (Li2CO3-Na2CO3-K2CO3) and MR was used as the molten salt system and the oxidation target, respectively. The oxidation behavior of MR was analyzed by varying the temperature and oxygen equivalent during the MSO process. By studying the effect of different oxygen equivalents on the oxidation efficiency, the oxygen equivalent of 125% could make the oxidation efficiency of MR reach 99.99% at 800 °C. The composition of C, N and S containing exhaust gas produced through MSO process of MR with temperature were almost consistent with the simulation results. The exhaust gas was successfully adsorbed by molten carbonate to produce nitrate and sulfur compounds. The carbonate has good absorption to harmful gases such as SO2, CO, NO, etc. The content of SO2 from the highest 0.32% to 0, and 71.23% of sulfur in MR was trapped by molten carbonate as the form of sulfate. This work has important implications for reducing the potential harm of radioactive waste resin to the environment.
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