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摘要
The partitioning phenomena of radioisotope cobalt-60 ((60)Co) and cesium-137 ((137)CS) from a molten ingot, slag, and dust have been investigated for the effect of the slag type, slag concentration and basicity in a plasma arc melting process. A direct current plasma arc furnace was used to melt contaminated stainless steel, and mild steel with an acid, neutral, and basic slag (SiO(2) CaO, Al(2)O(3), Fe(2)O(3), MgO) containing radioactive (60)Co and (137)CS to measure the partitioning phenomena. Calcium oxide and ferric oxide were added to provide an increase in the slag fluidity and oxidative potential, respectively. Most of the (60)Co remained in the ingot phase and was barely present in the slag. (60)Co decontamination factor was not highly dependent on the slag composition. The distribution ratio of (60)Co the ingot and the slag phase showed that about 90% to 95% was recovered in the ingots. (137)CS was completely eliminated from the melt of the stainless steel as well as the carbon steel, and was distributed to the slag and dust phase. The partition remaining in the slag depended on whether the slag was basic or acidic and had a high oxidative flux (Fe(2)O(3)). A maximum of 52% of the (137)CS remained in the slag phase with an acid slag.
- 出版日期2008-7
