超臨界二氧化碳對放射性污染金屬除污研究
| Autor: | Kou-Min Lin, 林國明 |
|---|---|
| Rok vydání: | 2002 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 90 This research is a feasibility study on the decontamination of metal contaminant from the surface of a stainless steel using supercritical carbon dioxide fluid. The metal contaminants include transition metals such as Mn, Co, Ni, and Cu, as well as alkaline-earth metals such as Mg and Ca. In the case of adding high efficiency reagent, which is a mixture of HFA, TBP and CH3OH, the metal removal ratio is in the range of 94 - 100%. In the solution, the metal ions are associated with two HFA molecules and one TBP molecule to form a complex. It’s also found that the metal removal ratio is higher under the supercritical condition than that of under the normal condition. After all, the feasibility of using supercritical carbon dioxide fluid as a decontamination reagent is practical. From the result of only 29% removal efficiency to Fe+3 element in the supercritical fluid with the addition of HFA, TBP and CH3OH reagents. it shows that the recipe of reagent is important. In order to evaluate the efficiency of a new recipe, which is environmentally friendly and economic, a parameter of reagent solubility in supercritical fluid can be calculated for judgement. The less of the value of solubility indicates the better of dissolution of metal complex in supercritical fluid. With the aid of experimental work, a commercial adding reagent will come true.The experimental results show that a practical a reagent which is consisted with AcAc, TBP and CH3OH has a good decontamination efficiency for metal ions such as Mg, Ca, Mn, Co, Ni and Zn. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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