Immobilization of cesium into pollucite structure by hydrothermal hot-pressing.
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概要
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In order to immobilize Cs into pollucite structure, hydrothermal reactions of Cs with amorphous aluminosilicate (siliceous sinter) and with mixtures of low-quartz (silicastone) and Al(OH)<SUB>3</SUB>, were performed. In both cases, pollucite was formed in 5-N NaOH solution above 200°C for 10 min. Synthesized pollucite was solid solution between pollucite and analcite. Waste forms in which Cs was immobilized in pollucite structure were successfully produced by the hydrothermal hot-pressing method using the silica matrix (mixture of low-quartz and amorphous aluminosilicate) containing Al(OH)<SUB>3</SUB> and NaAlO<SUB>2</SUB>. Effect of hot-pressing conditions on leachability of the waste forms was investigated. The waste form containing 10 ?? CsOH produced at 300°C and 49 MPa for 24 h, had Cs leach rate of 3.15 g/m<SUP>2</SUP>•d by Soxhlet leach tests for 7 d. The waste form was porous, but had high compressive strength and thermal stability.
- 一般社団法人 日本原子力学会の論文
著者
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Yanagisawa Kazumichi
Research Laboratory Of Hydrothermal Chemistry Faculty Of Science Kochi University
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Yamasaki Nakamichi
Research Laboratory Of Hydrothermal Chemistry Faculty Of Science Kochi University
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NISHIOKA Mamoru
Research Laboratory of Hydrothermal Chemistry, Faculty of Science, Kochi University
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