<報文>水酸化ルテニウムを含むアルミノケイ酸ゲルおよびジルコニア-シリカ系ゲルの焼成処理

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Processing of ruthenium with aluminosilicate and ZrO_2-SiO_2 gels has been studied in order to convert the high level liquid waste and the scrubber liquid waste into the solidified products. Thermal transformations of gels containing ruthenium oxide were examined by means of differential thermal analysis, thermogravimetric analysis and X-ray powder diffraction. Ruthenium hydroxide was converted into ruthenium oxide by calcination above 300℃. Aluminosilicate gels containing ruthenium hydroxide were converted into RuO_2-mullite at 1,000℃ for 3hr. Zirconia-silica gels containing ruthenium hydroxide were converted into RuO_2-ZrO_2(tetragonal)-SiO_2(amorphous) at 1,000℃ for 3hr. Solidified RuO_2-mullite and RuO_2-ZrO_2(tetragonal)-SiO_2(amorphous) show no thermal transformation under 800℃, therefore, these calcined materials gain resistance to large heat evolution from the high level solid wastes.
1984-09-25