<報文>アルミノケイ酸ゲルおよびジルコニア-シリカ系ゲルによる塩化物溶液からのルテニウムの共沈

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Coprecipitation of ruthenium with complex oxide gels was studied in connection with the removal of radioactive ruthenium in high-level radioactive waste solution. Aluminosilicate gel used as a precipitant was prepared by the addition of aqueous hydrochloric acid to a sodium aluminate-sodium silicate solution containing ruthenium chloride. Under the conditions of aluminate >4×10^<-2>M, Al/Si>0.5,and pH 5〜8.5,the rates of coprecipitation of ruthenium were found to be over 96%. Zirconia-silica gel was obtained by mixing the aqueous sodium hydroxide solution and the zircony chloride-sodium silicate solution containing ruthenium chloride. The rates of coprecipitation of ruthenium exceeded 95%, when zirconyl >6.1×10^<-2>M, Zr/Si>0.5,and PH>5.
1980-03-06