| 摘要 |
PURPOSE:To separate selectively Sr incorporated in an aq. soln. and to immobilize it by heating an adsorbent in the proper temp. which is obtained by adsorbing and ion-exchanging Sr incorporated in the aq. soln. with TiO2 hydrate and making it a mixture of SrTiO3 and TiO2. CONSTITUTION:Titania hydrate TiO2.mH2O (wherein m=0-3) is obtained by extracting a K2O component from potassium titanate K2O.nTiO2 (wherein n=2-4) with HCl or the like. An Sr adsorbent SrxO-nTiO2.mH2O (wherein x=0.5-1, n=2-8, m=2-8) is obtained by adsorbing and ion-exhanging Sr incorporated in aq. soln. such as a radioactive waste liquid with this TiO2 hydrate. Then a mixture of strontium titanate SrTiO3 and titanium dioxide TiO2 is made by heating the above-mentioned Sr adsorbent at 900-1,300 deg.C and if necessary, it is made to a chemically stable solidified body by pressurizing, molding and sintering the mixture to separate Sr. |
