System for disposing of radioactive waste
Conversion of radioactive waste materials into solid form
Rhodium recovery process Patent #: 4363765
ApplicationNo. 06/389402 filed on 06/17/1982
US Classes:423/181, Ion exchanging or liquid-liquid extracting210/643, Utilizing liquid membrane (e.g., emulsion) in liquid/liquid solvent or colloidal extraction210/650, Filtering through membrane (e.g., ultrafiltration)210/651, Removing specified material252/634In form of sol solution or gel
ExaminersPrimary: Hunt, Brooks H.
Assistant: Locker, Howard J.
International ClassG21F 9/00 (20060101)
AbstractA process of recovering cesium ions from mixtures of ions containing them and other ions, e.g., a solution of nuclear waste materials, which comprises establishing a separate source phase containing such a mixture of ions, establishing a separate recipient phase, establishing a liquid membrane phase in interfacial contact with said source and recipient phases, said membrane phase containing a ligand, preferably a selected calixarene as depicted in the drawing, maintaining said interfacial contact for a period of time long enough to transport by said ligand a substantial portion of the cesium ion from the source phase to the recipient phase, and recovering the cesium ion from the recipient phase. The separation of the source and recipient phases may be by the membrane phase only, e.g., where these aqueous phases are emulsified as dispersed phases in a continuous membrane phase, or may include a physical barrier as well, e.g., an open-top outer container with an inner open-ended container of smaller cross-section mounted in the outer container with its open bottom end spaced from and above the closed bottom of the outer container so that the membrane phase may fill the outer container to a level above the bottom of the inner container and have floating on its upper surface a source phase and a recipient phase separated by the wall of the inner container as a physical barrier. A preferred solvent for the ligand is a mixture of methylene chloride and carbon tetrachloride.