Alternatives for High-Level Waste Salt Processing at the Savannah River Site (2000) / Chapter Skim
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Caustic Side Solvent-Extraction Process
Caustic Side Solvent-Extraction Process
Pages 65-71
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From page 65... ...
The stripped organic solvent can then be recycled, and the target components can be treated by whatever process is appropriate. In this fashion a process can be designed to allow continuous extraction of the target components from an input stream and produce an output stream called the raffinate that is nearly free of the target components.
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From page 66... ...
| sludge | \ ad ~;~\~ solvent | strontium- and | extraction it' \ extract O · ~ · · strontium · cesium O actinides | DWPF I I Glass I cesium salts solvent jet stripping / | recovered I | solvent | | Saltstone | FIGURE 6.1 Schematic flow sheet for radionuclide removal from high-level tank waste at Savannah River using caustic side solvent extraction.
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From page 67... ...
This experience includes exposing various organic solvents to high-radiation fields without experiencing catastrophic degradation rates. Previous experience has been mainly with aqueous feed streams that are acidic, and the key to all solvent extraction operations usually centers on the selective transfer of specific nuclides into the organic solvent.
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From page 68... ...
The calixarene crown ether appears to work through a combination of effects to generate a cavity that preferably incorporates cesium relative to other ions. The general structure shown in Figure 6.2 shows that there are two cavities, each of which is clefined by a polyether macrocyclic ring containing six oxygen atoms capable of solvating the included ion.
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From page 69... ...
Caustic Side Solvent-Extraction Process Cs O 1 o \ ~ v_ O) i` -two 69 o ' O ,0 / FIGURE 7.2 The calixarene crown ether (BobCalixC6)
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From page 70... ...
. Will various ions from the tank waste or other materials in the feed stream tend to build up in the solvent phase and reduce separation efficiency or reduce the carrying capacity of the calixarene crown ether for cesium?
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From page 71... ...
2) Design of a hot laboratory demonstration process- using real tank waste—on a scale sufficient to define the final process should begin immediately.
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