THE UNIVERSAL SOLVENT EXTRACTION (UNEX) PROCESS. II. FLOWSHEET DEVELOPMENT AND DEMONSTRATION OF THE UNEX PROCESS FOR THE SEPARATION OF CESIUM, STRONTIUM, AND ACTINIDES FROM ACTUAL ACIDIC RADIOACTIVE WASTE

Autor:	Igor V. Smirnov, Vasily Babain, V. M. Esimantovskiy, B. N. Zaitsev, Jack D. Law, R. Scott Herbst, Terry A. Todd, V. N. Romanovskiy
Rok vydání:	2001
Předmět:	Strontium Chemistry General Chemical Engineering Extraction (chemistry) Radiochemistry Radioactive waste chemistry.chemical_element General Chemistry Actinide Diluent Solvent Radium Caesium Nuclear chemistry
Zdroj:	Solvent Extraction and Ion Exchange. 19:23-36
ISSN:	1532-2262 0736-6299
Popis:	A novel solvent extraction process, the Universal Extraction (UNEX) process, has been developed for the simultaneous separation of cesium, strontium, and the actinides from acidic waste solutions. The UNEX process solvent consists of chlorinated cobalt dicarbollide for the extraction of 137Cs, polyethylene glycol for the extraction of 90Sr, and diphenyl-N,N-dibutylcarbamoyl phosphine oxide for the extraction of the actinides and lanthanides. A nonnitroaromatic polar diluent consisting of phenyltrifluoromethyl sulfone has been developed for this process. A UNEX flowsheet consisting of a single solvent extraction cycle has been developed as a part of a collaborative effort between the Khlopin Radium Institute (KRI) and the Idaho National Engineering and Environmental Laboratory (INEEL). This flowsheet has been demonstrated with actual acidic radioactive tank waste at the INEEL using 24 stages of 2-cm diameter centrifugal contactors installed in a shielded cell facility. The activities of 137Cs, 90Sr, and th...
Databáze:	OpenAIRE
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