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Proof-of-concept flowsheet tests for caustic-side solvent extraction of cesium from tank waste.

DE2001779797

Publication Date	2001
Personal Author	Leonard, R. A.; Aase, S. B.; Arafat, H. A.; Conner, C.; Falkenberg, J. R.; Vandegrift, G. F.
Page Count	21
Abstract	A caustic-side solvent extraction (CSSX) process to remove cesium from Savannah River Site (SRS) high-level waste was tested in a minicontactor (2-cm centrifugal contactor). In the first phase of this effort, the minicontactor stage efficiency was improved from 60% to greater than 80% to meet the SRS process requirements using a 32-stage CSSX flowsheet. Then, the CSSX flowsheet was demonstrated in a 32-stage unit, first without solvent recycle, then with it. In both cases, the key process goals were achieved: (1) the cesium was removed from the waste with decontamination factors greater than 40,000 and (2) the recovered cesium was concentrated by a factor of 15 in dilute nitric acid. Oak Ridge National Laboratory (ORNL) analysis of the recycled solvent showed no evidence of impurity buildup.
Keywords	Cesium Solvent extraction Radioactive waste processing High-level radioactive wastes Flowsheets Nitric acid Solvents Savannah river plant
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Argonne National Lab., IL.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200125
Contract Number	W-31-109-ENG-38

Proof-of-concept flowsheet tests for caustic-side solvent extraction of cesium from tank waste.

Proof-of-concept flowsheet tests for caustic-side solvent extraction of cesium from tank waste.
DE2001779797

Publication Date	2001
Personal Author	Leonard, R. A.; Aase, S. B.; Arafat, H. A.; Conner, C.; Falkenberg, J. R.; Vandegrift, G. F.
Page Count	21
Abstract	A caustic-side solvent extraction (CSSX) process to remove cesium from Savannah River Site (SRS) high-level waste was tested in a minicontactor (2-cm centrifugal contactor). In the first phase of this effort, the minicontactor stage efficiency was improved from 60% to greater than 80% to meet the SRS process requirements using a 32-stage CSSX flowsheet. Then, the CSSX flowsheet was demonstrated in a 32-stage unit, first without solvent recycle, then with it. In both cases, the key process goals were achieved: (1) the cesium was removed from the waste with decontamination factors greater than 40,000 and (2) the recovered cesium was concentrated by a factor of 15 in dilute nitric acid. Oak Ridge National Laboratory (ORNL) analysis of the recycled solvent showed no evidence of impurity buildup.
Keywords	Cesium Solvent extraction Radioactive waste processing High-level radioactive wastes Flowsheets Nitric acid Solvents Savannah river plant
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Argonne National Lab., IL.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200125
Contract Number	W-31-109-ENG-38