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THE REMOVAL OF ACTINIDE ELEMENTS FROM HIGH LEVEL RADIOACTIVE WASTE BY TRIALKYL PHOSPHINE OXIDE (TRPO) EXTRACTION——THE STRIPPING OF ACTINIDE ELEMENTS FROM LOADED TRPO ORGANIC PHASE

Hu Y

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Abstract

The stripping behavior of actinide elements loaded in 30% TRPO-kerosene solution with nitric acid,oxalic acid and sodium carbonate solution is studied and stripping parameters are given. Americium and lanthanide elements can be effectively stripped with 5-6mol/l nitric acid,but at higher nitric acid concentration third phase would appear. More than 99% neptunium and plutonium could be recovered in two times stripping by 0. 5 mol/l oxalic acid with crossflow. Uranium is stripped with sodium carbonate. The cross contamination between the three fractions are very little. A proposed flowsheet for the removal of actinide elements from high level radioactive waste by TRPO extraction is presented.

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What this paper is about

The stripping behavior of actinide elements loaded in 30% TRPO-kerosene solution with nitric acid,oxalic acid and sodium carbonate solution is studied and stripping parameters are given. Americium and lanthanide elements can be effectively stripped with 5-6mol/l nitric acid,but at higher nitric acid concentration third phase would appear. More than 99% neptunium and plutonium could be recovered in two times stripping by 0. 5 mol/l oxalic acid with crossflow. Uranium is stripped with sodium carbonate. The cross contamination between the three fractions are very little. A proposed flowsheet for the removal of actinide elements from high level radioactive waste by TRPO extraction is presented.

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Available abstract

The stripping behavior of actinide elements loaded in 30% TRPO-kerosene solution with nitric acid,oxalic acid and sodium carbonate solution is studied and stripping parameters are given. Americium and lanthanide elements can be effectively stripped with 5-6mol/l nitric acid,but at higher nitric acid concentration third phase would appear. More than 99% neptunium and plutonium could be recovered in two times stripping by 0. 5 mol/l oxalic acid with crossflow. Uranium is stripped with sodium carbonate. The cross contamination between the three fractions are very little. A proposed flowsheet for the removal of actinide elements from high level radioactive waste by TRPO extraction is presented.

Key concepts: Nitric acid, Chemistry, Actinide, Oxalic acid, Americium, Stripping (fiber), Plutonium, Uranium

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THE REMOVAL OF ACTINIDE ELEMENTS FROM HIGH LEVEL RADIOACTIVE WASTE BY TRIALKYL PHOSPHINE OXIDE (TRPO) EXTRACTION——THE STRIPPING OF ACTINIDE ELEMENTS FROM LOADED TRPO ORGANIC PHASE — Research Paper | ScholarLens