Cesium Eluate Evaporation Solubility and Physical Property Behavior

Pierce, R.A.

Savannah River Site (S.C.)

关键词: Low-Level Radioactive Wastes;    Flowsheets;    Physical Properties;    Evaporation;    Computerized Simulation;   

DOI  :  10.2172/811935
RP-ID  :  WSRC-TR-2002-00411
RP-ID  :  AC09-96SR18500
RP-ID  :  811935

美国|英语

来源: UNT Digital Library

【 摘 要 】

The baseline flowsheet for low activity waste (LAW) in the Hanford River Protection Project (RPP) Waste Treatment Plant (WTP) includes pretreatment of supernatant by removing cesium using ion exchange. When the ion exchange column is loaded, the cesium will be eluted with a 0.5M nitric acid (HNO3) solution to allow the column to be conditioned for re-use. The cesium eluate solution will then be concentrated in a vacuum evaporator to minimize storage volume and recycle HNO3. To prevent the formation of solids during storage of the evaporator bottoms, criteria have been set for limiting the concentration of the evaporator product to 80 percent of saturation at 25 degrees C. Prior work has collected fundamental data for predicting solubility and other physical property measurements. Other ongoing efforts have involved the development of a computer model to predict solubility and physical properties during evaporation. Evaporation experiments were conducted with cesium eluate simulant generated from a pilot scale experiment in the Thermal Fluids Lab (TFL) at the Savannah River Technology Center (SRTC). The data from the experiments will be used to validate the modeling data.