PHYSICAL CHARACTERIZATION OF ACIDIC AND NEUTRALIZED SYNTHETIC FUEL REPROCESSING WASTE SOLUTIONS ON EVAPORATION AND CALCINATION
Five synthetic fuel reprocessing waste solutions have been subjected to physical and chemical treatments designed to reduce the volume and make the residue more suitable for storage or for further treatment prior to disposal. Evaporation of acidic wastcs to dryness gave solid residues with volumes of 6.8% (of original waste volume) for Purex. 24% for TBP-25, 15% for STR, 9.2% for Darex, and 3% for SIR. Condensates were approximately the volume of the original waste. Calcination of these dried residues at 900 deg C gave reductions in weight (referred to dry residue) of 43% for Purex, 58% for TBP-25, 34% for STR, 9% for Darex, and 74% for SIR. Neutralization with NaOH gave slow-settling, poorly filterable precipitates. Precipitates from neutralization with Ca(OH)/ sub 2/ settled more rapidly and could be filtered with less difficulty. None of the precipitates was considered suitable for commercial filtration equipment. A flocculating agent (IFA-313, Illinois Water Treatment Company) increased settling rates in some cases. Maximum settling rates were attained with SHR waste neutralized with Ca(OH)/sub 2/. Unfiltered, neutralized wastes were evaporated to dryness and produced residues having volumes of 10% to 50% of original waste volume. Evaporation of the neutralized waste might be more desirable from the standpoint of reducing the volatility of certain fission products and reducing corrosion of equipment. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-13-008221
- OSTI ID:
- 4274875
- Report Number(s):
- ORNL-2566
- Country of Publication:
- United States
- Language:
- English
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