Preparation of controlled particle size U/sub 3/O/sub 8/ by uranyl formate precipitation and calcination
Description: A conceptual process flowsheet for preparation of U/sub 3/O/sub 8/ by precipitating uranyl formate monohydrate with excess formic acid and calcining it was developed and demonstrated on a laboratory scale. The product U/sub 3/O/sub 8/ has a particle size distribution apropriate for fabrication of U/sub 3/O/sub 8/-Al fuel by powder metallurgy. The U/sub 3/O/sub 8/ particles are crystalline, do not exceed 150 ..mu..m in diameter, and have a narrow particle size distribution with most particles within the range of 44 to 150 ..mu..m. A ten-fold decontamination of uranium from low-level fission products during uranyl formate precipitation was demonstrated. Minimal variations in U/sub 3/O/sub 8/ particle size distribution as a function of various uranyl formate precipitation conditions were observed. Preliminary tests demonstrated that calcination of uranyl formate monohydrate recovered from solution by evaporation to dryness did not produce U/sub 3/O/sub 8/ with the desired particle size distribution. Calcination of uranyl oxalate, uranous oxalate, or uranous formate also did not produce U/sub 3/O/sub 8/ with the appropriate particle size distribution.
Date: November 1, 1978
Creator: Johnson, D.R.
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Partner: UNT Libraries Government Documents Department