Pilot Plant Development Studies of a Continuous Process for Recovering Uranium from Nichrome Fuels Page: 41
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1. Effect of Vapor/Liquid Ratio (V/L)
The molar vapor/liquid ratio was varied between 0.256 and
0.667 for these studies. Results obtained generally showed that in-
creasing the vapor/liquid ratio decreases the quantity of chloride
remaining in the kettle product. Figures 15, 16, and 17 present the
data obtained in the three columns.
A problem of major concern in this process is the disposition
of the column overhead stream. The most logical use for this stream is
as fuel dissolvent. Examination of the data indicates that this stream
is reusable, i.e., contains no excess water, if the chloride concentra-
tion is at least 1.4 molar. The maximum V/L at which this concentration
occurs is approximately 0.4. Therefore, further consideration of a
flowsheet assumes the use of a molar V/L of 0.4 in the stripping column.
2. Chloride Removal Performance
The average chloride concentration in the feed used for the
chloride stripping studies was 20.7 grams per liter (16,000 ppm). It
is necessary to limit the maximum chloride concentration to 100 ppm in
the extraction column feed stream (extraction columns are constructed
of type 348 stainless steel). This requires a chloride removal perform-
ance (concentration of chloride in feed/concentration of chloride in
kettle) in the stripping column of at least 160. Values obtained in
this work increased from 3 to 11,000 as the molar V/L increased from
0.28 to 0.667. Figures 18, 19, and 20 present these data.I0,000
1 00 \
I-
-L GLASS HELICES
4
10 0 4' OF PACKING
o X 6.3' OF PACKING
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
MOLAR VAPOR-LIQUID RATIO ()
CPP-S- 2075
Figure 15
Effect of Vapor/Liquid Ratio on
Product Chloride Concentration
One-Inch Diameter ColumnMOLAR VAPOR-LIQUID RATIO (Y)
Figure 16
CPP- S- 2076
Effect of Vapor/Liquid Ratio on
Product Chloride Concentration
Two-Inch Diameter Column-41-
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Chamberlain, H. V. Pilot Plant Development Studies of a Continuous Process for Recovering Uranium from Nichrome Fuels, report, June 20, 1962; [Idaho Falls, Idaho]. (https://digital.library.unt.edu/ark:/67531/metadc67265/m1/41/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.