Chelant screening and refinement tests - Phase I, Task 2. Topical progress report, December 1993--June 1994 Page: 13 of 236
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(3) The carbonate/peroxide solvent caused negligible corrosion to the metals being
tested when applied at either room temperature or 93*C. The EDTA/carbonate/
peroxide solvent was not corrosive at room temperature; however, when applied
at 93*C, significant general corrosion, of a uniform nature, was observed on
carbon steel. Such corrosion is required for removal of contamination embedded
in base metal grain boundaries.
(3) Metal surface area to solvent volume ratio was found to be an important process
variable. Increased metal content in the system resulted in enhanced
decomposition of hydrogen peroxide. Therefore, care must be taken to maintain
a sufficient level of peroxide to effectively promote uranium dissolution.
(4) Foaming tests performed were a qualified success. Foam application of the
selected solvents appeared to be feasible, since they effected rapid uranium
dissolution at room temperature.
(5) The selected application scenario resulted in a solvent performance which met the
proposed acceptance criteria (>90% of available uranium dissolved and >2 mils
corrosion on carbon steel in eight hour period).
It is recommended that both the EDTA/carbonate/peroxide and carbonate/peroxide
solvents be evaluated in the bench scale and pilot plant phases of this program. The
recommended application sequence for both solvents is:
(1) Hold two hours at room temperature
(2) Heatup to 93*C and hold four hours
(3) Cooldown to room temperature and spike with peroxide
(4) Hold two hours at room temperature.
Additional foam application testing with more suitable test specimens (preferably
contaminated process equipment) is also recommended.
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Chelant screening and refinement tests - Phase I, Task 2. Topical progress report, December 1993--June 1994, report, July 1, 1995; United States. (https://digital.library.unt.edu/ark:/67531/metadc680875/m1/13/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.