Solubility relationships of acidified stored metal wastes Page: 6
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. 6 -
HW-17226
UOgHFO^.^HpO, iid not prccipltato this phase at first, and In fact
woro cooled many dogroco until colid RtifOa come out, The irociing
point of Table V Is thus a psoudo-cguilit>rium, ns it is not in
equilibria* vith UOgHPO^.UHgO, a phase which will eventually cone
out.
Thus it is posoiblo to get Into this as testable region by
starting from the llqtild side. If equilibrium were approached from
the solid sido (sludge) it would not likely bo possible to get into
this region.
7. APPLICATION
The opt lam acidity in the TBP process will probably be that con-
centration which viU allow the highest uror.ixn content in the feed, tho
feed to to a oinglo liquid phase. A very interesting process could bo
developed by using enough acid to get woll into tho region vhcro sodium
nitrato precipitates, thus permitting tho removal of ono of tho major
undc-sirablo components of this aquoous food. Such a process would yiold
a very concentrated food, thereby insuring lower procoeo stream volumes
ns woll ns a considerably docontaninatod sodiim nitrate, which might bo
cleaned up enough to crib.(7) Cut since such a procoss cannot iaaed-
iately bo dove loped, the feed concentration must necessarily bo limited
to that which will precipitate neither UOgHPO^.hH^O nor NaNOj.
Tho limitations imposed by UOgHTO^.HHgO oro quite straightforward.
The limitations imposed by tho precipitation of HaNO^ arc moro complc*,
in that they aro govomed by vlAt is ossontially tho concentration of
two extraneous lone, sodium and nitrato. Tho solubility of sodium nl- •
trate is but little affected by the prosenco of uranium In tho concen-
trations covered in this work. In ordor tc recover the uranium from the
waste, all ions must bo taken as they occur, and since the sodium-uranium
ratio is constant, tho oolubility of uranium in this region is determined
by this sodium-uranium ratio as shown in Figure 3* Tho limit of uranyl
phosphate solubility is also shown on thlc plot.
In Figure 2, aro plotted throe food conditions, according to HW #1
(11), HW #2 (10) and HW v3 (9) flowsheets. On each flowsheet the ex-
pected sodivn/uranlua molo ratio is 15 and, since all the points are
below the NUHO3 line, they aro all stable with respect to precipitation
of sodium nitrate. However, since the HW jf-1 flowsheet point is abovo
tho uranyl phosphate lino it is unstable vith respect to uranyl phosphate
procipitation. HW #2 is conditional, while HW #3 has a relatively vide
margin of safety.
The abovo conditions control tho concont rat ions in the feed tank.
In tho column however, only the sodium nitrato is critical, oinco the
uranium concentration dropG off so rapidly that uranyl phosphato pre-
cipitation is no problem. A vory acid scrub (BAS) might precipitate
sodium nitrato in extrone cases.
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Curtis, M. H. Solubility relationships of acidified stored metal wastes, report, March 24, 1950; (https://digital.library.unt.edu/ark:/67531/metadc502855/m1/6/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.