Solubility relationships of acidified stored metal wastes Page: 4
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. u -
An upper Halt on the oncunt of
of precipitation of sodium nitrate.
In acidified vtulo actal solution le
acid which nay be uaud is the point
The solubility of sodium nitrate
log Ho ■ 1.371 - 1.521 log H*
where 1 Ha' * Moles of sodiun ion present,
H' » Holes of "titratable acid" present,
More nitrate than sodium is pro sent, and other ions from wacto
metal recovery oro present in flowshcot proportions.
The data In this report deal primarily with solubilities at 25°C.
Freezing points voro also obtained on a meter of solutions, ao the first
6tcp in obtaining tonpemturc coofflcionts of the solubilities pre-
viously mentioned, and to see if any now solid phases would appear at
rv. Discussion qf results
A. Uranyl Phosphate System.
Uranyl hydrogen phosphate precipitates very' slowly from solution
ao lias been dlscuoocd in many papor6 (1-6). Some unpublishod data
by M. K. Harmon have shown that attainment of equilibrium requires
20 to 30 days at 25°C. Hence, tho solubility ooaploa of Tablo I
voro made up by combining stock solutions, and though supereatvrnted
with respect to uranyl phosphato precipitation, could be coolod to
tho point of precipitation of sodium nitrato. Those solutions voro
nloo otablo enough for analysis. After tho freozing point of each
solution with rospoct to sodium nitrate was determined, the samplos
were stored in a 25.0°C. bath for tho period indicatod. Aftor this
interval, tho solids voro tonovod end tho solutions wore analyzod.
The solutions of Tablo II were lihowiso prepared by combining
stock solutions, but gave precipitates on mixing. For samples
15-191 tho slurries wore hosted to 100°C., without attaining solu-
tion. Theso solutions of lover acidity aro much more suporsaturatod
than thoso of Tabic I, and hence might bo oxpoctod to prccipltato
a uranyl phosphate at once. It is also possible (and consistent
with the appoaranco of the slurrios) that tho materiel which pre-
cipitated undor those conditions was (UOgJ^fPOj )« which was slowly
converted to UOgHPOh.UHgO. Solution 26 probably also bolongo In
this class, but^vas not heatod. Solution 32 also was not heated,
but it is beliovod that tho procipitato that formed imaodiatoly was
Tablo III preoonts the solutions fron Tcblco I and II, in order
of increasing acidity (solution 9 la not included because of oxcoss
phosphate). This table shows a direct relationship betvoon acidity
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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/m1/4/: accessed June 27, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.