Original scientific paper

Precipitation and Hydrolysis of Uranium(VI) in Aqueous Solutions. III. Uranyl Nitrate - Sodium Carbonate - Strontium Chloride

H. Furedi ; Department of Physical Chemistry, Institute »Ruder Boskovic«, Zagreb, Croatia, Yugoslavia

Abstract

In the precipitation system uranyl nitrate - sodium carbonate
- strontium chloride the influence of changes in concentration
of uranyl nitrate on the precipitation of uranium was studied. The
»concentration maximum« was found to occur when the equivalent
concentrations of the precipitating components are satisfying the
following expressions:
1.5 1[U02(NOah] > 0.7 [U02(N03}2] - 1.36
(1)
(2)
The final pH values of the systems were about 6. It was
shown that expression (1) is valid in the range of 1 X 10-1 N
to 1 X 10-4 N of uranyl nitnte, while expression (2) is valid in
the range of 1 X 10-1 N to 2 X 10-a N of uranyl nitrate.
The coprecipitation of uranium with strontium carbonate
exceeded 850/o when the following relations existed between the
equivalent concentrations of the precipitating components:
[SrCl2] >- [Na2C03] (3)
1[Na2COa] ~ 0.76 [U02(N03}2] + 0.7 (4)
Expression (4) was found to be valid in the range of 6 X 10-2 N to
2 X 10-4 N of uranyl nitrate. The region where more than 850/o of
uranium was coprecipitated was represented by means of a precipitation
body in a coordination system of the concentrations of
strontium chloride (x - axis), sodium carbonate (y - axis) and
uranyl nitrate (z - axis).

Keywords

Hrčak ID:

208291

URI

https://hrcak.srce.hr/208291

Publication date:

27.2.1965.

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