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In recovery of Cs from nitric acid solutions in the form of phosphomolybdate of variable composition Cs x H3−x PO4·12MoO3·nH2O (x = 3.0−0.8), its content in the solid phase depends on the presence of some other compounds in solution. The impurities can act differently, competing with cesium in precipitate formation, decreasing the oxidant excess, or decomposing the phosphomolybdate anion. Nevertheless, even in the presence of many foreign compounds cesium can be recovered selectively and quantitatively with the formation of a concentrate containing up to ∼150 mg of Cs per gram of the dried precipitate. Cesium can be further concentrated (up to ∼500 mg of Cs per gram) by dissolving the phosphomolybdate in NaOH and precipitating at pH ≈ 10 the known double cesium magnesium phosphate.
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Original Russian Text © D.N. Bykhovskii, T.I. Kol’tsova, E.M. Roshchinskaya, 2009, published in Radiokhimiya, 2009, Vol. 51, No. 2, pp. 140–144.
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Bykhovskii, D.N., Kol’tsova, T.I. & Roshchinskaya, E.M. Cesium preconcentration by recovery from solutions in the form of phosphomolybdate. Radiochemistry 51, 159–164 (2009). https://doi.org/10.1134/S1066362209020118
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DOI: https://doi.org/10.1134/S1066362209020118