Uranium, thorium, and REE behavior in oxalate and oxalate-formate media

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Resumo

Thorium, uranium, and REE behavior in oxalic and oxalic–formate media was investigated. Thorium oxalate solubility in ammonium formate was determined. Some advice for uranium separation from thorium and REE was made. It is preferred to precipitate REE oxalates and to precipitate thorium oxalate with a non-isotopic carrier.

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Sobre autores

А. Kornilov

State Scientific Center-Research Institute of Atomic Reactors

Email: osdmitrieva@niiar.ru
Rússia, Zapadnoe shosse 9, Dimitrovgrad, Ulyanovsk oblast, 433510

O. Dmitrieva

State Scientific Center-Research Institute of Atomic Reactors

Autor responsável pela correspondência
Email: osdmitrieva@niiar.ru
Rússia, Zapadnoe shosse 9, Dimitrovgrad, Ulyanovsk oblast, 433510

Е. Vasyunina

State Scientific Center-Research Institute of Atomic Reactors

Email: osdmitrieva@niiar.ru
Rússia, Zapadnoe shosse 9, Dimitrovgrad, Ulyanovsk oblast, 433510

K. Kopaneva

State Scientific Center-Research Institute of Atomic Reactors

Email: osdmitrieva@niiar.ru
Rússia, Zapadnoe shosse 9, Dimitrovgrad, Ulyanovsk oblast, 433510

A. Zamaltdinova

State Scientific Center-Research Institute of Atomic Reactors

Email: osdmitrieva@niiar.ru
Rússia, Zapadnoe shosse 9, Dimitrovgrad, Ulyanovsk oblast, 433510

N. Pozigun

State Scientific Center-Research Institute of Atomic Reactors

Email: osdmitrieva@niiar.ru
Rússia, Zapadnoe shosse 9, Dimitrovgrad, Ulyanovsk oblast, 433510

V. Boldakov

State Scientific Center-Research Institute of Atomic Reactors

Email: osdmitrieva@niiar.ru
Rússia, Zapadnoe shosse 9, Dimitrovgrad, Ulyanovsk oblast, 433510

S. Poglyad

State Scientific Center-Research Institute of Atomic Reactors

Email: osdmitrieva@niiar.ru
Rússia, Zapadnoe shosse 9, Dimitrovgrad, Ulyanovsk oblast, 433510

Bibliografia

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2. Fig. 1. Determination of uranium solubility depending on the pH of the medium and the molar ratio of oxalate ions and uranium using mathematical modeling.

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3. Fig. 2. Determination of uranium solubility and concentration of dioxalatouranilate anion depending on the pH of the medium and excess of oxalate ions using mathematical modeling. Initial uranium concentration 0.7 mol/l.

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4. Fig. 3. Determination of the solubility of europium depending on the pH of the medium and the concentration of oxalate ions using mathematical modeling.

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5. Fig. 4. Concentration of thorium in mother solutions of oxalate precipitation depending on the acidity of the medium.

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6. Fig. 5. Dependence of thorium concentration in the mother liquor on pH.

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7. Fig. 6. Dependence of the concentrations of uranium, thorium and europium in solution on the molar ratio of oxalate anions and uranium.

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8. Fig. 7. Concentrations of uranium, thorium and europium in the solution above the precipitates of their oxalates depending on the pH of the ammonium formate solution. The concentration of ammonium formate is 2 mol/l.

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9. Fig. 8. Concentration of uranium, thorium and europium in solution above precipitates of their oxalates depending on the concentration of ammonium formate solution. pH 3.5.

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10. Fig. 9. Dependence of the thorium concentration in washing solutions on the concentration of ammonium formate.

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