An experimental study on high-purity uranium refining by passing in succession through pulsed extraction, washing, and stripping columns

Nuclear-purity uranium was refined by passing a solution of uranyl nitrate in 3–5 M HNO 3 in succession through pulsed extraction, washing, and stripping columns for feeding into the U(III)–U(IV) chemical exchange system for uranium isotope separation. The extractant (tri- n -butyl phosphate, TBP),...

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Bibliographic Details
Published in:Russian journal of applied chemistry 2017-06, Vol.90 (6), p.972-976
Main Authors: Chol, Choe Gwang, Bom, Ri Song, Song, Pak Ho, Chol, Jon Un
Format: Article
Language:English
Subjects:
Acidic oxides
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Cobalt
Copper
Industrial Chemistry/Chemical Engineering
Iron
Isotope separation
Kerosene
Lead
Nickel
Nitric acid
Oxidation
Purification
Purity
Silver
Stripping
Transition metals
Uranium
Various Technological Processes
Washing
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Summary:Nuclear-purity uranium was refined by passing a solution of uranyl nitrate in 3–5 M HNO 3 in succession through pulsed extraction, washing, and stripping columns for feeding into the U(III)–U(IV) chemical exchange system for uranium isotope separation. The extractant (tri- n -butyl phosphate, TBP), the diluent (kerosene), nitric acid, ammonium carbonate, sodium nitrate, and water were preliminarily refined to chemical purity. The diameter and height of pulsed columns for uranium purification was 25 and 1500 mm, respectively, and the pulse frequency was 1 s –1 . The content of transition metals (Fe, Co, Ni, Cu, Ag) and Pb, which can catalyze the U(III) oxidation in acidic aqueous solutions, was reduced to the level lower than 1 ppm (10 –4 %). The total purification factor was higher than 103. The purification required 3–4 theoretical plates with HETP of the columns of 35–40 cm.
ISSN:1070-4272
1608-3296
DOI:10.1134/S1070427217060209