Cocrystallization of Uranyl and Plutonyl Nitrate Hexahydrates

Journal Article · Sat Sep 15 04:00:00 EDT 2018 · Atomic Energy (New York)

DOI:https://doi.org/10.1007/S10512-018-0416-3· OSTI ID:22809825

Volk, V. I.; Veselov, S. N.; Arseenkov, L. V.; Dvoeglazov, K. N.; Shadrin, A. Yu. ^[1]; Zenchenko, E. V.; Cheshuyakov, S. A.; Kruglov, S. N. ^[2]

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1. Bochvar High-Technology Research Institute for Inorganic Materials (VNIINM) (Russian Federation)
2. Siberian Chemical Combine (SCC) (Russian Federation)

In the system UO{sub 2}(NO{sub 3}){sub 2}–PuO{sub 2}(NO{sub 3}){sub 2}–HNO{sub 3}–H{sub 2}O with the ratio Pu/(U + Pu) = 0.3–0.5 and stabilization of the pair U(VI)–Pu(VI), the crystallization of (U, Pu)O{sub 2}(NO{sub 3}){sub 2}·6H{sub 2}O occurs in accordance with the metric of the phase diagram of the system UO{sub 2}(NO{sub 3}){sub 2}–HNO{sub 3}–H{sub 2}O with coefficient of cocrystallization of plutonium 0.804 ± 0.028. This condition holds in the sector of the working lines of the crystallization process that correspond to the minimum content of uranium in the mother solution. The degree of enrichment of the mother solution is determined by the crystallization temperature, i.e., the mass fraction of the mother solution in the total mass of the system. The constancy of the coefficient of cocrystallization with the technologically important parameters of the process makes it possible to use the metric of the solubility diagram of the system UO{sub 2}(NO{sub 3}){sub 2}–HNO{sub 3}–H{sub 2}O to calculate the crystallization of (U, Pu)O{sub 2}(NO{sub 3}){sub 2}·6H{sub 2}O with the crystalline phase with the required composition being obtained.

• OSTI ID: 22809825
• Journal Information: Atomic Energy (New York), Journal Name: Atomic Energy (New York) Journal Issue: 5 Vol. 124; ISSN 1063-4258
• Country of Publication: United States
• Language: English

Related Subjects

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
CRYSTALLIZATION
ENRICHMENT
MASS
NITRATES
NITRIC ACID
NITROGEN OXIDES
PHASE DIAGRAMS
PLUTONIUM
PLUTONIUM OXIDES
SOLUBILITY
STABILIZATION
URANIUM
URANIUM DIOXIDE