PHASE EQUILIBRIUM STUDIES FOR THE QUATERNARY SYSTEM URANYL NITRATE – ALUMINUM NITRATE – NITRIC ACID – WATER

1963 ◽  
Vol 41 (2) ◽  
pp. 531-536
Author(s):  
Robert D. Thibodeau ◽  
M. Adelman
Keyword(s):  
Phase Equilibrium ◽  
Phase Separation ◽  
Nitric Acid ◽  
Phase Diagrams ◽  
Uranyl Nitrate ◽  
Quaternary System ◽  
Aluminum Nitrate ◽  
Acid Water ◽  
Equilibrium Studies ◽  
Data Phase

The quaternary system UO2(NO3)2−Al(NO3)3−HNO3−H2O) was studied in the temperature range 0–20 °C, and the concentration range of 0–1.5 M Al(NO3)3 and 0–10 N HNO3. From the data, phase diagrams were prepared. No phase separation was evident at 30 °C and above, for the concentrations studied.

PHASE EQUILIBRIUM STUDIES FOR THE TERNARY SYSTEM URANYL NITRATE – NITRIC ACID – WATER

1963 ◽  
Vol 41 (2) ◽  
pp. 527-530 ◽  
Author(s):  
J. Gaunt ◽  
I. J. Bastien ◽  
M. Adelman
Keyword(s):  
Phase Equilibrium ◽  
Phase Separation ◽  
Nitric Acid ◽  
Ternary System ◽  
Uranyl Nitrate ◽  
Solid Phase ◽  
Acid Water ◽  
Wide Concentration Range ◽  
Equilibrium Studies

Phase equilibrium studies were carried out on the system UO2(NO3)2−HNO3−H2O between the temperatures of −10 °C and +49.1 °C over a wide concentration range of both UO2(NO3)2 and HNO3. No phase separation occurred above 49.1 °C for the concentrations studied. The three hydrates of UO2(NO3)2 were identified in the solid phase, and a new complex of UO2(NO3)2, possibly UO2(NO3)2.3HNO3, was separated as the solid phase at higher nitric acid concentrations.

scholarly journals Research on obtaining gadolinium oxide from waste technologies for processing of uranium-gadolinium containing materials

2022 ◽  
Vol 2155 (1) ◽  
pp. 012026
Author(s):  
M K Kylyshkanov ◽  
N N Yaroshenko ◽  
G V Gusakova ◽  
A A Dorn ◽  
A A Gofman ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Solid Waste ◽  
Uranyl Nitrate ◽  
Gadolinium Oxide ◽  
Aluminum Nitrate ◽  
Technological Scheme ◽  
Waste Processing ◽  
Two Stage ◽  
Almost All ◽  
Nitrate Solutions

Abstract One of the activities of the Uranium production of JSC “UMP” is the processing of hard-to-open uranium-gadolinium-containing scraps. When processing materials of this type, after their dissolution, the gadolinium fluoride precipitation operation is carried out with the subsequent extraction purification of the obtained uranyl nitrate solutions. At the deposition stage, almost all the gadolinium contained in the scraps is transferred to the GdF3 precipitate and sent to the tailings dump as part of the solid waste. In order to determine the possibility of obtaining gadolinium oxide from waste processing of uran-gadolinium containing materials, exploratory studies were initiated. In the course of the work, various methods of obtaining gadolinium oxide were tested. A number of experiments were carried out to refine the modes of obtaining gadolinium oxide by the method of two-stage precipitation of oxalate. A technological scheme was developed, according to which a finished product was obtained, suitable for further use in the technology of obtaining uranium-gadolinium tablets of UMP JSC. The scheme consists of the following main operations: dissolution of gadolinium fluoride in a solution of aluminum nitrate, precipitation of gadolinium oxalate, washing of gadolinium oxalate in the first stage of precipitation with a solution of nitric acid, conversion of oxalate to gadolinium hydroxide, dissolution of hydroxide in a solution of nitric acid, re-precipitation of gadolinium oxalate, calcination to gadolinium oxide.

Validity of the Simple Solution Concept for the Aqueous Quaternary System U(IV) Nitrate–U(VI) Nitrate–Nitric Acid–Water

2020 ◽  
Vol 65 (4) ◽  
pp. 1506-1513
Author(s):  
Valentin Dru ◽  
Gilles Bernier ◽  
Solenne Michaud ◽  
Philippe Marc ◽  
Christian Sorel
Keyword(s):  
Nitric Acid ◽  
Quaternary System ◽  
Solution Concept ◽  
Simple Solution ◽  
Acid Water

scholarly journals Notizen: Phasendiagramme von Systemen, bestehend aus Aluminiumhalogeniden und Pyridiniumhalogeniden, III. Die Phasendiagramme der Systeme Aluminiumbromid-Pyridiniumiodid und Aluminiumchlorid-Pyridiniumbromid/Phase Diagrams of Aluminium Halide- Pyridinium Halide Systems, III. Determination of the Phase Diagrams Aluminium Bromide-Pyridinium Iodide and Aluminium Chloride-Pyridinium Bromide

1989 ◽  
Vol 44 (1) ◽  
pp. 102-104
Author(s):  
Gerd Seemann ◽  
Karl Hensen
Keyword(s):  
Phase Equilibrium ◽  
Melting Point ◽  
Phase Diagrams ◽  
Aluminium Chloride ◽  
Acid Base ◽  
Equilibrium Studies ◽  
Pyridinium Bromide ◽  
Molar Ratios ◽  
Congruently Melting

Abstract Phase equilibrium studies of the Lewis acid-base systems AlCl3/PyHBr and AlBr3/PyHI indicate the existence of congruently melting compounds of the molar ratios 1:1 and 2:3.These results are quite different from those of our studies of the AlCl3/PyHCl and the AlBr3/PyHBr systems, in which four compounds in the molar ratios 1:1, 1:2, 1:3, and 2:3 could be detected.The melting point of pyridinium iodide observed at 284,8 °C (decomp.) differs from the previously reported one.

scholarly journals Study of Phase Equilibrium of NaBr + KBr + H2O and NaBr + MgBr2 + H2O at 313.15 K

2017 ◽  
Vol 2017 ◽  
pp. 1-6
Author(s):  
Qing Chen ◽  
Jiping She ◽  
Yang Xiao
Keyword(s):  
Phase Equilibrium ◽  
Ternary System ◽  
Phase Diagrams ◽  
Invariant Point ◽  
Ternary Systems ◽  
Complex Salt ◽  
Chemical Methods ◽  
Data Phase ◽  
Saturation Method ◽  
Solid Phases

The phase equilibrium for the ternary systems NaBr + KBr + H2O and NaBr + MgBr2 + H2O at 313.15 K was investigated by isothermal solution saturation method. The solubilities of salts and the densities of saturated solutions in these ternary systems were determined by chemical methods, while the equilibrium solid phases were analyzed by Schreinermarker wet residues method. Based on the experimental data, phase diagrams and density versus composition diagrams were plotted. The two ternary systems were type of simple common-saturation and without complex salt and solid solution. There are in all two crystalline regions, two univariant curves, and one invariant point in these phase diagrams of two ternary systems at 313.15 K. The equilibrium solid phases in the ternary system NaBr + KBr + H2O are KBr and NaBr·2H2O, and those in the ternary system NaBr + MgBr2 + H2O are NaBr·2H2O and MgBr2·6H2O.

Correction - "Volumetric and Phase Behavior in the Nitric Acid—Water System"

1956 ◽  
Vol 48 (4) ◽  
pp. 816-816
Author(s):  
C. H. Duffy ◽  
W. H. Corcoran ◽  
B. H. Sage
Keyword(s):  
Nitric Acid ◽  
Phase Behavior ◽  
Water System ◽  
Acid Water

Thermal Stability and Safe Venting of the Tri-N-Butyl Phosphate-Nitric Acid-Water (“Red Oil”) System - I: Two-Layer System Mass Transfer Theory

2008 ◽  
Vol 163 (2) ◽  
pp. 285-293 ◽  
Author(s):  
Michael Epstein ◽  
Hans K. Fauske ◽  
Charles F. Askonas ◽  
Marc A. Vial ◽  
Patricia Paviet-Hartmann
Keyword(s):  
Thermal Stability ◽  
Mass Transfer ◽  
Nitric Acid ◽  
Acid Water ◽  
Layer System ◽  
Transfer Theory ◽  
Mass Transfer Theory
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