Separate Crystallization of Lanthanide Oxalates and Calcium Oxalates from Nitric Acid Solutions

Zinin, D. S.; Bushuev, N.N.

doi:10.1134/s003602361809022x

Cited by 4 publications

(3 citation statements)

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“… 1 , 2 Indeed, actinide oxalates have proven useful in lanthanide/actinide separation from their solutions. 1 , 3 , 4 Oxalates are simply low-cost but high-quality precursors for materials with interesting properties, such as nuclear fuels, 5 − 8 metal–organic frameworks, 9 , 10 oxygen conductors, 11 or molecular magnets. 12 …”

Section: Introductionmentioning

confidence: 99%

“…One of the most widely used precipitating agents is oxalic acid, which forms insoluble precipitates with most of transition metal ions, lanthanides, and actinides. , Indeed, actinide oxalates have proven useful in lanthanide/actinide separation from their solutions. ,, Oxalates are simply low-cost but high-quality precursors for materials with interesting properties, such as nuclear fuels, − metal–organic frameworks, , oxygen conductors, or molecular magnets …”

Section: Introductionmentioning

confidence: 99%

“…1,2 Indeed, actinide oxalates have proven useful in lanthanide/actinide separation from their solutions. 1,3,4 Oxalates are simply low-cost but highquality precursors for materials with interesting properties, such as nuclear fuels, 5−8 metal−organic frameworks, 9,10 oxygen conductors, 11 or molecular magnets. 12 In the present work, we aimed on the development of a homogeneous precipitation of oxalates to achieve slower kinetics of precipitation and therefore larger crystals than usually obtained.…”

Section: ■ Introductionmentioning

confidence: 99%

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Homogeneous Precipitation of Lanthanide Oxalates

2022

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Oxalic acid is an important separation agent in the technology of lanthanides, actinides, and transition metals. Thanks to the low solubility of the oxalate salts, the metal ions can be easily precipitated into crystalline material, which is a convenient precursor for oxide preparation. However, it is difficult to obtain oxalate monocrystals due to the fast precipitation. We have developed a synthetic route for homogeneous precipitation of oxalates based on the thermal decomposition of oxamic acid. This work primarily concerns lanthanide oxalates; however, since no information was found about oxamic acid, a brief characterization was included. The precipitation method was tested on selected elements (Ce, Pr, Gd, Er, and Yb), for which the kinetics was determined at 100 °C. Several scoping tests at 90 °C or using different starting concentrations were performed on Ce and Gd. The reaction products were studied by means of solid-state analysis with focus on the structure and morphology. Well-developed microcrystals were successfully synthesized with the largest size for gadolinium oxalate.

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