Precipitation stripping of neodymium from carboxylate extractant with aqueous oxalic acid solutions

Journal Article · Sat May 01 00:00:00 EDT 1993 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00017a023· OSTI ID:6344331

Konishi, Yasuhiro; Asai, Satoru; Murai, Tetuya ^[1]

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1. Univ. of Osaka Prefecture (Japan)

This paper describes a precipitation stripping method in which neodymium ions are stripped from carboxylate extractant in organic solvent and simultaneously precipitated with aqueous oxalic acid solution. For the single-stage process, a quantitative criterion for precipitating oxalate powders was derived theoretically, and stripping experiments were done under the precipitation conditions. The resultant precipitates were neodymium oxalate, which is completely free from contamination by the carboxylate extractant and the organic solvent. The overall rate of stripping was controlled by the transfer of neodymium carboxylate in the organic solution, indicating that the presence of oxalic acid in the aqueous phase has no effect on the stripping rate. These findings demonstrate the feasibility of combining the conventional stripping and precipitation stages in a solvent extraction process for separation and purification of rare earths.

• OSTI ID: 6344331
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Vol. 32:5; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
NEODYMIUM
PRECIPITATION
SOLVENT EXTRACTION
CARBOXYLIC ACIDS
NEODYMIUM COMPOUNDS
OXALATES
OXALIC ACID
RARE EARTHS
SEPARATION PROCESSES
CARBOXYLIC ACID SALTS
DICARBOXYLIC ACIDS
ELEMENTS
EXTRACTION
METALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
RARE EARTH COMPOUNDS
400105* - Separation Procedures