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Separation of individual lanthanides through the combined techniques of urea fractionated homogeneous precipitation and ion exchange

Technical Report:

Abstract

The separation of individual lanthanides, especially Ce, Nd, Pr, Sm and La, from a rare earth chlorides concentrate by the industrial processing of monazite sand is made. To reach this goal the homogeneous fractional precipitation and ion exchange techniques were combined. Using the rare earths concentrate depleted in Cerium, fractions enriched in Nd, Pr and Sm, and one final filtrate enriched in La were obtained, by the hydrolysis of urea. The separation of individual lanthanides (Nd, Pr, Sm and La) was accomplished using two strong cationic ion exchanger columns, the second with Cu(II) as retaining ion, and EDTA-NH/sub 4/ solution buffered with acetic acid as eluant. The annoying problem of precipitation into the column during the RE elution was solved. The difficult EDTA and Cu(II) recovery was the precipitation of Cu/sub 2/S and disruption of Cu-EDTA complex by hydrolysis of thiourea. The combination of both techniques allowed the preparation of individual lanthanides as Nd, Pr and La with 99% and Sm with 90% purity.
Authors:
Publication Date:
Jun 01, 1975
Product Type:
Technical Report
Report Number:
IEA-395
Reference Number:
AIX-08-302896; EDB-77-094730
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CERIUM; SEPARATION PROCESSES; LANTHANUM; NEODYMIUM; PRASEODYMIUM; SAMARIUM; CHLORIDES; EDTA; FILTRATION; HYDROLYSIS; ION EXCHANGE; PRECIPITATION; RARE EARTH COMPOUNDS; RARE EARTHS; THIOUREA; UREA; AMIDES; AMINO ACIDS; ANTITHYROID DRUGS; CARBONIC ACID DERIVATIVES; CARBOXYLIC ACIDS; CHELATING AGENTS; CHEMICAL REACTIONS; CHLORINE COMPOUNDS; DECOMPOSITION; DRUGS; ELEMENTS; HALIDES; HALOGEN COMPOUNDS; LYSIS; METALS; ORGANIC ACIDS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; ORGANIC SULFUR COMPOUNDS; SOLVOLYSIS; THIOUREAS; 400105* - Separation Procedures
OSTI ID:
7112955
Research Organizations:
Instituto de Energia Atomica, Sao Paulo (Brazil). Divisao de Engenharia Quimica
Country of Origin:
Brazil
Language:
Portuguese
Availability:
NTIS, PC A03/MF A01.
Submitting Site:
INIS
Size:
Pages: 46
Announcement Date:
May 13, 2001

Technical Report:

Citation Formats

Umeda, K, and Abrao, A. Separation of individual lanthanides through the combined techniques of urea fractionated homogeneous precipitation and ion exchange. Brazil: N. p., 1975. Web.
Umeda, K, & Abrao, A. Separation of individual lanthanides through the combined techniques of urea fractionated homogeneous precipitation and ion exchange. Brazil.
Umeda, K, and Abrao, A. 1975. "Separation of individual lanthanides through the combined techniques of urea fractionated homogeneous precipitation and ion exchange." Brazil.
@misc{etde_7112955,
title = {Separation of individual lanthanides through the combined techniques of urea fractionated homogeneous precipitation and ion exchange}
author = {Umeda, K, and Abrao, A}
abstractNote = {The separation of individual lanthanides, especially Ce, Nd, Pr, Sm and La, from a rare earth chlorides concentrate by the industrial processing of monazite sand is made. To reach this goal the homogeneous fractional precipitation and ion exchange techniques were combined. Using the rare earths concentrate depleted in Cerium, fractions enriched in Nd, Pr and Sm, and one final filtrate enriched in La were obtained, by the hydrolysis of urea. The separation of individual lanthanides (Nd, Pr, Sm and La) was accomplished using two strong cationic ion exchanger columns, the second with Cu(II) as retaining ion, and EDTA-NH/sub 4/ solution buffered with acetic acid as eluant. The annoying problem of precipitation into the column during the RE elution was solved. The difficult EDTA and Cu(II) recovery was the precipitation of Cu/sub 2/S and disruption of Cu-EDTA complex by hydrolysis of thiourea. The combination of both techniques allowed the preparation of individual lanthanides as Nd, Pr and La with 99% and Sm with 90% purity.}
place = {Brazil}
year = {1975}
month = {Jun}
}