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Title:
SEPARATION OF RARE EARTH ELEMENT FROM EACH OTHER
Document Type and Number:
Japanese Patent JPH02133532
Kind Code:
A
Abstract:

PURPOSE: To recover high-purity rare earth elements at a high recovery rate by using a spherical cation exchanger having a sulfonic acid group and a weakly acidic cation exchange group for the cation exchanger at the time of separating the rare earth elements from each other by using a complex forming agent and the cation exchanger.

CONSTITUTION: The spherical cation exchanger having the sulfonic acid group and the weakly acidic cation exchange group is used for the cation exchanger at the time of subjecting the rare earth elements to a chromatographic sepn. by using the complex forming agent and the cation exchanger. The sphericity of ≥90% of this cation exchanger is about ≤2.0 and the average grain size thereof is about 20 to 300μ. The average grain size of ≥80% of the entire particle is about 0.5 to 1.5 times the average grain size. The total cation exchange capacity is specified to about 0.5 to 10meq/g on a dry basis. The weakly acidic cation exchange group is preferably a carboxylic acid group and the exchange capacity thereof is preferably about 5 to 90% of the total cation exchange capacity. EDTA, HEDTA, DCPA, etc., are used for the complex forming agent and the pH of the aq. soln. thereof is specified to about 4 to 10.


Inventors:
ETO NOBUO
MURAKAMI TSUGIO
YOSHIMURA RYOJI
MATSUDA TAKAO
TAKADA YUTAKA
Application Number:
JP1988000283733
Publication Date:
May 22, 1990
Filing Date:
November 11, 1988
Export Citation:
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Assignee:
TOSOH CORP
International Classes:
C22B59/00; (IPC1-7): C22B59/00
Domestic Patent References:
JPS5377888A1978-07-10
JPS5732341A1982-02-22
JPS5735650A1982-02-26
JPS5845341A1983-03-16
JPS5976838A1984-05-02