Patent US4514367A successfully refreshed from Google Patents.
US4514367A
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Method for separating rare earth metals
Assignee: Nitivy Co Ltd
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Filing: 1983-05-25
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Granted: 1985-04-30
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Expires: 2003-05-25
Abstract
Abstract Rare earth metals are adsorbed on an ion exchange fiber comprising an ion exchanger having a strong cation exchange group and a weak cation exchange group, and the adsorbed metals are fractionally eluted with an aqueous solution of a chelating agent, whereby the respective rare earth metals can be separated at high efficiency in a short time. According to this method, elution can be accomplished at an elution rate of 5.0 or above in terms of space velocity.
Inventors
- 👤 Tadao Asami
- 👤 Tetsuro Suehiro
- 👤 Hisao Ichijo
- 👤 Aizo Yamauchi
- 👤 Shigeo Ogawa
- 👤 Mitsuo Suzuki
- 👤 Mitsutaka Uzumaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:10
CPC Classifications
C; C22; C22B; C22B59/00; B; B01; B01J; B01J39/00; B01J39/04; B01J39/05; B01J47/00; B01J47/12; B01J47/127; C01; C01F; C01F17/00; C01F17/10; C01F17/13; C01F17/20; C01F17/206; C01F17/224; C01F17/229; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
75 words
In a method for separating gadolinium, samarium, neodymium, praseodymium, and lanthanum prepared from bastnaesite by selectively adsorbing these rare earth metals on an ion exchanger and then fractionally eluting the respective metals with an aqueous solution of a chelating agent, the improvement in that an ion exchange fiber having a sulfonic group and a carboxyl group is used as the ion exchanges, and the elution is conducted at a space velocity of 5.0 or above.
Claim 2
Dependent Claim
75 words
In a method for separating gadolinium, samarium, neodymium, praseodymium, and lanthanum prepared from bastnaesite by selectively adsorbing these rare earth metals on an ion exchanger and then fractionally eluting the respective metals with an aqueous solution of a chelating agent, the improvement in that an ion exchange fiber having a sulfonic group and a carboxyl group is used as the ion exchanges, and the elution is conducted at a space velocity of 5.0 or above.
Claim 3
Dependent Claim
29 words
The method according to claim 1, wherein the ion exchange fiber is one in which the sulfonic carboxyl group molar ratio is within the range of 5:1 to 1:1.
Claim 4
Dependent Claim
27 words
The method according to claim 1, wherein the aqueous solution of a chelating agent is an aqueous solution of an ammonium salt of ethylenediaminetetraacetic or nitrilotriacetic acid.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |