US3821352A
Expired / Lapsed
US
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Process for separation of yttrium from the lanthanides
Assignee: Forskningsgruppe for Sjeldne Jordarter
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Filing: 1973-01-26
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Granted: 1974-06-28
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Expires: 1993-01-26
Abstract
Abstract An improved liquid-liquid extraction process for the separation of yttrium values from the elements of the lanthanide series and other impurities is disclosed. The light lanthanide elements are separated by extraction from an aqueous nitrate solution with an organic solution of a quaternary ammonium nitrate, and the heavy lanthanides are subsequently removed from the aqueous solution by extraction with an organic solution of a quaternary ammonium thiocyanate.
Inventors
- 👤 B Gaudernack
- 👤 G Hannestad
- 👤 I Hundere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:09
CPC Classifications
C; C22; C22B; C22B59/00; C01; C01F; C01F17/00; C01F17/10; C01F17/17; C01F17/20; C01F17/206; C01F17/218; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
151 words
A process for the separation of yttrium values from the lanthanide elements which comprises the steps of: a. dissolving a product containing lanthanide elements and yttrium values in an acidic aqueous solution; b. contacting said aqueous solution with a thiocyanate having a cation selected from the group consisting of quaternary ammonium compounds, other organic nitrogen containing and organophosphorous compounds, said thiocyanate being in significant amount and being dissolved in an organic solvent which is relatively immiscible with water; c. whereby a first aqueous raffinate phase and a first organic extract phase are formed; d. separating said first aqueous raffinate phase from said first organic extract phase; e. eliminating the thiocyanate ion from the said first aqueous raffinate phase; f. contacting said solution with a quaternary ammonium nitrate said quaternary ammonium nitrate being dissolved in an organic solvent which is relatively immiscible with water; and said quaternary ammonium nitrate having the formula
Claim 2
Dependent Claim
13 words
The process of claim 1 wherein the quaternary ammonium nitrate is methyl-tricapryl-ammonium nitrate.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein the quaternary ammonium nitrate is formed in situ by contacting a quaternary ammonium salt with an easily soluble nitrate salt.
Claim 4
Dependent Claim
26 words
The process of claim 1 wherein the quaternary ammonium thiocyanate is formed in situ by contacting a quaternary ammonium salt with an easily soluble thiocyanate salt.
Claim 5
Dependent Claim
13 words
The process of claim 2 wherein the quaternary ammonium nitrate is methyl-tricapryl-ammonium nitrate.
Claim 6
Dependent Claim
26 words
The process of claim 2 wherein the quaternary ammonium nitrate is formed in situ by contacting a quaternary ammonium salt with an easily soluble nitrate salt.
Claim 7
Dependent Claim
26 words
The process of claim 2 wherein the quaternary ammonium thiocyanate is formed in situ by contacting a quaternary ammonium salt with an easily soluble thiocyanate salt.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |