Patent US4233272A successfully refreshed from Google Patents.
US4233272A
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Process for selective separation of uranium from solutions by means of an ion exchanger
Assignee: Uranerzbergbau GmbH
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Filing: 1977-06-14
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Granted: 1980-11-11
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Expires: 1997-06-14
Abstract
Abstract A process for selectively removing tetravalent and/or hexavalent uranium ions from a solution by using a chelate-forming cation exchanger. The solution may be prepared by contacting uranium bearing ore with either an acid or a dilute carbonate or bicarbonate solution. To facilitate removal of the uranium ions, the solution may have a pH value greater than 1.0 and a redox potential of from -50 to +250 mV.
Inventors
- 👤 Nahit Eresen
- 👤 Klaus Schroer
- 👤 Hans J. Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:21
CPC Classifications
C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252; C22B60/0265; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A process for obtaining uranium from an ore containing uranium and arsenic comprising: (a) contacting the ore with an acid under oxidizing conditions to thereby form a pregnant liquor containing uranium and arsenate; (b) contacting the pregnant liquor with hydrogen sulfide to precipitate arsenic sulfide; (c) in the absence of an oxidizing step, contacting the hydrogen sulfide treated liquor with a chelate-forming cation exchanger; and (d) recovering uranium from the chelate-forming cation exchanger.
Claim 2
Dependent Claim
73 words
A process for obtaining uranium from an ore containing uranium and arsenic comprising: (a) contacting the ore with an acid under oxidizing conditions to thereby form a pregnant liquor containing uranium and arsenate; (b) contacting the pregnant liquor with hydrogen sulfide to precipitate arsenic sulfide; (c) in the absence of an oxidizing step, contacting the hydrogen sulfide treated liquor with a chelate-forming cation exchanger; and (d) recovering uranium from the chelate-forming cation exchanger.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the liquor has a pH value greater than 1.0 and a redox potential of from -50 to 250 mV.
Claim 4
Dependent Claim
30 words
The process of claim 18 wherein the arsenic sulfide is precipitated at a pressure of from 1 to 4 bar and at a temperature of approximately 50° to 100° C.
Claim 5
Dependent Claim
31 words
The process of claim 3 wherein the uranium is recovered from the chelate-forming cation exchanger by eluting the exchanger with 5-15 percent sulfuric acid and precipitating the uranium from the eluate.
Claim 6
Dependent Claim
89 words
A process for obtaining uranium from an ore containing uranium and a material selected from the group consisting of arsenic, copper, molybdenum and lead comprising: (a) contacting the ore with an acid under oxidizing conditions to thereby form a pregnant liquor containing uranium and the material; (b) contacting the pregnant liquor with hydrogen sulfide to precipitate a sulfide of the material; (c) in the absence of an oxidizing step, contacting the hydrogen sulfide treated liquor with a chelate-forming cation exchanger; and (d) recovering uranium from the chelate-forming cation exchanger.
Claim 7
Dependent Claim
89 words
A process for obtaining uranium from an ore containing uranium and a material selected from the group consisting of arsenic, copper, molybdenum and lead comprising: (a) contacting the ore with an acid under oxidizing conditions to thereby form a pregnant liquor containing uranium and the material; (b) contacting the pregnant liquor with hydrogen sulfide to precipitate a sulfide of the material; (c) in the absence of an oxidizing step, contacting the hydrogen sulfide treated liquor with a chelate-forming cation exchanger; and (d) recovering uranium from the chelate-forming cation exchanger.
Claim 8
Dependent Claim
25 words
The process of claim 1 wherein the liquor has a pH value greater than 1.0 and a redox potential of from -50 to 250 mV.
Claim 9
Dependent Claim
32 words
The process of claim 2 wherein the sulfide of the material is precipitated at a pressure of from 1 to 4 bar and at a temperature of approximately 50° to 100° C.
Claim 10
Dependent Claim
31 words
The process of claim 3 wherein the uranium is recovered from the chelate-forming cation exchanger by eluting the exchanger with 5-15 percent sulfuric acid and precipitating the uranium from the eluate.
References Cited (Backward Citations)
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US3953568A
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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) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |