Patent US4312838A successfully refreshed from Google Patents.
US4312838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange resins of high loading capacity, high chloride tolerance and rapid elution for uranium recovery
Assignee: Mobil Oil AS
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Filing: 1979-08-27
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Granted: 1982-01-26
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Expires: 1999-08-27
Abstract
Abstract Ion exchange process for the recovery of uranium from a pregnant carbonate lixiviant employed in uranium leaching operations in which the lixiviant is passed over a precipitation inducing anionic ion exchange resin under conditions to load the resin predominantly with non-exchangeable uranium. Non-exchangeable uranium is then recovered from the resin by eluting the resin with an aqueous acid solution having a pH no greater than 2. The process is useful in those applications in which the lixiviant contains chloride ions which inhibit the adsorption of uranyl ions.
Inventors
- 👤 Tsoung-Yuan Yan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:31
CPC Classifications
C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252; C22B60/0265
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
A method for the recovery of uranium from a carbonate lixiviant, comprising the steps of: passing said lixiviant over a type I or type II anionic ion exchange resin to cause said resin to retain uranium predominantly in the form of a precipitate, and recovering said precipitated uranium from said resin by contacting said resin with an aqueous acid solution having a pH no greater than 2.
Claim 2
Independent Claim
67 words
A method for the recovery of uranium from a carbonate lixiviant, comprising the steps of: passing said lixiviant over a type I or type II anionic ion exchange resin to cause said resin to retain uranium predominantly in the form of a precipitate, and recovering said precipitated uranium from said resin by contacting said resin with an aqueous acid solution having a pH no greater than 2.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein said lixiviant has a pH within the range of 5 to 7.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein said lixiviant contains chloride ions which inhibit the adsorption of uranyl ions.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein said lixiviant contains bicarbonate ions in a concentration of at least 0.05 weight percent.
Claim 6
Independent Claim
58 words
A method for the recovery of uranium from a carbonate lixiviant, comprising the steps of: passing said lixiviant over a type I or type II anionic ion exchange resin to cause said resin to retain uranium predominantly in the form of a precipitate, and recovering said precipitated uranium from said resin by leaching with a strong acid solution.
Claim 7
Independent Claim
58 words
A method for the recovery of uranium from a carbonate lixiviant, comprising the steps of: passing said lixiviant over a type I or type II anionic ion exchange resin to cause said resin to retain uranium predominantly in the form of a precipitate, and recovering said precipitated uranium from said resin by leaching with a strong acid solution.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |