Patent US4411873A successfully refreshed from Google Patents.
US4411873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In-line regeneration of polythionate poisoned ion exchange resins
Assignee: Mobil Oil AS
•
Filing: 1981-06-04
•
Granted: 1983-10-25
•
Expires: 2001-06-04
Abstract
Abstract A process is described for minimizing accumulation of undesirable polythionates on an ion exchange resin used to recover uranium values from a leachate from an in situ mining operation by adding sulfite, either as a sulfite salt or as SO 2 , directly to the leachate or to the eluant.
Inventors
- 👤 Tsoung-Yuan Yan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:45
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/28; B; B01; B01J; B01J49/00; B01J49/60; C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252; C22B60/0265
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
57 words
In a process for recovering uranium values from a uranium-containing ore which also contains sulfides comprising leaching said ore to form uranyl complexes and by-product polythionates, passing the leachate over an anion exchange resin, and eluting uranium from said resin, the improvement comprising adding sulfite directly to said leachate or eluant before being passed over said resin.
Claim 2
Dependent Claim
57 words
In a process for recovering uranium values from a uranium-containing ore which also contains sulfides comprising leaching said ore to form uranyl complexes and by-product polythionates, passing the leachate over an anion exchange resin, and eluting uranium from said resin, the improvement comprising adding sulfite directly to said leachate or eluant before being passed over said resin.
Claim 3
Dependent Claim
16 words
A process as defined in claim 1, wherein an approximately stoichiometric amount of sulfite is added.
Claim 4
Dependent Claim
23 words
A process as defined in claim 1 or 2, wherein said sulfite is added as a sulfite salt or as SO 2 .
References Cited (Backward Citations)
US2315534A
Cited
US2776258A
Cited
GB910025A
Cited
GB1115797A
Cited
US3458440A
Cited
US3692670A
Cited
US4296075A
Cited
US4298578A
Cited
US4214791A
Cited
US4312838A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |