Patent US4320923A successfully refreshed from Google Patents.
US4320923A
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Method for solution mining of uranium ores
Assignee: EIDP Inc
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Filing: 1979-02-26
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Granted: 1982-03-23
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Expires: 1999-02-26
Abstract
Abstract In the solution mining of uranium ores using an aqueous ammonium carbonate leaching solution containing hydrogen peroxide and/or molecular oxygen as oxidant, permeability of the ore formation during the leaching operation is maintained or improved by including a small amount of alkali metal silicate dissolved in the leaching solution. The silicate also improves the stability of the oxidant in many instances.
Inventors
- 👤 Bernard C. Lawes
- 👤 John C. Watts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:39
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/28; C; C01; C01G; C01G43/00; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0221; C22B60/0247
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
In a process for the solution mining of a uranium ore formation where an aqueous carbonate leaching solution containing an oxidant is passed through the ore formation to dissolve uranium from the formation therein and the solution is withdrawn from the ore formation enriched in uranium, the improvement comprising preventing permeability loss by passing through the ore formation, which otherwise would thereby have a permeability loss, aqueous ammonium carbonate leaching solution having a pH of 7-10, and which has dissolved therein an oxidant selected from the group consisting of hydrogen peroxide, molecular oxygen and a mixture thereof and a small amount of alkali metal silicate effective to restore the permeability.
Claim 2
Dependent Claim
110 words
In a process for the solution mining of a uranium ore formation where an aqueous carbonate leaching solution containing an oxidant is passed through the ore formation to dissolve uranium from the formation therein and the solution is withdrawn from the ore formation enriched in uranium, the improvement comprising preventing permeability loss by passing through the ore formation, which otherwise would thereby have a permeability loss, aqueous ammonium carbonate leaching solution having a pH of 7-10, and which has dissolved therein an oxidant selected from the group consisting of hydrogen peroxide, molecular oxygen and a mixture thereof and a small amount of alkali metal silicate effective to restore the permeability.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the leaching solution contains 0.1-5 grams per liter of alkali metal silicate.
Claim 4
Dependent Claim
27 words
The process of claim 2 wherein the leaching solution contains 0.1-10 grams per liter of H 2 O 2 and 0.5-20 grams per liter of ammonium carbonates.
Claim 5
Dependent Claim
25 words
The process of claim 3 wherein the alkali metal silicate is sodium silicate present in the solution at a concentration of 0.5-1.5 grams per liter.
Claim 6
Dependent Claim
36 words
The process of claim 3 wherein the silicate-containing leaching solution is passed through the ore formation after a nonsilicate-contaning leaching solution has been passed through the ore formation resulting in reduced permeability of the ore formation.
References Cited (Backward Citations)
US3746646A
Cited
US3687627A
Cited
US3792903A
Cited
US3951594A
Cited
US3865435A
Cited
US4155982A
Cited
US3996151A
Cited
US4103963A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-22 | 1985-09-21 | 1986-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-22 | 1989-09-21 | 1990-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-22 | 1993-09-21 | 1994-03-23 | $7700.00 | Window Closed / Lapsed |