Patent US4946019A successfully refreshed from Google Patents.
US4425307A
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US
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Hydrogen peroxide in sulfuric acid extraction of uranium ores
Assignee: EIDP Inc
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Filing: 1981-04-22
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Granted: 1984-01-10
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Expires: 2001-04-22
Abstract
Abstract Uranium can be extracted from its ores at a pH of 2.5 to 5.5 using sulfuric acid, hydrogen peroxide, trace of iron and a sulfate. The extraction process is applicable to both tank leaching of conventionally mined ores and in situ leaching.
Inventors
- 👤 Frederick W. DeVries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:54
CPC Classifications
C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0221; C22B60/0226; C22B60/0234; E; E21; E21B; E21B43/00; E21B43/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
73 words
In a process for the extraction of uranium from its ores with a leach solution wherein the uranium is oxidized to uranium (VI) oxidation state and then extracted, the improvement which comprises extracting the uranium in the absence of ferric ion at a pH of 2.5 to 5.5 with sulfuric acid, hydrogen peroxide, a trace of ferrous iron and between 0.1 and 1.6 mols of a neutral sulfate per mol of leach solution.
Claim 2
Dependent Claim
73 words
In a process for the extraction of uranium from its ores with a leach solution wherein the uranium is oxidized to uranium (VI) oxidation state and then extracted, the improvement which comprises extracting the uranium in the absence of ferric ion at a pH of 2.5 to 5.5 with sulfuric acid, hydrogen peroxide, a trace of ferrous iron and between 0.1 and 1.6 mols of a neutral sulfate per mol of leach solution.
Claim 3
Dependent Claim
83 words
In a process for the solution mining of a uranium ore deposit where an aqueous leaching solution is passed through the ore deposit to dissolve the uranium is withdrawn from the ore deposit, the improvement comprising: passing through the deposit an aqueous leaching solution containing sulfuric acid, hydrogen peroxide, and between 0.1 and 1.6 mols of a neutral sulfate per mol of leach solution at a pH of 2.5 to 5.5 in the presence of ferrous iron and the absence of ferric ion.
Claim 4
Dependent Claim
83 words
In a process for the solution mining of a uranium ore deposit where an aqueous leaching solution is passed through the ore deposit to dissolve the uranium is withdrawn from the ore deposit, the improvement comprising: passing through the deposit an aqueous leaching solution containing sulfuric acid, hydrogen peroxide, and between 0.1 and 1.6 mols of a neutral sulfate per mol of leach solution at a pH of 2.5 to 5.5 in the presence of ferrous iron and the absence of ferric ion.
Claim 5
Dependent Claim
13 words
A process of claim 1 or 2 wherein the sulfate is sodium sulfate.
Claim 6
Dependent Claim
23 words
A process of claim 1 or 2 wherein the concentration of the sulfate is 0.5 to 1.6 molar based on the leach solution.
Claim 7
Dependent Claim
23 words
A process of claim 1 or 2 wherein the concentration of the sulfate is 0.8 to 1.2 molar based on the leach solution.
References Cited (Backward Citations)
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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) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |