Patent US3920788A successfully refreshed from Google Patents.
US3920788A
Expired / Lapsed
US
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Preparation of uranium compounds
Assignee: Pechiney SA
•
Filing: 1972-09-25
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Granted: 1975-11-18
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Expires: 1992-09-25
Abstract
Abstract A method for the production of uranium compounds in a high state of purity comprising the steps of contacting a uranium bearing material with aqueous sulphuric acid, adjusting the ratio of water and sulphuric acid in the resulting leach solution to within the range of 0.16 to 0.26 to precipitate impurities from the first leach solution, diluting a second leach solution after removal of the precipitate formed to adjust the ratio of water and sulphuric acid to within the range of 0.35 to 0.50.
Inventors
- 👤 Henri Mercier
- 👤 Robert Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:39
CPC Classifications
C; C01; C01G; C01G43/00; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0221; C22B60/0226; C22B60/0234; C22B60/0252; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
A METHOD FOR THE PRODUCTION OF URANIUM COMPOUNDS IN A HIGH STATE OF PURITY, COMPRISING THE STEPS OF CONTACTING A URANIUM-BEARING MATERIAL WITH AN AQEUOUS SOLUTION OF SULFURIC ACID, SEPARATING UNDISSOLVED SOLIDS TO LEAVE A FIRST LEACH SOLUTION, ADJUSTING THE RATIO OF WATER TO FREE SULFURIC ACID IN THE FIRST LEACH SOLUTION TO WITHIN THE RANGE OF 0.16 TO 0.26 TO PRECIPITATE IMPURITIES FROM THE FIRST LEACH SOLUTIONS, REMOVING
Claim 2
Independent Claim
69 words
A METHOD FOR THE PRODUCTION OF URANIUM COMPOUNDS IN A HIGH STATE OF PURITY, COMPRISING THE STEPS OF CONTACTING A URANIUM-BEARING MATERIAL WITH AN AQEUOUS SOLUTION OF SULFURIC ACID, SEPARATING UNDISSOLVED SOLIDS TO LEAVE A FIRST LEACH SOLUTION, ADJUSTING THE RATIO OF WATER TO FREE SULFURIC ACID IN THE FIRST LEACH SOLUTION TO WITHIN THE RANGE OF 0.16 TO 0.26 TO PRECIPITATE IMPURITIES FROM THE FIRST LEACH SOLUTIONS, REMOVING
Claim 3
Dependent Claim
35 words
A method according to claim 1 wherein the ratio of the first leach solution is brought to the selected value by evaporation of water at a temperature of from 210*C. to 240*C. at atmospheric pressure.
Claim 4
Dependent Claim
24 words
A method according to claim 1 wherein the ratio of the first leach solution is brought to a value of from 0.18 to 0.20.
Claim 5
Dependent Claim
24 words
A method according to claim 1 wherein the second leach solution is diluted to a value of the ratio of from 0.43 to 0.47.
Claim 6
Dependent Claim
42 words
A method according to claim 1 wherein the uranium-bearing material is a concentrate titrating more than 0.05% of Ca with respect to uranium, and the aqueous solution of sulfuric acid used has a ratio of water to free acid higher than 0.5.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |