Patent US4207294A successfully refreshed from Google Patents.
US4207294A
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US
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Process for recovering uranium from wet-process phosphoric acid
Assignee: Doryokuro Kakunenryo Kaihatsu Jigyodan
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Filing: 1978-04-10
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Granted: 1980-06-10
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Expires: 1998-04-10
Abstract
Abstract A process for recovering uranium from a wet-process phosphoric acid crude solution is provided in which the phosphoric acid crude solution is contacted with an organic extractant consisting of octylphenyl phosphoric acid, di(2-ethylhexyl)phosphoric acid and trioctylphosphine oxide dissolved in an organic diluent to extract uranium from the phosphoric acid crude solution. The thus uranium loaded organic extractant is then contacted with mixed acid consisting of hydrofluoric acid and sulfuric acid, or alternatively with concentrated phosphoric acid to back-extract the uranium from the organic extractant.
Inventors
- 👤 Shuichiro Hirono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:02
CPC Classifications
C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252; C22B60/026; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234; C01B25/237; C01B25/238
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A process for recovering uranium from a wet-process phosphoric acid crude solution produced by the acid-treatment of uncalcined phosphate rock which comprises contacting the phosphoric acid crude solution with an organic extractant consisting of octylphenyl phosphoric acid, di(2-ethylhexyl)phosphoric acid and trioctylphosphine oxide dissolved in an organic diluent to extract uranium from the phosphoric acid crude solution, and then contacting the thus uranium loaded organic extractant with mixed acid consisting of hydrofluoric acid and sulfuric acid to back-extract the uranium as uranium fluoride precipitate from the organic extractant.
Claim 2
Dependent Claim
87 words
A process for recovering uranium from a wet-process phosphoric acid crude solution produced by the acid-treatment of uncalcined phosphate rock which comprises contacting the phosphoric acid crude solution with an organic extractant consisting of octylphenyl phosphoric acid, di(2-ethylhexyl)phosphoric acid and trioctylphosphine oxide dissolved in an organic diluent to extract uranium from the phosphoric acid crude solution, and then contacting the thus uranium loaded organic extractant with mixed acid consisting of hydrofluoric acid and sulfuric acid to back-extract the uranium as uranium fluoride precipitate from the organic extractant.
Claim 3
Dependent Claim
29 words
The process according to claim 1, wherein the organic extractant consists of 0.3 M octylphenyl phosphoric acid, 0.2 M di(2-ethylhexyl)phosphoric acid and 0.03 M trioctylphosphine oxide dissolved in kerosene.
Claim 4
Dependent Claim
21 words
The process according to claim 1, wherein the mixed acid consists of 5 M hydrofluoric acid and 3 M sulfuric acid.
Claim 5
Dependent Claim
77 words
A process for recovering uranium from a wet-process phosphoric acid crude solution produced by the acid-treatment of uncalcined phosphate rock which comprises contacting the phosphoric acid crude solution with an organic extractant consisting of octylphenyl phosphoric acid, di(2-ethylhexyl)phosphoric acid and trioctylphosphine oxide dissolved in an organic diluent to extract uranium from the phosphoric acid crude solution, and then contacting the thus uranium loaded organic extractant with concentrated phosphoric acid to back-extract the uranium from the organic extractant.
Claim 6
Dependent Claim
77 words
A process for recovering uranium from a wet-process phosphoric acid crude solution produced by the acid-treatment of uncalcined phosphate rock which comprises contacting the phosphoric acid crude solution with an organic extractant consisting of octylphenyl phosphoric acid, di(2-ethylhexyl)phosphoric acid and trioctylphosphine oxide dissolved in an organic diluent to extract uranium from the phosphoric acid crude solution, and then contacting the thus uranium loaded organic extractant with concentrated phosphoric acid to back-extract the uranium from the organic extractant.
Claim 7
Dependent Claim
29 words
The process according to claim 4, wherein the organic extractant consists of 0.3 M octylphenyl phosphoric acid, 0.2 M di(2-ethylhexyl)phosphoric acid and 0.03 M trioctylphosphine oxide dissolved in kerosene.
Claim 8
Dependent Claim
22 words
The process according to claim 4, wherein the concentrated phosphoric acid has a concentration of 71% as P 2 O 5 .
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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) | 1983-06-10 | 1983-12-10 | 1984-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-10 | 1987-12-10 | 1988-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-10 | 1991-12-10 | 1992-06-10 | $7700.00 | Window Closed / Lapsed |