Patent US2628154A successfully refreshed from Google Patents.
US2628154A
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Method of recovering chromates and vanadates from aqueous solution
Assignee: Diamond Shamrock Corp
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Filing: 1950-04-28
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Granted: 1953-02-10
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Expires: 1970-04-28
Abstract
No abstract record available.
Inventors
- 👤 Tom S Perrin
- 👤 Robert G Banner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:27
CPC Classifications
C; C01; C01G; C01G31/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
IN THE METHOD OF RECOVERING VANADATES FROM A PRECIPITATE CONTAINING LEAD VANADATE BY DECOMPOSING SAID PRECIPITATE WITH SULFURIC ACID AND RECOVERING THE VANADIUM VALUES OF SUCH PRECIPITATE AS A SALT OF HEXAMETAVANADIC ACID, THE IMPROVEMENT WHICH CONSISTS ESSENTIALLY IN LEACHING SAID PRECIPITATE WITH SULFURIC ACID OF A CONCENTRATION SUBSTANTIALLY WITHIN THE RANGE OF 34.5%42.5% AND AT A TEMPERATURE SUBSTANTIALLY WITHIN THE RANGE OF 25*-70* C., TO CONVERT SAID LEAD VANADATE TO VANADIC ACID AND PRECIPITATE LEAD SULFATE, SEPARATING THE SOLUTION OF VANADIC ACID FROM THE LEAD SULFATE, ADJUSTING THE PH OF THE SOLUTION TO A POINT WITHIN THE RANGE OF 1-3 WITH A BASE SELECTED FROM THE GROUP CONSISTING OF SODIUM AND AMMONIUM BASES, AND HEATING THE SOLUTION TO A TEMPERATURE WITHIN THE RANGE OF 80* C. TO THE BOILING POINT OF THE SOLUTION TO PRECIPITATE A SALT OF HEXAMETAVANADIC ACID.
Claim 2
Dependent Claim
141 words
IN THE METHOD OF RECOVERING VANADATES FROM A PRECIPITATE CONTAINING LEAD VANADATE BY DECOMPOSING SAID PRECIPITATE WITH SULFURIC ACID AND RECOVERING THE VANADIUM VALUES OF SUCH PRECIPITATE AS A SALT OF HEXAMETAVANADIC ACID, THE IMPROVEMENT WHICH CONSISTS ESSENTIALLY IN LEACHING SAID PRECIPITATE WITH SULFURIC ACID OF A CONCENTRATION SUBSTANTIALLY WITHIN THE RANGE OF 34.5%42.5% AND AT A TEMPERATURE SUBSTANTIALLY WITHIN THE RANGE OF 25*-70* C., TO CONVERT SAID LEAD VANADATE TO VANADIC ACID AND PRECIPITATE LEAD SULFATE, SEPARATING THE SOLUTION OF VANADIC ACID FROM THE LEAD SULFATE, ADJUSTING THE PH OF THE SOLUTION TO A POINT WITHIN THE RANGE OF 1-3 WITH A BASE SELECTED FROM THE GROUP CONSISTING OF SODIUM AND AMMONIUM BASES, AND HEATING THE SOLUTION TO A TEMPERATURE WITHIN THE RANGE OF 80* C. TO THE BOILING POINT OF THE SOLUTION TO PRECIPITATE A SALT OF HEXAMETAVANADIC ACID.
References Cited (Backward Citations)
US1065582A
Cited
US1784950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-10 | 1956-08-11 | 1957-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-10 | 1960-08-11 | 1961-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-10 | 1964-08-11 | 1965-02-10 | $7700.00 | Window Closed / Lapsed |