US4551315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovering vanadium values from ammonium bicarbonate solution
Assignee: Chevron USA Inc
•
Filing: 1984-11-26
•
Granted: 1985-11-05
•
Expires: 2004-11-26
Abstract
Abstract A method of recovering vanadium from an aqueous ammonium bicarbonate solvent strip solution is disclosed. The method includes adding sulfuric acid to the aqueous ammonium bicarbonate solution followed by addition of ammonia or ammonium hydroxide to precipitate out the vanadium.
Inventors
- 👤 Paul J. Marcantonio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:06
CPC Classifications
C; C01; C01G; C01G31/00; C01G31/003; C01G39/00; C01G39/003; C01G41/00; C01G41/003; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/28; C22B3/288; C22B34/00; C22B34/20; C22B34/22; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A method of recovering vanadium values from an aqueous ammonium bicarbonate solvent extraction strip solution comprising: (a) adding sulfuric acid to the aqueous ammonium bicarbonate strip solution containing vanadium values and adjusting the pH of the strip solution with said acid to a range of from 2 to 6; (b) removing CO 2 formed from the decomposition of ammonium bicarbonate from the solution; (c) adding ammonia or ammonium hydroxide or a mixture thereof to the strip solution in order to bring the pH of the strip solution in the range of from 6.5 to 8.5; and (d) separating the vanadium metal values from the strip solution.
Claim 2
Independent Claim
106 words
A method of recovering vanadium values from an aqueous ammonium bicarbonate solvent extraction strip solution comprising: (a) adding sulfuric acid to the aqueous ammonium bicarbonate strip solution containing vanadium values and adjusting the pH of the strip solution with said acid to a range of from 2 to 6; (b) removing CO 2 formed from the decomposition of ammonium bicarbonate from the solution; (c) adding ammonia or ammonium hydroxide or a mixture thereof to the strip solution in order to bring the pH of the strip solution in the range of from 6.5 to 8.5; and (d) separating the vanadium metal values from the strip solution.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the pH of the strip solution of step (a) is in the range of from 4 to 5.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein the pH of the strip solution of step (b) is in the range of from 7.0 to 7.5.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein the temperature of step (c) is in the range of from 20° to 30° C.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein ammonium metavanadate seed crystals are added after step (c) in order to facilitate vanadium precipitation.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein the CO 2 concentration of step (b) in the solution is less than 2000 ppm.
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) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |