Patent US4308240A successfully refreshed from Google Patents.
US4308240A
Expired / Lapsed
US
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Recovery of cobalt and manganese from ash of residue from manufacture of trimellitic acid by acid extraction
Assignee: BP Corp North America Inc
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Filing: 1980-12-19
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Granted: 1981-12-29
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Expires: 2000-12-19
Abstract
Abstract Cobalt and manganese are recovered from incineration ash obtained by combustion of residue from the manufacture of trimellitic acid and its recovery as 4-carboxyphthalic anhydride and then the recovered cobalt is separated from the recovered manganese by magnetic separation. The foregoing is accomplished by extraction of the ash with an aqueous solution of hydrogen bromide or chloride, recovery of the extract solution, and the upward adjustment of its pH while adding powdered manganese to precipitate metallic cobalt for its separation by magnetic means.
Inventors
- 👤 Jon J. Harper
- 👤 Stephen J. Pietsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:05
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B23/0453; C22B23/0461; C22B23/0407; C22B23/0415; C22B23/0423; C22B23/0469; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
93 words
The recovery of cobalt and manganese from a cobalt and manganese-containing residue of the manufacture of trimellitic acid and the separation of recovered cobalt from recovered manganese which comprises incinerating said residue, collecting the ash of said incineration, mixing the ash with hydrochloric or hydrobromic acid to dissolve the metals in said ash, adjusting the pH of the resulting solution of metal chlorides or bromides to a pH of at least 5.5 to 6 and while adding powdered manganese to precipitate metallic cobalt, and collecting the precipitated metallic cobalt with a magnetic separator.
Claim 2
Dependent Claim
93 words
The recovery of cobalt and manganese from a cobalt and manganese-containing residue of the manufacture of trimellitic acid and the separation of recovered cobalt from recovered manganese which comprises incinerating said residue, collecting the ash of said incineration, mixing the ash with hydrochloric or hydrobromic acid to dissolve the metals in said ash, adjusting the pH of the resulting solution of metal chlorides or bromides to a pH of at least 5.5 to 6 and while adding powdered manganese to precipitate metallic cobalt, and collecting the precipitated metallic cobalt with a magnetic separator.
Claim 3
Dependent Claim
52 words
The method of claim 1 wherein the residue also contains iron and the solution of metal chlorides first has its pH adjusted to a pH of 3 to 4 to precipitate iron oxide and then has its pH adjusted to a pH of 5.5 to 6 after removing the iron oxide precipitate.
Claim 4
Dependent Claim
17 words
The method of claim 2 wherein the pH adjustments are made by the addition of ammonium hydroxide.
Claim 5
Dependent Claim
13 words
The method of claim 2 wherein the ash is dissolved in hydrochloric acid.
Claim 6
Dependent Claim
14 words
The method of claim 4 wherein the pH adjustments are made with ammonium hydroxide.
Claim 7
Dependent Claim
14 words
The method of claim 4 wherein the collected cobalt is dissolved with hydrobromic acid.
Claim 8
Dependent Claim
43 words
The method of claim 4 wherein the solution separated from metallic cobalt is mixed with ammonium carbonate to precipitate manganese carbonate, separating the manganese carbonate precipitate, and the manganese carbonate is mixed with aqueous acetic acid to dissolve the manganese as its acetate.
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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) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |