US3673062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrowinning of metal
Assignee: NEW NCHANGA CONSOLIDATED COPPE
•
Filing: 1971-02-08
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Granted: 1972-06-27
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Expires: 1991-02-08
Abstract
Abstract The invention deals with a process in which an electrolyte for the cathodic deposition of cobalt is made up by dissolving a precipitated cobalt hydroxide resulting from precipitation by lime. The advance electrolyte is passed through a bed of activated carbon so that sulphide, which has been traced to impurities in the lime, and other contaminants are removed.
Inventors
- 👤 George Armstrong Smith
- 👤 Donald Simon Macleod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:17
CPC Classifications
C; C25; C25C; C25C1/00; C25C1/06; C25C1/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
20 words
The process claimed in claim 1 in which the advance electrolyte is passed through a bed of granular activated carbon.
Claim 2
Dependent Claim
18 words
The process claimed in claim 1 in which the carbon has been activated by treatment with sulphuric acid.
Claim 3
Dependent Claim
18 words
The process claimed in claim 1 in which spent activated carbon is reactivated by means of sulphuric acid.
Claim 4
Dependent Claim
61 words
A process for the electrowinning of cobalt in which a hydroxide of cobalt is obtained by precipitation with lime, the hydroxide is dissolved in the spend electrolyte from the electrowinning process to provide advance electrolyte is after filtration passed through electrolytic cells in which cobalt is deposited on cathodes, characterized by the step of contacting the advance electrolyte with activated carbon.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |