US3744994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of separating copper from nickel
Assignee: Aurubis AG
•
Filing: 1970-12-30
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Granted: 1973-07-10
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Expires: 1990-12-30
Abstract
Abstract A PROCESS FOR RECOVERING COPPER AND NICKEL FROM COMPOSITIONS CONTAINING COPPER AND NICKEL IN THE PRESENCE OF SULFIDIC SULFUR IN WHICH THE COMPOSITION, WHICH MUST HAVE SULFUR IN AN AMOUNT OF AT LEAST 20% BY WEIGHT OF THE COPPER CONTENT OR WHICH CONTAINS AT LEAST 50% BY WEIGHT NICKEL, IS SLURRIED WITH SULFURIC ACID HAVING A H2SO4 CONCENTRATION OF 400-800 G./LITER, IS HEATED TO A TEMPERATURE OF 110* TO 120* C., AND IS PERMITTED TO STAND AT THIS TEMPERATURE UNTIL THE METAL (NICKEL) WHICH FORMS UNSTABLE SULFATES IN SULFURIC ACID ARE CONVERTED INTO SULFATES. THE SOLID AND LIQUID PHASE ARE THEN SEPARATED AND TREATED SEPARATELY FOR RECOVERY OF THE METAL.
Inventors
- 👤 K Emicke
- 👤 W Goralczyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:22
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B23/0407; C22B23/0415; C22B23/043; C22B3/00; C22B3/04; C22B3/06; C22B3/08; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
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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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |