Roasting of copper sulfide concentrates combined with solid state segregation reduction to recover copper
Abstract
Abstract A METHOD OF UPGRADING COPPER RECOVERY FROM COPPERIRON SULFIDE ORE CONTAINING UP TO ABOUT 5% COPPER IS PROVIDED COMPRISING FORMING A SULFIDE CONCENTRATE CONTAINING AT LEAST ABOUT 15% COPPER FROM SAID ORE, DEAD ROASTING THE SULFIDE CONCENTRATE TO PRODUCE A CALCINED CONCENTRATE IN WHICH THE SULFUR DOES NOT EXCEED ABOUT 1%, PREFERABLY DOES NOT EXCEED ABOUT 0.5% SULFUR, SUBJECTING THE CALCINED CONCENTRATE TO A CONTROLLED-REDUCTION ROAST AT AN ELEVATED REDUCTION TEMPERATURE WITH A REDUCING AGENT IN THE PRESENCE OF AN ALKALI METAL HALIDE, PREFERABLY A CHLORIDE SUCH AS NAC1, WHEREBY COPPER OXIDE IS SELECTIVELY REDUCED, LEAVING THE IRON SUBSTANTIALLY ALL IN THE IRON OXIDE FORM, THE REDUCED COPPER METAL BEING IN A FORM RECOVERABLE BY CONVENTIONAL SEPARATION PROCEDURES, SUCH AS MECHANICAL OR CHEMICAL METHODS.
Inventors
- 👤 W Opie
- 👤 L Coffin
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |