US3725039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of nickel concentrates from laterite ores
Assignee: Basic Inc
•
Filing: 1970-12-10
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Granted: 1973-04-03
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Expires: 1990-12-10
Abstract
Abstract A PROCESS IS DISCLOSED FOR THE RECOVERY OF NICKEL CONCENTRATES FROM LATERITE ORES BY SEGREGATION ROASTING WHEREIN THE ORE AFTER DRYING FOR REMOVAL OF AT LEAST PART OF THE FREE WATER IS MIXED WITH A CHLORIDIZING AGENT AND A CARBONACEOUS REDUCTAND, SUCH AS COAL OR COKE, BEFORE ROASTING. THIS MIXTURE IS HEATED TO TEMPERATURES OF 900* TO 1050*C. WHILE MAINTAINING A SLIGHTLY REDUCING ATMOSPHERE. PREFERRED CHLORIDIZING AGENT IS A MIXTURE OF SODIUM CHLORIDE AND CALCIUM OXIDE. THE RESULTING SINTER IS SUBJECTED TO SUITABLE CONCENTRATION FOR FINAL NICKEL RECOVERY.
Inventors
- 👤 T Jepsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:54
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/02; C22B23/021
Claims Analysis
Total Claims: 0
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References 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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |