Patent US3684485A successfully refreshed from Google Patents.
US3684485A
Expired / Lapsed
US
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Process for treating minerals containing the feo group
Assignee: GEA Group AG
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Filing: 1971-02-16
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Granted: 1972-08-15
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Expires: 1991-02-16
Abstract
Abstract A PROCESS FOR TREATING A MINERAL, E.G, ILMENITE, CONTAINING FEO GROUPS TOGETHER WITH A HEAVY-METAL OXIDE (E.G, TIO2) WHEREIN THE MINERAL IS SOBJECTED TO A REDUCTION STEP TO TRANSFORM THE IRON OXIDE TO METALLIC IRON WHICH IS THEN LEACHED. FROM THE LIXIVIANT, IRON OXIDES AND/ OR HYDROXIDES ARE PRECIPITATED. THE PRECIPITATE IS AGGLOMERATED, E.G. INTO BRIQUETTES WITH A BINDER, THE AGGLOMERATE BEING RECYCLED TO THE REDUCING STAGE TO PRODUCE SPONGE IRON. THE MINERAL, AFTER LEACHING, CONSISTS OF A RESIDUE OF THE HEAVY-METAL OXIDE OF HIGH PURITY.
Inventors
- 👤 Kurt Meyer
- 👤 Gerhard Reuter
- 👤 Wilhelm Thumm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:40
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1204; C22B34/1213; C21; C21B; C21B13/00; C21B13/006; C21B15/00; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134; 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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |