US3291398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beneficiation of magnetic iron ores
Assignee: Aerofall Mills Inc
•
Filing: 1964-02-03
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Granted: 1966-12-13
•
Expires: 1984-02-03
Abstract
No abstract record available.
Inventors
- 👤 Weston David
- 👤 Robert R Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:16
CPC Classifications
B; B03; B03C; B03C1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A METHOD OF BENEFICIATING MAGNETIC IRON ORES CONTAINING AGGREGATES OF SUBSTANTIALLY BARREN GANGU PARTICLES AND A NON-UNIFORM DISTRIBUTION OF AGGREGATES AND FREE INDIVIDUAL CRYSTALS OF THE MINERAL TO BE RECOVERED, SAID METHOD CONSISTING IN; PASSING THE ORE THROUGH A DRY COMMINUTION CIRCUIT, WHICH IS ADAPTED TO PRODUCE A SUBSTANTIAL PROPORTION OF PRODUCT IN A SIZE RANGE LARGER THAN THE PRIMARY CRYSTAL SIZE OF THE CONTAINED MINERAL; COLLECTING SEPARATELY ALL OF THE PORTION OF THE MILLING CIRCUIT PRODUCT WHICH IS PRIMARY OF A PARTICLE SIZE LARGER THAN THE PRIMARY CRYSTAL SIZE OF SAID ORE; SUBJECTING SAID COLLECTED PRODUCT TO DRY MAGNETIC CONCENTRATION TO PRODUCE A COARSE CONCENTRATE CONSISTING ESSENTIALLY OF AGGREGATES AND FREE INDIVIDUAL CRYSTALS OF THE MINERAL TO BE RECOVERED, A MIDDLING CONSISTING ESSENTIALLY OF AGGREGATES OF PRIMARY CRYSTALS OF MINERAL AND GANGUE AND A DISCARDABLE TAILING; AND RETURNING THE MIDDLING TO THE INLET SAID MILLING CIRCUIT.
Claim 2
Independent Claim
147 words
A METHOD OF BENEFICIATING MAGNETIC IRON ORES CONTAINING AGGREGATES OF SUBSTANTIALLY BARREN GANGU PARTICLES AND A NON-UNIFORM DISTRIBUTION OF AGGREGATES AND FREE INDIVIDUAL CRYSTALS OF THE MINERAL TO BE RECOVERED, SAID METHOD CONSISTING IN; PASSING THE ORE THROUGH A DRY COMMINUTION CIRCUIT, WHICH IS ADAPTED TO PRODUCE A SUBSTANTIAL PROPORTION OF PRODUCT IN A SIZE RANGE LARGER THAN THE PRIMARY CRYSTAL SIZE OF THE CONTAINED MINERAL; COLLECTING SEPARATELY ALL OF THE PORTION OF THE MILLING CIRCUIT PRODUCT WHICH IS PRIMARY OF A PARTICLE SIZE LARGER THAN THE PRIMARY CRYSTAL SIZE OF SAID ORE; SUBJECTING SAID COLLECTED PRODUCT TO DRY MAGNETIC CONCENTRATION TO PRODUCE A COARSE CONCENTRATE CONSISTING ESSENTIALLY OF AGGREGATES AND FREE INDIVIDUAL CRYSTALS OF THE MINERAL TO BE RECOVERED, A MIDDLING CONSISTING ESSENTIALLY OF AGGREGATES OF PRIMARY CRYSTALS OF MINERAL AND GANGUE AND A DISCARDABLE TAILING; AND RETURNING THE MIDDLING TO THE INLET SAID MILLING CIRCUIT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |