US3273707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of low silica iron superconcentrates
Assignee: —
•
Filing: —
•
Granted: 1966-09-20
•
Expires: 1983-09-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:58
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; C; C22; C22B; C22B1/00; C22B1/02; C22B1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A METHOD OF PRODUCING IRON SUPERCONCENTRATES WHICH COMPRISES GRINDING AN ORE CONCENTRATE CONSISTING ESSENTIALLY OF SPECULAR HEMATITE HAVING A SILICA CONTENT OF MORE THAN 1%, TO A PARTICLE SIZE OF MINUS 100 TO MINUS 325 MESH, SUBJECTING SAID GROUND ORE BODY TO A FROTH FLOTATION TREATMENT WITH A CATIONIC COLLECTOR TO REMOVE SILICA THEREFROM AND PRODUCE A WET FLOTATION CONCENTRATE CONTAINING IN THE ORDER OF 0.10% SILICA, SUBJECTING SAID FLOTATION CONCENTRATE WHILE STILL WET TO A WET MAGNETIC SEPARATION TREATMENT IN A MAGNETIC FIELD HAVING AN INTENSITY IN THE RANGE OF 3000 TO 7000 GAUSS TO PRODUCE A MAGNETIC SEPARATION CONCENTRATE FROM SAID ONE BODY CONTAINING NOT SUBSTANTIALLY LESS THAN 99% IRON OXIDE AND NOT SUBSTANTIALLY MORE THAN 0.05% SILICA.
Claim 2
Independent Claim
120 words
A METHOD OF PRODUCING IRON SUPERCONCENTRATES WHICH COMPRISES GRINDING AN ORE CONCENTRATE CONSISTING ESSENTIALLY OF SPECULAR HEMATITE HAVING A SILICA CONTENT OF MORE THAN 1%, TO A PARTICLE SIZE OF MINUS 100 TO MINUS 325 MESH, SUBJECTING SAID GROUND ORE BODY TO A FROTH FLOTATION TREATMENT WITH A CATIONIC COLLECTOR TO REMOVE SILICA THEREFROM AND PRODUCE A WET FLOTATION CONCENTRATE CONTAINING IN THE ORDER OF 0.10% SILICA, SUBJECTING SAID FLOTATION CONCENTRATE WHILE STILL WET TO A WET MAGNETIC SEPARATION TREATMENT IN A MAGNETIC FIELD HAVING AN INTENSITY IN THE RANGE OF 3000 TO 7000 GAUSS TO PRODUCE A MAGNETIC SEPARATION CONCENTRATE FROM SAID ONE BODY CONTAINING NOT SUBSTANTIALLY LESS THAN 99% IRON OXIDE AND NOT SUBSTANTIALLY MORE THAN 0.05% SILICA.
References Cited (Backward Citations)
US2088364A
Cited
US2217684A
Cited
US2352324A
Cited
US2388471A
Cited
US2483890A
Cited
US3032189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |