Patent US3441401A successfully refreshed from Google Patents.
US3441401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing fatty acid coating from hematite concentrate
Assignee: Bethlehem Steel Corp
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Filing: 1966-10-26
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Granted: 1969-04-29
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Expires: 1986-10-26
Abstract
No abstract record available.
Inventors
- 👤 Rodney L Stone
- 👤 William M Aubrey Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:22
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A METHOD OF PRODUCING INDURATED PELLETS OF MAGNETITE-HEMATITE CONCENTRATE REVOVERED FROM A LOW GRADE MAGNETITE ORE CONTAINING HEMATITE, PYRITE, SILICA AND APATITE COMPRISING: (A) WET GRINDING THE ORE TO A FINENESS SUITABLE FOR MAGNETIC SEPARATION, (B) MAGNETICALLY SEPARATING THE MAGNETITE CONCENTRATE FROM THE SILICEOUS-BEARING HEMATITE, (C) ADDING AN ANIONIC FATTY ACID COLLECTOR TO THE SLURRY AND REMOVING THE HEMATITE CONCENTRATE AS A "FLOAT" PRODUCT FROM THE SILICEOUS GANGUE, (D) GRINDING THE HEMATITE CONCENTRATE SLURRY TO A FINENESS SUITABLE FOR PELLETIZING, (E) ADDING NOT LESS THAN 45 POUNDS OF LEONARDITE PER TON OF HEMATITE CONCENTRATE DURING THE GRINDING THEREOF, (F) MIXING THE RECOVERED MAGNETITE CONCENTRATE WITH THE LEONARDITE AND HEMATITE CONCENTRATE SLURRY, (G) FILTERING THE MAGNETITE CONCENTRATE-LEONARDITEHEMATITE CONCENTRATE SLURRY TO REMOVE SUBSTANTIALLY ALL THE LEONARDITE THEREFROM, (H) PELLETIZING THE MAGNETITE-HEMATITE CONCENTRATE, AND (I) INDURATING THE PELLETS.
Claim 2
Independent Claim
135 words
A METHOD OF PRODUCING INDURATED PELLETS OF MAGNETITE-HEMATITE CONCENTRATE REVOVERED FROM A LOW GRADE MAGNETITE ORE CONTAINING HEMATITE, PYRITE, SILICA AND APATITE COMPRISING: (A) WET GRINDING THE ORE TO A FINENESS SUITABLE FOR MAGNETIC SEPARATION, (B) MAGNETICALLY SEPARATING THE MAGNETITE CONCENTRATE FROM THE SILICEOUS-BEARING HEMATITE, (C) ADDING AN ANIONIC FATTY ACID COLLECTOR TO THE SLURRY AND REMOVING THE HEMATITE CONCENTRATE AS A "FLOAT" PRODUCT FROM THE SILICEOUS GANGUE, (D) GRINDING THE HEMATITE CONCENTRATE SLURRY TO A FINENESS SUITABLE FOR PELLETIZING, (E) ADDING NOT LESS THAN 45 POUNDS OF LEONARDITE PER TON OF HEMATITE CONCENTRATE DURING THE GRINDING THEREOF, (F) MIXING THE RECOVERED MAGNETITE CONCENTRATE WITH THE LEONARDITE AND HEMATITE CONCENTRATE SLURRY, (G) FILTERING THE MAGNETITE CONCENTRATE-LEONARDITEHEMATITE CONCENTRATE SLURRY TO REMOVE SUBSTANTIALLY ALL THE LEONARDITE THEREFROM, (H) PELLETIZING THE MAGNETITE-HEMATITE CONCENTRATE, AND (I) INDURATING THE PELLETS.
References Cited (Backward Citations)
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Cited
US2766883A
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FR1253093A
Cited
US3149958A
Cited
US3266887A
Cited
FR1374894A
Cited
US3331505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-28 | 1972-10-28 | 1973-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-28 | 1976-10-28 | 1977-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-28 | 1980-10-28 | 1981-04-29 | $7700.00 | Window Closed / Lapsed |