Patent US3660073A successfully refreshed from Google Patents.
US3660073A
Expired / Lapsed
US
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Ore pelletizing aid
Assignee: ChampionX LLC
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Filing: 1969-05-21
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Granted: 1972-05-02
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Expires: 1989-05-21
Abstract
Abstract The invention relates to an organic ore pelletizing aid, to a method for making it, and to a method for pelletizing ore using the pelletizing aid. The pelletizing aid comprises coal which has been treated with an alkali metal hydroxide. A particular advantage is the provision of good ore ''''ballability,'''' even at relatively high moisture content. The pelletizing aid may be coated with a high molecular weight, water dispersible organic polymer to further improve its performance.
Inventors
- 👤 Roger W Youngs
- 👤 Joseph M Sandri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:14
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/242
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
12 words
The method as defined in claim 1 wherein said coal is lignite.
Claim 2
Dependent Claim
41 words
The method as defined in claim 1 wherein said alkali metal hydroxide is sodium hydroxide, and is present in an amount of about 12-18 percent, based on the dry weight of said coal and the dry weight of said sodium hydroxide.
Claim 3
Dependent Claim
78 words
In a method for pelletizing ore comprising pelletizing a wetted particulate mass of mineral ore to form integral pellet units, and firing said pellet units to a hardened state, the improvement comprising: incorporating into said wetted particulate mass a pelletizing aid, said pelletizing aid prepared by the method comprising contacting coal with an alkali metal hydroxide at temperatures of up to 100* C. and subsequently coating said coal with a water-dispersible organic polymer of relatively high molecular weight.
Claim 4
Dependent Claim
15 words
The method as defined in claim 4 wherein said polymer is an alkali metal polyacrylate.
Claim 5
Dependent Claim
21 words
The method as defined in claim 5 wherein said polymer has an average molecular weight of at least about 1 million.
Claim 6
Dependent Claim
13 words
The pelletizing aid as defined in claim 6 wherein said coal is lignite.
Claim 7
Dependent Claim
112 words
In a method for pelletizing ore comprising pelletizing a wetted particulate mass of mineral ore to form integral pellet units, and firing said pellet units to a hardened state, the improvement comprising: incorporating into said wetted particulate mass a pelletizing Aid, said pelletizing aid prepared by the method comprising contacting finely divided lignite coal with sodium hydroxide at temperatures of up to 100* C., said sodium hydroxide being present in an amount of about 12-18 percent based on the dry weight of said lignite coal and the dry weight of said sodium hydroxide, and subsequently coating said lignite coal with sodium polyacrylate having a molecular weight of at least about 1 million.
References Cited (Backward Citations)
US1923803A
Cited
US2894851A
Cited
US3214346A
Cited
US3180723A
Cited
US3418237A
Cited
US3387941A
Cited
US3393978A
Cited
US3304168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |