US3780159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering manganese values from low grade oxidized manganese containing ores
Assignee: Diamond Shamrock Corp
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Filing: 1972-06-23
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Granted: 1973-12-18
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Expires: 1992-06-23
Abstract
Abstract MANGANESE VALUES ARE RECOVERED FROM LOW GRADE OXIDIZED MANGANESE CONTAINING ORE BY CONTACTING AND LEACHING THE ORE WITH A SOLUTION PREPARED BY DISSOLVING AND DISPERSING NITROGEN DIOXIDE IN AN AQUEOUS MEDIUM AND RECOVERING AN IMPURE AQUEOUS MANGANESE NITRATE SOLUTION. IMPURITIES ARE REMOVED FROM THE NITRATE SOLUTION BY TREATMENT WITH AN ALKALINE AGENT AND HEAT AND THE TREATED SOLUTION IS HEATED TO DECOMPOSITION TEMPERATURES WHEREBY SUBSTANTIALLY PURE MANGANESE DIOXIDE, NITROGEN DIOXIDE AND WATER VAPOR ARE FORMED. THE NITROGEN DIOXIDE AND WATER VAPOR FORMED BY DECOMPOSITION CAN BE RECYCLED TO DISSOLVE AND DISPERSE SAID MATERIALS IN THE AQUEOUS MEDIUM.
Inventors
- 👤 J Welsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:21
CPC Classifications
C; C22; C22B; C22B47/00; C01; C01G; C01G45/00; C01G45/02; C01G45/024; C01G45/08; C01P; C01P2006/00; C01P2006/20; C01P2006/80
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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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |