US2805939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating iron bearing ores
Assignee: Chemical Construction Corp
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Filing: 1954-08-16
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Granted: 1957-09-10
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Expires: 1974-08-16
Abstract
No abstract record available.
Inventors
- 👤 Felix A Schaufelberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:05
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/20; C22B3/22; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN TREATING AN OXIDIZED, NON-SULFIDE ORE, CONTAINING FERROUS AND NON-FERROUS MINERALS BY LEACHING AN AQUEOUS SLURRY OF SAID ORE IN THE PRESENCE OF AN EXCESS OF SULFURIC ACID OVER THE STOICHIOMETRIC REQUIREMENTS, SEPARATING RESULTANT LEACH LIQUOR FROM RESIDUAL SOLIDS, AND SUBJECTING SEPARATED LIQUOR TO HEAT AND PRESSURE TO PRECIPITATE IRONBEARING SOLIDS; THE IMPROVEMENT WHICH COMPRISES, DILUTING THE SEPARATED LIQUOR WITH SUFFICIENT WATER TO PRODUCE A SULFATE ION CONCENTRATION OF LESS THAN ABOUT 75 GRAMS PER LITER, HEATING SAID DILUTED LIQUOR IN A CLOSED VESSEL TO A TEMPERATURE ABOVE ABOUT 150*C. AND TO A PRESSURE ABOVE ATMOSPHERIC PRESSURE, WHEREBY A MAJOR PORTION OF THE DISSOLVED IRON IS CAUSED TO PRECIPITATE AS FERRIC OXIDE SUBSTANTIALLY FREE FROM SULFATE RADICALS AND COLLECTING RESULTANT PRECIPITATE.
Claim 2
Dependent Claim
121 words
IN TREATING AN OXIDIZED, NON-SULFIDE ORE, CONTAINING FERROUS AND NON-FERROUS MINERALS BY LEACHING AN AQUEOUS SLURRY OF SAID ORE IN THE PRESENCE OF AN EXCESS OF SULFURIC ACID OVER THE STOICHIOMETRIC REQUIREMENTS, SEPARATING RESULTANT LEACH LIQUOR FROM RESIDUAL SOLIDS, AND SUBJECTING SEPARATED LIQUOR TO HEAT AND PRESSURE TO PRECIPITATE IRONBEARING SOLIDS; THE IMPROVEMENT WHICH COMPRISES, DILUTING THE SEPARATED LIQUOR WITH SUFFICIENT WATER TO PRODUCE A SULFATE ION CONCENTRATION OF LESS THAN ABOUT 75 GRAMS PER LITER, HEATING SAID DILUTED LIQUOR IN A CLOSED VESSEL TO A TEMPERATURE ABOVE ABOUT 150*C. AND TO A PRESSURE ABOVE ATMOSPHERIC PRESSURE, WHEREBY A MAJOR PORTION OF THE DISSOLVED IRON IS CAUSED TO PRECIPITATE AS FERRIC OXIDE SUBSTANTIALLY FREE FROM SULFATE RADICALS AND COLLECTING RESULTANT PRECIPITATE.
References Cited (Backward Citations)
US981451A
Cited
US1503229A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-09 | 1961-03-11 | 1961-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-09 | 1965-03-11 | 1965-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-09 | 1969-03-11 | 1969-09-10 | $7700.00 | Window Closed / Lapsed |