US2843456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating aluminous ores
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1953-04-27
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Granted: 1958-07-15
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Expires: 1973-04-27
Abstract
No abstract record available.
Inventors
- 👤 John L Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:37
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/16; C01; C01F; C01F7/00; C01F7/02; C01F7/04; C01F7/06; C01F7/0673
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN AN ALKALINE PROCESS FOR RECOVERING ALUMINA VALUES FROM ORES CONTAINING SAID ALUMINA VAUES PRINCIPALLY AS ALUMINUM PHOSPHATE AND SAID ORES ALSO CONTAINING APPRECIABLE AMOUNTS OF SILICIOUS MATERIAL, THE PROCESS OF EXTRACTING THE ALUMINUM PHOSPHATE VALUES FROM THE ORES WITHOUT EXCESSIVE LOSSES OF SODA AND ALUMINA THROUGH THE FORMATION OF INSOLUBLE SODIUM ALUMINUM SILICATE COMPLEXES WHICH COMPRISES DIGESTING SAID ORES IN SPENT CAUSTIC SODA SOLUTIONS TO EXTRACT SAID ALUMINUM PHOSPHATE AT TEMPERATURES BETWEEN ABOUT 80*C. AND THE ATMOSPHERIC BOILING POINT OF SAID SOLUTIONS, LIMITING CONTACT OF SAID ORES WITH SAID CAUSTIC SODA SOLUTIONS AT THE DIGESTION TEMPERATURES TO A PERIOD OF TIME NOT GREATER THAN 30 MINUTES, AND THEREAFTER SEPARATING THE RESIDUES FROM THE PREGNANT SOLUTIONS CONTAINING THE SOLUBILIZED ALUMINA AND PHOSPHATE VALUES.
Claim 2
Dependent Claim
123 words
IN AN ALKALINE PROCESS FOR RECOVERING ALUMINA VALUES FROM ORES CONTAINING SAID ALUMINA VAUES PRINCIPALLY AS ALUMINUM PHOSPHATE AND SAID ORES ALSO CONTAINING APPRECIABLE AMOUNTS OF SILICIOUS MATERIAL, THE PROCESS OF EXTRACTING THE ALUMINUM PHOSPHATE VALUES FROM THE ORES WITHOUT EXCESSIVE LOSSES OF SODA AND ALUMINA THROUGH THE FORMATION OF INSOLUBLE SODIUM ALUMINUM SILICATE COMPLEXES WHICH COMPRISES DIGESTING SAID ORES IN SPENT CAUSTIC SODA SOLUTIONS TO EXTRACT SAID ALUMINUM PHOSPHATE AT TEMPERATURES BETWEEN ABOUT 80*C. AND THE ATMOSPHERIC BOILING POINT OF SAID SOLUTIONS, LIMITING CONTACT OF SAID ORES WITH SAID CAUSTIC SODA SOLUTIONS AT THE DIGESTION TEMPERATURES TO A PERIOD OF TIME NOT GREATER THAN 30 MINUTES, AND THEREAFTER SEPARATING THE RESIDUES FROM THE PREGNANT SOLUTIONS CONTAINING THE SOLUBILIZED ALUMINA AND PHOSPHATE VALUES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |