US3099526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of earth acids from slag
Assignee: Wah Chang Corp
•
Filing: 1961-08-09
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Granted: 1963-07-30
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Expires: 1981-08-09
Abstract
No abstract record available.
Inventors
- 👤 John C Li
- 👤 Robert E Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:05
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/04; C01; C01G; C01G33/00; C01G35/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S292/00; Y10S292/23
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
THE METHOD OF RECOVERING VALUES FROM A SILICEOUS SLAG HAVING: AN SIO2 CONTENT IN THE RANGE OF ABOUT 10 TO 40% BY WEIGHT; IMPURITIES, INCLUDING WATER-INSOLUBLE CALCIUM-CONTAINING COMPOUNDS; AND, AT LEAST ONE OF THE ELEMENTS COLUMBIUM AND TANTALUM, WHICH COMPRISES: GRINDING THE SLAG TO A RELATIVELY FINE MESH; TREATING THE GROUND SLAG WITH A WATER SOLUTION OF AT LEAST 10% CONCENTRATION OF AN ALKALI METAL HYDROXIDE AT ELEVATED TEMPERATURES SUBSTANTIALLY ABOVE THE ATMOSPHERIC BOILING POINT OF THE ALKALI HYDROXIDE SOLUTION UNDER PRESSURE OF AT LEAST 35 P.S.I.G. TO OPEN THE SLAG AND TO RENDER MORE ACCESSIBLE CALCIUM-CONTAINING AND OTHER IMPURITIES CONTAINED THEREIN FOR FURTHER TREATMENT FOR REMOVAL OF SUCH IMPURITIES; SEPARATING THE ALKALI METAL HYDROXIDE LIQUOR FROM THE SLAG SOLIDS; ACIDIFYING THE SOLIDS WITH A MINERAL ACID CAPABLE OF SOLUBILIZING METAL RADICALS OF THE INSOLUBLE IMPURITIES, INCLUDING CALCIUM OF THE CALCIUM-CONTAINING IMPURITIES, TO CONVERT THE CALCIUM-CONTAINING AND OTHER WATER INSOLU-
Claim 2
Independent Claim
150 words
THE METHOD OF RECOVERING VALUES FROM A SILICEOUS SLAG HAVING: AN SIO2 CONTENT IN THE RANGE OF ABOUT 10 TO 40% BY WEIGHT; IMPURITIES, INCLUDING WATER-INSOLUBLE CALCIUM-CONTAINING COMPOUNDS; AND, AT LEAST ONE OF THE ELEMENTS COLUMBIUM AND TANTALUM, WHICH COMPRISES: GRINDING THE SLAG TO A RELATIVELY FINE MESH; TREATING THE GROUND SLAG WITH A WATER SOLUTION OF AT LEAST 10% CONCENTRATION OF AN ALKALI METAL HYDROXIDE AT ELEVATED TEMPERATURES SUBSTANTIALLY ABOVE THE ATMOSPHERIC BOILING POINT OF THE ALKALI HYDROXIDE SOLUTION UNDER PRESSURE OF AT LEAST 35 P.S.I.G. TO OPEN THE SLAG AND TO RENDER MORE ACCESSIBLE CALCIUM-CONTAINING AND OTHER IMPURITIES CONTAINED THEREIN FOR FURTHER TREATMENT FOR REMOVAL OF SUCH IMPURITIES; SEPARATING THE ALKALI METAL HYDROXIDE LIQUOR FROM THE SLAG SOLIDS; ACIDIFYING THE SOLIDS WITH A MINERAL ACID CAPABLE OF SOLUBILIZING METAL RADICALS OF THE INSOLUBLE IMPURITIES, INCLUDING CALCIUM OF THE CALCIUM-CONTAINING IMPURITIES, TO CONVERT THE CALCIUM-CONTAINING AND OTHER WATER INSOLU-
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) | 1966-07-29 | 1967-01-28 | 1967-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-29 | 1971-01-28 | 1971-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-29 | 1975-01-28 | 1975-07-30 | $7700.00 | Window Closed / Lapsed |