US2980497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of lithium from lithium aluminate complex
Assignee: Dow Chemical Co
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Filing: 1957-01-29
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Granted: 1961-04-18
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Expires: 1977-01-29
Abstract
No abstract record available.
Inventors
- 👤 Robert D Goodenough
- 👤 Vernon A Stenger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:20
CPC Classifications
C; C01; C01D; C01D15/00; C01D15/02; C22; C22B; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A PROCESS FOR THE RECOVERY OF LITHIUM FROM A LITHIUM ALUMINATE COMPLEX PRECIPIATED FROM A CHLORIDE BRINE AND CONTAINING AS IMPURITIES CALCIUM, MAGNESIUM, ALUMINUM AND FERRIC IONS, WHICH COMPRISES HEATING THE LITHIUM ALUMINATE COMPLEX TO A TEMPERATURE OF AT LEAST 75*C. IN THE PRESENCE OF LIQUID WATER TO DECOMPOSE THE LITHIUM ALUMINATE COMPLEX TO ALUMINUM HYDROXIDE, AND A SOLUBLE LITHIUM COMPOUND WHICH DISSOLVES IN THE WATER WITH THE IMPURITIES CONTACTING THE RESULTING LITHIUM CONTAINING SOLUTION WITH A STRONGLY ACIDIC CATION EXCHANGE RESIN TO THEREBY BIND THE LITHIUM AND THE IMPURITIES TO THE RESIN, SUBSEQUENTLY CONTACTING THE STRONGLY ACIDIC CATION EXCHANGE RESIN WITH A CAUSTIC SOLUTION CONTAINING FROM 1 TO 20 WEIGHT PERCENT CAUSTIC TO OBTAIN LITHIUM HYDROXIDE IN SOLUTION AND THE IMPURITIES AS INSOLUBLE HYDROXIDE PRECIPITATES, RECOVERING THE LITHIUM HYDROXIDE FROM THE SOLUTION, AND SEPARATING THE RESIN FROM THE PRECIPITATED IMPURITIES.
Claim 2
Dependent Claim
141 words
A PROCESS FOR THE RECOVERY OF LITHIUM FROM A LITHIUM ALUMINATE COMPLEX PRECIPIATED FROM A CHLORIDE BRINE AND CONTAINING AS IMPURITIES CALCIUM, MAGNESIUM, ALUMINUM AND FERRIC IONS, WHICH COMPRISES HEATING THE LITHIUM ALUMINATE COMPLEX TO A TEMPERATURE OF AT LEAST 75*C. IN THE PRESENCE OF LIQUID WATER TO DECOMPOSE THE LITHIUM ALUMINATE COMPLEX TO ALUMINUM HYDROXIDE, AND A SOLUBLE LITHIUM COMPOUND WHICH DISSOLVES IN THE WATER WITH THE IMPURITIES CONTACTING THE RESULTING LITHIUM CONTAINING SOLUTION WITH A STRONGLY ACIDIC CATION EXCHANGE RESIN TO THEREBY BIND THE LITHIUM AND THE IMPURITIES TO THE RESIN, SUBSEQUENTLY CONTACTING THE STRONGLY ACIDIC CATION EXCHANGE RESIN WITH A CAUSTIC SOLUTION CONTAINING FROM 1 TO 20 WEIGHT PERCENT CAUSTIC TO OBTAIN LITHIUM HYDROXIDE IN SOLUTION AND THE IMPURITIES AS INSOLUBLE HYDROXIDE PRECIPITATES, RECOVERING THE LITHIUM HYDROXIDE FROM THE SOLUTION, AND SEPARATING THE RESIN FROM THE PRECIPITATED IMPURITIES.
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) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |