US3059998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of beryllium from acid leach solutions
Assignee: Dow Chemical Co
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Filing: 1961-11-08
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Granted: 1962-10-23
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Expires: 1981-11-08
Abstract
No abstract record available.
Inventors
- 👤 William A Mod
- 👤 Jackson Lake
- 👤 Charles W Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:13
CPC Classifications
C; C01; C01F; C01F3/00; C22; C22B; C22B35/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
186 words
A PROCESS FOR THE RECOVERY OF BERYLIUM FROM AN ACID LEACH SOLUTION CONTAINING AS AN IMPURITY CALCIUM ION IN A CONCENTRATION EXCEEDING THAT OF THE BERYLLIUM, WHICH COMPRISES ADDING TO THE ACID LEACH SOLUTION AT A TEMPERATURE IN THE RANGE OF 60* TO 80*C. A STOICHIOMETRIC AMOUNT OF A SOLUBLE SULFATE TO REACT WITH THE CALCIUM IONS PRESENT, ADDING A SOLUBLE ALKALINE COMPOUND TO THE SULFATE-CONTAINING SOLUTION UNTIL THE PH OF THE SOLUTION IS IN THE RANGE OF 3.3 TO 3.7 TO THEREBY PRECIPITATE A SUBSTANTIAL PORTION OF THE CALCIUM PRESENT AS CALCIUM SULFATE, SEPARATING THE PRECIPITATE CALCIUM SULFATE FROM THE RESULTING MIXTURE, ADDING ADDITIONAL AMOUNTS OF A SOLUBLE ALKALINE COMPOUND TO THE SULFATE-FREE SOLUTION UNTIL THE PH OF THE SOLUTION IS IN THE RANGE OF 12 TO 13 TO THEREBY OBTAIN A PRECIPITATE OF CALCIUM AND BERYLLIUM IN A COMBINED FORM, SEPARATING THE PRECIPITATE OF CALCIUM AND BERYLLIUM OBTAINED AND RECYCLING IT BACK TO THE FIRST STEP OF THE PROCESS, HEATING THE REMAINING SOLUTION TO BOILING TO HYDROLYZE THE BERYLLIUM IN THE SOLUTION TO BERYLLIUM HYDROXIDE, AND SEPARATING THE BERYLLIUM HYDROXIDE FROM THE REMAINING SOLUTION.
Claim 2
Dependent Claim
186 words
A PROCESS FOR THE RECOVERY OF BERYLIUM FROM AN ACID LEACH SOLUTION CONTAINING AS AN IMPURITY CALCIUM ION IN A CONCENTRATION EXCEEDING THAT OF THE BERYLLIUM, WHICH COMPRISES ADDING TO THE ACID LEACH SOLUTION AT A TEMPERATURE IN THE RANGE OF 60* TO 80*C. A STOICHIOMETRIC AMOUNT OF A SOLUBLE SULFATE TO REACT WITH THE CALCIUM IONS PRESENT, ADDING A SOLUBLE ALKALINE COMPOUND TO THE SULFATE-CONTAINING SOLUTION UNTIL THE PH OF THE SOLUTION IS IN THE RANGE OF 3.3 TO 3.7 TO THEREBY PRECIPITATE A SUBSTANTIAL PORTION OF THE CALCIUM PRESENT AS CALCIUM SULFATE, SEPARATING THE PRECIPITATE CALCIUM SULFATE FROM THE RESULTING MIXTURE, ADDING ADDITIONAL AMOUNTS OF A SOLUBLE ALKALINE COMPOUND TO THE SULFATE-FREE SOLUTION UNTIL THE PH OF THE SOLUTION IS IN THE RANGE OF 12 TO 13 TO THEREBY OBTAIN A PRECIPITATE OF CALCIUM AND BERYLLIUM IN A COMBINED FORM, SEPARATING THE PRECIPITATE OF CALCIUM AND BERYLLIUM OBTAINED AND RECYCLING IT BACK TO THE FIRST STEP OF THE PROCESS, HEATING THE REMAINING SOLUTION TO BOILING TO HYDROLYZE THE BERYLLIUM IN THE SOLUTION TO BERYLLIUM HYDROXIDE, AND SEPARATING THE BERYLLIUM HYDROXIDE FROM THE REMAINING SOLUTION.
References Cited (Backward Citations)
US2899276A
Cited
US2974011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-22 | 1966-04-23 | 1966-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-22 | 1970-04-23 | 1970-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-22 | 1974-04-23 | 1974-10-23 | $7700.00 | Window Closed / Lapsed |