Patent US915531A successfully refreshed from Google Patents.
US3699208A
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Extraction of beryllium from ores
Assignee: Atlantic Richfield Co
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Filing: 1970-12-21
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Granted: 1972-10-17
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Expires: 1990-12-21
Abstract
Abstract The extraction and the recovery of beryllium substantially devoid of zinc and other impurities from low and medium grade acid-leachable berllium bearing ores, e.g., bertrandite, is accomplished by acid leaching at a pH below about 2 but above about 1.2, preferably between 1.3 and 1.5, and advantageously with the aid of a soluble fluoride additive to recover the beryllium in solution with relatively small dissolution of such impurities as iron and aluminum.
Inventors
- 👤 James K Grunig
- 👤 William B Davis
- 👤 William C Aitkenhead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:33
CPC Classifications
C; C22; C22B; C22B35/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
13 words
A process according to claim 1 wherein said mineral acid is sulfuric acid.
Claim 2
Dependent Claim
23 words
A process according to claim 1 wherein the pH of the acid solution is maintained in the range of about 1.3 to 1.5.
Claim 3
Dependent Claim
22 words
A process according to claim 1 wherein a soluble fluoride is added to the leach liquor to increase the rate of leaching.
Claim 4
Dependent Claim
23 words
A process according to claim 4 wherein the amount of fluoride added therein is above about 3 grams per liter of the solution.
Claim 5
Dependent Claim
26 words
A process according to claim 4 wherein the soluble fluoride is at least one of the group consisting of NaF, NH4F, NaHF2, NH4HF2, HF, and AlF3.
References Cited (Backward Citations)
US2148520A
Cited
US2885261A
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US3116110A
Cited
US3116111A
Cited
GB926392A
Cited
US3059998A
Cited
US3177068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |