Leaching beryllium
Abstract
Abstract A method of leaching beryllium from beryllium ore and separating the beryllium from contaminates in the leach liquor, the leaching method comprising exposing beryllium ore to a concentrated caustic solution under elevated temperature conditions. The beryllium along with certain contaminates is separated from the leach liquor by (a) diluting the solution, adding calcium chloride or other soluble calcium salt, and coprecipitating beryllium, calcium hydroxide and other contaminates, or by (b) diluting the solution, adding calcium hydroxide, or calcium oxide and heating in an autoclave to suitable temperature for an appropriate time interval. Contaminates, including silica, may be removed from the leach solution by adding calcium hydroxide (or oxide) without reducing the pH (without diluting the solution) and heating in an autoclave at suitable temperature for an appropriate time interval. The beryllium under these conditions remains in the solution. Under conditions (a) or (b) the precipitate which includes the beryllium is treated by common chemical procedures for isolation of the beryllium as beryllium hydroxide.
Inventors
- 👤 Charles K Hanson
- 👤 Milton E Wadsworth
Bibliographic Details
Claims Analysis
Total Claims: 2References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |