Production of copper oxides and zinc oxide
Abstract
Abstract A HYDROMETALLUGICAL SYSTEM FOR PRODUCING COPPER OR ZINC OXIDE. A CLOSED EVAPORATOR TANK PARTIALLY IS FILLED WITH MILD AMMONIA HYDROXIDE MAINTAINED BETWEEN 214* F. AND 218*F. BY RECIRCULATION THROUGH A HEAT EXCHANGER EXTERNAL TO THE EVAPORATOR. A PRESSURE OF BETWEEN 5 AND 10 P.S.I. IS MAINTAINED IN THE EVAPORATOR. WHEN A METALRICH AMMONIA CARBONATE SOLUTION FORMED BY LEACHING COPPER OR ZINC IN AN OXYGENATED DISSOLVER TANK IS SUPPLIED TO THE AMMONIA HYDROIDE, A RAPID REACTION TAKES PLACE, CAUSING PRECIPITATION OF THE DESIRED OXIDE AND EVAPORATION OF NH3, CO2 AND WATER. THE PRECIPITATED OXIDES MAY BE REMOVED EITHER CONTINUOUSLY OR IN BATCHES FROM THE EVAPORATOR. THE EVAPORATED GASES ARE CONDENSED AND REUSED IN THE LEACH SOLUTION. EFFICIENT OXYGENATION IN THE DISSOLVER IS ACHIEVED USING A NOVEL AERATOR COMPRISING A HOLLOW CARBON ROD.
Inventors
- 👤 Z Burke
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |