Patent US139029A successfully refreshed from Google Patents.
Patent US3143486A successfully refreshed from Google Patents.
US3143486A
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Recovery of zinc from zinc plant residue
Assignee: Electrolytic Zinc Company of Australasia Ltd
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Filing: 1961-11-27
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Granted: 1964-08-04
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Expires: 1981-11-27
Abstract
No abstract record available.
Inventors
- 👤 Pickering Ralph Watt
- 👤 Whayman Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:13
CPC Classifications
C; C22; C22B; C22B19/00; C22B19/20; C22B19/22; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
A PROCESS FOR THE EXTRACTION OF ZINC FROM ZINC PLANT RESIDUE CONTAINING ZINC FERRITE WHICH CONSISTS ESSENTIALLY OF SUBJECTING THE RESIDUE T A FIRST STAGE LEACHING TREATMENT IN A SUBSTANTIALLY OXYGEN-FREE ATMOSPHERE IN THE PRESENCE OF SULPHURIC ACID IS EXCESS OF THAT STOICHIOMETRICALLY EQUIVALENT TO THE ZINC IN THE RESIDUE AND AT A TEMPERATURE WITHIN THE RANGE FROM 140*C. TO 260C. AND AT A PRESSURE WHICH IS AT LEAST THE CORRESPONDING VAPOUR PRESSURE OF THE SOLUTION AND SUBJECTIG THE COMBINED SOLID AND LIQUID PRODUCTS OF THE FIRST STAGE LEACHING TREATMENT TO A SECOND STAGE LEACHING TREATMENT IN AN ATMOSPHERE IN WHICH THERE IS A PARTIAL PRESSURE OF OXYGEN AMOUNTING TO AT LEAST 5 POUNDS PER SQUARE INCH ABSOLUTE AT A TEMPERATURE WITHIN THE RANGE FROM 140*C. TO 260*C. AND AT A TOTAL PRESSURE WHICH IS AT LEAST THE SUM OF THE CORRESPONDING VAPOUR PRESSURE OF THE SOLUTION AND THE PARTIAL PRESSURE OF OXYGEN.
Claim 2
Dependent Claim
153 words
A PROCESS FOR THE EXTRACTION OF ZINC FROM ZINC PLANT RESIDUE CONTAINING ZINC FERRITE WHICH CONSISTS ESSENTIALLY OF SUBJECTING THE RESIDUE T A FIRST STAGE LEACHING TREATMENT IN A SUBSTANTIALLY OXYGEN-FREE ATMOSPHERE IN THE PRESENCE OF SULPHURIC ACID IS EXCESS OF THAT STOICHIOMETRICALLY EQUIVALENT TO THE ZINC IN THE RESIDUE AND AT A TEMPERATURE WITHIN THE RANGE FROM 140*C. TO 260C. AND AT A PRESSURE WHICH IS AT LEAST THE CORRESPONDING VAPOUR PRESSURE OF THE SOLUTION AND SUBJECTIG THE COMBINED SOLID AND LIQUID PRODUCTS OF THE FIRST STAGE LEACHING TREATMENT TO A SECOND STAGE LEACHING TREATMENT IN AN ATMOSPHERE IN WHICH THERE IS A PARTIAL PRESSURE OF OXYGEN AMOUNTING TO AT LEAST 5 POUNDS PER SQUARE INCH ABSOLUTE AT A TEMPERATURE WITHIN THE RANGE FROM 140*C. TO 260*C. AND AT A TOTAL PRESSURE WHICH IS AT LEAST THE SUM OF THE CORRESPONDING VAPOUR PRESSURE OF THE SOLUTION AND THE PARTIAL PRESSURE OF OXYGEN.
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) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |