US2655472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of extracting and recovering metals by leaching and electrolysis
Assignee: Individual
•
Filing: 1949-12-16
•
Granted: 1953-10-13
•
Expires: 1969-12-16
Abstract
No abstract record available.
Inventors
- 👤 Robert V Hilliard
- 👤 Charles T Baroch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:08
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/08; C22B3/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
THE METHOD FOR THE SEPARATION AND RECOVERY OF METALLIC CONSTITUENTS OF OXIDIZED LEAD-ZINC ORES WHICH CONTAIN OTHER METALS INCLUDING GOLD, SILVER, AND COPPER, IN ADDITION TO LEAD AND ZINC WHICH COMPRISES THE STEPS OF LEACHING THE OXIDIZED ORE IN AN ALKALI-CYANIDE SOLUTION; TREATING THE PREGNANT LEACH SOLUTION WITH LIME; REMOVING THE INSOLUBLE RESIDUES FROM THE THUS TREATED SOLUTION; DISPLACING THE GOLD AND SILVER IN THE SOLUTION WITH METALLIC COPPER; SEPARATING THE PRECIPITATED GOLD METAL AND SILVER METAL; DISPLACING THE COPPER FROM THE SOLUTION WITH METALLIC LEAD; SEPARATING THE PRECIPITATED COPPER METAL; ADJUSTING THE TEMPERATURE OF THE SOLUTION TO ABOUT 35* TO ABOUT 50* C., DISPLACING LEAD AND ANY REMAINING METALS BELOW ZINC IN THE ELECTROMOTIVE FORCE SERIES OF ELEMENTS BY CONTACTING THE SOLUTION WITH ELECTROLYTIC FLAKE ZINC, IMMEDIATELY REMOVING THE METAL PRECIPITATE FROM SOLUTION; ELECTROWINNING METALLIC ZINC FROM THE ALKALI SOLUTION FROM WHICH THE MORE NOBLE METALS HAVE BEEN SEPARATED; AND RECYCLING THE BARREN ALKALINE SOLUTION TO THE LEACH STEP.
Claim 2
Independent Claim
160 words
THE METHOD FOR THE SEPARATION AND RECOVERY OF METALLIC CONSTITUENTS OF OXIDIZED LEAD-ZINC ORES WHICH CONTAIN OTHER METALS INCLUDING GOLD, SILVER, AND COPPER, IN ADDITION TO LEAD AND ZINC WHICH COMPRISES THE STEPS OF LEACHING THE OXIDIZED ORE IN AN ALKALI-CYANIDE SOLUTION; TREATING THE PREGNANT LEACH SOLUTION WITH LIME; REMOVING THE INSOLUBLE RESIDUES FROM THE THUS TREATED SOLUTION; DISPLACING THE GOLD AND SILVER IN THE SOLUTION WITH METALLIC COPPER; SEPARATING THE PRECIPITATED GOLD METAL AND SILVER METAL; DISPLACING THE COPPER FROM THE SOLUTION WITH METALLIC LEAD; SEPARATING THE PRECIPITATED COPPER METAL; ADJUSTING THE TEMPERATURE OF THE SOLUTION TO ABOUT 35* TO ABOUT 50* C., DISPLACING LEAD AND ANY REMAINING METALS BELOW ZINC IN THE ELECTROMOTIVE FORCE SERIES OF ELEMENTS BY CONTACTING THE SOLUTION WITH ELECTROLYTIC FLAKE ZINC, IMMEDIATELY REMOVING THE METAL PRECIPITATE FROM SOLUTION; ELECTROWINNING METALLIC ZINC FROM THE ALKALI SOLUTION FROM WHICH THE MORE NOBLE METALS HAVE BEEN SEPARATED; AND RECYCLING THE BARREN ALKALINE SOLUTION TO THE LEACH STEP.
References Cited (Backward Citations)
US592055A
Cited
GB189724121A
Cited
US780293A
Cited
FR415639A
Cited
US1115521A
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US1578618A
Cited
US1759494A
Cited
US2187750A
Cited
US2286240A
Cited
US2340188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-12 | 1957-04-13 | 1957-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-12 | 1961-04-13 | 1961-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-12 | 1965-04-13 | 1965-10-13 | $7700.00 | Window Closed / Lapsed |