US2753258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering gold from cyanide solutions
Assignee: NAT RES DEV
•
Filing: 1953-01-19
•
Granted: 1956-07-03
•
Expires: 1973-01-19
Abstract
No abstract record available.
Inventors
- 👤 Burstall Francis Hereward
- 👤 Forrest Phyllis Joan
- 👤 Kember Norman Frank
- 👤 Wells Ronald Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:44
CPC Classifications
C; C01; C01G; C01G7/00; C01G7/003; C22; C22B; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
149 words
A METHOD OF RECOVERING GOLD FROM AQUEOUS CYANIDE SOLUTIONS CONTAINING THE SAME AND OTHER METALS INCLUDING COPPER, NICKEL, IRON, ZINC WHICH COMPRISES PASSING THE SOLUTIN INTO CONTACT WITH A STRONGLY BASIC ANION EXCHANGE RESIN TO BRING ABOUT ADSORPTION OF AUROCYANIDE ON THE ANION EXCHANGE RESIN, ELUTING THE LATTER WITH AQUEOUS INORGANIC ACID TO EXTRACT THE GREATER PART OF THE NICKEL AND ZINC AND SOME OF THE COPPER LEAVING GOLD AND ANY SILVER PRESENT ON THE ANION EXCHANGE RESIN, THEN ELUTING THE ANION EXCHANGE RESIN WITH AQUEOUS ALKALI METAL CYANIDE SOLUTION TO EXTRACT SOME OF THE COPPER, THE GREATER PART OF THE IRON AND SOME NICKEL AND ZINC WHILE LEAVING GOLD AND ANY SILVER PRESENT ON THE ANION EXCHAGE RESIN AND THEN ELUTING THE ANION EXCHANGE RESIN WITH AN ORGANIC SOLVENT CONTAINING A MINOR PROPORTION OF INORGANIC ACID TO EXTRACT SUBSTANTIALLY ALL THE GOLD AND ANY SILVER AND COPPER PRESENT.
References Cited (Backward Citations)
US799548A
Cited
US2648601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-03 | 1960-01-02 | 1960-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-03 | 1964-01-02 | 1964-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-03 | 1968-01-02 | 1968-07-03 | $7700.00 | Window Closed / Lapsed |