US4401468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing precious metals from ore
Assignee: Individual
•
Filing: 1983-01-28
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Granted: 1983-08-30
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Expires: 2003-01-28
Abstract
Abstract An improved cyanide process sprays an ore-cyanide leach solution into air at a high velocity to oxygenate the slurry and catalyze the reaction between the ore and cyanide leach solution.
Inventors
- 👤 Charles T. Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:40
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A process for removing precious metals from comminuted ores, comprising the steps of: (a) contacting said comminuted ore with an effective amount of a basic aqueous solution to effect a stabilized pH of 10 to 11; (b) allowing the pH of the ore-basic ore-aqueous solution mixture to stabilize; (c) mixing cyanide in the stabilized ore-aqueous solution mixture to form an extraction mixture slurry; (d) spraying said extraction mixture slurry through at least one nozzle into an air atmosphere and deflecting said sprayed slurry back toward said nozzle; (e) separating said sprayed slurry into a liquid and solid component; and (f) processing said liquid component to remove precious metals therefrom.
Claim 2
Dependent Claim
109 words
A process for removing precious metals from comminuted ores, comprising the steps of: (a) contacting said comminuted ore with an effective amount of a basic aqueous solution to effect a stabilized pH of 10 to 11; (b) allowing the pH of the ore-basic ore-aqueous solution mixture to stabilize; (c) mixing cyanide in the stabilized ore-aqueous solution mixture to form an extraction mixture slurry; (d) spraying said extraction mixture slurry through at least one nozzle into an air atmosphere and deflecting said sprayed slurry back toward said nozzle; (e) separating said sprayed slurry into a liquid and solid component; and (f) processing said liquid component to remove precious metals therefrom.
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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |