Patent US3868439A successfully refreshed from Google Patents.
US3868439A
Expired / Lapsed
US
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Method of increasing copper production
Assignee: University of Utah
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Filing: 1973-02-09
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Granted: 1975-02-25
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Expires: 1993-02-09
Abstract
Abstract A method of selectively alternating the oxidation, acid wetting, and leach cycles used on a low grade copper bearing ore or overburden body to thereby enhance the rate of copper recovery therefrom. Control of the pH of the aqueous solution used during the acid wetting phase to a pH value within the range of 1.0 to 2.0 has been found to be unusually significant.
Inventors
- 👤 Milton E Wadsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:15
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0063; C22B15/0065; C22B15/0067; C22B15/0071; C22B15/0002; C22B15/0004; C22B15/0008; C22B15/0084; C22B15/0089; C22B15/0093; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
151 words
IN A METHOD OF ENHANCING RECOVERY OF COPPER VALUES FROM AN ORE MATERIAL HAVING RELATIVELY LOW COPPER VALUES; THE METHOD COMPRISING SEQUENTIALLY: PREPARING THE ORE MATERIAL FOR A SUBSEQUENT LEACHING BY FIRST WETTING THE ORE MATERIAL WITH A FIRST SOLUTION CONSISTING ESSENTIALLY OF AQUEOUS SULFURIC ACID HAVING A PH WITHIN THE RANGE ON THE ORDER OF ABOUT 1.0 TO 2.0, THE WETTING STEP COMPRISING APPLYING SUFFICIENT AQUEOUS SULFURIC ACID TO THE ORE MATERIAL TO AT LEAST ACIDIFY PELLICULAR WATER IN THE ORE MATERIAL WITHOUT CAUSING A SIGNIFICANT AMOUNT OF THE SULFURIC ACID TO PERCOLATE FROM THE ORE MATERIAL; EXPOSING THE ORE MATERIAL TO THE ATMOSPHERE UNTIL AERATION OCCURS; AND CONDUCTING A LEACHING STEP FOR EXTRACTING COPPER VALUES FROM THE ORE MATERIAL BY PERCOLATING A SECOND SOLUTION COMPRISING A SOLUTION OF SULFURIC ACID AND IRON IONS THROUGH THE ORE MATERIAL AND COLLECTING THE SECOND SOLUTION FOR PROCESSING TO RECOVER COPPER VALUES THEREFROM.
Claim 2
Dependent Claim
151 words
IN A METHOD OF ENHANCING RECOVERY OF COPPER VALUES FROM AN ORE MATERIAL HAVING RELATIVELY LOW COPPER VALUES; THE METHOD COMPRISING SEQUENTIALLY: PREPARING THE ORE MATERIAL FOR A SUBSEQUENT LEACHING BY FIRST WETTING THE ORE MATERIAL WITH A FIRST SOLUTION CONSISTING ESSENTIALLY OF AQUEOUS SULFURIC ACID HAVING A PH WITHIN THE RANGE ON THE ORDER OF ABOUT 1.0 TO 2.0, THE WETTING STEP COMPRISING APPLYING SUFFICIENT AQUEOUS SULFURIC ACID TO THE ORE MATERIAL TO AT LEAST ACIDIFY PELLICULAR WATER IN THE ORE MATERIAL WITHOUT CAUSING A SIGNIFICANT AMOUNT OF THE SULFURIC ACID TO PERCOLATE FROM THE ORE MATERIAL; EXPOSING THE ORE MATERIAL TO THE ATMOSPHERE UNTIL AERATION OCCURS; AND CONDUCTING A LEACHING STEP FOR EXTRACTING COPPER VALUES FROM THE ORE MATERIAL BY PERCOLATING A SECOND SOLUTION COMPRISING A SOLUTION OF SULFURIC ACID AND IRON IONS THROUGH THE ORE MATERIAL AND COLLECTING THE SECOND SOLUTION FOR PROCESSING TO RECOVER COPPER VALUES THEREFROM.
Claim 3
Dependent Claim
33 words
The method of claim 1 wherein the steps of wetting the ore material with said sulfuric acid and exposing said ore material to the atmosphere are repeated before said ore material is leached.
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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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |