US3868440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of metal values from copper slag
Assignee: Atlantic Richfield Co
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Filing: 1973-05-30
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Granted: 1975-02-25
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Expires: 1993-05-30
Abstract
Abstract A hydrometallurgical process for treating slag material, especially copper smelter slag material, comprises vigorously mixing the slag material with about one part by weight of sulfuric acid and about one part by weight of water for each part by weight of the slag material, and allowing the resulting mixture to react to produce a dry, solid material, containing the metal values of the slag in water-soluble form. These solubilized metal values may be separated by leaching from the insoluble silicious residue of the dry solid material.
Inventors
- 👤 Kenneth O Lindblad
- 👤 Ralph E Dufresne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:34
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0063; C22B15/0065; C22B15/0082; C22B15/0002; C22B15/0004; C22B15/0008; C22B15/0067; C22B15/0071; C22B3/00; C22B3/04; C22B3/06; C22B3/08; C22B7/00; C22B7/04; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
A process for the recovery of metal values from copper smelter slag material which comprises mixing with agitation a unit part by weight of slag and about a unit part by weight of concentrated sulfuric acid to form an acid-slag mixture, incorporating in the acid-slag mixture about a unit part by weight of water, and allowing the mixture to react to produce a dry, solid material in which metal values are converted to water-soluble form readily separable from the insoluble silicious residue.
Claim 2
Dependent Claim
82 words
A process for the recovery of metal values from copper smelter slag material which comprises mixing with agitation a unit part by weight of slag and about a unit part by weight of concentrated sulfuric acid to form an acid-slag mixture, incorporating in the acid-slag mixture about a unit part by weight of water, and allowing the mixture to react to produce a dry, solid material in which metal values are converted to water-soluble form readily separable from the insoluble silicious residue.
Claim 3
Dependent Claim
31 words
A process according to claim 1 wherein the dry, solid material is allowed to age for a time sufficient to increase the degree of conversion of metal values to water-soluble form.
Claim 4
Dependent Claim
25 words
A process according to claim 2 wherein the dry, solid material is maintained at an autogenously developed temperature of from about 75*C. to about 100*C.
Claim 5
Dependent Claim
29 words
A process according to claim 2 wherein the aqueous acidic slag mixture is maintained at the elevated temperature for the period of time of from 8 to 30 hours.
Claim 6
Dependent Claim
15 words
A process according to claim 1 wherein the initial slag material is in particulate form.
Claim 7
Dependent Claim
32 words
A process according to claim 1 wherein the dry solid reaction product is subjected to a leaching operation with an aqueous solvent to extract the soluble metal values from the insoluble residue.
Claim 8
Dependent Claim
100 words
A PROCESS FOR RECOVERY OF METAL VALUES FROM COPPER SMELTER SLAG MATERIAL WHICH COMPRISES MIXING WITH ABOUT ONE PART BY WEIGHT OF THE SLAG MATERIAL UP TO ONE PART OF WATER, ADDING WITH AGITATION ABOUT ONE PART OF CONCENTRATED SULFURIC ACID AND UP TO ABOUT ONE PART OF WATER TO FORM A MIXTURE WHICH CONTAINS A TOTAL SLAG-TO-WATER RATIO OF ABOUT 1:1 THEREBY TO PRODUCE A SUBSTANTIALLY DRY, SOLID MATERIAL, ALLOWING THE RESULTING DRY, SOLID MATERIAL TO REACT FOR A TIME SUFFICIENT TO INSURE MAXIMUM CONVERSION OF METAL VALUES TO WATER-SOLUBLE FORM, AND LEACHING THE RESULTING DRY, SOLID REACTION PRODUCT
Claim 9
Dependent Claim
100 words
A PROCESS FOR RECOVERY OF METAL VALUES FROM COPPER SMELTER SLAG MATERIAL WHICH COMPRISES MIXING WITH ABOUT ONE PART BY WEIGHT OF THE SLAG MATERIAL UP TO ONE PART OF WATER, ADDING WITH AGITATION ABOUT ONE PART OF CONCENTRATED SULFURIC ACID AND UP TO ABOUT ONE PART OF WATER TO FORM A MIXTURE WHICH CONTAINS A TOTAL SLAG-TO-WATER RATIO OF ABOUT 1:1 THEREBY TO PRODUCE A SUBSTANTIALLY DRY, SOLID MATERIAL, ALLOWING THE RESULTING DRY, SOLID MATERIAL TO REACT FOR A TIME SUFFICIENT TO INSURE MAXIMUM CONVERSION OF METAL VALUES TO WATER-SOLUBLE FORM, AND LEACHING THE RESULTING DRY, SOLID REACTION PRODUCT
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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 |