US3773494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smelting of copper sulphide concentrates with ferrous sulphate
Assignee: Treadwell Corp
•
Filing: 1971-12-10
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Granted: 1973-11-20
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Expires: 1991-12-10
Abstract
Abstract In smelting ores and concentrates of copper or nickel, matte fall is obtained by recycle of ferrous sulfate which is produced when the matte is leached with sulfuric acid. The residue from leaching then contains the copper, nickel or cobalt values in concentrated form. In this method the ferrous sulfate is reduced to ferrous sulfide at elevated temperatures. This is the basis of molten matte, wherein the metal values are collected and then separated from the iron sulfide by leaching. The iron contained in the concentrate is removed ultimately in slag.
Inventors
- 👤 S Tuwiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:26
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0026; C22B15/0028; C22B15/0063; C22B15/0065; C22B15/0067; C22B15/0071; C22B23/00; C22B23/02; C22B23/025; C22B23/04; C22B23/0407; C22B23/0415; C22B23/043; C22B5/00; C22B5/02; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
30 words
A method according to claim 1 in which the ore or concentrate also contains substantial values of at least one metal selected from the group consisting of nickel and cobalt.
Claim 2
Dependent Claim
17 words
A method according to claim 2 in which the heating is effected with fuel and oxygen-containing gas.
Claim 3
Dependent Claim
17 words
A method according to claim 1 in which the heating is effected with fuel and oxygen-containing gas.
Claim 4
Dependent Claim
20 words
A method according to claim 1 in which the ferrous sulfate is obtained by leaching the matte with sulfuric acid.
Claim 5
Dependent Claim
20 words
A method according to claim 2 in which the ferrous sulfate is obtained by leaching the matte with sulfuric acid.
Claim 6
Dependent Claim
25 words
A method according to claim 5 in which the matte is activated by subjecting it to reduction while in the molten state prior to leaching.
Claim 7
Dependent Claim
25 words
A method according to claim 6 in which the matte is activated by subjecting it to reduction while in the molten state prior to leaching.
References Cited (Backward Citations)
US247494A
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US1730775A
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US1943738A
Cited
US2934428A
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US3093559A
Cited
US3081163A
Cited
US3441403A
Cited
US3545961A
Cited
US3637371A
Cited
US3669647A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |