Patent US3990890A successfully refreshed from Google Patents.
US3990890A
Expired / Lapsed
US
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Process for refining molten copper matte with an enriched oxygen blow
Assignee: Creusot Loire SA
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Filing: 1975-06-27
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Granted: 1976-11-09
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Expires: 1995-06-27
Abstract
Abstract A process for refining molten copper matte in a refractory-lined converter having at least one double tuyere located beneath the surface of the molten bath by injecting an oxidizing gas into the matte through the tuyere at a pressure in the range of 6 to 20 bars while also injecting therethrough a cooling agent peripherally of the oxidizing gas. During a first phase of the refining, the oxygen content of the oxidizing gas is varied as necessary up to pure oxygen to maintain the temperature of the matte in the range of 1280° C to 1420° C and still promote sufficient stirring of the molten bath by the injected oxidizing gas. Thereafter, the matte is blown with an oxidizing gas highly enriched with oxygen for a second phase of the refining while still maintaining the temperature in the aforementioned range by adjusting the oxygen content of the oxidizing gas.
Inventors
- 👤 Pierre Leroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:25
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/06; C22B15/00; C22B15/0026; C22B15/0028; C22B15/003; C22B15/0041; C22B15/006; C22B23/02; C22B23/025
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
175 words
A process for refining molten copper matte in a refractory-lined converter having at least one double tuyere located beneath the surface of the molten bath, which process comprises the steps of: oxidizing the iron component of said copper matte by injecting an oxidizing gas having an oxygen content of from 21% to pure oxygen into said matte through said tuyere at a pressure in the range of 6 to 20 bars to maintain the temperature of said matte in the range of 1280° C to 1420° C, while also injecting through said tuyere a cooling agent peripherally of said oxidizing gas; and thereafter oxidizing the sulfur component of said copper matte by injecting an oxidizing gas enriched with oxygen to the extent of being 40% oxygen or greater into said matte through said tuyere at a pressure in the range of 6 to 20 bars to maintain the temperature of said matte in the range of 1280° C to 1420° C, while also injecting through said tuyere a cooling agent peripherally of said oxidizing gas.
Claim 2
Dependent Claim
175 words
A process for refining molten copper matte in a refractory-lined converter having at least one double tuyere located beneath the surface of the molten bath, which process comprises the steps of: oxidizing the iron component of said copper matte by injecting an oxidizing gas having an oxygen content of from 21% to pure oxygen into said matte through said tuyere at a pressure in the range of 6 to 20 bars to maintain the temperature of said matte in the range of 1280° C to 1420° C, while also injecting through said tuyere a cooling agent peripherally of said oxidizing gas; and thereafter oxidizing the sulfur component of said copper matte by injecting an oxidizing gas enriched with oxygen to the extent of being 40% oxygen or greater into said matte through said tuyere at a pressure in the range of 6 to 20 bars to maintain the temperature of said matte in the range of 1280° C to 1420° C, while also injecting through said tuyere a cooling agent peripherally of said oxidizing gas.
Claim 3
Dependent Claim
15 words
A process as recited in claim 1 wherein: said cooling agent is a carbon-containing material.
Claim 4
Dependent Claim
14 words
A process as recited in claim 2 wherein: said carbon-containing material is fuel oil.
Claim 5
Dependent Claim
24 words
A process as recited in claim 3 wherein: said oxidizing gas is injected at a pressure in the range of 6 to 10 bars.
Claim 6
Dependent Claim
37 words
A process as recited in claim 3 wherein: said temperature of said matte is maintained in the range of 1350° C to 1400° C during said steps of oxidizing said iron component and oxidizing said sulfur component.
Claim 7
Dependent Claim
34 words
A process as recited in claim 3 wherein: said step of oxidizing said iron component comprises a plurality of blowing periods each being interrupted for slag removal from said converter and additional charging operations.
Claim 8
Dependent Claim
46 words
A process as recited in claim 6 wherein: each of said blowing periods is commenced by an initial period of injecting pure oxygen as said oxidizing gas followed by a reduction in the oxygen content of said oxidizing gas for the balance of said blowing period.
Claim 9
Dependent Claim
24 words
A process as recited in claim 7 wherein: said oxidizing gas blown during said balance of said blowing period is highly enriched with oxygen.
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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) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |