US3617042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for continuous refining of molten metals
Assignee: National Institute for Materials Science
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Filing: 1968-08-12
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Granted: 1971-11-02
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Expires: 1988-08-12
Abstract
Abstract Apparatus for refining metals comprising two or more trough type furnaces. Each furnace includes a blowing zone having lances for feeding oxygen and slag forming materials and a flow zone wherein metal and slag flow concurrently or countercurrently. Pig iron is refined continuously by passing it through the furnaces. Residence time in each furnace is 1 to 15 minutes. CaO added to the first blowing zone is one-sixtieth to one-fifteenth of the metal. Temperatures of the metal leaving the first and second furnaces are controlled to below 1,550* C. and within 1,550* to 1,700* C. respectively.
Inventors
- 👤 Ryuichi Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:30
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/56; C21C5/567; Y; Y10; Y10S; Y10S75/00; Y10S75/957
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
The apparatus for continuous refining of a molten metal according to claim 1 wherein a reservoir for the molten metal is provided between one furnace and another furnace adjacent thereto, said reservoir having a capacity for temporarily holding a flowing molten metal halfways in a path through Which a molten metal from one furnace is continuously transferred into a flow inlet of the next furnace.
Claim 2
Dependent Claim
50 words
The apparatus for continuous refining of a molten metal according to claim 1 wherein said blowing zone in the furnace is located on the side near said flow inlet for the molten metal and said flow zone is located on the side near said flow outlet for the molten metal.
Claim 3
Dependent Claim
59 words
The apparatus for continuous refining of a molten metal according to claim 1 wherein said blowing zone in the furnace is located on the side near said flow outlet for the molten metal, and lances are provided inclined so that oxygen may be blown in a direction opposite to the direction of movement of the stream of molten metal.
Claim 4
Dependent Claim
31 words
The apparatus of claim 1 wherein said lance of said blowing zone and said flow inlet and flow outlet are so positioned that said molten metal and resulting slag flow concurrently.
Claim 5
Dependent Claim
31 words
The apparatus of claim 1 wherein said lance of said blowing zone and said flow inlet and flow outlet are so positioned that said molten metal and resulting slag flow countercurrently.
References Cited (Backward Citations)
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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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |