US4397691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing Fe-B molten metal
Assignee: JFE Steel Corp
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Filing: 1982-07-22
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Granted: 1983-08-09
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Expires: 2002-07-22
Abstract
Abstract Fe-B molten metal for producing amorphous alloys are produced in a low cost by using a vertical furnace wherein beds packed with a carbonaceous solid reducing agent are formed and two or three stages of tuyeres are provided in the lower portion of said furnace, feeding a preliminarily reduced powdery iron ore into the furnace through the upper stage of tuyeres together with hot air and feeding boron oxide or boric acid into the furnace through the lower stage of tuyeres together with hot air and, if necessary blowing hot air into the furnace through the lowest stage of tuyeres. In stead of the above described vertical furnace, a usual blast furnace provided with one or two stages of tuyeres at the lower portion of said furnace is used. In this case, sintered iron ore, pellet-formed iron ore or lump iron ore is fed from the top of the furnace and powdery boron oxide or boric acid is fed through the tuyeres.
Inventors
- 👤 Takao Hamada
- 👤 Nobuo Tsuchiya
- 👤 Toshihiro Inatani
- 👤 Yoshiyasu Takada
- 👤 Mitsuo Sumito
- 👤 Eiji Katayama
- 👤 Toshimitsu Koitabashi
- 👤 Kyoji Okabe
- 👤 Yo Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:11
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/003
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
A method for producing ferro-boron which comprises introducing a reducing gas into a fluidizing furnace, the reducing gas being exhausted from a vertical furnace which is filled with a carbonaceous solid reducing agent and provided with a plurality of tuyeres at an upper stage and a lower stage, respectively, at the lower portion thereof, preliminarily reducing powdery iron ore in the fluidizing furnace with the exhausted reducing gas feeding the resulting preliminarily reduced iron ore together with hot air through the tuyeres at the upper stage into the vertical furnace, and feeding powdery boron oxide or boric acid in a weight ratio of boron oxide to iron oxide being 0.05-0.8 together with hot air through the tuyeres of the lower stage into the vertical furnace to subject the preliminarily reduced iron oxide ore and boron oxide or boric acid to reduction reaction.
Claim 2
Independent Claim
142 words
A method for producing ferro-boron which comprises introducing a reducing gas into a fluidizing furnace, the reducing gas being exhausted from a vertical furnace which is filled with a carbonaceous solid reducing agent and provided with a plurality of tuyeres at an upper stage and a lower stage, respectively, at the lower portion thereof, preliminarily reducing powdery iron ore in the fluidizing furnace with the exhausted reducing gas feeding the resulting preliminarily reduced iron ore together with hot air through the tuyeres at the upper stage into the vertical furnace, and feeding powdery boron oxide or boric acid in a weight ratio of boron oxide to iron oxide being 0.05-0.8 together with hot air through the tuyeres of the lower stage into the vertical furnace to subject the preliminarily reduced iron oxide ore and boron oxide or boric acid to reduction reaction.
Claim 3
Dependent Claim
44 words
The method as claimd in claim 1, wherein hot air is blown into the furnace through addtional plurality of tuyeres provided at the stage which is lower than the stage of the tuyeres for feeding boron oxide or boric acid in the vertical furnace.
Claim 4
Independent Claim
62 words
A method for producing ferro-boron which comprises feeding iron oxide and coke into a blast furnace provided with a plurality of tuyeres at the lower portion thereof, and feeding powdery boron oxide or boric acid in a weight ratio of boric acid to iron oxide being 0.05-0.8 into said furnace through the tuyeres to melt and reduce boron oxide or boric acid.
Claim 5
Independent Claim
62 words
A method for producing ferro-boron which comprises feeding iron oxide and coke into a blast furnace provided with a plurality of tuyeres at the lower portion thereof, and feeding powdery boron oxide or boric acid in a weight ratio of boric acid to iron oxide being 0.05-0.8 into said furnace through the tuyeres to melt and reduce boron oxide or boric acid.
Claim 6
Dependent Claim
45 words
The method as claimed in claim 3, wherein hot air is blown into the blast furnace through additional plurality of tuyeres provided at the stage which is lower than the stage of the tuyeres for feeding boron oxide or boric acid in the blast furnace.
References Cited (Backward Citations)
US1537997A
Cited
US2162402A
Cited
US2544697A
Cited
US2755181A
Cited
US3809547A
Cited
US4124378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |