| (19) |
 |
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(11) |
EP 0 271 464 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
25.10.1989 Bulletin 1989/43 |
| (43) |
Date of publication A2: |
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15.06.1988 Bulletin 1988/24 |
| (22) |
Date of filing: 03.12.1987 |
|
| (51) |
International Patent Classification (IPC)4: C21B 5/00 |
|
| (84) |
Designated Contracting States: |
|
AT BE CH DE ES FR GB GR IT LI LU NL SE |
| (30) |
Priority: |
05.12.1986 SE 8605226
|
| (71) |
Applicant: Nonox Engineering AB |
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S-182 75 Stocksund (SE) |
|
| (72) |
Inventor: |
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- Collin, Per H.
S-182 75 Stocksund (SE)
|
| (74) |
Representative: Aslund, Roland |
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SSAB SVENSKT STAL AB
Patent Department
781 84 Borlange
781 84 Borlange (SE) |
|
| |
|
| (54) |
A method of producing liquid crude iron and high-grade top gas |
(57) A blast furnace is fed by a charge of conventional composition and a blast is used
that contains about 50% oxygen and 20% water vapour, balance nitrogen. Additional
fuel in the form of coal dust and/or oil is supplied to the raceways. Normal temperatures
are maintained in the hearth and top zones. As compared with conventional operation
a very high specific crude iron production per m² of hearth area and 24 hours will
result. The molecular ratio CO+H₂/N₂ of the top gas will be higher than 2.8 which
makes the top gas suitable for ammonia production.