EP0128131B1 - Verfahren zum Entfernen von Schwefel bei der Erschmelzung von Roheisen - Google Patents

Verfahren zum Entfernen von Schwefel bei der Erschmelzung von Roheisen Download PDF

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Publication number
EP0128131B1
EP0128131B1 EP84890076A EP84890076A EP0128131B1 EP 0128131 B1 EP0128131 B1 EP 0128131B1 EP 84890076 A EP84890076 A EP 84890076A EP 84890076 A EP84890076 A EP 84890076A EP 0128131 B1 EP0128131 B1 EP 0128131B1
Authority
EP
European Patent Office
Prior art keywords
desulfurating
agent
slag
lumpy
coal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84890076A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0128131A1 (de
Inventor
Horst Dipl.-Ing. Sulzbacher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voestalpine AG
Original Assignee
Voestalpine AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voestalpine AG filed Critical Voestalpine AG
Publication of EP0128131A1 publication Critical patent/EP0128131A1/de
Application granted granted Critical
Publication of EP0128131B1 publication Critical patent/EP0128131B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
    • C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
    • C21B13/002—Reduction of iron ores by passing through a heated column of carbon

Definitions

  • the invention relates to a method for removing sulfur in the melting of pig iron in a coal fluidized bed.
  • the invention now aims to avoid such a separate desulphurization of the melt and to carry out most or all of the desulphurization work not only of the coal but also of the melt in the smelting reactor.
  • the invention essentially consists in that lumpy and granular desulfurizing agent is introduced into the carbon fluidized bed and in the slag layer, that the portion of the desulfurizing agent for the coal spines is in the grain size range of 0.5-5 mm and the portion of the desulfurizing agent for the Slag in the grain size range of 5 - 50mm is introduced and that the proportion of lumpy desulfurizing agent in the total mixture is selected to be less than or equal to 50% by weight.
  • Such a control possibility is achieved according to the invention by introducing the proportion of the desulfurization agent for the coal fluidized bed in the grain size range of 0.5-5 mm and the proportion of the desulfurization agent for the slag in the grain size range of 5-50 mm, these two proportions being varied within wide limits can and in this way an adjustment of the heavy weight of the desulfurization reaction to the fluidized bed or the slag layer can be achieved.
  • the desulfurization reaction with CaO is endothermic and preferably takes place in the direction of higher temperatures.
  • the feedstocks intended for post-desulphurization have already been metered into the melter gasifier in granular and / or lumpy form and whirled together with the coal according to their grain size. They bind the carbon sulfur in a solid, liquid or sublimed state of aggregation or, in the case of a coarser grain, immediately fall through the fluidized bed and slowly dissolve in the slag layer in close contact with the melting iron sponge.
  • the heavy weight of the desulfurization reaction can be shifted into the fluidized bed or into the slag layer by varying the lumpy or granular fraction of the desulfurization agent.
  • manganese, calcium, magnesium, alkalis or rare earths in the form of oxides, carbides, carbonates, alloys, mixed metals or in metallic form can be used as the desulfurizing agent.
  • the use of calcium carbonate alone has the disadvantage that, when charging directly into the carburetor, considerable amounts of energy are required to drive off and convert C0 2 .
  • Calcium carbide is therefore used according to the invention in a particularly preferred manner as a desulfurization agent. The desulfurization reaction with CaC 2 takes place with the release of energy and preferably in the direction of low temperatures.
  • Calcium carbide also acts as a deoxidizer to reduce the FeO content in the slag.
  • the reaction products CaO and CaS are taken up by the slag.
  • the process according to the invention is advantageously carried out in such a way that the granular and the lumpy portion of the desulfurization agent is introduced above or laterally into the carbon fluidized bed.
  • the desulfurization agent can be introduced in a simple manner together with coal, aggregates or recycling materials.
  • the desulfurizing agents are at least partially introduced in agglomerated form.
  • the invention is explained in more detail below using an exemplary embodiment.
  • About 1000 kg of coal were used in a smelting gasifier per ton of pig iron.
  • the coal had a sulfur content of 1.0%.
  • the sulfur was composed of 60% organically bound sulfur and 40% inorganic sulfur (pyrite, sulfide, sulfate-S). Most of the inorganic sulfur was released during the degassing of the coal and went into the reducing gas. The remaining sulfur, approx. 6-7 kg / t pig iron, was converted into the gaseous state in the fluidized bed during combustion in front of the nozzles or gasification of the coked coal (S-Dampf, S0 2 , COS).
  • the gaseous sulfur came into contact with the fine-grained CaC 2 and was bound to CaS.
  • About 4 kg of S were converted into CaS in this way.
  • the remaining 3 kg were either absorbed by the aggregate lime or by the hot sponge iron that fell through the fluidized bed.
  • the iron sponge containing Fe was then desulfurized on contact with the lumpy calcium carbide floating on the slag surface.
  • the reaction product CaS dissolved in the slag.
  • the sulfur content of the slag was between 2 and 3% and the sulfur in pig iron was 0.1%.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
EP84890076A 1983-05-04 1984-04-26 Verfahren zum Entfernen von Schwefel bei der Erschmelzung von Roheisen Expired EP0128131B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0164683A AT387036B (de) 1983-05-04 1983-05-04 Verfahren zum entfernen von schwefel bei der erschmelzung von roheisen
AT1646/83 1983-05-04

Publications (2)

Publication Number Publication Date
EP0128131A1 EP0128131A1 (de) 1984-12-12
EP0128131B1 true EP0128131B1 (de) 1987-04-01

Family

ID=3517920

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84890076A Expired EP0128131B1 (de) 1983-05-04 1984-04-26 Verfahren zum Entfernen von Schwefel bei der Erschmelzung von Roheisen

Country Status (5)

Country Link
US (1) US4566902A (enrdf_load_stackoverflow)
EP (1) EP0128131B1 (enrdf_load_stackoverflow)
JP (1) JPS59208007A (enrdf_load_stackoverflow)
AT (1) AT387036B (enrdf_load_stackoverflow)
DE (1) DE3462925D1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT388176B (de) * 1987-07-30 1989-05-10 Voest Alpine Ag Verfahren und anlage zur gewinnung von fluessigem roheisen oder stahlvorprodukten aus stueckigen, eisenoxidhaeltigen einsatzstoffen
CN115044402B (zh) * 2022-06-13 2023-04-25 太原理工大学 一种煤的原位高温溶浸脱硫方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1153395B (de) * 1953-05-29 1963-08-29 Werner Wenzel Dr Ing Verfahren zur Eisengewinnung aus in der Schwebe befindlichen, staub-foermigen bzw. feinkoernigen Eisenerzen mittels Brennstoffen in feinem Verteilungs-grad
DE1160457B (de) * 1955-06-18 1964-01-02 Knapsack Ag Verfahren zur Kokseinsparung und Leistungssteigerung bei der Herstellung von Roheisen im Hochofen
DE2133860A1 (en) * 1970-07-07 1972-01-13 Barker, Arnold Verdun, Palm Beach, New South Wales (Australien) Direct reduction of iron ore - using cyclone furnace and electric arc or induction furnace
US3948640A (en) * 1973-04-30 1976-04-06 Boliden Aktiebolag Method of carrying out heat-requiring chemical and/or physical processes
DE2401909C3 (de) * 1974-01-16 1985-06-27 Fried. Krupp Gmbh, 4300 Essen Verfahren zur Herstellung von Stahl
SE388875B (sv) * 1975-03-03 1976-10-18 Stora Kopparbergs Bergslags Ab Sett vid reduktion av finkornigt jernoxidhaltigt material i flyttbedd
DE2843303C2 (de) * 1978-10-04 1982-12-16 Korf-Stahl Ag, 7570 Baden-Baden Verfahren und Anlage zur Erzeugung von flüssigem Roheisen und Reduktionsgas in einem Einschmelzvergaser
US4260412A (en) * 1980-01-16 1981-04-07 Midrex Corporation Method of producing direct reduced iron with fluid bed coal gasification
SE457265B (sv) * 1981-06-10 1988-12-12 Sumitomo Metal Ind Foerfarande och anlaeggning foer framstaellning av tackjaern

Also Published As

Publication number Publication date
AT387036B (de) 1988-11-25
EP0128131A1 (de) 1984-12-12
ATA164683A (de) 1988-04-15
US4566902A (en) 1986-01-28
DE3462925D1 (en) 1987-05-07
JPS59208007A (ja) 1984-11-26
JPH046767B2 (enrdf_load_stackoverflow) 1992-02-06

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