EP0946760B1 - Verfahren und vorrichtung zur erzeugung von siliziumreichen giessereiroheisen - Google Patents

Verfahren und vorrichtung zur erzeugung von siliziumreichen giessereiroheisen Download PDF

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Publication number
EP0946760B1
EP0946760B1 EP97918880A EP97918880A EP0946760B1 EP 0946760 B1 EP0946760 B1 EP 0946760B1 EP 97918880 A EP97918880 A EP 97918880A EP 97918880 A EP97918880 A EP 97918880A EP 0946760 B1 EP0946760 B1 EP 0946760B1
Authority
EP
European Patent Office
Prior art keywords
furnace
vessel
iron
direct current
sleeve
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 - Lifetime
Application number
EP97918880A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0946760A1 (de
Inventor
Werner Hofmann
Wolfgang Reichelt
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.)
SMS Siemag AG
Original Assignee
SMS Demag 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 SMS Demag AG filed Critical SMS Demag AG
Publication of EP0946760A1 publication Critical patent/EP0946760A1/de
Application granted granted Critical
Publication of EP0946760B1 publication Critical patent/EP0946760B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/08—Manufacture of cast-iron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
    • C21B13/023—Making spongy iron or liquid steel, by direct processes in shaft furnaces wherein iron or steel is obtained in a molten state
    • C21B13/026—Making spongy iron or liquid steel, by direct processes in shaft furnaces wherein iron or steel is obtained in a molten state heated electrically

Definitions

  • the invention relates to a method for producing silicon-rich Foundry iron and a direct current furnace with a centrally arranged ins Oven vessel protruding into the vicinity of the bottom and an electrode Counter electrode arranged in the bottom of the furnace vessel for carrying out the Procedure.
  • Silicon-rich foundry iron is an alloy of iron, about 3% carbon and up to 20% silicon. It is melted in foundries, for example at one Silicon content of about 2.5% around centrifugal cast iron pipes for To manufacture water pipes.
  • WO-A-94/10348 relates to the melting of scrap in a direct current furnace with a cathode 21 projecting centrally into the shaft furnace vessel 11 into the vicinity of the base and an anode 22 arranged in the base.
  • the cathode 21 is surrounded by a coaxial tube 31 , whose lower section 34 narrows conically downwards (Fig. 1).
  • Burners are arranged near the bottom of the vessel in order to melt the scrap used with the open flame in addition to the arc on the outer edge of the flat cross section.
  • the aim of the invention is to provide a method and a corresponding device create the final alloy with simple means and inexpensively of the silicon-rich foundry iron is melted.
  • the invention achieves this goal by the characterizing features of Process claim 1 and device claim 7.
  • silicon oxides and ferrous carbon metals are proposed in a shaft furnace Ferrous materials such as scrap, sponge iron, briquetted sponge iron etc. and carbonaceous feedstocks to reduce silicon oxides and Charging carburizing, feeding the batch through a ring shaft, doing it to keep in a strongly reducing atmosphere and the radiation heat, especially by a transferring arc to melt.
  • Ferrous materials such as scrap, sponge iron, briquetted sponge iron etc. and carbonaceous feedstocks to reduce silicon oxides and Charging carburizing, feeding the batch through a ring shaft, doing it to keep in a strongly reducing atmosphere and the radiation heat, especially by a transferring arc to melt.
  • the melting process conducted by electrical energy is independent of the electrical conductivity of the feed materials as well as their bed angle. Furthermore, there are no special requirements for the size of the input materials posed. For example, scrap pieces can only be used be limited by the clear width of the ring shaft.
  • the silicon oxides and independently of the normal material column come to this Material feed lances for use or a hollow electrode. This will make it possible, precisely metered amounts of silicon oxide of sufficiently fine grain size in melt as short as possible. This silicon oxide condenses further on relatively cold coal at the top of the shaft. It undergoes a transformation and is melted as the batch sinks further.
  • a downhole furnace is used to carry out the process has an annular shaft, which has a combustion chamber, the under Consideration of the angle of repose of the feed throughout Process is kept free, so that the radiant heat to the material is unhindered can be transferred.
  • the inner shaft is conical, so that the Feedstocks can be guided towards the furnace floor without hindrance.
  • the ring shaft has a size that allows the feed materials to be melted down safely.
  • a closed furnace vessel is used to carry out the method, in which maintains a strongly reducing atmosphere. This will make it possible to safely reduce the silicon oxide.
  • the silicon content of the input materials can be up to 20%.
  • Iron carriers are used: 80% scrap pieces, 10% turnings, 5% tin and 5% iron turnings.
  • the iron carriers mentioned can in a further step by iron ore or Sponge iron to be replaced.
  • a furnace vessel 11 is shown, the furnace bottom 12, in which a bottom opening 13 is provided. Furthermore, the in the furnace vessels shown in the figures have a gas vent 19.
  • the electrode 21 corresponds to a counter electrode 22 provided in the bottom 13.
  • the outer diameter of the sleeve is denoted by d and the inner diameter of the Oven vessel 11 with D,
  • the sleeve surrounding the electrode is closed with a cover 15.
  • the sleeve is conical, wherein it is at an angle ⁇ in Tapered towards the bottom of the furnace.
  • feed means 31 provided, here on the conveyor belt 33, which can be loaded via a lock 32.
  • the sleeve 14 can be displaced vertically by displacement elements 41. Furthermore, a lance 34 is provided in FIG. 2 as material supply means 31 the entry end of which is arranged a lock wheel 35. The lance 34 is also included connected to a pump 36 via which the supplied material can be conveyed pneumatically is.
  • the sleeve 14 is enveloped by a double sleeve 17.
  • the gap between the sleeves 14 and 17 is used as a material feed into which the batch Via conveyor 31, here a conveyor belt 33 is fed, which via a Lock 32 on the belt 33 is conveyable.
  • a pump 36 is still on the feeder connected.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Silicon Compounds (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
EP97918880A 1996-08-02 1997-07-25 Verfahren und vorrichtung zur erzeugung von siliziumreichen giessereiroheisen Expired - Lifetime EP0946760B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19632403A DE19632403C1 (de) 1996-08-02 1996-08-02 Verfahren und Vorrichtung zur Erzeugung von siliziumreichen Gießereiroheisen
DE19632403 1996-08-02
PCT/DE1997/001609 WO1998005800A1 (de) 1996-08-02 1997-07-25 Verfahren und vorrichtung zur erzeugung von siliziumreichen giessereiroheisen

Publications (2)

Publication Number Publication Date
EP0946760A1 EP0946760A1 (de) 1999-10-06
EP0946760B1 true EP0946760B1 (de) 2001-08-29

Family

ID=7802379

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97918880A Expired - Lifetime EP0946760B1 (de) 1996-08-02 1997-07-25 Verfahren und vorrichtung zur erzeugung von siliziumreichen giessereiroheisen

Country Status (14)

Country Link
US (1) US6235075B1 (no)
EP (1) EP0946760B1 (no)
AT (1) ATE204915T1 (no)
AU (1) AU4293997A (no)
BR (1) BR9711010A (no)
CA (1) CA2262490C (no)
CZ (1) CZ34999A3 (no)
DE (2) DE19632403C1 (no)
NO (1) NO323393B1 (no)
PL (1) PL331421A1 (no)
SK (1) SK283573B6 (no)
TW (1) TW461921B (no)
WO (1) WO1998005800A1 (no)
ZA (1) ZA976825B (no)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19755890A1 (de) * 1997-12-05 1999-06-17 Mannesmann Ag Beschickungseinrichtung für Schachtöfen
DE10346337B4 (de) * 2003-10-06 2014-06-12 Schott Ag Aggregat, ausgebildet als Schmelz- oder Läuteraggregat, Verteilersystem oder Rinnensystem für konduktiv beheizbare Glasschmelzen
DE102004061944A1 (de) * 2004-12-22 2006-07-06 Polysius Ag Verfahren und Vorrichtung zur Behandlung einer Schmelze oder Schlacke

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985545A (en) 1970-09-24 1976-10-12 Sadamu Kinoshita Metal melting method using electric arc furnace
DE2342959B1 (de) * 1973-08-25 1975-02-13 Kloeckner Werke Ag Vorrichtung zur kontinuierlichen Erzeugung von Stahl aus Erz
AUPM792594A0 (en) 1994-09-05 1994-09-29 Illawarra Technology Corporation Limited, The Smelting ferrous materials
DE4236510C2 (de) * 1992-10-26 1996-05-30 Mannesmann Ag Vorrichtung zum Einschmelzen von Schrott
US5588982A (en) * 1995-05-01 1996-12-31 Alabama Power Company Process for producing foudry iron

Also Published As

Publication number Publication date
US6235075B1 (en) 2001-05-22
DE59704480D1 (de) 2001-10-04
AU4293997A (en) 1998-02-25
ATE204915T1 (de) 2001-09-15
CA2262490C (en) 2008-10-14
SK283573B6 (sk) 2003-09-11
NO323393B1 (no) 2007-04-23
BR9711010A (pt) 1999-08-17
WO1998005800A1 (de) 1998-02-12
EP0946760A1 (de) 1999-10-06
NO990439L (no) 1999-01-29
ZA976825B (en) 1998-02-11
PL331421A1 (en) 1999-07-19
CZ34999A3 (cs) 1999-05-12
DE19632403C1 (de) 1998-03-26
TW461921B (en) 2001-11-01
CA2262490A1 (en) 1998-02-12
SK12899A3 (en) 1999-07-12
NO990439D0 (no) 1999-01-29

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