EP0678584A1 - Installation pour insuffler du gaz dans les parois d'un récipient métallurgique - Google Patents

Installation pour insuffler du gaz dans les parois d'un récipient métallurgique Download PDF

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Publication number
EP0678584A1
EP0678584A1 EP95100728A EP95100728A EP0678584A1 EP 0678584 A1 EP0678584 A1 EP 0678584A1 EP 95100728 A EP95100728 A EP 95100728A EP 95100728 A EP95100728 A EP 95100728A EP 0678584 A1 EP0678584 A1 EP 0678584A1
Authority
EP
European Patent Office
Prior art keywords
gas
gas purging
inserts
purging
insert
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.)
Granted
Application number
EP95100728A
Other languages
German (de)
English (en)
Other versions
EP0678584B1 (fr
Inventor
Alfred Ing. Reiterer
Günther Ing. Nemecz
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.)
Veitsch Radex GmbH and Co OG
Original Assignee
Veitsch Radex GmbH and Co OG
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 Veitsch Radex GmbH and Co OG filed Critical Veitsch Radex GmbH and Co OG
Publication of EP0678584A1 publication Critical patent/EP0678584A1/fr
Application granted granted Critical
Publication of EP0678584B1 publication Critical patent/EP0678584B1/fr
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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/48—Bottoms or tuyéres of converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ

Definitions

  • the invention relates to a gas purging device for wall-side installation in a metallurgical melting vessel.
  • metallurgical melting vessel includes those metallurgical vessels in which metal is melted or liquid metal is treated.
  • Such individual gas purging stones can be installed both in the floor and in the wall area of a metallurgical melting vessel. This is usually done using a so-called perforated brick; but also the direct installation of a gas purging plug in a monolithic lining is part of the prior art.
  • sink stones with "non-directional porosity” With the joint washer, the gas is supplied via an annular gap between a dense ceramic body and the enveloping sheet metal jacket.
  • Flushing stones with so-called “non-directional porosity” are characterized by a refractory material of open porosity through which the flushing gas is passed.
  • Gas purging stones with "directed porosity” are characterized by a large number of channels with a small diameter in a dense refractory matrix, the gas being transported along the channels.
  • This gas purging plug known from DE 39 11 881 C1, is to be used in particular in a vacuum vessel for carrying out an RH, DH or RH-OB degassing process.
  • the installation takes place on the wall side above the so-called Proboscis of the vacuum vessel.
  • gas purging stones for the mentioned field of application are therefore designed as so-called slot purgers, that is to say that the directed pores have a slot shape and not an annular shape like the tubes.
  • the surface tension of the molten metal is usually so great that infiltration into the slit-shaped channels is practically impossible. This also applies if the gas supply is switched off.
  • the purging gas then enters the steel column in larger bubbles and at low pressure and flows up the inner wall of the trunk and not in the center of the molten metal.
  • the problem underlying the invention is therefore to provide a gas purging device which, when installed on the wall, ensures a uniform gas supply into the molten metal, as deep as possible into the molten metal, so that a homogeneous gas distribution in the molten metal is achieved.
  • the invention is initially based on the consideration that this goal can be achieved by arranging a plurality of gas purging stones at a distance from one another, via which the treatment gas can be introduced into the molten metal at different depths.
  • a gas purging insert can be designed such that the gas introduced into the molten metal flows upwards on the wall immediately after it exits the gas purging insert, while another gas purging insert is designed so that the gas is guided deep into the molten metal. Additional gas purging inserts can supply gas to the area between the two aforementioned gas purging inserts.
  • the invention then relates to a gas purging device for wall-side installation in a metallurgical melting vessel, such as a vacuum vessel for carrying out an RH, DH or RH-OB degassing process, which is constructed as follows:
  • the gas purging device consists of a base body made of a refractory, ceramic material.
  • At least two gas purging inserts are spaced one above the other and have at least one of the following features: Either the gas purging inserts have the same construction, but a different cross-sectional area at the gas outlet end. As a result, the gas emerges from the gas purging plug with a larger cross-sectional area with a lower flow rate than from a gas purging insert with a smaller cross-sectional area. Accordingly, the treatment gas penetrates more or less deeply into the molten metal.
  • the gas purging inserts are constructed differently in terms of construction. Constructive means that they differ in their structural structure. For example, a gas purging insert with non-directional porosity and a gas purging insert with directional porosity can be formed. Starting from the same gas supply quantity and the same gas pressure, the gas purging plug with undirected porosity will then press the treatment gas into the molten metal under less pressure than the gas purging insert with directed porosity.
  • a gas purging insert with directed porosity makes sense to design it as a so-called slot flushing device, that is to say to design the individual pore channels with a rectangular cross section, the width usually not exceeding 1 mm.
  • the risk of going to the edge described at the beginning is reduced or eliminated in that the gas purging inserts are covered with sheet metal.
  • the gas purging inserts can be pre-assembled with a sheet metal jacket in a corresponding opening in the gas purging device and are fixed there, for example, with a mortar.
  • a gas distribution chamber can directly connect to the sheet metal jacket of the gas purging insert, specifically at the end on the gas inlet side.
  • a gas distribution chamber for example, from a metal box is formed, can be individually designed for each gas purging insert; however, it is also within the scope of the invention to provide a common gas distribution chamber for all gas purging inserts, thereby reducing the manufacturing outlay.
  • the metal frame of the gas distribution chamber connects directly to the sheet metal jacket of the gas purging inserts, so that gas diffusions into the ceramic matrix material of the gas purging device are reliably avoided.
  • a gas purging plug for use in metallurgical melting vessels is known, which is divided into individual, gas-tight sections separated from one another and can be connected to one or more gas supply lines.
  • this gas purging stone it is important that the individual sections can be switched on one after the other so that the gas purging device as a whole can be used for longer and that 40 or 50 batches can also be run with a gas purging device without repair or exchange measures.
  • the gas purging device according to the invention is designed such that gas is generally applied to the individual gas purging sections at the same time, but the gas emerging from the individual gas purging inserts penetrates to different depths into the metal melt due to the measures described above.
  • FIG. 1 shows a base body 10 made of a refractory, ceramic material, which has a trapezoidal cross section.
  • Each of the gas purging inserts 14a-e is covered with sheet metal on the circumference, as shown in FIG. 3, and is connected at the gas inlet end (at 16) to a common gas distribution chamber 18, which extends over the entire bottom region 10b of the base body 10 and consists of a metal box which has an opening 20 (with a neck) for central gas supply (at 16).
  • the metallic frame of the gas distribution chamber 18 directly adjoins the sheet metal casing 22, so that between the gas supply (at 16) and the gas outlet end (at 24) is completely gas-tight with respect to the base body 10, so that the gas cannot diffuse into the base body 10, but rather can be guided directly into the molten metal via the gas distribution chamber 18 and the gas purging inserts 14a-e.
  • the gas purging insert 14a has an undirected porosity, which is shown schematically here by hatching.
  • the gas purging inserts 14b-e are so-called slot flushers, the gas purging insert 14b having five slots, the gas purging insert 14c having four slots and the gas purging inserts 14d and e each having three slots.
  • the slot size (cross-sectional area of the slots) is continuously decreasing from the gas purging insert 14b to the gas purging insert 14e.
  • the gas purging insert 14b not only has five slots, but rather they are also designed with a larger cross section than the four slots of the gas purging insert 14c and the three slots of the gas purging insert 14d are smaller than the slots of the gas purging insert 14c, but larger than that the gas purging insert 14e.
  • the increased number of slots and the larger opening width of the slots in the gas purging insert 14b ensure that the gas penetrates somewhat more deeply into the molten metal than the gas supplied via the gas purging insert 14a.
  • the penetration depth of the gas in the gas purging insert 14c is again somewhat larger than in 14b, but smaller than in the gas purging insert 14d.
  • the gas purging insert 14e which has only three slots with a very small cross-section, ensures that the gas with the greatest penetration depth can be guided into the molten metal from here.
  • the height of the vertically installed base body 10, for example in an RH vacuum vessel ensures that the gas supply takes place practically continuously over the entire molten metal and thus a uniform metallurgical treatment can take place.
  • the steel speed in the inlet nozzle of the RH vacuum vessel is kept the same across the entire cross-section, i.e. it is approximately the same in the edge area as in the center.
  • gas purging devices of the type mentioned can be installed in both proboscis (dip tubes) and acted on alternately.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP95100728A 1994-03-25 1995-01-20 Installation pour insuffler du gaz dans les parois d'un récipient métallurgique Expired - Lifetime EP0678584B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4410289 1994-03-25
DE4410289A DE4410289C1 (de) 1994-03-25 1994-03-25 Gasspüleinrichtung zum wandseitigen Einbau in metallurgische Schmelzgefäße

Publications (2)

Publication Number Publication Date
EP0678584A1 true EP0678584A1 (fr) 1995-10-25
EP0678584B1 EP0678584B1 (fr) 1999-09-29

Family

ID=6513775

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95100728A Expired - Lifetime EP0678584B1 (fr) 1994-03-25 1995-01-20 Installation pour insuffler du gaz dans les parois d'un récipient métallurgique

Country Status (7)

Country Link
US (1) US5622673A (fr)
EP (1) EP0678584B1 (fr)
JP (1) JPH07268441A (fr)
AT (1) ATE185167T1 (fr)
CA (1) CA2145360C (fr)
DE (1) DE4410289C1 (fr)
ES (1) ES2139100T3 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0221250A1 (fr) * 1985-10-30 1987-05-13 Didier-Werke Ag Dispositif d'injection pour récipients métallurgiques
US4815715A (en) * 1986-10-09 1989-03-28 Didier-Werke Ag Gas purging assembly for supplying gas to molten metal in a metallurgical vessel
DE3911881C1 (en) * 1989-04-11 1990-08-09 Radex-Heraklith Industriebeteiligungs Ag, Wien, At Fired gas flushing brick - for decarburisation of molten steel in vacuum vessel, comprises ceramic parallel tube lets
DE4201748A1 (de) * 1992-01-23 1993-07-29 Intocast Gmbh Verfahren zur herstellung der feuerfesten zustellung einer giesspfanne

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3716388C1 (de) * 1987-05-15 1988-10-27 Radex Deutschland Ag Gasspuelstein
US4858894A (en) * 1988-06-30 1989-08-22 Labate M D Stirring block with unidirectional grain structure having improved erosion resistance
DE4014509A1 (de) * 1990-05-07 1991-11-14 Didier Werke Ag Gasspueler

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0221250A1 (fr) * 1985-10-30 1987-05-13 Didier-Werke Ag Dispositif d'injection pour récipients métallurgiques
US4815715A (en) * 1986-10-09 1989-03-28 Didier-Werke Ag Gas purging assembly for supplying gas to molten metal in a metallurgical vessel
DE3911881C1 (en) * 1989-04-11 1990-08-09 Radex-Heraklith Industriebeteiligungs Ag, Wien, At Fired gas flushing brick - for decarburisation of molten steel in vacuum vessel, comprises ceramic parallel tube lets
DE4201748A1 (de) * 1992-01-23 1993-07-29 Intocast Gmbh Verfahren zur herstellung der feuerfesten zustellung einer giesspfanne

Also Published As

Publication number Publication date
CA2145360A1 (fr) 1995-09-26
ATE185167T1 (de) 1999-10-15
JPH07268441A (ja) 1995-10-17
ES2139100T3 (es) 2000-02-01
CA2145360C (fr) 2000-01-11
DE4410289C1 (de) 1995-03-16
EP0678584B1 (fr) 1999-09-29
US5622673A (en) 1997-04-22

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