EP0290766A2 - Brique pour lavage au gaz - Google Patents

Brique pour lavage au gaz Download PDF

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Publication number
EP0290766A2
EP0290766A2 EP88104934A EP88104934A EP0290766A2 EP 0290766 A2 EP0290766 A2 EP 0290766A2 EP 88104934 A EP88104934 A EP 88104934A EP 88104934 A EP88104934 A EP 88104934A EP 0290766 A2 EP0290766 A2 EP 0290766A2
Authority
EP
European Patent Office
Prior art keywords
gas
purging plug
gas purging
plug according
sheet metal
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
EP88104934A
Other languages
German (de)
English (en)
Other versions
EP0290766B1 (fr
EP0290766A3 (en
Inventor
Lorenz Dötsch
Louis Retrayt
Herbert Schäfer
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.)
RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE
Original Assignee
RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE
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 RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE filed Critical RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE
Priority to AT88104934T priority Critical patent/ATE54175T1/de
Publication of EP0290766A2 publication Critical patent/EP0290766A2/fr
Publication of EP0290766A3 publication Critical patent/EP0290766A3/de
Application granted granted Critical
Publication of EP0290766B1 publication Critical patent/EP0290766B1/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

Definitions

  • the invention relates to a gas purging plug for blowing inert purging gases and / or solids into metallurgical vessels, such as converters or pans for treating or producing high-quality metal.
  • inert gas purging via blow stones which are installed in the refractory lining of the metallurgical melting vessel
  • two types of installation can be distinguished, purging prevailing in the bottom region of the melting vessel, while purging stones are used less frequently in the side wall.
  • the invention is not subject to any limitation.
  • gas flushing blocks may be mentioned, as are described, for example, in German Offenlegungsschriften 35 31 533, 35 31 534, 35 20 207 or 35 27 793.
  • the RADEX-Rundschau, 1987, pp. 288 to 302 provides a comprehensive overview.
  • the following different types of sink are currently being used: so-called joint washers, sink stones with "undirected porosity” and sink stones with “directed porosity”.
  • the gas is supplied via an annular gap between a dense ceramic body, in particular a cone, and the enveloping sheet metal jacket.
  • Flushing stones with so-called “non-directional porosity” are characterized by a refractory material with high open porosity, through which the inert flushing gas is pressed.
  • Gas purging plugs with "directed porosity” are characterized by a large number of channels with a small diameter in a dense, fire-resistant matrix, the gas being transported along the channels. In this respect, the invention is also not restricted.
  • Gas purging plugs with "directed porosity” have proven to be preferred in terms of their erosion and infiltration resistance. According to RADEX-Rundschau (op. Cit.), Gas flushing blocks with undirected porosity can achieve about ten batches, while a stone with directional porosity has a stability of up to twenty batches with much greater residual strength.
  • gas flushing stones with a conical shape have also proven particularly useful.
  • the gas purging plug must be broken out of the perforated brick surrounding it, which may damage the perforated brick.
  • Such a structure is complicated and requires that when installing a new sink in an already worn perforated brick, this must also be provided with a new sleeve.
  • the invention has for its object to provide a gas purging plug, which makes it possible to carry out the gas and / or solid treatment of the gas melt over a complete cycle, that is, the gas purging plug should have such a durability that it can be used, for example, in a pan holds 40 to 50 batches and possibly more without repair or exchange measures.
  • the gas purging plug should preferably be designed in such a way that it also enables the gas and / or solid quantities carried out to be adapted depending on the desired melt treatment.
  • the invention is based on the knowledge that this goal can be achieved by dividing the gas purging plug into individual, independent zones.
  • melt treatment can therefore be maintained unchanged over a double, triple, quadruple or multiple time period.
  • the invention relates to a gas purging plug for metallurgical melting vessels, which is characterized in that the area of the gas purging plug which is effective for gas and / or solid passage is divided into sections which are separated from one another by at least one, largely gas-impermeable and in the direction of the gas or solid flow can be connected independently or in any assignment to one or more supply lines for the gas and / or the solid.
  • the intermediate member can be a metal sheet which, for example, divides a frustoconical gas purging plug into two semi-truncated sections, the metal sheet preferably is also connected gastight to the sheet metal casing.
  • the gas purging plug corresponds overall to a gas purging plug according to the prior art in terms of its shape and external dimensions, but is divided into two sections by the central sheet metal wall, each of which forms its own gas purging plug (section).
  • Each section can be supplied with gas individually, for example by each section having its own gas supply line.
  • the gas supply lines can also be connected to a central gas supply line via a corresponding intermediate element and can then be acted upon alternately with gas, for example via an actuator.
  • a section of an inert gas preferably argon
  • the supply line is switched off or the actuator is switched to the other supply line, and the gas purging can continue without interruption via the second section, while, for example, the first section freezes after infiltration of the molten metal and is therefore inoperable becomes. This increases the service life of the sink by twice.
  • the second section can also be switched to the first section by switching the actuator, whereby the gas purging capacity can be doubled for a short time or permanently if required.
  • a gas purging plug according to the invention can not only be divided into two sections, but basically any number of sections, for example by two cross-shaped metal sheets in four equal sections. As a result, the service life of the sink can be quadrupled.
  • the metallic partitions ensure that gas exchange between the sections is reliably avoided.
  • the gas can therefore be blown into the metallurgical melting vessel.
  • any other material that is sufficiently gas-tight can also be used.
  • the invention thus proposes to form the intermediate member from a largely gas-impermeable, refractory, ceramic material, the same effects being achieved as with a metal sheet.
  • the porous, gas-permeable gas purging plug with a sheet metal casing which consists of a sheet metal jacket which surrounds the peripheral surface of the gas purging plug and which surrounds the metallurgical melting vessel facing end face of the gas purging plug is pulled around with the formation of a corresponding metallic floor, the gas permeable gas purging plug, or in the case of a joint purging device, the gas-tight middle part being arranged at a distance from this floor by means of corresponding spacers with the formation of a pressure chamber.
  • each of these sections of the gas pressure chamber has its own gas supply line, the gas supply lines in turn - as shown above - can open into a central gas supply line via a corresponding intermediate member, through which one or more or all gas pressure chamber sections can be acted upon with gas.
  • the intermediate pieces can run straight as well as - according to an advantageous embodiment - for example in the form of sleeves.
  • a gas purging plug which then subdivide the gas purging plug, for example, into cylindrical or frustoconical sections, the connection of the associated gas line analogously projecting Executions are carried out.
  • This embodiment then resembles a "drum turret", the "cartridge receptacle” being formed by the gas-permeable sections which are not covered by the gas-tight sleeves.
  • the “matrix material” remaining between these sections from largely gas-impermeable refractory ceramic material, in which the gas-permeable sections then lie.
  • separate sheet metal casings around the sections can be dispensed with, but need not be.
  • the matrix material is produced from the same material from which the perforated brick is formed in the prior art. It is then possible to virtually form the gas purging plug integrally with the perforated brick, that is to say to select the gas purging plug in its geometrical dimensions in such a way that a separate perforated brick can be dispensed with, so that the gas purging plug itself also takes over the function of the perforated brick.
  • the service life of the sink can be increased many times over by the inventive design of the sink and it is easily possible to achieve service lives which correspond to those of the shelf life of the metallurgical vessel (for example the pan). Since the perforated brick also has to be replaced when the floor is renewed, this embodiment achieves a considerable reduction in the delivery work because the gas flushing brick itself now forms the perforated brick. Above all, a separate perforated stone sleeve can also be dispensed with.
  • the measures according to the invention can also be implemented in so-called joint washers, the intermediate pieces then dividing the ring channel into corresponding sections.
  • a gas purging plug is numbered 10, which consists of a porous, gas-permeable refractory ceramic material, for example based on 97 wt .-% Al2O3.
  • the gas purging plug has a truncated cone shape.
  • a sheet metal casing 12 comprises a sheet metal jacket 14 extending around the peripheral surface of the gas purging plug 10 and a circular base covering the lower, larger area, which is welded gas-tight to the sheet metal jacket 14 on its outer circumference.
  • the gas purging plug 10 is in the gas by means of a mortar layer 13 tight sheet metal casing 12 inserted.
  • the metal sheets 16, 18 are also welded gas-tight to the sheet metal jacket 14 or the floor.
  • Each of the sections 22, 24, 26, 28 is formed in its bottom region with its own gas connection line 32, which is welded to the bottom in a gas-tight manner.
  • the gas purging plug shown in FIG. 2 is again frustoconical and designed with a sheet metal cladding 12 analogous to the embodiment according to FIG. 1.
  • gas purging sections 22, 24, 26, 28, which are separate from one another and spaced apart, are formed within the gas-permeable refractory material 34.
  • the sections 22, 24, 26, 28 are each surrounded by a metal sleeve 30.
  • the section 22 is frustoconical, the section 24 as a triangular in cross-section, the section 26 as a square in cross-section Sleeve and the section 28 as a hexagonal sleeve in cross section, which may also have a taper.
  • the sleeves are gas-tightly welded to the (not shown) bottom of the sheet metal casing 12 on the side facing away from the metallurgical melting vessel, and the sections are each connected to a gas line 32 (shown in broken lines).
  • the metal sleeves run from the floor to slightly below the opposite end face of the gas purging plug.
  • the material within the metal sleeves is the same gas permeable refractory material as that between the sleeves, which is identified by reference numeral 34.
  • This "matrix material" 34 can be formed on the bottom side with its own gas connection 32, the gas flow then running inside the sheet metal jacket 12 and between the sleeves 30, while the gas flow fed inside the sleeves 30 also runs only within these sleeves.
  • the gas purging plug according to the invention shown in Figure 3 is designed as a perforated brick. It accordingly has a cuboid shape with a square cross section, and the matrix material 35 consists of a gas-tight, refractory ceramic material, for example based on zirconium dioxide.
  • a corresponding mold is filled with a refractory mass (slip) for manufacture. After hardening, four frustoconical sections 22, 24, 26, 28, spaced apart from one another, are drilled out. Corresponding inserts made of a conventional gas-permeable refractory material are then mortared into this.
  • the slip before filling the slip, to place corresponding frustoconical metal sleeves on the bottom of the mold and then only fill the area between the sleeves with the slip.
  • the sleeves can be filled with the gas-permeable refractory material beforehand, or corresponding inserts can be mortared into the sleeves, but the inserts can also be mortared into the sleeves afterwards.
  • the perforated brick is preferably formed on the bottom side, that is to say at its end facing away from the melting vessel, with a metal trough surrounding the perforated brick, into which four gas lines 32 (shown in dashed lines) open within sections 22, 24, 26, 28.
  • the gas purging plug 10 again has the shape of a truncated cone and is provided with a sheet metal cladding 12 analogous to the exemplary embodiment in accordance with FIG. However, this runs here both on the circumferential side and on the bottom side at a distance from the gas-tight material of the gas flushing block, the distance 36 between the sheet metal casing 12 and the gas-tight material 35 being formed by a diagonally running sheet metal wall 38 which is opposite the sheet metal jacket 14 and the floor is welded gas-tight.
  • annular channel-shaped region 36 and the material 35 are divided into two sections 22, 24, which are separated from one another in a gastight manner.
  • two gas lines 32 which are welded gas-tight to the floor, open into the sheet metal floor.
  • sheet metal wall 38 instead of a sheet metal wall 38 according to FIG. 1, two sheet metal walls, and then preferably perpendicular to one another, could also be provided to form four sections with correspondingly four gas lines.
  • the frustoconical gas purging plug 10 is likewise surrounded by a sheet metal cladding 12, consisting of a sheet metal jacket 14 and a bottom 40, on the circumferential and bottom sides.
  • the gas purging plug is divided into two sections 22, 24 by a sheet metal wall 38, which is welded gas-tight to the edge of the sheet metal casing 12.
  • the sheet metal wall 38 projects beyond the lower end face 42 of the gas-permeable material to form two pressure chamber sections 44, 46 which are separated from one another in a gastight manner.
  • a gas line 32 opens into each of the pressure chamber sections 44, 46 an intermediate piece 48 in a central gas supply line 50, and an actuator 52 is arranged in the intermediate piece 48, which blocks the gas path into the pressure chamber section 44 in the position shown and only releases the gas path into the pressure chamber section 46.
  • the actuator can be easily Swiveling into the position shown in dashed lines can be pivoted to block the gas path to the pressure chamber section 46, whereby the gas path in the pressure chamber section 44 is released at the same time.
  • both gas lines 32 are supplied with inert gas, for example argon, from the central gas supply line 50.
  • gas-permeable sections 22, 24, 26, 28 can be designed with both directed and undirected porosity.
  • the gas lines 32 according to FIGS. 1 to 4 can also open into a common intermediate piece 48 and thus a central gas supply line 50.
  • gas purging plugs according to the embodiments of Figures 1, 2, 4 and 5 in a conventional manner, optionally with the interposition of a perforated stone sleeve, as described in the RADEX Rundschau (loc. Cit.), Inserted in a perforated stone in the bottom or the wall of a metallurgical melting vessel 3, the gas purging plug according to FIG. 3 is inserted into the bottom lining of the metallurgical vessel like a perforated block, the function of which it also takes on.
  • the gas treatment then takes place as follows, for example:
  • the gas line 32 of the section 22 is switched on, that is to say the inert gas flows through the section 22 in the same way as in the case of a conventional gas purging plug into the molten metal.
  • the remaining sections 24, 26, 28 initially remain without function.
  • the associated gas line 32 is closed and, at the same time or shortly before (see explanations for FIG. 5), the second section 24 via the associated section Gas line 32 charged with gas.
  • the gas treatment therefore continues without interruption.
  • some molten metal will likely penetrate section 22 and freeze there, rendering this section inoperable.
  • section 24 is also worn, a switch is made to section 26 and then to section 28 as described above.
  • a gas purging plug section 22, 24, 26, 28 or 34 according to the invention also holds ten to twenty batches.
  • the service life of a gas purging plug according to the invention is thus increased by two, three, four or five times, that is to say here, for example, to 40 to 100 batches by appropriate switching to the further sections.
  • the service life of a gas purging plug according to the invention thus lies in the area of floor durability, for example a pan or even above it, so that reserves are also made available in this regard.
  • each of the sections 22, 24, 26, 28 (or in the exemplary embodiment according to FIG. 2 additionally the matrix material 34) has sufficient gas permeability in order to be able to carry out the desired gas flow. This can easily be achieved by means of a corresponding open pore volume or a corresponding number of channels ("directed porosity") or joints.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Sampling And Sample Adjustment (AREA)
EP88104934A 1987-05-15 1988-03-26 Brique pour lavage au gaz Expired - Lifetime EP0290766B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88104934T ATE54175T1 (de) 1987-05-15 1988-03-26 Gasspuelstein.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3716388 1987-05-15
DE3716388A DE3716388C1 (de) 1987-05-15 1987-05-15 Gasspuelstein

Publications (3)

Publication Number Publication Date
EP0290766A2 true EP0290766A2 (fr) 1988-11-17
EP0290766A3 EP0290766A3 (en) 1989-06-28
EP0290766B1 EP0290766B1 (fr) 1990-06-27

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ID=6327686

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88104934A Expired - Lifetime EP0290766B1 (fr) 1987-05-15 1988-03-26 Brique pour lavage au gaz

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EP (1) EP0290766B1 (fr)
AT (1) ATE54175T1 (fr)
DE (1) DE3716388C1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456001A2 (fr) * 1990-05-07 1991-11-13 Didier-Werke Ag Installation de barbotage par gaz
US7276205B2 (en) 2002-06-07 2007-10-02 Vesuvius Crucible Company Injection device and process for the injection of a fluid

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4103837A1 (de) * 1991-02-08 1992-08-13 Plibrico Gmbh Einblasvorrichtung fuer ein metallurgisches gefaess
DE4406563A1 (de) * 1994-02-23 1995-08-24 Matthias Keuter Düsenrohr für blasende Sauerstoffaufblas-Konverter
DE4410289C1 (de) * 1994-03-25 1995-03-16 Veitsch Radex Ag Gasspüleinrichtung zum wandseitigen Einbau in metallurgische Schmelzgefäße
DE102008029934B3 (de) * 2008-06-26 2009-06-10 Refractory Intellectual Property Gmbh & Co. Kg Feuerfester keramischer Gasspülstein
DE102010007126B3 (de) * 2010-02-05 2011-07-07 Refractory Intellectual Property Gmbh & Co. Kg Gasspüleinrichtung
EP2868404A1 (fr) 2013-10-29 2015-05-06 Refractory Intellectual Property GmbH & Co. KG Système de balayage à gaz pour fontes haute température

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU82051A1 (fr) * 1980-01-02 1981-09-10 Arbed Equipement du fond d'un recipient metallurgique pour l'injection de gaz dans un bain de metal
EP0043787A1 (fr) * 1980-07-09 1982-01-13 Arbed S.A. Elément réfractaire perméable aux gaz
DE3527793A1 (de) * 1985-08-02 1987-02-12 Esb Schweissbetrieb Burbach & Verfahren zur montage eines fuer metallurgische gefaesse vorgesehenen gasspuelsteins
DE3531533A1 (de) * 1985-09-04 1987-02-19 Halomet Ag Gasspuelstein fuer metallurgische gefaesse
DE3531534A1 (de) * 1985-08-09 1987-02-19 Halomet Ag Gasspuelstein fuer metallurgische gefaesse
DE3520207C2 (fr) * 1985-06-05 1987-04-09 Didier-Werke Ag, 6200 Wiesbaden, De
DE3634448A1 (de) * 1986-10-09 1988-04-21 Didier Werke Ag Spueleinrichtung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3538498A1 (de) * 1985-10-30 1987-05-07 Didier Werke Ag Einduesvorrichtung fuer metallurgische gefaesse

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU82051A1 (fr) * 1980-01-02 1981-09-10 Arbed Equipement du fond d'un recipient metallurgique pour l'injection de gaz dans un bain de metal
EP0043787A1 (fr) * 1980-07-09 1982-01-13 Arbed S.A. Elément réfractaire perméable aux gaz
DE3520207C2 (fr) * 1985-06-05 1987-04-09 Didier-Werke Ag, 6200 Wiesbaden, De
DE3527793A1 (de) * 1985-08-02 1987-02-12 Esb Schweissbetrieb Burbach & Verfahren zur montage eines fuer metallurgische gefaesse vorgesehenen gasspuelsteins
DE3531534A1 (de) * 1985-08-09 1987-02-19 Halomet Ag Gasspuelstein fuer metallurgische gefaesse
DE3531533A1 (de) * 1985-09-04 1987-02-19 Halomet Ag Gasspuelstein fuer metallurgische gefaesse
DE3634448A1 (de) * 1986-10-09 1988-04-21 Didier Werke Ag Spueleinrichtung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN *
Patent Abstracts of Japan, Band 7, Nr. 175 (C-179)(1320), 03.08.1983 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456001A2 (fr) * 1990-05-07 1991-11-13 Didier-Werke Ag Installation de barbotage par gaz
EP0456001A3 (en) * 1990-05-07 1992-12-09 Didier-Werke Ag Device for gas flushing
US7276205B2 (en) 2002-06-07 2007-10-02 Vesuvius Crucible Company Injection device and process for the injection of a fluid

Also Published As

Publication number Publication date
DE3716388C1 (de) 1988-10-27
ATE54175T1 (de) 1990-07-15
EP0290766B1 (fr) 1990-06-27
EP0290766A3 (en) 1989-06-28

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