Classifications

• • 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
• • 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
  • 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
  • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
  • C21C7/04—Removing impurities by adding a treating agent
  • C21C7/072—Treatment with gases
• • 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 tray for metallurgical vessels, in particular for steel production.
• So-called gas purging stones in the form of discrete gas purging elements are known. These are built into the wall or floor of a metallurgical vessel (pan, tundish, converter, evacuation vessel, etc.). There are various designs: with directed or undirected porosity (for example EP 0 521 371 B1), so-called slot and joint washers, so-called labyrinth washers (for example DE 37 27 938 Cl) etc.
• gas spooling devices belong to the prior art, which are an integral part of a base or a wall of a metallurgical vessel.
• rod-shaped bodies are embedded in the refractory stove construction mass, which consist of porous material or of a material whose thermal expansion behavior is different from the stove construction mass, so that in operation (with appropriate heating) “expansion cracks "or” slots "arise along which the gas can flow.
• the disadvantage is a gas flow quantity that is difficult to control.
• the invention further develops the basic idea of the above-mentioned prior art (formation of a gas purging device as an integral part of a refractory lining of a metallurgical vessel) and offers a gas purging base for metallurgical vessels with directed porosity, which is within part or all of the refractory lining of the vessel is trained.
• the directional porosity in the form of channels, slots or the like
• the type and size of the gas purging device can be varied almost as desired.
• the area over which gas is injected into the molten metal can be set as well as the amount of gas.
• the refractory lining including the gas purging device, can be completely or partially prefabricated as a prefabricated component (s).
• the type of directed porosity can be set as desired.
• a gas distribution chamber can be formed as part of the refractory lining or outside (for example as part of the metallic shell of a metallurgical vessel).
• the invention relates to a gas purging tray for metallurgical vessels with a monolithic refractory ceramic lining, in which channels are formed by chemical or physical processes, which at their end, which is assigned to an adjacent vessel wall, for direct or indirect fluidic engineering Connection with a gas supply line are formed and at their other end in the corresponding cover layer of the refractory ceramic lining.
• channel is to be understood in its most general meaning, which is not subject to any restrictions with regard to its geometry, that is to say includes, among other things, tube-like, slot-like, ring channel-like, network-like or step-like channels.
• the channels can be formed by chemical or physical processes. Above all, this includes the melting or burning out of appropriate inserts (with a shape corresponding to the course of the channel) from appropriate materials, but also, for example, the formation of the channels using laser technology (laser cutting).
• the inserts can accordingly consist of fibrous, tubular, plate-like, net-like or step-like elements which are mixed or inserted into a refractory ceramic mass during or after their production.
• the deposits can be distributed regularly or irregularly within the ceramic mass. Considering the cross section of a complete base of a metallurgical vessel, zones with different designs or distributions of the gas channels can also be created. For example, a larger number of rinsing channels can be provided in the center than in the edge region of the floor.
• the ceramic lining can consist of standard types and be gas-tight, since the gas permeability is achieved via the channels within the lining. This promotes good soil durability.
• the flow connection of the gas supply line to the channels can be made in different ways:
• the gas supply line can be coupled directly to the inlet end of the channels. Such a form is used, for example, when the channels run from a common connection area. Such a connection is shown schematically in section in FIG.
• the gas supply line can be run as a gas-tight supply line up to the upper edge of any permanent feed of the metallurgical vessel. However, it can, for example, also be connected directly to the metal jacket of the vessel or a coupling point arranged on the bottom, for example screwed on. The gas is then passed on, for example, through corresponding lines in the permanent feed to the channels of the monolithic floor feed.
• a gas distribution element can be arranged between the end of the gas supply line on the gas outlet side and corresponding ends of the channels on the gas inlet side, as shown schematically in section in FIGS. 1 to 1.
• this distribution element can also be formed, for example, by a chemical and / or thermal reaction (decomposition / melting) of a corresponding insert (FIG. 1c). However, it can also consist of a durable material, for example metal (FIG. 1d).
• the insert consists of paper, cardboard, plastic or the like, for example, after the insert has burnt out (the term burn-out stands for any type of removal of the insert), a direct electrical connection to the gas supply can be achieved. This eliminates the need to arrange separate gas distribution chambers, although this is possible (Fig. Lc to le).
• the insert can also be perforated so that the refractory matrix material first penetrates and later (after the insert has burned out) a labyrinthine structure of the winding channel or channels is created.
• the flushing slots simultaneously fulfill the function of expansion joints within the monolithic refractory component, and thus a helpful additional function.
• a perforated, perforated, checkerboard-like or step-like design of the corresponding inserts (with corresponding openings) - as shown schematically in FIG. 2 as a supervision - enables the following to be achieved:
• the insert is cast vertically with refractory material over the entire height.
• the hatched sections Gl, G2, ... Gn consist of a burn-out plastic, the intermediate sections are recesses of the insert, which are filled with refractory material accordingly.
• the bottom-side fields Gl are plugged onto a rail-like end S of a gas supply line L which, after the hatched fields Gl, G2 ... Gn have burnt out, creates a continuous gas flow from the end of the gas supply line via the sections Gl, G2, ... Gn into the molten metal , the gas flowing through the fields G1.2, G2.3, G3.2 and Gn.3 one after the other.
• Connecting sections V create a fluidic connection between adjacent sections (for example G1.2-G2.3; G2.3-G3.2 etc.) after removal of the insert.
• the cross-sectional area at the gas outlet end is defined by the sections Gn.l + Gn.2 + Gn.3 determined. If the flushing floor is worn up to row G3, there is still a cross-sectional area corresponding to row Gn for the gas outlet available via rows G2.1 to G2.3. It is obvious that the same result can also be achieved with modified geometrical shapes of the insert (s), for example a step-like course of the fields / recesses.
• connection area of the gas supply line and channels can be made on or in the refractory lining. It can also be formed on the metallic outer jacket of the metallurgical vessel, as shown schematically in FIGS. 1c, d.
• connection of the channels to the gas supply line can be supported by means (adapter) for fastening the insert (s) to the gas supply line.
• Figures 3 and 4 show examples of this.
• the gas supply line possibly including the aforementioned adapter
• the insert (s) which can be connected to it if necessary, no further parts are necessary for the formation of the purge gas line or purge gas channels.
• the production is simplified. This applies in particular to gas purging devices in which the refractory ceramic matrix material is poured onto or around the aforementioned parts.
• the gas supply line if necessary, the adapter
• the insert (s) are positioned and then cast with mass.
• the inlays are mixed (distributed) with (in) the mass and made into a floor or wall (possibly a floor or wall segment) and then inserted into the metal jacket of the metallurgical vessel and the inlays (or already formed channels) to the Gas supply connected.
• the adapter mentioned can be an integral part of the gas outlet end of the gas supply line. It can, for example, consist of an external thread or a There is a bayonet lock, the body being screwed or pushed onto this end (the adapter) accordingly.
• the adapter can also be an independent component which is screwed (clamped) onto the gas outlet-side end of the gas supply line itself or welded to it.
• the adapter in turn has anchoring means of the type mentioned above for the body.
• the adapter can have a flow cross section (for the treatment gas) that is larger than that of the gas supply line. It is also possible to design the adapter with several gas outlet openings. Accordingly, the body will then be formed with a number of webs, each of which is assigned to a gas outlet opening in the mounting position. After the burnout, a large number of individual gas channels are made available, starting directly from the adapter.
• the shape of the body (the inserts) is - as stated - almost arbitrary.
• the bodies can have a plate shape, a surface shape, a net shape, a cylindrical shape, a cuboid shape, a cone shape or similar three-dimensional geometries.
• the body sections can be connected to one another in order to facilitate the assembly. Above all, the body will preferably be in one piece at its connection point with the adapter in order to enable simple assembly.
• FIGS. 3 and 4 gives further information in this regard.
• a plurality of, for example radially arranged, webs can run, which extend at a distance from one another or networked through the refractory casing.
• connection of one end of the body to the adapter (the gas supply line) is maintained in order to Example after the burnout to create a direct flow-technical connection from the gas supply line into the uncovered winding channels.
• the insert (the body) can protrude with its free end section over the (dense) refractory casing. In the case of a winder bottom, the body then protrudes (before the burnout or before pulling out) into the interior of the metallurgical vessel.
• a burnable body is functionally destroyed when the refractory lining is heated up or when the metal melt is poured in. It is possible to cover the device (the body, or possibly also the entire sink bottom) with porous refractory mass.
• the gas flushing device described can be replaced or repaired after the refractory material has worn out.
• the refractory mass is broken out to the adapter and then placed on a new body and encased and / or encased with refractory material.
• the gas flushing line and adapter are therefore reusable, only the insert and the worn refractory material are replaced.
• the design enables - as stated - the production of a gas flushing floor as a prefabricated component.
• the worn floor including the rinsing device
• a new floor including the rinsing device.
• Form-locking elements on the edge facilitate connection to neighboring components.
• Coupling point on the side of the prefabricated component facing the vessel base simplifies the adjustment of the base during installation.
• the precast idea can be extended to complete refractory linings (wall and floor) for metallurgical melting vessels.
• the inserts can be designed with a very small cross-sectional area to avoid the risk of
• the channel width / channel diameter should be a maximum of 0.5 mm (when the winding base is cold).
• Fig.la shows a gas supply line 22 in the free end of which a corresponding end of a body 28 made of plastic is inserted, which branches like a candlestick to the opposite end in the form of numerous thin arms 32.
• the gas supply line 22 runs through the metallic jacket 12 of a pan and through a permanent lining 14 made of refractory ceramic stones. Thread-like webs 32 made of plastic are arranged in the monolithic pan base 20 so that they protrude at one end into the open end of the line 22 and run at the other end into the top 20o of the lining 20. After burnout a the channel network corresponding to the web course in the refractory lining 20, which connects directly to line 22.
• the free end of the gas supply line 22 is screwed into a bore 40 in the metal jacket 12.
• the bottom 20 is here rem monolithically (without permanent lining on the wall side) formed by pouring over a burnable body 28 with a refractory mass.
• the body 28 consists of a plate-like base part 28b and octopus-like thin arms 32 which protrude laterally and upwardly therefrom and which, after burnout, form a gas distribution chamber in the region of the base part 28b and winding channels in the region of the arms 32.
• the gas flows accordingly from line 22 via the gas distribution chamber and the channels into the melt.
• a metallic gas distribution chamber 42 is placed on the outside on the metal jacket 12, which has openings 40 in this area, to which are connected channels that have arisen in the refractory material of the base 20 after the corresponding paper webs 32 have burned out.
• a metallic tubular coupling part 50 projects into the monolithic lining 20 and a small piece into a plastic body 28b.
• the body 28b lies centrally in the lining 20.
• Thread-shaped arms 32 made of plastic extend from the body 28b to the top 20o of the lining (bottom) 20.
• the clutch actuator 50 fulfills two functions: it serves as an adjustment aid during insertion the bottom m em melting vessel, for example a pan or a distributor when it is passed through a corresponding opening 40 in the metal jacket of the vessel. It also serves to connect the gas supply line (here: via a bayonet lock). After the body 28b (including the arms) has been burned out, the gas supply takes place via the line 22, the coupling part 50 and that through the Body and arms exposed areas in the molten metal.
• FIG. 3 shows a partial section of a cast steel ladle 10 with an outer metal armor 12, a refractory permanent lining 14 arranged in front of it and an inner refractory monolithic lining 16 in the wall and floor areas 18, 20.
• a metallic gas supply line 22 extends through the steel armor 12 and the permanent lining 14 into the bottom region 20, which is sealed to the outside above the permanent lining 14 with the aid of a sleeve 24.
• the gas supply line runs in a spiral and a metallic adapter 26 adjoins its free end 22e in a gas-tight manner, which is part of the gas supply line 22.
• the adapter 26 runs essentially perpendicular to the bottom lining 14 and has a cylindrical shape.
• a body 28 (FIG. 4) is attached to the upper free end of the adapter 26 and is constructed as follows:
• the body 28 has an axially extending sleeve 30 on the bottom side, the inner cross section of which is the same or slightly larger than the outer cross section of the free end of the adapter 26, so that the body 28 can be placed on the adapter 26 via the sleeve 30 with a positive fit.
• the sleeve 30 is closed at the top and a plurality of webs 32 extend radially from its upper end section and merge into an annular web 34, which is followed by a hollow-cylindrical part 36.
• the body 28 is produced as an injection molded part and is therefore in one piece.
• FIG. 3 shows, there is a monolithic refractory lining 16 on the refractory lining 14, which surrounds the area of the gas supply line 22 running above the lining 14, the adapter 26 and the body 28 (with the exception of its upper free end section) on all sides.
• the refractory mass thus runs both within the hollow cylindrical part 36 of the body 28 and in the area between the webs 32, 34 or around the aforementioned components.
• the gas purging device consisting of gas supply line 22, adapter 26 and body 28, is integrated on all sides in the scope of the components described above into the refractory monolithic floor lining.
• the body 28 ends with its upper free end 28o either at the level of the upper level 20o of the base lining 20 or protrudes slightly above this level in order to have a continuous gas path through the gas supply line 22 after the body 28 has burned out (with all of its components) to enable the adapter 26, the webs 32, 34 and the part 36 into a molten metal 40.
• the size of the body 28 or the cross sections of its components are adapted depending on the respective application conditions and the desired amount of the gas supplied.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Manufacturing & Machinery (AREA)
• Treatment Of Steel In Its Molten State (AREA)
• Carbon Steel Or Casting Steel Manufacturing (AREA)
• Furnace Charging Or Discharging (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Furnace Details (AREA)
• Filling Or Discharging Of Gas Storage Vessels (AREA)

Priority Applications (1)

Applications Claiming Priority (3)

Publications (2)

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• 1996
  • 1996-02-07 DE DE19604413A patent/DE19604413C1/de not_active Expired - Fee Related
• 1997
  • 1997-01-30 US US09/117,697 patent/US6129889A/en not_active Expired - Fee Related
  • 1997-01-30 AT AT97902266T patent/ATE189980T1/de not_active IP Right Cessation
  • 1997-01-30 ES ES97902266T patent/ES2146077T3/es not_active Expired - Lifetime
  • 1997-01-30 DE DE59701178T patent/DE59701178D1/de not_active Expired - Fee Related
  • 1997-01-30 CZ CZ19982441A patent/CZ289796B6/cs not_active IP Right Cessation
  • 1997-01-30 AU AU15973/97A patent/AU1597397A/en not_active Abandoned
  • 1997-01-30 SK SK1053-98A patent/SK105398A3/sk unknown
  • 1997-01-30 EP EP97902266A patent/EP0894033B1/fr not_active Expired - Lifetime
  • 1997-01-30 CA CA002245668A patent/CA2245668C/fr not_active Expired - Fee Related
  • 1997-01-30 JP JP9528108A patent/JP2000504780A/ja active Pending
  • 1997-01-30 DK DK97902266T patent/DK0894033T3/da active
  • 1997-01-30 KR KR1019980706049A patent/KR19990082319A/ko not_active Withdrawn
  • 1997-01-30 WO PCT/EP1997/000406 patent/WO1997028915A1/fr not_active Ceased

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