GB2217438A - Apparatus for introducing a treatment gas into the melt of a metallurgical melting vessel - Google Patents
Apparatus for introducing a treatment gas into the melt of a metallurgical melting vessel Download PDFInfo
- Publication number
- GB2217438A GB2217438A GB8906922A GB8906922A GB2217438A GB 2217438 A GB2217438 A GB 2217438A GB 8906922 A GB8906922 A GB 8906922A GB 8906922 A GB8906922 A GB 8906922A GB 2217438 A GB2217438 A GB 2217438A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- gas
- passage
- wire
- distributing chamber
- 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
Links
- 238000002844 melting Methods 0.000 title claims description 12
- 230000008018 melting Effects 0.000 title claims description 12
- 239000000155 melt Substances 0.000 title claims description 9
- 238000011010 flushing procedure Methods 0.000 claims description 40
- 229910052751 metal Inorganic materials 0.000 claims description 22
- 239000002184 metal Substances 0.000 claims description 22
- 239000000956 alloy Substances 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 238000012856 packing Methods 0.000 claims description 12
- 239000000919 ceramic Substances 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 42
- 239000000654 additive Substances 0.000 description 8
- 239000007787 solid Substances 0.000 description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 239000011261 inert gas Substances 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 3
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- MVXMNHYVCLMLDD-UHFFFAOYSA-N 4-methoxynaphthalene-1-carbaldehyde Chemical compound C1=CC=C2C(OC)=CC=C(C=O)C2=C1 MVXMNHYVCLMLDD-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910052845 zircon Inorganic materials 0.000 description 2
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 1
- 229910003336 CuNi Inorganic materials 0.000 description 1
- 229910004534 SiMn Inorganic materials 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012254 powdered material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000009182 swimming Effects 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Furnace Details (AREA)
- Continuous Casting (AREA)
Description
j -v 22M 53 797 2j [ ---8 2' 746 Apparatus for introducing a treatment gas
into the melt of a metallurgical melting vessel.
The invention relates to an apparatus for introducing a treatment gas into the melt in a metallurgical melting vessel, having a fire-proof, ceramic flushing block for gas and a gas distributing chamber arranged at the lower end thereof with a facility for connecting a gas feed line.
Such an apparatus, for instance, is disclosed in DE-OS 35 03 222 and EPOS 242 155.
In the case of the DE-OS 35 03 222 the flushing block consists of a porous, fireproof, ceramic material, through which exclusively gas may be passed. The flushing block illustrated in EP-OS 242 155, however, is one with directional porosity, but at the same time it is intended exclusively for flushing with gas. The gas distributing chamber correspondingly serves for evening out the gas pressure in the flushing block.
On the other hand, there is a requirement for treating metallurgical melts not only with gases, more particularly inert gases such as argon, but also for adding alloys or additives in solid form to the molten metal. These alloys may, for instance, be SiMn or Casi, the additives may be fine lime or mixtures of fine lime and soda, but also calcium carbide (CaC 2) and calcium cyanamide (CaCN2).
The introduction of such alloys or additives in the
2 form of wire into a metallurgical melt is known. In so doing, the wire is brought to the surface of the melt by a guide pipe and immersed into the melt through the bath surface. It is important here, that the components of the solid or filler wire completely dissolve, since they become ineffective as soon as they again reach the surface of t he bath or the layer of slag swimming on top of it. With regard to this, however, the known proposals have a disadvantage as the additives only have a limited distribution and reaction time.
A flushing block is described in DE-OS 35 20 207 which is intended for blowing gases or solid reagents into a ladle containing a molten metal. The flushing block has a central, large passage, through which gases or solids can be blown. The embodiment described with an especially large passage cannot, however, be put into practice since, with a passage of this size, molten metal could enter the flushing-block without difficulty and destroy the apparatus. Moreover, considerable quantities of gas would be necessary in order to maintain a more or less constant gas pressure and even then molten metal might still not be prevented from entering.
In this respect, the invention has the object of providing an apparatus of the kind mentioned above which is not only suitable for flushing with gas but also for introducing solid additives, in particular alloys and filler wires, but also desulphur.ising agents. For this purpose, the apparatus should preferably be constructed such that it may also be used exclusively as a flushing block. The invention also aims at constructing the apparatus in such a way that metering, reactivity and distribution of the additives is improved in the molten metal.
C. i 1 i 1 3 -1 The invention is based on the finding that, in principle, apart from a flushing with gas, apparatuses of the kind mentioned above are also suited to enable introduction of solid alloys.or additives, if they are converted suitably. In particular in an apparatus providing a flushing block with directional porosity, the matrix material between the individual channels may be used to form a passage through which, for instancer an alloy wire is introduced into the molten metal. When this channel issues from the gas distributing chamber, it is flushed with gas at the same time. This will thus prevent wire from melting and melt from entering a gap formed between the wire and the supply tube, in the region of the flushing block.
In its most general embodiment the invention provides an apparatus of the kind mentioned above, in which the gas distributing chamber has an opening, from which extends upwardly a tubular passage through the flushing block up to the upper end thereof, facing the molten metal, and which provides a further opening in the gas distributing chamber, through which an alloy or filling wire or a tube, more particularly a metal tube, may.be introduced into the gas distributing chamber and the passage. It is in particular advantageous here, if the region of the opening, through which the wire or the tube is introduced into the gas distributing chamber, is sealed so as to be impervious to gas.
For this purposer various constructive measures are at the disposal of the skilled man. A particularly advantageous construction may be obtained by arranging a stuffing-box packing, in particular if it is provided directly below the respective opening ofthe gas distributing chamber, since it may then also be operated from outside.
4 - Apart from the advantages already mentioned, the apparatus is in particular characterized in that the wire is flushed into that part of the melt, which is in any case activated most intensively during the treatment of the flushing block with inert gas. The reagents may thus be homogeneously digtribu-ted by the bath stream. Finally, the passage of the alloy materials is ensured through the entire length of the melting bath, thus optimising their efficiency-.
The apparatus may be further improved by a plurality of constructive measures. It is thus suggested that the chamber around the supply opening for the wire in the upper portion of the gas distributing chamber towards the refactory flushing block be constructed so as to narrow in the supply direction of the wire. In particular, this ensures that, when a wire is first flushed in, the wire is flushed into the passage directly and without twisting it.
The passage itself may be either drilled or may consist of a steel or ceramic tube which is then preferably mortared into the correspondingly drilled matrix material of the flushing block. An alloy'of the type X50 CuNi 18/9, for instance, is a suitable quality of steel. The ceramic tube may, for instance, consist of aluminium oxide or zircon dioxide. It may be manufactured as an isostatically pressed part.
As already mentioned above, the diameter of the tube, is chosen to be preferably somewhat greater than the diameter of the wire to be flushed in, an optimal dimensioning being achieved, when the internal diameter of the tube is approximately 1 to 2 mm greater than the diameter of the wire.
Though the apparatus may be equipped with any type Z of flushing block (so-called-jointed flushing channels, flushing blocks with directional porosity, flushing channels with non-directional porosity), a flushing block with directional -porosity, however, is preferred, as the supply tube for the wire may then be arranged between the individual channels of the flushing block. Preferably, the passage is arranged in the centre and the gas supply channels extend around the passage so as to be uniformly distributed, thus advantageously affecting the flushing impact and the distribution of the molten alloy wire.
If a further tube is provided in the passage or with the fixed tube-, so as to be displaceable, but without play, the passage or the tube may also be used for injecting powdered solids, whereby the tube is led downwardly through the gas distributing chamber. via respective connecting tubes, the powdered additives may preferably be injected through the tube with an inert gas stream in an analogous manner, as described above with reference to the introduction of an alloy wire. Any melting in the contact region of the molten metal may be compensated for by pushing the tube further upwards. Between the individual batches tube pieces may be flanged to the lower end of the tube, which was pushed in last, or, for instance, be attached by screwing them on via respective threaded portions, so that a more or less "continuous".tube may be pushed up.
Further features of the invention are apparent in the sub..claims as well as the other application documents.
The invention is hereinafter fully explained by way of example with reference to a drawing which illustrates in a highly diagrammatic representation a section through an apparatus according to the invention.
Here a flushing block providing a plurality of fine channels 12, which have a diameter of approximately 1 mm, of which altogether four channels 12 are identifiable, is marked bv the reference numeral 10. The channels are positioned in a sealed refractory matrix which consists of a ceramic material, in this-case on the basis of corundum with more than 97% by weight of Al 2 0 3 However, other known kinds of refractory may also be used.
The flushing block 10 is positioned on a metal box 14 surrounding a gas distributing chamber 16.
In its cross-section the metal box 14 has a circular shape and its circumferential wall 18 is raised upwardly beyond the cover 20, thus forming an chamber 21, into which the flushing block 10 is inserted. The cover 20 provides openings 22 which, in their number, size and association, correspond to the channels 12, so that the openings 22 lie in the extension of the channels 12 and form a connection between the channels 12 and the gas distributing chamber 16. Apart fromthe openings 22, the metal box 14 has in its cover 20 a further, central opening 24 with a circular cross-section. The opening 24 is larger than the openings 22.
A passage 26, whose cross-section substantially corresponds to that of the opening 24, extends above the opening 24 in the flushing block. The passage 26 is circumferentially defined by an impervious, refractory, ceramic tube 28 of zircon dioxide which is glued into the matrix material of the flushing block 10. The tube 28 terminates directly at the upper side of the cover 20, while a tube portion 30 enlarged downwardly like a funnel is welded into the opening 24 such that it more or less-runs as an extension of the tube 28 and thus projects into i;; 11 1 7 - the gas distributing chamber 16.
opposite the opening 24 in the base 32 of the metal box 14 there is a further opening 34 and below the opening 34 a stuffing-box packing 36 is provided. The stuffing-box packing 36 consists of a stuffingbox body 38 which can be screwed, via corresponding threaded portions 42, against a gland 40r thus compressing a packing material arranged between the two parts 38, 40 in a packing chamber 44, resulting in the desired sealing. As is apparent from the figure, the gland 40 is welded to the underside of the base 32 of the metal box 14. It is also apparent from the figure that the stuffing-box packing encloses a passage 46.
A third opening 48, from which a gas supply tube 50 extends downwardly, is provided next to the opening 34 in the base 32 of the metal box 14.
Before.explaining in detail the functioning of the apparatus, it should be pointed out that the apparatus or the flushing block 10 is arranged in a known manner in the sleeve block of the base of a metallurgical melting vessel.
For putting it into operation, gas, in particular inert gas such as argon, is supplied by the gas supply tube 50 to the gas distributing chamber 16, from where it reaches the molten metal via the channels 12 in the flushing block 10. Beforehand an alloy wire 52 was already passed to the tube 28 via the stuffing-box packing 36, the gas distributing chamber 16, and the tube portion 30. Via the gas distributing chamber 16, the gas also reaches the annular gap formed between wire 52 and tube 28. Whilst the wire is pushed further upwards, and melted by the molten metal, when reaching the end face 54 of the flushing block 10, it is always surrounded by an inert gas stream, which prevents both the wire from melting in the region of the flushing block and the molten metal from entering said gap between wire 52 and tube 28.
Depending on the amount of alloy-elements to be supplied, the wire is pushed upward s over a certain length of time, whilst keeping the flushing via the channels 12 unchanged at the same time.
A leakage of gas through the opening 34 is prevented by the fact that the passage 46 in the region of the stuffing-box packing 36 has been chosen to be of the same dimension as the outer diameter of the wire. Moreover, the arrangement of the stuffingbox packing has an additional sealing effect.
This arrangement makes it possible for the wire to -be threaded from below, which is especially simple and convenient. An interruption of the continued wire supply causes no problems either, because a certain gas pressure is always maintained in the passage 28, thus preventing an infiltration of the molten metal or a melting of the wire.
Whilst the downwardly enlarged tube portion 30 facilitates the initial flushing in of the wire 52, the apparatus may also be used exclusively for flushing with gas. For this purpose, it is preferred to place fixedly, an impervious cylindric stopper of a ceramic material, such as aluminium oxide, at least in the upper portion 281 of the tube 28. The tube 28 is thus closed, whilst gas can still flow into the molten metal via the channels 12.
- 1 V By arranging the channels 12 around the tube 28, an especially advantageous distribution of the molten alloy particles in the molten metal is achieved, when a wire is passed through. obviously, depending on the application, other associations of the channels 12 with the tube 28 are also possible.
Instead of the wire 52 a tube may also be pushed into the passage in a similar manner as the wire -52. By means of this moveable tube, it is possible to introduce above all powdered materials, in particular together with an inert gas stream (for instance argon), through the tube via corresponding connecting lines. This tube preferably has at its end, projecting downwardly beyond the packing 36, an internal thread so that a further tube with a corresponding external thread at its end may be fixed to the first tube. If necessary, the tube may thus be pushed further upwards (through the passage 28), if melting in the region of the end face 54 requires this. A further tube is preferably connected between individual batches, when the supply of gas/solids is interrupted and when the connecting lines may be detached from the first tube and moqnted to the next tube. Moreover, the advantages, mentioned with reference to the threading of the wire, are similarly achieved in this construction.
Claims (13)
1. Apparatus for introducing a treatment gas into the melt of a metallurgical melting vessel, including a fire-proof ceramic flushing block and a gas distributing chamber arranged at the lower end thereof to which gas feed line can be connected, the gas distributing chamber having a first opening, from which a tubular passage extends upwardly through the flushing.block up to the upper end thereof facing, in use, the molten metal and a further opening being provided in the gas distributing chamber via which an alloy or filler wire or a tube can be introduced into the gas distributing chamber and the passage.
2. Apparatus according to claim 1, in which the region of the further opening, via which the wire or the tube is introduced into the gas distributing chamber, is sealed so as to be impervious to gas.
3. Apparatus according to claim 2, wherein a stuffingbox packing is arranged in the region of the further opening.
4. Apparatus according to claim 3, in which the stuffing-box packing extends directly below the further opening.
5. Apparatus according to any of claims 1 to 4, in which the region around the first opening is constructed so as to taper in the supply direction of the wire to be introduced.
6. Apparatus according to any of claims 1 to 5, in which the passage consists of a steel or ceramic tube inserted into the matrix material of the flushing N zi v i 11 - block.
1 r,
7. Apparatus according to claim 6, in which the tube or a separate tube section projects downwardly into the gas distributing chamber and is constructed there like a funnel Which widens in the gas distributing chamber.
8. Apparatus according to any of claims 1 to 7, in which the internal diameter of the passage or the tube is somewhat larger than or of the same size as the external diameter of the wire or tube iDassed through.
9. Apparatus according to claim 8, in which the internal diameter of the passage or the tube is 1 to 2 mm larger than the external diameter of the introduced wire.
10. Apparatus according to any of claims 1 to 9, in which the flushing block is one with directional porosity.
11. Apparatus according to claim 10, including gas supply channels extending through the flushing block and being more or less uniformly distributed around the passage.
12. Apparatus according to any of claims 1 to 11, in which the upper section of the passage can be closed with a tight, fire-proof ceramic stopper.
13. Apparatus for introducing a treatment gas into the melt of a metallurgical melting vessel substantially as described with reference to the accompanying drawing.
Published 1989 at The Patent Office. State House, SCV71 High Holborn, London WCIR 4TP, Further copies maybe obtained from The Patent Oftice.
Sa3es Branch, St Mary Cray, Orpirgton, Kent BF.5 3ED. Printed by Multiplex techniques ltd, St Mary Cray, Kent, Con. 1/87..- 11-, - w'y Uray, UITII;&WII, jn'em' "isD oxuj. rrmwa Dy iz-LuTapiex teenniques ito, bt wary Lway. isent. Uon. V67
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3810098A DE3810098C1 (en) | 1988-03-25 | 1988-03-25 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8906922D0 GB8906922D0 (en) | 1989-05-10 |
| GB2217438A true GB2217438A (en) | 1989-10-25 |
| GB2217438B GB2217438B (en) | 1991-08-07 |
Family
ID=6350667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8906922A Expired - Lifetime GB2217438B (en) | 1988-03-25 | 1989-03-28 | Apparatus for introducing a treatment gas into the melt of a metallurgical melting vessel |
Country Status (6)
| Country | Link |
|---|---|
| AT (1) | AT396438B (en) |
| DE (1) | DE3810098C1 (en) |
| FR (1) | FR2629102B1 (en) |
| GB (1) | GB2217438B (en) |
| IT (1) | IT1229881B (en) |
| SE (1) | SE470193B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100360259C (en) * | 2003-02-08 | 2008-01-09 | 里弗雷克特里知识产权两合公司 | Fire-resistant ceramic gas sink |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3919238A1 (en) * | 1989-06-13 | 1990-12-20 | Voest Alpine Ind Anlagen | RINSING DEVICE FOR A METALLURGICAL VESSEL |
| DE102004010600B4 (en) * | 2004-03-02 | 2008-07-03 | Thyssenkrupp Vdm Gmbh | Process for primary oxide hardening of molten metals |
| DE102006018931B3 (en) * | 2006-04-24 | 2007-07-26 | Refractory Intellectual Property Gmbh & Co. Kg | Feed system for gas flushing of metallurgical vessels comprises gas pipe enclosed in larger refractory pipe which also encloses cooling pipe with perforations, through which cool air flows |
| DE102011080017B3 (en) | 2011-07-28 | 2012-11-22 | Siemens Aktiengesellschaft | Device for receiving and unwinding at least one wire roll, metallurgical system equipped therewith and method for unwinding wire |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1587804A (en) * | 1977-03-07 | 1981-04-08 | Uss Eng & Consult | Distributor manifold for a steel refining vessel |
| EP0116756A1 (en) * | 1982-11-23 | 1984-08-29 | Injectall Limited | Apparatus for introducing substances into liquids e.g. metal melts |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4470582A (en) * | 1982-02-15 | 1984-09-11 | Zirconal Processes Limited | Introduction of substances into molten metal |
| GB2122532A (en) * | 1982-05-20 | 1984-01-18 | K S R International Limited | Manufacture of gas-permeable plugs |
| FR2538410B1 (en) * | 1982-12-24 | 1988-04-29 | Siderurgie Fse Inst Rech | REFRACTORY ELEMENT AND NOZZLE HOLDER AND METHOD FOR PREVENTING REFRACTORY WEAR USING THE SAME |
| AT383617B (en) * | 1984-09-18 | 1987-07-27 | Oesterr Amerikan Magnesit | GAS PURGE FOR METALLURGICAL OVENS AND VESSELS |
| DE3503222C2 (en) * | 1985-01-31 | 1987-02-12 | Didier-Werke Ag, 6200 Wiesbaden | Gas purging cone |
| DE3538498A1 (en) * | 1985-10-30 | 1987-05-07 | Didier Werke Ag | INJECTING DEVICE FOR METALLURGICAL VESSELS |
| LU86211A1 (en) * | 1985-12-16 | 1987-07-24 | Wurth Paul Sa | PROCESS FOR RECOVERY OF METAL COMPONENTS CONTAINED IN DUST AND SLUDGE FROM STEEL PLANTS |
| GB8609063D0 (en) * | 1986-04-14 | 1986-05-21 | British Steel Corp | Injection elements for melt containing vessels |
-
1988
- 1988-03-25 DE DE3810098A patent/DE3810098C1/de not_active Expired
-
1989
- 1989-02-01 SE SE8900341A patent/SE470193B/en not_active Application Discontinuation
- 1989-02-15 IT IT8919442A patent/IT1229881B/en active
- 1989-02-24 AT AT0041589A patent/AT396438B/en not_active IP Right Cessation
- 1989-03-24 FR FR8903939A patent/FR2629102B1/en not_active Expired - Lifetime
- 1989-03-28 GB GB8906922A patent/GB2217438B/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1587804A (en) * | 1977-03-07 | 1981-04-08 | Uss Eng & Consult | Distributor manifold for a steel refining vessel |
| EP0116756A1 (en) * | 1982-11-23 | 1984-08-29 | Injectall Limited | Apparatus for introducing substances into liquids e.g. metal melts |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100360259C (en) * | 2003-02-08 | 2008-01-09 | 里弗雷克特里知识产权两合公司 | Fire-resistant ceramic gas sink |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3810098C1 (en) | 1989-03-23 |
| FR2629102A1 (en) | 1989-09-29 |
| GB2217438B (en) | 1991-08-07 |
| GB8906922D0 (en) | 1989-05-10 |
| IT1229881B (en) | 1991-09-13 |
| SE470193B (en) | 1993-11-29 |
| AT396438B (en) | 1993-09-27 |
| FR2629102B1 (en) | 1992-10-09 |
| ATA41589A (en) | 1993-01-15 |
| SE8900341L (en) | 1989-09-26 |
| IT8919442A0 (en) | 1989-02-15 |
| SE8900341D0 (en) | 1989-02-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940328 |