EP0832987B1 - Sauerstofflanze und Verfahren zum Verblasen von flüssigem Metall - Google Patents

Sauerstofflanze und Verfahren zum Verblasen von flüssigem Metall Download PDF

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Publication number
EP0832987B1
EP0832987B1 EP97115765A EP97115765A EP0832987B1 EP 0832987 B1 EP0832987 B1 EP 0832987B1 EP 97115765 A EP97115765 A EP 97115765A EP 97115765 A EP97115765 A EP 97115765A EP 0832987 B1 EP0832987 B1 EP 0832987B1
Authority
EP
European Patent Office
Prior art keywords
oxygen
converter
inert gas
lance
blowing
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
EP97115765A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0832987A1 (de
Inventor
Karl Dipl.-Ing. Fasshauer
Andreas Dipl.-Ing. Kulkies
Wilfried Dipl.-Ing. Lissack
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.)
Linde Gas AG
Original Assignee
Linde Gas 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 Linde Gas AG filed Critical Linde Gas AG
Publication of EP0832987A1 publication Critical patent/EP0832987A1/de
Application granted granted Critical
Publication of EP0832987B1 publication Critical patent/EP0832987B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C22B15/00—Obtaining copper
    • C22B15/0026—Pyrometallurgy
    • C22B15/0028—Smelting or converting
    • C22B15/003—Bath smelting or converting
    • C22B15/0041—Bath smelting or converting in converters
    • 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
    • C21C5/4606—Lances or injectors
    • C21C2005/4626—Means for cooling, e.g. by gases, fluids or liquids
    • 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
    • C21C5/4606—Lances or injectors
    • C21C5/4613—Refractory coated lances; Immersion lances

Definitions

  • the invention relates to an oxygen lance for blowing a liquid metal into a converter with two concentric tubes, which have an inner supply line for a Form oxygen-containing gas and an outer supply line for an inert gas. Further The invention relates to a method for blowing a liquid metal into a converter by means of such an oxygen lance, an oxygen-containing one Gas and an inert gas are introduced into the converter.
  • Raw copper is extracted in several steps using the standard process.
  • copper mostly occurs in connection with iron in the form of sulfur-containing ores, such as copper gravel.
  • sulfur-containing ores such as copper gravel.
  • the correct quantitative ratio between copper, iron and sulfur is set by partial oxidation of the sulfur in the ores, so that the subsequent melting of the ores produces a copper stone of the desired composition.
  • the copper stone which essentially consists of CuS 2 and FeS, is separated from the slag produced.
  • the copper stone is further processed by blowing in a converter.
  • the sulfur iron is first oxidized by blowing air into or onto the liquid copper stone and converted into a slag by adding quartz.
  • the slag formed is drawn off from the bath surface and so-called trace stone CuS 2 is obtained .
  • trace stone CuS 2 is obtained .
  • the liquid raw copper separates from the trace stone melt.
  • iron is similarly extracted from the nickel stone Blown away in a converter.
  • WO 95/09250 proposes to increase the performance of a converter air enriched with more than 30 volume percent oxygen in the melt blow in.
  • the lances for supplying the oxygen-containing gas are two concentric tubes formed, the inner tube containing the oxygen Gas and an inert gas is passed through the outer tube.
  • the inert gas is said to be between 5% and 25% of the exothermic reaction of oxygen with the copper stone absorb the heat generated, causing the lances to burn too quickly should be prevented.
  • the oxygen content of the injected Gases are between 40 vol .-% and 60 vol .-%.
  • EP-A-0 053 848 describes a process for blowing in high-oxygen content Gases in a weld pool containing non-ferrous metals by means of the Known reactor wall in the melt double tube nozzles.
  • a protective fluid is blown into the nozzle of each double tube nozzle as a coolant.
  • the amount of protective fluid is adjusted so that approaches on the one hand on the nozzles are formed, on the other hand the approaches do not have a desired thickness exceed.
  • the present invention has for its object to provide an oxygen lance Blowing an oxygen-containing gas into a converter that the blowing time is shortened and the blowing of highly enriched air or pure Oxygen is enabled.
  • the service life of both the lances and the Converter wall in which the lances are built should also be used highly enriched air or pure oxygen must not be shorter than that previous air blowing.
  • the invention is also intended to provide a method make, which for blowing molten metal, the at least one contains oxidizable component, in particular for blowing copper or Nickel stone, is suitable.
  • this object is achieved according to the invention by an oxygen lance solved the type mentioned, the distance between the inner and the outer tube at least 1.5 mm and the wall thickness of the outer tube is at least 2.5 mm.
  • the oxygen lances can also consist of pipe sections which interchangeable nozzles with the above dimensions are attached. It is essential that at least the part of the projecting into the converter Oxygen lance has the dimensions according to the invention.
  • the oxygen lance according to the invention is used to blow in oxygen-containing gases with significantly increased compared to the prior art Oxygen content up to the use of essentially only oxygen existing gas allows. Due to the large wall thickness of the outer tube, the Thermal conductivity of the outer tube significantly increased. Part of the reaction between the oxygen and the melt released thermal energy thereby derived through the outer tube without being damaged. The Inert gas flowing out between the inner and outer tubes compensates for one part of the heat energy, so that the lance burns off as a whole is slowed down considerably when using pure oxygen.
  • pipes should not only be those with a round one Cross section can be understood, but also tube profiles with a square or generally polygonal cross section.
  • the lance burns back, as is the case with the previous one Use of air does not occur completely.
  • There is a risk that can connect the inner and outer tubes during the burn-back which on the one hand increases the heat transfer from the outer to the inner tube, which can damage the inner tube.
  • the inert gas flow carried in the space hindered or even interrupted which reduces its cooling effect. Both effects lead to damage or even failure of the Oxygen lance.
  • the annular gap between the both pipes have a width of at least 1.5 mm. It has been found that thereby the connection of the inner and outer tubes can be avoided, so that the disadvantages described above do not occur.
  • the inner tube is already cooled by the inert gas flow, to a certain extent But heat is still from the melt by heat conduction through this Pipe removed. It is therefore advantageous to use an inner tube with a Wall thickness of at least 2 mm. This wall thickness ensures that Inner tube withstands the thermal load that occurs.
  • the concentric arrangement of the outer tube and inner tube is advantageous ensured that the inner and outer tube by punctiform Spacers are connected.
  • Puniform in this context meant that the spacers have the smallest possible expansion on the Pipe surface. The size of this expansion depends on the Material and type of spacers.
  • the centering of the inner tube in the The outer tube can be achieved, for example, by means of pins or welding spots. Such a centering has the advantage that on the one hand by the Gap between the two tubes formed feed for the inert gas has a constant cross-section over the entire length of the tube, resulting in a uniform inert gas flow, and thus a constant cooling effect. On the other hand, the heat transfer occurs due to the only punctiform spacers minimized from the outer to the inner tube.
  • the number of spacers is also appropriate kept as low as possible, but care should be taken that even after Burning off part of the oxygen lance is always a stable and constant Arrangement of inner and outer tube remains guaranteed.
  • an arrangement of the spacers is sufficient in the the mutual angular distance of the spacers is at least 90 ° by one to achieve concentric arrangement of the tubes and this also after a Maintain partial burning of the lance.
  • the oxygen lance can be made of steel or copper, for example be made.
  • the lance is preferably made of steel.
  • the invention also relates to a method for blowing a liquid metal in a converter using the oxygen lance according to the invention.
  • the procedure is especially for blowing copper or nickel stone, but also generally for Refining metal melts that contain at least one oxidizable component included, usable.
  • the high oxygen content makes one special efficient reaction between the melt and the oxygen-containing gas achieved.
  • the lances according to the invention are special for carrying out this method well suited.
  • the heat generated during the reaction of the oxygen with the molten metal is partially compensated for by the inert gas supplied.
  • the inert gas forms a cooling gas protective jacket around the outlet area of the oxygen-containing gas, in which the greatest heating takes place.
  • the use of nitrogen or argon as a coolant has proven to be advantageous.
  • the use of air can also prove to be favorable for reasons of cost, but its cooling effect is less than that of nitrogen or argon due to the oxygen content. There may also be cases where the use of CO 2 as a cooling gas is cheap. Any mixture of the gases mentioned, in particular the mixture of nitrogen and air, is also suitable for cooling according to the invention.
  • the blowing of the oxygen-containing gas and the inert gas into the converter is preferably done laterally or from above.
  • copper stone is in one blow out side blowing converter or an inflation converter, because with one Blow the raw copper collecting at the bottom of the converter would cool down a lot.
  • the oxygen-containing gas is preferably at a pressure of at least 2 bar, particularly advantageously at least 5 bar, in the molten metal is initiated, as a particularly favorable flow profile of the introduced gas trains.
  • the life of the oxygen lances is advantageously extended by the fact that oxygen-containing gas and / or the inert gas even after blowing the liquid Metal are blown into the converter. By blowing in such a way oxygen and / or inert gas for a certain time the lance cooled gently and washed free of impurities.
  • the converter is preferably used only with the oxygen lances according to the invention equipped. But it is also possible to use only part of the lances in the to provide execution according to the invention.
  • the invention has significant advantages over the prior art.
  • the Oxygen lances according to the invention allow an increase in Oxygen content of the introduced oxygen-containing gas up to the supply pure oxygen.
  • the speed of the desired reaction between the This can significantly increase oxygen and the metal.
  • Due to the achieved with the lance of the invention higher implementation The total number of lances in a converter are lower, which means costs can be saved.
  • the large tube wall thicknesses ensure a good one Heat dissipation without damaging the lance. Due to the effective cooling, on the one hand through the tube walls, on the other hand through the nitrogen supply, the Lance durability even when pure oxygen is supplied from the inside Pipe significantly increased.
  • the process developed is suitable for blowing Metal melting, especially for blowing copper and nickel stone.
  • a lying drum converter 1 in which the liquid Copper stone 2 is located.
  • the sulfur-containing iron oxidized and converted into a slag by adding silica Bath surface can be peeled off. From the remaining so-called The smelting of the stone settles on the further blowing, the liquid raw copper in the lower part of the converter 1.
  • the length of the oxygen lances 3 is about Adjusted wall thickness of the converter 1 and is about 80 cm.
  • the lance 3 consists of an inner tube 4, which has a wall thickness of 3 mm.
  • This Tube 4 is closed at one end 5 and points in the vicinity of this tube end 5 a side supply line 6 for supplying oxygen.
  • An outer tube 7 is arranged concentrically with the inner tube 4 and also has a side Supply line 8. This allows nitrogen to enter the annular gap 11 between the two Pipes 4 and 7 are introduced.
  • the outer tube 7 is on that of the feed line 8 closer pipe end 9 gas-tightly connected to the inner tube 4.
  • the wall thickness of the Outer tube 7 is 4 mm. Between the two pipes are on the Inner tube 4 applied welding spots 10, which are the concentric position of the two Ensure pipes 4, 7.
  • the welding spots 10 are at a distance of 5 cm in Direction of the pipe longitudinal axes applied. Are located above the pipe circumference 4 welding spots 10 each.
  • the gap 11 formed between the tubes 4, 7 has a width of 1.7 mm.
  • the diameter of the tubes 4 and 7, the gap width 11 and the oxygen and nitrogen pressures are related to the size and loading of the Converter adjusted.
  • the amount of oxygen introduced is about 1.6 times as large like the nitrogen supply.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP97115765A 1996-09-18 1997-09-10 Sauerstofflanze und Verfahren zum Verblasen von flüssigem Metall Expired - Lifetime EP0832987B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19638148A DE19638148A1 (de) 1996-09-18 1996-09-18 Sauerstofflanze und Verfahren zum Verblasen von flüssigem Metall
DE19638148 1996-09-18

Publications (2)

Publication Number Publication Date
EP0832987A1 EP0832987A1 (de) 1998-04-01
EP0832987B1 true EP0832987B1 (de) 2001-11-28

Family

ID=7806075

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97115765A Expired - Lifetime EP0832987B1 (de) 1996-09-18 1997-09-10 Sauerstofflanze und Verfahren zum Verblasen von flüssigem Metall

Country Status (5)

Country Link
EP (1) EP0832987B1 (cs)
AT (1) ATE209703T1 (cs)
CZ (1) CZ294660B6 (cs)
DE (2) DE19638148A1 (cs)
PL (1) PL187501B1 (cs)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE516609C2 (sv) * 2000-06-29 2002-02-05 Ola Lundqvist Lans, förfarande för framställning av en lans samt användning av en lans
EP2302082B1 (de) * 2009-09-03 2013-04-17 Linde AG Verfahren zum Betreiben eines Konverters und Vorrichtung zur Durchführung des Verfahrens
CN110567280B (zh) * 2019-09-04 2024-03-15 中国恩菲工程技术有限公司 氧化还原枪及具有其的氧化还原炉

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990890A (en) * 1972-05-17 1976-11-09 Creusot-Loire Process for refining molten copper matte with an enriched oxygen blow
BE795117A (fr) * 1973-02-07 1973-05-29 Centre Rech Metallurgique Procede et dispositif pour le convertissage de matieres cuivreuses
US4036481A (en) * 1973-06-14 1977-07-19 Pennsylvania Engineering Corporation Steel converter vessel tuyere block construction
US4023676A (en) * 1976-09-20 1977-05-17 Armco Steel Corporation Lance structure and method for oxygen refining of molten metal
DE3045992A1 (de) * 1980-12-05 1982-07-22 Metallgesellschaft Ag, 6000 Frankfurt Verfahren zum einblasen von hochsauerstoffhaltigen gasen in ein ne-metalle enthaltendes schmelzbad
US4657586A (en) * 1985-10-25 1987-04-14 Union Carbide Corporation Submerged combustion in molten materials
US5435833A (en) * 1993-09-30 1995-07-25 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process to convert non-ferrous metal such as copper or nickel by oxygen enrichment

Also Published As

Publication number Publication date
PL187501B1 (pl) 2004-07-30
DE59705520D1 (de) 2002-01-10
ATE209703T1 (de) 2001-12-15
EP0832987A1 (de) 1998-04-01
CZ294660B6 (cs) 2005-02-16
CZ293197A3 (cs) 1998-07-15
DE19638148A1 (de) 1998-03-19
PL322128A1 (en) 1998-03-30

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