EP1190104A1 - Method of decarburisation and dephosphorisation of a molten metal - Google Patents
Method of decarburisation and dephosphorisation of a molten metalInfo
- Publication number
- EP1190104A1 EP1190104A1 EP00926586A EP00926586A EP1190104A1 EP 1190104 A1 EP1190104 A1 EP 1190104A1 EP 00926586 A EP00926586 A EP 00926586A EP 00926586 A EP00926586 A EP 00926586A EP 1190104 A1 EP1190104 A1 EP 1190104A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- channel
- lance
- oxygen
- decarburisation
- dephosphorisation
- 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
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
- C21C5/4606—Lances or injectors
-
- 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
- C21C7/064—Dephosphorising; Desulfurising
-
- 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
- C21C7/068—Decarburising
-
- 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
- C21C7/10—Handling in a vacuum
Definitions
- the present invention relates to a treatment of molten metals, in particular for the production of Ultra
- the present invention is also related to a lance required to perform said treatment in a degasser device .
- the step of decarburisation meaning reduction of carbon-content of the molten metal in a degasser device is known. This step is performed by blowing oxygen on the molten metal in the degasser device, said oxygen being in gaseous or solid oxide form. Because of the temperature drop caused by the decarburisation reaction, a reheating of the molten metal is performed.
- O96/16190 describes a process for blowing a pulsating stream of oxygen or an oxygen containing gas onto the surface of a molten metal bath, e.g. a molten steel in a degasser device, as a means of decarburisation.
- a fuel gas can be added to the oxygen stream, as well as a supply of solid oxide particles.
- This document also describes the lance used for the supply of said substances. Called the Mesid type 1 st generation, this lance has an annular channel for oxygen, and inside this channel, a movable circular channel for addition of solid oxides, further a Laval section for accelerating the oxygen, containing nozzles for adding fuel, and an annular cooling sleeve on the outside.
- the oxygen is used as the transport gas for blowing solid oxides on the -molten steel, which makes it difficult to regulate both oxygen and solids flows independently from each other.
- EP-A-0879896 describes an apparatus and a method for decarburisation of molten metal, said apparatus being a degasser device containing a number of fixed lance nozzles m the side of the degasser device, each having an inner tube through which gaseous oxygen is blown at supersonic speeds and an outer tube through which a cooling gas is blown. This installation provides however no possibility to add oxygen m the form of solid oxides.
- the main aim of the present invention is to improve the state of the art methods of producing ULC and SULC steels
- the present invention aims to provide a method to produce ULC and SULC steels, generating a time gain m the method.
- a further aim of the present invention is to provide an improved lance used to blow oxygen and/or solids on a molten metal m a degasser device.
- the present invention is related to a method of treatment of a molten metal m a degasser device, comprising the steps of decarburisation and dephosphorisation, characterised m that said decarburisation and said dephosphorisation are performed simultaneously m said degasser device.
- said method comprises the steps of blowing an amount of oxygen on the molten metal m said degasser device, said amount depending on the need for oxygen to perform said decarburisation, simultaneously with said decarburisation, blowing a first powder, consisting of a lime based flux, on said molten metal, to decrease the phosphorus content of said metal, simultaneously with said dephosphorisation and said decarburisation, blowing a further amount of oxygen on said molten metal, said further amount depending on the need for oxygen to perform sa d dephosphorisation
- said metal is steel and said method is performed m an RH-vessel to produce Ultra Low Carbon and Super Ultra Low Carbon steels.
- Said oxygen for decarburisation and/or dephosphorisation may be supplied m gaseous form or m the form of a second powder containing solid oxides, such as a powder containing substantially Fe
- Said lime based flux is a powder containing calcium oxide (CaO) . It may for example consist of 70% CaO and 30% calcium fluoride (CaF 2 ) .
- the amount of said lime based flux lies between 1 and 4 kg per ton metal .
- the rate at which said l me based flux is blown on said molten metal is at least 50 kg/minute, and preferably 100 kg/mmute.
- the present invention is equally related to a multifunctional lance used for the treatment of molten metal, m particular of steel m a degasser device, said lance comprising a central channel, coaxially surrounded by a channel which is cooled by a fluid, said lance being characterised m that : said central channel is fixed to the inside wall of said cooling channel by way of at least two ribs - a channel is placed eccentrically with respect to said central channel .
- an axial opening is present m one of said ribs, said eccentric channel being inserted m sa d axial opening.
- said eccentric channel is inserted m the space between two of
- Said eccentric channel may be a powder-supply channel, said powder supply channel being connected to a first supply system for a powder consisting of a lime based flux and to a second supply system for a powder containing solid oxides and to a transport gas supply system.
- Said eccentric channel may be fixed, or it may be movable m axial direction.
- said cooling channel is equipped with a ring at its mouth section, said ring having an inner diameter ranging from 0.8 X D to 1.6 X D, where D is the outer diameter of the central channel.
- said ring has an inner diameter ranging from 0.9 X D to 1.2 X D.
- said ring has an opening through which the stream of powder coming from the eccentric channel may flow to the molten metal.
- the mouth section of the central channel is placed at a distance (a) from the mouth section of said lance, so that (a) is maximum 3 times D', wherein D' is the inner diameter of said mouth section of said central channel.
- an actuator is used to move said lance in a vertical direction.
- the lance according to the invention may further comprise an ignition device.
- regulating devices are present to regulate the flow of the various substances to the lance according to the present invention.
- Figure 1 situates the invention within the different typical process stages at the steel works.
- Figure 2 describes industrial test results of the classical route and of the route following the invention.
- Figure 3 describes the process using a top blowing lance according to the invention.
- Figures 4a and 4b describe the lance according to a first embodiment of the invention.
- Figure 4a represents the front view
- figure 4b represents the section view along A-A'
- Figure 5 represents a section view of a second preferred embodiment of the lance according to the present invention.
- Figure 1 places the invention amongst the stages of the metallurgical process, and compares the result to the process of the prior art, for the production of ULC and SULC steels.
- the steel may follow the classical routes (100, 200) or the invention route 300.
- the classical route is subdivided m two routes having 2 or 3 treatment stages between the converter and the continuous casting device.
- the steel In the first classical route 100 (without dephosphorisation) , the steel is going directly to the degasser device. Directly after the decarburisation and chemical heating, the SULC or ULC steel undergoes a deoxidisation an and alloying treatment m the degasser or m the secondary metallurgy device.
- the steel is first dephosphorised m the secondary metallurgy device and then treated m the same way as the previous case.
- the steel goes to the degasser device for decarburisation, and it is simultaneously dephosphorised by means of a powder containing lime based fluxes which is blown together with or independent of oxygen on the surface of the steel into the degasser device.
- the SULC or ULC steel undergoes an oxidisation and alloying treatment m the degasser or m the secondary metallurgy device.
- the combined decarburisation/dephospho ⁇ sation m the method according to the invention avoids a time loss and temperature loss. Moreover, no oxygen supply or high dissolved oxygen content before degassing is necessary m the secondary metallurgy device.
- the molten steel enters the degassing device immediately after the converter stage.
- a combined decarburisation/dephospho ⁇ sation is to take place.
- a sufficient amount of dissolved oxygen must be present m the molten steel bath.
- Oxygen can be added by way of the lance of the invention, m the form of gaseous oxygen or m the form of solid oxides.
- the oxygen and/or solid oxides that have to be blown into the degasser are calculated based upon the initial oxygen content and the aimed oxygen content after decarburisation. The latter depends on the desired amount of chemical reheating.
- oxygen can be added as gaseous oxygen or as a powder containing solid oxides (e.g. iron oxides) by the aid of the lance of the invention before or during the addition of the lime based flux.
- solid oxides e.g. iron oxides
- solid oxides e.g. iron oxides
- co-m ⁇ ected with the lime containing fluxes by the same said lance will provide the necessary oxygen m order to promote the dephosphorisation reaction without reheating.
- the lime based flux amounts must be blown at a flow rate which is high enough to avoid time loss due to the powder blowing, at a minimum rate of 50 kg/ramute, and preferably at a rate of lOOkg/mmute .
- the slag for dephosphorisation is mainly formed by the injected powder, so dephosphorisation increases as a function of the mass and of the fluidity of the powder blown.
- the slag After the treatment, the slag must have enough phosphorus capacity and must be fluid enough to prevent P pickup m the steel. Preferably, an excess of 20% lime is added to the process slag or the process slag is skimmed and replaced by a new slag, formed by addition of lime or lime containing fluxes. [0053] By prolonging the treatment time and by blowing a higher amount of lime based flux, higher phosphorus removal will be obtained if needed. [0054] The reaction will be speeded up when a good contact between the lime containing fluxes and metal is obtained.
- the powder blowing lance is at a height preferably lower than 5 meters above the steel level m the degasser device.
- Figure 2 shows industrial results of the classical route (normal represented by the cloud of black points), i.e. degassing without dephosphorisation and of the route following the invention (10 white circles around their regression line), i.e with dephosphorisation during decarburisation.
- the graph compares P-levels after tapping from the converter (X-axis) to P-levels taken before the continuous casting device (Y-axis) .
- Figure 3 describes the process using a lance according to the invention.
- the degassing device 1 is placed above the ladle 2 containing the liquid steel 3.
- the up-leg snorkel 4 and the down-leg snorkel 5 are penetrating the liquid steel through the primary slag 6.
- the vacuum action pumps the liquid steel into the degassed chamber 7.
- the oxygen 8 and the powders 9, e.g. a lime based flux are blown through the top-lance 10 to the top of the steel-slag surface 11 within the degassing chamber. Due to the blowing pressure, the blown oxygen and the lime based fluxes are penetrating the liquid steel surface. They are then entrained into the ladle by the internal steel movement, through the down- leg snorkel and mixed with the liquid steel .
- FIG. 4a and 4b show the lance according to a preferred embodiment of the present invention. This lance offers the opportunity to m ⁇ ect powder together or without extra oxygen supply, and to regulate the flow of powder mdepently from the flow of oxygen gas .
- the powder may consist of solid oxides for decarburisation, or of a lime based flux for dephoshpho ⁇ sation, or of a mixture of both.
- the lance as shown m figures 4a and 4b comprises a central channel 13 with a Laval type section 33 at the end.
- a supply system for oxygen gas 51 a supply system for oxygen gas 51
- a supply system 52 for fuel e.g. natural gas
- a supply system 53 for a protection gas e.g. argon. This protection gas is sent through the central channel, when the oxygen flow is stopped, to prevent said central channel from possible damage.
- the central channel 13 is surrounded by an annular cooling channel 21, which is connected to the supply system of coolant 54, for example water. Between the outer wall of the central channel 13 and the inner wall 24 of the cooling channel 21 is another annular channel 19, which is equally connected to said oxygen supply system 51. [0061]
- the central channel 13 is fixed to the inner wall 24 of the cooling channel 21 by way of at least two ribs 14.
- a channel 31 is placed eccentrically with respect to the central channel 13. In the embodiment shown in figure 4b, this eccentric channel 31 is inserted in the space between two of said ribs 14.
- This channel 31 is connected to a supply system 55 for powder consisting of a lime based flux and to a supply system 56 for powder containing solid oxides.
- Said channel 31 is also connected to a supply system for an inert transporting gas 57, which may be the same gas, e.g. argon, as said protection gas.
- an inert transporting gas 57 which may be the same gas, e.g. argon, as said protection gas.
- one of the ribs has an axial opening 17, into which the channel 31 is inserted.
- the channel 31 is preferably fixed. According to another embodiment of the invention, the channel 31 may however be made movable along its axis so that it can be extended until its mouth section is flush with the mouth section 25 of the lance.
- a distance (a) between the mouth section 18 of the central channel 13 and the mouth section 25 of the lance is preferably smaller than three times the inner diameter D' of the mouth of the central channel 13.
- a ring 26 is placed, having an inner diameter d ranging from 0.8 X D to l.6 X D, and preferably from 0.9 X D to 1.2 X D, where D is the outer diameter of the central channel 13.
- Said ring 26 has an opening 27 through which the stream of powder coming from the channel 31 may flow to the molten metal. In case said channel 31 is movable, said opening 27 is large enough to accommodate said channel 31 m ts extended position.
- An actuator 61 is present, by which means the lance can be moved vertically along its axis, so that its mouth section 25 is placed closer or farther away from the molten metal m the degasser device.
- an ignition device 32 is present, m the form of a channel, connected to the fuel supply system 52, to the oxygen supply system 51 and to the protection gas supply system 53.
- This ignition device is used for igniting the flame when the lance is used as a burner, i.e. when oxygen and fuel are sent through the central channel 13, for example to heat the refractory of the degasser device, prior to decarburisation/dephospho ⁇ sation.
- Regulating devices are present to regulate the flow of the various substances which are supplied to the lance, namely for the regulation of the flow of gaseous oxygen 71, coolant 76, fuel 73, powder consisting of a lime based flux 74 and powder containing solid oxides 77, transporting gas 75 and protection gas 78.
- the lance according to the present invention allows independent regulation of the addition of oxygen gas and powders.
- the lance may comprise an ignition device 32 allowing the heating of the refractory of the degasser device from ambient temperature.
- the powder channel 31 may be fixed and the open structure at the mouth section allows a noise reduction compared to existing types of lances.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00926586A EP1190104B1 (en) | 1999-05-07 | 2000-05-05 | Method of decarburisation and dephosphorisation of a molten metal |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99870098 | 1999-05-07 | ||
EP99870098 | 1999-05-07 | ||
PCT/BE2000/000050 WO2000068442A1 (en) | 1999-05-07 | 2000-05-05 | Method of decarburisation and dephosphorisation of a molten metal |
EP00926586A EP1190104B1 (en) | 1999-05-07 | 2000-05-05 | Method of decarburisation and dephosphorisation of a molten metal |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1190104A1 true EP1190104A1 (en) | 2002-03-27 |
EP1190104B1 EP1190104B1 (en) | 2003-03-05 |
Family
ID=8243835
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00926586A Expired - Lifetime EP1190104B1 (en) | 1999-05-07 | 2000-05-05 | Method of decarburisation and dephosphorisation of a molten metal |
Country Status (14)
Country | Link |
---|---|
EP (1) | EP1190104B1 (en) |
JP (1) | JP2002544376A (en) |
KR (1) | KR20020005741A (en) |
CN (1) | CN1350594A (en) |
AT (1) | ATE233828T1 (en) |
AU (1) | AU4528900A (en) |
BR (1) | BR0011233B1 (en) |
CA (1) | CA2371652A1 (en) |
DE (1) | DE60001576T2 (en) |
ES (1) | ES2193954T3 (en) |
PL (1) | PL353443A1 (en) |
TR (2) | TR200201466T2 (en) |
WO (1) | WO2000068442A1 (en) |
ZA (1) | ZA200108634B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100351399C (en) * | 2001-02-07 | 2007-11-28 | 新日本制铁株式会社 | Method for pig iron melt dephosphorize |
DE102010007119B3 (en) * | 2010-02-05 | 2011-07-28 | Technometal GmbH, 47058 | Vakuumumlaufentgasungsanlage with pilot burner |
CN103966400A (en) * | 2014-04-21 | 2014-08-06 | 鞍钢股份有限公司 | Method for dephosphorization by utilizing RH refining furnace |
JP7052585B2 (en) * | 2018-06-18 | 2022-04-12 | 日本製鉄株式会社 | Dephosphorization method for molten steel |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55107718A (en) * | 1979-02-14 | 1980-08-19 | Nippon Steel Corp | Production of molten steel |
US4426224A (en) * | 1981-12-25 | 1984-01-17 | Sumitomo Kinzoku Kogyo Kabushiki Gaisha | Lance for powder top-blow refining and process for decarburizing and refining steel by using the lance |
AU653294B2 (en) * | 1992-08-26 | 1994-09-22 | Nippon Steel Corporation | Process for vacuum degassing molten steel |
ES2164913T3 (en) * | 1995-08-28 | 2002-03-01 | Nippon Steel Corp | PROCEDURE FOR THE EMPTY OF CAST STEEL EMPTY AND APPLIANCE FOR THE SAME. |
-
2000
- 2000-05-05 WO PCT/BE2000/000050 patent/WO2000068442A1/en not_active Application Discontinuation
- 2000-05-05 EP EP00926586A patent/EP1190104B1/en not_active Expired - Lifetime
- 2000-05-05 DE DE60001576T patent/DE60001576T2/en not_active Expired - Lifetime
- 2000-05-05 KR KR1020017014230A patent/KR20020005741A/en not_active Application Discontinuation
- 2000-05-05 JP JP2000617211A patent/JP2002544376A/en active Pending
- 2000-05-05 ES ES00926586T patent/ES2193954T3/en not_active Expired - Lifetime
- 2000-05-05 TR TR2002/01466T patent/TR200201466T2/en unknown
- 2000-05-05 PL PL00353443A patent/PL353443A1/en unknown
- 2000-05-05 AU AU45289/00A patent/AU4528900A/en not_active Abandoned
- 2000-05-05 AT AT00926586T patent/ATE233828T1/en not_active IP Right Cessation
- 2000-05-05 CA CA002371652A patent/CA2371652A1/en not_active Abandoned
- 2000-05-05 TR TR2001/03025T patent/TR200103025T2/en unknown
- 2000-05-05 CN CN00807279A patent/CN1350594A/en active Pending
- 2000-05-05 BR BRPI0011233-0A patent/BR0011233B1/en not_active IP Right Cessation
-
2001
- 2001-10-19 ZA ZA200108634A patent/ZA200108634B/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO0068442A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2000068442A1 (en) | 2000-11-16 |
TR200103025T2 (en) | 2002-03-21 |
DE60001576T2 (en) | 2004-08-26 |
CA2371652A1 (en) | 2000-11-16 |
ZA200108634B (en) | 2003-01-20 |
ES2193954T3 (en) | 2003-11-16 |
ATE233828T1 (en) | 2003-03-15 |
CN1350594A (en) | 2002-05-22 |
PL353443A1 (en) | 2003-11-17 |
DE60001576D1 (en) | 2003-04-10 |
TR200201466T2 (en) | 2002-07-22 |
BR0011233A (en) | 2002-03-19 |
JP2002544376A (en) | 2002-12-24 |
BR0011233B1 (en) | 2009-01-13 |
KR20020005741A (en) | 2002-01-17 |
AU4528900A (en) | 2000-11-21 |
EP1190104B1 (en) | 2003-03-05 |
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