CN1985010A - Refining molten metal - Google Patents
Refining molten metal Download PDFInfo
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- CN1985010A CN1985010A CN 200580023646 CN200580023646A CN1985010A CN 1985010 A CN1985010 A CN 1985010A CN 200580023646 CN200580023646 CN 200580023646 CN 200580023646 A CN200580023646 A CN 200580023646A CN 1985010 A CN1985010 A CN 1985010A
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Abstract
A method of refining molten metal in a vessel by the reaction of oxygen with impurities in the molten metal comprises the steps of: a) ejecting at least one primary jet of oxygen from a lance positioned above the molten metal into the molten metal to react with impurities therein and to form a layer of molten slag; b) continuing to eject the primary jet of oxygen from the lance and thereby causing the primary bet of oxygen to pass through the slag layer into the molten metal; c) ejecting a plurality of secondary jets of oxygen from the lance, the secondary jet of oxygen travelling for a distance separately from the primary jet of oxygen; and d) entraining the secondary jets of oxygen into the primary jet of oxygen upstream of the entry of the primary jet of oxygen into the molten metal. A lance head for use in the method has at least one primary oxygen port and a plurality of secondary oxygen ports, the axis of the second oxygen port diverging in the direction of flow from the primary oxygen port at an angle of up to 45 DEG . The method and lance head are particularly of use in the Basic Oxygen Steelmaking (BOS) process. If desired, a stirring gas such as argon may be mixed with the primary oxygen.
Description
The present invention relates to a kind of method of refining molten metal.The invention still further relates to a kind of lance head that uses in the method.
One or more strands of oxygen are sprayed into to come refining molten metal in the molten metal be known.For example, steel comes to this and is smelt by iron.In some technology, the molten bath of molten metal is injected in oxygen flow is arranged in molten metal surface below from its top air port.Use the air port can cause the damage of the refractorily lined of refining of metal converter, therefore not ideal.Therefore common way is to spray into the molten metal from the top some or all oxygen flows.Business-like basic oxygen process (BOS) method " blows " to go into the molten metal from the top oxygen flow exactly.Oxygen generates carbon monoxide with the carbon reaction that is dissolved in the molten metal.Oxygen also reacts with the impurity or the minor component (for example silicon) of molten metal, thereby generates slag on molten metal surface.
In general, the speed of the reaction of the carbon in oxygen and for example molten metal does not have any restriction.Therefore wish that oxygen injects the speed maximum in the molten metal.But this speed is subjected to the restriction of practical problems.A problem in these problems is the turbulent size that oxygen causes when injecting in the molten metal.Splash too severely as molten metal, the damage of oxygen blast spray gun is just too severe, thereby needs often to change lance head, so that steel-making cost rises.Molten metal splash too severity also can cause molten metal to spill converter, thereby output descends, the maintenance cost of its upstream device improves.On the other hand,, wish that particularly stage, general last 20% in this blowing in the back have a certain amount of turbulent flow in the molten metal when the mass transfer restriction takes place for ease of the reaction of oxygen and carbon.
As described in EP-A-866138 and the EP-A-866139, one oxygen flow can be brought free air wherein into when flowing through free air as patent application.This brings the speed that causes this oxygen flow and the reduction of thrust into.It is said,, must place lance head on the position than the more close molten metal surface of ideal position, so the molten metal that spray gun is splashed first watch easily damages because this brings into.EP-A-866138 and EP-A-866139 propose, and in fact lance head becomes a burner.Still have one from the primary jet of oxygen of spray gun with supersonic speed ejection, but this primary jet of oxygen existing by secondary flame envelope around.This pair flame envelope is formed with secondary oxygen combustion by the combustion gas (or combustion liquid) from the lance head ejection.This combustion gas and secondary oxygen mix generate flame.This flame envelope is used for allegedly preventing that free air from bringing in this oxygen flow.Therefore disperse it is said when this oxygen flow is unlike no flame envelope or lose speed.Therefore, reacted with the carbon that is dissolved in the molten metal depths under this oxygen flow can be penetrated into molten metal surface.In addition, lance head can place the molten metal upper foot so that its wear rate remains on the interior position of tolerance interval.
Although this theoretical plausibility, we think its too high shortcoming of estimating existing way.In addition, the generation of flame envelope has a very big shortcoming, promptly must be to supply combustion gas of the spray gun on the top or combustion liquid.The severity of this shortcoming is looked the difference of institute's melt metal or refining process and difference.For example this shortcoming is very serious in the BOS method, because according to EP-A-866138 and EP-A-866139, the supply of fuel that special usefulness generates flame envelope must be set atop.This says so from engineering and be difficult to realize, and is special because spray gun must move on two positions up and down usually.In addition, the possibility that molten metal absorbs hydrogen improves greatly, and this steel to many grades is unacceptable.
We think that the ability of improving oxygen blast technology in refining of metal depends on that improving the speed that produces the oxygenant that is used for reacting does not cause increase spray gun wear rate simultaneously.
According to the present invention, a kind of method that is reflected at refining molten metal in the converter by the impurity in oxygen and the molten metal is provided, wherein, the molten metal of certain volume is arranged in this converter, this method comprises the following steps:
A) from the spray gun that is arranged in molten metal top one primary jet of oxygen at least inject molten metal with the impurity reaction of molten metal generation one deck molten slag;
B) continue to spray this primary jet of oxygen from this spray gun, make this primary jet of oxygen inject in the molten metal through this slag layer;
C) from the secondary jet of this lance ejection multiply oxygen, secondary jet of this oxygen and the primary jet of oxygen certain distance of advancing dividually; And
D) the secondary jet of this oxygen is brought in this primary jet of oxygen in the upstream that primary jet of oxygen is injected the molten metal of this volume.
The present invention also provides a kind of use lance head in the method, this lance head has at least one primary oxygen port and a plurality of secondary oxygen port, each secondary oxygen port links to each other with one of this primary oxygen port or primary oxygen port, and its axis is dispersed from the oxygen port corresponding with it on air flow line and reached 45 ° angle.
We believe that available the inventive method and spray gun shorten the required time of carbon content of reducing in the certain volume molten metal.We believe that also initial gas pressure, speed and the flow rate that needn't improve main oxygen can draw this result, thereby are corroded very soon or the risk damaged reduces than existing method lance head.The raising of the air pressure of main oxygen, speed and flow rate also can cause some molten metals and slag to spray from converter, thereby causes output to reduce and maintenance issues.Being also advantageous in that of the inventive method and spray gun needn't be to the spray gun fuel supplying, thus the supply of fuel that need not to push up, and for example supply of fuel on the required top of fuel gas flow is shrouded in EP-A-866 138 and EP-A-866 139 described formation.
The inventive method and spray gun are particularly useful for basic oxygen process (BOS) method, but also can be used for the technology of some other steelmaking process and some refining non-ferrous metal.
In the step (a) of the inventive method with (b), described primary jet of oxygen preferably all sprays from spray gun with ultrasonic axial velocity.In this two step, but use range is the ultrasonic velocity of 1.5-3 Mach.
For realizing each secondary oxygen jet bringing on the suitable medium position of the power stream corresponding with it, each secondary jet is dispersed from the longitudinal axis of the power stream corresponding with it on air flow line and is reached 45.
Each secondary oxygen jet with its corresponding primary oxygen jets between the preferred angle of divergence be 5-25 °, decide on the absolute velocity of this pair oxygen jet and with the speed of relative movement of primary oxygen jets.The particularly preferred angle of divergence is 10-20 °.
The general secondary oxygen jet of 2-8 thigh that uses preferably uses the secondary oxygen jet of 2-6 thigh.The exact quantity of secondary oxygen port is decided with the ratio of secondary Oxygen Flow by the main oxygen stream of hope.For example, secondary Oxygen Flow can be 50% of main oxygen stream, and can use 12 secondary oxygen port this moment.Secondary Oxygen Flow is generally the 5-50% of main oxygen stream.
Each secondary oxygen port with its corresponding primary oxygen port between linear interval be generally less than the twice of primary oxygen port diameter.
It is thin that each secondary oxygen jet cans be compared to primary oxygen jets most.
Each secondary oxygen jet is preferably advanced separated from each otherly, and they are brought in the primary oxygen jets.
For example, in basic oxygen process, lance head generally is immersed in the slag layer in described step (b).In this example and other example of basic oxygen process, the multiply primary oxygen jets is arranged, each primary oxygen jets links to each other with one or more strands of secondary oxygen jets.Relation between each primary oxygen jets and the coupled secondary oxygen jet can be: make can use in the above-mentioned general or preferred feature any one or all.
As use the multiply primary oxygen jets, they are generally from roughly being distributed in the primary oxygen port ejection of (or on another closed geometric periphery) on the circumference.Secondary oxygen port generally is distributed in the outside of primary oxygen port.
Preferably, each primary oxygen port has one group of secondary oxygen port that is attached thereto, and every group of secondary oxygen port is distributed on the circular arc or circumference of a circle.Described circle is concentric with the circle at this primary oxygen port place.This circular arc right angle be generally less than 180 °.
In the present invention's one preferred lance head, the described angle of divergence between secondary oxygen port and the coupled primary oxygen port is generally 45 °, is preferably 5-25 °, more preferably 10-20 °.Each primary oxygen port preferably links to each other with the individual secondary oxygen port of one group of 1-8 (more preferably 2-8).Linear interval between each secondary oxygen port and the coupled primary oxygen port is preferably less than the twice of primary oxygen port diameter.Primary oxygen port and each secondary oxygen port preferably are positioned on the top of lance head.
Be applicable in the preferred lance head of BOS method have a plurality ofly to be distributed in primary oxygen port on the circumference around the lance head axis one.These primary oxygen port preferably are positioned on the annular slope of lance head, and this annular slope has a guiding inner periphery limit, makes the longitudinal axis of these primary oxygen port disperse mutually on the direction of oxygen flow.Preferably to a plurality of secondary oxygen port should be arranged, all these secondary oxygen port all are formed on the described ring surface each primary oxygen port.
In the present invention's one preferred lance head, each primary oxygen port is convergence-divergent nozzles form, and each oxygen jet is from the top ejection of this lance head.
Lance head of the present invention generally is useful on for example pipeline of current of coolant flow.
In some preferred embodiment of lance head of the present invention, all primary oxygen port and secondary oxygen port are communicated with common chamber in the lance head.The advantage of this class embodiment is that physical construction is simple.In other preferred embodiment of lance head of the present invention, being communicated with in each primary oxygen port and the lance head with the disconnected chamber of secondary oxygen port.The advantage of these embodiment is to be independent of speed and the flow rate that main oxygen is controlled secondary oxygen.
Preferably also carry out following steps in many cases in the methods of the invention:
E) will form power stream and/or secondary effusive oxygen mixes with at least a injected upstream stirring gas.
In the known way of using known spray gun, only the pure oxygen that commerce is obtained is blown in the molten metal under ultrasonic velocity.Flow rate and speed are chosen to finish refinery process in the shortest time and do not cause the over-drastic turbulent flow and splash.According to the present invention, comprise that in power stream to stir gas be for the ease of the dissolved carbon in molten metal and pass metallurgical reaction between the oxygen of molten metal surface.In addition, use secondary jet that the fill rat of additional oxygen and main oxygen can be provided, secondary oxygen and stirring gas may be selected to and makes oxygen import total speed maximum, guarantee that simultaneously the power of giving of power stream is not increased to the unacceptable degree of splashing of meeting generation.
Stir gas if use, power stream preferably is pre-mixed by stirring gas and oxygen and forms.
Stir gas and be preferably rare gas element, particularly argon.But for some other steel of level, can be nitrogen as stirring gas, only otherwise steel is produced harmful effect.
Stir gas if use, the composition of described primary oxygen jets can be constant in whole one heat steel water.Its composition also can change, in the one heat steel water at a time or some constantly can increase.In fact, begin initiatively not add stirring gas.(always having some argons to exist in the oxygen) as impurity.Usually therefore the demand maximum to stirring when one heat steel water finishes soon stirs in the final section that the molfraction of gas in power stream be preferably in this stove molten steel (be generally last 1/5) than big at the first half of this stove molten steel.In fact, can after the supply of interrupting oxygen, continue supply and stir gas.
Illustrate the inventive method and each embodiment of lance head of the present invention below in conjunction with accompanying drawing, in the accompanying drawing:
Fig. 1 is the synoptic diagram of a BOS converter of enforcement the inventive method;
Fig. 2 is the end view of the present invention's first spray gun;
Fig. 3 is for to cut open the sectional view of getting along N-N line among Fig. 2;
Fig. 4 is the side-view of lance head shown in Figure 2;
Fig. 5 is the end view of the present invention's second spray gun; And
Fig. 6 is for to cut open the sectional view of getting along M-M line among Fig. 5.
Referring to Fig. 1 of accompanying drawing, this illustrates a basic oxygen process (BOS) converter 102.This converter 102 has the refractorily lined (not shown).In the work, a stove fused iron is housed in this converter.The molten pig of representing this volume among Fig. 1 with label 106.Molten pig and oxygen reaction and by refining.With vertical spray gun 110 supply oxygens that head 112 is arranged.Spray gun 110 is generally made with stainless steel, and main mouthful 114 of a plurality of ejection oxygen arranged on its head 112.Mouthfuls 114 are communicated with oxygen channel 115 in the spray gun 110.Also have the refrigerant of confession (being generally water) mobile pipeline 116 therein in spray gun 110 and the head 112, prevent that its high temperature by BOS converter 102 from burning out.Spray gun 110 also connects with the spray gun Manipulators (not shown) of a liftable spray gun 110.General way is that spray gun 110 is operated on two positions.The one, so-called " soft blow " position, on this position, spray gun 110 tops are far away from molten metal surface; Another position is so-called " blowing firmly " position, and on this position, near molten metal surface, lance head 112 is formed on when generally being immersed in the molten metal refining in the molten metal 106 lip-deep molten slags 118 on spray gun 110 tops.One of advantage of the inventive method is that the spray gun position need not to change in soft blow and between blowing firmly as usually.
The inventive method also can be used for the spray gun that its position is dynamically controlled according to carbon-drop rate and other factors.This is dynamically controlled is known.
When molten pig begins refining by at locational lance head 112 supply oxygens of soft blow.Oxygen sprays under the ultrasonic velocity that is generally 1.5-3 Mach from lance head 112.Be supplied to the temperature of the oxygen of lance head to be generally 0-50 ℃.Oxygen need not preheating, but because the envrionment temperature of BOS converter is much higher than normal room temperature usually, so oxygen obtains a little preheating naturally.The supply air pressure of oxygen is generally 5-20bar, and it can be sprayed from lance head under ultrasonic velocity.Main oxygen penetrates carbon and other impurity such as silicon and the reaction of Salmon-Saxl in molten metal 106 surfaces and the molten metal.The chemical process of steel-making is known, need not here to give unnecessary details.Here need only point out, the avidity that is dissolved in carbon in the pool of molten metal and oxygen is very high, therefore react the generation carbon monoxide rapidly with oxygen, and other impurity generates the molten slag lighter than melting black metal with oxygen reaction, form molten slag layer thereby rise to the surface.The speed of main oxygen is for making the disturbance molten metal, the general turbulent flow that forms to a certain degree on molten metal surface.Slag layer 118 also is disturbed, and wherein has in a large number by the carbon monoxide bubble that is dissolved in carbon and oxygen reaction generation in the melting black metal.
After generating slag layer, require to improve the carbon-drop rate of molten metal.Therefore spray gun 110 is dropped to it blows the position firmly, and this moment, its head 112 was immersed in (this position just shown in Fig. 1) in the molten slag 118.Under ultrasonic jet velocity, supply main oxygen in the stage of blowing firmly.In addition, according to the present invention, also supply secondary oxygen.When needing or as the inevitable outcome of this lance head configuration, can supply secondary oxygen, thereby help to generate slag in the soft blow stage.Some different choice are arranged.For example, can improve the flow rate and the speed of main oxygen from the soft blow stage to stage of blowing firmly.
The general multiply primary oxygen jets of using, each primary oxygen jets links to each other with the secondary oxygen jet of multiply.Fig. 1 illustrates one primary oxygen jets 120.Primary oxygen jets 120 is dispersed on the oxygen flow direction.Two strands of secondary oxygen jets 122 shown in Fig. 1.Secondary oxygen jet 122 is advanced separated from each otherly.They are dispersed from primary oxygen jets 120.The angle of divergence can from 0 to 45 °, decides on the absolute velocity and the speed of relative movement of primary oxygen jets and secondary oxygen jet.In general, the absolute and relative speed of secondary oxygen jet is low more, and the angle of divergence can be big more.The purpose of the angle of divergence is to guarantee that most of secondary jet back is brought in the primary jets upstream of molten metal surface.But, prevent that preferably this from bringing the top end that occurs in too close lance head itself into.The angle of divergence is too little will this thing happens.On the other hand, if the angle of divergence is too big, secondary oxygen jet may just continue to disperse, and does not bring in the power stream just to disappear, thereby is not penetrated in the molten metal.The angle of divergence is preferably 5-25 °, more preferably 10-20 °.
Carbon content in the molten metal is reduced to the contact rate that the preset value required time is decided by oxidizer molecule and dissolved carbon molecule.The contact rate that improves oxidizer molecule and dissolved carbon just can reduce refining time.Therefore, it is favourable using the secondary oxygenant of quite big quantity.In general, secondary oxidizer-flow rate can be 50% of primary oxidant stream.
If main oxygen and secondary oxygen flow through same chamber in lance head, then the speed of secondary oxygen jet just can't be independent of power stream speed and freely sets; Because it is thinner than power stream usually to produce secondary effusive pipeline, therefore " frictional dissipation " that links to each other with secondary jet is bigger, so its speed is slightly littler than primary oxygen jets speed.In this example, secondary jet generally with the velocity of sound but under the condition of underexpansion from the secondary duct ejection, thereby cause the instant sharp pounding of hypersonic air flow state and consume a series of shock waves of effusive kinetic energy.On the other hand, if secondary oxygen sprays from the source of oxygen different with main oxygen, the change degree of freedom of secondary oxygen velocity just improves greatly.In general, be significantly smaller than the secondary oxygen velocity of main oxygen speed, easily secondary jet brought in the main oxygen.
Can blow firmly in the stage or argon or other are stirred gas join in the primary oxygen upstream of spray gun 110 whole blow over firmly in the journey.Generally the flow rate with the secondary oxygen of use is identical for the intake rate that adds of stirring gas.Whole the blowing in the stage firmly that total air flow in the adding power stream is preferably in one heat steel water remains unchanged.Stirring gas can be with not variable Rate supply in the whole process of one heat steel water, or can be about to finish at one heat steel water, the content of dissolved carbon supplies during near preset value.Stirring gas can replace some main oxygens and be supplied to power stream.
When the carbon content in the ferrous metal was reduced to preset value, spray gun 110 was extracted in the supply that can stop oxygen (main oxygen and secondary oxygen) and stir gas out from steel-making converter 102.Can from converter 102, emit molten metal as is known then.
The ability of selecting to stir the gas supply moment and quantity can make steelmaking process the best.When one heat steel water began to blow firmly, carbon content was higher, replaced oxygen only can prolong refining time with stirring gas.When one heat steel water was about to finish, this moment, carbon content was low, and it is just favourable that gas is stirred in adding.
Fig. 2-4 illustrates the structure of first lance head 200 that uses in the methods of the invention.Shown in Fig. 2-4, there is a nose 202 on lance head 200 front ends or top 204.Nose 202 by annular slope 206 around, the inner periphery limit of this annular slope is more forward than circumferential periphery.As shown in Figure 2,4 primary oxygen port 208 are arranged on the annular slope 206.The axis of each primary oxygen port 208 is vertical with this inclined-plane.Therefore the axis of each primary oxygen port 208 relative lance head 200 longitudinal axis on the oxygen flow direction own are dispersed.This angle of divergence is generally 5-15 °.These oxygen port 208 are equally distributed on the circumference.Deposit primary oxygen jets at this cloth and penetrate molten metal surface, thereby help the diffusion of oxygen at 4 different sites.When needing, but usage quantity is than more than 4 or few primary oxygen port 208.
Each primary oxygen port 208 constitutes the terminal that is formed on the convergence-divergent nozzles 210 in the lance head 200.Nozzle 210 comprises the pars intermedia 214 that upstream convergent portion 212, diameter are constant and disperses portion 216.Convergent portion 212 is communicated with the oxygen room 218 of stretching out from lance head 200.This convergence-divergent nozzles (being sometimes referred to as the Laval nozzle) can spray the oxygen that under high pressure is supplied to chamber 218 with ultrasonic velocity.Fully expand when preferably convergence-divergent nozzles 210 being designed to oxygen from primary oxygen port 208 ejections.
Each primary oxygen port links to each other with a plurality of secondary oxygen port 220.As shown in Figure 2, each primary oxygen port 208 is corresponding with 2 secondary oxygen port 220.Each secondary oxygen port 220 is formed on the annular slope 206.Secondary oxygen port 220 is all between the circumferential periphery of primary oxygen port 208 and ring surface 206.The diameter of each secondary oxygen port 220 is significantly smaller than primary oxygen port 208.The axis of the axis of each secondary oxygen port 220 corresponding with it relatively primary oxygen port 208 on the oxygen flow direction is dispersed.Be met in conjunction with the described standard of Fig. 1 more than needing only, this angle of divergence can reach 45 °.But this angle of divergence is generally 5-25 °, is more generally 10-20 °.
Each secondary oxygen port 220 is positioned on the terminal of secondary oxygen channel 222.Each secondary oxygen channel 222 is formed with upstream leg 224 and downstream leg 226.Downstream leg 226 preferably and upstream leg 224 at angle.Each upstream leg 224 is communicated with chamber 218.As shown in Figure 3, the diameter of downstream leg 226 is littler than upstream leg 224.But when needing, can use opposite setting: the diameter of upstream leg 224 is littler than downstream leg 226.This can use in the time will reducing secondary oxygen jet speed.Pipeline 222 generally all forms hole or countersunk.
For ease of explanation, shown in 208 of each primary oxygen port link to each other with two secondary oxygen port 220.But each primary oxygen port 208 generally links to each other with plural secondary oxygen port 220.Therefore, each primary oxygen port 208 generally links to each other with 2-8 secondary oxygen port 220.Every group of secondary oxygen port 220 preferably is distributed on the circumference of a circle, and this circle is concentric with the axis of the described primary oxygen port that links to each other 208.Oxygen jet from its ejection when the spacing of secondary oxygen port 220 is arranged so that work does not converge mutually.Every group of secondary oxygen port 220 generally be arranged to these mouthfuls 220 around whole circumference extend but corresponding to less than 360 °, usually less than on 180 ° the circular arc.
Lance head 200 is formed with around the one inner sleeve 228 of oxygen room 218 and one outer sleeve 230.Sleeve 228 and 230 forms for refrigerant when the lance head works better, is generally water mobile pipeline in lance head.These pipelines stretch in the nose 202 of spray gun 200.
Lance head 200 can weld or otherwise liquid thickly be fixed on the spray gun (not shown among Fig. 2-4) with three concentric pipe, internal pipeline is an oxygen channel, other two pipelines are main coolant pipe.Be used for behind the many stove molten metals of refining lance head 200 essential replacings.This need only weld upward new lance head behind the exhausted lance head down from the spray gun cutting.
The working condition of lance head shown in Fig. 2-4 is basically as described in conjunction with Fig. 1.The secondary oxygen jet of bringing in each primary oxygen jets has strengthened and the tight decarburizer stream that contacts of institute's refining molten metal.Therefore compare with the common way refining of only using primary oxygen jets, the molten metal required time of the given volume of given composition shortens.The burning of carbon monoxide being brought into the secondary oxygen that causes in the secondary oxygen jet is unimportant for purposes of the invention.
Because secondary oxygen port 220 is communicated with oxygen room 218, secondary oxygen jet is generally with velocity of sound ejection, underexpansion state when spraying owing to it and the differential pressure between the converter environmental stress and expand into ultrasonic velocity rapidly.This ultrasonic velocity is because " friction " interaction between the wall of flow oxygen and secondary oxygen channel 222 and less than the spouting velocity of primary oxygen jets.
Fig. 5 and 6 illustrates another embodiment of lance head.Among Fig. 5 and 6 with Fig. 2-4 in corresponding components represent with same numeral.Total identical of the structure of Fig. 5 and lance head shown in 8 and working condition with lance head shown in Fig. 2-4.The main difference of two embodiment is, in lance head shown in Fig. 5 and 6, secondary oxygen channel 222 and is around chamber 218, co-axial annular secondary oxygen room 300 is communicated with it.Therefore, the spouting velocity of secondary oxygen is independent of the speed of main oxygen from the lance head ejection.Therefore, when needing, secondary oxygen can be greater than the ultrasonic velocity of main oxygen speed, ultrasonic velocity, the velocity of sound or subsonic speed ejection less than main oxygen speed.An advantage of secondary oxygen subsonic speed is to be convenient to secondary oxygen jet is brought in the main oxygen.
Can make all changes and correction to lance head.For example, when needing, lance head can form the hole on the wall in oxygen room on its near-end, make the oxygen of part ejection be used for BOS away from the position of molten metal surface on carry out the afterfire of carbon monoxide.Other embodiments of the invention are conspicuous for those of ordinary skills.Scope of the present invention is seen following claim.
Claims (32)
1, a kind ofly be reflected at the method for refining molten metal in the converter by the impurity in oxygen and the molten metal, wherein, the molten metal of certain volume arranged in this converter, this method comprises the following steps:
A) from the spray gun that is arranged in molten metal top one primary jet of oxygen is at least sprayed into molten metal with generation one deck molten slag with the impurity reaction of molten metal;
B) continue to spray this primary jet of oxygen from this spray gun, make this primary jet of oxygen inject in the molten metal through this slag layer;
C) from the secondary jet of this lance ejection multiply oxygen, secondary jet of this oxygen and the primary jet of oxygen certain distance of advancing dividually; And
D) the secondary jet of this oxygen is brought in the upstream primary jet of oxygen of the molten metal that primary jet of oxygen injects this volume.
By the described method of claim 1, it is characterized in that 2, in step (b), described primary jet of oxygen is with the ultrasonic velocity ejection of 1.5-3 Mach.
3, by the described method of above-mentioned arbitrary claim, it is characterized in that each secondary effusive longitudinal axis is dispersed 45 from the longitudinal axis of coupled power stream on direct of travel.
4, by the described method of claim 3, it is characterized in that described angle is 5-25 °.
5, by claim 3 or 4 described methods, it is characterized in that described angle is 10-20 °.
By the described method of claim 5, it is characterized in that 6, each primary oxygen jets is connected with the secondary oxygen jet of 2-6 thigh.
7, by the described method of above-mentioned arbitrary claim, it is characterized in that lance head is immersed in the slag layer in described step (b).
By the described method of above-mentioned arbitrary claim, it is characterized in that 8, each oxygen jet is from the top ejection of this spray gun.
9, by the described method of above-mentioned arbitrary claim, it is characterized in that the multiply primary oxygen jets is arranged, each primary oxygen jets links to each other with one or more strands of secondary oxygen jets.
By the described method of claim 9, it is characterized in that 10, primary oxygen jets is from roughly being distributed in the primary oxygen port ejection on the circumference.
By the described method of claim 10, it is characterized in that 11, secondary oxygen jet is from being distributed in the secondary oxygen port ejection of primary oxygen jets outside.
By the described method of claim 11, it is characterized in that 12, each primary oxygen port has one group of coupled secondary oxygen port, every group of secondary oxygen port is distributed on the circular arc of a circle.
13, by the described method of claim 12, it is characterized in that described circle is concentric with the circle at this primary oxygen port place.
By the described method of above-mentioned arbitrary claim, it is characterized in that 14, secondary Oxygen Flow is the 5-50% of main oxygen stream.
15, by the described method of above-mentioned arbitrary claim, it is characterized in that, also comprise the following steps: to mix with the upstream stirring gas of at least a injection forming power stream and/or secondary effusive oxygen.
16, by the described method of claim 15, it is characterized in that this stirring gas is rare gas element.
17, by the described method of claim 16, it is characterized in that this stirring gas is argon.
By the described method of arbitrary claim among the claim 15-17, it is characterized in that 18, this stirs gas and only mixes with main oxygen in the later stage of one heat steel water.
By the described method of claim 18, it is characterized in that 19, the flow rate that stirs gas is less than or equal to the flow rate of secondary oxygen.
20, a kind of lance head that is used for the described method of above-mentioned arbitrary claim, this lance head has at least one primary oxygen port and a plurality of secondary oxygen port, each secondary oxygen port links to each other with one of this primary oxygen port or described primary oxygen port, and its axis coupled relatively primary oxygen port on air flow line is dispersed 45 ° angle.
21, by the described lance head of claim 20, it is characterized in that described angle is 5-25 °.
22, by claim 20 or 21 described lance heads, it is characterized in that described angle is 15-20 °.
23, by the described lance head of arbitrary claim among the claim 20-22, it is characterized in that a plurality of primary oxygen port are arranged, each primary oxygen port links to each other with one group of 1-8 secondary oxygen port.
By the described lance head of claim 23, it is characterized in that 24, every group of secondary oxygen port is distributed on the circular arc of a circle, this circle is with concentric with described group of primary oxygen port that links to each other.
25, by the described lance head of claim 24, it is characterized in that, described circular arc right central angle less than 180 °.
26, by the described lance head of arbitrary claim among the claim 20-25, it is characterized in that the linear interval between each secondary oxygen port and this primary oxygen port is less than the twice of this primary oxygen port diameter.
By the described lance head of arbitrary claim among the claim 20-25, it is characterized in that 27, this primary oxygen port and each secondary oxygen port are positioned on the top of lance head.
28, by the described lance head of arbitrary claim among the claim 20-27, it is characterized in that having a plurality ofly to be distributed in primary oxygen port on the circumference around the lance head axis.
29, by the described lance head of arbitrary claim among the claim 20-28, it is characterized in that secondary oxygen port is distributed in the primary oxygen port outside.
30, by the described lance head of arbitrary claim among the claim 20-29, it is characterized in that, primary oxygen port is positioned on the annular slope of lance head, and this annular slope has guiding inner periphery limit, makes the longitudinal axis of these primary oxygen port disperse mutually on the direction of oxygen flow.
By the described lance head of arbitrary claim among the claim 20-30, it is characterized in that 31, all primary oxygen port and secondary oxygen port are communicated with common chamber in the lance head.
32, by the described lance head of arbitrary claim among the claim 20-30, it is characterized in that being communicated with in each primary oxygen port and the lance head with the disconnected chamber of secondary oxygen port.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0410835A GB0410835D0 (en) | 2004-05-14 | 2004-05-14 | Refining molten metal |
| GB0410835.3 | 2004-05-14 | ||
| GB0425540.2 | 2004-11-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1985010A true CN1985010A (en) | 2007-06-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200580023646 Pending CN1985010A (en) | 2004-05-14 | 2005-05-12 | Refining molten metal |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1985010A (en) |
| GB (1) | GB0410835D0 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113532111A (en) * | 2021-07-19 | 2021-10-22 | 黄石市泓义城市矿产资源产业研究院有限公司 | Adjustable oxygen supply system and method for oxygen-enriched smelting furnace |
-
2004
- 2004-05-14 GB GB0410835A patent/GB0410835D0/en not_active Ceased
-
2005
- 2005-05-12 CN CN 200580023646 patent/CN1985010A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113532111A (en) * | 2021-07-19 | 2021-10-22 | 黄石市泓义城市矿产资源产业研究院有限公司 | Adjustable oxygen supply system and method for oxygen-enriched smelting furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0410835D0 (en) | 2004-06-16 |
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Application publication date: 20070620 |