CN102212638B - Refining method of molten iron in ladle and devices required by same - Google Patents
Refining method of molten iron in ladle and devices required by same Download PDFInfo
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- CN102212638B CN102212638B CN 201110122211 CN201110122211A CN102212638B CN 102212638 B CN102212638 B CN 102212638B CN 201110122211 CN201110122211 CN 201110122211 CN 201110122211 A CN201110122211 A CN 201110122211A CN 102212638 B CN102212638 B CN 102212638B
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention belongs to the black metallurgy field and particularly relates to a molten iron refining method for treating and desulfurizing molten iron outside the furnace in a ladle, and devices required by the same. The desulfurizing process is performed by applying a low electric potential in melt (5); and the way of forming the low electric potential is that one pole of a power supply (1) applies current on the molten iron space of the outlet of a spray gun (2) through the spray gun, and the other pole of the power supply (1) provides current through a conductive electrode (6) soaked in molten iron. The method for forming the low electric potential comprises the following steps: the conductive electrode (6) is soaked in molten iron to ensure that the electrode is at 5-15% of the height of molten iron, the conductive electrode (6) is moved into slag after the first half of converting and is at 40-60% of the depth of slag, and current is applied on the power supply (1) under the condition that the voltage is 10-60V. By adopting the refining method, the utilization rate of desulfurizer for direct desulfurization can be increased, heat loss can be reduced, and the number of iron particles can be lowered so as to increase the yield of qualified molten iron.
Description
Technical field
The invention belongs to the ferrous metallurgy category, relate in particular in a kind of bag that in hot metal ladle, carries out processing outside the stove desulfurizing iron molten iron method of refining and implement the required equipment of this method.
Background technology
Known useful powder material is the method for desulfurizing iron, such as with magnesium or magnesium based mixtures (limy, carbide of calcium, rhombspar, and other adds composition), mixture can improve bag top slag take in sulphur ability (Sulfur capacity), realize that the used equipment (seeing Fig. 1) of aforesaid method comprises the gauger (101) of band material feeder (201), spray sweetening agent and monitoring feeding system (301), submerged type refractory lance and the tubulose interior passageway (401) made from metallic substance thereof, the gun shot that mobile spray gun is used (501), sweetening agent feed pipeline (601) (connecting spray gun and dispensing mechanism), hot metal ladle splash guard (701), dust excluding hood (801) and supervisory control desk are [referring to Warren promise baby H.A. " be desulfurizing iron with magnesium " ,-M; " metallurgy " ,-1980-177～178 page, 208～211 pages].The capacity of hot metal ladle is determining the degree of depth and the corresponding magnesium vaporization possibility of in-built molten iron, thereby has also determined at vaporizing chamber of spray gun channel outlet band (for the following hot metal ladle of 160t) or stillization chamber (to large capacity molten iron Bao Eryan).
Although this method and apparatus by wide-scale adoption, uses or certain shortcoming is arranged, select it and want the person to have:
1, sweetening agent is not fully absorbed, and relevant is that utilization ratio and the limit operating availability of directly using in the desulfurization also has gap therewith;
2, hot metal temperature drop is obvious during the processing, comprises molten iron processing time length length in a crucial factor;
3, enter slag with the abrasive grit form and the iron loss lost with skimming is quite large after end treatment.
In view of above-mentioned, eliminate these shortcomings and guarantee that obtaining new benefit is the problem that the present invention will solve.
Summary of the invention
The present invention is intended to overcome the deficiencies in the prior art part and a kind of utilization ratio that sweetening agent is directly used in sulphur removal that can improve is provided, reduce thermosteresis, the quantity of abrasive grit is with molten iron method of refining in the bag that improves qualified molten iron output capacity and implement the required equipment of this method in the reduction slag.
For achieving the above object, the present invention is achieved in that
Molten iron method of refining in a kind of bag by the spray gun that metal tube is arranged in the refractory lining is arranged outward, adopts the inert gas jets mode that Powdered sweetening agent is blown into and carries out desulfurization in the hot metal ladle, and sweetening process is carried out apply low pressure electromotive force situation in melt under.
As a kind of preferred version, the approach that the present invention sets up the low pressure electromotive force is to apply electric current by spray gun to the molten iron space of spray gun outlet position from the utmost point of power device, and another utmost point of described power device then provides electric current by the conductive electrode that slips in the molten iron.
As another kind of preferred version, the present invention slips into described conductive electrode in the molten iron first, after finishing the first half term of blowing electrode is moved into and applies electric current in the slag blanket.
Further, the present invention slips into described conductive electrode first in the molten iron and in 5～15% degree of depth of molten iron height, after finishing the first half term of blowing, move into conductive electrode in the slag blanket and be in 0.4～0.6 degree of depth of slag blanket height, applying electric current in magnitude of voltage 10～60V situation on the power device.
Further, the present invention adds the electric current system and adds the sweetening agent system and coordinate mutually (в
в р e ж и м e с о г л а с о в а н н о м с
р e а г e н т а .), start from spray gun and slip into moment of boundary on the melt and after the finally sweetening agent spray 20～120 seconds.
In addition, the present invention is applying the end stage of electric current, the polarity of switching current on its time span of 5～20%.
Secondly, the present invention adds the material that can improve Sulfur capacity and specific conductivity in the second half of blowing in the molten iron cinder inclusion.
Again, the material that improves Sulfur capacity and specific conductivity of the present invention is lime-carbon granule or agglomerate.
Molten iron method of refining required equipment in a kind of above-mentioned bag, it comprises: power device, test tank, the spray gun with metal tube, hot metal ladle and conductive electrode; One utmost point of described power device and the metal tube in the spray gun join, and the port of its another utmost point and conductive electrode joins; Described spray gun and conductive electrode are inserted in the hot metal ladle.
As a kind of preferred version, the present invention also can be provided with signal conditioning circuit; The port of described power device connects the power delivery port of signal conditioning circuit; Metal tube in the described spray gun and the port of conductive electrode join with the signal transmission port of signal conditioning circuit respectively.
Further, the present invention can fixedly be furnished with auxiliary sweetening agent filling tank body on the top of described hot metal ladle.
Compared with prior art, the present invention has following features:
Import electric current by the spray gun that slips into the molten iron depths at its outlet position, owing to accelerated importing or the derivation speed of electronics, thus strengthened the effect of potential energy to desulphurization reaction chemistry component.Bubbles of carrier gas is in effective stirring of sweetening agent feed zone, in strengthening fluid kinetic exchange process, refining process is converted into active status exchange from the dispersion state exchange, this just helps whole molten iron space in the bag is all attracted sweetening process, finally be to have accelerated desulfuration operations, guaranteed the utilization ratio that reduces temperature loss and improved sweetening agent.
The blowing first half term the lower end of electrode directly be put in the molten iron be because, the not yet sensed or preliminarily forming only of the slag of this moment, and because the also fully dissolving of Powdered sweetening agent, the trickling degree of molten iron still deficiency so that each component of slag positive sweetening process that identifies oneself with all.
Directly in slag, have an electrode just to attract slag system to enter into refining process and come, and since the polarity of electric current to the effect of charged ions or complex compound, guaranteed the impurity in the metal is transferred to and is fixed in the slag.
Making current in during certain before sweetening agent is reinforced or after reinforced because the cause of heat release helps to reduce spray gun outlet molten iron and condenses, has prevented that the outlet from diminishing and the reduction of sweetening agent flow.The shortest time value that adds electric current depends on that actual beginning of galvanic action occurs, maximum time value then determined along with the above-mentioned action effect of the prolongation of time descends, continue again afterwards to add just necessity no longer of electric current.
Add in the slag and adjust material and not only can improve slag and hold the ability of sulphur and fully make the desulfurizing iron refining, also for the specific conductivity that improves slag provide may, this is more effective condition of utilizing potential power, also is the front topic of reduction electric energy expense.
Purpose in the process end stage reverse of polarity is physics, the chemical property (viscosity, surface tension) that changes slag, and the quantity of metal in the dreg grain just depends on the physicochemical characteristic of slag, thereby the output capacity of qualified molten iron also depends on this.
(10～60V) selection then is that the effect demonstration of electromotive force is very weak when being lower than minimum value (10V) owing to index to the limit voltage value, and (60V) then is subject to personnel's safety condition when surpassing maximum value.
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments.Protection scope of the present invention not only is confined to the statement of following content.
Fig. 1 is not for adopting the blowing desulfurization agent Desulfuring Device of Hot Metal schematic diagram of low pressure electromotive force;
Fig. 2 is for adopting the blowing desulfurization agent Desulfuring Device of Hot Metal schematic diagram of low pressure electromotive force.
Among the figure: 1 is power device; 2 is spray gun; 3 is metal tube; 4 is hot metal ladle; 5 is melt; 6 is conductive electrode; 7 is slag blanket; 8 is the monitoring and detection element; 9 is steady resistance; 10 is tie cable; 11 is test tank; 12 auxiliary sweetening agent filling tank bodies.
Embodiment
The present invention has considered to carry out the characteristics of sweetening process in hot metal ladle,, adopt gas-jet supply sweetening agent that is, and jet is also strengthened wrapping the stirring of interior molten iron, thereby accelerated obversion heat transfer process and refining process except conveying function.
Proposed present method for solving this problem spy, comprised and adopt carrier gas jet by submerged type spray gun (inserting in the gun body-metal tubing) sweetening agent to be fed in the molten iron.The difference of this method is:
In molten iron, apply a low pressure electromotive force when carrying out desulfurization, form the electromotive force way and be from the utmost point of power supply and provide an electric current by spray gun to the molten iron space at spray gun outlet position, place, from another utmost point then by a conductive electrode (with its slip into the molten iron degree of depth 5～15%) provide electric current, then, after finishing the blowing first half term, it is shifted on 0.4～0.6 the level that is in the slag blanket height in the slag.Power device magnitude of voltage 10～60V when adding electric current, the system that adds electric current with add the sweetening agent system and coordinate mutually (в
в р e ж и м e с о г л а с о в а н н о м с
р e а г e н т а .), start from the moment that spray gun does not have slag input, end to add behind the sweetening agent 20～120 seconds, be preferably 20～60 seconds.The time point (starting point) that the present invention begins to add electric current and begin feed does not preferably overlap, and adding electric current will be earlier.The time point that feed finishes stops supplying Zao 20～120 seconds of time point than electric current.
Voltage of the present invention can be in the scope of pointing out (20～60V) change, adapt with the feed system simultaneously, and the reinforced system of sweetening agent be in principle can change (such as, feeding quantity strengthens gradually, then reduces again).
The characteristics of this method also are, adding the end stage of electric current, add the electric current time span 5～20% the time change the polarity of electric current, and in bag, add the material that the Sulfur capacity that can increase slag can improve the slag electric conductivity simultaneously in the second half of blowing, such as lime-carbon element ore deposit ball.
The difference of this method equipment is, the metal construction in the conduction pipeline in spray gun and the rifle and the hardware of equipment and workshop is carried out electrical isolation, and what apply that electric current and migration current afterwards adopt to molten iron is electrode special, the stick electrode of namely using the high material of electric conductivity (such as graphite, iron-carbon) to make.The difference of equipment also is, replenishes to equipment and has installed in order to the proofing unit of recording process electrical parameter and the device of adjustment electrode position, has also equipped steady resistance and has been used for short-circuit alarming.
Equipment described in the invention and the essence of this method are all to scheme (seeing Fig. 2) explanation.Present device comprises a power device 1, it is connected with the metal tube 3 that passes the rifle body with the reinforced spray gun 2 of electrical isolation by a utmost point, metal tube 3 is introduced in the molten iron (melt) 5 that is in the hot metal ladle 4, and introducing the degree of depth is the position at spray gun outlet place.Another utmost point of power device 1 connects a conductive electrode 6, and the lower end of electrode is put in slag blanket or the metal level 7.Equipment also comprises a monitoring and detection element 8 (electrical parameter that is used for monitor procedure), a device of regulating electrode position can carry out the steady resistance 9 of short-circuit alarming with some, tie cable 10, test tank 11 is directly inputted auxiliary sweetening agent filling tank body 12 in the hot metal ladle replenishing auxiliary sweetening agent.The corresponding fs electrode of I-inserts the position in the slag blanket; The corresponding subordinate phase electrode of II-inserts the position in the molten metal.
The mode of operation of present device is as follows: the hot metal ladle that molten iron is housed is placed into to be processed after the position, and spray gun 2 is inserted the carrier gas that molten iron is confessed the band material simultaneously.Boundary is making current in an instant on spray gun contact melt, then supplies electric current system and sweetening agent feed system harmonious.Along with the movement of spray gun, electrode is also mobile simultaneously together afterwards, slips into 5～15% the degree of depth of molten iron height.Next, utilize a shift assembly to change the position of electrode according to the reading of measuring instrument, it is mentioned 0.4～0.6 height of thickness of slag layer.After the sweetening agent spray is complete, carry rifle, at this moment electric current supply also will continue 20～120 seconds, is preferably 20～60 seconds.
This method according to our proposition, the end stage of supplying with electric current power-on time length 5～20% the time change once or twice the polarity of electric current on the winding-up rifle, then add the adjustment material of 5～10kg/t iron in the slag in the second half of blowing, increase on the one hand the Sulfur capacity of slag, improve on the other hand the electric conductivity of slag phase.
Implementing the distinguished characteristics of equipment that the suggestion of this method adopts is that the conduction spray gun that slips into melt metal part is arranged, and it is connected to of power supply and extremely go up and electric current is guided to spray gun exports the region.Another utmost point of power supply is received on the electrode made from high conducting material.
For getting rid of the work safety of energy loss and assurance plant personnel and equipment, electrical isolation is carried out in spray gun and conducting wire, and power supply system is then introduced steady resistance in forming.
The working condition of equipment is as follows:
After the hot metal ladle of filling molten iron was in place, spray gun namely was inserted into down the working position of molten iron depths.In spray gun and moment before bath surface contacts, connect in advance the carrier gas supply.And then the moment making current of end in contact bath surface under the spray gun is spent 10～60 seconds and is arrived at working position moment at lance head and begin to add sweetening agent by the system that adopts.In fact the above-mentioned time period depends on that lance head moves to the working position from bath surface and begins the used time span of feed.This time span can change with the factors such as the speed difference of hot metal ladle volume (highly), topworks.When adding desulfurization, the system that applies electric current should be coordinated mutually with the system that adds sweetening agent.In the second half of operation, on slag, add the batching (such as lime-carbon granule or agglomerate) that can improve slag Sulfur capacity and specific conductivity, addition is 5～10kg/t iron.
The reason of lower limit addition is obvious efficient to have occurred, and upper limit addition then depends on the thermodynamic condition of melt, and the melt undercooling can make slag change non-homogeneous state into by uniform state, and the non-homogeneous state of slag makes the deterioration of efficiency of refining process.
Sometime the progress of process (observe determine) of operation the second half carry out once or twice conversion spray gun on current polarity, judge the state that makes slag reach necessity according to viscosity and mobile reading, guarantee under this state that the metal in the dreg grain is minimum, and therefore the output capacity of qualified metal descends also minimumly.Finish behind the feed to stop to apply in 20～120 seconds electric current.
Desulfurizing iron operating time table
Adopt the 500kg hot metal ladle under laboratory condition, to carry out series of experiments, proved reasonableness and the validity of this technical scheme that proposes.Apply the equipment that potential energy adopts, primary member is the device assembly that applies electromotive force in carrier gas jet for the device assembly of sweetening agent with in the melt.The latter is used for obtaining the direct current of opposed polarity, and power device voltage is preferably 5～50V.In addition with the feed bin of rotor material feeder, rotor material feeder end was an air chamber, is connected with spray gun during equipment formed.Add that to send sweetening agent be that this pipe is put in the rifle body by a metal tube when manufacturing spray gun.Also equipped detecting instrument instrument (weighing tool, weather gage, under meter) in order to record electric action characteristic.
Pour 300～350 kilograms of the molten iron that in another stove, prepare in 800～1000 ℃ the bag into to being preheating to.The molten iron chemistry is composed as follows, %:C-3.6～3.9; S-0.017～0.062; Si-0.75～0.94; P-0.056～0.070.
Molten iron was blowing 3～4 minutes with sweetening agent under the condition that applies electromotive force to molten iron behind the thermometric.After the end of job, chemical analysis and spectroscopic analysis are carried out in the sampling of molten iron thermometric.
Acquired results proves, mainly processes index significantly better than the processing heat that does not apply electro ultrafiltration when one of them current polarity scheme of employing.Such as, hot metal temperature drop reduces to 126 ℃ (rather than 163 ℃ between operational period.Cooling rate is than original low about 20%), desulfurization degree is brought up to 5.59%/kilogram/t iron (desulfurization rate improves about 70%) from 3.8%.
Ensuing test initial sulphur content from molten iron is all very large to sweetening agent consumption variation range.But all confirmed can make desulfurization degree improve 40～80% when adding electromotive force processing molten iron, temperature drop reduces to 16～22 ℃ from 42～53 ℃.
Be with being appreciated that, more than about specific descriptions of the present invention, only for the present invention being described and being not to be subject to the described technical scheme of the embodiment of the invention, those of ordinary skill in the art is to be understood that, still can make amendment or be equal to replacement the present invention, to reach identical technique effect; Use needs as long as satisfy, all within protection scope of the present invention.
Claims (9)
1. molten iron method of refining in the bag, by the spray gun (2) that metal tube (3) are arranged in the refractory lining is arranged outward, adopt the inert gas jets mode that Powdered sweetening agent is blown in the hot metal ladle (4) and carry out desulfurization, it is characterized in that sweetening process is carried out applying in the low pressure electromotive force situation in melt (5); The approach of setting up the low pressure electromotive force is to apply electric current by spray gun (2) to the molten iron space of spray gun outlet position from the utmost point of power device (1), and another utmost point of described power device (1) then provides electric current by the conductive electrode (6) that slips in the molten iron; Slip into described conductive electrode (6) in the molten iron first and in 5～15% degree of depth of molten iron height, after finishing the first half term of blowing, move into conductive electrode (6) in the slag blanket (7) and be in 0.4～0.6 degree of depth of slag blanket height, in the upper magnitude of voltage 10～60V situation of power device (1), apply electric current.
2. molten iron method of refining in the bag according to claim 1 is characterized in that: add the electric current system and coordinate mutually with adding the sweetening agent system, start from spray gun (2) and slip into melt (5) and go up moment of boundary and after the finally sweetening agent spray 20～120 seconds.
3. molten iron method of refining in the bag according to claim 2 is characterized in that: applying the end stage of electric current, the polarity of switching current on its time span of 5～20%.
4. molten iron method of refining in the bag according to claim 3 is characterized in that: in the second half of blowing, can improve the material of Sulfur capacity and specific conductivity to the middle interpolation of hot metal ladle slag blanket (7).
5. molten iron method of refining in the bag according to claim 4, it is characterized in that: the described material that improves Sulfur capacity and specific conductivity is lime-carbon granule or agglomerate.
6. molten iron method of refining required equipment in the bag as claimed in claim 5, comprise that hot metal ladle (4), test tank (11) reach the spray gun (2) with metal tube (3), it is characterized in that, also comprise: power device (1) and conductive electrode (6); Metal tube (3) in one utmost point of described power device (1) and the spray gun (2) joins, and the port of its another utmost point and conductive electrode (6) joins; Described spray gun (2) and conductive electrode (6) are inserted in the hot metal ladle (4).
7. molten iron method of refining required equipment in the bag according to claim 6 is characterized in that: also be provided with signal conditioning circuit; The port of described power device (1) connects the power delivery port of signal conditioning circuit; Metal tube (3) in the described spray gun (2) and the port of conductive electrode (6) join with the signal transmission port of signal conditioning circuit respectively.
8. molten iron method of refining required equipment in the bag according to claim 7 is characterized in that: fixedly be furnished with auxiliary sweetening agent filling tank body (12) on the top of described hot metal ladle (4).
9. molten iron method of refining required equipment in the bag according to claim 8, it is characterized in that: described conductive electrode (6) is the high conductivity stick electrode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110122211 CN102212638B (en) | 2011-05-12 | 2011-05-12 | Refining method of molten iron in ladle and devices required by same |
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|---|---|---|---|
| CN 201110122211 CN102212638B (en) | 2011-05-12 | 2011-05-12 | Refining method of molten iron in ladle and devices required by same |
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| CN102212638A CN102212638A (en) | 2011-10-12 |
| CN102212638B true CN102212638B (en) | 2013-03-20 |
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| CN102978341A (en) * | 2012-12-24 | 2013-03-20 | 营口戴斯玛克科技发展有限公司 | Desulfuration spray gun for molten iron refining |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2371196Y (en) * | 1999-05-27 | 2000-03-29 | 刘东业 | Equipment for desulfurating of molten iron by single blasting gasified granular magnesium |
| CN1461812A (en) * | 2002-05-31 | 2003-12-17 | 李江 | Method and device for pretreating metal iron using torpedo hot metal mixer car diversified composite jetting method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000192116A (en) * | 1998-12-22 | 2000-07-11 | Nippon Steel Corp | Method for desulfurizing/desiliconizing molten iron in blast furnace and device therefor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2371196Y (en) * | 1999-05-27 | 2000-03-29 | 刘东业 | Equipment for desulfurating of molten iron by single blasting gasified granular magnesium |
| CN1461812A (en) * | 2002-05-31 | 2003-12-17 | 李江 | Method and device for pretreating metal iron using torpedo hot metal mixer car diversified composite jetting method |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2000-192116A 2000.07.11 |
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