CN105296709A - Surging molten iron slag-off method - Google Patents
Surging molten iron slag-off method Download PDFInfo
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- CN105296709A CN105296709A CN201410253742.5A CN201410253742A CN105296709A CN 105296709 A CN105296709 A CN 105296709A CN 201410253742 A CN201410253742 A CN 201410253742A CN 105296709 A CN105296709 A CN 105296709A
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- molten iron
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention provides a surging molten iron slag-off method. Two air injection guns are perpendicularly inserted into molten iron from the top of a molten iron tank. The interval between the two guns is 1/2 of the radius of a tank opening, the insertion positions are located at the points 1/2 of the radius of the tank opening, and the insertion depth ranges from 0.5 m to 2.5 m; the air supply intensity is controlled to be larger than or equal to 2 NL/(min t) and the pressure is larger than 0.7 MPa; the air supply intensity of the air injection gun A is controlled to be 2 NL/(min t), the air supply intensity of the air injection gun B is gradually increased till the molten iron boiling exposed face makes contact with the wall of the molten iron tank, the air supply intensity of the air injection gun A is adjusted to be the same as that of the air injection gun B till the area of the molten iron boiling exposed face is larger than 1/2 of the tank opening of the molten iron tank, and therefore slag-off operation is started; after slag-off operation is finished, the air injection guns are pulled out of the molten iron and inject air continuously for over 30 s; and hoist cranes are used for lifting the air injection guns, so that locating pins are away from locating holes from 190 mm to 210 mm, the hoist cranes are transversely moved till the interval between the two guns reaches the length of the radius of the tank opening and then the hoist cranes fall, and the locating pins fall into new locating holes. By the adoption of the surging molten iron slag-off method, slag-off time can be shortened and iron loss and the converter resulfurization amount generated in the desulfuration slag-off process can be effectively reduced.
Description
Technical field
The invention belongs to iron ladle slag skimming process field, in particular to not using poly-slag agent after a kind of desulfurizing iron, desiliconization, dephosphorization, but utilize blowing gas from jet gun to form gush phenomenon, push molten iron tank deck slag to skimming gate, and then be easy to skim and reduce the method for molten iron loss.
Background technology
After desulfurizing iron, dephosphorization, desiliconization, for preventing the problem such as subsequent handling " time sulphur ", " rephosphorization ", the consumption of increase metallurgy lime from occurring, must the top slag after dephosphorization, desiliconization and desophorization for hot metal be removed.For top slag is removed smoothly, current Normal practice drops into poly-slag agent, the top slag of good fluidity is become thickness, recycling mechanical manipulator is concentrated and is removed, sometimes because indivedual steel grade is to the strict demand of sulphur content, especially for the pure magnesium powder sulfur removal technology of winding-up, the rare amount of slag is little, often needs repeatedly to drop into poly-slag agent.Like this, not only increase poly-slag agent and consume, and molten iron can be increased take off damage.Therefore, how fast, at low cost to remove top slag, especially do not use poly-slag agent, for reduction steel technology, there is huge realistic meaning and economic worth.
Patent CN03211240.8 provides a kind of hot-metal bottle side blow slag gathering device, its structure is centre is porous core, porous core skin is refractory masses, add iron sheet in the outside of refractory masses to fix, ventpipe is equipped with in the bottom of slag gathering device, ventpipe is equipped with Quick connection part, slag gathering device is fixed on the sidewall of iron ladle by flange, by side-blown slag gathering device, rare gas element is blown in molten iron, by means of the buoyancy that gas produces in molten iron, after slag on iron ladle liquid level is assembled, make iron-holder in its slag reduce again by skimming, thus reach reduction iron loss, reduce the object consumed.But the porous core restricted lifetime that the method adopts, increases tank lining cutting and build difficulty, and side-blown positional distance skimming gate is comparatively far away, is difficult to form effective gathering to residue.
Molten iron pot narrow gap gas-blowing slag-removing device and operating procedure disclosed in application number 200710015162.2, this molten iron pot narrow gap gas-blowing slag-removing device has a mechanical arm be made up of the first hydro-cylinder and the second hydro-cylinder, the first horn and the second horn and turning joint, mechanical arm is provided with blowpipe, blowpipe is provided with gas connection pipe and nozzle, nozzle is narrow slit shape nozzle, and its operating procedure is: first gas connection pipe has been communicated with nitrogen tube or air compressor by A.; B. by iron ladle after position inclination certain angle of skimming, adjusted the top of the slag distance of narrow slit shape nozzle and iron ladle by amplitude-variable mechanical arm, then by narrow slit shape nozzle to top of the slag nitrogen-blow or pressurized air, liquid slag is driven to outside iron ladle mouth.Same being difficult to of narrow slit air blowing that the method adopts ensures work-ing life, increases tank lining cutting and builds difficulty, and due to some air blowing, top slag can only be blown out " crescent moon ", and top, bent moon two ends slag removes and still acquires a certain degree of difficulty.
The blowing slag-removing equipment for molten iron pretreatment that application number 201010272903.7 provides, be arranged on iron ladle slag removal machine platform, it comprises guide rail, pivoting support, adjustable seats, guide roller, jockey sprocket, lifting drive, lift cart, inflatable bar and refractory segment.Guide rail is inclined at above iron ladle, and lift cart is arranged on guide rail, and lifting drive is moved up and down along guide rail by jockey sprocket transmission lift cart.Pivoting support connection guide rail top, in the middle part of adjustable seats connection guide rail, guide roller is arranged on guide rail bottom, and pivoting support and adjustable seats are all fixed on slag removal machine platform.Inflatable bar is arranged on lift cart, and refractory segment is connected to inflatable bar bottom.When slag removal machine works, inflatable bar is inserted nitrogen blowing in hot metal ladle.Along with the carrying out of the process of skimming, the quantity of slag constantly reduces, and molten iron exposed surface constantly expands, until slag almost removes completely.But the jet gun due to the method is tilting inserts molten iron, although there is the effect of guide rail and bearing, unavoidably certain amount of deflection will be produced under natural gravity effect, and refractory materials only possesses heat insulating ability, jet gun upper epidermis refractory materials very easily produces tiny crack under a stretching force, can accelerate molten iron erosive velocity, the work-ing life of jet gun insertion portion can shorten greatly.
Application number 200520039594.3 discloses a kind of device for removing slag, comprises job platform, telescoping mechanism, blows slag rifle, rotating mechanism, hoisting appliance; Job platform, which is provided with track; Telescoping mechanism, comprises billy gate, driving mechanism; Billy gate is arranged on the track of job platform, and is connected with driving mechanism; Blow slag rifle, be arranged on billy gate; Make to blow slag rifle by telescoping mechanism accurately to put in place; Rotating mechanism comprises electric motor, and its one end is connected to billy gate, connects telescoping mechanism and blows slag rifle, and adjustment is blown slag rifle gas and is blown into angle; Hoisting appliance comprises turret mount, driving mechanism; Described turret mount one end is movably connected on job platform, and its one end is connected to driving mechanism, and described track is arranged on this turret mount.Blown by spray gun before skimming, the iron ladle lip region that the scum silica frost of hot metal ladle Background Region is driven, then remove mechanically.The jet mode of the method is also that tilting inserts, and molten iron is difficult under continuing baking effect ensure jet gun permanency shape below.And this spray gun is with can not doing left and right in the horizontal direction mobile, be difficult to residue to be brought together.
A kind of top blast utility appliance of metallurgical external slag-removing treatment technology disclosed in application number 200620007154.4, be made up of source of the gas, pipeline, air jet system, source of the gas is connected with air jet system by pipeline, and air jet system is the top spray gun on metallurgical tank top or outside portion erection.Top spray gun is that 1-3 props up, top spray gun or be rotary or for parallel-moving type; Source of the gas or be reductibility or for neutral or be rare gas element.When gas is blown in molten iron, the gas undergoes rapid expansion heated driving on molten iron gushes, and causes molten iron face exposed.The jet gun of the method is also that tilting inserts molten iron, unavoidably will produce certain amount of deflection, cause jet gun upper epidermis refractory materials to produce tiny crack under a stretching force, accelerate molten iron and corrode, shorten the jet gun life-span.And this spray gun can not move left and right in the horizontal direction in the process of skimming, skimming latter stage like this, namely level of residue not Football Association's quantity of slag 1/5 time, only relying on and strengthening air supply intensity is be difficult to residue to be brought together, and air supply intensity exceed certain value after can cause again the danger of molten iron splash.
Summary of the invention
The invention provides one and spring up formula molten iron drossing method, after desulfurizing iron, desiliconization, dephosphorization, do not use poly-slag agent, but utilize insert spray gun blowing gas to drive molten iron to spring up from bottom to top, top slag is pushed to the novel method that skimming gate is easy to skim, its object is intended to shorten slag-removing time, reduces residue and iron loss.
For this reason, the solution that the present invention takes is:
One springs up formula molten iron drossing method, it is characterized in that, concrete operation step is:
1, jet gun inserts: A, B two jet guns insert molten iron from iron ladle plan vertical simultaneously, two jet gun spacing control in about 1/2 of iron ladle port radius length, vertical on position is tank mouth 1/2 radius when iron ladle is steady, depth of penetration 0.5-2.5m, and the line of two jet guns is vertical with traffic direction of skimming.
2, jet operation: the muzzle of A, B two jet guns inserts molten iron front beginning air feed, controls air supply intensity >=2NL/ (mint), pressure > 0.7MPa; Control A jet gun air supply intensity is at 2NL/ (mint), and B jet gun progressively strengthens air supply intensity, after exposed surface contacts with molten iron tank skin until molten iron rolls, then strengthens A jet gun air supply intensity until identical with B jet gun air supply intensity; Then progressively strengthen A, B two jet gun air supply intensities, until molten iron rolling bare area is greater than iron ladle mouth 1/2, stability contorting air supply intensity, at 4-6NL/ (mint), starts to skim; At the end of skimming, continue winding-up more than 30s after jet gun extracts molten iron and close down gas again.
3, to skim cooperation: along with the carrying out of skimming, the residue quantity of slag is fewer and feweri, and it is more and more far away that gas springs up a distance residue slag, at the end of skimming, strengthens A, B two jet gun spacing, make spacing increase to tank port radius length; Concrete operations are: utilize cucurbit to hang lifting jet gun, steady brace is made to leave pilot hole 190-210mm on service platform, cucurbit hangs along crossbeam slowly movement, in case jet gun large-amplitude sloshing, until decline again when two jet gun spacing reach iron ladle tank port radius length, make steady brace fall into new pilot hole, the move distance of skimming controlling slag removal machine is less than iron ladle tank port radius length, and only does the linear reciprocating motion of horizontal direction.
Beneficial effect of the present invention is:
1, the present invention inserts jet gun from iron ladle plan vertical, thus avoids, due to the amount of deflection problem of the long generation under natural gravity effect of rifle body, making physical construction simpler.
2, the present invention insert jet gun in working order time can carry out moving left and right of horizontal direction, more be conducive to poly-slag, make to skim more thorough, especially when residue, advantage is more obvious, not only effectively can shorten slag-removing time, and sulfur content is returned in converter when greatly alleviating iron loss and desulphurization and slag skimming.
Accompanying drawing explanation
Fig. 1 springs up formula molten iron drossing structural scheme of mechanism.
In figure: crossbeam 1, cucurbit hang 2, air supply hose 3, steady brace 4, pilot hole 5, service platform 6, A jet gun 71, B jet gun 72, iron ladle 8.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment 1:
Molten iron top quantity of slag 3kg/t, iron ladle 8 headroom and tank mouth diameter than 0.13, molten iron temperature 1400 DEG C.
Iron ladle 8 tilts 23 °.Start cucurbit to hang 2 and start to fall A jet gun 71 and B jet gun 72, make steady brace 4 accurately fall into pilot hole 5 on service platform 6, the steam supply valve of air supply hose 3 opened by lower rifle simultaneously, controls air supply intensity 3NL/ (mint), pressure 0.75MPa.
Insert molten iron by simultaneously vertical from iron ladle 8 top to A jet gun 71 and B jet gun 72, A jet gun 71 and B jet gun 72 spacing are tank port radius length 1/2, and depth of penetration is 1/2 of the molten iron degree of depth.A jet gun 71 air supply intensity is constant, and progressively strengthen B jet gun 72 air supply intensity to 5NL/ (mint), now molten iron rolling, liquid level is exposed.Again A jet gun 71 air supply intensity is adjusted to 5NL/ (mint), stability contorting air supply intensity for some time, now molten iron bare area is visual has been greater than 1/2 of tank mouth, starts to skim.
When the not enough former quantity of slag 1/3 of level of residue, cucurbit hangs 2 lifting A jet gun 71 and B jet guns 72, steady brace 4 is made to leave pilot hole 5 about 200mm on service platform 6,2 are hung along the slow mobile cucurbit of crossbeam 1, A jet gun 71 and B jet gun 72 spacing are adjusted to iron ladle 8 tank port radius length, decline cucurbit hangs 2, makes steady brace 4 fall into new pilot hole 5.Continue to skim until terminate, carry rifle, and continue air feed 1min.
Embodiment 2:
Molten iron top quantity of slag 5kg/t, iron ladle 8 headroom and tank mouth diameter than 0.16, molten iron temperature 1350 DEG C.
Iron ladle 8 tilts 24 °.Start cucurbit to hang 2 and start to fall A jet gun 71 and B jet gun 72, make steady brace 4 accurately fall into pilot hole 5 on service platform 6, the steam supply valve of air supply hose 3 opened by lower rifle simultaneously, controls air supply intensity 2NL/ (mint), pressure 0.70MPa.
Insert molten iron by simultaneously vertical from iron ladle 8 top to A jet gun 71 and B jet gun 72, A jet gun 71 and B jet gun 72 spacing are tank port radius length 1/2, and depth of penetration is 2/3 of the molten iron degree of depth.A jet gun 71 air supply intensity is constant, and progressively strengthen B jet gun 72 air supply intensity to 6NL/ (mint), now molten iron rolling, liquid level is exposed.Again A jet gun 71 air supply intensity is adjusted to 6NL/ (mint), stability contorting air supply intensity for some time, now molten iron bare area is visual has been greater than 1/2 of tank mouth, starts to skim.
When the not enough former quantity of slag 1/3 of level of residue, cucurbit hangs 2 lifting A jet gun 71 and B jet guns 72, steady brace 4 is made to leave pilot hole 5 about 200mm on service platform 6,2 are hung along the slow mobile cucurbit of crossbeam 1, A jet gun 71 and B jet gun 72 spacing are adjusted to iron ladle 8 tank port radius length, decline cucurbit hangs 2, makes steady brace 4 fall into new pilot hole 5.Iron ladle 8 tilts 1-3 ° again, continues to skim until terminate, carries rifle, and continue air feed 2min.
Embodiment 3:
Molten iron top quantity of slag 10kg/t, iron ladle 8 headroom and tank mouth diameter than 0.2, molten iron temperature 1300 DEG C.
Iron ladle 8 tilts 25 °.Start cucurbit to hang 2 and start to fall A jet gun 71 and B jet gun 72, make steady brace 4 accurately fall into pilot hole 5 on service platform 6, the steam supply valve of air supply hose 3 opened by lower rifle simultaneously, controls air supply intensity 2NL/ (mint), pressure 0.70MPa.
Insert molten iron by simultaneously vertical from iron ladle 8 top to A jet gun 71 and B jet gun 72, A jet gun 71 and B jet gun 72 spacing are tank port radius length 1/2, and depth of penetration is 3/4 of the molten iron degree of depth.A jet gun 71 air supply intensity is constant, and progressively strengthen B jet gun 72 air supply intensity to 6NL/ (mint), now molten iron rolling, liquid level is exposed.Again A jet gun 71 air supply intensity is adjusted to 6NL/ (mint), stability contorting air supply intensity for some time, now molten iron bare area is visual has been greater than 1/2 of tank mouth, starts to skim.
When the not enough former quantity of slag 1/3 of level of residue, cucurbit hangs 2 lifting A jet gun 71 and B jet guns 72, steady brace 4 is made to leave pilot hole 5 about 200mm on service platform 6,2 are hung along the slow mobile cucurbit of crossbeam 1, A jet gun 71 and B jet gun 72 spacing are adjusted to iron ladle 8 tank port radius length, decline cucurbit hangs 2, makes steady brace 4 fall into new pilot hole 5.Iron ladle 8 tilts 1-3 ° again, continues to skim until terminate, carries rifle, and continue air feed 3min.
The iron loss of embodiment 1,2,3 is respectively 0.75t/ tank, 0.67t/ tank, 0.96t/ tank.
Claims (1)
1. spring up a formula molten iron drossing method, it is characterized in that, concrete operation step is:
(1) jet gun inserts: A, B two jet guns insert molten iron from iron ladle plan vertical simultaneously, two jet gun spacing control in about 1/2 of iron ladle port radius length, vertical on position is tank mouth 1/2 radius when iron ladle is steady, depth of penetration 0.5-2.5m, and the line of two jet guns is vertical with traffic direction of skimming;
(2) jet operation: the muzzle of A, B two jet guns inserts molten iron front beginning air feed, controls air supply intensity >=2NL/ (mint), pressure > 0.7MPa; Control A jet gun air supply intensity is at 2NL/ (mint), and B jet gun progressively strengthens air supply intensity, after exposed surface contacts with molten iron tank skin until molten iron rolls, then strengthens A jet gun air supply intensity until identical with B jet gun air supply intensity; Then progressively strengthen A, B two jet gun air supply intensities, until molten iron rolling bare area is greater than iron ladle mouth 1/2, stability contorting air supply intensity, at 4-6NL/ (mint), starts to skim; At the end of skimming, continue winding-up more than 30s after jet gun extracts molten iron and close down gas again;
(3) to skim cooperation: along with the carrying out of skimming, the residue quantity of slag is fewer and feweri, and it is more and more far away that gas springs up a distance residue slag, at the end of skimming, strengthens A, B two jet gun spacing, make spacing increase to tank port radius length; Concrete operations are: utilize cucurbit to hang lifting jet gun, the steady brace on jet gun is made to leave pilot hole 190-210mm on service platform, cucurbit hangs along crossbeam slowly movement, in case jet gun large-amplitude sloshing, until decline again when two jet gun spacing reach iron ladle tank port radius length, make steady brace fall into new pilot hole, the move distance of skimming controlling slag removal machine is less than iron ladle tank port radius length, and only does the linear reciprocating motion of horizontal direction.
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| CN201410253742.5A CN105296709B (en) | 2014-06-09 | 2014-06-09 | One kind springs up formula molten iron drossing method |
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| CN201410253742.5A CN105296709B (en) | 2014-06-09 | 2014-06-09 | One kind springs up formula molten iron drossing method |
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| CN105296709B CN105296709B (en) | 2017-07-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108193021A (en) * | 2018-03-07 | 2018-06-22 | 上海梅山工业民用工程设计研究院有限公司 | A kind of rush-harvesting and rush-planting device for steel mill continuous desulfurization blowing desulfurization agent |
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| CN101928801A (en) * | 2010-09-02 | 2010-12-29 | 宝钢工程技术集团有限公司 | Blowing slag-removing equipment for molten iron pretreatment |
| CN103114177A (en) * | 2013-03-12 | 2013-05-22 | 武汉钢铁(集团)公司 | Gas-blowing and slag-gathering spray gun for assisting slag-off of molten iron and using method of spray gun |
| CN203200299U (en) * | 2013-03-15 | 2013-09-18 | 上海梅山钢铁股份有限公司 | Air blowing gun used for blowing air and removing dregs |
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2014
- 2014-06-09 CN CN201410253742.5A patent/CN105296709B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2797380Y (en) * | 2005-02-06 | 2006-07-19 | 宝山钢铁股份有限公司 | Device for scooping up slag |
| CN2841671Y (en) * | 2005-04-11 | 2006-11-29 | 武汉钢铁股份有限公司第一炼钢厂 | A kind of metallurgical furnace top blast utility appliance that treatment technology is used that removes the gred outward |
| CN101100702A (en) * | 2007-07-30 | 2008-01-09 | 莱芜钢铁集团有限公司 | Molten iron pot narrow gap gas-blowing slag-removing device and operation technique thereof |
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| CN103114177A (en) * | 2013-03-12 | 2013-05-22 | 武汉钢铁(集团)公司 | Gas-blowing and slag-gathering spray gun for assisting slag-off of molten iron and using method of spray gun |
| CN203200299U (en) * | 2013-03-15 | 2013-09-18 | 上海梅山钢铁股份有限公司 | Air blowing gun used for blowing air and removing dregs |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108193021A (en) * | 2018-03-07 | 2018-06-22 | 上海梅山工业民用工程设计研究院有限公司 | A kind of rush-harvesting and rush-planting device for steel mill continuous desulfurization blowing desulfurization agent |
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| CN105296709B (en) | 2017-07-21 |
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