CN1590564A - Molten iron pretreatment method - Google Patents
Molten iron pretreatment method Download PDFInfo
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- CN1590564A CN1590564A CN 03150583 CN03150583A CN1590564A CN 1590564 A CN1590564 A CN 1590564A CN 03150583 CN03150583 CN 03150583 CN 03150583 A CN03150583 A CN 03150583A CN 1590564 A CN1590564 A CN 1590564A
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- molten iron
- slag
- hot metal
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- metal pretreatment
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Abstract
A process for pretreating the molten iron includes collecting molten iron from more than one blast furnace, and continuous desulfurizing, desiliconizing and dephosphorizing. It features that the different treating agents are added to the rotary stream of molten iron, which is generated by the molten iron flowing down, and several slag separators and rotary mixers are arranged at different height levels.
Description
Technical field
The present invention is the pretreatment process of desulfurization, desiliconization and/or the dephosphorization etc. of the relevant molten iron of producing in blast furnace.It provides can not change blast furnace operating, do not cause fault, carries out hot metal pretreatment continuously, and the hot metal pretreatment method of the very stable molten iron of composition can be provided to steel making working procedure.
Background technology
Hot metal pretreatment technology, (3 77 pages of 71 3 phases of volume of " iron and steel " magazine, 1985 years) that normally dephosphorization, desulfurization are handled respectively in desiliconization in desiliconization in molten iron tank, the metal mixer car, dephosphorization, desulfurization, the hot metal ladle.
Desiliconization in molten iron tank is handled, and has the molten iron that flows in pair groove to add desiliconization agent usually, and the method that desiliconization agent is added in the outlet of the employed groove that fascinates when molten iron is poured into metal mixer car and bull ladle from groove.For example, in Japanese publication 2001-40410, the energy that falls of molten iron makes it to produce rotating fluid when utilizing molten iron to flow out, and adds the efficient desilication method of desiliconization agent in rotating fluid.
The processing of carrying out in metal mixer car has the method for adding treatment agent molten iron when the groove that fascinates is poured metal mixer car into, and the method for treatment agent being injected the molten iron in the metal mixer car with spray gun.
Processing in hot metal ladle, known useful spray gun is the method for treatment agent injection and add treatment agent impeller stirring method in bag.
Also method that get up to handle continuously of the desiliconization of handlebar molten iron, dephosphorization, desulfurization.For example, in Japanese kokai publication sho 60-162711, proposed to vacate and be provided with at interval four and go up weirs and lead to the blast furnace casting groove,, respectively treatment agent has been injected from spray gun, desiliconization, dephosphorization, the processed continuously method of desulfurization at three reaction zones of last weir formation.
Also have, Japanese kokai publication hei 5-171220 has then proposed: be concatenated to form katabatic drainage and upwelling, the method for injection treatment agent below upwelling.
But there are the following problems for above-mentioned prior art:
At first, though easy to the method for adding treatment agent in the mobile molten iron in groove, in order to carry out the processing in groove, all iron notchs of blast furnace all need the equipment of hot metal pretreatment in the iron work.In other words, if three blast furnaces, each blast furnace has four iron notchs, just needs 12 pre-processing devices, so, keep in repair also miscellaneous, also unfavorable on the expense.
Have, if handle continuously, effect is all right in groove again; And the processing in the intermittent tapping, efficient is not high, also owing to be subjected to the influence of the composition change of the molten iron that comes out from blast furnace strongly, is not easy to obtain sufficient pretreating effect, and the molten iron of stable components can not be provided to steel making working procedure, just becomes problem.This also is the uneven problem of hot metal composition that causes to come out from many blast furnaces.
In iron notch, can't carry out whole processing of desiliconization, dephosphorization, desulfurization at present, in metal mixer car, hot metal ladle, handle in addition.For this reason, the damage of the inner lining refractory of metal mixer car and hot metal ladle is very serious, also needs a large amount of running stores as the spray gun that injects the treatment agent use, adds to repair and uses material, causes auxiliary materials expense to improve constantly.Have again,, have personnel to guarantee, perfect system be arranged because various device needs to repair.
Utilize iron notch to carry out continuous pretreated method and open clear 60-162711 aforementioned spy, the problem of existence has: because the injecting gas violent stirring, make extensive melting loss at the bottom of the molten iron tank; To separate slag with molten iron and must guarantee to have sufficiently long reaction zone; Because reaction zone is a successive, just be not easy control when fault has taken place at a place.
Open in the method for flat 5-171239 aforementioned spy, the problem that exists is: because the utilization gas carrier injects powder from the bottom, acutely seethed with excitement in top, but in order to keep the plateau region of operate continuously necessity, make the apparatus for continous treatment container very big, reaction vessel is complex-shaped, refractory materials liner and maintenance management difficulty subsequently; Because reaction zone is a successive, just be not easy control when fault has taken place at a place.
Summary of the invention
For solving above-mentioned the deficiencies in the prior art, the objective of the invention is to propose a kind of very easy and hot metal pretreatment method that processing efficiency is outstanding, it can supply composition uniform molten iron to steel making working procedure; And, can reduce production costs effectively, obtain low cost and fine molten iron; In addition, when emergency situation such as having an accident, take emergency measures easily, safe.
For achieving the above object, technical solution of the present invention is: the molten iron from an above blast furnace casting is put together, carry out every processing of desulfurization, desiliconization, dephosphorization continuously; And, in every processing of desulfurization, desiliconization, dephosphorization, when utilizing molten iron to flow out molten iron fall energy, make to rotate stream, in this rotating fluid, add various treatment agents, make to flow in the container of accepting molten iron.
According to the present invention, owing to be to carry out pre-treatment, therefore be not subjected to from the hot metal composition of blast furnace and the moving influence of quantitative change of tapping a blast furnace concentrating on one from the molten iron of an above blast furnace casting, can be composition, hot metal supply next procedure that quantity is stable.Even when in the operation in several the blast furnaces fault having taken place, also can prevent from next procedure is brought influence.In the present invention, carry out hot metal pretreatment owing to concentrating at a place, the maintenance of relevant device, spot check, the several people just can carry out, and is also very favourable on the expense.
Also have, in the present invention, be provided with difference of altitude and dispose several slag parting furnaces, between these slag parting furnaces, be provided with rotary blender.That is to say that the reaction of treatment agent and molten iron is mainly carried out on rotary blender, and slag and molten iron separate and moving of molten iron mainly carried out on the slag parting furnace.Owing to have in rotary blender treatment agent and molten iron blended function, the slag parting furnace can focus on the slag separation function, thereby, the separation accuracy height of slag, and can shorten the length of slag parting furnace.
Because the slag parting furnace can provide the kinergety of past horizontal direction to molten iron, thereby makes molten iron when rotary blender falls, and can make it generation speed rotating fluid faster.And dispose several slag parting furnaces owing to be provided with difference of altitude, because the slag parting furnace is independent separately, thereby also control easily when breaking down, for example, in case of emergency, by changing the slag parting furnace interrupt operation time also if the short period of time just passable.Have, by the combination of last weir and slag outlet orifice, temperature descends little, and can accurately isolate slag and molten iron again.
Therefore,, used 4 slag parting furnaces and 3 rotary blenders,, can obtain high-quality molten iron with low expense based on top reason in order to carry out desulfurization, desiliconization, dephosphorization continuously.
Beneficial effect of the present invention:
According to the present invention, the different molten iron of the composition that comes out from some blast furnaces put together carry out pre-treatment.Like this, even the unsettled blast furnace of production is arranged, also can supply composition uniform molten iron to steel making working procedure.Therefore, just become very stablely in the refining of steel making working procedure, can do effective composition adjustment, can also expect that the refining expense reduces.And, because hot metal pretreatment equipment is concentrated, can carry out maintenance management efficiently, add that hot metal composition is stable, can be expected at the aspect that reduces cost and also have very big effect.
By slag parting furnace and rotary blender are combined, mainly be that the total length of slag parting furnace has shortened owing to can focus on the slag parting furnace on the slag separation function, temperature descends few, the separation of slag can be carried out with high precision, and the fast rotating fluid of flow velocity can be formed.Thereby the continuous hot metal pretreatment method compared with in the past can obtain low cost and fine molten iron.
Have again,, thereby when emergency situatioies such as accident have taken place, also take emergency measures easily because several slag parting furnace is separately independently, safe.
Description of drawings
Fig. 1 is the synoptic diagram of the embodiment of the invention.
Fig. 2 is the synoptic diagram of the funnel type example of rotary blender among the present invention.
Fig. 3 is for being provided with the synoptic diagram of the internal diameter outlet pipe also bigger than export department internal diameter in the rotary blender export department outside among the present invention.
Fig. 4 a is the skiagraph of slag parting furnace.
Fig. 4 b is a slag parting furnace front elevation.
Fig. 4 c is that A-A in Fig. 4 b is to view.
Fig. 5 a represents the skiagraph of the position relation of slag parting furnace and rotary blender.
Fig. 5 b represents the orthographic plan of the position relation of slag parting furnace and rotary blender.
Nomenclature among the figure
1: the rotary blender of funnel type
2: export department
3: molten iron
4: treatment agent
5: the internal diameter of rotary blender export department
6: the internal diameter of outlet pipe
7: outlet pipe
8: the molten iron liquid level
9: the liquid level diameter
10: level
11: steel casing
12: the slag relief outlet
13: go up the weir
16: refractory materials
17: slag
18: molten iron
19: the molten iron relief outlet
20: the iron water stream
21～24: the slag parting furnace
31～34: rotary blender
Embodiment
Fig. 1 is the synoptic diagram of expression example of the present invention, and in Fig. 1,4 slag parting furnaces 21～24 have been set difference of height and have been configured, and are provided with rotary blender 31～33 respectively between slag parting furnace and slag parting furnace.Molten iron alternately flows from top between the rotary blender of slag parting furnace and setting therebetween successively, forms a Continuous Flow.At first in Fig. 1 on first rotary blender 31, sweetening agent calcium oxide CaO powder is added on the molten iron.On second rotary blender 32 in the middle of being positioned at, add desiliconization agent ferric oxide Fe
2O
3Powder; Then on nethermost the 3rd rotary blender 33, add calcium oxide CaO powder, the ferric oxide Fe of dephosphorizing agent
2O
3Powder.At this moment, inject oxygen with spray gun, beneficial to improving on the reaction efficiency.In each bar iron notch, be provided with weir 13, the slag after the processing is discharged.Add the place of various treatment agents, be preferably in rotary blender or its upper reaches one side.Here said upper reaches one side at the slag parting furnace that injects rotary blender, then is the dirty part from last weir.
On treatment process, the method of adding treatment agent on the molten iron of slag parting furnace of flowing through also is fine, but for the reaction efficiency that makes treatment agent higher, more even,, using and utilizing the energy that falls of molten iron to make the container that rotates stream during from the slag parting furnace to slag parting furnace supply molten iron.Be exactly, make and rotate stream by the energy that falls that utilizes molten iron, the phenomenon of having utilized the molten iron of rotation to get involved in treatment agent naturally can easily improve the reaction efficiency of treatment agent.
For rotate the molten iron that stream stops in container, getting involved in to rotating fluid vortex core part buoyant treatment agent.Treatment agent has according to being inclined to rotating fluid centre portions progressive with the difference in specific gravity of molten iron.Because the chance of treatment agent contacting container wall is little, the damage that the inner surface of container that is made of refractory materials etc. is caused is also few.
The slag parting furnace is to have the molten iron of discharging from rotary blender is carried out separating of slag and molten iron, the refining furnace of the effusive function of molten iron of having got rid of slag.Shown in Fig. 4 a～4c, with refractory materials liner, an end the elongated stove of molten iron spout is arranged in that steel casing is inboard, be used to separate slag on 13 sides, the weir slag relief outlet 12 that has the outflow slag to use.Furnace bottom flows out direction towards molten iron and slowly tilts.Cardinal principle identical construction in weir on skim weir or the tundish that last weir 13 can be used and be used in iron notch usually.Slag relief outlet 12 is the outlets of the slag that floats being discharged usefulness, connects ash shoot etc. in this part, and the structure of for example similar tap cinder groove is also passable.
The slag parting furnace is in order to utilize potential energy to rotary blender molten iron without interruption, furnace bottom tilts, its angle of inclination is preferably in 5～20 degree, be lower than 5 degree, just do not have enough potential energies, the speed of rotating fluid is just low, can not get sufficient mixed effect, surpass 20 and spend then that slag is not easy come-up,, must guarantee that the capacity of slag parting furnace and length can guarantee that molten iron has the sufficient residence time in order to make separating of slag and molten iron abundant.For slag is separated with molten iron, guarantee has the sufficient residence time, and slag parting furnace furnace bottom angle of inclination is partly changed, and this can design according to treatment agent.
This can directly accept molten iron from blast furnace by the hot metal pretreatment device that several slag parting furnaces and rotary blender are formed, and also can be located at the place away from blast furnace.Be arranged on place away from blast furnace, with carrying molten iron such as hot metal ladle and metal mixer cars, equipment that can molten iron without interruption for example hot metal ladle rotation tower etc. be located on the slag parting furnace.Also have, be reduction equipment length, the configuration of slag parting furnace is linear arrangement not necessarily, also can be in the joint portion of each slag parting furnace, with arbitrarily angled change direction.
The shape of rotary blender does not limit specially, can use funnel type, basin type etc.If consider the generating ability of rotating fluid, funnel type is an ideal.Fig. 2 is the synoptic diagram of expression funnel type container instance.As shown in the figure, molten iron export department 2 is arranged, utilize the energy that falls of molten iron, can rotate stream in the bottom of the rotary blender 1 of funnel type.Also have, Fig. 3 is employed among Fig. 1, but has the rotary blender of outlet pipe 7 below the funnel type container.
The size of rotary blender should be according to the amount decision of the molten iron of handling.But for rotating fluid is taken place effectively, as shown in Figure 3, the ratio (liquid level diameter/export department's internal diameter) of the molten iron liquid level diameter 9 in container and export department's 7 internal diameters 6 should be more than 3 below 10, and the angle on scarp is preferably in 20～40 °.Here said scarp angle is meant coning inner surface of container and the angle that constitutes of central shaft.For example, diameter 500～2500mm to the degree of depth 100～4000mm of export department, can use the container of the internal diameter 30～300mm of export department.Ideal is that diameter 1000～2000mm is to the degree of depth 500～2500mm of export department, the internal diameter 150～250mm of export department.
Improve the mixing effect of rotary blender again, preferably installation outlet pipe 7 below rotary blender funnel type container as shown in Figure 3 owing in funnel type container outlet portion big whipping force can take place, has improved the stirring and mixing effect of treatment agent and molten iron.At this moment, the ratio (outlet pipe internal diameter/export department's internal diameter) of the internal diameter 5 of this funnel type outlet of container portion and outlet pipe 7 internal diameters 6 preferably is set in more than 1.2, and is better more than 1.4.Outlet pipe 7 length more than 300mm just can, 300～1000mm scope best.Its reason is, if discontented 300mm, the treatment agent in outlet pipe 7 and the mixed effect of molten iron are just not enough.When surpassing 1000mm, promote that the effect that stirs is just little, like this, the maintenance of outlet pipe 7 is repaired will become miscellaneous, and expense also can rise.Also have, the height for the gas booster compressor of trying one's best can do bending to the outlet pipe 7 of rotary blender halfway.In the time of this, can flatly carry out bending with interior at 5 times of diameter R.If surpass 5 times, outlet pipe 7 might be stopped up by slag.
In addition,, as shown in Figure 5, should stagger the iron water stream 20 of slag parting furnace 25 from the center 21 of rotary blender 34, rotary blender is set in order to make it generation speed rotating fluid faster.Moreover, because common abiogenous eddy current is the anticlockwise rotation on the Northern Hemisphere, be to rotate clockwise in the Southern Hemisphere, therefore should make and set this direction for.
[embodiment]
To the molten iron (1510 ℃ of temperature) that comes out from blast furnace, as shown in Figure 1, from the iron notch that fascinates to 4 slag parting furnaces 21～24 are set the metal mixer car, between slag parting furnace and slag parting furnace, rotary blender 31～34 is set.Blast-furnace slag is discharged from slag relief outlet 12 in weir 13 on passing through on first slag parting furnace 21, make it to rotate 10～20 kilograms of/ton sweetening agents of stream back interpolation from pour molten iron into the rotary blender 31 between second slag parting furnace 22, fall with making together at the 2nd slag parting furnace 22, carry out desulfurization and handle with 5 tons of/minute mobile molten iron.Employed rotary blender 31 is funnel types, the diameter 1000mm above the funnel.Above funnel to the dark 800mm of export department, the internal diameter 80mm of export department.The ratio of liquid level diameter 750mm and export department's internal diameter (liquid level diameter/export department's internal diameter) is 9.4, makes to rotate stream under the condition of level 580mm.
Similarly, between second slag parting furnace 22 and the 3rd slag parting furnace 23, be provided with rotary blender 32, above rotary blender 32, pour into molten iron make rotate stream after, add 10～20 kilograms/ton desiliconization agent, carry out desiliconization and handle.
Employed here rotary blender 31～34th, funnel type, size is with being arranged on the identical of second slag parting furnace upper reaches.But be provided with the outlet pipe 7 of internal diameter 110mm (ratio of outlet pipe 7 internal diameters/export department's internal diameter is 1.4), long 800mm in the bottom of this container outlet portion, to promote the desilication reaction in outlet pipe 7.
Above the 4th slag parting furnace 24, rotary blender 33 is set, pours the dephosphorizing agent that molten iron makes it to rotate 10～20 kilograms/ton of stream back interpolations into, inject oxygen to rotating fluid simultaneously from rotary blender 33.
The molten iron analysis that the 4th slag parting furnace 24 discharged, can ease down to the level that sulphur, silicon, phosphorus can both satisfy, the unit consumption of treatment agent also can be than original attenuating 50～80%.
Claims (12)
1. the hot metal pretreatment method is characterized in that, the molten iron from an above blast furnace casting is collected, and carries out every processing of desulfurization, desiliconization and/or dephosphorization continuously.
2. hot metal pretreatment method as claimed in claim 1, it is characterized in that, in the every processing of desulfurization, desiliconization and dephosphorization, molten iron falls energy when utilizing molten iron to flow out, make and rotate stream, add various treatment agents at the central of this rotating fluid or its upper reaches one side, make it to flow in the container of accepting molten iron.
3. hot metal pretreatment method as claimed in claim 1, it is characterized in that, molten iron is by a plurality of slag parting furnaces of setting height difference configuration, and the rotary blender that between these slag parting furnaces, is provided with, form a Continuous Flow, at rotary blender or its upper reaches one side interpolation treatment agent separately.
4. hot metal pretreatment method as claimed in claim 1 is characterized in that, uses four slag parting furnaces and three rotary blenders, carries out desulfurization, desiliconization and dephosphorization treatment continuously.
5. hot metal pretreatment method as claimed in claim 3, it is characterized in that described slag parting furnace is elongated vessel or chute, an end is the molten iron spout longitudinally, in last weir and side and the molten iron stream direction that meets at right angles the slag relief outlet is arranged, furnace bottom slowly tilts towards molten iron spout direction.
6. hot metal pretreatment method as claimed in claim 3 is characterized in that, the angle of inclination of described slag parting furnace furnace bottom is 5～20 degree.
7. hot metal pretreatment method as claimed in claim 3 is characterized in that, the molten iron liquid level diameter of described rotary blender and the ratio of export department's internal diameter are 3～10.
8. hot metal pretreatment method as claimed in claim 3 is characterized in that, the angle that the inner surface of container of described rotary blender and central shaft constitute is at 20～40 °.
9. as claim 3 or 7 or 8 described hot metal pretreatment methods, it is characterized in that, outlet pipe is installed below the described rotary blender.
10. hot metal pretreatment method as claimed in claim 9 is characterized in that, the ratio of the container outlet bore of described rotary blender and the internal diameter of export department (outlet pipe internal diameter/export department's internal diameter) more than 1.2, is preferably more than 1.4.
11. hot metal pretreatment method as claimed in claim 9 is characterized in that, the outlet of container pipe of described rotary blender is bending midway.
12. the described hot metal pretreatment method of claim 9 is characterized in that, more than the described outlet pipe length 300mm, is preferably 300～1000mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03150583 CN1273620C (en) | 2003-08-27 | 2003-08-27 | Molten iron pretreatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03150583 CN1273620C (en) | 2003-08-27 | 2003-08-27 | Molten iron pretreatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1590564A true CN1590564A (en) | 2005-03-09 |
| CN1273620C CN1273620C (en) | 2006-09-06 |
Family
ID=34597604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03150583 Expired - Fee Related CN1273620C (en) | 2003-08-27 | 2003-08-27 | Molten iron pretreatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1273620C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162019A (en) * | 2011-04-06 | 2011-08-24 | 河北钢铁股份有限公司承德分公司 | Multistage combined pretreatment method for vanadium-bearing molten iron |
| CN101306928B (en) * | 2008-06-20 | 2011-09-21 | 北京世纪地和科技有限公司 | Pre- desiliconizing method from fly ash or slag |
| CN103649341A (en) * | 2011-07-19 | 2014-03-19 | 杰富意钢铁株式会社 | Method for smelting molten pig iron |
| CN104053794A (en) * | 2012-01-19 | 2014-09-17 | 杰富意钢铁株式会社 | Method for preliminary treatment of molten iron |
| CN104073585A (en) * | 2005-12-08 | 2014-10-01 | 株式会社神户制钢所 | Continuous refining method and continuous refining equipment |
| CN107790649A (en) * | 2016-08-31 | 2018-03-13 | 鞍钢股份有限公司 | Method for directly and continuously casting molten iron into steel billet |
-
2003
- 2003-08-27 CN CN 03150583 patent/CN1273620C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104073585A (en) * | 2005-12-08 | 2014-10-01 | 株式会社神户制钢所 | Continuous refining method and continuous refining equipment |
| CN101306928B (en) * | 2008-06-20 | 2011-09-21 | 北京世纪地和科技有限公司 | Pre- desiliconizing method from fly ash or slag |
| CN102162019A (en) * | 2011-04-06 | 2011-08-24 | 河北钢铁股份有限公司承德分公司 | Multistage combined pretreatment method for vanadium-bearing molten iron |
| CN103649341A (en) * | 2011-07-19 | 2014-03-19 | 杰富意钢铁株式会社 | Method for smelting molten pig iron |
| CN103649341B (en) * | 2011-07-19 | 2016-06-29 | 杰富意钢铁株式会社 | Molten iron method of refining |
| CN104053794A (en) * | 2012-01-19 | 2014-09-17 | 杰富意钢铁株式会社 | Method for preliminary treatment of molten iron |
| CN105087846A (en) * | 2012-01-19 | 2015-11-25 | 杰富意钢铁株式会社 | Method for preliminary treatment of molten iron |
| CN104053794B (en) * | 2012-01-19 | 2016-11-09 | 杰富意钢铁株式会社 | Molten iron pretreatment method |
| US9920390B2 (en) | 2012-01-19 | 2018-03-20 | Jfe Steel Corporation | Method for preliminary treatment of molten iron |
| CN107790649A (en) * | 2016-08-31 | 2018-03-13 | 鞍钢股份有限公司 | Method for directly and continuously casting molten iron into steel billet |
| CN107790649B (en) * | 2016-08-31 | 2019-06-25 | 鞍钢股份有限公司 | Method for directly and continuously casting molten iron into steel billet |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1273620C (en) | 2006-09-06 |
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Granted publication date: 20060906 Termination date: 20160827 |