CN104593538A - Method for separating slag from iron in high-titanium molten iron - Google Patents
Method for separating slag from iron in high-titanium molten iron Download PDFInfo
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- CN104593538A CN104593538A CN201510031207.XA CN201510031207A CN104593538A CN 104593538 A CN104593538 A CN 104593538A CN 201510031207 A CN201510031207 A CN 201510031207A CN 104593538 A CN104593538 A CN 104593538A
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Abstract
The embodiment of the invention discloses a method for separating slag from iron in high-titanium molten iron. The method comprises the following steps: carrying out magnesium spraying and desulfurizing on high-titanium molten iron and adding lime particles into the high-titanium molten iron so as to polymerize desulphurized slag in the high-titanium molten iron; carrying out first skimming on the high-titanium molten iron so that the content of desulphurized slag in the high-titanium molten iron is decreased; adding scale in the high-titanium molten iron, carrying air spraying and stirring on the high-titanium molten iron so that the content of titanium in the high-titanium molten iron is decreased; carrying out second skimming on the high-titanium molten iron so that the content of desulphurized slag in the high-titanium molten iron is further decreased. The method, which is disclosed by the invention, is used for solving the technical problems of waste of molten iron due to difficulty in slag-iron separation when the desulphurized high-titanium molten iron is skimmed in the prior art. The technical effect of cost conservation is achieved.
Description
Technical field
The present invention relates to steelmaking technical field, particularly relate to a kind of slag sluicing system method of high ferrotianium water.
Background technology
In blast furnace ironmaking process, in order to safeguard blast furnace lining, the method that frequent employing adds titanium ore in blast furnace carries out furnace retaining, therefore, titanium content in molten iron can increase, before adopting the desulfurizing iron after titanium ore furnace retaining, titanium content generally can reach between 0.08-0.20%, because the carbon content in molten iron is higher, therefore in molten iron, TiC is generated because carbon and titanium react, the Ti in N in carrier and iron liquid that dusts in this external winding-up process reacts and generates TiN, these two kinds of compounds under molten iron temperature with solid separation, and all there is higher fusing point, thus affect the viscosity of molten iron, mobility is declined, iron shot after desulfurization in desulfurization slag not free settling, form semi-vitreous slag iron consolute slag system, cause difficulty of skimming.
In order to avoid time sulphur caused by desulfurizing slag of hot metal, need to remove desulfurization slag as far as possible, but when in molten iron, titanium content is higher, due to slag sluicing system difficulty, molten iron a large amount of in process of skimming is removed with slag, cause molten iron to lose comparatively large, molten iron loss amount even reaches molten iron 4kg per ton, causes damage larger.
As can be seen here, when the high ferrotianium water after desulfurization is skimmed, there is slag sluicing system difficulty, cause the technical problem of wasting molten iron.
Summary of the invention
The embodiment of the present invention provides a kind of slag sluicing system method of high ferrotianium water, when skimming to the high ferrotianium water after desulfurization in prior art to solve, there is slag sluicing system difficulty, causes the technical problem of wasting molten iron.
The embodiment of the present application provides following technical scheme:
A slag sluicing system method for high ferrotianium water, comprising:
After the desulfurization of spray magnesium is carried out to described high ferrotianium water, in described high ferrotianium water, add lime particle to be polymerized the desulfurization slag in described high ferrotianium water;
Carry out first time to described high ferrotianium water to skim, to reduce the desulfurization slag in described high ferrotianium water;
In described high ferrotianium water, add iron scale, and jet stirring is carried out to described high ferrotianium water, to reduce the titanium content in described high ferrotianium water;
Carry out second time to described high ferrotianium water to skim, to reduce the desulfurization slag in described high ferrotianium water further.
Optionally, describedly in described high ferrotianium water, add lime particle, be specially: the lime particle adding 3 ~ 6kg in described high ferrotianium water per ton.
Optionally, describedly first time is carried out to described high ferrotianium water skim, be specially: first time is carried out to described high ferrotianium water and skims, with remove desulfurization slag total amount in described high ferrotianium water 50% ~ 70% desulfurization slag, wherein, described desulfurization slag total amount for described first time skim and described second time skim clawed desulfurization slag and.
Optionally, describedly in described high ferrotianium water, add iron scale, be specially: the iron scale adding 3 ~ 6kg in described high ferrotianium water per ton, wherein, content >=70% of ferric oxide in described iron scale.
Optionally, described jet stirring is carried out to described high ferrotianium water, be specially: position spray gun being placed on below described high titanium molten iron level 200 ~ 600mm, control the duration of the described high ferrotianium water of the jet stirring of described spray gun 30 ~ 90s, wherein, the total jet amount of described spray gun is the jet 1 ~ 2m of described high ferrotianium water per ton
3.
Optionally, also comprise: the duration leaving standstill described high ferrotianium water 1 ~ 2min before second time skims described to carry out described high ferrotianium water.
Optionally, titanium content >=0.05% in described high ferrotianium water.
The one or more technical schemes provided in the embodiment of the present application, at least have following technique effect or advantage:
The slag sluicing system method of the high ferrotianium water that the embodiment of the present application provides, first in high ferrotianium water, add lime particle to converge the desulfurization slag on surface, and by the preliminary desulfurization slag content reduced on molten iron surface of skimming for the first time, add iron scale again, by the reaction of ferric oxide and titanium, reduce the content of titanium in molten iron, thus reduce the content of titanium carbide and titanium nitride, to reduce molten iron viscosity, be beneficial to slag sluicing system, simultaneously thermopositive reaction because the titanium on iron scale and molten iron surface reacts, the temperature at slag iron interface improves, further reduction molten iron viscosity, be beneficial to slag sluicing system, after slag sluicing system is easy, carry out second time again to skim, reduce the iron water amount carried in the desulfurization slag clawed, achieve cost-saving technique effect.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the schema of the slag sluicing system method of high ferrotianium water in the embodiment of the present invention;
Fig. 2 is the process flow sheet of slag sluicing system in the embodiment of the present invention.
Embodiment
The embodiment of the present invention provides a kind of slag sluicing system method of high ferrotianium water, when skimming to the high ferrotianium water after desulfurization in prior art to solve, there is slag sluicing system difficulty, causes the technical problem of wasting molten iron.Achieve cost-saving technique effect.
In order to solve the technical problem that above-mentioned prior art exists, the general thought of the technical scheme that the embodiment of the present application provides is as follows:
A slag sluicing system method for high ferrotianium water, is characterized in that, comprising:
After the desulfurization of spray magnesium is carried out to described high ferrotianium water, in described high ferrotianium water, add lime particle to be polymerized the desulfurization slag in described high ferrotianium water;
Carry out first time to described high ferrotianium water to skim, to reduce the desulfurization slag in described high ferrotianium water;
In described high ferrotianium water, add iron scale, and jet stirring is carried out to described high ferrotianium water, to reduce the titanium content in described high ferrotianium water;
Carry out second time to described high ferrotianium water to skim, to reduce the desulfurization slag in described high ferrotianium water further.
Can be found out by foregoing, the slag sluicing system method of the high ferrotianium water that the embodiment of the present application provides, first in high ferrotianium water, add lime particle to converge the desulfurization slag on surface, and by the preliminary desulfurization slag content reduced on molten iron surface of skimming for the first time, add iron scale again, by the reaction of ferric oxide and titanium, reduce the content of titanium in molten iron, thus reduce the content of titanium carbide and titanium nitride, to reduce molten iron viscosity, be beneficial to slag sluicing system, simultaneously thermopositive reaction because the titanium on iron scale and molten iron surface reacts, the temperature at slag iron interface improves, further reduction molten iron viscosity, be beneficial to slag sluicing system, after slag sluicing system is easy, carry out second time to skim, reduce the iron water amount carried in the desulfurization slag clawed, achieve cost-saving technique effect.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail, the specific features being to be understood that in the embodiment of the present invention and embodiment is the detailed description to technical solution of the present invention, instead of the restriction to technical solution of the present invention, when not conflicting, the technical characteristic in the embodiment of the present invention and embodiment can combine mutually.
In the embodiment of the present application, provide a kind of slag sluicing system method of high ferrotianium water, please refer to Fig. 1, Fig. 1 is the schema of the slag sluicing system method of a kind of high ferrotianium water in the embodiment of the present invention, and described method comprises:
Step S101, after carrying out the desulfurization of spray magnesium to described high ferrotianium water, adds lime particle to be polymerized the desulfurization slag in described high ferrotianium water in described high ferrotianium water;
Step S102, carries out first time to described high ferrotianium water and skims, to reduce the desulfurization slag in described high ferrotianium water;
Step S103, adds iron scale in described high ferrotianium water, and carries out jet stirring to described high ferrotianium water, to reduce the titanium carbide content in described high ferrotianium water;
Step S104, carries out second time to described high ferrotianium water and skims, to reduce the desulfurization slag in described high ferrotianium water further.
Below in conjunction with the complete process flow of the slag sluicing system of high ferrotianium water, the above-mentioned slag sluicing system method of high ferrotianium water that utilizes is described in detail:
Please refer to Fig. 2, Fig. 2 is the process flow sheet of slag sluicing system in the embodiment of the present invention.
As shown in Figure 2, first, in iron manufacturing process, in blast furnace, add titanium ore, generate high ferrotianium water.
Specifically, adding titanium ore can safeguard blast furnace lining, and the molten iron titaniferous amount after titanium ore that adds increases, for high ferrotianium water, in the embodiment of the present application, when titanium content >=0.05% in described high ferrotianium water, be applicable to the slag sluicing system method adopting high ferrotianium water provided by the invention.
Next, to the desulfurization of described high titanium Magnesium Injection In Molten Iron.
Subsequently, in described high ferrotianium water, lime particle is added.
Namely perform step S101, after the desulfurization of spray magnesium is carried out to described high ferrotianium water, in described high ferrotianium water, add lime particle to be polymerized the desulfurization slag in described high ferrotianium water.
Specifically, because lime has the feature that desulfurization slag can be made to be polymerized, thus add on the surface of described high ferrotianium water lime particle can be beneficial to desulfurization slag polymerization;
In the embodiment of the present application, in described high ferrotianium water, add lime particle, be specifically as follows: the lime particle adding 3 ~ 6kg in described high ferrotianium water per ton.
Certainly, in specific implementation process, also can be add lime powder in described high ferrotianium water.
Subsequently, carry out first time to skim.
Namely perform step S102, first time is carried out to described high ferrotianium water and skims, to reduce the desulfurization slag in described high ferrotianium water.
In the embodiment of the present application, describedly first time carried out to described high ferrotianium water skim, be specially:
Carry out first time to described high ferrotianium water to skim, with remove desulfurization slag total amount in described high ferrotianium water 50% ~ 70% desulfurization slag, wherein, described desulfurization slag total amount for described first time skim and described second time skim clawed desulfurization slag and, wherein, described 50% ~ 70% is mass percent.
Specifically, because lime particle have accumulated desulfurization slag, therefore described first time skim can when ensure do not carry molten iron, claw most desulfurization slag, after skimming through described first time, the desulfurization quantity of slag in described high ferrotianium water is less, and the liquid level of described high ferrotianium water can go out by partial denudation.
Subsequently, in described high ferrotianium water, iron scale is added and jet stirring.
Namely perform step S103, in described high ferrotianium water, add iron scale, and jet stirring is carried out to described high ferrotianium water, to reduce the titanium content in described high ferrotianium water.
In the embodiment of the present application, describedly in described high ferrotianium water, add iron scale, be specially:
The iron scale of 3 ~ 6kg is added in described high ferrotianium water per ton, wherein, content >=70% of ferric oxide in described iron scale.
In specific implementation process, described iron scale can be the iron scale produced in rolling process, with cost-saving.
In the embodiment of the present application, described jet stirring is carried out to described high ferrotianium water, is specially:
Spray gun is placed on the position of below described high titanium molten iron level 200 ~ 600mm, controls the duration of the described high ferrotianium water of the jet stirring of described spray gun 30 ~ 90s, wherein, the total jet amount of described spray gun is the jet 1 ~ 2m of described high ferrotianium water per ton
3.
In specific implementation process, the gas of described spray gun spray can be air or rare gas element, and this is not restricted.
Specifically, the reactive chemistry formula of iron scale and titanium can be:
2FeO+Ti→TiO
2+2Fe
Specifically, iron scale is added in described high ferrotianium water, and with the mixture of high ferrotianium water and iron scale described in the gas strong mixing of spray gun ejection, because the titanium on iron scale and molten iron surface reacts, region titanium content near scum interface is reduced, and then make to reduce near TiC and the TiN content at slag iron interface in molten iron, and the TiO that reaction generates
2be easy to enter in desulfurization slag, therefore be conducive to reducing molten iron viscosity, be beneficial to slag sluicing system; Be simultaneously thermopositive reaction because iron scale react with the titanium on molten iron surface, the temperature raising at slag iron interface, is beneficial to reduction molten iron viscosity further, is beneficial to slag sluicing system.
Subsequently, high ferrotianium water is left standstill.
In the embodiment of the present application, the duration of described high ferrotianium water 1 ~ 2min can be left standstill, to make the desulfurization slag in molten iron fully float to high ferrotianium water surface, carry out second time so that follow-up and skim.
Finally, carry out second time to skim.
Namely perform step S104, second time is carried out to described high ferrotianium water and skims, to reduce the desulfurization slag in described high ferrotianium water further.
Specifically, owing to being reduced the content of the titanium carbide in high ferrotianium water by ferric oxide, therefore slag sluicing system is easy, iron water amount is carried low when second time is skimmed, after second time is skimmed, after skimming, the desulfurization quantity of slag on molten iron surface can control, at molten iron≤0.5kg per ton, to reach more than 95% bright, and that can effectively avoid molten iron slag to bring returns sulphur.
Below, according to method provided by the invention, provide the embodiment of the high ferrotianium water of three kinds of different titaniferous amounts being carried out to slag sluicing system:
Embodiment one, before desulfurization, high ferrotianium water constituent mass percent is: C content is 4.30%, Si content be 0.38%, Mn content be 0.10%, P content be 0.093%, S content be 0.039, Ti content is 0.12.Molten iron temperature is 1348 DEG C.
Desulfurization is dusted high ferrotianium water consumption granular magnesium 0.63kg per ton in process, and after desulfurization, high ferrotianium water constituent mass percent is: C content is 4.28%, Si content is 0.33%, Mn content is 0.11%, P content be 0.095%, S content is 0.003, Ti content is 0.08, and molten iron temperature is 1329 DEG C.
Add lime particle at high ferrotianium water surface, add-on is high ferrotianium water 4.5kg per ton, carries out first time and takes off slag operation, take off the quantity of slag by percentage to the quality after adding, and is 60% of desulfurization slag total amount in high ferrotianium water;
First time skims after end, the iron scale produced in rolling process is added to high ferrotianium surface waterborne, in iron scale, iron oxide content is 83%, add-on is high ferrotianium water 5kg per ton, spray gun is used to stir to high ferrotianium water blows air afterwards, position of lances is 400mm below high titanium molten iron level, and churning time is 60s, and air-blowing quantity controls at high ferrotianium water 2m per ton
3;
After winding-up stirring terminates, high ferrotianium water is left standstill 2min, carry out second time again and take off slag operation, remove the whole remaining desulfurization slag of high ferrotianium water surface, the bright face that after skimming, high ferrotianium water meter is bright accounts for more than 95%, final iron loss is molten iron 0.45kg per ton, and in prior art, the iron loss of molten iron 4kg per ton, achieves cost-saving.
Embodiment two, before desulfurization, high ferrotianium water constituent mass percent is: C content is 4.16%, Si content be 0.42%, Mn content be 0.12%, P content be 0.091%, S content be 0.047, Ti content is 0.15, and molten iron temperature is 1326 DEG C.
Desulfurization is dusted high ferrotianium water consumption granular magnesium 0.68kg per ton in process, and after desulfurization, high ferrotianium water constituent mass percent is: C content is 4.18%, Si content is 0.40%, Mn content is 0.11%, P content be 0.090%, S content is 0.002, Ti content is 0.07, and molten iron temperature is 1325 DEG C.
Add lime particle at high ferrotianium water surface, add-on is high ferrotianium water 5kg per ton, carries out first time and takes off slag operation, take off the quantity of slag by percentage to the quality after adding, and is 70% of desulfurization slag total amount in high ferrotianium water;
First time skims after end, the iron scale produced in rolling process is added to high ferrotianium surface waterborne, in iron scale, iron oxide content is 76%, add-on is high ferrotianium water 5kg per ton, spray gun is used to stir to high ferrotianium water blows air afterwards, position of lances is 400mm below high titanium molten iron level, and churning time is 65s, and air-blowing quantity controls at high ferrotianium water 2m per ton
3;
After winding-up stirring terminates, high ferrotianium water is left standstill 2min, carry out second time again and take off slag operation, remove the whole remaining desulfurization slag of high ferrotianium water surface, the bright face that after skimming, high ferrotianium water meter is bright accounts for more than 95%, final iron loss is molten iron 0.50kg per ton, and in prior art, the iron loss of molten iron 4kg per ton, achieves cost-saving.
Before embodiment three, desulfurization, high ferrotianium water constituent mass percent is: C content is 4.33%, Si content be 0.31%, Mn content be 0.10%, P content be 0.091%, S content be 0.029, Ti content is 0.11, and molten iron temperature is 1337 DEG C.
Desulfurization is dusted high ferrotianium water consumption granular magnesium 0.60kg per ton in process, and after desulfurization, high ferrotianium water constituent mass percent is: C content is 4.22%, Si content is 0.29%, Mn content is 0.11%, P content be 0.091%, S content is 0.004, Ti:0.05, molten iron temperature is 1331 DEG C.
Add lime particle at high ferrotianium water surface, add-on is high ferrotianium water 4kg per ton, carries out first time and takes off slag operation, take off the quantity of slag by percentage to the quality after adding, and is 50% of desulfurization slag total amount in high ferrotianium water;
First time skims after end, the iron scale produced in rolling process is added to high ferrotianium surface waterborne, in iron scale, iron oxide content is 74%, add-on is high ferrotianium water 6kg per ton, spray gun is used to stir to high ferrotianium water blows air afterwards, position of lances is 400mm below high titanium molten iron level, and churning time is 70s, and air-blowing quantity controls at high ferrotianium water 2m per ton
3;
After winding-up stirring terminates, high ferrotianium water is left standstill 2min, carry out second time again and take off slag operation, remove the whole remaining slag of high ferrotianium water surface, the bright face that after skimming, high ferrotianium water meter is bright accounts for more than 95%, final iron loss is molten iron 0.40kg per ton, and in prior art, the iron loss of molten iron 4kg per ton, achieves cost-saving.
Technical scheme in above-mentioned the embodiment of the present application, at least has following technique effect or advantage:
The slag sluicing system method of the high ferrotianium water that the embodiment of the present application provides, first in high ferrotianium water, add lime particle to converge the desulfurization slag on surface, and by the preliminary desulfurization slag content reduced on molten iron surface of skimming for the first time, add iron scale again, by the reaction of ferric oxide and titanium, reduce the content of titanium in molten iron, thus reduce the content of titanium carbide and titanium nitride, to reduce molten iron viscosity, be beneficial to slag sluicing system, simultaneously thermopositive reaction because the titanium on iron scale and molten iron surface reacts, the temperature at slag iron interface improves, further reduction molten iron viscosity, be beneficial to slag sluicing system, after slag sluicing system is easy, carry out second time to skim, reduce the iron water amount carried in the desulfurization slag clawed, achieve cost-saving technique effect.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (7)
1. a slag sluicing system method for high ferrotianium water, is characterized in that, comprising:
After the desulfurization of spray magnesium is carried out to described high ferrotianium water, in described high ferrotianium water, add lime particle to be polymerized the desulfurization slag in described high ferrotianium water;
Carry out first time to described high ferrotianium water to skim, to reduce the desulfurization slag in described high ferrotianium water;
In described high ferrotianium water, add iron scale, and jet stirring is carried out to described high ferrotianium water, to reduce the titanium content in described high ferrotianium water;
Carry out second time to described high ferrotianium water to skim, to reduce the desulfurization slag in described high ferrotianium water further.
2. the method for claim 1, is characterized in that, describedly in described high ferrotianium water, adds lime particle, is specially:
The lime particle of 3 ~ 6kg is added in described high ferrotianium water per ton.
3. the method for claim 1, is characterized in that, describedly carries out first time to described high ferrotianium water and skims, and is specially:
Carry out first time to described high ferrotianium water to skim, with remove desulfurization slag total amount in described high ferrotianium water 50% ~ 70% desulfurization slag, wherein, described desulfurization slag total amount for described first time skim and described second time skim clawed desulfurization slag and.
4. the method for claim 1, is characterized in that, describedly in described high ferrotianium water, adds iron scale, is specially:
The iron scale of 3 ~ 6kg is added in described high ferrotianium water per ton, wherein, content >=70% of ferric oxide in described iron scale.
5. method as claimed in claim 4, is characterized in that, describedly carries out jet stirring to described high ferrotianium water, is specially:
Spray gun is placed on the position of below described high titanium molten iron level 200 ~ 600mm, controls the duration of the described high ferrotianium water of the jet stirring of described spray gun 30 ~ 90s, wherein, the total jet amount of described spray gun is the jet 1 ~ 2m of described high ferrotianium water per ton
3.
6. method as claimed in claim 5, is characterized in that, also comprises before second time skims described to carry out described high ferrotianium water:
Leave standstill the duration of described high ferrotianium water 1 ~ 2min.
7. the method as described in as arbitrary in claim 1-6, is characterized in that, titanium content >=0.05% in described high ferrotianium water.
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| CN101338348A (en) * | 2008-07-28 | 2009-01-07 | 武汉钢铁(集团)公司 | Slag diluent for molten iron desulphurization slag |
| CN101805818A (en) * | 2010-04-01 | 2010-08-18 | 钢铁研究总院 | Method for removing titanium from ladle by using stirring method |
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| CN101338348A (en) * | 2008-07-28 | 2009-01-07 | 武汉钢铁(集团)公司 | Slag diluent for molten iron desulphurization slag |
| CN101805818A (en) * | 2010-04-01 | 2010-08-18 | 钢铁研究总院 | Method for removing titanium from ladle by using stirring method |
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| 李伟东 等: "含钛铁水脱硫及转炉冶炼实践", 《鞍钢技术》, no. 5, 31 October 2013 (2013-10-31), pages 44 - 47 * |
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