CN110468256A - Using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process - Google Patents
Using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process Download PDFInfo
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- CN110468256A CN110468256A CN201910910194.1A CN201910910194A CN110468256A CN 110468256 A CN110468256 A CN 110468256A CN 201910910194 A CN201910910194 A CN 201910910194A CN 110468256 A CN110468256 A CN 110468256A
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- molten iron
- dephosphorization
- oxygen
- desulfurization
- desiliconization
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention belongs to field of iron and steel smelting, it is specially a kind of using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process.Side-blown oxygen rifle is added on the basis of KR method mechanical stirring device, oxygen rifle is located at processing position upper stage, when it is in oxygen blast position, gun body and the vertical interval of stirring-head column are 300mm, the impulse stroke of oxygen rifle reaches 3000mm, the minimum spacing of pipette tips nozzle and opposite side ladle inner wall is 600mm, nozzle location can be manually adjusted when oxygen blast and avoids molten iron splash, also guarantee that oxygen flow will not blow to column and will not blow through molten iron to molten iron ladle-lining, resistance to material is caused to deteriorate seriously.Oxygen blast desiliconization of the present invention and dephosphorization solve the problems, such as that being previously joined a large amount of iron scale fusing heat absorptions causes molten iron heat-energy losses, molten iron temperature improves about 30~45 DEG C more than the latter, advantageous dynamics, thermodynamic condition are created for dephosphorization, desulfurization, hence it is evident that improve dephosphorization rate and desulfurization degree.
Description
Technical field
It is specially a kind of to carry out desiliconization of hot metal using KR-OB method, dephosphorization, take off the present invention relates to hot metal pre process procedures
The pretreating process of sulphur, belongs to field of iron and steel smelting.
Background technique
With economic development and scientific and technological progress, demand sustainable growth of the society to special steel, thin plate steel, Automobile Plate, family
The market sales volume of the high-end products such as battery plate, silicon steel, pipe line steel is stepping up.For the capability and performance for improving special steel, each steel grade
It is also more stringent to the content requirement of harmful element P, S.Currently, to reach the quality requirement of product, each steel mill is smelting special type
Molten iron pretreatment is all first passed through when steel carries out dephosphorization, desulfurization process.For the chemical reaction condition for meeting dephosphorization of molten iron, desulfurization, go back
One of desiliconization processing need to be first carried out, this three processing may be simply referred to as molten iron " three is de- ".
Currently, one of most widely used most representational molten iron pretreatment method is exactly KR mechanical stirring in the world
Method.Carrying out molten iron " three is de- " using KR mechanical mixing method is exactly that stirring-head blade made of refractory material is inserted under molten iron level
Certain depth, and rotated according to certain revolving speed, molten iron can rotate to form " V " shape vortex with stirring-head, make the iron oxide being added
The particles such as skin, lime, fluorite are dispersed in vortex due to turbulence, and along radial direction " discharge ", are then rotated around axle center
Above float in molten iron.In mechanical agitation process, various particles can be involved in molten iron and uniformly mixing therewith, increase reactant
Contact area and collision probability, create favorable conditions in terms of dynamics for molten iron " three de- ".
A large amount of iron scales and slag former, the melting of these cold burdens need to be added when carrying out desiliconization of hot metal and dephosphorization using KR method
Molten iron amount of heat can be absorbed, is declined to a great extent so as to cause molten iron temperature.According to correlative study data, molten iron temperature decline can be produced
Raw following adverse effect: 1. desulfurization process is endothermic process, and temperature is too low to be unfavorable for its thermodynamic condition；2. from kinetic factor
Consider, diffusion of each element in molten iron and reactant is the key limiting link of each reaction, and temperature is too low to be reduced respectively
The mass tranfer coefficient of reactant is unfavorable for reaction and carries out；3. molten iron temperature is too low, it will cause packet bottom containment wall and glue iron increase iron loss, together
The relatively low smelting of Shi Zaocheng converter calorific value is difficult.Therefore, how on the basis of traditional KR method, with high efficiency, the means of low cost
Solving problem above becomes the vital task of hot metal pre process procedures.
Summary of the invention
In view of the deficiencies of the prior art, the object of the present invention is to provide it is a kind of using KR-OB method carry out desiliconization of hot metal,
Dephosphorization, desulfurization pretreating process, add side-blown oxygen lance on the basis of traditional KR device, utilize oxygen gun blowing and addition
Partial oxidation iron sheet is molten iron oxygen supply, react with Si, P and reaches desiliconizing and dephosphorizing purpose.Because of the gas characteristic of oxygen, reaction
The contact of object is more abundant, and desiliconization and dephosphorization effect are significant, moreover it is possible to iron scale dosage is reduced, to reduce because of a large amount of iron oxide
Temperature loss caused by skin is added.
Technical scheme is as follows:
It is a kind of using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process, locate in advance using in KR method molten iron
Increase the design of side-blown oxygen rifle on the basis of reason device, takes blast furnace off behind the pretreatment position of ladle arrival molten iron preprocessing unit
Slag simultaneously carries out thermometric sampling, falls stirring-head stirring molten iron, with addition of iron scale and oxygen gun blowing desiliconization is fallen, after desiliconization
Take desiliconization slag and thermometric sampling off；Carry out dephosphorization treatment later, oxygen blast and with addition of iron scale and slag former is stirred oxygen blast
Dephosphorization, skims after dephosphorization and thermometric sampling；Finally carry out desulfurization process, stir molten iron and be added slag former be stirred it is de-
Sulphur, skims after desulfurization and thermometric samples；After ingredient is qualified, molten iron is hoisted to converter.
It is described using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process, side-blown oxygen rifle is arranged in iron
The pretreatment position upper stage of water pre-treatment means, when side-blown oxygen rifle is in oxygen blast position gun body it is vertical with stirring-head column away from
From being 250~350mm, the impulse stroke of side-blown oxygen rifle reaches 3000mm, in the pipette tips nozzle and opposite side ladle of side-blown oxygen rifle
The minimum linear distance of wall is 600mm, and when oxygen blast manually adjusts pipette tips nozzle location and avoids molten iron splash.
It is described using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process, in molten steel pocket deslagging return
Afterwards, stirring-head is down to setting position and rotation speed when reaching 55~65r/min, add iron scale and slag former carry out desiliconization and
Dephosphorization, revolving speed fall oxygen gun blowing in 90~110r/min, adjust oxygen rifle position according to oxygen blast effect；At desiliconization and dephosphorization
After reason, it will first lift oxygen rifle and rise stirring-head again, then carry out operation of skimming, carry out desulfurization later.
It is described using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process, molten iron weight in ladle
Amount is 70 ± 5 tons, ingredient and mass percent meet C:3.0~4.5%, Si:0.40~0.60%, Mn:0.20~0.50%,
P:0.100~0.200%, S:0.015~0.100%, temperature are greater than 1300 DEG C.
It is described using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process, the physics and chemistry of iron scale refers to
Mark: by mass percentage, TFe >=65%, FeO >=57%, Fe2O3>=40%, SiO2≤ 0.82%, P≤0.029%, S≤
0.056%, 1~5mm of granularity；Slag former is made of lime and fluorite by 10: 1 quality proportioning, granularity 0.5~1.5mm it
Between account for 80wt% or more, be less than 0.5mm and be greater than 1.5mm < 10wt%；The physical and chemical index of lime: by mass percentage,
CaO >=90%, S≤0.050%, scaling loss≤2%, the physical and chemical index of fluorite: by mass percentage, CaF2>=85%, S≤
0.2%, H2O≤1%, SiO2≤ 4%.
It is described using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process, be added iron scale 8~
Rifle oxygen blast desiliconization drops in 11kg/t molten iron, controls 20~30Nm of oxygen flow3/ min, oxygen blow duration is in 8min；After desiliconization
It skims and thermometric sampling, molten iron temperature reaches 1340~1360 DEG C, Si content is less than 0.15wt%.
It is described using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process, be added iron scale 9~
Rifle oxygen blast dephosphorization drops in 10kg/t molten iron and slag former 9~10kg/t molten iron, controls 10~20Nm of oxygen flow3/ min, when oxygen blast
Between in 8min；It skims after dephosphorization and thermometric sampling, molten iron temperature reaches 1320~1340 DEG C, P content is less than
0.015wt%.
It is described using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process, be added slag former 8~
12kg/t molten iron, mixing time control skim in 9min, after desulfurization and thermometric sampling, molten iron temperature reach 1290 DEG C with
On, S content is less than 0.001wt%.
Design philosophy of the invention is:
The present invention provides it is a kind of using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process, innovation
Point is: increase the design of side-blown oxygen rifle on the basis of KR method molten iron preprocessing unit, oxygen rifle is arranged in processing position upper stage,
Installation maintenance is simple and convenient；When oxygen rifle is in oxygen blast position, gun body and the vertical range of stirring-head column are 300mm, the work of oxygen rifle
Reach 3000mm as stroke, the minimum linear distance of pipette tips nozzle and opposite side ladle inner wall is 600mm, and when oxygen blast can be manual
It adjusts pipette tips nozzle location and avoids molten iron splash, the stirring-head that also guarantee oxygen flow will not blow to molten iron preprocessing unit is stood
Column will not blow through molten iron to molten iron ladle-lining, resistance to material is caused to deteriorate seriously.To by designing the side-blown process flow of oxygen rifle
It is designed with station, with raising " three is de- " efficiency, reduces molten steel and splash and corroded with resistance to material.
The invention has the advantages and beneficial effects that:
Oxygen blast desiliconization of the present invention solves the problems, such as that a large amount of iron scale fusing heat absorptions, which are added, causes molten iron heat-energy losses, mentions
High molten iron heat, effectively improves 30~45 DEG C of molten iron temperature, is that advantageous dynamics, thermodynamic condition are created in dephosphorization, desulfurization,
Improve the mass tranfer coefficient of the reactants such as P, S, hence it is evident that improve desulfurization degree, reduce target sulphur content.
Detailed description of the invention
Fig. 1 is the simple layout drawing of KR-OB device.
Fig. 2 is the simple signal of oxygen gun blowing.Wherein, (a) main view, (b) left view, (c) top view.
Wherein: 1: storage bin, 2: storage bin rotary feeder, 3: weighing storehouse, 4: weighing storehouse rotary feeder, 5: is flexible to add
Expects pipe, 6: ladle, 7: hot-metal ladle and carriage, 8: stirring-head rotating electric machine, 9: stirring-head, 10: side-blown oxygen rifle, 11: stirring-head column.
Specific embodiment
As Figure 1-Figure 2, mechanical stirring-oxygen blast (KR-OB) device of the present invention specifically includes that storage bin 1, storage bin rotation
It is given to glassware 2, storehouse 3 is weighed, weighs storehouse rotary feeder 4, flexible charge pipe 5, ladle 6, hot-metal ladle and carriage 7, stirring-head rotation
Motor 8, stirring-head 9, side-blown oxygen rifle 10, stirring-head column 11 etc., specific structure is as follows:
The bottom of storage bin 1 is connected by storage bin rotary feeder 2 with storehouse 3 is weighed, and the bottom for weighing storehouse 3 passes through title
Amount storehouse rotary feeder 4 is connected with one end of flexible charge pipe 5, and flexible charge pipe 5 is obliquely installed, the other end and hot-metal bottle
Ladle 6 on vehicle 7 is connected.The top setting stirring-head rotating electric machine 8 and side-blown oxygen rifle 10 of ladle 6, stirring-head rotation
Stirring-head 9 corresponding with ladle 6 is installed by stirring-head column 11 in 8 lower end of motor, and side-blown oxygen rifle 10 is obliquely installed, lower end
It is corresponding with ladle 6 by pipette tips nozzle.
As shown in Fig. 2, the technical process that KR-OB method of the present invention carries out molten iron " three is de- " is: 1. utilizing hot-metal ladle and carriage 7
Operation of skimming is carried out after the ladle 6 for filling molten iron is sent to processing position；2. opening is stirred after falling stirring-head 9 to setting position
A rotating electric machine 8 is mixed, after revolving speed reaches 60r/min, by weighing storehouse 3 and weighing storehouse rotary feeder 4 for 1 internal oxidition of storage bin
Molten iron is added in iron sheet and slag former；4. falling side-blown oxygen rifle 10 after improving 9 revolving speed to 90~110r/min of stirring-head, passing through side
The pipette tips nozzle of 10 one end of oxygen-blowing gun extends to and carries out oxygen blast in ladle 6, and pipette tips nozzle is along oxygen blast direction and opposite side ladle 6
The minimum spacing of wall is 600mm, and side-blown oxygen rifle 10 is located at the gun body part in ladle 6 and the vertical range of stirring-head column 11
It is 300mm, oxygen rifle position is suitably adjusted according to oxygen blast effect, oxygen flow and oxygen blow duration is controlled, skims after desiliconization
And thermometric samples；6. and then successively progress dephosphorization treatment and desulfurization process, desulfurization process do not need oxygen gun blowing, hot metal composition conjunction
After lattice, molten iron is hoisted to converter.
In the specific implementation process, the present invention enter the station molten iron weight at 70 ± 5 tons (t), ingredient and mass percent are full
Sufficient C:3.0~4.5%, Si:0.40~0.60%, Mn:0.20~0.50%, P:0.100~0.200%, S:0.015~
0.100%, temperature is greater than 1300 DEG C.
After molten steel pocket deslagging return, stirring-head is down to setting position and when rotation speed reaches 60r/min, addition oxidation
Iron sheet and slag former carry out desiliconization and dephosphorization, when revolving speed reaches 90~110r/min, fall oxygen gun blowing, suitable according to oxygen blast effect
When adjustment oxygen rifle position；First lift oxygen rifle after desiliconization or dephosphorization treatment and rise stirring-head again, then carries out operation of skimming, it
After carry out desulfurization.
The physical and chemical index of iron scale: by mass percentage, TFe >=65%, FeO >=57%, Fe2O3>=40%, SiO2
≤ 0.82%, P≤0.029%, S≤0.056%, 1~5mm of granularity；Slag former is pressed 10: 1 quality proportioning by lime and fluorite
Composition, granularity accounts for 80wt% or more between 0.5~1.5mm, be less than 0.5mm and be greater than 1.5mm < 10wt%；The reason of lime
Change index: by mass percentage, the physical and chemical index of fluorite: CaO >=90%, S≤0.050%, scaling loss≤2% press quality hundred
Divide than meter, CaF2>=85%, S≤0.2%, H2O≤1%, SiO2≤ 4%.
Below in conjunction with attached drawing, application of the invention is described further by example.
Embodiment 1:
In the present embodiment, blast furnace slag and thermometric sampling, molten iron after contents temperature is qualified are taken off first after 70t molten iron enters the station
Packet return falls stirring-head later and 700kg iron scale is added when reaching 60r/min, improves revolving speed extremely to position, revolving speed is set
95r/min forms molten iron vortex, falls side-blown oxygen rifle, and the inner wall 700mm of nozzle distance opposite ladle is blown to molten iron vortex wall
Oxygen, oxygen flow is in 25Nm3Successively lift side-blown oxygen rifle and stirring-head after/min, oxygen blast 8min, then skim and thermometric samples,
Si content and temperature meet target call in molten iron；After ladle return, declines stirring-head again and 650kg iron scale is added
With 680kg slag former, the process that feeds is as above, then falls side-blown oxygen rifle to molten iron and is vortexed wall oxygen blast, oxygen flow is in 15Nm3/
Successively lift side-blown oxygen rifle and stirring-head after min, oxygen blast 7.5min, then skims and thermometric samples, P content and temperature in molten iron
Meet target call；After molten steel pocket deslagging terminates return, simultaneously 650kg desulfurizing agent, feed streams are added in decline stirring-head stirring molten iron
Journey is as above, lifts stirring-head after stirring 9min, then skims and thermometric samples, S content and temperature meet target call in molten iron；
Finally, qualified molten iron is sent to pneumatic steelmaking.
The results are shown in Table 1 for thermometric sampling every time in molten iron " three is de- " process of embodiment 1.
Embodiment 2:
In the present embodiment, blast furnace slag and thermometric sampling, molten iron after contents temperature is qualified are taken off first after 72t molten iron enters the station
Packet return falls stirring-head later and 620kg iron scale is added when reaching 60r/min, improves revolving speed extremely to position, revolving speed is set
95r/min forms molten iron vortex, falls side-blown oxygen rifle, and the inner wall 720mm of nozzle distance opposite ladle is blown to molten iron vortex wall
Oxygen, oxygen flow is in 25Nm3Successively lift side-blown oxygen rifle and stirring-head after/min, oxygen blast 8min, then skim and thermometric samples,
Si content and temperature meet target call in molten iron；After ladle return, declines stirring-head again and 650kg iron scale is added
With 680kg slag former, the process that feeds is as above, then falls side-blown oxygen rifle to molten iron and is vortexed wall oxygen blast, oxygen flow is in 15Nm3/
Successively lift oxygen rifle and stirring-head after min, oxygen blast 8min, then skims and thermometric samples, P content and temperature meet mesh in molten iron
Mark requires；After molten steel pocket deslagging terminates return, simultaneously 700kg desulfurizing agent is added in decline stirring-head stirring molten iron, and charging process is as above,
Lift stirring-head after stirring 8min, then skims and thermometric samples, S content and temperature meet target call in molten iron；Finally, will
Qualified molten iron is sent to pneumatic steelmaking.
The results are shown in Table 1 for thermometric sampling every time in molten iron " three is de- " process of embodiment 2.
Embodiment 3:
In the present embodiment, blast furnace slag and thermometric sampling, molten iron after contents temperature is qualified are taken off first after 69t molten iron enters the station
Packet return falls stirring-head later and 600kg iron scale is added when reaching 60r/min, improves revolving speed extremely to position, revolving speed is set
100r/min forms molten iron vortex, falls side-blown oxygen rifle, and the inner wall 680mm of nozzle distance opposite ladle is vortexed wall to molten iron
Oxygen blast, oxygen flow is in 25Nm3Successively lift oxygen rifle and stirring-head after/min, oxygen blast 8min, then skims and thermometric samples, iron
Si content and temperature meet target call in water；After ladle return, again decline stirring-head and be added 450kg iron scale and
500kg slag former, charging process is as above, then falls side-blown oxygen rifle to molten iron and is vortexed wall oxygen blast, oxygen flow is in 15Nm3/
Successively lift oxygen rifle and stirring-head after min, oxygen blast 7min, then skims and thermometric samples, P content and temperature meet mesh in molten iron
Mark requires；After molten steel pocket deslagging terminates return, simultaneously 600kg desulfurizing agent is added in decline stirring-head stirring molten iron, and charging process is as above,
Lift stirring-head after stirring 8min, then skims and thermometric samples, S content and temperature meet target call in molten iron；Finally, will
Qualified molten iron is sent to pneumatic steelmaking.
The results are shown in Table 1 for thermometric sampling every time in molten iron " three is de- " process of embodiment 3.
The ingredient (mass percent wt%) and temperature of each thermometric sampling in each embodiment of table 1
Embodiment the result shows that, the present invention adds the design of side-blown oxygen rifle, oxygen on the basis of KR method mechanical stirring device
Rifle position is in processing position upper stage, and when it is in oxygen blast position, gun body and the vertical interval of stirring-head column are 300mm, oxygen rifle
Impulse stroke reaches 3000mm, and the minimum spacing of the inner wall of pipette tips nozzle and opposite side ladle is 600mm, and when oxygen blast can be manual
It adjusts nozzle location and avoids molten iron splash, also guarantee that oxygen flow will not blow to column and will not blow through in molten iron to ladle
Lining, causes resistance to material to deteriorate seriously.In molten iron " three is de- " processing, most of iron scale is substituted using oxygen blast, O oxidation Si is provided
And P, carry out desiliconization processing and dephosphorization treatment.
Claims (8)
1. it is a kind of using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process, which is characterized in that using in KR method
Increase the design of side-blown oxygen rifle on the basis of molten iron preprocessing unit, after ladle reaches the pretreatment position of molten iron preprocessing unit
It takes blast furnace slag off and carries out thermometric sampling, fall stirring-head stirring molten iron, with addition of iron scale and fall oxygen gun blowing desiliconization, take off
Take desiliconization slag and thermometric sampling after silicon off；Carry out dephosphorization treatment later, oxygen blast and with addition of iron scale and slag former carries out
Oxygen blast dephosphorization is stirred, skims after dephosphorization and thermometric samples；Finally carry out desulfurization process, stir molten iron and be added slag former into
Row stirring desulphurization, skims after desulfurization and thermometric samples；After ingredient is qualified, molten iron is hoisted to converter.
2. it is according to claim 1 using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process, feature
It is, side-blown oxygen rifle is arranged in the pretreatment position upper stage of molten iron preprocessing unit, the rifle when side-blown oxygen rifle is in oxygen blast position
The vertical range of body and stirring-head column is 250~350mm, and the impulse stroke of side-blown oxygen rifle reaches 3000mm, side-blown oxygen rifle
The minimum linear distance of pipette tips nozzle and opposite side ladle inner wall is 600mm, and when oxygen blast manually adjusts pipette tips nozzle location and avoids
Molten iron splash.
3. it is according to claim 1 or 2 using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process,
It is characterized in that, after molten steel pocket deslagging return, stirring-head is down to setting position and rotation speed when reaching 55~65r/min, addition
Iron scale and slag former carry out desiliconization and dephosphorization, revolving speed fall oxygen gun blowing in 90~110r/min, according to oxygen blast effect
Adjust oxygen rifle position；After desiliconization and dephosphorization treatment, it will first lift oxygen rifle and rise stirring-head again, then carry out work of skimming
Industry carries out desulfurization later.
4. it is according to claim 1 using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process, feature
Be, the weight of molten iron in ladle is 70 ± 5 tons, ingredient and mass percent meet C:3.0~4.5%, Si:0.40~
0.60%, Mn:0.20~0.50%, P:0.100~0.200%, S:0.015~0.100%, temperature are greater than 1300 DEG C.
5. it is according to claim 1 or 3 using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process,
It is characterized in that, the physical and chemical index of iron scale: by mass percentage, TFe >=65%, FeO >=57%, Fe2O3>=40%,
SiO2≤ 0.82%, P≤0.029%, S≤0.056%, 1~5mm of granularity；Slag former is pressed 10: 1 quality by lime and fluorite
Proportion composition, granularity accounts for 80wt% or more between 0.5~1.5mm, be less than 0.5mm and be greater than 1.5mm < 10wt%；Lime
Physical and chemical index: by mass percentage, CaO >=90%, S≤0.050%, scaling loss≤2%, the physical and chemical index of fluorite: press matter
Measure percentages, CaF2>=85%, S≤0.2%, H2O≤1%, SiO2≤ 4%.
6. it is according to claim 1 using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process, feature
It is, 8~11kg/t of iron scale molten iron is added, drop rifle oxygen blast desiliconization, controls 20~30Nm of oxygen flow3/ min, when oxygen blast
Between in 8min；It skims after desiliconization and thermometric sampling, molten iron temperature reaches 1340~1360 DEG C, Si content is less than
0.15wt%.
7. it is according to claim 1 using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process, feature
It is, 9~10kg/t of iron scale molten iron and slag former 9~10kg/t molten iron is added, drop rifle oxygen blast dephosphorization, controls oxygen flow
10~20Nm3/ min, oxygen blow duration is in 8min；It skims after dephosphorization and thermometric sampling, molten iron temperature reaches 1320~
1340 DEG C, P content is less than 0.015wt%.
8. it is according to claim 1 using KR-OB method carry out desiliconization of hot metal, dephosphorization, desulfurization pretreating process, feature
It is, 8~12kg/t of slag former molten iron is added, mixing time control is skimmed in 9min, after desulfurization and thermometric sampling, iron
Coolant-temperature gage reaches 1290 DEG C or more, and S content is less than 0.001wt%.
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| CN113801976A (en) * | 2020-06-17 | 2021-12-17 | 宝山钢铁股份有限公司 | High-efficiency KR desulfurization hot-metal bottle |
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| JPS6063305A (en) * | 1983-09-16 | 1985-04-11 | Nippon Steel Corp | Method for producing high-purity pig |
| CN101921889A (en) * | 2002-08-27 | 2010-12-22 | 杰富意钢铁株式会社 | The manufacture method of low-phosphorous molten iron |
| CN101376916A (en) * | 2008-09-29 | 2009-03-04 | 山西太钢不锈钢股份有限公司 | Pretreatment method of dephosphorization, desiliconization and desophorization for hot metal |
| JP2015040325A (en) * | 2013-08-22 | 2015-03-02 | Ｊｆｅスチール株式会社 | Preliminary treatment method of molten iron |
| CN105734194A (en) * | 2014-12-09 | 2016-07-06 | 重庆市金升机械配件制造有限公司 | Molten iron pre-desilication process for converter steelmaking |
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| CN113801976A (en) * | 2020-06-17 | 2021-12-17 | 宝山钢铁股份有限公司 | High-efficiency KR desulfurization hot-metal bottle |
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