CN109161634A - The low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in a kind of converter smelting - Google Patents
The low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in a kind of converter smelting Download PDFInfo
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- CN109161634A CN109161634A CN201811155329.XA CN201811155329A CN109161634A CN 109161634 A CN109161634 A CN 109161634A CN 201811155329 A CN201811155329 A CN 201811155329A CN 109161634 A CN109161634 A CN 109161634A
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/32—Blowing from above
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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
- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a kind of low silicon high phosphorus hot metal (Mn0.70-0.90wt% of manganese in converter smelting, Si 0.06-0.15wt%, P 0.130-0.220wt%, S≤0.045wt%) propose the preparation method that carbon protects manganese, this method is by taking remaining slag operation, continuous casting casting residue application, less-slag melting, smelting process constant pressure becomes rifle operation, the minimum rifle position of converter one presses rifle operation, the techniques such as whole wash heat of tapping simultaneously integrated innovation, it increases hot metal containing low silicon and smelts slagging constituent element and origin of heat, promote smelting process rapid slagging slugging, it optimizes and smelts kinetics and thermodynamic condition, obtain good dephosphorization, desulfurization effect, avoid smelting process molten steel and clinker splash, (MnO) distribution concentration is effectively increased in slag, promote smelting Refine the reduction of (MnO) in mid-term slag, reduce the re-oxidation for smelting Mn in later period molten steel, and then significantly improve the residual Mn content (0.25-0.38wt%) of endpoint molten steel, deoxidation alloying process Mn series alloy additional amount is greatly reduced, steel-smelting alloy consumption and alloying cost are significantly reduced, product competitiveness in the market is improved.
Description
Technical field
The invention belongs to Ferrous Metallurgy process for making technical fields, and in particular to the high ferrophosphorus of the low silicon of manganese in a kind of converter smelting
Water proposes the preparation method that carbon protects manganese.
Background technique
Manganese (Mn) element is the beneficial element in steel, with the continuous progress of converting process, iron in converter steelmaking process
The exhausted major part of Mn in water is oxidized, and the residual Mn content of smelting endpoint molten steel is lower, cause deoxidation alloying Mn system's cost of alloy compared with
It is high.Mn of the Mn content of converter smelting endpoint molten steel in molten iron, in converting process, in metal bath, slag and oxygen
The oxidation and reduction reaction of manganese occur between gas, residual Mn content of the final residue in converter terminal molten steel is whole by the quantity of slag, converter
The influence of the point factors such as molten steel and slag beneficiation, converter terminal temperature.By Optimization of LD Smelting Technology, converter terminal is improved
The residual Mn content of molten steel, it is possible to reduce the consumption of deoxidation alloying Mn series alloy after furnace reduces steelmaking alloy cost, improves product
The market competitiveness.
Steel mill of country converter smelting mostly uses greatly Mn content≤0.60wt% molten iron smelting at present, due to molten iron Mn content
It is lower, along with (MnO) reduction effect is bad in smelting process slag, lead to the residual Mn of endpoint molten steel lower (≤0.12wt%), deoxidation
Mn series alloy additional amount is more in alloying process, alloy consumption and alloying higher cost.In recent years, domestic a small number of steel mills open
The research of technique work for improving molten iron Mn content has been opened up, by sintering process with addition of the expensive husky mine of a certain proportion of high manganese, has been produced
Have molten iron C 4.2-4.8wt%, Mn0.70-0.90wt%, Si 0.06-0.15wt%, the P 0.130- of following chemical components
0.220wt%, S≤0.045wt%, remaining be Fe and inevitable impurity, converter smelting is using the low silicon high phosphorus of manganese among the above
How molten iron smelting is innovated smelting process, and the residual Mn content of endpoint molten steel is utmostly improved, and reduces deoxidation alloying mistake
Mn series alloy additional amount in journey, reducing STEELMAKING PRODUCTION cost is just particularly important and urgently.Steel mill of country converter smelting at present
Substantially all using low Mn, the low P with following chemical components (Mn≤0.60wt%, Si0.30-0.55wt%, P≤0.100wt%)
Molten iron smelting, it is domestic to there is certain research to report the converter smelting process of above-mentioned hot metal composition, but to using the low silicon of middle manganese high
Ferrophosphorus water converter smelting, which mentions carbon, which protects preparation of manganese, does not have correlative study report.For above situation, it is necessary to invent a kind of converter smelting
The low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in refining.
Summary of the invention
The purpose of the present invention is to provide a kind of low silicon high phosphorus hot metals of manganese in converter smelting to propose the preparation method that carbon protects manganese.
The object of the present invention is achieved like this, comprises the following steps that:
A, smelt and be packed into technique: upper furnace steel tapping retains whole finishing slags in converter after splashing slag, by 3.0-4.0kg/tSteel's
Light dolomite is added to converter in amount；By 110-140kg/tSteelSteel scrap be packed into proportion, steel scraps are added in 50 tons of LD converters；It
930-960kg/t is pressed afterwardsSteelMolten iron be packed into proportion, the low silicon high phosphorus of middle manganese of following temperatures and mass ratio is added in 50 tons of LD converters
Molten iron: molten iron temperature >=1320 DEG C, hot metal composition C 4.2-4.8wt%, Mn0.70-0.90wt%, Si 0.06-0.15wt%, P
0.130-0.220wt%, S≤0.045wt%, remaining is Fe and inevitable impurity；
B, smelting process early period: after the low silicon high phosphorus hot metal of manganese and steel scrap cold burden are packed into 50 tons of LD converters in step A, front and back grate is allowed
Lower oxygen rifle, which is opened, after molten iron is exposed blows, and igniting oxygen pressure is 0.70~0.75MPa, from high hopper by 5.5-7.5kg/ after lighting a fire successfully
tSteelAmount, be added continuous casting casting residue；To 20-100 seconds, oxygen pressed 0.85MPa control for blowing, and oxygen lance position is controlled by 1.3-1.4,
6.0-7.0kg/t is pressed respectivelySteel、5.0-6.0kg/tSteelAmount, regular activated lime and light dolomite slag making is added, by 1.0kg/
tSteelAmount, be added slagging agent；To 100-150 seconds, oxygen pressed 0.85MPa control for blowing, and oxygen lance position is controlled by 1.1-1.2, point
It An not 5.0-6.0kg/tSteel、4.0-5.0kg/tSteelAmount, regular activated lime and light dolomite slag making is added, by 1.0-
2.0kg/tSteelAmount, add slagging agent；Rifle position is improved after blowing to slag from 150 seconds in time to 1.3-1.5m, blowing to 150-
300 seconds, oxygen pressed 0.85MPa control, and control of lance position 1.2-1.5m presses 2.5-3.5kg/t respectivelySteel、4.0-6.0kg/
tSteelAmount, regular activated lime and light dolomite slag making slugging is added；
C, mid-term smelting process: step B molten steel blew to 300-450 seconds, and oxygen presses 0.85MPa control, and control of lance position is
1.3-1.5m by 1.0-2.0kg/tSteelAmount, be added slagging agent；To 450-750 seconds, oxygen pressed 0.85MPa control, oxygen rifle for blowing
Rifle position control is 1.2-1.4m；When blowing was to 750 seconds, oxygen presses 0.85MPa control, and oxygen lance position is down to 1.0m, and pressure rifle position is deep
It carries out proposing the oxygen rifle sampling of falling furnace after blowing 40 seconds, controls 1590~1620 DEG C of the liquid steel temperature of falling furnace；
D, converter smelting latter stage technique: grate continues lower oxygen rifle blowing, blowing to 800 seconds-tapping after the sampling of falling furnace of step C molten steel
Stage, oxygen press 0.85MPa control, and oxygen lance position is controlled by 1.0-1.2m, control terminal tapping liquid steel temperature 1620~1640
℃；
E, converter tapping technique: active lime wash heat, lime adding amount 1.0kg/ is added in ladle bottom before D step molten steel is tapped
tSteel；Tapping process is 10~15NL/min using whole bottom argon blowing technology, argon flow control；It finally can be obtained and mention carbon guarantor's manganese
Smelting molten steel.
Compared with prior art, the invention has the following beneficial effects:
1, the low silicon high phosphorus hot metal of manganese (Mn0.70-0.90wt%, Si 0.06-0.15wt%, P in converter smelting provided by the invention
0.130-0.220wt%, S≤0.045wt%) preparation method that carbon protects manganese is proposed, by taking remaining slag operation, continuous casting casting residue to answer
With, less-slag melting, smelting process constant pressure become rifle operation, the operation of the minimum rifle position of converter one pressure rifle, the tapping whole process techniques such as wash heat
And integrated innovation, it increases hot metal containing low silicon and smelts slagging constituent element and origin of heat, promote smelting process rapid slagging slugging, it is excellent
Change smelting kinetics and thermodynamic condition, obtained good dephosphorization, desulfurization effect, avoids smelting process steel
Water and clinker splash effectively increase in slag (MnO) distribution concentration, promote the reduction for smelting (MnO) in mid-term slag, reduce
The re-oxidation of Mn in later period molten steel is smelted, and then significantly improves the residual Mn content (0.25-0.38wt%) of endpoint molten steel.
2, invention significantly improves the residual Mn content (0.25-0.38wt%) of endpoint molten steel, reduce deoxidation alloying process
Middle Mn series alloy additional amount significantly reduces steel-smelting alloy consumption and alloying cost, promotes smelting technique economic indicator
Improve, improves product competitiveness in the market.
3, the present invention is by being packed into system, oxygen supply technique, slag making slugging technique, temperature process, terminal control to converter smelting
Technique processed and tapping deslagging process integrated innovation, obtain good smelting dephosphorization effect, realize manganese in converter smelting
The carbon that mentions of low silicon high phosphorus hot metal protects manganese, endpoint molten steel C content >=0.10wt%, residual Mn content 0.25-0.38wt%.
Specific embodiment
Below with reference to embodiment, the present invention is further illustrated, but the present invention is limited in any way,
Based on present invention teach that it is made it is any transform or replace, all belong to the scope of protection of the present invention.
The low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese, including following technique step in converter smelting of the present invention
It is rapid:
A, smelt and be packed into technique: upper furnace steel tapping retains whole finishing slags in converter after splashing slag, by 3.0-4.0kg/tSteel's
Light dolomite is added to converter in amount；By 110-140kg/tSteelSteel scrap be packed into proportion, steel scraps are added in 50 tons of LD converters；It
930-960kg/t is pressed afterwardsSteelMolten iron be packed into proportion, the low silicon high phosphorus of middle manganese of following temperatures and mass ratio is added in 50 tons of LD converters
Molten iron: molten iron temperature >=1320 DEG C, hot metal composition C 4.2-4.8wt%, Mn0.70-0.90wt%, Si 0.06-0.15wt%, P
0.130-0.220wt%, S≤0.045wt%, remaining is Fe and inevitable impurity；
B, smelting process early period: after the low silicon high phosphorus hot metal of manganese and steel scrap cold burden are packed into 50 tons of LD converters in step A, front and back grate is allowed
Lower oxygen rifle, which is opened, after molten iron is exposed blows, and igniting oxygen pressure is 0.70~0.75MPa, from high hopper by 5.5-7.5kg/ after lighting a fire successfully
tSteelAmount, be added continuous casting casting residue；To 20-100 seconds, oxygen pressed 0.85MPa control for blowing, and oxygen lance position is controlled by 1.3-1.4,
6.0-7.0kg/t is pressed respectivelySteel、5.0-6.0kg/tSteelAmount, regular activated lime and light dolomite slag making is added, by 1.0kg/
tSteelAmount, be added slagging agent；To 100-150 seconds, oxygen pressed 0.85MPa control for blowing, and oxygen lance position is controlled by 1.1-1.2, point
It An not 5.0-6.0kg/tSteel、4.0-5.0kg/tSteelAmount, regular activated lime and light dolomite slag making is added, by 1.0-
2.0kg/tSteelAmount, add slagging agent；Rifle position is improved after blowing to slag from 150 seconds in time to 1.3-1.5m, blowing to 150-
300 seconds, oxygen pressed 0.85MPa control, and control of lance position 1.2-1.5m presses 2.5-3.5kg/t respectivelySteel、4.0-6.0kg/
tSteelAmount, regular activated lime and light dolomite slag making slugging is added；
C, mid-term smelting process: step B molten steel blew to 300-450 seconds, and oxygen presses 0.85MPa control, and control of lance position is
1.3-1.5m by 1.0-2.0kg/tSteelAmount, be added slagging agent；To 450-750 seconds, oxygen pressed 0.85MPa control, oxygen rifle for blowing
Rifle position control is 1.2-1.4m；When blowing was to 750 seconds, oxygen presses 0.85MPa control, and oxygen lance position is down to 1.0m, and pressure rifle position is deep
It carries out proposing the oxygen rifle sampling of falling furnace after blowing 40 seconds, controls 1590~1620 DEG C of the liquid steel temperature of falling furnace；
D, converter smelting latter stage technique: grate continues lower oxygen rifle blowing, blowing to 800 seconds-tapping after the sampling of falling furnace of step C molten steel
Stage, oxygen press 0.85MPa control, and oxygen lance position is controlled by 1.0-1.2m, control terminal tapping liquid steel temperature 1620~1640
℃；
E, converter tapping technique: active lime wash heat, lime adding amount 1.0kg/ is added in ladle bottom before D step molten steel is tapped
tSteel；Tapping process is 10~15NL/min using whole bottom argon blowing technology, argon flow control；It finally can be obtained and mention carbon guarantor's manganese
Smelting molten steel.
Steel scrap described in step A includes the ingredient of following weight ratio: C 0.22-0.26wt%, Si 0.40-0.58wt%,
Mn 1.20-1.50wt%, P 0.025-0.040wt%, S 0.018-0.032wt%, remaining for Fe and inevitably it is impure
Object；
Continuous casting casting residue described in step B includes the ingredient of following weight ratio: CaO 10.0-12.0%, SiO2 36.0-
38.0%, MgO 6.8-8.2%, Al2O3 4.2-5.0%, TFe 1.4-2.5%, MnO 8.2-9.2%, S 0.10-0.18%, P
0.045-0.065%, remaining is Fe and inevitable impurity；
The slagging agent includes the ingredient of following weight ratio: CaO 21.5%, Al2O3 7.6%, FeO 14.6%, Fe2O3
29.5%, MnO 5.4%, S 0.15%, remaining is Fe and inevitable impurity；
The component requirements of the molten steel of falling furnace described in step C be 0.15~0.25wt% of C, Mn 0.32-0.48wt%, P≤
0.030wt%、S≤0.030%。
Terminal described in step D tap molten steel component requirements be 0.10~0.17wt% of C, P≤0.027wt%,
Mn0.25-0.38wt%、S≤0.028wt%。
Mentioned described in step E carbon protect manganese smelting molten steel have following weight percents ingredient: C 0.10~
0.17wt%, P≤0.027wt%, Mn0.25-0.38wt%, S≤0.025wt%, remaining is Fe and inevitable impurity.
Embodiment 1
The low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in a kind of converter smelting, comprises the following steps that:
A, smelt and be packed into technique: upper furnace steel tapping retains whole finishing slags in converter after splashing slag, by 3.0kg/tSteelAmount, to
Light dolomite is added in converter；By 110kg/tSteelSteel scrap be packed into proportion, the steel scrap of following mass ratio is added in 50 tons of LD converters:
C 0.22wt%, Si 0.40wt%, Mn 1.20wt%, P 0.025wt%, S 0.018wt%, remaining for Fe and inevitably not
Pure object；960kg/t is pressed laterSteelMolten iron be packed into proportion, the low silicon of middle manganese of following temperatures and mass ratio is added in 50 tons of LD converters
High phosphorus hot metal: 1320 DEG C of molten iron temperature, hot metal composition C 4.2wt%, Mn0.70wt%, Si 0.06wt%, P 0.130wt%, S
0.025wt%, remaining is Fe and inevitable impurity.
B, it smelting process early period: after the low silicon high phosphorus hot metal of manganese and steel scrap cold burden are packed into 50 tons of LD converters in step A, rocks back and forth
Furnace is opened by the exposed rear lower oxygen rifle of molten iron to be blown, and igniting oxygen pressure is 0.70~0.75MPa, from high hopper by 5.5kg/ after lighting a fire successfully
tSteelAmount, the continuous casting casting residue of following mass ratio: CaO 10.0%, SiO is added236.0%, MgO 6.8%, Al2O3 4.2%,
TFe 1.4%, MnO 8.2%, S 0.10%, P 0.045%, remaining is Fe and inevitable impurity；It blows to 20-100
Second, oxygen presses 0.85MPa control, and oxygen lance position is controlled by 1.3-1.4, presses 6.0kg/t respectivelySteel、5.0kg/tSteelAmount, be added normal
Active lime and light dolomite slag making are advised, by 1.0kg/tSteelAmount, the slagging agent of following mass ratio: CaO 21.5% is added,
Al2O3 7.6%, FeO 14.6%, Fe2O3 29.5%, MnO 5.4%, S 0.15%, remaining is Fe and inevitable impurity；
To 100-150 seconds, oxygen pressed 0.85MPa control for blowing, and oxygen lance position is controlled by 1.1-1.2, presses 5.0kg/t respectivelySteel、4.0kg/
tSteelAmount, regular activated lime and light dolomite slag making is added, by 1.0kg/tSteelAmount, the slugging of following mass ratio is added
Agent: CaO 21.5%, Al2O3 7.6%, FeO 14.6%, Fe2O3 29.5%, MnO 5.4%, S 0.15%, remaining is Fe and can not
The impurity avoided；Rifle position is improved after blowing to slag from 150 seconds in time to 1.3-1.5m, is blown to 150-300 seconds, oxygen presses
0.85MPa control, control of lance position 1.2-1.5m press 2.5kg/t respectivelySteel、4.0kg/tSteelAmount, regular activated stone is added
Ash and light dolomite slag making slugging.
C, mid-term smelting process: step B molten steel blew to 300-450 seconds, and oxygen presses 0.85MPa control, oxygen lance position control
It is made as 1.3-1.5m, by 1.0kg/tSteelAmount, the slagging agent of following mass ratio: CaO 21.5%, Al is added2O3 7.6%, FeO
14.6%, Fe2O3 29.5%, MnO 5.4%, S 0.15%, remaining is Fe and inevitable impurity；It blows to 450-750
Second, oxygen presses 0.85MPa control, control of lance position 1.2-1.4m；When blowing was to 750 seconds, oxygen presses 0.85MPa control,
Oxygen lance position is down to 1.0m, and pressure rifle position carries out proposing the oxygen rifle sampling of falling furnace after blowing deeply 40 seconds, and the molten steel of falling furnace control requires: temperature 1590
℃、C 0.15wt%、Mn 0.32wt%、P 0.023wt%、S 0.020%。
D, converter smelting latter stage technique: grate continues the blowing of lower oxygen rifle after the sampling of falling furnace of step C molten steel, blowing to 800 seconds-
Tapping stage, oxygen press 0.85MPa control, and oxygen lance position is controlled by 1.0-1.2m, and terminal tapping molten steel control requires: temperature
1620℃、C 0.10 wt%、P 0.021wt%、Mn0.25wt%、S0.018wt%。
E, converter tapping technique: active lime wash heat is added in ladle bottom before D step molten steel is tapped, and lime adding amount is
1.0kg/tSteel；Tapping process is 10NL/min using whole bottom argon blowing technology, argon flow control；Finally obtain with following
The molten steel of weight percent: C 0.10wt%, P0.022wt%, Mn0.25wt%, S0.016wt%, remaining is for Fe and inevitably
Impurity.
Embodiment 2
The low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in a kind of converter smelting, comprises the following steps that:
A, smelt and be packed into technique: upper furnace steel tapping retains whole finishing slags in converter after splashing slag, by 3.5kg/tSteelAmount, to
Light dolomite is added in converter；By 125kg/tSteelSteel scrap be packed into proportion, the steel scrap of following mass ratio is added in 50 tons of LD converters:
C 0.24wt%, Si 0.49wt%, Mn 1.35wt%, P 0.032wt%, S 0.025wt%, remaining for Fe and inevitably not
Pure object；945kg/t is pressed laterSteelMolten iron be packed into proportion, the low silicon of middle manganese of following temperatures and mass ratio is added in 50 tons of LD converters
High phosphorus hot metal: 1335 DEG C of molten iron temperature, hot metal composition C 4.5wt%, Mn0.80wt%, Si 0.10wt%, P 0.175wt%, S
0.038wt%, remaining is Fe and inevitable impurity.
B, it smelting process early period: after the low silicon high phosphorus hot metal of manganese and steel scrap cold burden are packed into 50 tons of LD converters in step A, rocks back and forth
Furnace is opened by the exposed rear lower oxygen rifle of molten iron to be blown, and igniting oxygen pressure is 0.70~0.75MPa, from high hopper by 6.5kg/ after lighting a fire successfully
tSteelAmount, the continuous casting casting residue of following mass ratio: CaO 10.0-12.0%, SiO is added236.0-38.0%, MgO 6.8-
8.2%, Al2O3 4.2-5.0%, TFe 1.4-2.5%, MnO 8.2-9.2%, S 0.10-0.18%, P 0.045-0.065%,
Remaining is Fe and inevitable impurity；To 20-100 seconds, oxygen pressed 0.85MPa control for blowing, and oxygen lance position is controlled by 1.3-1.4
System presses 6.5kg/t respectivelySteel、5.5kg/tSteelAmount, regular activated lime and light dolomite slag making is added, by 1.0kg/tSteel's
Amount, is added the slagging agent of following mass ratio: CaO 21.5%, Al2O3 7.6%, FeO 14.6%, Fe2O3 29.5%, MnO 5.4%,
S 0.15%, remaining is Fe and inevitable impurity；To 100-150 seconds, oxygen pressed 0.85MPa control, oxygen lance position for blowing
It is controlled by 1.1-1.2, presses 5.5kg/t respectivelySteel、4.5kg/tSteelAmount, regular activated lime and light dolomite slag making is added, presses
1.5kg/tSteelAmount, the slagging agent of following mass ratio: CaO 21.5%, Al is added2O3 7.6%, FeO 14.6%, Fe2O3
29.5%, MnO 5.4%, S 0.15%, remaining is Fe and inevitable impurity；Rifle is improved in time after blowing to slag from 150 seconds
1.3-1.5m is arrived in position, blows to 150-300 seconds, oxygen presses 0.85MPa control, and control of lance position 1.2-1.5m is pressed respectively
3.0kg/tSteel、5.0kg/tSteelAmount, regular activated lime and light dolomite slag making slugging is added.
C, mid-term smelting process: step B molten steel blew to 300-450 seconds, and oxygen presses 0.85MPa control, oxygen lance position control
It is made as 1.3-1.5m, by 1.5kg/tSteelAmount, the slagging agent of following mass ratio: CaO 21.5%, Al is added2O3 7.6%, FeO
14.6%, Fe2O3 29.5%, MnO 5.4%, S 0.15%, remaining is Fe and inevitable impurity；It blows to 450-750
Second, oxygen presses 0.85MPa control, control of lance position 1.2-1.4m；When blowing was to 750 seconds, oxygen presses 0.85MPa control,
Oxygen lance position is down to 1.0m, and pressure rifle position carries out proposing the oxygen rifle sampling of falling furnace after blowing deeply 40 seconds, and the molten steel of falling furnace control requires: temperature 1605
℃、C 0.20wt%、Mn 0.40 wt%、P 0.026wt%、S 0.023%。
D, converter smelting latter stage technique: grate continues the blowing of lower oxygen rifle after the sampling of falling furnace of step C molten steel, blowing to 800 seconds-
Tapping stage, oxygen press 0.85MPa control, and oxygen lance position is controlled by 1.0-1.2m, and terminal tapping molten steel control requires: temperature
1630℃、C 0.14wt%、P 0.024wt%、Mn0.32 wt%、S 0.021wt%。
E, converter tapping technique: active lime wash heat is added in ladle bottom before D step molten steel is tapped, and lime adding amount is
1.0kg/tSteel；Tapping process is 15NL/min using whole bottom argon blowing technology, argon flow control；Finally obtain with following
The molten steel of weight percent: C 0.14wt%, P 0.024wt%, Mn0.32wt%, S0.019wt%, remaining is for Fe and unavoidably
Impurity.
Embodiment 3
The low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in a kind of converter smelting, comprises the following steps that:
A, smelt and be packed into technique: upper furnace steel tapping retains whole finishing slags in converter after splashing slag, by 4.0kg/tSteelAmount, to
Light dolomite is added in converter；By 140kg/tSteelSteel scrap be packed into proportion, the steel scrap of following mass ratio is added in 50 tons of LD converters:
C 0.26wt%, Si 0.58wt%, Mn 1.50wt%, P 0.040wt%, S 0.032wt%, remaining for Fe and inevitably not
Pure object；930kg/t is pressed laterSteelMolten iron be packed into proportion, the low silicon of middle manganese of following temperatures and mass ratio is added in 50 tons of LD converters
High phosphorus hot metal: 1350 DEG C of molten iron temperature, hot metal composition C 4.8wt%, Mn0.90wt%, Si 0.15wt%, P 0.220wt%,
S0.045wt%, remaining is Fe and inevitable impurity.
B, it smelting process early period: after the low silicon high phosphorus hot metal of manganese and steel scrap cold burden are packed into 50 tons of LD converters in step A, rocks back and forth
Furnace is opened by the exposed rear lower oxygen rifle of molten iron to be blown, and igniting oxygen pressure is 0.70~0.75MPa, from high hopper by 7.5kg/ after lighting a fire successfully
tSteelAmount, the continuous casting casting residue of following mass ratio: CaO 12.0%, SiO is added238.0%, MgO 8.2%, Al2O3 5.0%,
TFe 2.5%, MnO 9.2%, S 0.18%, P 0.065%, remaining is Fe and inevitable impurity；It blows to 20-100
Second, oxygen presses 0.85MPa control, and oxygen lance position is controlled by 1.3-1.4, presses 7.0kg/t respectivelySteel、6.0kg/tSteelAmount, be added normal
Active lime and light dolomite slag making are advised, by 1.0kg/tSteelAmount, the slagging agent of following mass ratio: CaO 21.5% is added,
Al2O3 7.6%, FeO 14.6%, Fe2O3 29.5%, MnO 5.4%, S 0.15%, remaining is Fe and inevitable impurity；
To 100-150 seconds, oxygen pressed 0.85MPa control for blowing, and oxygen lance position is controlled by 1.1-1.2, presses 6.0kg/t respectivelySteel、5.0kg/
tSteelAmount, regular activated lime and light dolomite slag making is added, by 2.0kg/tSteelAmount, the slugging of following mass ratio is added
Agent: CaO 21.5%, Al2O3 7.6%, FeO 14.6%, Fe2O3 29.5%, MnO 5.4%, S 0.15%, remaining is Fe and can not
The impurity avoided；Rifle position is improved after blowing to slag from 150 seconds in time to 1.3-1.5m, is blown to 150-300 seconds, oxygen presses
0.85MPa control, control of lance position 1.2-1.5m press 3.5kg/t respectivelySteel、6.0kg/tSteelAmount, regular activated stone is added
Ash and light dolomite slag making slugging.
C, mid-term smelting process: step B molten steel blew to 300-450 seconds, and oxygen presses 0.85MPa control, oxygen lance position control
It is made as 1.3-1.5m, by 2.0kg/tSteelAmount, the slagging agent of following mass ratio: CaO 21.5%, Al is added2O3 7.6%, FeO
14.6%, Fe2O3 29.5%, MnO 5.4%, S 0.15%, remaining is Fe and inevitable impurity；It blows to 450-750
Second, oxygen presses 0.85MPa control, control of lance position 1.2-1.4m；When blowing was to 750 seconds, oxygen presses 0.85MPa control,
Oxygen lance position is down to 1.0m, and pressure rifle position carries out proposing the oxygen rifle sampling of falling furnace after blowing deeply 40 seconds, and the molten steel of falling furnace control requires: temperature 1620
℃、C 0.25wt%、Mn 0.48wt%、P0.030wt%、S0.030%。
D, converter smelting latter stage technique: grate continues the blowing of lower oxygen rifle after the sampling of falling furnace of step C molten steel, blowing to 800 seconds-
Tapping stage, oxygen press 0.85MPa control, and oxygen lance position is controlled by 1.0-1.2m, and terminal tapping molten steel control requires: temperature
1640℃、C0.17wt%、P0.027wt%、Mn0.38wt%、S0.028wt%。
E, converter tapping technique: active lime wash heat is added in ladle bottom before D step molten steel is tapped, and lime adding amount is
1.0kg/tSteel；Tapping process is 15NL/min using whole bottom argon blowing technology, argon flow control；Finally obtain with following
The molten steel of weight percent: C 0.17wt%, P0.027wt%, Mn0.38wt%, S0.025wt%, remaining is for Fe and inevitably
Impurity.
Claims (7)
1. the low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in a kind of converter smelting, it is characterised in that walked including following technique
It is rapid:
A, smelt and be packed into technique: upper furnace steel tapping retains whole finishing slags in converter after splashing slag, by 3.0-4.0kg/tSteel's
Light dolomite is added to converter in amount；By 110-140kg/tSteelSteel scrap be packed into proportion, steel scraps are added in 50 tons of LD converters；It
930-960kg/t is pressed afterwardsSteelMolten iron be packed into proportion, the low silicon high phosphorus of middle manganese of following temperatures and mass ratio is added in 50 tons of LD converters
Molten iron: molten iron temperature >=1320 DEG C, hot metal composition C 4.2-4.8wt%, Mn0.70-0.90wt%, Si 0.06-0.15wt%, P
0.130-0.220wt%, S≤0.045wt%, remaining is Fe and inevitable impurity；
B, smelting process early period: after the low silicon high phosphorus hot metal of manganese and steel scrap cold burden are packed into 50 tons of LD converters in step A, front and back grate is allowed
Lower oxygen rifle, which is opened, after molten iron is exposed blows, and igniting oxygen pressure is 0.70~0.75MPa, from high hopper by 5.5-7.5kg/ after lighting a fire successfully
tSteelAmount, be added continuous casting casting residue；To 20-100 seconds, oxygen pressed 0.85MPa control for blowing, and oxygen lance position is controlled by 1.3-1.4,
6.0-7.0kg/t is pressed respectivelySteel、5.0-6.0kg/tSteelAmount, regular activated lime and light dolomite slag making is added, by 1.0kg/
tSteelAmount, be added slagging agent；To 100-150 seconds, oxygen pressed 0.85MPa control for blowing, and oxygen lance position is controlled by 1.1-1.2, point
It An not 5.0-6.0kg/tSteel、4.0-5.0kg/tSteelAmount, regular activated lime and light dolomite slag making is added, by 1.0-
2.0kg/tSteelAmount, add slagging agent；Rifle position is improved after blowing to slag from 150 seconds in time to 1.3-1.5m, blowing to 150-
300 seconds, oxygen pressed 0.85MPa control, and control of lance position 1.2-1.5m presses 2.5-3.5kg/t respectivelySteel、4.0-6.0kg/
tSteelAmount, regular activated lime and light dolomite slag making slugging is added；
C, mid-term smelting process: step B molten steel blew to 300-450 seconds, and oxygen presses 0.85MPa control, and control of lance position is
1.3-1.5m by 1.0-2.0kg/tSteelAmount, be added slagging agent；To 450-750 seconds, oxygen pressed 0.85MPa control, oxygen rifle for blowing
Rifle position control is 1.2-1.4m；When blowing was to 750 seconds, oxygen presses 0.85MPa control, and oxygen lance position is down to 1.0m, and pressure rifle position is deep
It carries out proposing the oxygen rifle sampling of falling furnace after blowing 40 seconds, controls 1590~1620 DEG C of the liquid steel temperature of falling furnace；
D, converter smelting latter stage technique: grate continues lower oxygen rifle blowing, blowing to 800 seconds-tapping after the sampling of falling furnace of step C molten steel
Stage, oxygen press 0.85MPa control, and oxygen lance position is controlled by 1.0-1.2m, control terminal tapping liquid steel temperature 1620~1640
℃；
E, converter tapping technique: active lime wash heat, lime adding amount 1.0kg/ is added in ladle bottom before D step molten steel is tapped
tSteel；Tapping process is 10~15NL/min using whole bottom argon blowing technology, argon flow control；It finally can be obtained and mention carbon guarantor's manganese
Smelting molten steel.
2. the low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in converter smelting according to claim 1, feature exists
The steel scrap described in step A includes the ingredient of following weight ratio: C 0.22-0.26wt%, Si 0.40-0.58wt%, Mn
1.20-1.50wt%, P 0.025-0.040wt%, S 0.018-0.032wt%, remaining is Fe and inevitable impurity.
3. the low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in converter smelting according to claim 1, feature exists
The continuous casting casting residue described in step B includes the ingredient of following weight ratio: CaO 10.0-12.0%, SiO236.0-38.0%,
MgO 6.8-8.2%, Al2O3 4.2-5.0%, TFe 1.4-2.5%, MnO 8.2-9.2%, S 0.10-0.18%, P 0.045-
0.065%, remaining is Fe and inevitable impurity.
4. the low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in converter smelting according to claim 1, feature exists
In the ingredient that the slagging agent includes following weight ratio: CaO 21.5%, Al2O3 7.6%, FeO 14.6%, Fe2O3 29.5%,
MnO 5.4%, S 0.15%, remaining is Fe and inevitable impurity.
5. the low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in converter smelting according to claim 1, feature exists
The component requirements of the molten steel of falling furnace described in step C be 0.15~0.25wt% of C, Mn 0.32-0.48wt%, P≤
0.030wt%、S≤0.030%。
6. the low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in converter smelting according to claim 1, feature exists
The component requirements of the tapping molten steel of the terminal described in step D are 0.10~0.17wt% of C, P≤0.027wt%, Mn0.25-
0.38wt%、S≤0.028wt%。
7. the low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in converter smelting according to claim 1, feature exists
The smelting molten steel that carbon protects manganese is mentioned described in the step E has the ingredients of following weight percents: 0.10~0.17wt% of C, P≤
0.027wt%, Mn0.25-0.38wt%, S≤0.025wt%, remaining is Fe and inevitable impurity.
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| CN112322822A (en) * | 2020-10-16 | 2021-02-05 | 包头钢铁（集团）有限责任公司 | Converter single slag smelting method for low-silicon high-phosphorus molten iron |
| CN114410878A (en) * | 2021-12-23 | 2022-04-29 | 武钢集团昆明钢铁股份有限公司 | Converter molten iron smelting method adopting large-particle limestone instead of full-amount lime for slagging |
| CN114480774A (en) * | 2021-12-23 | 2022-05-13 | 武钢集团昆明钢铁股份有限公司 | Method for smelting high-phosphorus molten iron by adopting limestone slagging process in converter |
| CN114480775A (en) * | 2021-12-23 | 2022-05-13 | 武钢集团昆明钢铁股份有限公司 | Low-cost converter smelting process for slagging by limestone and raw dolomite |
| CN114934149A (en) * | 2022-06-08 | 2022-08-23 | 中天钢铁集团有限公司 | Method for recycling steelmaking solid waste |
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