CN109097521A - A kind of low silicon high phosphorus hot metal of the high manganese of converter smelting proposes the preparation method that carbon protects manganese - Google Patents

A kind of low silicon high phosphorus hot metal of the high manganese of converter smelting proposes the preparation method that carbon protects manganese Download PDF

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CN109097521A
CN109097521A CN201811154708.7A CN201811154708A CN109097521A CN 109097521 A CN109097521 A CN 109097521A CN 201811154708 A CN201811154708 A CN 201811154708A CN 109097521 A CN109097521 A CN 109097521A
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steel
manganese
oxygen
added
control
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CN109097521B (en
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陈伟
张卫强
陈必胜
杨春雷
赵卫东
肖国昆
苏华林
张瑜
金安林
王崎军
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Wuhan Iron and Steel Group Kunming Iron and Steel Co Ltd
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Wuhan Iron and Steel Group Kunming Iron and Steel Co Ltd
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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
    • 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
    • C21C5/36—Processes yielding slags of special composition
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

Carbon, which is mentioned, the invention discloses a kind of low silicon high phosphorus hot metal of the high manganese of converter smelting protects manganese (Mn1.20-1.50wt%, Si≤0.20wt%, P 0.130-0.180wt%) preparation method, this method is by taking remaining slag operation, less-slag melting, smelting process constant pressure becomes rifle operation, the minimum rifle position of converter one presses rifle operation, techniques and the integrated innovation such as tapping process wash heat and whole BOTTOM ARGON BLOWING, 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 the reduction for smelting (MnO) in mid-term slag, reduce the re-oxidation for smelting Mn in later period molten steel, significantly improve the residual Mn content (0.40 of endpoint molten steel - 0.60wt%), deoxidation alloying process Mn series alloy additional amount is greatly reduced, significantly reduces steel-smelting alloy consumption and alloying cost, improves the steel product market competitiveness.

Description

A kind of low silicon high phosphorus hot metal of the high manganese of converter smelting proposes the preparation method that carbon protects manganese
Technical field
The invention belongs to Ferrous Metallurgy process for making technical fields, and in particular to a kind of low high ferrophosphorus of silicon of the high manganese 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 advantageously reduces STEELMAKING PRODUCTION cost, improves The steel product 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 Lower to cause the residual Mn of endpoint molten steel lower (≤0.15wt%), Mn series alloy additional amount is more during deoxidation alloying, and alloy disappears Consumption and alloying higher cost.In recent years, domestic a small number of steel mills have carried out the research of technique work for improving molten iron Mn content, pass through For sintering process with addition of the expensive husky mine of high manganese at high proportion, the molten iron of following chemical components is provided in production: Mn 1.20-1.50wt%, Si≤ 0.20wt%, P 0.130-0.180wt%, S≤0.040wt%, converter smelting use the low silicon high phosphorus hot metal of above-mentioned high manganese to smelt, such as What utmostly improves the residual Mn content of endpoint molten steel, reduces Mn series alloy additional amount during deoxidation alloying, reduces steel-making life Producing cost is just particularly important and urgently.Steel mill of country converter smelting is substantially all using with following chemical components (Mn at present ≤ 0.60wt%, Si 0.30-0.55wt%, P≤0.100wt%) low Mn, low P molten iron smelting, the country to above-mentioned hot metal composition Converter smelting process has certain research report, but does not have to using the low silicon high phosphorus hot metal converter smelting of high manganese to mention carbon guarantor's preparation of manganese Correlative study and report.In view of the above problems, it is necessary to send out
A kind of low silicon high phosphorus hot metal of the bright high manganese of converter smelting proposes the preparation method that carbon protects manganese.
Summary of the invention
The purpose of the present invention is to provide a kind of low silicon high phosphorus hot metals of the high manganese of 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 4.0kg/tSteelAmount, to Light dolomite is added in converter；By 115-145kg/tSteelSteel scrap be packed into proportion, steel scraps are added in 50 tons of LD converters；By 930- 960kg/tSteelMolten iron be packed into proportion, the low silicon high phosphorus hot metal of high manganese of following temperatures and mass ratio: iron is added in 50 tons of LD converters Coolant-temperature gage >=1310 DEG C, hot metal composition C 4.2-4.8wt%, Si 0.10-0.20wt%, Mn 1.20-1.50wt%, P 0.130-0.180wt%, S≤0.040wt%, remaining is Fe and inevitable impurity；
B, smelting process early period: after the low silicon high phosphorus hot metal of the high manganese of step A and steel scrap cold burden 50 tons of LD converters of loading, front and back grate is allowed Lower oxygen rifle, which is opened, after molten iron is exposed blows, and igniting oxygen pressure is 0.75~0.80MPa；From high hopper by 3.0kg/t after lighting a fire successfullySteel's Slag former is added in amount；It opens and is blown to 20 seconds, oxygen presses 0.80MPa control, and oxygen lance position is controlled by 1.5m, presses 2.7- respectively 3.5kg/tSteel、3.0-3.4kg/tSteelAmount, regular activated lime and light dolomite slag making is added, by 1.0kg/tSteelAmount, add Enter slagging agent；Blowing was to 20-80 seconds, and oxygen presses 0.80MPa control, and oxygen lance position is down to 0.9m, pressed 2.5-3.2kg/t respectivelySteel、 2.5-3.5kg/tSteel、2.7-3.5kg/tSteelAmount, regular activated lime, light dolomite, magnesite ball slag making is added, by 1.5kg/ tSteelAmount, add slagging agent；To 80-300 seconds, oxygen pressed 0.80MPa control, control of lance position 1.0m, difference for blowing By 5.5-6.5kg/tSteel、5.0-5.5kg/tSteelAmount, regular activated lime, light dolomite slag making slugging is added；
C, mid-term smelting process: step B molten steel blew to 300-400 seconds, and oxygen presses 0.80MPa control, and control of lance position is 1.1m, by 0.8-3.0kg/tSteelAmount, regular activated lime is added；By 0.8-1.6kg/tSteelAmount, be added slagging agent；Blowing is extremely 400-700 seconds, oxygen pressed 0.80MPa control, control of lance position 1.2m, and presses 0.8-1.5 kg/tSteelAmount be added it is conventional Iron ore coolant；To 700-750 seconds, oxygen pressed 0.85MPa control for blowing, and oxygen lance position is down to 0.8m, and pressure rifle position blows 25- deeply The sampling of falling furnace is carried out after 30 seconds, controls 1615~1640 DEG C of the liquid steel temperature of falling furnace；
D, converter smelting latter stage technique: grate continues lower oxygen rifle blowing, blowing to 780 seconds-terminal after the sampling of falling furnace of step C molten steel Tapping stage, oxygen press 0.85MPa control, and oxygen lance position is controlled by 0.8-0.9m, and control terminal tapping liquid steel temperature 1640~ 1670℃；
E, converter tapping technique: active lime wash heat, lime adding amount 1.0- is added in ladle bottom before D step molten steel is tapped 2.0kg/tSteel；Tapping process is 15~20NL/min using whole bottom argon blowing technology, argon flow control；It finally can be obtained and mention The smelting molten steel of carbon guarantor's manganese.
Compared with prior art, beneficial effects of the present invention:
1, the high manganese of converter smelting provided by the invention low silicon high phosphorus hot metal (Mn1.20-1.50wt%, Si≤0.20wt%, P 0.130-0.180wt%, S≤0.040wt%) preparation method that carbon protects manganese is proposed, by taking remaining slag operation, less-slag melting, smelting Constant pressure becomes techniques and the integrated innovations such as rifle operation, the operation of the minimum rifle position of converter one pressure rifle, tapping wash heat and whole BOTTOM ARGON BLOWING, excellent Change smelting kinetics and thermodynamic condition, obtained good dephosphorization, desulfurization effect, avoids smelting process steel Water and clinker splash significantly improve in slag (MnO) distribution concentration, promote the reduction for smelting (MnO) in mid-term slag, reduce The re-oxidation for smelting Mn in later period molten steel, finally significantly improves the residual Mn content (0.40-0.60wt%) of endpoint molten steel.
2, invention significantly improves the residual Mn contents of endpoint molten steel, and Mn series alloy is added during reducing deoxidation alloying Amount, significantly reduces steelmaking alloy cost, promotes the improvement of smelting technique economic indicator, improve steel product market competition Power.
3, the present invention is by staying slag technique to converter smelting, being packed into technique, oxygen supply technique, slagging process, temperature process, end Point control technique and tapping deslagging process integrated innovation, obtain good smelting dephosphorization, desulfurization effect, realize converter The carbon that mentions for smelting the low silicon high phosphorus hot metal of high manganese protects manganese, endpoint molten steel C content >=0.09wt%, residual Mn content 0.40-0.60wt%.
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 the high manganese of converter smelting of the present invention proposes the preparation method that carbon protects manganese, including following technique step It is rapid:
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 115-145kg/tSteelSteel scrap be packed into proportion, steel scraps are added in 50 tons of LD converters；By 930- 960kg/tSteelMolten iron be packed into proportion, the low silicon high phosphorus hot metal of high manganese of following temperatures and mass ratio: iron is added in 50 tons of LD converters Coolant-temperature gage >=1310 DEG C, hot metal composition C 4.2-4.8wt%, Si 0.10-0.20wt%, Mn 1.20-1.50wt%, P 0.130-0.180wt%, S≤0.040wt%, remaining is Fe and inevitable impurity；
B, smelting process early period: after the low silicon high phosphorus hot metal of the high manganese of step A and steel scrap cold burden 50 tons of LD converters of loading, front and back grate is allowed Lower oxygen rifle, which is opened, after molten iron is exposed blows, and igniting oxygen pressure is 0.75~0.80MPa；From high hopper by 3.0kg/t after lighting a fire successfullySteel's Slag former is added in amount；It opens and is blown to 20 seconds, oxygen presses 0.80MPa control, and oxygen lance position is controlled by 1.5m, presses 2.7- respectively 3.5kg/tSteel、3.0-3.4kg/tSteelAmount, regular activated lime and light dolomite slag making is added, by 1.0kg/tSteelAmount, add Enter slagging agent；Blowing was to 20-80 seconds, and oxygen presses 0.80MPa control, and oxygen lance position is down to 0.9m, pressed 2.5-3.2kg/t respectivelySteel、 2.5-3.5kg/tSteel、2.7-3.5kg/tSteelAmount, regular activated lime, light dolomite, magnesite ball slag making is added, by 1.5kg/ tSteelAmount, add slagging agent；To 80-300 seconds, oxygen pressed 0.80MPa control, control of lance position 1.0m, difference for blowing By 5.5-6.5kg/tSteel、5.0-5.5kg/tSteelAmount, regular activated lime, light dolomite slag making slugging is added；
C, mid-term smelting process: step B molten steel blew to 300-400 seconds, and oxygen presses 0.80MPa control, and control of lance position is 1.1m, by 0.8-3.0kg/tSteelAmount, regular activated lime is added；By 0.8-1.6kg/tSteelAmount, be added slagging agent；Blowing is extremely 400-700 seconds, oxygen pressed 0.80MPa control, control of lance position 1.2m, and presses 0.8-1.5 kg/tSteelAmount be added it is conventional Iron ore coolant；To 700-750 seconds, oxygen pressed 0.85MPa control for blowing, and oxygen lance position is down to 0.8m, and pressure rifle position blows 25- deeply The sampling of falling furnace is carried out after 30 seconds, controls 1615~1640 DEG C of the liquid steel temperature of falling furnace；
D, converter smelting latter stage technique: grate continues lower oxygen rifle blowing, blowing to 780 seconds-terminal after the sampling of falling furnace of step C molten steel Tapping stage, oxygen press 0.85MPa control, and oxygen lance position is controlled by 0.8-0.9m, and control terminal tapping liquid steel temperature 1640~ 1670℃；
E, converter tapping technique: active lime wash heat, lime adding amount 1.0- is added in ladle bottom before D step molten steel is tapped 2.0kg/tSteel；Tapping process is 15~20NL/min using whole bottom argon blowing technology, argon flow control；It finally can be obtained and mention The smelting molten steel of carbon guarantor's manganese.
Steel scrap described in step A includes the ingredient of following mass ratio: C 0.20-0.25wt%, Si 0.30-0.55wt%, Mn 1.15-1.35wt%, P 0.020-0.037wt%, S 0.022-0.036wt%, remaining for Fe and inevitably it is impure Object.
Slag former described in step B includes the ingredient of following mass ratio: CaO 22.5%, SiO226.3%, MgO 18.5%, Al2O3 6.2%, FeO 13.5%, remaining is Fe and inevitable impurity；
The slagging agent includes the ingredient 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.
The component requirements of the molten steel of falling furnace described in step C be C 0.15-0.22wt%, Mn 0.45-0.70wt%, P≤ 0.030wt%、S≤0.030wt%。
The component requirements of the tapping of terminal described in step D are 0.09~0.15wt% of C, P≤0.025wt%, Mn0.40- 0.60wt%、S≤0.028wt%。
Mentioned described in step E carbon protect manganese smelting molten steel have following weight percents ingredient: C 0.09~ 0.15wt%, P≤0.025wt%, Mn0.40-0.60wt%, S≤0.025wt%, remaining is Fe and inevitable impurity.
Embodiment 1
A kind of low silicon high phosphorus hot metal of the high manganese of converter smelting proposes the preparation method that carbon protects manganese, 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 115kg/tSteelSteel scrap be packed into proportion, the steel scrap of following mass ratio is added in 50 tons of LD converters: C 0.20wt%, Si 0.30wt%, Mn 1.15wt%, P 0.020wt%, S 0.022wt%, remaining for Fe and inevitably not Pure object；By 960kg/tSteelMolten iron be packed into proportion, the low silicon high phosphorus of high manganese of following temperatures and mass ratio is added in 50 tons of LD converters Molten iron: 1325 DEG C of molten iron temperature, hot metal composition C 4.2wt%, Si 0.10wt%, Mn 1.20wt%, 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 the high manganese of step A and steel scrap cold burden 50 tons of LD converters of loading, 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 0.75~0.80MPa；From high hopper by 3.0kg/ after lighting a fire successfully tSteelAmount, the slag former of following mass ratio: CaO 22.5%, SiO is added226.3%, MgO 18.5%, Al2O3 6.2%, FeO 13.5%, remaining is Fe and inevitable impurity；It opens and is blown to 20 seconds, oxygen presses 0.80MPa control, and oxygen lance position presses 1.5m 2.7kg/t is pressed in control respectivelySteel、3.0kg/tSteelAmount, regular activated lime and light dolomite slag making is added, by 1.0kg/tSteel Amount, 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；To 20-80 seconds, oxygen pressed 0.80MPa control, oxygen rifle for blowing Rifle position is down to 0.9m, presses 2.5kg/t respectivelySteel、2.5kg/tSteel、2.7kg/tSteelAmount, regular activated lime, light-burned white clouds is added Stone, magnesite ball slag making, 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 80-300 seconds, Oxygen presses 0.80MPa control, and control of lance position 1.0m presses 5.5kg/t respectivelySteel、5.0kg/tSteelAmount, be added it is regular activated Lime, light dolomite slag making slugging.
C, mid-term smelting process: step B molten steel blew to 300-400 seconds, and oxygen presses 0.80MPa control, oxygen lance position control It is made as 1.1m, by 0.8kg/tSteelAmount, regular activated lime is added；By 0.8kg/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；To 400-700 seconds, oxygen pressed 0.80MPa control, control of lance position 1.2m, and presses 0.8kg/ for blowing tSteelAmount conventional iron ore coolant is added；Blowing was to 700-750 seconds, and oxygen presses 0.85MPa control, and oxygen lance position is down to 0.8m, pressure rifle position carry out the sampling of falling furnace after blowing deeply 25 seconds, the molten steel of falling furnace control requires: 1615 DEG C of temperature, C 0.22wt%, Mn 0.45wt%、P 0.020wt%、S 0.020wt%。
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 780 seconds- Terminal is tapped the stage, and oxygen presses 0.85MPa control, and oxygen lance position is controlled by 0.8-0.9m, and terminal tapping molten steel control requires: temperature Spend 1640 DEG C, C 0.15wt%, P 0.016wt%, Mn0.40wt%, S 0.015wt%.
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 0.15wt%, P 0.016wt%, Mn 0.40wt%, S 0.013wt%, remaining is Fe and can not keep away The impurity exempted from.
Embodiment 2
A kind of low silicon high phosphorus hot metal of the high manganese of converter smelting proposes the method that carbon protects manganese, 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 130kg/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 0.42wt%, Mn 1.25wt%, P 0.029wt%, S 0.028wt%, remaining for Fe and inevitably not Pure object；By 945kg/tSteelMolten iron be packed into proportion, the low silicon high phosphorus of high manganese of following temperatures and mass ratio is added in 50 tons of LD converters Molten iron: 1320 DEG C of molten iron temperature, hot metal composition C 4.5wt%, Si 0.15wt%, Mn 1.35wt%, P 0.155wt%, S 0.030wt%, remaining is Fe and inevitable impurity.
B, it smelting process early period: after the low silicon high phosphorus hot metal of the high manganese of step A and steel scrap cold burden 50 tons of LD converters of loading, 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 0.75~0.80MPa；From high hopper by 3.0kg/ after lighting a fire successfully tSteelAmount, the slag former of following mass ratio: CaO 22.5%, SiO is added226.3%, MgO 18.5%, Al2O3 6.2%, FeO 13.5%, remaining is Fe and inevitable impurity；It opens and is blown to 20 seconds, oxygen presses 0.80MPa control, and oxygen lance position presses 1.5m 3.1kg/t is pressed in control respectivelySteel、3.2kg/tSteelAmount, regular activated lime and light dolomite slag making is added, by 1.0kg/tSteel Amount, 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；To 20-80 seconds, oxygen pressed 0.80MPa control, oxygen rifle for blowing Rifle position is down to 0.9m, presses 2.9kg/t respectivelySteel、3.0kg/tSteel、3.1kg/tSteelAmount, regular activated lime, light-burned white clouds is added Stone, magnesite ball slag making, 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 80-300 seconds, Oxygen presses 0.80MPa control, and control of lance position 1.0m presses 6.0kg/t respectivelySteel、5.2kg/tSteelAmount, be added it is regular activated Lime, light dolomite slag making slugging.
C, mid-term smelting process: step B molten steel blew to 300-400 seconds, and oxygen presses 0.80MPa control, oxygen lance position control It is made as 1.1m, by 2.0kg/tSteelAmount, regular activated lime is added；By 1.2kg/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；To 400-700 seconds, oxygen pressed 0.80MPa control, control of lance position 1.2m, and presses 1.1kg/ for blowing tSteelAmount conventional iron ore coolant is added；Blowing was to 700-750 seconds, and oxygen presses 0.85MPa control, and oxygen lance position is down to 0.8m, pressure rifle position carry out the sampling of falling furnace after blowing deeply 28 seconds, the molten steel of falling furnace control requires: 1629 DEG C of temperature, C 0.19wt%, Mn 0.57wt%、P 0.025wt%、S 0.026wt%。
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 780 seconds- Terminal is tapped the stage, and oxygen presses 0.85MPa control, and oxygen lance position is controlled by 0.8-0.9m, and terminal tapping molten steel control requires: temperature Spend 1655 DEG C, C 0.12wt%, P 0.023wt%, Mn 0.50wt%, S 0.025wt%.
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 1.5kg/tSteel；Tapping process is 18NL/min using whole bottom argon blowing technology, argon flow control；Finally obtain with following The molten steel of weight percent: C 0.12wt%, P 0.020wt%, Mn 0.50wt%, S 0.020wt%, remaining is Fe and can not keep away The impurity exempted from.
Embodiment 3
A kind of low silicon high phosphorus hot metal of the high manganese of converter smelting proposes the preparation method that carbon protects manganese, 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 145kg/tSteelSteel scrap be packed into proportion, the steel scrap of following mass ratio is added in 50 tons of LD converters: C 0.25wt%, Si 0.55wt%, Mn 1.35wt%, P 0.037wt%, S 0.036wt%, remaining for Fe and inevitably not Pure object；By 930kg/tSteelMolten iron be packed into proportion, the low silicon high phosphorus of high manganese of following temperatures and mass ratio is added in 50 tons of LD converters Molten iron: 1310 DEG C of molten iron temperature, hot metal composition C 4.8wt%, Si 0.20wt%, Mn 1.50wt%, P 0.180wt%, S 0.040wt%, remaining is Fe and inevitable impurity.
B, it smelting process early period: after the low silicon high phosphorus hot metal of the high manganese of step A and steel scrap cold burden 50 tons of LD converters of loading, 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 0.75~0.80MPa；From high hopper by 3.0kg/ after lighting a fire successfully tSteelAmount, the slag former of following mass ratio: CaO 22.5%, SiO is added226.3%, MgO 18.5%, Al2O3 6.2%, FeO 13.5%, remaining is Fe and inevitable impurity；It opens and is blown to 20 seconds, oxygen presses 0.80MPa control, and oxygen lance position presses 1.5m 3.5kg/t is pressed in control respectivelySteel、3.4kg/tSteelAmount, regular activated lime and light dolomite slag making is added, by 1.0kg/tSteel Amount, 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；To 20-80 seconds, oxygen pressed 0.80MPa control, oxygen rifle for blowing Rifle position is down to 0.9m, presses 3.2kg/t respectivelySteel、3.5kg/tSteel、3.5kg/tSteelAmount, regular activated lime, light-burned white clouds is added Stone, magnesite ball slag making, 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 80-300 seconds, Oxygen presses 0.80MPa control, and control of lance position 1.0m presses 6.5kg/t respectivelySteel、5.5kg/tSteelAmount, be added it is regular activated Lime, light dolomite slag making slugging.
C, mid-term smelting process: step B molten steel blew to 300-400 seconds, and oxygen presses 0.80MPa control, oxygen lance position control It is made as 1.1m, by 3.0kg/tSteelAmount, regular activated lime is added；By 1.6kg/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；To 400-700 seconds, oxygen pressed 0.80MPa control, control of lance position 1.2m, and presses 1.5 kg/ for blowing tSteelAmount conventional iron ore coolant is added；Blowing was to 700-750 seconds, and oxygen presses 0.85MPa control, and oxygen lance position is down to 0.8m, pressure rifle position carry out the sampling of falling furnace after blowing deeply 30 seconds, the molten steel of falling furnace control requires: 1640 DEG C of temperature, C 0.15wt%, Mn 0.70wt%、P 0.030wt%、S 0.030wt%。
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 780 seconds- Terminal is tapped the stage, and oxygen presses 0.85MPa control, and oxygen lance position is controlled by 0.8-0.9m, and terminal tapping molten steel control requires: temperature Spend 1670 DEG C, C 0.09wt%, P 0.025wt%, Mn 0.60wt%, S 0.028wt%.
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 2.0kg/tSteel；Tapping process is 20NL/min using whole bottom argon blowing technology, argon flow control；Finally obtain with following The molten steel of weight percent: C 0.09wt%, P 0.025wt%, Mn 0.60wt%, S 0.025wt%, remaining is Fe and can not keep away The impurity exempted from.

Claims (7)

1. a kind of low silicon high phosphorus hot metal of the high manganese of converter smelting proposes the preparation method that carbon protects manganese, 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 4.0kg/tSteelAmount, to Light dolomite is added in converter；By 115-145kg/tSteelSteel scrap be packed into proportion, steel scraps are added in 50 tons of LD converters；By 930- 960kg/tSteelMolten iron be packed into proportion, the low silicon high phosphorus hot metal of high manganese of following temperatures and mass ratio: iron is added in 50 tons of LD converters Coolant-temperature gage >=1310 DEG C, hot metal composition C 4.2-4.8wt%, Si 0.10-0.20wt%, Mn 1.20-1.50wt%, P 0.130-0.180wt%, S≤0.040wt%, remaining is Fe and inevitable impurity；
B, smelting process early period: after the low silicon high phosphorus hot metal of the high manganese of step A and steel scrap cold burden 50 tons of LD converters of loading, front and back grate is allowed Lower oxygen rifle, which is opened, after molten iron is exposed blows, and igniting oxygen pressure is 0.75~0.80MPa；From high hopper by 3.0kg/t after lighting a fire successfullySteel's Slag former is added in amount；It opens and is blown to 20 seconds, oxygen presses 0.80MPa control, and oxygen lance position is controlled by 1.5m, presses 2.7- respectively 3.5kg/tSteel、3.0-3.4kg/tSteelAmount, regular activated lime and light dolomite slag making is added, by 1.0kg/tSteelAmount, add Enter slagging agent；Blowing was to 20-80 seconds, and oxygen presses 0.80MPa control, and oxygen lance position is down to 0.9m, pressed 2.5-3.2kg/t respectivelySteel、 2.5-3.5kg/tSteel、2.7-3.5kg/tSteelAmount, regular activated lime, light dolomite, magnesite ball slag making is added, by 1.5kg/ tSteelAmount, add slagging agent；To 80-300 seconds, oxygen pressed 0.80MPa control, control of lance position 1.0m, difference for blowing By 5.5-6.5kg/tSteel、5.0-5.5kg/tSteelAmount, regular activated lime, light dolomite slag making slugging is added；
C, mid-term smelting process: step B molten steel blew to 300-400 seconds, and oxygen presses 0.80MPa control, and control of lance position is 1.1m, by 0.8-3.0kg/tSteelAmount, regular activated lime is added；By 0.8-1.6kg/tSteelAmount, be added slagging agent；Blowing is extremely 400-700 seconds, oxygen pressed 0.80MPa control, control of lance position 1.2m, and presses 0.8-1.5 kg/tSteelAmount be added it is conventional Iron ore coolant；To 700-750 seconds, oxygen pressed 0.85MPa control for blowing, and oxygen lance position is down to 0.8m, and pressure rifle position blows 25- deeply The sampling of falling furnace is carried out after 30 seconds, controls 1615~1640 DEG C of the liquid steel temperature of falling furnace；
D, converter smelting latter stage technique: grate continues lower oxygen rifle blowing, blowing to 780 seconds-terminal after the sampling of falling furnace of step C molten steel Tapping stage, oxygen press 0.85MPa control, and oxygen lance position is controlled by 0.8-0.9m, and control terminal tapping liquid steel temperature 1640~ 1670℃；
E, converter tapping technique: active lime wash heat, lime adding amount 1.0- is added in ladle bottom before D step molten steel is tapped 2.0kg/tSteel；Tapping process is 15~20NL/min using whole bottom argon blowing technology, argon flow control；It finally can be obtained and mention The smelting molten steel of carbon guarantor's manganese.
2. the low silicon high phosphorus hot metal of the high manganese of converter smelting according to claim 1 proposes the preparation method that carbon protects manganese, feature exists The steel scrap described in step A includes the ingredient of following mass ratio: C 0.20-0.25wt%, Si 0.30-0.55wt%, Mn 1.15-1.35wt%, P 0.020-0.037wt%, S 0.022-0.036wt%, remaining is Fe and inevitable impurity.
3. the low silicon high phosphorus hot metal of the high manganese of converter smelting according to claim 1 proposes the preparation method that carbon protects manganese, feature exists The slag former described in step B includes the ingredient of following mass ratio: CaO 22.5%, SiO226.3%, MgO 18.5%, Al2O3 6.2%, FeO 13.5%, remaining is Fe and inevitable impurity.
4. the low silicon high phosphorus hot metal of the high manganese of converter smelting according to claim 1 proposes the preparation method that carbon protects manganese, feature exists In the ingredient that the slagging agent includes 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.
5. the low silicon high phosphorus hot metal of the high manganese of converter smelting according to claim 1 proposes the preparation method that carbon protects manganese, feature exists The component requirements of the molten steel of falling furnace described in step C be C 0.15-0.22wt%, Mn 0.45-0.70wt%, P≤ 0.030wt%、S≤0.030wt%。
6. the low silicon high phosphorus hot metal of the high manganese of converter smelting according to claim 1 proposes the preparation method that carbon protects manganese, feature exists The component requirements of the tapping molten steel of the terminal described in step D are 0.09~0.15wt% of C, P≤0.025wt%, Mn0.40- 0.60wt%、S≤0.028wt%。
7. the low silicon high phosphorus hot metal of the high manganese of converter smelting according to claim 1 proposes the preparation method that carbon protects manganese, feature exists The smelting molten steel that carbon protects manganese is mentioned described in the step E has the ingredients of following weight percents: 0.09~0.15wt% of C, P≤ 0.025wt%, Mn0.40-0.60wt%, S≤0.025wt%, remaining is Fe and inevitable impurity.
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