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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
steel
manganese
oxygen
control
added
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201811155329.XA
Other languages
Chinese (zh)
Other versions
CN109161634B (en
Inventor
陈伟
张卫强
吴光耀
邹荣
欧阳晨曦
李金柱
付士富
赵卫东
陈大双
王定树
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan Iron and Steel Group Kunming Iron and Steel Co Ltd
Original Assignee
Wuhan Iron and Steel Group Kunming Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan Iron and Steel Group Kunming Iron and Steel Co Ltd filed Critical Wuhan Iron and Steel Group Kunming Iron and Steel Co Ltd
Priority to CN201811155329.XA priority Critical patent/CN109161634B/en
Publication of CN109161634A publication Critical patent/CN109161634A/en
Application granted granted Critical
Publication of CN109161634B publication Critical patent/CN109161634B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • 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

Landscapes

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

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

The low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in a kind of converter smelting
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.
CN201811155329.XA 2018-09-30 2018-09-30 Preparation method for extracting carbon and preserving manganese from medium-manganese low-silicon high-phosphorus iron water in converter smelting Active CN109161634B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811155329.XA CN109161634B (en) 2018-09-30 2018-09-30 Preparation method for extracting carbon and preserving manganese from medium-manganese low-silicon high-phosphorus iron water in converter smelting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811155329.XA CN109161634B (en) 2018-09-30 2018-09-30 Preparation method for extracting carbon and preserving manganese from medium-manganese low-silicon high-phosphorus iron water in converter smelting

Publications (2)

Publication Number Publication Date
CN109161634A true CN109161634A (en) 2019-01-08
CN109161634B CN109161634B (en) 2020-03-20

Family

ID=64877373

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811155329.XA Active CN109161634B (en) 2018-09-30 2018-09-30 Preparation method for extracting carbon and preserving manganese from medium-manganese low-silicon high-phosphorus iron water in converter smelting

Country Status (1)

Country Link
CN (1) CN109161634B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
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
CN114934149A (en) * 2022-06-08 2022-08-23 中天钢铁集团有限公司 Method for recycling steelmaking solid waste

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101117651A (en) * 2006-07-31 2008-02-06 宝山钢铁股份有限公司 Converting process for converter low-silicon molten iron
CN104726645A (en) * 2015-04-10 2015-06-24 武钢集团昆明钢铁股份有限公司 Dephosphorization method of mid-high phosphorus semisteel
CN105671237A (en) * 2016-03-17 2016-06-15 武钢集团昆明钢铁股份有限公司 Low-cost slagging and dephosphorizing technique for high-phosphorus molten iron through converter smelting

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101117651A (en) * 2006-07-31 2008-02-06 宝山钢铁股份有限公司 Converting process for converter low-silicon molten iron
CN104726645A (en) * 2015-04-10 2015-06-24 武钢集团昆明钢铁股份有限公司 Dephosphorization method of mid-high phosphorus semisteel
CN105671237A (en) * 2016-03-17 2016-06-15 武钢集团昆明钢铁股份有限公司 Low-cost slagging and dephosphorizing technique for high-phosphorus molten iron through converter smelting

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
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
CN114934149A (en) * 2022-06-08 2022-08-23 中天钢铁集团有限公司 Method for recycling steelmaking solid waste
CN114934149B (en) * 2022-06-08 2023-10-03 中天钢铁集团有限公司 Recycling method of steelmaking solid waste

Also Published As

Publication number Publication date
CN109161634B (en) 2020-03-20

Similar Documents

Publication Publication Date Title
CN109161634A (en) The low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in a kind of converter smelting
CN109112249A (en) A kind of middle high manganese molten iron improves the converter smelting method of the residual manganese of endpoint molten steel
CN109055649B (en) Preparation method for extracting carbon and preserving manganese by converter smelting high-manganese high-silicon high-phosphorus iron water
CN108396093A (en) A method of improving the residual manganese content of converter terminal molten steel
CN105039648A (en) Method for smelting low-carbon and high-manganese-content molten steel through argon oxygen decarburizing furnace
CN101096715A (en) Electric furnace smelting method for low-carbon low-silicon steel
CN109097522B (en) Converter smelting method for molten steel residual manganese at medium-high manganese, high phosphorus and low silicon iron water extraction and improvement end point
CN112760550A (en) Production method of nickel-free copper-phosphorus weathering steel casting blank
US7641713B2 (en) Method for reducing Cr in metallurgical slags containing Cr
CN109161635A (en) A kind of high manganese high-sulfur high phosphorus hot metal of converter smelting proposes the preparation method of carbon guarantor's manganese
CN109161633A (en) Manganese high phosphorus hot metal proposes the preparation method that carbon protects manganese in a kind of converter smelting
CN104232845A (en) Argon oxygen decarburization (AOD) slag-making method during smelting of sulfur-containing free-cutting stainless steel
CN104946845A (en) Method for producing high-carbon-chrome bearing steel from vanadium-titanium-containing molten iron
CN101864508B (en) Steel making method of convertor with small slag quantity
CN109161636A (en) A kind of high manganese high phosphorus hot metal of converter smelting proposes the preparation method of carbon guarantor's manganese
CN109097521A (en) A kind of low silicon high phosphorus hot metal of the high manganese of converter smelting proposes the preparation method that carbon protects manganese
CN101875998A (en) Smelting process in early stage of furnace life of argon-oxygen furnace
CN109722589A (en) A kind of production method of semisteel smelting weathering steel
CN115418429A (en) Method for smelting 200-series stainless steel in AOD furnace
CN111074037B (en) Process method for upgrading structure of manganese-rich slag smelting product
CN102453829B (en) Free-machining pinion steel smelting method and free-machining pinion steel
CN104745761B (en) The method of semisteel smelting converter terminal residue adjustment
CN101570805B (en) Method for producing low alloy steel containing manganese and chromium by using dephosphorized molten iron, manganese ores and chromium ores
CN106086286A (en) Vanadium-bearing hot metal smelts the method controlling steelmaking converter tapping phosphorus content
CN109136452B (en) Converter smelting method for molten steel residual manganese at high-manganese high-silicon iron water extraction and improvement end point

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant