CN109097522B - Converter smelting method for molten steel residual manganese at medium-high manganese, high phosphorus and low silicon iron water extraction and improvement end point - Google Patents

Converter smelting method for molten steel residual manganese at medium-high manganese, high phosphorus and low silicon iron water extraction and improvement end point Download PDF

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CN109097522B
CN109097522B CN201811155841.4A CN201811155841A CN109097522B CN 109097522 B CN109097522 B CN 109097522B CN 201811155841 A CN201811155841 A CN 201811155841A CN 109097522 B CN109097522 B CN 109097522B
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steel
manganese
converter
molten steel
slag
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CN109097522A (en
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陈伟
王炳海
张卫强
邹荣
吴光耀
欧阳晨曦
李金柱
漆鑫
曹重
陈大双
赵卫东
付仕孟
汪世富
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Yunnan Titanium Industry 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
    • C21C5/36—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
    • 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
    • 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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  • 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

The invention discloses a converter smelting method for improving end-point molten steel residual manganese by using medium-high manganese, high phosphorus and low silicon molten iron (C4.20-4.60 wt%, Mn0.90-1.15wt%, Si 0.05-0.15wt%, P0.100-0.130 wt% and S less than or equal to 0.040wt%), which integrates and creates the processes of slag remaining operation, continuous casting residue application, low-alkalinity slag-making process, constant-pressure low-gun position operation in the smelting process, slag washing in the whole tapping process and the like, optimizes the smelting reaction kinetics and thermodynamic conditions, improves the distribution concentration of (MnO) in slag in the smelting process, obtains better dephosphorization effect of smelting slag under the conditions of less slag and low-alkalinity slag system, reduces the molten steel back phosphorus in the later stage and the tapping process to the maximum extent, obviously improves the end-point molten steel residual Mn content (0.43-0.55wt%), reduces the manganese alloy addition amount in the deoxidation alloying process, and obviously reduces the steelmaking alloy consumption and alloying cost, promotes the improvement of the economic indexes of the smelting technology and improves the market competitiveness of the product.

Description

Converter smelting method for molten steel residual manganese at medium-high manganese, high phosphorus and low silicon iron water extraction and improvement end point
Technical Field
The invention belongs to the technical field of steel metallurgy steelmaking technology, and particularly relates to a converter smelting method for extracting and increasing terminal molten steel residual manganese from medium-high manganese high-phosphorus low-silicon iron water.
Background
Manganese (Mn) is a beneficial element in steel, Mn in molten iron is mostly oxidized in the blowing process of a converter, and a small amount of Mn (namely residual Mn) remains in molten steel at the smelting end point. The Mn content of molten steel at the smelting end point of the converter mainly comes from Mn in molten iron, manganese oxidation and reduction reactions occur among a metal melting pool, molten slag and oxygen in the blowing process, and the content of residual Mn finally remaining in the molten steel at the end point of the converter is influenced by factors such as slag quantity, oxidability of molten steel and slag at the end point of the converter, and the temperature at the end point of the converter. The content of residual Mn in molten steel at the end point directly influences the stability of converter operation and the addition of manganese alloy in deoxidation alloying.
At present, low-manganese molten iron with the Mn content of 0.25-0.50wt% is mostly adopted for smelting in a converter in domestic steel works, the Mn content of the molten iron is lower, the slag amount in the smelting process is large, the alkalinity of slag is high, the distribution concentration of (MnO) in slag is low, the reduction efficiency of (MnO) in slag in the smelting process is lower, the residual Mn content of molten steel at the end point is lower (less than or equal to 0.12wt%), the manganese alloy adding amount in the deoxidation alloying process is more, and the alloy consumption and the alloying cost are higher. In recent years, many domestic steel mills make many efforts and attempts to improve the content of residual manganese in molten steel at the smelting end point of the converter, and the main method is that the converter adopts manganese ore for smelting reduction, so as to achieve the purpose of improving the content of residual manganese in molten steel by optimizing the smelting process. For example, in the condition that the Mn content of molten iron is 0.25-0.40wt%, the Tangshanguofeng iron and steel company Limited adds a certain proportion of manganese ore through converter smelting, and the residual Mn content of molten steel is increased from 0.06wt% to 0.09wt% at the end point; smelting molten iron with Mn content of 0.35-0.60wt% in five steel plants, adding 20% manganese ore through converter smelting, and increasing the residual Mn content in molten steel from 0.10wt% to 0.15wt% at the end point. In addition, in a few domestic steel mills, the residual Mn in molten steel at the end of smelting is improved to a certain extent by optimizing the converter smelting operation process, for example, Fujian Sanan steel is optimized by the converter smelting process with the content of the Mn in molten iron of 0.35-0.55wt%, the residual Mn in molten steel at the end is improved to 0.15wt% from 0.12wt%, Lei-Shi steel company is optimized by the converter smelting process with the content of the Mn in molten iron of 0.30-0.50wt%, and the residual Mn in molten steel at the end is improved to 0.12wt% from 0.08 wt%.
In recent years, a few domestic steel mills produce molten iron with the following chemical components by adding a certain proportion of Vietnam precious sand ore with high MnO content (MnO: 4.10-4.40%): 4.20 to 4.60 weight percent of C, 0.90 to 1.15 weight percent of Mn0.05 to 0.15 weight percent of Si, 0.100 to 0.130 weight percent of P, less than or equal to 0.040 weight percent of S and the balance of Fe and inevitable impurities, and how to rapidly form slag, improve the distribution concentration of (MnO) in slag and the dephosphorization rate of molten steel, reduce molten steel rephosphorization in the later smelting period and the tapping process, further improve the residual Mn content of molten steel at the end point and reduce the addition of manganese alloy is very important and urgent. At present, most converter smelting in steel plants at home basically adopts low Mn and low P molten iron with the following chemical components (Mn is less than or equal to 0.55wt%, Si is 0.25-0.45wt%, and P is less than or equal to 0.085wt%), a certain research report is made on the converter smelting process for improving the terminal molten steel residual Mn content by the molten iron components at home, but no relevant research report is made on the converter smelting method for improving the terminal molten steel residual manganese by using medium-high manganese high-phosphorus low-silicon molten iron with the following chemical components (Mn0.90-1.15wt%, Si is 0.05-0.15wt%, and P is 0.100-0.130 wt%). In order to solve the problems, the invention is necessary to provide a converter smelting method for molten steel residual manganese at the end point of high-manganese high-phosphorus low-silicon iron water extraction.
Disclosure of Invention
The invention aims to provide a converter smelting method for molten steel residual manganese at a medium-high manganese, high-phosphorus and low-silicon iron water improvement end point.
The aim of the invention is achieved by the following process steps:
A. the smelting and charging process comprises the following steps: after the slag splashing of the steel tapping of the upper furnace is finished, retaining all the final slag in the converter according to the proportion of 4.0-5.0kg/tSteelAdding conventional active lime into the converter; according to the ratio of 55-70kg/tSteelThe scrap steel is added into a 50-ton LD converter according to the proportion; according to 50kg/tSteelCharging pig iron into a 50-ton LD converter according to a proportioning ratio; thereafter, 950-fold and 980kg/tSteelThe molten iron charging proportion is that the following medium-high manganese, high phosphorus and low silicon molten iron is added into a 50-ton LD converter according to the following temperature and mass ratio: the temperature of the molten iron is more than or equal to 1300 ℃, the components of the molten iron comprise 4.20-4.60wt% of C, 0.90-1.15wt% of Mn, 0.05-0.15wt% of Si, 0.100-0.130wt% of P, less than or equal to 0.040wt% of S, and the balance of Fe and inevitable impurities;
B. the early smelting process comprises the following steps: step A, after charging high-manganese high-phosphorus low-silicon molten iron, scrap steel and pig iron cold charge into a 50-ton LD converter, shaking the converter front and back to expose the molten iron and then blowing the molten iron by an oxygen lance, wherein the ignition oxygen pressure is 0.80 MPa; after ignition is successful, adding continuous casting slag with the granularity of 2-5mm from an overhead bin according to the amount of 5.0-6.0kg/t steel; blowing is started after the casting residue is fed, the alkalinity of the slag in the smelting process is controlled according to 2.0-2.4, the blowing is started for 20 seconds, the lance position of an oxygen lance is controlled according to 1.2m, the oxygen pressure is controlled according to 0.88MPa, and the oxygen pressure is controlled according to 2.0-3.0kg/tSteelAdding conventional active lime for slagging; blowing for 20-140 s, lowering the lance position of the oxygen lance to 0.9-1.0m, and controlling the oxygen pressure at 0.85MPa and 8.0-10.0kg/t respectivelySteel、9.0-11.5kg/tSteelAmount of BaCO added3Is composed of slag former and light-burned dolomite for slagging in a proportion of 1.0kg/tSteelAdding a slagging agent to promote slagging; after the slag is taken off for 140 seconds, the lance position is timely increased to 1.1m, the blowing time is increased to 140-second, the oxygen pressure is controlled at 0.85MPa, and the lance position of the oxygen lance is controlled at 1.1-1.2m, respectively at 2.0-3.0kg/tSteel1.0-2.0kg/tSteelIn an amount of BaCO3The slag former and the magnesite balls are used for slagging again;
C. the middle-stage smelting process comprises the following steps: b, blowing the molten steel to 250-400 seconds, controlling the oxygen pressure at 0.85MPa and controlling the lance position of the oxygen lance to be 1.0-1.1 m; blowing for 660 seconds at 400 ℃ and 85MPa, and controlling the oxygen pressure to be 0.85MPa and the lance position of the oxygen lance to be 1.1-1.2 m; when the blowing time is 660 seconds, controlling the oxygen pressure according to 0.85MPa, lowering the lance position of the oxygen lance to 0.8m, carrying out oxygen lance lifting and converter reversing sampling after deep blowing at the lance pressing position for 20 seconds, and controlling the converter reversing molten steel temperature to 1610-1630 ℃;
D. the final stage process of converter smelting: c, after the molten steel is poured out of the furnace and sampled, swinging the furnace to continue blowing by an oxygen lance, blowing till 660 seconds-tapping stage, controlling the oxygen pressure according to 0.85MPa, controlling the lance position of the oxygen lance according to 1.0m, and controlling the temperature of the molten steel tapped at the end point to be 1630-1650 ℃;
E. the converter tapping process comprises the following steps: d, adding active lime into the bottom of the steel ladle for washing before tapping of molten steel, wherein the addition amount of lime is 2.0kg/tSteel(ii) a A whole-process bottom argon blowing process is adopted in the tapping process, and the flow rate of argon is controlled to be 20-30 NL/min; finally, the smelting molten steel with improved residual manganese is obtained.
Compared with the prior art, the invention has the beneficial effects that:
1. the converter smelting method for improving the end-point molten steel residual manganese content of the medium-high manganese, high phosphorus and low silicon molten iron (C4.20-4.60 wt%, Mn0.90-1.15wt%, Si 0.05-0.15wt%, P0.100-0.130 wt% and S less than or equal to 0.040wt%) provided by the invention optimizes smelting reaction kinetics and thermodynamic conditions, improves distribution concentration of (MnO) in slag in a smelting process, obtains better dephosphorization effect of smelting slag under the conditions of less slag and low alkalinity slag system, reduces molten steel phosphorus return in the later smelting period and the tapping process to the maximum extent and obviously improves the end-point molten steel residual Mn content (0.43-0.55wt%) by adopting slag remaining operation, continuous casting residue application, a low alkalinity slag-making process, constant-pressure low-gun position operation in the smelting process, slag washing in the whole tapping process and the like.
2. The method obviously improves the residual Mn content (0.43-0.55wt%) of the molten steel at the end point, greatly reduces the addition of manganese alloy in the deoxidation alloying process, obviously reduces the alloying cost of steelmaking and improves the market competitiveness of products.
3. The invention realizes the significant improvement of the residual Mn content of the end-point molten steel by integrating and innovating a converter smelting charging system, a slag charge structure, a slagging process, an oxygen supply system, an oxygen lance position control curve, a temperature control system, a process, an end-point control process and a tapping slag washing process, wherein the C content of the end-point molten steel is more than or equal to 0.08wt%, and the residual Mn content is 0.43-0.55 wt%.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to be limiting in any way, and any modifications or alterations based on the teachings of the present invention are intended to fall within the scope of the present invention.
The invention relates to a converter smelting method for molten steel residual manganese at the end point of water extraction and improvement of medium-high manganese, high-phosphorus and low-silicon iron, which comprises the following process steps:
A. the smelting and charging process comprises the following steps: after the slag splashing of the steel tapping of the upper furnace is finished, retaining all the final slag in the converter according to the proportion of 4.0-5.0kg/tSteelAdding conventional active lime into the converter; according to the ratio of 55-70kg/tSteelThe scrap steel is added into a 50-ton LD converter according to the proportion; according to 50kg/tSteelCharging pig iron into a 50-ton LD converter according to a proportioning ratio; thereafter, 950-fold and 980kg/tSteelThe molten iron charging proportion is that the following medium-high manganese, high phosphorus and low silicon molten iron is added into a 50-ton LD converter according to the following temperature and mass ratio: the temperature of the molten iron is more than or equal to 1300 ℃, the components of the molten iron comprise 4.20-4.60wt% of C, 0.90-1.15wt% of Mn, 0.05-0.15wt% of Si, 0.100-0.130wt% of P, less than or equal to 0.040wt% of S, and the balance of Fe and inevitable impurities;
B. the early smelting process comprises the following steps: step A, after charging high-manganese high-phosphorus low-silicon molten iron, scrap steel and pig iron cold charge into a 50-ton LD converter, shaking the converter front and back to expose the molten iron and then blowing the molten iron by an oxygen lance, wherein the ignition oxygen pressure is 0.80 MPa; after ignition is successful, adding continuous casting slag with the granularity of 2-5mm from an overhead bin according to the amount of 5.0-6.0kg/t steel; blowing is started after the casting residue is fed, the alkalinity of the slag in the smelting process is controlled according to 2.0-2.4, the blowing is started for 20 seconds, the lance position of an oxygen lance is controlled according to 1.2m, the oxygen pressure is controlled according to 0.88MPa, and the oxygen pressure is controlled according to 2.0-3.0kg/tSteelAdding conventional active lime for slagging; blowing for 20-140 s, lowering the lance position of the oxygen lance to 0.9-1.0m, and controlling the oxygen pressure at 0.85MPa and 8.0-10.0kg/t respectivelySteel、9.0-11.5kg/tSteelAmount of BaCO added3Is composed of slag former and light-burned dolomite for slagging in a proportion of 1.0kg/tSteelAdding a slagging agent to promote slagging; after the slag is taken off for 140 seconds, the lance position is timely increased to 1.1m, the blowing time is increased to 140-second, the oxygen pressure is controlled at 0.85MPa, and the lance position of the oxygen lance is controlled at 1.1-1.2m, respectively at 2.0-3.0kg/tSteel1.0-2.0kg/tSteelIn an amount of BaCO3The slag former and the magnesite balls are used for slagging again;
C. the middle-stage smelting process comprises the following steps: b, blowing the molten steel to 250-400 seconds, controlling the oxygen pressure at 0.85MPa and controlling the lance position of the oxygen lance to be 1.0-1.1 m; blowing for 660 seconds at 400 ℃ and 85MPa, and controlling the oxygen pressure to be 0.85MPa and the lance position of the oxygen lance to be 1.1-1.2 m; when the blowing time is 660 seconds, controlling the oxygen pressure according to 0.85MPa, lowering the lance position of the oxygen lance to 0.8m, carrying out oxygen lance lifting and converter reversing sampling after deep blowing at the lance pressing position for 20 seconds, and controlling the converter reversing molten steel temperature to 1610-1630 ℃;
D. the final stage process of converter smelting: c, after the molten steel is poured out of the furnace and sampled, swinging the furnace to continue blowing by an oxygen lance, blowing till 660 seconds-tapping stage, controlling the oxygen pressure according to 0.85MPa, controlling the lance position of the oxygen lance according to 1.0m, and controlling the temperature of the molten steel tapped at the end point to be 1630-1650 ℃;
E. the converter tapping process comprises the following steps: d, adding active lime into the bottom of the steel ladle for washing before tapping of molten steel, wherein the addition amount of lime is 2.0kg/tSteel(ii) a A whole-process bottom argon blowing process is adopted in the tapping process, and the flow rate of argon is controlled to be 20-30 NL/min; finally, the smelting molten steel with improved residual manganese is obtained.
Further, the scrap steel in the step A comprises the following components in percentage by mass: 0.20 to 0.26 weight percent of C, 0.35 to 0.50 weight percent of Si, 1.20 to 1.40 weight percent of Mn, 0.035 to 0.046 weight percent of P, 0.028 to 0.039 weight percent of S, and the balance of Fe and inevitable impurities.
Further, the pig iron in the step A comprises the following components in percentage by mass: 3.3 to 3.6 weight percent of C, 0.30 to 0.50 weight percent of Si, 0.32 to 0.55 weight percent of Mn, 0.058 to 0.075 weight percent of P, 0.018 to 0.027 weight percent of S, and the balance of Fe and inevitable impurities.
Further, the continuous casting slag in the step B comprises the following components in percentage by mass: CaO 21.0-23.0%, SiO227.5-30.5%，MgO 8.9-10.4%, Al2O31.5-2.5%, MnO 8.8-9.7%, S0.065-0.078%, P0.018-0.025%, and the balance Fe and inevitable impurities.
Further, the amount of the compound in the step B is 8.0-10.0kg/tSteelMetered BaCO3The slag former comprises the following components in percentage by mass: BaCO354.5 wt%，BaSO421.6 wt%，SiO219.7 wt%, Fe2O33.4 wt%, S0.085wt%, P0.068wt%, and the balance Fe and inevitable impurities.
Further, the slagging agent in the step B comprises the following components in percentage by mass: CaO 27.5%, Al2O35.2%，FeO 16.5%, Fe2O323.5%, MnO7.6%, S0.085%, and the balance of Fe and inevitable impurities.
Further, the amount of the compound in step B is 2.0-3.0kg/tSteelIn an amount of BaCO3The slag former comprises the following components in percentage by mass: BaCO354.5 wt%，BaSO421.6 wt%，SiO219.7 wt%, Fe2O33.4 wt%, S0.085wt%, P0.068wt%, and the balance Fe and inevitable impurities.
Further, the component requirements of the control of the converter molten steel in the step C are as follows: 0.12 to 0.20wt% of C, 0.47 to 0.60wt% of Mn0.47, less than or equal to 0.032wt% of P, and less than or equal to 0.035wt% of S.
Further, the component requirements of the molten steel tapped at the controlled end point in the step D are as follows: 0.08-0.15 wt% of C, less than or equal to 0.030wt% of P, 0.43-0.55wt% of Mn0.033 wt% of S.
Further, the smelting molten steel with improved manganese residue in the step E has the following weight percentage: 0.08 to 0.15 weight percent of C, less than or equal to 0.036 weight percent of P, 0.43 to 0.55 weight percent of Mn0.030 weight percent of S, and the balance of Fe and inevitable impurities.
Example 1
A. The smelting and charging process comprises the following steps: after the slag splashing of the steel tapping of the upper furnace is finished, all the final slag is reserved in the converter according to the proportion of 4.0kg/tSteelAdding conventional active lime into the converter; at 55kg/tSteelThe steel scrap charging ratio is that the following steel scrap in mass ratio is added into a 50-ton LD converter: 0.20wt% of C, 0.35wt% of Si, 1.20wt% of Mn, 0.035wt% of P, 0.028wt% of S, and the balance of Fe and inevitable impurities; according to 50kg/tSteelThe pig iron charging proportion is that the following pig iron is added into a 50-ton LD converter according to the mass ratio: c3.3wt%, Si 0.30 wt%, Mn 0.32wt%, P0.058 wt%, S0.018 wt%, and the balance Fe and inevitable impurities) into an LD converter; thereafter at 980kg/tSteelThe molten iron charging ratio is that the following temperature and quality are added into a 50-ton LD converterThe weight ratio of the medium-high manganese, high phosphorus and low silicon molten iron: the temperature of the molten iron is 1300 ℃, the components of the molten iron are C4.20wt%, Mn0.90wt%, Si 0.05wt%, P0.100wt%, S0.025 wt%, and the balance of Fe and inevitable impurities.
B. The early smelting process comprises the following steps: step A, after charging high-manganese high-phosphorus low-silicon molten iron, scrap steel and pig iron cold charge into a 50-ton LD converter, shaking the converter front and back to expose the molten iron and then blowing the molten iron by an oxygen lance, wherein the ignition oxygen pressure is 0.80 MPa; after the ignition is successful, adding continuous casting slag with the granularity of 2-5mm and the following mass ratio from an overhead bin according to the amount of 5.0kg/t steel: CaO 21.0%, SiO227.5%，MgO 8.9%，Al2O31.5 percent, MnO 8.8 percent, S0.065 percent, P0.018 percent and the balance of Fe and inevitable impurities; blowing is started after the casting residue is fed, the alkalinity of the slag in the smelting process is controlled according to 2.0, the blowing is started for 20 seconds, the lance position of an oxygen lance is controlled according to 1.2m, the oxygen pressure is controlled according to 0.88MPa, and the oxygen pressure is controlled according to 2.0kg/tSteelAdding conventional active lime for slagging; blowing for 20-140 s, lowering the lance position of the oxygen lance to 0.9-1.0m, and controlling the oxygen pressure at 0.85MPa and 8.0kg/t respectivelySteel、9.0kg/tSteelIn an amount of BaCO3A slag former (with the following mass ratio: BaCO)354.5 wt%，BaSO421.6 wt%，SiO219.7 wt%, Fe2O33.4 wt%, S0.085wt%, P0.068wt%, the balance of Fe and inevitable impurities), and 1.0kg/t of light-burned dolomite for slaggingSteelAdding the following slag melting agents in percentage by mass to promote slag melting: CaO 27.5%, Al2O35.2%，FeO 16.5%, Fe2O323.5 percent of Mn, 7.6 percent of Mn, 0.085 percent of S, and the balance of Fe and inevitable impurities; after the slag is taken off for 140 seconds, the lance position is timely increased to 1.1m, the blowing time is increased to 140-second, the oxygen pressure is controlled at 0.85MPa, and the lance position of the oxygen lance is controlled at 1.1-1.2m, respectively at 2.0kg/tSteelAmount of (1.0 kg/t)SteelIn an amount of BaCO3A slag former (with the following mass ratio: BaCO)354.5 wt%，BaSO421.6 wt%，SiO219.7wt%, Fe2O33.4 wt%, S0.085wt%, p0.068wt%, and the balance of Fe and inevitable impurities) and magnesite balls.
C. The middle-stage smelting process comprises the following steps: b, blowing the molten steel to 250-400 seconds, controlling the oxygen pressure at 0.85MPa and controlling the lance position of the oxygen lance to be 1.0-1.1 m; blowing for 660 seconds at 400 ℃ and 85MPa, and controlling the oxygen pressure to be 0.85MPa and the lance position of the oxygen lance to be 1.1-1.2 m; when the blowing time is 660 seconds, the oxygen pressure is controlled according to 0.85MPa, the lance position of the oxygen lance is reduced to 0.8m, the oxygen lance lifting and reversing sampling are carried out after the lance position is pressed for deep blowing for 20 seconds, and the molten steel temperature of reversing is controlled to be 1610 ℃, C is 0.12wt%, Mn is 0.47wt%, P is 0.022wt%, and S is 0.021 wt%.
D. The final stage process of converter smelting: c, after the molten steel is poured into the converter for sampling, the converter is shaken to continue blowing by an oxygen lance, the blowing is carried out to 660 seconds-tapping stage, the oxygen pressure is controlled according to 0.85MPa, the lance position of the oxygen lance is controlled according to 1.0m, and the end point tapping control requirement is as follows: the temperature is 1630 ℃, C0.08wt%, P0.020 wt%, Mn0.43wt% and S0.020wt%.
E. The converter tapping process comprises the following steps: d, adding active lime into the bottom of the steel ladle for washing before tapping of molten steel, wherein the addition amount of lime is 2.0kg/tSteel(ii) a The whole bottom argon blowing process is adopted in the tapping process, and the flow rate of argon is controlled to be 20 NL/min; finally, obtaining the molten steel with the following weight percentages: c0.08wt%, P0.028 wt%, Mn0.43wt%, and S0.019wt%, and the balance of Fe and inevitable impurities.
Example 2
A. The smelting and charging process comprises the following steps: after the slag splashing of the steel tapping of the upper furnace is finished, all the final slag is reserved in the converter according to the proportion of 4.5kg/tSteelAdding conventional active lime into the converter; according to 82kg/tSteelThe steel scrap charging ratio is that the following steel scrap in mass ratio is added into a 50-ton LD converter: 0.23wt% of C, 0.42wt% of Si, 1.30wt% of Mn, 0.040wt% of P, 0.033wt% of S, and the balance of Fe and inevitable impurities; according to 50kg/tSteelThe pig iron charging proportion is that the following pig iron is added into a 50-ton LD converter according to the mass ratio: c3.5wt%, Si 0.40wt%, Mn0.43wt%, P0.067 wt%, S0.022wt%, and the balance Fe and inevitable impurities) into an LD converter; then 965kg/tSteelThe molten iron charging proportion is that the following medium-high manganese, high phosphorus and low silicon molten iron is added into a 50-ton LD converter according to the following temperature and mass ratio: the temperature of molten iron is 1320 ℃, the components of the molten iron are C4.40wt%, Mn1.02wt%, Si 0.07wt%, P0.115wt%, S0.035wt%, and the balance of Fe and inevitable impurities.
B. The early smelting process comprises the following steps: high manganese in step AAfter high-phosphorus low-silicon molten iron, scrap steel and pig iron cold charge are loaded into a 50-ton LD converter, the converter is shaken front and back to expose the molten iron, then the molten iron is blown by an oxygen lance, and the ignition oxygen pressure is 0.80 MPa; after the ignition is successful, adding continuous casting slag with the granularity of 2-5mm and the following mass ratio from an overhead bin according to the amount of 5.5kg/t steel: CaO 22.0%, SiO229.0%，MgO 9.7%，Al2O32.0 percent of manganese dioxide (MnO) 9.2 percent, 0.071 percent of S, 0.022 percent of P, and the balance of Fe and inevitable impurities; blowing is started after the casting residue is fed, the alkalinity of the slag in the smelting process is controlled according to 2.2, the blowing is started for 20 seconds, the lance position of an oxygen lance is controlled according to 1.2m, the oxygen pressure is controlled according to 0.88MPa, and the oxygen pressure is controlled according to 2.5kg/tSteelAdding conventional active lime for slagging; blowing for 20-140 s, lowering the lance position of the oxygen lance to 0.9-1.0m, and controlling the oxygen pressure at 0.85MPa and 9.0kg/t respectivelySteel、10.2kg/tSteelAmount of BaCO added3A slag former (with the following mass ratio: BaCO)354.5 wt%，BaSO421.6 wt%，SiO219.7 wt%, Fe2O33.4 wt%, S0.085wt%, P0.068wt%, the balance of Fe and inevitable impurities), and 1.0kg/t of light-burned dolomite for slaggingSteelAdding the following slag melting agents in percentage by mass to promote slag melting: CaO 27.5%, Al2O35.2%，FeO 16.5%, Fe2O323.5 percent of Mn, 7.6 percent of Mn, 0.085 percent of S, and the balance of Fe and inevitable impurities; after the slag is taken off for 140 seconds, the lance position is timely increased to 1.1m, the blowing time is increased to 140-second, the oxygen pressure is controlled at 0.85MPa, and the lance position of the oxygen lance is controlled at 1.1-1.2m, respectively at 2.5kg/tSteelAmount of (1.5 kg/t)SteelIn an amount of BaCO3A slag former (with the following mass ratio: BaCO)354.5 wt%，BaSO421.6 wt%，SiO219.7 wt%, Fe2O33.4 wt%, S0.085wt%, p0.068wt%, and the balance of Fe and inevitable impurities) and magnesite balls.
C. The middle-stage smelting process comprises the following steps: b, blowing the molten steel to 250-400 seconds, controlling the oxygen pressure at 0.85MPa and controlling the lance position of the oxygen lance to be 1.0-1.1 m; blowing for 660 seconds at 400 ℃ and 85MPa, and controlling the oxygen pressure to be 0.85MPa and the lance position of the oxygen lance to be 1.1-1.2 m; when the blowing time is 660 seconds, the oxygen pressure is controlled according to 0.85MPa, the lance position of the oxygen lance is reduced to 0.8m, the oxygen lance lifting and reversing sampling are carried out after the lance position is pressed for deep blowing for 20 seconds, and the molten steel temperature of reversing is controlled to be 1620 ℃, C is 0.16wt%, Mn is 0.53wt%, P is 0.027wt%, and S is 0.025 wt%.
D. The final stage process of converter smelting: c, after the molten steel is poured into the converter for sampling, the converter is shaken to continue blowing by an oxygen lance, the blowing is carried out to 660 seconds-tapping stage, the oxygen pressure is controlled according to 0.85MPa, the lance position of the oxygen lance is controlled according to 1.0m, and the end point tapping control requirement is as follows: the temperature is 1640 ℃, C0.12wt%, P0.025 wt%, Mn0.48wt%, S0.023 wt%.
E. The converter tapping process comprises the following steps: d, adding active lime into the bottom of the steel ladle for washing before tapping of molten steel, wherein the addition amount of lime is 2.0kg/tSteel(ii) a The whole bottom argon blowing process is adopted in the tapping process, and the flow rate of argon is controlled to be 25 NL/min; finally, obtaining the molten steel with the following weight percentages: c0.12wt%, P0.028 wt%, Mn0.48wt%, S0.022wt%, and the balance Fe and inevitable impurities.
Example 3
A. The smelting and charging process comprises the following steps: after the slag splashing of the steel tapping of the upper furnace is finished, retaining all the final slag in the converter according to the proportion of 5.0kg/tSteelAdding conventional active lime into the converter; according to 70kg/tSteelThe steel scrap charging ratio is that the following steel scrap in mass ratio is added into a 50-ton LD converter: 0.26wt% of C, 0.50wt% of Si, 1.40wt% of Mn, 0.046wt% of P, 0.039wt% of S, and the balance of Fe and inevitable impurities; according to 50kg/tSteelThe pig iron charging proportion is that the following pig iron is added into a 50-ton LD converter according to the mass ratio: c3.6wt%, Si 0.50wt%, Mn0.55wt%, P0.075 wt%, S0.027 wt%, and the balance Fe and inevitable impurities) into an LD converter; then according to 950kg/tSteelThe molten iron charging proportion is that the following medium-high manganese, high phosphorus and low silicon molten iron is added into a 50-ton LD converter according to the following temperature and mass ratio: the temperature of molten iron is 1330 ℃, the components of the molten iron are C4.60wt%, Mn1.15wt%, Si 0.15wt%, P0.130wt%, S0.040wt%, and the balance of Fe and inevitable impurities.
B. The early smelting process comprises the following steps: step A, after charging high-manganese high-phosphorus low-silicon molten iron, scrap steel and pig iron cold charge into a 50-ton LD converter, shaking the converter front and back to expose the molten iron and then blowing the molten iron by an oxygen lance, wherein the ignition oxygen pressure is 0.80 MPa; after the ignition is successful, adding continuous casting slag with the granularity of 2-5mm and the following mass ratio from a high-level bunker according to the amount of 6.0kg/t steel:CaO 23.0%，SiO230.5%，MgO10.4%, Al2O32.5 percent of manganese dioxide, 9.7 percent of MnO, 0.078 percent of S, 0.025 percent of P, and the balance of Fe and inevitable impurities; blowing is started after the casting residue is fed, the alkalinity of the slag in the smelting process is controlled according to 2.4, the blowing is started for 20 seconds, the lance position of an oxygen lance is controlled according to 1.2m, the oxygen pressure is controlled according to 0.88MPa, and the oxygen pressure is controlled according to 3.0kg/tSteelAdding conventional active lime for slagging; blowing for 20-140 s, lowering the lance position of the oxygen lance to 0.9-1.0m, and controlling the oxygen pressure at 0.85MPa and 10.0kg/t respectivelySteel、11.5kg/tSteelAmount of BaCO added3A slag former (with the following mass ratio: BaCO)354.5 wt%，BaSO421.6 wt%，SiO219.7 wt%, Fe2O33.4 wt%, S0.085wt%, P0.068wt%, the balance of Fe and inevitable impurities), and 1.0kg/t of light-burned dolomite for slaggingSteelAdding the following slag melting agents in percentage by mass to promote slag melting: CaO 27.5%, Al2O35.2%，FeO 16.5%, Fe2O323.5 percent of Mn, 7.6 percent of Mn, 0.085 percent of S, and the balance of Fe and inevitable impurities; after the slag is taken off for 140 seconds, the lance position is timely increased to 1.1m, the blowing time is increased to 140-second, the oxygen pressure is controlled at 0.85MPa, and the lance position of the oxygen lance is controlled at 1.1-1.2m, respectively at 3.0kg/tSteelAmount of (2.0 kg/t)SteelIn an amount of BaCO3A slag former (with the following mass ratio: BaCO)354.5 wt%，BaSO421.6 wt%，SiO219.7 wt%, Fe2O33.4 wt%, S0.085wt%, p0.068wt%, and the balance of Fe and inevitable impurities) and magnesite balls.
C. The middle-stage smelting process comprises the following steps: b, blowing the molten steel to 250-400 seconds, controlling the oxygen pressure at 0.85MPa and controlling the lance position of the oxygen lance to be 1.0-1.1 m; blowing for 660 seconds at 400 ℃ and 85MPa, and controlling the oxygen pressure to be 0.85MPa and the lance position of the oxygen lance to be 1.1-1.2 m; when the blowing time is 660 seconds, the oxygen pressure is controlled according to 0.85MPa, the lance position of the oxygen lance is reduced to 0.8m, the oxygen lance is lifted and inverted for sampling after the lance position is pressed and deep blown for 20 seconds, and the temperature of inverted molten steel is controlled to be 1630 ℃, C is 0.20wt%, Mn is 0.60wt%, P is 0.032wt%, and S is 0.035 wt%.
D. The final stage process of converter smelting: c, after the molten steel is poured into the converter for sampling, the converter is shaken to continue blowing by an oxygen lance, the blowing is carried out to 660 seconds-tapping stage, the oxygen pressure is controlled according to 0.85MPa, the lance position of the oxygen lance is controlled according to 1.0m, and the end point tapping control requirement is as follows: the temperature is 1650 ℃, C0.15wt%, P0.030wt%, Mn0.55wt% and S0.033wt%.
E. The converter tapping process comprises the following steps: d, adding active lime into the bottom of the steel ladle for washing before tapping of molten steel, wherein the addition amount of lime is 2.0kg/tSteel(ii) a The whole bottom argon blowing process is adopted in the tapping process, and the flow rate of argon is controlled to be 30 NL/min; finally, obtaining the molten steel with the following weight percentages: c0.15wt%, P0.036wt%, Mn0.55wt%, S0.030wt%, and the balance Fe and unavoidable impurities.

Claims (10)

1. A converter smelting method for molten steel residual manganese at the end point of high-manganese high-phosphorus low-silicon iron water extraction is characterized by comprising the following process steps:
A. the smelting and charging process comprises the following steps: after the slag splashing of the steel tapping of the upper furnace is finished, retaining all the final slag in the converter according to the proportion of 4.0-5.0kg/tSteelAdding conventional active lime into the converter; according to the ratio of 55-70kg/tSteelThe scrap steel is added into a 50-ton LD converter according to the proportion; according to 50kg/tSteelCharging pig iron into a 50-ton LD converter according to a proportioning ratio; thereafter, 950-fold and 980kg/tSteelThe molten iron charging proportion is that the medium-high manganese high-phosphorus low-silicon molten iron with the following temperature and components is added into a 50-ton LD converter: the temperature of the molten iron is more than or equal to 1300 ℃, the components of the molten iron comprise 4.20-4.60wt% of C, 0.90-1.15wt% of Mn, 0.05-0.15wt% of Si, 0.100-0.130wt% of P, less than or equal to 0.040wt% of S, and the balance of Fe and inevitable impurities;
B. the early smelting process comprises the following steps: step A, after charging high-manganese high-phosphorus low-silicon molten iron, scrap steel and pig iron cold charge into a 50-ton LD converter, shaking the converter front and back to expose the molten iron and then blowing the molten iron by an oxygen lance, wherein the ignition oxygen pressure is 0.80 MPa; after ignition is successful, adding continuous casting slag with the granularity of 2-5mm from an overhead bin according to the amount of 5.0-6.0kg/t steel; blowing is started after the casting residue is fed, the alkalinity of the slag in the smelting process is controlled according to 2.0-2.4, the blowing is started for 20 seconds, the lance position of an oxygen lance is controlled according to 1.2m, the oxygen pressure is controlled according to 0.88MPa, and the oxygen pressure is controlled according to 2.0-3.0kg/tSteelAdding conventional active lime for slagging; blowing for 20-140 s, lowering the lance position of the oxygen lance to 0.9-1.0m, and controlling the oxygen pressure at 0.85MPa and 8.0-10.0kg/t respectivelySteel、9.0-11.5kg/tSteelAmount of BaCO added3Is composed of slag former and light-burned dolomite for slagging in a proportion of 1.0kg/tSteelAdding a slagging agent to promote slagging; after the slag is taken off for 140 seconds, the lance position is timely increased to 1.1m, the blowing time is increased to 140-second, the oxygen pressure is controlled at 0.85MPa, and the lance position of the oxygen lance is controlled at 1.1-1.2m, respectively at 2.0-3.0kg/tSteel1.0-2.0kg/tSteelIn an amount of BaCO3The slag former and the magnesite balls are used for slagging again;
C. the middle-stage smelting process comprises the following steps: b, blowing the molten steel to 250-400 seconds, controlling the oxygen pressure at 0.85MPa and controlling the lance position of the oxygen lance to be 1.0-1.1 m; blowing for 660 seconds at 400 ℃ and 85MPa, and controlling the oxygen pressure to be 0.85MPa and the lance position of the oxygen lance to be 1.1-1.2 m; when the blowing time is 660 seconds, controlling the oxygen pressure according to 0.85MPa, lowering the lance position of the oxygen lance to 0.8m, carrying out oxygen lance lifting and converter reversing sampling after deep blowing at the lance pressing position for 20 seconds, and controlling the converter reversing molten steel temperature to 1610-1630 ℃;
D. the final stage process of converter smelting: c, after the molten steel is poured out of the furnace and sampled, swinging the furnace to continue blowing by an oxygen lance, blowing till 660 seconds-tapping stage, controlling the oxygen pressure according to 0.85MPa, controlling the lance position of the oxygen lance according to 1.0m, and controlling the temperature of the molten steel tapped at the end point to be 1630-1650 ℃;
E. the converter tapping process comprises the following steps: d, adding active lime into the bottom of the steel ladle for washing before tapping of molten steel, wherein the addition amount of lime is 2.0kg/tSteel(ii) a A whole-process bottom argon blowing process is adopted in the tapping process, and the flow rate of argon is controlled to be 20-30 NL/min; finally, the smelting molten steel with improved residual manganese is obtained.
2. The converter smelting method of molten steel residual manganese at the end point of molten steel improvement of medium-high-manganese high-phosphorus low-silicon iron according to claim 1, characterized in that the scrap steel in the step A comprises the following components in percentage by mass: 0.20 to 0.26 weight percent of C, 0.35 to 0.50 weight percent of Si, 1.20 to 1.40 weight percent of Mn, 0.035 to 0.046 weight percent of P, 0.028 to 0.039 weight percent of S, and the balance of Fe and inevitable impurities.
3. The converter smelting method of molten steel residual manganese at the end point of aqueous upgrading of medium-high manganese, high phosphorus and low silicon iron as claimed in claim 1, wherein the pig iron in step A comprises the following components in percentage by mass: 3.3 to 3.6 weight percent of C, 0.30 to 0.50 weight percent of Si, 0.32 to 0.55 weight percent of Mn, 0.058 to 0.075 weight percent of P, 0.018 to 0.027 weight percent of S, and the balance of Fe and inevitable impurities.
4. The converter smelting method of molten steel residual manganese at the end point of aqueous extraction of medium-high manganese, high phosphorus and low silicon iron according to claim 1, characterized in that the continuous casting slag in the step B comprises the following components in percentage by mass: CaO 21.0-23.0%, SiO227.5-30.5%，MgO 8.9-10.4%, Al2O31.5-2.5%, MnO 8.8-9.7%, S0.065-0.078%, P0.018-0.025%, and the balance Fe and inevitable impurities.
5. The converter smelting method of molten steel residual manganese at the end point of aqueous extraction of medium-high manganese, high phosphorus and low silicon iron as claimed in claim 1, characterized in that said step B is carried out according to 8.0-10.0kg/tSteelMetered BaCO3The slag former comprises the following components in percentage by mass: BaCO354.5 wt%，BaSO421.6 wt%，SiO219.7 wt%, Fe2O33.4 wt%, S0.085wt%, P0.068wt%, and the balance Fe and inevitable impurities.
6. The converter smelting method of molten steel residual manganese at the end point of molten steel extraction by medium-high manganese, high phosphorus and low silicon iron according to claim 1, characterized in that the slagging agent in the step B comprises the following components in percentage by mass: CaO 27.5%, Al2O35.2%，FeO16.5%, Fe2O323.5%, MnO7.6%, S0.085%, and the balance of Fe and inevitable impurities.
7. The converter smelting method of molten steel residual manganese at the end point of aqueous extraction of medium-high manganese, high phosphorus and low silicon iron as claimed in claim 1, wherein said step B is performed at 2.0-3.0kg/tSteelIn an amount of BaCO3The slag former comprises the following components in percentage by mass: BaCO354.5 wt%，BaSO421.6 wt%，SiO219.7 wt%, Fe2O33.4 wt%, S0.085wt%, P0.068wt%, and the balance Fe and inevitable impurities.
8. The converter smelting method of molten steel residual manganese at the end point of high-manganese high-phosphorus low-silicon molten iron water improvement according to claim 1, characterized in that the composition requirements of the controlled converter molten steel in the step C are as follows: 0.12 to 0.20 weight percent of C, 0.47 to 0.60 weight percent of Mn, less than or equal to 0.032 weight percent of P, and less than or equal to 0.035 weight percent of S.
9. The converter smelting method for extracting molten steel residual manganese from high-manganese high-phosphorus low-silicon iron water at the end point of the improvement according to claim 1, wherein the composition requirements of the molten steel at the end point of the control in the step D are as follows: 0.08-0.15 wt% of C, less than or equal to 0.030wt% of P, 0.43-0.55wt% of Mn0.033 wt% of S.
10. The converter smelting method of molten steel residual manganese at the medium-high manganese, high phosphorus and low silicon iron water improvement end point according to claim 1, characterized in that the smelted molten steel with residual manganese improved in the step E has the following components in percentage by weight: 0.08 to 0.15 weight percent of C, less than or equal to 0.036 weight percent of P, 0.43 to 0.55 weight percent of Mn0.030 weight percent of S, and the balance of Fe and inevitable impurities.
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