CN114480774A - Method for smelting high-phosphorus molten iron by adopting limestone slagging process in converter - Google Patents

Method for smelting high-phosphorus molten iron by adopting limestone slagging process in converter Download PDF

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CN114480774A
CN114480774A CN202111589359.3A CN202111589359A CN114480774A CN 114480774 A CN114480774 A CN 114480774A CN 202111589359 A CN202111589359 A CN 202111589359A CN 114480774 A CN114480774 A CN 114480774A
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steel
converter
smelting
slagging
percent
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陈伟
邹应春
李金柱
周虎
刘林刚
速国武
者云川
熊龙权
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Wugang Group Kunming Iron and Steel Co Ltd
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Wugang Group Kunming Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/36—Processes yielding slags of special composition
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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

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

Abstract

The invention discloses a method for smelting high-phosphorus molten iron by a converter by adopting a limestone slagging process, which integrates and innovates a converter smelting charging system, an oxygen supply process, a slagging and slagging process, a temperature process, an end point control process and a tapping slag washing process to obtain good slagging dephosphorization and desulfurization effects, realizes slagging smelting by replacing active lime with low-price limestone, and reduces the slagging cost by 8 yuan/t compared with the conventional slagging processSteelAbove, the slagging is obviously reducedThe method improves the economic indexes of the smelting technology.

Description

Method for smelting high-phosphorus molten iron by adopting limestone slagging process in converter
Technical Field
The invention belongs to the technical field of metallurgical steelmaking, and particularly relates to a method for smelting high-phosphorus molten iron by a converter by adopting a limestone slagging process.
Background
Lime is the most important slagging raw material in steel-making production, and at present, the converter steel-making in China basically uses active lime for slagging smelting, and the active lime is required to have high activity, stable components, high CaO content and low S and SiO2 contents. At present, the converter smelting lime slagging steelmaking process firstly calcines limestone in a lime kiln to obtain active lime, and then adds the active lime into the converter for slagging steelmaking, so that the capital construction and production cost of the lime kiln are increased, and on the other hand, carbon dioxide and dust generated by limestone calcination are discharged, so that serious environmental pollution is caused, and the converter smelting lime slagging steelmaking process is not beneficial to environmental protection and treatment. In recent years, along with the increasing of environmental protection treatment force, the continuous promotion of carbon emission reduction and carbon neutralization in China, lime production enterprises with high energy consumption and serious pollution are continuously shut down and reduced, so that the production cost and price of lime are continuously increased, and finally, the production cost of steelmaking and slagging is continuously increased. Aiming at the situation, the development of the substitution research and application of the lime slagging material in the steelmaking converter is important and urgent.
At present, the relevant reports of research and production of slagging by using limestone instead of active lime in smelting of a steel converter are available in China, but most of the smelting is limited to the converter smelting of low-P molten iron with the following chemical components (0.40-0.60 wt% of Si, and P is less than or equal to 0.100wt%), for example, the invention patent 'a process for smelting stainless steel in a dephosphorization converter by using limestone', the limestone partially replaces lime to smelt the stainless steel in the dephosphorization converter, and the good bottom blowing stirring condition of the dephosphorization converter is utilized to realize the rapid melting of limestone, lime and iron oxide skin balls, so that the purpose of rapid dephosphorization is achieved; in another embodiment of the present invention, by using limestone for slagging, the splashing degree and incidence rate of the high-silicon molten iron at the initial stage of smelting and oxidizing are reduced, and a large amount of heat energy generated by silicon oxidation is utilized to decompose limestone into active lime at a high temperature, which becomes a necessary material for smelting and slagging in a converter, thereby reducing furnace charge consumption and improving the smelting yield and utilization rate of the high-silicon molten iron.
For example, in the prior art, most of the converters utilize an upper bin to add limestone blocks or limestone powder, and a series of problems of poor lime melting, large heat absorption capacity, low lime utilization rate, high slag consumption, large smelting slag amount, unsatisfactory dephosphorization effect and the like exist in the smelting process, so that the large-scale popularization and application of the process are restricted.
In view of the above problems, the present invention is directed to providing a method for smelting molten steel in a converter with high lime utilization using limestone instead of an active lime slagging process for high phosphorus molten iron having the following chemical compositions (Si 0.20-0.40wt%, P0.150-0.220 wt%).
Disclosure of Invention
The invention aims to provide a method for smelting high-phosphorus molten iron by adopting a limestone slagging process in a converter. The invention aims to realize the method for smelting the high-phosphorus molten iron by adopting a limestone slagging process in the converter, which is realized 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 weight of 18-22kg/tSteel，73-90kg/tSteel，40kg/tSteelSequentially adding limestone, scrap steel and pig iron to a 120-ton LD top-bottom combined blown converter; then 930-SteelThe molten iron charging ratio is that high-phosphorus molten iron with the following temperature and mass ratio is added into a 120-ton LD top-bottom combined blown converter: the temperature of molten iron is more than or equal to 1320 ℃, the components of the molten iron are 4.3-4.8wt%, Mn is 0.25-0.40wt%, Si is 0.25-0.45wt%, P is 0.150-0.220wt%, S is less than or equal to 0.040wt%, and the balance is inevitable impurities;
B. the early smelting process comprises the following steps: step A, after high-phosphorus molten iron, scrap steel and pig iron cold charge are loaded into a 120-ton LD top-bottom combined blowing converter, the converter is shaken front and back to ensure that the molten iron is exposed, then the molten iron is blown by an oxygen lance, the ignition oxygen pressure is 0.80MPa, and after ignition is successful, 2.0kg/t of cold charge is fed from a high-level storage binSteelAdding the continuous casting residue; blowing for 40-150 s, controlling oxygen pressure at 0.85MPa and oxygen lance position at 1.2-1.4m, respectively at 3.0-4.0kg/tSteel、7.0-9.0kg/tSteel、15.0-20.0kg/tSteelAdding limestone, conventional active lime and light-burned dolomite for slagging; at a rate of 2.0kg/tSteelAdding a slagging agent; after blowing for 150 seconds and slag removal, the lance position is timely increased to 1.5m, the blowing is carried out for 150 seconds and 300 seconds, the oxygen pressure is controlled at 0.85MPa, and the lance position of the oxygen lance is controlled at 1.5-1.6m, respectively at 4.0kg/tSteel、3.0-4.0kg/tSteelAdding conventional active lime and light burned dolomite for slagging and slagging; the slagging agent comprises the following chemical components in percentage by mass: CaO 18.5%, Al2O3 6.8%，FeO 15.7%，Fe2O3 26.5 percent, MnO 4.2 percent, S0.11 percent, P0.072 percent and the balance of inevitable impurities;
C. the middle-stage smelting process comprises the following steps: b, blowing the molten steel to 300-; blowing for 700 seconds to 500 ℃ and the pressure of oxygen is controlled at 0.88MPa, and the position of an oxygen lance is controlled at 1.2-1.3 m; when the blowing time is 700 seconds, controlling the oxygen pressure according to 0.85MPa, lowering the lance position of the oxygen lance to 1.1m, carrying out oxygen lance lifting and converter reversing sampling after deeply blowing for 35 seconds at the lance pressure position, and controlling the converter reversing molten steel temperature to 1590-1620 ℃;
D. the final stage process of converter smelting: c, after pouring and sampling the molten steel, shaking the furnace, continuing to blow by an oxygen lance, controlling the oxygen pressure to be 0.85MPa and the oxygen lance position to be 1.1-1.2m when the molten steel is blown to a stage of 760 seconds and tapping, and controlling the end point tapping temperature to be 1630-1650 ℃;
E. the converter tapping process comprises the following steps: d, the bottom of the ladle is 1.5kg/t before tapping of molten steelSteelAdding a slag washing desulfurizer into the mixture for slag washing; 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, obtaining target smelting molten steel;
wherein the limestone comprises 53.5% by mass of CaO and SiO21.65%, MgO 0.85%, P0.065%, S0.015%, and Fe and inevitable impurities in balance, and has a particle size of 10-40 mm.
The principle of the invention is as follows:
the invention adopts limestone slagging process to smelt high-phosphorus molten iron, and integrates and innovates the processes of full slag remaining operation, continuous casting residue application, constant-pressure gun changing operation in the smelting process, one-time-reversal lowest gun position gun pressing operation of a converter, whole slag washing of steel tapping and the like, thereby optimizing and improving the smelting reaction kinetics and thermodynamic conditions, promoting the quick slagging and slagging in the smelting process, obtaining good dephosphorization and desulfurization effects, realizing the slagging smelting of low-price limestone instead of active lime, obviously reducing the smelting slagging cost and improving the economic indexes of the smelting technology.
The invention has the beneficial effects that:
the method for smelting the high-phosphorus molten iron by adopting the limestone slagging process obtains good slagging dephosphorization and desulfurization effects by integrating and innovating a converter smelting charging system, an oxygen supply process, a slagging process, a temperature process, an end point control process and a tapping slag washing process, realizes slagging smelting by replacing active lime with low-price limestone, and reduces the slagging cost by 8 yuan/t compared with the conventional slagging processSteelTherefore, the slagging cost is obviously reduced, and the economic indexes of the smelting technology are improved.
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 method for smelting high-phosphorus molten iron by a converter by adopting a limestone slagging process, which is realized 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 weight of 18-22kg/tSteel，73-90kg/tSteel，40kg/tSteelSequentially adding limestone, scrap steel and pig iron to a 120-ton LD top-bottom combined blown converter; then 930-SteelThe molten iron charging ratio is that high-phosphorus molten iron with the following temperature and mass ratio is added into a 120-ton LD top-bottom combined blown converter: the temperature of molten iron is more than or equal to 1320 ℃, the components of the molten iron are 4.3-4.8wt%, Mn is 0.25-0.40wt%, Si is 0.25-0.45wt%, P is 0.150-0.220wt%, S is less than or equal to 0.040wt%, and the balance is inevitable impurities;
B. the early smelting process comprises the following steps: step A, after high-phosphorus molten iron, scrap steel and pig iron cold charge are loaded into a 120-ton LD top-bottom combined blowing converter, the converter is shaken front and back to ensure that the molten iron is exposed, then the molten iron is blown by an oxygen lance, the ignition oxygen pressure is 0.80MPa, and after ignition is successful, the molten iron is discharged from a high-level storage binAt a rate of 2.0kg/tSteelAdding the continuous casting residue; blowing for 40-150 s, controlling oxygen pressure at 0.85MPa and oxygen lance position at 1.2-1.4m, respectively at 3.0-4.0kg/tSteel、7.0-9.0kg/tSteel、15.0-20.0kg/tSteelAdding limestone, conventional active lime and light-burned dolomite for slagging; at a rate of 2.0kg/tSteelAdding a slagging agent; after blowing for 150 seconds and slag removal, the lance position is timely increased to 1.5m, the blowing is carried out for 150 seconds and 300 seconds, the oxygen pressure is controlled at 0.85MPa, and the lance position of the oxygen lance is controlled at 1.5-1.6m, respectively at 4.0kg/tSteel、3.0-4.0kg/tSteelAdding conventional active lime and light burned dolomite for slagging and slagging; the slagging agent comprises the following chemical components in percentage by mass: CaO 18.5%, Al2O3 6.8%，FeO 15.7%，Fe2O3 26.5 percent, MnO 4.2 percent, S0.11 percent, P0.072 percent and the balance of inevitable impurities;
C. the middle-stage smelting process comprises the following steps: b, blowing the molten steel to 300-; blowing for 700 seconds to 500 ℃ and the pressure of oxygen is controlled at 0.88MPa, and the position of an oxygen lance is controlled at 1.2-1.3 m; when the blowing time is 700 seconds, controlling the oxygen pressure according to 0.85MPa, lowering the lance position of the oxygen lance to 1.1m, carrying out oxygen lance lifting and converter reversing sampling after deeply blowing for 35 seconds at the lance pressure position, and controlling the converter reversing molten steel temperature to 1590-1620 ℃;
D. the final stage process of converter smelting: c, after the molten steel is poured into the converter for sampling, shaking the converter to continue blowing by an oxygen lance, controlling the oxygen pressure to be 0.85MPa and the lance position of the oxygen lance to be 1.1-1.2m when the molten steel is blown to a 760 second-tapping stage, and controlling the end-point tapping temperature to be 1630-1650 ℃;
E. the converter tapping process comprises the following steps: d, the bottom of the ladle is 1.5kg/t before tapping of molten steelSteelAdding a slag washing desulfurizer into the mixture for slag washing; 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 target smelting molten steel is obtained.
The limestone comprises 53.5 percent of CaO and SiO by mass21.65%, MgO 0.85%, P0.065%, S0.015%, the rest is Fe and inevitable impurities, the grain size is 10-40 mm.
The mass ratio of chemical components of the scrap steel in the step A is as follows: 0.21-0.25wt% of C, 0.30-0.55wt% of Si, 1.15-1.50wt% of Mn, 0.020-0.035wt% of P, 0.020-0.036wt% of S, and the balance of Fe and inevitable impurities.
The pig iron in the step A comprises the following chemical components in percentage by mass: 3.4 to 3.8 weight percent of C, 0.25 to 0.45 weight percent of Si, 0.25 to 0.45 weight percent of Mn, 0.080 to 0.098 weight percent of P, 0.026 to 0.042 weight percent of S, and the balance of Fe and inevitable impurities.
The chemical components of the continuous casting residue in the step B are in mass ratio as follows: CaO 23.0%, SiO2 41.0%，MgO 7.5%, Al2O3 5.7 percent of manganese oxide (MnO) and 9.2 percent of manganese oxide (MnO), and the balance of Fe and inevitable impurities, and the particle size is 5-20 mm.
The conventional active lime in the step B comprises the following chemical components in percentage by mass: CaO 88.7%, SiO21.85 percent, 3.45 percent of MgO, 0.085 percent of P, 0.065 percent of S and the balance of inevitable impurities, and the granularity is 10-50 mm.
The light calcined dolomite in the step B comprises the following chemical components in percentage by mass: 26.8% of MgO, 46.5% of CaO, and SiO21.05%, P0.045%, S0.018%, and the balance of inevitable impurities, and the particle size is 20-50 mm.
And C, the converter molten steel comprises the following components: 0.15-0.30 wt% of C, less than or equal to 0.028wt% of P, and less than or equal to 0.025wt% of S.
And D, the tapping molten steel in the step D has the following composition requirements: 0.08-0.14 wt% of C, 0.10-0.15wt% of Mn, less than or equal to 0.025wt% of P, and less than or equal to 0.023wt% of S.
The mass ratio of the chemical components of the slag washing desulfurizer in the step E is as follows: CaF2 5.8wt%，SiO2 7.5wt%，CaO 57.5wt%，Na29.5wt% of O, 2.8wt% of Al, 0.056wt% of P, 0.082wt% of S and the balance of inevitable impurities.
The target smelting molten steel in the step E comprises the following components in percentage by weight: 0.08 to 0.14 weight percent of C, 0.10 to 0.15 weight percent of Mn, less than or equal to 0.025 weight percent of P, less than or equal to 0.020 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, retaining all the final slag in the converter according to the ratio of 18kg/tSteelAdding limestone with a particle size of 10-40mm in the following mass ratio to the converter: CaO 53.5%, SiO21.65%, MgO 0.85%, P0.065%, S0.015%, the rest is Fe and inevitable impurities; according to 90kg/tSteelThe steel scrap charging proportion is that the following steel scrap is added into a 120-ton LD top-bottom combined blown converter in mass ratio: 0.21wt% of C, 0.30wt% of Si, 1.15wt% of Mn, 0.020wt% of P, 0.020wt% of S, and the balance of Fe and inevitable impurities; at 40kg/tSteelThe pig iron charging proportion is that the pig iron with the following mass ratio is added into a 120-ton LD top-bottom combined blown converter: 3.4wt% of C, 0.25wt% of Si, 0.25wt% of Mn, 0.080wt% of P, 0.026wt% of S and the balance of Fe and inevitable impurities; then according to 930kg/tSteelThe molten iron charging ratio is that high-phosphorus molten iron with the following temperature and mass ratio is added into a 120-ton LD top-bottom combined blown converter: the temperature of the molten iron is 1350 ℃, the components of the molten iron are C4.3 wt%, Mn 0.25wt%, Si 0.25wt%, P0.150 wt%, S0.025 wt%, and the balance is inevitable impurities.
B. The early smelting process comprises the following steps: step A, after high-phosphorus molten iron, scrap steel and pig iron cold charge are loaded into a 120-ton LD top-bottom combined blowing converter, the converter is shaken front and back to ensure that the molten iron is exposed, then the molten iron is blown by an oxygen lance, the ignition oxygen pressure is 0.80MPa, and after ignition is successful, 2.0kg/t of cold charge is fed from a high-level storage binSteelAdding continuous casting slag with the following mass ratio of 5-20mm of granularity: CaO 23.0%, SiO2 41.0%，MgO 7.5%，Al2O3 5.7 percent of manganese oxide (MnO) 9.2 percent, and the balance of Fe and inevitable impurities; blowing for 40-150 s, controlling oxygen pressure at 0.85MPa and oxygen lance position at 1.2-1.4m, respectively at 3.0kg/tSteel、7.0kg/tSteel、15.0kg/tSteelAdding limestone with the following mass ratio, the particle size of which is 10-40 mm: CaO 53.5%, SiO21.65%, MgO 0.85%, P0.065%, S0.015%, the rest is inevitable impurity; active lime with the following mass ratio with the granularity of 10-50 mm: CaO 88.7%, SiO21.85 percent, 3.45 percent of MgO, 0.085 percent of P, 0.065 percent of S and the balance of inevitable impurities; light-burned dolomite with the granularity of 20-50mm and the following mass ratio: 19.3 percent of MgO, 32.5 percent of CaO, and SiO21.05 percent, P0.045 percent, S0.018 percent and the balance of inevitable impurity slagging; at a rate of 2.0kg/tSteelAdding the following slag melting agents in percentage by mass: CaO 18.5%, Al2O3 6.8%，FeO 15.7%，Fe2O3 26.5 percent, MnO 4.2 percent, S0.11 percent, P0.072 percent and the balance of inevitable impurities; after blowing for 150 seconds and slag removal, the lance position is timely increased to 1.5m, the blowing is carried out for 150 seconds and 300 seconds, the oxygen pressure is controlled at 0.85MPa, and the lance position of the oxygen lance is controlled at 1.5-1.6m, respectively at 4.0kg/tSteel、3.0kg/tSteelAdding conventional active lime (granularity of 10-50mm, chemical component mass ratio of CaO 88.7%, SiO)21.85 percent, 3.45 percent of MgO, 0.085 percent of P, 0.065 percent of S and the balance of inevitable impurities, and light-burned dolomite (the granularity is 20-50m, the mass ratio of the chemical components is 19.3 percent of MgO, 32.5 percent of CaO and SiO)21.05%, P0.045%, S0.018%, and the balance unavoidable impurities).
C. The middle-stage smelting process comprises the following steps: b, blowing the molten steel to 300-; blowing for 700 seconds to 500 ℃ and the pressure of oxygen is controlled at 0.88MPa, and the position of an oxygen lance is controlled at 1.2-1.3 m; when the blowing time is 700 seconds, the oxygen pressure is controlled according to 0.85MPa, the lance position of the oxygen lance is reduced to 1.1m, the oxygen lance is lifted and inverted for sampling after the lance position is pressed for deep blowing for 35 seconds, and the temperature of inverted molten steel is controlled to be 1590 ℃, C is 0.30wt%, P is 0.018wt% and S is 0.016%.
D. The final stage process of converter smelting comprises the following steps: 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 a stage of 760 seconds and steel tapping, the oxygen pressure is controlled according to 0.85MPa, the position of the oxygen lance is controlled according to 1.1-1.2m, and the end point steel tapping control requirement is as follows: the temperature was 1630 ℃, C0.08 wt%, Mn0.10 wt%, P0.016 wt%, S0.014 wt%.
E. The converter tapping process comprises the following steps: d, the bottom of the ladle is 1.5kg/t before tapping of molten steelSteelAdding the following slag washing desulfurizing agent in the following mass ratio for slag washing: CaF2 5.8wt%，SiO2 7.5wt%，CaO 57.5wt%，Na29.5wt% of O, 2.8wt% of Al, 0.056wt% of P, 0.082wt% of S and the balance of inevitable impurities; 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: 0.08wt% of C, 0.10wt% of Mn, 0.016wt% of P, 0.012wt% of S, and the balance Fe and inevitable impurities.
Example 2
A. Smelting charging process: 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 20kg/tSteelAdding limestone with a particle size of 10-40mm in the following mass ratio to the converter: CaO 53.5%, SiO21.65%, MgO 0.85%, P0.065%, S0.015%, the rest is Fe and inevitable impurities; according to 82kg/tSteelThe steel scrap charging proportion is that the following steel scrap is added into a 120-ton LD top-bottom combined blown converter in mass ratio: 0.23wt% of C, 0.42wt% of Si, 1.32wt% of Mn, 0.028wt% of P, 0.027wt% of S, and the balance of Fe and inevitable impurities; at 40kg/tSteelThe pig iron charging proportion is that the pig iron with the following mass ratio is added into a 120-ton LD top-bottom combined blown converter: 3.6 wt% of C, 0.35wt% of Si, 0.35wt% of Mn, 0.088wt% of P, 0.037wt% of S, and the balance of Fe and inevitable impurities; then 940kg/tSteelThe molten iron charging ratio is that high-phosphorus molten iron with the following temperature and mass ratio is added into a 120-ton LD top-bottom combined blown converter: the temperature of molten iron is 1330 ℃, the components of the molten iron are 4.5wt percent of C, 0.32wt percent of Mn, 0.35wt percent of Si, 0.185wt percent of P, 0.032wt percent of S and the balance of inevitable impurities.
B. The early smelting process comprises the following steps: step A, after high-phosphorus molten iron, scrap steel and pig iron cold charge are loaded into a 120-ton LD top-bottom combined blowing converter, the converter is shaken front and back to ensure that the molten iron is exposed, then the molten iron is blown by an oxygen lance, the ignition oxygen pressure is 0.80MPa, and after ignition is successful, 2.0kg/t of cold charge is fed from a high-level storage binSteelAdding continuous casting slag with the grain size of 5-20mm and the following mass ratio: CaO 23.0%, SiO2 41.0%，MgO 7.5%，Al2O3 5.7 percent of manganese oxide (MnO) 9.2 percent, and the balance of Fe and inevitable impurities; blowing for 40-150 s, controlling oxygen pressure at 0.85MPa and oxygen lance position at 1.2-1.4m, respectively at 3.6kg/tSteel、8.0kg/tSteel、18.0kg/tSteelAdding limestone with the following mass ratio, the particle size of which is 10-40 mm: CaO 53.5%, SiO21.65%, MgO 0.85%, P0.065%, S0.015%, the rest is inevitable impurity; active lime with the following mass ratio with the granularity of 10-50 mm: CaO 88.7%, SiO21.85 percent, 3.45 percent of MgO, 0.085 percent of P, 0.065 percent of S and the balance of inevitable impurities; light-burned dolomite with the granularity of 20-50mm and the following mass ratio: 19.3 percent of MgO, 32.5 percent of CaO, and SiO2 1.05%， P 0.045 percent of S, 0.018 percent of S and the balance of inevitable impurity slagging; at a rate of 2.0kg/tSteelAdding the following slag melting agents in percentage by mass: CaO 18.5%, Al2O3 6.8%，FeO 15.7%，Fe2O3 26.5 percent, MnO 4.2 percent, S0.11 percent, P0.072 percent and the balance of inevitable impurities; after blowing for 150 seconds and slag removal, the lance position is timely increased to 1.5m, the blowing is carried out for 150 seconds and 300 seconds, the oxygen pressure is controlled at 0.85MPa, and the lance position of the oxygen lance is controlled at 1.5-1.6m, respectively at 4.0kg/tSteel、3.5kg/tSteelAdding conventional active lime (granularity of 10-50mm, chemical component mass ratio of CaO 88.7%, SiO)21.85 percent, 3.45 percent of MgO, 0.085 percent of P, 0.065 percent of S and the balance of inevitable impurities, and light-burned dolomite (the granularity is 20-50m, the mass ratio of the chemical components is 19.3 percent of MgO, 32.5 percent of CaO and SiO)21.05%, P0.045%, S0.018%, and the balance unavoidable impurities).
C. The middle-stage smelting process comprises the following steps: b, blowing the molten steel to 300-; blowing for 700 seconds to 500 ℃ and the pressure of oxygen is controlled at 0.88MPa, and the position of an oxygen lance is controlled at 1.2-1.3 m; when the blowing time is 700 seconds, the oxygen pressure is controlled according to 0.85MPa, the lance position of the oxygen lance is reduced to 1.1m, the oxygen lance is lifted and inverted for sampling after the lance position is pressed and deep blown for 35 seconds, and the temperature of inverted molten steel is controlled to be 1605 ℃, C0.21 wt%, P0.022 wt% and S0.020%.
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 a stage of 760 seconds and steel tapping, the oxygen pressure is controlled according to 0.85MPa, the position of the oxygen lance is controlled according to 1.1-1.2m, and the end point steel tapping control requirement is as follows: the temperature is 1640 ℃, 0.11wt% of C, 0.12wt% of Mn, 0.020wt% of P and 0.018wt% of S.
E. The converter tapping process comprises the following steps: d, the bottom of the ladle is 1.5kg/t before tapping of molten steelSteelAdding the following slag washing desulfurizing agent in the following mass ratio for slag washing: CaF2 5.8wt%，SiO2 7.5wt%，CaO 57.5wt%，Na29.5wt% of O, 2.8wt% of Al, 0.056wt% of P, 0.082wt% of S and the balance of inevitable impurities; 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: c0.10 wt%, Mn 0.12wt%, P0.020 wt%, S0.016 wt%, and Fe and inevitable impurities as the rest.
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 22kg/tSteelAdding limestone with a particle size of 10-40mm in the following mass ratio to the converter: CaO 53.5%, SiO21.65%, MgO 0.85%, P0.065%, S0.015%, the rest is Fe and inevitable impurities; according to 73kg/tSteelThe steel scrap charging proportion is that the following steel scrap is added into a 120-ton LD top-bottom combined blown converter in mass ratio: 0.25wt% of C, 0.55wt% of Si, 1.50wt% of Mn, 0.035wt% of P, 0.036wt% of S, and the balance of Fe and inevitable impurities; at 40kg/tSteelThe pig iron charging proportion is that the pig iron with the following mass ratio is added into a 120-ton LD top-bottom combined blown converter: 3.8 wt% of C, 0.45wt% of Si, 0.45wt% of Mn, 0.098wt% of P, 0.042wt% of S, and the balance of Fe and inevitable impurities; then according to 950kg/tSteelThe molten iron charging ratio is that high-phosphorus molten iron with the following temperature and mass ratio is added into a 120-ton LD top-bottom combined blown converter: the temperature of molten iron is 1320 ℃, the components of the molten iron are C4.8 wt%, Mn 0.40wt%, Si 0.45wt%, P0.220 wt%, S0.040 wt%, and the balance is inevitable impurities.
B. The early smelting process comprises the following steps: step A, after high-phosphorus molten iron, scrap steel and pig iron cold charge are loaded into a 120-ton LD top-bottom combined blowing converter, the converter is shaken front and back to ensure that the molten iron is exposed, then the molten iron is blown by an oxygen lance, the ignition oxygen pressure is 0.80MPa, and after ignition is successful, 2.0kg/t of cold charge is fed from a high-level storage binSteelAdding continuous casting slag with the grain size of 5-20mm and the following mass ratio: CaO 23.0%, SiO2 41.0%，MgO 7.5%，Al2O3 5.7 percent of manganese oxide (MnO) 9.2 percent, and the balance of Fe and inevitable impurities; blowing for 40-150 s, controlling oxygen pressure at 0.85MPa and oxygen lance position at 1.2-1.4m, respectively at 4.0kg/tSteel、9.0kg/tSteel、20.0kg/tSteelAdding limestone with the following mass ratio, the particle size of which is 10-40 mm: CaO 53.5%, SiO21.65%, MgO 0.85%, P0.065%, S0.015%, the rest is inevitable impurity; active lime with the following mass ratio with the granularity of 10-50 mm: CaO 88.7%, SiO2 1.85%，3.45 percent of MgO, 0.085 percent of P, 0.065 percent of S and the balance of inevitable impurities; light-burned dolomite with the granularity of 20-50mm and the following mass ratio: 19.3 percent of MgO, 32.5 percent of CaO, and SiO21.05 percent, P0.045 percent, S0.018 percent and the balance of inevitable impurity slagging; at a rate of 2.0kg/tSteelAdding the following slag melting agents in percentage by mass: CaO 18.5%, Al2O3 6.8%，FeO 15.7%，Fe2O3 26.5 percent, MnO 4.2 percent, S0.11 percent, P0.072 percent and the balance of inevitable impurities; after blowing for 150 seconds and slag removal, the lance position is timely increased to 1.5m, the blowing is carried out for 150 seconds and 300 seconds, the oxygen pressure is controlled at 0.85MPa, and the lance position of the oxygen lance is controlled at 1.5-1.6m, respectively at 4.0kg/tSteel、4.0kg/tSteelAdding conventional active lime (granularity of 10-50mm, chemical component mass ratio of CaO 88.7%, SiO)21.85 percent, 3.45 percent of MgO, 0.085 percent of P, 0.065 percent of S and the balance of inevitable impurities, and light-burned dolomite (the granularity is 20-50m, the mass ratio of the chemical components is 19.3 percent of MgO, 32.5 percent of CaO and SiO)21.05%, P0.045%, S0.018%, and the balance unavoidable impurities).
C. The middle-stage smelting process comprises the following steps: b, blowing the molten steel to 300-; blowing for 700 seconds to 500 ℃ and the pressure of oxygen is controlled at 0.88MPa, and the position of an oxygen lance is controlled at 1.2-1.3 m; when the blowing time is 700 seconds, the oxygen pressure is controlled according to 0.85MPa, the lance position of the oxygen lance is reduced to 1.1m, the lance position is pressed for deep blowing for 35 seconds, then the oxygen lance is lifted and inverted for sampling, and the temperature of inverted molten steel is controlled to be 1620 ℃, C is 0.15wt%, P is 0.028wt%, and S is 0.025%.
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 a stage of 760 seconds and steel tapping, the oxygen pressure is controlled according to 0.85MPa, the position of the oxygen lance is controlled according to 1.1-1.2m, and the end point steel tapping control requirement is as follows: the temperature is 1650 ℃, C0.14 wt%, Mn 0.15wt%, P0.025 wt%, S0.023 wt%.
E. The converter tapping process comprises the following steps: d, the bottom of the ladle is 1.5kg/t before tapping of molten steelSteelAdding the following slag washing desulfurizing agent in the following mass ratio for slag washing: CaF2 5.8wt%，SiO2 7.5wt%，CaO 57.5wt%，Na2O 9.5wt%，Al 2.8wt%，P 0.056wt%，S 0.082wt%, the rest is inevitable impurity; 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: 0.14wt% of C, 0.15wt% of Mn, 0.025wt% of P, 0.020wt% of S, and the balance Fe and inevitable impurities.
Examples 1 to 3 of the present invention are carried out to smelt high phosphorus molten steel in a converter, and low-priced limestone is used to substitute active lime for slagging in the smelting process, so as to realize converter smelting of high phosphorus molten iron having the following chemical components (Si 0.20-0.40wt%, P0.150-0.220 wt%), obtain significant dephosphorization and desulfurization effects, and reduce slagging cost by 8 yuan/t compared with the conventional slagging processSteelAbove, the slagging cost is greatly reduced.

Claims (10)

1. A method for smelting high-phosphorus molten iron by adopting a limestone slagging process in a converter is characterized by comprising the following process steps of:
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 weight of 18-22kg/tSteel，73-90kg/tSteel，40kg/tSteelSequentially adding limestone, scrap steel and pig iron to a 120-ton LD top-bottom combined blown converter; then 930-SteelThe molten iron charging ratio is that high-phosphorus molten iron with the following temperature and mass ratio is added into a 120-ton LD top-bottom combined blown converter: the temperature of molten iron is more than or equal to 1320 ℃, the components of the molten iron are 4.3-4.8wt%, Mn is 0.25-0.40wt%, Si is 0.25-0.45wt%, P is 0.150-0.220wt%, S is less than or equal to 0.040wt%, and the balance is inevitable impurities;
B. the early smelting process comprises the following steps: step A, after high-phosphorus molten iron, scrap steel and pig iron cold charge are loaded into a 120-ton LD top-bottom combined blowing converter, the converter is shaken front and back to ensure that the molten iron is exposed, then the molten iron is blown by an oxygen lance, the ignition oxygen pressure is 0.80MPa, and after ignition is successful, 2.0kg/t of cold charge is fed from a high-level storage binSteelAdding the continuous casting residue; blowing for 40-150 s, controlling oxygen pressure at 0.85MPa and oxygen lance position at 1.2-1.4m, respectively at 3.0-4.0kg/tSteel、7.0-9.0kg/tSteel、15.0-20.0kg/tSteelAdding limestone, conventional active lime and light-burned dolomite for slagging; at a rate of 2.0kg/tSteelAmount of (A) to be addedA slag agent; after blowing for 150 seconds and slag removal, the lance position is timely increased to 1.5m, the blowing is carried out for 150 seconds and 300 seconds, the oxygen pressure is controlled at 0.85MPa, and the lance position of the oxygen lance is controlled at 1.5-1.6m, respectively at 4.0kg/tSteel、3.0-4.0kg/tSteelAdding conventional active lime and light burned dolomite for slagging and slagging; the slagging agent comprises the following chemical components in percentage by mass: CaO 18.5%, Al2O3 6.8%，FeO 15.7%, Fe2O3 26.5 percent, MnO 4.2 percent, S0.11 percent, P0.072 percent and the balance of inevitable impurities;
C. the middle-stage smelting process comprises the following steps: b, blowing the molten steel to 300-; blowing for 700 seconds to 500 ℃ and the pressure of oxygen is controlled at 0.88MPa, and the position of an oxygen lance is controlled at 1.2-1.3 m; when the blowing time is 700 seconds, controlling the oxygen pressure according to 0.85MPa, lowering the lance position of the oxygen lance to 1.1m, carrying out oxygen lance lifting and converter reversing sampling after deeply blowing for 35 seconds at the lance pressure position, and controlling the converter reversing molten steel temperature to 1590-1620 ℃;
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, controlling the oxygen pressure to be 0.85MPa and the oxygen lance position to be 1.1-1.2m when the molten steel is blown to the 760 seconds-tapping stage, 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, the bottom of the ladle is 1.5kg/t before tapping of molten steelSteelAdding a slag washing desulfurizer into the mixture for slag washing; 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 target smelting molten steel is obtained.
2. The method for smelting high-phosphorus molten iron by adopting the limestone slagging process in the converter according to claim 1, wherein the limestone comprises the following chemical components in percentage by mass: CaO 53.5%, SiO21.65%, MgO 0.85%, P0.065%, S0.015%, the rest is Fe and inevitable impurities, the grain size is 10-40 mm.
3. The method for smelting the high-phosphorus molten iron by the converter according to the claim 1 and adopting the limestone slagging process is characterized in that in the step A,
the scrap steel comprises the following chemical components in percentage by mass: 0.21-0.25wt% of C, 0.30-0.55wt% of Si, 1.15-1.50wt% of Mn, 0.020-0.035wt% of P, 0.020-0.036wt% of S, and the balance of Fe and inevitable impurities;
the pig iron comprises the following chemical components in percentage by mass: 3.4 to 3.8 weight percent of C, 0.25 to 0.45 weight percent of Si, 0.25 to 0.45 weight percent of Mn, 0.080 to 0.098 weight percent of P, 0.026 to 0.042 weight percent of S, and the balance of Fe and inevitable impurities.
4. The method for smelting high-phosphorus molten iron by adopting the limestone slagging process in the converter according to claim 1, wherein the chemical components of the continuous casting residue in the step B are as follows by mass: CaO 23.0%, SiO2 41.0%，MgO 7.5%, Al2O3 5.7 percent of manganese oxide (MnO) and 9.2 percent of manganese oxide (MnO), and the balance of Fe and inevitable impurities, and the particle size is 5-20 mm.
5. The method for smelting high-phosphorus molten iron by adopting the limestone slagging process in the converter according to claim 1, wherein the mass ratio of the chemical components of the conventional active lime in the step B is as follows: CaO 88.7%, SiO21.85 percent, 3.45 percent of MgO, 0.085 percent of P, 0.065 percent of S and the balance of inevitable impurities, and the granularity is 10-50 mm.
6. The method for smelting the high-phosphorus molten iron by adopting the limestone slagging process in the converter according to claim 1, wherein the weight ratio of the chemical components of the light-burned dolomite in the step B is as follows: 26.8% of MgO, 46.5% of CaO, and SiO21.05%, P0.045%, S0.018%, and the balance of inevitable impurities, and the particle size is 20-50 mm.
7. The method for smelting high-phosphorus molten iron by adopting the limestone slagging process in the converter according to claim 1, wherein the composition requirements of the converter-reversing molten steel in the step C are as follows: 0.15-0.30 wt% of C, less than or equal to 0.028wt% of P, and less than or equal to 0.025wt% of S.
8. The method for smelting the high-phosphorus molten iron by adopting the limestone slagging process in the converter according to claim 1, wherein the molten steel tapping in the step D comprises the following components: 0.08-0.14 wt% of C, 0.10-0.15wt% of Mn0.025 wt% or less of P, and 0.023wt% or less of S.
9. The method for smelting high-phosphorus molten iron by adopting the limestone slagging process in the converter according to claim 1, wherein the mass ratio of the chemical components of the slag washing desulfurizer in the step E is as follows: CaF2 5.8wt%，SiO2 7.5wt%，CaO 57.5wt%，Na29.5wt% of O, 2.8wt% of Al, 0.056wt% of P, 0.082wt% of S and the balance of inevitable impurities.
10. The method for smelting high-phosphorus molten iron by adopting a limestone slagging process in the converter according to claim 1, wherein the target smelting molten steel in the step E comprises the following components in percentage by weight: 0.08 to 0.14 weight percent of C, 0.10 to 0.15 weight percent of Mn, less than or equal to 0.025 weight percent of P, less than or equal to 0.020 weight percent of S, and the balance of Fe and inevitable impurities.
CN202111589359.3A 2021-12-23 2021-12-23 Method for smelting high-phosphorus molten iron by adopting limestone slagging process in converter Pending CN114480774A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002275521A (en) * 2001-03-15 2002-09-25 Nippon Steel Corp Method for dephosphorizing molten high carbon steel
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
CN105779682A (en) * 2016-03-16 2016-07-20 甘肃酒钢集团宏兴钢铁股份有限公司 Process for smelting stainless steel in dephosphorization converter by using limestone
CN109161634A (en) * 2018-09-30 2019-01-08 武钢集团昆明钢铁股份有限公司 The low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in a kind of converter smelting
CN110373511A (en) * 2019-07-17 2019-10-25 邯郸钢铁集团有限责任公司 A kind of converter smelting process of low lime consumption

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002275521A (en) * 2001-03-15 2002-09-25 Nippon Steel Corp Method for dephosphorizing molten high carbon steel
CN105779682A (en) * 2016-03-16 2016-07-20 甘肃酒钢集团宏兴钢铁股份有限公司 Process for smelting stainless steel in dephosphorization converter by using limestone
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
CN109161634A (en) * 2018-09-30 2019-01-08 武钢集团昆明钢铁股份有限公司 The low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in a kind of converter smelting
CN110373511A (en) * 2019-07-17 2019-10-25 邯郸钢铁集团有限责任公司 A kind of converter smelting process of low lime consumption

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