CN114540567B - Technological method for recycling residual steel slag of continuous casting ladle in converter tapping - Google Patents
Technological method for recycling residual steel slag of continuous casting ladle in converter tapping Download PDFInfo
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- CN114540567B CN114540567B CN202210222973.4A CN202210222973A CN114540567B CN 114540567 B CN114540567 B CN 114540567B CN 202210222973 A CN202210222973 A CN 202210222973A CN 114540567 B CN114540567 B CN 114540567B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/44—Consumable closure means, i.e. closure means being used only once
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention belongs to the technical field of continuous casting in the ferrous metallurgy industry, and mainly relates to a process method for recycling residual steel slag of a continuous casting ladle in converter tapping, in particular to a process method for recycling residual heat state steel slag poured in the ladle after pouring is completed by 3-5 tons in the ladle during converter tapping; the molten steel slag in a molten state is left in the ladle without pouring into a slag basin, the ladle is directly hoisted into a special base station for hot repair by a crown block, and a ladle drainage rod is arranged at a ladle nozzle; adding hot high-manganese iron into the residual ladle before tapping to carry out a deoxidization process; directly carrying out power supply treatment after refining, and carrying out primary desulfurization and ladle heating by using hot residual steel slag; in a word, the invention can recycle the residual heat state slag of continuous casting ladle casting, fully utilize the residual steel and the residue, greatly improve the production efficiency, reduce the consumption of auxiliary materials and reduce the steelmaking production cost.
Description
Technical Field
The invention belongs to the technical field of continuous casting in the ferrous metallurgy industry, and mainly relates to a process method for recycling residual steel slag of continuous casting ladle in converter tapping.
Background
In the steelmaking production process, the steel ladle is poured in a continuous casting machine, after the molten steel in the steel ladle is poured, a steel ladle nozzle is closed, ladle slag is prevented from entering a tundish to pollute the molten steel, and the cleanliness of the molten steel is affected, so that a certain amount of thermal steel slag is required to remain in the steel ladle, and the conventional treatment process is to pour the steel slag into a slag basin, transport the steel slag to a steel slag workshop for treatment, and reuse or waste use after treatment.
The conventional casting steel slag treatment technology at present has the following defects:
(1) pouring the hot steel slag of the continuous casting ladle into a slag basin, so that not only is the iron loss lost, but also the recycling rate is low;
(2) pouring residual steel and residues in the steel ladle, wherein the temperature is up to 1500 ℃, and the heat of the residual steel and residues is not fully utilized;
(3) in the residues in the steel ladle, the alkalinity and CaO content are high, and the desulfurization capability of the residues is not fully utilized.
The steel slag recycling technology mainly comprises the following two modes:
(1) pouring the hot slag after pouring the steel ladle into the rest empty steel ladle, recovering the residual molten steel for secondary refining, and the main problem is that the production rhythm is influenced and the production organization is not facilitated.
(2) Pouring the hot slag after the ladle pouring into the ladle, and adding into the converter before the converter smelting starts, wherein the defect is that the secondary oxidation can cause low yield and increase the production cost.
Chinese patent CN201611212587.8 discloses a method for recovering and operating ladle casting residue converter, which solves the problems of recovering and reutilizing slag former and residual steel in ladle casting residue, but has the disadvantages of adding solid casting residue steel slag in converter smelting, easily causing converter splashing and low iron recovery rate.
Disclosure of Invention
The invention provides a process method for recycling the casting residual steel slag of the continuous casting ladle in converter tapping to solve the technical problems in the prior art, realizes the recycling of the hot casting residual steel slag, reduces the slag cost of a refining process, has high primary slag forming speed, and has great economic and social benefits in the steelmaking production process.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a process method for recycling residual steel slag of continuous casting ladle in converter tapping mainly comprises the following steps:
s1, when the casting of the molten steel of the continuous casting ladle is finished, the total amount of the residual molten steel and steel slag left in the ladle is 3-5 tons, wherein the residual slag is 60-75wt% and the residual steel is 25-40wt%;
s2, omitting the conventional steel slag pouring operation, directly lifting the steel ladle containing the molten hot residual steel slag to a base station special for hot repair, and replacing relevant refractory materials of a steel ladle tapping hole;
s3, adjusting the included angle range between the ladle nozzle and the horizontal plane by utilizing the special hot repair base according to the weight of the ladle casting residues, so as to prevent the casting residues from overflowing from the ladle nozzle;
s4, cleaning and replacing the slide plate mechanism; cleaning or replacing the sliding plate and the ladle nozzle; cleaning a ladle opening; hot repair; after the steps are finished, installing a ladle drainage rod at a ladle nozzle;
s5, hoisting the ladle filled with the molten thermal state residual steel slag to a converter tapping position by using a crown block, and preparing tapping operation;
s6, before tapping, adding hot high-manganese iron into the residual steel ladle according to the hot slag and the steel remaining amount, and determining the adding amount of the hot high-manganese iron according to the residual steel amount and the end point C content to perform a deoxidization process;
s7, tapping;
s8, refining after tapping; the hot casting residual steel slag can be subjected to desulfurization and ladle heating in the initial stage of refining, the consumption of the refining slag is reduced, the refining smelting temperature is increased, and the direct power supply treatment after refining can reduce the power consumption when the crown block dumps the residual slag;
s9, pouring after refining treatment to continuous casting.
As a preferred technical scheme, the method comprises the following steps,
and S2, a vertical hydraulic cylinder is arranged on one side of the special hot repair base, a piston rod of the hydraulic cylinder is fixed with the special hot repair base, the bottom of the hydraulic cylinder is fixed with the bottom of the ladle, and the included angle between the ladle nozzle and the horizontal plane can be changed through the expansion and contraction of the piston rod.
Further, the included angle range between the ladle nozzle and the horizontal plane in the step S3 is adjusted as follows: when the pouring allowance in the ladle is 3 tons, the included angle between the ladle nozzle and the horizontal plane is 10 degrees; when the pouring allowance in the ladle is 4 tons, the included angle between the ladle nozzle and the horizontal plane is 12 degrees; when the pouring allowance in the ladle is 5 tons, the included angle between the ladle nozzle and the horizontal plane is 15 degrees.
Further, the outer diameter of the ladle drainage rod in the step S4 is 2-5mm smaller than the inner diameter of the ladle nozzle; the length of the ladle drainage rod extending out of the ladle nozzle is 150-200mm.
Further, the ladle drainage rod comprises a cylinder body and drainage sand, and two ends of the drainage sand are sealed in the cylinder body through fusible textured paper; the other end of the ladle drainage rod is positioned through a sliding plate so as to prevent the ladle nozzle from sliding out.
Further, the temperature of the thermal state high manganese iron in the S6 is 1200-1300 ℃ and the liquid state; the carbon content is 4.5-5.0 wt%, the manganese content is 8.5-9.5 wt%, the P+S content is less than 0.15wt%, and the iron content is more than 82wt%.
Further, the addition relation between the addition amount of the hot high manganese iron and the addition amount of the hot residual steel slag and the converter carbon (C) is shown in the following table:
further, in S7, compared with the conventional ladle needing deslagging, the ladle does not need to be added with deoxidizer and slag-pushing material in the tapping process; when the steel ladle discharges molten steel, the sliding plate is moved away, the high-temperature molten steel firstly melts the textured paper in the steel ladle, then enters the steel ladle drainage rod, and is entrained with drainage sand to melt the textured paper at the other end and tapping to the tundish.
Further, the density ratio of the drainage sand to the molten steel is 3:7, and the drainage sand enters the tundish along with the molten steel and is discharged through a slag overflow port at the upper end of the tundish.
Further, the drainage sand mainly comprises SiO 2 :30～32wt％、Cr 2 O 3 :35～37wt％、MgO:3～4.5wt％、Fe 2 O 3 :10～11.5wt％、Al 2 O 3 :13～15wt％、Mn：1～1.5wt％。
The invention has the advantages and positive effects that:
according to the process method for recycling the residual steel slag of continuous casting ladle tapping in the converter, after pouring, 3-5 tons of internal pouring residual thermal state steel slag is left in the ladle, recycling is realized during tapping of the converter, the purity of molten steel is improved, and slag discharging of the ladle is avoided; the molten pouring hot state steel slag is left in the ladle without pouring into a slag basin, the overhead travelling crane directly hangs the ladle into a special base station for hot repair, a ladle drainage rod is arranged at a ladle nozzle, and the molten steel is guided into a tundish by using drainage sand in the drainage rod; before tapping, adding hot high-manganese iron into the residual ladle to carry out a deoxidization process; directly carrying out power supply treatment after refining, carrying out primary desulfurization and ladle heating by using hot casting residual steel slag, reducing consumption of refined slag, improving refining smelting temperature and reducing the electric quantity of overhead travelling crane folded casting residual dumping residual slag; in a word, the invention can recycle the residual heat state slag of continuous casting ladle casting, fully utilize the residual steel and the residue, greatly improve the production efficiency, reduce the consumption of auxiliary materials and reduce the steelmaking production cost.
Description of the drawings:
fig. 1 is a schematic view of the present invention before tapping of a ladle.
Wherein: 1. ladle; 11. ladle nozzle; 2. a special base for hot repair; 3. a hydraulic cylinder; 4. a slide plate; 5. a ladle drainage rod; 51. diversion sand; 52. a piece of paper with beautiful patterns.
Detailed Description
The drawings in the embodiments of the present invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only a few embodiments of the present invention; but not all embodiments. Based on the embodiments in the present invention; all other embodiments obtained by those skilled in the art without undue burden; all falling within the scope of the present invention.
Example 1
The invention provides a process method for recycling residual steel slag of continuous casting ladle in converter tapping, which mainly comprises the following steps:
s1, when the casting of the molten steel of the continuous casting ladle is finished, the total amount of the residual molten steel and steel slag left in the ladle 1 is 3-5 tons, wherein the residual slag is 60-75wt% and the residual steel is 25-40wt%; the reason is that in the later casting period, the residual steel and the residual slag are in a coexisting state, the residual slag is involved in the steel billet to cause the increase of inclusions, the quality of the steel billet is affected, the possibility that the residual steel is involved in the steel billet can be greatly reduced by reserving the residual steel in the range, and the purity of the steel billet is improved;
s2, omitting the conventional steel slag pouring operation, directly lifting the steel ladle containing the molten hot residual steel slag to a station of a special hot repair base 2, and replacing relevant refractory materials of a steel tapping hole of the steel ladle 1;
s3, adjusting the range of an included angle between the ladle nozzle 11 and the horizontal plane by utilizing the special hot repair base 2 according to the weight of ladle casting residues, so as to prevent the casting residues from overflowing from the ladle nozzle;
specifically, a vertical hydraulic cylinder 3 is arranged on one side of the base 2 special for hot repair, a piston rod of the hydraulic cylinder is fixed with the base special for hot repair, and the bottom of the hydraulic cylinder is fixed with the bottom of the ladle, so that the included angle alpha between the ladle nozzle 11 and the horizontal plane can be changed through the expansion and contraction of the piston rod; the adjustment parameters are as follows: when the pouring allowance in the ladle 1 is 3 tons, the included angle between the ladle nozzle 11 and the horizontal plane is 10 degrees; when the pouring allowance in the ladle is 4 tons, the included angle between the ladle nozzle 11 and the horizontal plane is 12 degrees; when the pouring allowance in the ladle is 5 tons, the included angle between the ladle nozzle 11 and the horizontal plane is 15 degrees;
s4, cleaning and replacing the slide plate mechanism; cleaning or replacing the sliding plate 4 and the ladle nozzle 11; cleaning a ladle opening; hot repair; after the steps are finished, installing a ladle drainage rod 5 at the ladle nozzle 11; further, the specification and the dimension of the ladle drainage rod 5 are 750mm long, 55mm in outer diameter and 0.6mm in wall thickness, the outer diameter of the ladle drainage rod 5 is 2-5mm smaller than the inner diameter of the ladle nozzle 11 so as to be convenient for installation and replacement, and the length of the ladle drainage rod 5 extending out of the ladle nozzle 11 is 150-200mm;
preferably, the ladle drainage rod 5 comprises a cylinder body and drainage sand 51, and two ends of the drainage sand are sealed in the cylinder body through fusible textured paper 52. Because the ladle is obliquely arranged, one end of the ladle drainage rod, which is positioned outside the ladle, is positioned by the slide plate 4 to prevent the steel Bao Shuikou from being slipped;
s5, hoisting the ladle filled with the molten thermal state residual steel slag to a converter tapping position by using a crown block, and preparing tapping operation;
s6, before tapping, adding hot high-manganese iron into the residual steel ladle according to the hot slag and the steel remaining amount, and determining the adding amount of the hot high-manganese iron according to the residual steel amount and the end point C content to perform a deoxidization process;
preferably, the temperature of the thermal state high manganese iron is 1200-1300 ℃ and the thermal state high manganese iron is in a liquid state; the carbon content is 4.5 to 5.0 weight percent, the manganese content is 8.5 to 9.5 weight percent, the P+S content is less than 0.15 weight percent, and the iron content is more than 82 weight percent; the purpose of adding the thermal state high manganese iron is to pre-deoxidize molten steel, reduce the temperature drop in the tapping process and improve the cleanliness of the molten steel; the addition relation between the addition amount of the thermal state high manganese iron and the addition amount of the thermal state residual steel slag and the converter carbon (C) is shown in the following table:
s7, tapping; compared with the conventional ladle needing deslagging, the ladle does not need to be added with deoxidizer and slag-pushing material in the tapping process; when the steel ladle discharges molten steel, the sliding plate is moved away, high-temperature molten steel firstly melts the textured paper in the steel ladle, then enters the steel ladle drainage rod, and is entrained with drainage sand to melt the textured paper at the other end and tapping to the tundish; because the ratio of the density of the drainage sand to the density of the molten steel is 3:7, the drainage sand is discharged through a slag overflow port at the upper end of the tundish after entering the tundish along with the molten steel, and the influence is avoidedThe components of the molten steel; the granularity of the drainage sand is 35-85 meshes of that of the chrome sand, and the proper granularity ensures the excellent fluidity of the drainage sand; the main component of the drainage sand is SiO 2 :30～32wt％、Cr 2 O 3 :35～37wt％、MgO:3～4.5wt％、Fe 2 O 3 :10～11.5wt％、Al 2 O 3 13 to 15 weight percent of Mn:1 to 1.5 weight percent, the design of the components can effectively avoid low-temperature hardening, and the drainage effect is good.
S8, refining after tapping; the hot casting residual steel slag can be subjected to desulfurization and ladle heating in the initial stage of refining, the consumption of the refining slag is reduced, the refining smelting temperature is increased, and the direct power supply treatment after refining can reduce the power consumption when the crown block dumps the residual slag;
s9, pouring after refining treatment to continuous casting.
The following is a detailed description of several embodiments:
example 1:
s1, continuously casting ladle surplus according to ladle weighing display, wherein the total amount of the surplus molten steel and steel slag is 3 tons, and the total amount of the surplus molten steel and the steel slag is 70wt% and 30wt% of the surplus steel;
s2, directly lifting the ladle containing the molten hot residual steel slag to a base station special for hot repair without pouring the steel slag, and replacing relevant refractory materials of a ladle tapping hole;
s3, setting an included angle between a ladle nozzle and a horizontal plane to be 10 degrees, and preventing casting residues from overflowing from the ladle nozzle;
s4, replacing the slide plate mechanism, cleaning or replacing the slide plate and the water gap, cleaning the ladle opening, and installing a ladle drainage rod after finishing hot repair;
s5, after finishing hot repair and installation, lifting the ladle filled with the molten thermal state residual steel slag to a converter tapping position by using a crown block, and preparing tapping operation;
s6, before tapping, adding hot high-manganese iron into the residual steel ladle according to the hot slag and the steel remaining amount, and determining the adding amount of the hot high-manganese iron according to the residual steel amount and the end point C content to perform a deoxidization process; the temperature of the thermal state high manganese iron is 1220 ℃, the carbon content is 4.65%, the manganese content is 8.55%, the P+S content is less than 0.15%, and the iron content is 82.5%; the endpoint carbon content of the converter in the embodiment is 0.04%, and the added thermal state high manganese iron is 1 ton;
s7, tapping; in the steel ladle tapping process, no deoxidizing agent and slag jacking material are added;
s8, directly performing power supply treatment after refining, performing initial desulfurization and ladle heating by using hot residual steel slag, reducing the consumption of refined slag, improving the refining smelting temperature and reducing the electric quantity;
s9, pouring after refining treatment to continuous casting.
Example 2:
s1, continuously casting ladle surplus according to ladle weighing display, wherein the total amount of the surplus molten steel and steel slag is 4 tons, and the total amount of the surplus molten steel and the steel slag is 75wt% and the total amount of the surplus steel is 25wt%;
s2, directly lifting the ladle containing the molten hot residual steel slag to a base station special for hot repair without pouring the steel slag, and replacing relevant refractory materials of a ladle tapping hole;
s3, setting an included angle between a ladle nozzle and a horizontal plane to be 12 degrees, and preventing casting residues from overflowing from the ladle nozzle;
s4, replacing the slide plate mechanism, cleaning or replacing the slide plate and the water gap, cleaning the ladle opening, and installing a ladle drainage rod after finishing hot repair;
s5, after finishing hot repair and installation, lifting the ladle filled with the molten thermal state residual steel slag to a converter tapping position by using a crown block, and preparing tapping operation;
s6, before tapping, adding hot high-manganese iron into the residual steel ladle according to the hot slag and the steel remaining amount, and determining the adding amount of the hot high-manganese iron according to the residual steel amount and the end point C content to perform a deoxidization process; the temperature of the thermal state high manganese iron is 1270 ℃, the carbon content is 4.75% in liquid state, the manganese content is 8.80%, the P+S content is less than 0.15%, and the iron content is 84%; the end point carbon content of the converter is 0.06%, and the added thermal state high manganese iron is 1.0 ton;
s7, tapping; in the steel ladle tapping process, no deoxidizing agent and slag jacking material are added;
s8, directly performing power supply treatment after refining, performing initial desulfurization and ladle heating by using hot residual steel slag, reducing the consumption of refined slag, improving the refining smelting temperature and reducing the electric quantity;
s9, pouring after refining treatment to continuous casting.
Example 3:
s1, continuously casting ladle surplus according to ladle weighing display, wherein the total amount of the surplus molten steel and steel slag is 5 tons, and the total amount of the surplus molten steel and the steel slag is 60wt% and 40wt% of the surplus steel;
s2, directly lifting the ladle containing the molten hot residual steel slag to a base station special for hot repair without pouring the steel slag, and replacing relevant refractory materials of a ladle tapping hole;
s3, setting an included angle between a ladle nozzle and a horizontal plane to be 15 degrees, and preventing casting residues from overflowing from the ladle nozzle;
s4, replacing the slide plate mechanism, cleaning or replacing the slide plate and the water gap, cleaning the ladle opening, and installing a ladle drainage rod after finishing hot repair;
s5, after finishing hot repair and installation, lifting the ladle filled with the molten thermal state residual steel slag to a converter tapping position by using a crown block, and preparing tapping operation;
s6, before tapping, adding hot high-manganese iron into the residual steel ladle according to the hot slag and the steel remaining amount, and determining the adding amount of the hot high-manganese iron according to the residual steel amount and the end point C content to perform a deoxidization process; the temperature of the thermal state high manganese iron is 1290 ℃, the carbon content is 4.95%, the manganese content is 9.45%, the P+S content is less than 0.15%, and the iron content is 84.5%; the end point carbon content of the converter is 0.05%, and the added thermal state high manganese iron is 1.4 tons;
s7, tapping; in the steel ladle tapping process, no deoxidizing agent and slag jacking material are added;
s8, directly performing power supply treatment after refining, performing initial desulfurization and ladle heating by using hot residual steel slag, reducing the consumption of refined slag, improving the refining smelting temperature and reducing the electric quantity;
s9, pouring after refining treatment to continuous casting.
The foregoing describes the embodiments of the present invention in detail, but the description is only a preferred embodiment of the present invention and is not to be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (7)
1. A process method for recycling residual steel slag of continuous casting ladle in converter tapping is characterized by mainly comprising the following steps:
s1, when the casting of the molten steel of the continuous casting ladle is finished, the total amount of the residual molten steel and steel slag left in the ladle is 3-5 tons, wherein the residual slag is 60-75wt% and the residual steel is 25-40wt%;
s2, omitting the conventional steel slag pouring operation, directly lifting the steel ladle containing the molten hot residual steel slag to a base station special for hot repair, and replacing relevant refractory materials of a steel ladle tapping hole;
s3, adjusting the included angle range between the ladle nozzle and the horizontal plane by utilizing the special hot repair base according to the weight of the ladle casting residues, so as to prevent the casting residues from overflowing from the ladle nozzle; the included angle range between the ladle nozzle and the horizontal plane is adjusted as follows: when the pouring allowance in the ladle is 3 tons, the included angle between the ladle nozzle and the horizontal plane is 10 degrees; when the pouring allowance in the ladle is 4 tons, the included angle between the ladle nozzle and the horizontal plane is 12 degrees; when the pouring allowance in the ladle is 5 tons, the included angle between the ladle nozzle and the horizontal plane is 15 degrees;
s4, cleaning and replacing the slide plate mechanism; cleaning or replacing the sliding plate and the ladle nozzle; cleaning a ladle opening; hot repair; after the steps are finished, installing a ladle drainage rod at a ladle nozzle;
s5, hoisting the ladle filled with the molten thermal state residual steel slag to a converter tapping position by using a crown block, and preparing tapping operation;
s6, before tapping, adding hot high-manganese iron into the residual steel ladle according to the hot slag and the steel remaining amount, and determining the adding amount of the hot high-manganese iron according to the residual steel amount and the end point C content to perform a deoxidization process; the temperature of the thermal state high manganese iron is 1200-1300 ℃ and the liquid state; the carbon content is 4.5 to 5.0 weight percent, the manganese content is 8.5 to 9.5 weight percent, the P+S content is less than 0.15 weight percent, and the iron content is more than 82 weight percent; the addition relation of the thermal state high ferromanganese addition amount and the thermal state residual steel slag and the converter carbon content is shown in the following table:
s7, tapping;
s8, refining after tapping; the hot casting residual steel slag can be subjected to desulfurization and ladle heating in the initial stage of refining, the consumption of refining slag materials is reduced, the refining smelting temperature is increased, and the electric quantity of the refining slag can be reduced by directly carrying out electric treatment after refining;
s9, pouring after refining treatment to continuous casting.
2. The process method for recycling the continuous casting ladle residual steel slag for converter tapping according to claim 1, wherein a vertical hydraulic cylinder is arranged on one side of the base special for hot repair in the step S2, a piston rod of the hydraulic cylinder is fixed with the base special for hot repair, the bottom of the hydraulic cylinder is fixed with the bottom of the ladle, and the included angle between a ladle nozzle and the horizontal plane can be changed through the expansion and contraction of the piston rod.
3. The process for recycling the continuous casting ladle residual steel slag for converter tapping according to claim 1, wherein the outer diameter of the ladle drainage rod in S4 is 2-5mm smaller than the inner diameter of a ladle nozzle; the length of the ladle drainage rod extending out of the ladle nozzle is 150-200mm.
4. The process for recycling the continuous casting ladle residual steel slag for converter tapping according to claim 1, wherein the ladle drainage rod comprises a cylinder body and drainage sand, and two ends of the drainage sand are sealed in the cylinder body through fusible textured paper; one end of the ladle drainage rod, which is positioned outside the ladle, is positioned by a sliding plate so as to prevent the ladle drainage rod from sliding out of the ladle nozzle.
5. The process for recycling the continuous casting ladle residual steel slag for converter tapping according to claim 1, wherein in the step S7, when the ladle is tapped, the sliding plate is moved away, the high-temperature molten steel firstly melts the textured paper in the ladle, then enters the ladle drainage rod, and the textured paper at the other end is melted by the drainage sand and tapped to the tundish.
6. The process for recycling the continuous casting ladle residual steel slag for converter tapping according to claim 1, which is characterized in that: the ratio of the density of the drainage sand to the density of the molten steel is 3:7, and the drainage sand enters the tundish along with the molten steel and is discharged through a slag overflow port at the upper end of the tundish.
7. The process for recycling the continuous casting ladle residual steel slag for converter tapping according to claim 4, wherein the process comprises the following steps: the main component of the drainage sand is SiO 2 :30～32wt%、Cr 2 O 3 :35～37wt%、MgO:3～4.5wt%、Fe 2 O 3 :10～11.5wt%、Al 2 O 3 :13～15wt%、Mn：1～1.5wt%。
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| JP5605339B2 (en) * | 2011-09-20 | 2014-10-15 | 新日鐵住金株式会社 | Recycling method of steelmaking slag |
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