CN110804685A - Slag washing and refining process for tapping of converter - Google Patents
Slag washing and refining process for tapping of converter Download PDFInfo
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- CN110804685A CN110804685A CN201911234440.2A CN201911234440A CN110804685A CN 110804685 A CN110804685 A CN 110804685A CN 201911234440 A CN201911234440 A CN 201911234440A CN 110804685 A CN110804685 A CN 110804685A
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- deoxidation
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- 239000002893 slag Substances 0.000 title claims abstract description 123
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 70
- 238000005406 washing Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000007670 refining Methods 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 101
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 99
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 60
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 55
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000002245 particle Substances 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 31
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 30
- 230000023556 desulfurization Effects 0.000 claims abstract description 30
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 23
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 23
- 239000004571 lime Substances 0.000 claims abstract description 23
- 229910052786 argon Inorganic materials 0.000 claims abstract description 22
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims abstract description 6
- 238000007664 blowing Methods 0.000 claims description 26
- 239000002994 raw material Substances 0.000 claims description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 15
- 229910052681 coesite Inorganic materials 0.000 claims description 10
- 229910052906 cristobalite Inorganic materials 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- 229910052682 stishovite Inorganic materials 0.000 claims description 10
- 229910052905 tridymite Inorganic materials 0.000 claims description 10
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 229910052593 corundum Inorganic materials 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 5
- 239000010436 fluorite Substances 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 abstract description 10
- 230000003749 cleanliness Effects 0.000 abstract description 3
- 239000012535 impurity Substances 0.000 abstract description 3
- 238000009628 steelmaking Methods 0.000 abstract description 3
- 238000005266 casting Methods 0.000 abstract 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 3
- 229910000655 Killed steel Inorganic materials 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 241001536352 Fraxinus americana Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—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
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21C7/0645—Agents used for dephosphorising or desulfurising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a slag washing and refining process for converter tapping, which belongs to the technical field of steel making, and the strong desulfurization and deoxidation of the process are as follows: when molten steel is fully paved at the bottom of a ladle in converter tapping, slag washing materials and lime slag are continuously and uniformly poured into the ladle through an alloy chute; adding aluminum particles for strong deoxidation when tapping is carried out by the converter for 1min, wherein the adding amount of the aluminum particles is 1.5-2.5 kg/t steel; the flow of argon blown from the bottom of the steel ladle in the tapping process is more than or equal to 500 NL/min; after tapping, adding aluminum particles to the slag surface of the steel ladle for slag deoxidation, wherein the addition amount is 0.3-0.5 kg/t; the oxidability (FeO + MnO) of the steel slag is less than or equal to 2 percent, and the performance index w (CaO)/w (Al) of the slag2O3) = 1.5-2.0; the invention realizes the desulfurization and deoxidation through the tapping slag washing process under the condition without a refining furnace, effectively removes impurities in steel, improves the castability of continuous casting and improves the cleanliness of casting blanks.
Description
Technical Field
The invention relates to a slag washing and refining process for converter tapping, belonging to the technical field of steel making.
Background
At present, most steel plants produce variety steel or aluminum killed steel, in order to ensure the product quality or ensure continuous casting and multi-furnace continuous casting, discharged molten steel is subjected to a series of external refining treatment such as LF furnace, RH, VD and the like, and molten steel refining is used for deoxidation, desulfurization, inclusion removal and the like so as to ensure the quality of the variety steel. For example, some kinds of steel or aluminum killed steel do not undergo refining treatment, and more Al is generated in the deoxidation process2O3The like inclusions which do not effectively remove the Al during the continuous casting of steel2O3The similar impurities can be attached to the inner walls of the continuous casting upper nozzle and the submerged nozzle, so that the continuous casting wadding nozzle is caused, the continuous casting forward pouring performance is influenced, the normal production is influenced, and the product quality of steel cannot be guaranteed. The molten steel refining equipment has large investment and high production cost, so the slag washing and refining process of steel-making tapping is developed.
Chinese patent 201010146899.X discloses a converter tapping slag washing pre-desulfurization refining process, which adopts the steps that synthetic slag is added to the bottom of a steel ladle before tapping, and white ash is continuously and uniformly added along with steel flow when tapping for 2 min.
Disclosure of Invention
The invention aims to solve the technical problem of providing a converter tapping slag washing refining process, which determines the converter tapping slag washing refining process by systematically analyzing factors such as a deoxidation mode, slag washing material components, slag washing quantity, slag washing proportion, slag washing material adding time and the like in the converter tapping process, so that the slag washing process is simpler to operate, has wide applicability, does not need special equipment, does not occupy process time, can reduce production cost compared with other refining processes (LF, RH and VD), saves process time, can completely replace other refining devices by using synthetic slag washing when certain steel types are produced, realizes the purposes of desulfurizing, deoxidizing, changing inclusion and removing inclusion in steel, improves the cleanliness of steel, improves continuous casting castability and improves the quality of steel.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a converter tapping slag washing refining process comprises the steps of raw material preparation, converter tapping, strong desulfurization and deoxidation, and slag deoxidation;
(1) raw material preparation
The method adopts aluminum-containing premelting slag washing material, aluminum particles and lime small slag as the raw materials for desulfurization and deoxidation, wherein: the aluminum-containing premelting slag washing material comprises the following raw materials in percentage by weight: 39-45% of CaO and Al2O328~35%，SiO20%~5%，MgO 0%~5%，Al 7%~10%，CaF24% -10%; aluminum particles, wherein Al is more than or equal to 99.9 percent; the lime slag comprises the following raw materials in percentage by weight: 85-93% of CaO and SiO20%~3%；
(2) Strong desulfurization and deoxidation
When tapping for 30S in a converter, molten steel is fully paved on the bottom of a ladle, at the moment, 1-3 kg/t of steel containing aluminum pre-molten slag washing material and 3-5 kg/t of steel containing lime small slag are continuously and uniformly poured into the ladle through an alloy chute, and 0.25kg/t of fluorite is added;
(ii) adding aluminum particles for strong deoxidation when tapping is carried out for 1min by a converter, wherein the adding amount of the aluminum particles is 1.5-2.5 kg/t steel;
(iii) when converter tapping is carried out for 3-4 min, the ladle bottom blowing flow is more than or equal to 500NL/min, slag washing materials, lime small slag and molten steel are uniformly mixed through strong stirring kinetic energy of ladle bottom blowing argon, and liquid slag washing material liquid drops can be immediately combined with a deoxidation product, adsorbed and quickly floated and removed;
(iv) tapping and slag stopping are carried out when the converter tapping reaches 3/4 until the converter tapping is finished;
(3) deoxidation of slag
After tapping of the converter is finished, adding aluminum particles to the slag surface of the steel ladle for slag deoxidation, wherein the addition amount is 0.3-0.5 kg/t; after aluminum particles are added, immediately conveying the steel ladle to an argon blowing station, and making the molten steel enter a soft argon blowing stage, wherein the process duration is more than or equal to 12min, and the exposed diameter of the liquid surface of the soft argon blowing stage is 100-200 mm;
(4) top ash composition control
The oxidability (FeO + MnO) of the steel slag is less than or equal to 2 percent, and the performance index w (CaO)/w (Al) of the slag2O3) = 1.5-2.0; the alkalinity of the top slag is more than 6.
The further preferred scheme is as follows: the granularity of the washing material of the aluminum-containing premelting slag is 10-30 mm; the granularity of the lime small slag is 10-40 mm, and the activity is more than or equal to 320.
Compared with the prior art, the invention adopting the technical scheme has the beneficial effects that:
(1) removing inclusion and purifying molten steel: the slag washing material added in the tapping process is rapidly mixed with molten steel and fully exchanges heat to melt under the strong stirring kinetic energy of the argon blowing at the bottom of the ladle, and the molten synthetic slag contains a large amount of Al2O3Of calcium aluminate. Deoxidation product of solid phase Al2O3Has better adsorption capacity, thereby being agglomerated together to grow up and quickly floating up, thereby reducing the number of impurities in the finished steel.
(2) Deoxidizing the molten steel: after the molten steel slag is washed, the total oxygen content in the steel is reduced to about 30ppm from the previous 40-50ppm, and the total content of FeO and MnO in the molten steel slag is also reduced to 1-2% from the previous 6%.
(3) Molten steel desulfurization: the slag washing process improves the alkalinity of ladle slag, reduces the content of ferric oxide, effectively improves the desulfurization in the tapping process, and the desulfurization rate of the slag washing process can reach 25-35%.
(4) The continuous casting castability is improved: slag washing process for making Al in steel2O3The inclusion is effectively reduced, the cleanliness of molten steel is improved, the condition of the inclusion flocculation nozzle is greatly reduced, and the number of continuous casting furnaces is increased from 15 furnaces/middle ladle to 27 furnaces/middle ladle.
(5) The production cost is low: through the tapping slag washing refining process, the refining equipment is reduced, and the production cost is reduced.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1:
steel SPHC of steel grade, 120t converter tapping, tapping temperature 1650 ℃.
(1) Raw material preparation
The main raw materials are aluminum-containing premelting slag washing material, aluminum particles and lime slag for desulfurization and deoxidation. Wherein, the aluminum-containing premelting slag washing material is prepared by the following raw materials in parts by weightThe weight percentage composition is as follows: CaO: 39% -45% of Al2O3：28~35%，SiO2：0%~5%，MgO：0%~5%，Al：7%~10%，CaF2: 4-10% of aluminum particles with the particle size of 10-30 mm, wherein the aluminum particles are composed of the following raw materials in percentage by weight: al is more than or equal to 99.9 percent; the lime slag comprises the following raw materials in percentage by weight: CaO: 85% -93% of SiO2: 0-3%, activity degree not less than 320 and granularity of 10-40 mm.
(2) Strong desulfurization and deoxidation
The tapping of the converter and the strong desulfurization and deoxidation are almost simultaneously carried out, so the strong desulfurization and deoxidation are controlled according to the tapping time of the converter:
when 30S steel is tapped from the converter, molten steel is fully paved on the bottom of the ladle, 2.5kg/t of steel containing aluminum pre-molten slag washing material and 3.5kg/t of steel containing lime small slag are continuously and uniformly poured into the ladle through an alloy chute, and 0.25kg/t of fluorite is added.
And (ii) adding aluminum particles for strong deoxidation when tapping is carried out by the converter for 1min, wherein the adding amount of the aluminum particles is 2.2kg/t steel.
(iii) strong desulfurization and deoxidation are carried out when converter tapping is carried out for 3.7min, the ladle bottom blowing flow rate is required to reach 780NL/min, slag washing materials, lime small slag and molten steel are fully stirred and uniformly mixed by strong stirring kinetic energy of ladle bottom blowing argon, liquid slag washing material liquid drops can be immediately combined with deoxidation products, adsorbed and quickly floated up for removal, and the effects of purifying the molten steel, improving the quality of the molten steel and improving the fluidity of the molten steel are realized.
(iv) tapping and slag stopping are carried out when the molten steel of the converter is discharged to 3/4 until the tapping of the converter is finished, the slag falling in the tapping process is avoided, and the quality of the molten steel is ensured.
(3) Deoxidation of slag
And after the tapping of the converter is finished, adding aluminum particles to the slag surface of the steel ladle for slag deoxidation, wherein the addition amount is 0.4 kg/t. And after the aluminum particles are added, immediately conveying the steel ladle to an argon blowing station, and enabling the molten steel to enter a soft argon blowing stage, wherein the process duration is 17min, and the exposed diameter of the liquid surface of the soft argon blowing stage is 100-200 mm.
The composition condition of the ladle top slag: CaO: 53.68%, w (CaO)/w (Al)2O3) And (FeO + MnO) =1.5%, and the top slag alkalinity is 10.2. The S content in the steel is removed from 150ppm in front of the furnace to 100ppm, and the steel is desulfurized by slag washingThe rate reaches 33.33 percent. The total oxygen content in the steel was 26ppm, and the inclusion rating was 0.5 by rolling into strip steel.
Example 2:
steel grade Q235BL was tapped from a 120t converter at a tapping temperature of 1643 ℃.
(1) Raw material preparation
The main raw materials are aluminum-containing premelting slag washing material, aluminum particles and lime slag for desulfurization and deoxidation. The aluminum-containing premelting slag washing material comprises the following raw materials in percentage by weight: CaO: 39% -45% of Al2O3：28~35%，SiO2：0%~5%，MgO：0%~5%，Al：7%~10%，CaF2: 4-10% of aluminum particles with the particle size of 10-30 mm, wherein the aluminum particles are composed of the following raw materials in percentage by weight: al is more than or equal to 99.9 percent; the lime slag comprises the following raw materials in percentage by weight: CaO: 85% -93% of SiO2: 0-3%, activity degree not less than 320 and granularity of 10-40 mm.
(2) Strong desulfurization and deoxidation
The tapping of the converter and the strong desulfurization and deoxidation are almost simultaneously carried out, so the strong desulfurization and deoxidation are controlled according to the tapping time of the converter:
when tapping for 30S in the converter, the molten steel is fully paved on the bottom of the ladle, 2kg/t of steel containing aluminum pre-molten slag washing material and 3kg/t of steel containing lime small slag are continuously and uniformly poured into the ladle through an alloy chute, and 0.25kg/t of fluorite is added at the same time.
And (ii) adding aluminum particles for strong deoxidation when tapping is carried out by the converter for 1min, wherein the adding amount of the aluminum particles is 1.7kg/t steel.
(iii) strong desulfurization and deoxidation are carried out when converter tapping is carried out for 3.5min, the ladle bottom blowing flow rate should reach 658NL/min, slag washing materials, lime small slag and molten steel are fully stirred and uniformly mixed through strong stirring kinetic energy of ladle bottom blowing argon, liquid slag washing material liquid drops can be immediately combined with deoxidation products, adsorbed and quickly floated and removed, and the effects of purifying the molten steel, improving the quality of the molten steel and improving the fluidity of the molten steel are realized.
(iv) tapping and slag stopping are carried out when the molten steel of the converter is discharged to 3/4 until the tapping of the converter is finished, the slag falling in the tapping process is avoided, and the quality of the molten steel is ensured.
(3) Deoxidation of slag
And after the tapping of the converter is finished, adding aluminum particles to the slag surface of the steel ladle for slag deoxidation, wherein the addition amount is 0.3 kg/t. And after the aluminum particles are added, immediately conveying the steel ladle to an argon blowing station, and enabling the molten steel to enter a soft argon blowing stage, wherein the process duration is 14min, and the exposed diameter of the liquid surface of the soft argon blowing stage is 100-200 mm.
The composition condition of the ladle top slag: CaO: 51.57%, w (CaO)/w (Al)2O3) =1.56, (FeO + MnO) =1.8%, and top slag basicity is 9.5. The S content in the steel is removed from 230ppm in front of the furnace to 170ppm, and the desulfurization rate of tapping slag washing reaches 26.09%. The total oxygen content in the steel was 32ppm, and the inclusion rating was 1.5 by rolling into strip steel.
Example 3:
steel grade Q195L was tapped from a 120t converter at a tapping temperature of 1648 ℃.
(1) Raw material preparation
The main raw materials are aluminum-containing premelting slag washing material, aluminum particles and lime slag for desulfurization and deoxidation. The aluminum-containing premelting slag washing material comprises the following raw materials in percentage by weight: CaO: 39% -45% of Al2O3：28~35%，SiO2：0%~5%，MgO：0%~5%，Al：7%~10%，CaF2: 4-10% of aluminum particles with the particle size of 10-30 mm, wherein the aluminum particles are composed of the following raw materials in percentage by weight: al is more than or equal to 99.9 percent; the lime slag comprises the following raw materials in percentage by weight: CaO: 85% -93% of SiO2: 0-3%, activity degree not less than 320 and granularity of 10-40 mm.
(2) Strong desulfurization and deoxidation
The tapping of the converter and the strong desulfurization and deoxidation are almost simultaneously carried out, so the strong desulfurization and deoxidation are controlled according to the tapping time of the converter:
when 30S of converter tapping is carried out, molten steel is fully paved on the bottom of a ladle, 1.5kg/t of aluminum-containing premelting slag washing material and 4kg/t of steel of lime small slag are continuously and uniformly poured into the ladle through an alloy chute, and 0.25kg/t of fluorite is added.
And (ii) adding aluminum particles for strong deoxidation when tapping is carried out by the converter for 1min, wherein the adding amount of the aluminum particles is 1.9kg/t steel.
And (iii) carrying out strong desulfurization and deoxidation when tapping is carried out in the converter for 3min, wherein the ladle bottom blowing flow rate is required to reach 726NL/min, the slag washing material, the lime slag and the molten steel are fully and uniformly stirred by strong stirring kinetic energy of the ladle bottom blowing argon, liquid slag washing material liquid drops can be immediately combined with a deoxidation product, adsorbed and quickly floated and removed, and the effects of purifying the molten steel, improving the quality of the molten steel and improving the fluidity of the molten steel are realized.
(iv) tapping and slag stopping are carried out when the molten steel of the converter is discharged to 3/4 until the tapping of the converter is finished, the slag falling in the tapping process is avoided, and the quality of the molten steel is ensured.
(3) Deoxidation of slag
And after the tapping of the converter is finished, adding aluminum particles to the slag surface of the steel ladle for slag deoxidation, wherein the addition amount is 0.3 kg/t. And after the aluminum particles are added, immediately conveying the steel ladle to an argon blowing station, and enabling the molten steel to enter a soft argon blowing stage, wherein the process duration is 15min, and the exposed diameter of the liquid surface of the soft argon blowing stage is 100-200 mm.
The composition condition of the ladle top slag: CaO: 52.68%, w (CaO)/w (Al)2O3) =1.68, (FeO + MnO) =1.6%, and top slag basicity is 10.2. The S content in the steel is removed to 150ppm from 210ppm in front of the furnace, and the desulfurization rate of tapping slag washing reaches 28.57 percent. The total oxygen content in the steel was 29ppm, and the inclusion grade was 1.0 grade by rolling into a strip steel.
Although the present invention has been described in detail with reference to the preferred embodiments, it should be understood that various modifications and adaptations of the present invention may occur to those skilled in the art without departing from the spirit and scope of the present invention.
Claims (2)
1. A converter tapping slag washing refining process comprises the steps of raw material preparation, converter tapping, strong desulfurization and deoxidation, and slag deoxidation; the method is characterized in that:
(1) raw material preparation
The method adopts aluminum-containing premelting slag washing material, aluminum particles and lime small slag as the raw materials for desulfurization and deoxidation, wherein: the aluminum-containing premelting slag washing material comprises the following raw materials in percentage by weight: 39-45% of CaO and Al2O328~35%，SiO20%~5%，MgO 0%~5%，Al 7%~10%，CaF24%~10%(ii) a Aluminum particles, wherein Al is more than or equal to 99.9 percent; the lime slag comprises the following raw materials in percentage by weight: 85-93% of CaO and SiO20%~3%；
(2) Strong desulfurization and deoxidation
When tapping for 30S in a converter, molten steel is fully paved on the bottom of a ladle, at the moment, 1-3 kg/t of steel containing aluminum pre-molten slag washing material and 3-5 kg/t of steel containing lime small slag are continuously and uniformly poured into the ladle through an alloy chute, and 0.25kg/t of fluorite is added;
(ii) adding aluminum particles for strong deoxidation when tapping is carried out for 1min by a converter, wherein the adding amount of the aluminum particles is 1.5-2.5 kg/t steel;
(iii) when converter tapping is carried out for 3-4 min, the ladle bottom blowing flow is more than or equal to 500NL/min, slag washing materials, lime small slag and molten steel are uniformly mixed through strong stirring kinetic energy of ladle bottom blowing argon, and liquid slag washing material liquid drops can be immediately combined with a deoxidation product, adsorbed and quickly floated and removed;
(iv) tapping and slag stopping are carried out when the converter tapping reaches 3/4 until the converter tapping is finished;
(3) deoxidation of slag
After tapping of the converter is finished, adding aluminum particles to the slag surface of the steel ladle for slag deoxidation, wherein the addition amount is 0.3-0.5 kg/t; after aluminum particles are added, immediately conveying the steel ladle to an argon blowing station, and making the molten steel enter a soft argon blowing stage, wherein the process duration is more than or equal to 12min, and the exposed diameter of the liquid surface of the soft argon blowing stage is 100-200 mm;
(4) top ash composition control
The oxidability (FeO + MnO) of the steel slag is less than or equal to 2 percent, and the performance index w (CaO)/w (Al) of the slag2O3) = 1.5-2.0; the alkalinity of the top slag is more than 6.
2. The converter tapping slag washing refining process according to claim 1, characterized in that: the granularity of the washing material of the aluminum-containing premelting slag is 10-30 mm; the granularity of the lime small slag is 10-40 mm, and the activity is more than or equal to 320.
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| CN201911234440.2A CN110804685A (en) | 2019-12-05 | 2019-12-05 | Slag washing and refining process for tapping of converter |
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| CN201911234440.2A CN110804685A (en) | 2019-12-05 | 2019-12-05 | Slag washing and refining process for tapping of converter |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112593136A (en) * | 2020-11-04 | 2021-04-02 | 邯郸钢铁集团有限责任公司 | Smelting method for reducing formation of large inclusions in steel rail for high-speed railway |
| CN112961960A (en) * | 2021-02-03 | 2021-06-15 | 重庆钢铁股份有限公司 | Technological method for improving abnormal condition of tapping slag |
| CN114045376A (en) * | 2021-10-18 | 2022-02-15 | 首钢集团有限公司 | Method for desulfurizing molten steel in converter tapping process |
| CN114318113A (en) * | 2021-12-17 | 2022-04-12 | 扬州恒润海洋重工有限公司 | Slag washing direct-upward continuous casting production process of hot rolled steel converter |
| CN114350880A (en) * | 2022-01-07 | 2022-04-15 | 包头钢铁（集团）有限责任公司 | Method for controlling oxidability of top slag in steel ladle after converter tapping |
| CN114854940A (en) * | 2022-04-26 | 2022-08-05 | 江苏省镔鑫钢铁集团有限公司 | Refining slag washing and refining process and device for refining slag |
| CN115710613A (en) * | 2022-11-25 | 2023-02-24 | 陕钢集团汉中钢铁有限责任公司 | Control method for low inclusion of silicon killed steel |
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| CN117004795A (en) * | 2022-12-31 | 2023-11-07 | 德龙钢铁有限公司 | A method to reduce inclusion levels in low-alloy high-strength steel Q355B for cold rolling |
| CN117512272A (en) * | 2023-12-20 | 2024-02-06 | 江苏省镔鑫钢铁集团有限公司 | A production method of H08Mn welding rod steel based on converter direct loading and pre-melted slag washing |
| CN118600149A (en) * | 2024-08-09 | 2024-09-06 | 山西建龙实业有限公司 | A method for producing small-section aluminum-containing square billet by slag washing and direct-lifting technology |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112593136A (en) * | 2020-11-04 | 2021-04-02 | 邯郸钢铁集团有限责任公司 | Smelting method for reducing formation of large inclusions in steel rail for high-speed railway |
| CN112961960A (en) * | 2021-02-03 | 2021-06-15 | 重庆钢铁股份有限公司 | Technological method for improving abnormal condition of tapping slag |
| CN114045376A (en) * | 2021-10-18 | 2022-02-15 | 首钢集团有限公司 | Method for desulfurizing molten steel in converter tapping process |
| CN114318113A (en) * | 2021-12-17 | 2022-04-12 | 扬州恒润海洋重工有限公司 | Slag washing direct-upward continuous casting production process of hot rolled steel converter |
| CN114350880A (en) * | 2022-01-07 | 2022-04-15 | 包头钢铁（集团）有限责任公司 | Method for controlling oxidability of top slag in steel ladle after converter tapping |
| CN114854940B (en) * | 2022-04-26 | 2023-08-11 | 江苏省镔鑫钢铁集团有限公司 | Slag washing and refining process for refining slag |
| CN114854940A (en) * | 2022-04-26 | 2022-08-05 | 江苏省镔鑫钢铁集团有限公司 | Refining slag washing and refining process and device for refining slag |
| CN115710613A (en) * | 2022-11-25 | 2023-02-24 | 陕钢集团汉中钢铁有限责任公司 | Control method for low inclusion of silicon killed steel |
| CN115710613B (en) * | 2022-11-25 | 2024-03-19 | 陕钢集团汉中钢铁有限责任公司 | Control method for low inclusion of silicon killed steel |
| CN117004795A (en) * | 2022-12-31 | 2023-11-07 | 德龙钢铁有限公司 | A method to reduce inclusion levels in low-alloy high-strength steel Q355B for cold rolling |
| CN116121625A (en) * | 2023-02-23 | 2023-05-16 | 首钢集团有限公司 | Low-sulfur low-oxygen high-nitrogen tinned steel plate and preparation method thereof |
| CN117512272A (en) * | 2023-12-20 | 2024-02-06 | 江苏省镔鑫钢铁集团有限公司 | A production method of H08Mn welding rod steel based on converter direct loading and pre-melted slag washing |
| CN117512272B (en) * | 2023-12-20 | 2024-12-24 | 江苏省镔鑫钢铁集团有限公司 | H08Mn welding strip steel production method based on converter direct up and premelting slag washing |
| CN118600149A (en) * | 2024-08-09 | 2024-09-06 | 山西建龙实业有限公司 | A method for producing small-section aluminum-containing square billet by slag washing and direct-lifting technology |
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