CN111230054B - Method for cleaning slag adhered to bottom of steel ladle - Google Patents
Method for cleaning slag adhered to bottom of steel ladle Download PDFInfo
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- CN111230054B CN111230054B CN202010166904.7A CN202010166904A CN111230054B CN 111230054 B CN111230054 B CN 111230054B CN 202010166904 A CN202010166904 A CN 202010166904A CN 111230054 B CN111230054 B CN 111230054B
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- ladle
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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
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a method for cleaning slag adhered to the bottom of a steel ladle. The method comprises the steps of smelting the square-billet deformed steel bar in a converter, controlling the end point temperature to be more than or equal to 1630 ℃, and controlling the end point carbon content to be 0.06% -0.15%; conveying a steel ladle to be treated to a converter tapping position, adding fluorite and silicon carbide to the bottom of the steel ladle, and tapping; adding carbon powder and silicon-manganese alloy in the tapping process of the converter, and controlling the components of molten steel: c is more than or equal to 0.2 percent; 0.2 to 0.6 percent of Si; 1.2 to 1.5 percent of Mn; alt is less than or equal to 0.0030 percent; after tapping, the ladle is conveyed to an argon blowing station for argon blowing, and the top slag composition of the molten steel is controlled as follows: 35 to 40 percent of CaO and SiO2:30%～35%、Al2O3Less than or equal to 10 percent and less than or equal to 10 percent of MgO; and (4) casting after the argon station is out of the station, wherein the temperature in the casting process is more than or equal to 1520 ℃, and pouring out the casting residue after casting. The invention provides a method for cleaning the bottom sticky slag of a steel ladle, aiming at the problem that the deposition of high-melting-point substances is more separated out from the bottom of the steel ladle after slab aluminum killed molten steel is cast, the cleaned steel ladle recovers the service performance, and the method has the advantages of remarkable effect, convenience in operation and no increase in cost.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a method for cleaning slag adhered to the bottom of a steel ladle.
Background
The steel ladle is used as important equipment for containing molten steel in the metallurgical field, and the quality of the service performance of the steel ladle directly influences the stable and smooth production of a steel mill. After the molten steel is poured into the steel ladle, slag remained at the bottom of the steel ladle continuously precipitates high-melting-point substances along with the reduction of temperature, and deposits on the bottom of the steel ladle to form sticky slag. As the ladle bottom sticking slag is deposited more, a plurality of adverse factors are caused to the production of a steel mill. Firstly, the bottom of the ladle is more in slag adhesion, the weight of an empty ladle is greatly increased, the steel yield is seriously influenced, and meanwhile, the risk of overweight of a travelling crane is increased, so that potential safety hazards are brought; in addition, after slag adhesion, the ladle bottom loses the original inclined bottom structure, and a pit is seriously formed at the position of the air brick, so that the pouring allowance of molten steel is influenced.
The bottom slag of the ladle is mainly Al2O3、CaO、MgO、SiO2Mainly comprising the components, the magnesium aluminate spinel (MgAl) can be continuously precipitated along with the reduction of the temperature2O4) Melilite (Ca)2Al2SiO7) Calcium bis-aluminate (CaO.2Al)2O3) And calcium hexaluminate (CaO.6Al)2O3) High melting point materials. Slab aluminum killed steel produced by steel plant, with high Al content in ladle slag2O3(20-40 percent) and high CaO, and has high viscosity. After 5 furnace plate blanks of aluminum killed steel are continuously produced by the same ladle, the phenomenon that the weight of an empty ladle is not reduced but increased obviously occurs, and meanwhile, the bottom of the ladle is seriously stuck with slag, the problems that molten steel cannot be completely poured, the pouring residual quantity is large and the like occur.
Disclosure of Invention
The invention provides a method for cleaning the slag adhered to the bottom of a steel ladle, aiming at the problem that the more deposition of high-melting-point substances is separated out on the bottom of the steel ladle due to the fact that casting residue can not be completely poured after slab aluminum killed molten steel is cast, the cleaned steel ladle recovers the service performance, and the method is remarkable in effect, convenient to operate and free of cost increase.
In order to solve the problems, the invention adopts the technical scheme that:
the method comprises the following steps:
A. smelting the square-billet deformed steel bar in a converter, controlling the end point temperature to be more than or equal to 1630 ℃, and controlling the end point carbon content to be 0.06-0.15%;
B. conveying the steel ladle with serious slag-sticking sediment at the ladle bottom to a converter tapping position, adding fluorite and silicon carbide to the ladle bottom of the steel ladle, and tapping;
C. adding carbon powder and silicon-manganese alloy into a steel ladle in the converter tapping process, and controlling the molten steel components: c is more than or equal to 0.2 percent; 0.2 to 0.6 percent of Si; 1.2 to 1.5 percent of Mn; alt is less than or equal to 0.0030 percent;
D. after tapping, the steelConveying the ladle to an argon blowing station for argon blowing, and controlling the components of molten steel top slag: 35 to 40 percent of CaO and SiO2:30%～35%、Al2O3:≤10%、MgO:≤10%；
E. And (4) after the argon station is out of the station, sending the molten steel to a billet continuous casting machine for casting, controlling the temperature of the molten steel to be more than or equal to 1520 ℃ in the casting process, and pouring out the residual slag cast in the steel ladle after the molten steel in the steel ladle is cast.
In the above technical solution, a more specific technical solution may also be: the dosage of the fluorite is 0 kg/furnace-10 kg/furnace, and the dosage of the silicon carbide is 1.8kg/t molten steel-10 kg/t molten steel.
And further, in the step B, adding fluorite and silicon carbide to the bottom of the steel ladle, and tapping after 1 min.
Further, after tapping for 30s by the converter, carbon powder and silicon-manganese alloy are added into a ladle.
Further, in the step C, the flow of argon gas blown from the bottom of the steel ladle in the tapping process is controlled to be more than 25m3/h；
Further, in the step D, the argon blowing time is 10-20 min, and the temperature of the argon outlet station is 1560-1575 ℃.
Further, in the argon blowing process with the duration of 10 min-20 min, the duration of strong argon blowing (the exposed diameter of the molten steel surface is more than 150 mm) is more than or equal to 5 min.
And in the step E, pouring the ladle casting residues within 8 min after the ladle molten steel is cast.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the invention converts the ladle which contains the slag adhered to the bottom of the ladle caused by the slab aluminum killed steel into a ladle for smelting square-billet deformed steel, adds fluorite and silicon carbide in advance to the bottom of the ladle for slagging and deoxidation, and utilizes the high tapping temperature of the deformed steel, the carbon content of the molten steel is 0.2-0.3 percent, Alt is less than or equal to 0.0030 percent (especially the Alt content), the silicomanganese deoxidation of the molten steel does not contain aluminum, the low alkalinity and the low Al of the top slag of the molten steel are2O3The ladle bottom slag is effectively cleaned after molten steel washing and bottom argon gas blowing stirring, the cleaned ladle bottom recovers the service performance, the empty ladle weight is reduced, and steel is subjected to slag removalThe structure of the bottom of the ladle is recovered, and the pouring residual quantity is reduced.
Detailed Description
The invention is further described in detail below with reference to the following examples:
example 1
And (3) smelting continuous 7-furnace casting slab aluminum killed steel (3-furnace SPHC and 4-furnace DC 01) after three-zone C03 ladle is positioned on the line, and when the 7 th furnace casting is finished, finding that the molten steel cannot be completely discharged and the ladle casting allowance is large. After pouring the residual steel slag, the weight of an empty ladle of No. C03 is increased by 2t compared with the new weight of the empty ladle of No. C03. When the ladle is packed and the nozzle is cleaned, the bottom of the ladle is found to be thick, the ladle is immediately arranged to be transferred to a furnace base for producing deformed steel bar, and the bottom of the ladle is cleaned according to the following steps:
smelting square-billet deformed steel HRB400E-0NbS in an A.8 #150T converter, wherein the end point temperature is 1640 ℃, and the end point carbon content is controlled to be 0.060%;
B. conveying a steel ladle of No. C03 to a converter tapping position, adding 10kg of fluorite and 345kg of silicon carbide to the bottom of the steel ladle, and tapping after 1 min;
C. adding carbon powder and silicon-manganese alloy into a ladle after tapping for 30s by a converter, and adjusting the content of molten steel to be 0.205 percent; 0.404 percent of Si; 1.42 percent of Mn; 0.0015 percent of Alt; controlling the flow of argon bottom blowing in the steel ladle to be 32m in the tapping process3/h；
D. After tapping, the ladle is conveyed to an argon blowing station, and the argon blowing time of the argon blowing station is as follows: 11.45min, wherein strong argon blowing (the exposed diameter of the liquid steel surface is about 260 mm) is carried out for 11.3min, and the temperature of an argon outlet station is 1567 ℃; controlling the molten steel top slag components: 38 percent of CaO; SiO 22:34%；Al2O3:8.2%；MgO:10%；
E. And (3) after the argon station is taken out of the station, the molten steel is sent to a billet caster for casting, the typical temperature of the molten steel in the casting process is controlled to be 1525 ℃, and the residual steel slag poured in the steel ladle is poured out after the molten steel in the steel ladle is cast for 6 min.
At this time, the weight of the ladle was reduced by 2.2t compared to 79.8t before cleaning.
In addition, after the twice recovered steel slag after casting is cooled, the recovered steel is processed and the recovery amount of the steel is compared. After the slag adhered to the steel ladle is cleaned, the residual steel amount is 320kg, 760kg is reduced compared with that before cleaning, and the residual steel amount of the steel ladle is greatly reduced.
Example 2:
and (3) smelting continuous 7-furnace casting slab aluminum killed steel (7-furnace SPHC-1R) after three-zone C02 steel ladle is online, and when 7-furnace casting is finished, finding that the molten steel cannot be completely discharged and the steel ladle casting allowance is large. After pouring the residual steel slag, the weight of an empty ladle of a No. C02 steel ladle is increased by 1.45t compared with 82.87t when the steel ladle is newly on line. When the ladle is packed and the nozzle is cleaned, the bottom of the ladle is found to be thick, the ladle is immediately arranged to be transferred to a furnace base for producing deformed steel bar, and the bottom of the ladle is cleaned according to the following steps:
smelting square-billet deformed steel HRB400E-0NbS in an A.8 #150T converter, wherein the end point temperature is 1630 ℃, and the end point carbon content is controlled to be 0.0806%;
B. conveying a steel ladle of No. C02 to a converter tapping position, adding 10kg of fluorite and 345kg of silicon carbide to the bottom of the steel ladle, and tapping after 1 min;
C. adding carbon powder and silicon-manganese alloy into a ladle after tapping for 30s from the converter, and adjusting the content of molten steel to be 0.234 percent of C; 0.43 percent of Si; 1.424 percent of Mn; 0.0030 percent of Alt, and controlling the flow of argon bottom blowing of the steel ladle to be 37m in the tapping process3/h；
D. After tapping, the ladle is transported to an argon blowing station for temperature and composition homogenization. Argon blowing time of the argon station: 13.45min, wherein the strong argon blowing (the exposed diameter of the molten steel surface is about 260 mm) is 12.33min, and the temperature of the argon outlet station is 1563 ℃. The molten steel top slag comprises the following components: 38.6 percent of CaO; SiO 22:33%；Al2O3:10%；MgO:7.28%；
E. And (4) after the argon station is taken out of the station, the argon station is sent to a billet caster for casting, the typical temperature of the molten steel in the casting process is controlled to 1520 ℃, and the residual steel slag poured in the steel ladle is poured out after the molten steel in the steel ladle is cast for 5 min.
At this time, the weight of the ladle at 82.57t was reduced by 1.75t compared to that before cleaning.
In addition, after the twice recovered steel slag after casting is cooled, the recovered steel is processed and the recovery amount of the steel is compared. After the slag adhered to the steel ladle is cleaned, the residual steel amount is 260kg, which is reduced by 550kg compared with that before cleaning, and the residual steel amount of the steel ladle is greatly reduced.
Claims (8)
1. A method for cleaning the bottom sticky slag of a steel ladle for producing slab aluminum killed steel is characterized by comprising the following steps:
A. smelting the square-billet deformed steel bar in a converter, controlling the end point temperature to be more than or equal to 1630 ℃, and controlling the end point carbon content to be 0.06-0.15%;
B. conveying the steel ladle with serious slag-sticking sediment at the ladle bottom to a converter tapping position, adding fluorite and silicon carbide to the ladle bottom of the steel ladle, and tapping;
C. adding carbon powder and silicon-manganese alloy into a steel ladle in the converter tapping process, and controlling the molten steel components: c is more than or equal to 0.2 percent; 0.2 to 0.6 percent of Si; 1.2 to 1.5 percent of Mn; alt is less than or equal to 0.0030 percent;
D. after tapping, the ladle is conveyed to an argon blowing station for argon blowing, and the top slag composition of the molten steel is controlled as follows: 35 to 40 percent of CaO and SiO2:30%～35%、Al2O3:≤10%、MgO:≤10%；
E. And (4) after the argon station is out of the station, sending the molten steel to a billet continuous casting machine for casting, controlling the temperature of the molten steel to be more than or equal to 1520 ℃ in the casting process, and pouring out the residual slag cast in the steel ladle after the molten steel in the steel ladle is cast.
2. The method for cleaning the ladle bottom sticky slag for slab aluminum killed steel production as claimed in claim 1, wherein: the dosage of the fluorite is more than 0 kg/furnace and less than or equal to 10 kg/furnace, and the dosage of the silicon carbide is 1.8kg/t molten steel to 10kg/t molten steel.
3. The method for cleaning the ladle bottom sticky slag for slab aluminum killed steel production as claimed in claim 1 or 2, characterized in that: and B, adding fluorite and silicon carbide to the bottom of the steel ladle, and tapping after 1 min.
4. The method for cleaning the ladle bottom sticky slag for slab aluminum killed steel production as claimed in claim 3, wherein: and after tapping for 30s by the converter, adding carbon powder and silicon-manganese alloy into a ladle.
5. The method for cleaning the ladle bottom sticky slag for slab aluminum killed steel production as claimed in claim 4, wherein: in the step C, controlling the flow of argon gas blown from the bottom of the steel ladle to be more than 25m in the tapping process3/h。
6. The method for cleaning the ladle bottom sticky slag for slab aluminum killed steel production as claimed in claim 5, wherein: in the step D, the argon blowing time is 10-20 min, and the temperature of the argon outlet station is 1560-1575 ℃.
7. The method for cleaning the ladle bottom sticky slag for producing the slab aluminum killed steel as claimed in claim 6, which is characterized in that: in the argon blowing process with the duration of 10min to 20min, the duration of strong argon blowing is more than or equal to 5 min.
8. The method for cleaning the ladle bottom sticky slag for slab aluminum killed steel production as claimed in claim 7, wherein: and E, pouring the ladle casting residues within 8 min after the ladle molten steel is cast.
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Effective date of registration: 20220830 Address after: 545002, 117 North Bird Road, the Guangxi Zhuang Autonomous Region, Liuzhou Patentee after: Liuzhou Iron&Steel Co.,Ltd. Patentee after: GUANGXI LIUZHOU IRON AND STEEL GROUP Co.,Ltd. Address before: 545002, 117 North Bird Road, the Guangxi Zhuang Autonomous Region, Liuzhou Patentee before: Liuzhou Iron&Steel Co.,Ltd. |