CN105950826A - Deoxidizing agent for refining slag of ladle refining furnace and use method thereof - Google Patents
Deoxidizing agent for refining slag of ladle refining furnace and use method thereof Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 122
- 238000007670 refining Methods 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000003795 chemical substances by application Substances 0.000 title description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 15
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 8
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 89
- 239000010959 steel Substances 0.000 claims description 89
- 238000007664 blowing Methods 0.000 claims description 52
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 42
- 229910052786 argon Inorganic materials 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 16
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 13
- 239000010436 fluorite Substances 0.000 claims description 13
- 238000011282 treatment Methods 0.000 claims description 12
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 11
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 11
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 11
- 229910052791 calcium Inorganic materials 0.000 claims description 11
- 239000011575 calcium Substances 0.000 claims description 11
- 239000004571 lime Substances 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 18
- 230000000694 effects Effects 0.000 abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 7
- 239000012535 impurity Substances 0.000 abstract description 6
- 230000003009 desulfurizing effect Effects 0.000 abstract description 3
- 238000009847 ladle furnace Methods 0.000 description 40
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910000616 Ferromanganese Inorganic materials 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000006477 desulfuration reaction Methods 0.000 description 5
- 230000023556 desulfurization Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- NCJRLCWABWKAGX-UHFFFAOYSA-N [Si].[Ca].[Ba] Chemical compound [Si].[Ca].[Ba] NCJRLCWABWKAGX-UHFFFAOYSA-N 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- ULGYAEQHFNJYML-UHFFFAOYSA-N [AlH3].[Ca] Chemical compound [AlH3].[Ca] ULGYAEQHFNJYML-UHFFFAOYSA-N 0.000 description 1
- WNQQFQRHFNVNSP-UHFFFAOYSA-N [Ca].[Fe] Chemical compound [Ca].[Fe] WNQQFQRHFNVNSP-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 210000003625 skull Anatomy 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009849 vacuum degassing Methods 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
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a deoxidizer of refining slag of a ladle refining furnace and a use method thereof, wherein the deoxidizer of the refining slag comprises the following components: CaCO3：10～30％，Al2O3: 30-60%, Al: 10-35%, and others: less than or equal to 5 percent, which are all mass percent. The refining slag deoxidizer is added in the slagging process of the ladle refining furnace, so that the refining slag has higher capabilities of desulfurizing and adsorbing impurities, and the TFe + MnO after slagging is less than 1%. The use method of the invention can ensure that the use of aluminum particles is cancelled on the basis of not reducing the refining effect of the ladle refining furnace, the cost is greatly reduced, and the existing process parameters are not required to be modified.
Description
Technical Field
The invention belongs to the technical field of low-cost refining, and particularly relates to a ladle refining furnace refining slag deoxidizer with low cost and a use method thereof.
Background
With the increasing requirements of users on the quality of steel products, a Ladle refining Furnace (Ladle Furnace, abbreviated as LF Furnace) is rapidly developed as a means for improving the cleanliness of molten steel and improving the quality of steel products, and is now an indispensable process in the short process of modern steel production. Besides adopting mature secondary refining technologies such as reducing atmosphere submerged arc heating, vacuum degassing, air brick argon blowing stirring and the like, the LF refining furnace also introduces a synthetic slag refining technology to achieve the purposes of desulfurization, deoxidation and even denitrification through a reasonable slagging process, thereby effectively absorbing impurities in steel, controlling the form of the impurities, and in addition, the LF refining furnace can also utilize foamed slag formed by steelmaking to submerge electric arcs, improve the heat efficiency and reduce the corrosion of refractory materials. Therefore, in the LF furnace refining process, a reasonable slagging process is adopted to play a crucial role in improving the cleanliness of molten steel.
For example, the general LF furnace process flow is as follows: the method comprises the steps of top-bottom converter, slag stopping and steel tapping (argon blowing in the whole process), argon blowing station, argon blowing, temperature measurement, oxygen determination, sampling, aluminum wire feeding, temperature measurement, oxygen determination and sampling, hoisting and transporting a ladle to a ladle car of an LF furnace refining station, entering a preparation position, temperature measurement, argon pre-blowing, ladle heating, slagging, component adjustment, sampling, temperature measurement and oxygen determination, wire feeding, soft argon blowing (calcium iron wire or calcium silicon wire), heat preservation and continuous casting.
The LF furnace refining mainly depends on white slag in a barrel, argon is blown into the barrel to stir in a low-oxygen atmosphere (the oxygen content is 5 percent), and molten steel passing through a primary refining furnace is heated by a graphite electrode to be refined. Because the argon stirring accelerates the chemical reaction between the slag and the steel, the electric arc heating is used for temperature compensation, the refining time can be ensured for a longer time, and thus, the oxygen and sulfur contents in the steel can be reduced.
The core technology of LF refining is steel slag refining, and the refining slag is required to have the following characteristics: (1) high reducibility; (2) high fluidity; (3) high sulfur capacity. Wherein the high reducibility is mainly obtained by adding deoxidizing agents such as aluminum particles and the like, commonly called 'white slag', and the smelting cost is limited by the cost of the deoxidizing agents; the high fluidity is mainly regulated by the addition of fluorite, more and more manufacturers in recent years regulate by the slag composition (calcium-aluminium ratio), and the high sulphur capacity is generally regulated by increasing the basicity (CaO/SiO) of the refining slag2) To be implemented.
At present, the deoxidizer of LF refining slag is mainly aluminum particles, which has the advantages of rapid deoxidation and stable slag components, but has the defect of high slagging cost. In recent years, some researchers have proposed new deoxidizers, such as aluminum slagging deoxidizing balls (patent CN1410557), ladle top slag deoxidizing modifier (patent CN103374642A), etc., but most of them have the problems of unstable slagging effect or insignificant cost reduction. Generally speaking, the whiter the color of the slag after slagging indicates more thorough deoxidation, and the slag with TFe + MnO < 1% is considered to be successful in slagging in the industry.
At present, the situation of the steel industry is extremely severe, and most steel companies are in the situation of micro-profit or loss. In order to improve the product competitiveness and seek for survival development under the situation of cold winter, on one hand, steel enterprises are required to develop market profit outwards, and on the other hand, the steel enterprises are required to improve quality and reduce cost inwards.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a deoxidizer for refining slag of a ladle refining furnace and a using method thereof, wherein the deoxidizer for refining slag of the ladle refining furnace (LF) is added in the slagging process of the LF furnace, so that the refining slag has higher capabilities of desulfurizing and adsorbing impurities, and TFe + MnO after slagging is less than 1%; the use method can ensure that the use of aluminum particles is eliminated on the basis of not reducing the LF refining effect, the cost is greatly reduced, and the existing process parameters are not required to be modified.
In order to achieve the purpose, the invention adopts the following technical scheme: a deoxidizer for refining slag of a ladle refining furnace comprises the following components: CaCO3：10～30％，Al2O3: 30-60%, Al: 10-35%, and others: less than or equal to 5 percent, which are all mass percent. CaCO3The components have the function of reducing the melting point of the composite slag.
Preferably, the granularity of the deoxidizer for the refining slag of the ladle refining furnace is 20-60 mm.
As a further optimization, the deoxidizer of the refining slag of the ladle refining furnace comprises the following components: lime: 20% of Al2O3: 52%, Al: 25%, others: 3 percent of the deoxidizer, and the granularity of the deoxidizer is 40 mm.
A using method of a deoxidizer of refining slag of a ladle refining furnace comprises the following steps:
A. pre-blowing argon in an LF (ladle furnace) station, and measuring the temperature;
B. electrifying the electrode, breaking slag and arcing; heating the slag shell on the surface of the steel ladle to a full melting state;
C. adding synthetic slag and small-particle lime in batches, and adding a proper amount of the LF refining slag deoxidizer during the adding; adding the synthetic slag and the small-particle lime in batches, and adding the synthetic slag and the small-particle lime in any batch at any time;
D. secondary power supply is carried out, the temperature of the molten steel is increased to a specific range, and meanwhile, complete melting of slag on the surface is ensured; the surface refers to the upper surface of the steel ladle, and the density of slag is smaller than that of molten steel, so that the slag completely floats on the upper surface of the steel ladle;
E. adjusting the bottom blowing flow of the steel ladle, stirring the molten steel to promote steel slag reaction, wherein the steel slag reaction period is the steel slag reaction period;
F. adjusting the bottom blowing flow of the steel ladle, and performing calcium treatment operation;
G. and adjusting the bottom blowing flow of the ladle, and performing soft blowing operation until the treatment is finished.
LF refining is mainly characterized in that molten steel is heated through an electrode, the electrode is inserted into slag, and after the electrode and the top slag are electrified, electric arcs begin to be generated, namely, arcing; the slag is heated and gradually changed from a sticky state to a state with better fluidity, which is called slag breaking.
The soft blowing operation is a process of carrying out temperature and uniform components only by bottom blowing of the steel ladle after all refining operations of the steel ladle are finished.
As a further preference, in the step A, the ladle refining furnace enters the station and is pre-blown with argon for 1-3 min.
As a further preferred example, in the step B, the heating to melt the ladle surface skull specifically includes: heating the slag shell on the surface of the steel ladle to a full melting state after heating for 1-2 min.
Preferably, in the step C, the adding amount of the slag in each batch is less than or equal to 1500kg, and the interval time between two adjacent batches is more than or equal to 1 min.
Preferably, in the step C, synthetic slag and small-particle lime are added in batches, and a proper amount of the LF refining slag deoxidizer is added in one batch.
Further preferably, in step C, fluorite is added to adjust the fluidity of the slag according to the slag condition, and the fluorite is used as a fluxing agent to achieve the purpose of rapid slag formation.
Preferably, fluorite is added in the step C in an amount of 100-250 kg per ton of steel.
Preferably, in the step C, the amount of the LF refining slag deoxidizer added is 300-500 kg/ton steel.
Preferably, in step D, the temperature of the molten steel is increased to 1575 ℃ or higher.
Preferably, in the step E, the ladle bottom blowing flow is set to be 1000-1200 Nl/min, and the time is 5-10 min.
Preferably, in the step F, the ladle bottom blowing flow is set to be 200-400 Nl/min, and the calcium linear quantity is 300-400 m/ton of steel.
Preferably, in the step G, the ladle bottom blowing flow rate is set to be 50-100 Nl/min, and the time is 5-10 min.
During the different treatments, for example: during the reaction of the steel slag in the step E, the calcium treatment in the step F and the soft blowing in the step G, different argon flows are adopted in the method.
Further preferably, after the above steps, the content of TFe + MnO after slagging is 0.4-0.7%, and the color of slag is white.
As a further preference, the addition amount of other alloys is the same as that in the prior art, and the addition period can be adjusted according to the chemical composition requirements of different steel types. For example, ferrosilicon, silicocalcium barium and high-carbon ferromanganese can be added in sequence for deoxidation alloying, and the respective addition amounts are as follows: 7.1-9.4 kg of high-carbon ferromanganese per ton steel, 2.0-2.5 kg of silicon-calcium-barium per ton steel and 2.5-23.5 kg of silicon-iron per ton steel. The fluorite, the ferrosilicon, the silicon-calcium-barium and the high-carbon ferromanganese are all commercial products.
The invention has the following beneficial effects:
1. the deoxidizer of the refining slag of the ladle refining furnace is suitable for any steel grade which can be produced by an LF process, such as pipeline steel, wheel steel and the like.
2. After the deoxidizer for the refining slag of the ladle refining furnace is used for slagging, the TFe + MnO content is less than 1 percent, and the slagging is successful.
3. The deoxidizer for refining slag of the ladle refining furnace has simple operation and does not need to modify the prior process parameters in the process of slagging.
4. The using method of the invention greatly reduces the cost while ensuring the refining effect of the ladle refining furnace, and after a certain domestic factory adopts the using method of the invention, the refining cost of the ladle refining furnace is reduced by 2.5 yuan per ton of steel, and the annual benefit can reach 550 ten thousand yuan. Can realize industrialized popularization.
Drawings
FIG. 1 is a flow chart of a method for using deoxidizer for refining slag of a ladle refining furnace in an embodiment of the application.
Detailed Description
The ladle refining furnace refining slag deoxidizer is added in the LF slagging process, so that the refining slag has higher capabilities of desulfurizing and adsorbing impurities. The method can ensure that the use of aluminum particles is cancelled on the basis of not reducing the refining effect of the ladle refining furnace, the cost is greatly reduced, and the existing technological parameters do not need to be modified.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
The low-cost LF refining slag deoxidizer comprises the following components: CaCO3(lime): 10 to 30% of Al2O3: 30-60%, Al: 10-35%, and others: less than or equal to 5 percent, which are all mass percent.
The granularity of the LF refining slag deoxidizer is 20-60 mm.
LF refining slag deoxidizer example 1: comprises the following components: CaCO3：10％，Al2O3: 50%, Al: 35%, others: 5 percent of the deoxidizer, and the granularity of the deoxidizer is 30 mm.
LF refining slag deoxidizer example 2: comprises the following components: CaCO3：20％，Al2O3: 52%, Al: 25%, others: 3 percent of the deoxidizer, and the granularity of the deoxidizer is 40 mm.
LF refining slag deoxidizer example 3: comprises the following components: CaCO3：30％，Al2O3: 40%, Al: 28%, others: 2 percent of the deoxidizer, and the granularity of the deoxidizer is 60 mm.
The application method of the low-cost LF refining slag deoxidizer comprises the following steps:
A. pre-blowing argon in an LF (ladle furnace) station, measuring the temperature and sampling;
B. electrifying the electrode, breaking slag and arcing; heating the slag shell on the surface of the steel ladle to a full melting state;
C. adding synthetic slag and small-particle lime in batches, and adding a proper amount of the LF refining slag deoxidizer in one batch;
D. electrifying the electrode for the second time, increasing the temperature of the molten steel to a specific range, and simultaneously ensuring that slag on the upper surface of the steel ladle is completely melted;
E. adjusting the bottom blowing flow of the steel ladle, stirring the molten steel to promote steel slag reaction, wherein the steel slag reaction period is the steel slag reaction period;
F. adjusting the bottom blowing flow of the steel ladle, and performing calcium treatment operation;
G. and adjusting the bottom blowing flow of the ladle, and performing soft blowing operation until the treatment is finished.
Wherein,
in the step A, argon is pre-blown for 1-3 min.
And in the step B, heating the slag shell on the surface of the steel ladle to a full melting state for 1-2 min.
In the step C, the adding amount of the slag in each batch is less than or equal to 1500kg, and the interval time between two adjacent batches is more than or equal to 1 min.
In the step C, according to the slag condition, fluorite can be added to adjust the fluidity of the slag, and the fluorite is used as a fluxing agent and can achieve the purpose of rapid slagging.
And C, adding fluorite in an amount of 100-250 kg per ton of steel.
And C, adding 300-500 kg of LF refining slag deoxidizer per ton of steel.
In step D, the temperature of the molten steel is increased to over 1575 ℃.
In the step E, the bottom blowing flow is set to be 1000-1200 Nl/min, and the time is 5-10 min.
In the step F, the bottom blowing flow is set to be 200-400 Nl/min, and the calcium linear amount is 300-400 m/ton steel.
In the step G, the bottom blowing flow is set to be 50-100 Nl/min, and the time is 5-10 min.
Bottom-blown argon stirring is the main factor influencing the LF desulfurization speed. The stirring function mainly aims at improving the mass transfer coefficient, enlarging the slag-steel contact area, promoting the floating of impurities and further improving the desulfurization capability. Certainly, if the argon blowing amount is too large, the fluctuation of a slag layer is too large, and even molten steel is exposed, so that secondary oxidation is caused, and the desulfurization effect is seriously influenced; too strong stirring is also unfavorable for desulfurization, the oxygen level of molten steel can be increased, and the sulfur balance distribution of slag steel is reduced.
During the different treatments, for example: during the reaction of the steel slag in the step E, the calcium treatment in the step F and the soft blowing in the step G, different argon flows are adopted in the embodiment of the application.
The addition amount of other alloys is the same as that in the prior art, and the addition period can be in the step D or E according to the chemical composition requirements of different steel types. For example, ferrosilicon, silicocalcium barium and high-carbon ferromanganese can be added in sequence for deoxidation alloying, and the respective addition amounts are as follows: 7.1-9.4 kg of high-carbon ferromanganese per ton steel, 2.0-2.5 kg of silicon-calcium-barium per ton steel and 2.5-23.5 kg of silicon-iron per ton steel. The lime, the ferrosilicon, the silicon-calcium-barium and the high-carbon ferromanganese are all commercial products.
The method in the embodiment of the application has already realized industrial popularization in the technological process of '300 t converter blowing (semi-killed tapping) → 300tLF refining → continuous casting' in a certain large-scale steel mill in China, and takes a typical heat of 3 furnaces as an example.
Test Heat 1: pre-blowing argon for 3min when the LF enters a station, adding slag charge for 2.1t in two batches after slagging, and keeping the interval for 1.5 min; then 200kg of fluorite and 350kg of refining slag deoxidizer are added; electrifying the electrode and heating to 1577 ℃; adjusting the bottom blowing flow of the steel ladle to 1000Nl/min for 10 min; adjusting the bottom blowing flow of the ladle to 300Nl/min, and feeding the calcium linear quantity to 320 m; and adjusting the bottom blowing flow of the steel ladle to 50Nl/min, and performing soft blowing operation until the treatment is finished. The TFe + MnO content after the heat slagging is 0.7%; the color of the slag is white.
Test heat 2: pre-blowing argon for 3min when the LF enters a station, adding slag charge for 1.8t in two batches after slagging, and keeping the interval for 1.5 min; then adding 100kg of fluorite and 370kg of refining slag deoxidizer; electrifying the electrode and heating to 1581 ℃; adjusting the bottom blowing flow of the steel ladle to 1000Nl/min for 7 min; adjusting the bottom blowing flow of the ladle to 300Nl/min, and feeding the calcium line amount to 280 m; and adjusting the bottom blowing flow of the steel ladle to 50Nl/min, and performing soft blowing operation until the treatment is finished. The TFe + MnO content after the heat slagging is 0.6%; the color of the slag is white.
Test Heat 3: pre-blowing argon for 3min when the LF enters a station, adding slag charge for 1.9t in two batches after slagging, and keeping the interval for 1.5 min; then 240kg of fluorite and 310kg of refining slag deoxidizer are added; electrifying the electrode and heating to 1579 ℃; adjusting the bottom blowing flow of the steel ladle to 1200Nl/min for 6 min; adjusting the bottom blowing flow of the steel ladle to 400Nl/min, and feeding the calcium linear quantity to 380 m; and adjusting the bottom blowing flow of the steel ladle to 50Nl/min, and performing soft blowing operation until the treatment is finished. The TFe + MnO content after the heat slagging is 0.4%; the color of the slag is white.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
1. the LF refining slag deoxidizer in the embodiment of the application is suitable for any steel grade which can be produced by an LF process, such as pipeline steel, wheel steel and the like.
2. After the deoxidizer for the LF refining slag is used for slagging, the TFe + MnO is less than 1%, and slagging is successful.
3. The LF refining slag deoxidizer provided by the embodiment of the application has the advantages that the operation is simple, and the existing technological parameters are not required to be modified.
4. The use method of the embodiment of the application ensures the LF refining effect, and meanwhile, the cost is greatly reduced, after a certain domestic factory adopts the use method of the embodiment of the application, the LF refining cost is reduced by 2.5 yuan per ton of steel, the annual benefit can reach 550 ten thousand yuan, and the industrial popularization can be realized.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A deoxidizer for refining slag of a ladle refining furnace is characterized in that: the refining slag deoxidizer comprises the following components in percentage by weight: CaCO3：10～30％，Al2O3: 30-60%, Al: 10-35%, and others: less than or equal to 5 percent by mass percent; the granularity of the refining slag deoxidizer is 20-60 mm.
2. A method for using a deoxidizer for a refining slag of a ladle refining furnace according to claim 1, which is characterized in that: the using method comprises the following steps:
A. pre-blowing argon when the ladle refining furnace enters a station, and measuring the temperature;
B. electrifying the electrode, breaking slag and arcing; heating the slag shell on the surface of the steel ladle to a molten state;
C. adding synthetic slag and small-particle lime in batches, and adding the refining slag deoxidizer in batches;
D. electrifying the electrode for the second time, increasing the temperature of the molten steel, and ensuring the slag materials on the upper surface of the steel ladle to be melted;
E. adjusting the bottom blowing flow of the steel ladle, and stirring the molten steel to promote the reaction of the steel slag;
F. adjusting the bottom blowing flow of the steel ladle, and performing calcium treatment operation;
G. and adjusting the bottom blowing flow of the ladle and performing soft blowing operation.
3. The use method of the deoxidizer for the refining slag of the ladle refining furnace, which is characterized by comprising the following steps of: in the step A, the ladle refining furnace enters the station for argon pre-blowing for 1-3min, and in the step B, the heating to heat the slag shell on the surface of the ladle to a melting state specifically comprises the following steps: heating the slag shell on the surface of the steel ladle to a full melting state after heating for 1-2 min.
4. The use method of the deoxidizer for the refining slag of the ladle refining furnace, which is characterized by comprising the following steps of: in the step C, when the synthetic slag and the small-particle lime are added in batches, the adding amount of each batch of slag is less than or equal to 1500kg, and the interval time between two adjacent batches of slag is more than or equal to 1 min.
5. The use method of the deoxidizer for the refining slag of the ladle refining furnace, which is characterized by comprising the following steps of: in step C, when the synthetic slag and the small-sized lime are added in batches, the method further comprises: adding fluorite, wherein the amount of the fluorite is 100-250 kg per ton of steel.
6. The use method of the deoxidizer for the refining slag of the ladle refining furnace, which is characterized by comprising the following steps of: in the step C, the amount of the refining slag deoxidizer is 300-500 kg/ton steel.
7. The use method of the deoxidizer for the refining slag of the ladle refining furnace, which is characterized by comprising the following steps of: in the step E, the ladle bottom blowing flow is set to be 1000-1200 Nl/min, and the time is 5-10 min.
8. The use method of the deoxidizer for the refining slag of the ladle refining furnace, which is characterized by comprising the following steps of: in the step F, the bottom blowing flow of the steel ladle is set to be 200-400 Nl/min, and the calcium dosage is 300-400 m/ton of steel.
9. The use method of the deoxidizer for the refining slag of the ladle refining furnace, which is characterized by comprising the following steps of: and G, setting the bottom blowing flow of the steel ladle to be 50-100 Nl/min, and setting the time to be 5-10 min.
10. The use method of the deoxidizer for the refining slag of the ladle refining furnace, which is characterized by comprising the following steps of: after slagging by adopting the using method, the content of TFe + MnO is 0.4-0.7%, and the color of slag is white.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108018398A (en) * | 2016-10-28 | 2018-05-11 | 上海梅山钢铁股份有限公司 | A kind of ladle top slag for ultra-low-carbon steel deoxidation modification agent and its application method |
| CN108504820A (en) * | 2018-04-28 | 2018-09-07 | 河钢股份有限公司承德分公司 | A kind of LF refining method of Aluminum steel |
| CN111893248A (en) * | 2020-09-07 | 2020-11-06 | 攀钢集团攀枝花钢钒有限公司 | Refining slagging agent and preparation method and use method thereof |
| CN114182063A (en) * | 2021-12-13 | 2022-03-15 | 商丘市商鼎耐火材料有限公司 | Use method of deoxidizer for refining and using aluminum ash as raw material |
| CN115061522A (en) * | 2022-05-25 | 2022-09-16 | 广东韶钢松山股份有限公司 | LF temperature control method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101503747A (en) * | 2009-03-12 | 2009-08-12 | 浙江杭美炉料制造有限公司 | Heating steel slag washing material for converter steel melting, preparation and use method |
| CN101629224A (en) * | 2009-08-04 | 2010-01-20 | 重庆科健冶金材料有限公司 | Deoxidation modification agent of molten steel |
| CN102181605A (en) * | 2011-04-07 | 2011-09-14 | 重庆钢铁(集团)有限责任公司 | Molten steel deoxidizing modifier |
| CN102747189A (en) * | 2012-07-25 | 2012-10-24 | 洛阳市科丰冶金新材料（集团）有限公司 | Composite refining slag for refining molten steel |
| CN102747190A (en) * | 2012-07-30 | 2012-10-24 | 重庆钢铁(集团)有限责任公司 | Deoxygenation modifier for molten steel |
| CN104278130A (en) * | 2014-09-23 | 2015-01-14 | 商洛学院 | Process of quickly regulating alkalinity of LF (ladle furnace) slag |
-
2016
- 2016-05-05 CN CN201610292807.6A patent/CN105950826B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101503747A (en) * | 2009-03-12 | 2009-08-12 | 浙江杭美炉料制造有限公司 | Heating steel slag washing material for converter steel melting, preparation and use method |
| CN101629224A (en) * | 2009-08-04 | 2010-01-20 | 重庆科健冶金材料有限公司 | Deoxidation modification agent of molten steel |
| CN102181605A (en) * | 2011-04-07 | 2011-09-14 | 重庆钢铁(集团)有限责任公司 | Molten steel deoxidizing modifier |
| CN102747189A (en) * | 2012-07-25 | 2012-10-24 | 洛阳市科丰冶金新材料（集团）有限公司 | Composite refining slag for refining molten steel |
| CN102747190A (en) * | 2012-07-30 | 2012-10-24 | 重庆钢铁(集团)有限责任公司 | Deoxygenation modifier for molten steel |
| CN104278130A (en) * | 2014-09-23 | 2015-01-14 | 商洛学院 | Process of quickly regulating alkalinity of LF (ladle furnace) slag |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108018398A (en) * | 2016-10-28 | 2018-05-11 | 上海梅山钢铁股份有限公司 | A kind of ladle top slag for ultra-low-carbon steel deoxidation modification agent and its application method |
| CN108504820A (en) * | 2018-04-28 | 2018-09-07 | 河钢股份有限公司承德分公司 | A kind of LF refining method of Aluminum steel |
| CN111893248A (en) * | 2020-09-07 | 2020-11-06 | 攀钢集团攀枝花钢钒有限公司 | Refining slagging agent and preparation method and use method thereof |
| CN114182063A (en) * | 2021-12-13 | 2022-03-15 | 商丘市商鼎耐火材料有限公司 | Use method of deoxidizer for refining and using aluminum ash as raw material |
| CN115061522A (en) * | 2022-05-25 | 2022-09-16 | 广东韶钢松山股份有限公司 | LF temperature control method |
| CN115061522B (en) * | 2022-05-25 | 2024-04-02 | 广东韶钢松山股份有限公司 | LF temperature control method |
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