CN115652027B - LF furnace rapid slag forming composite sphere and preparation and use method thereof - Google Patents
LF furnace rapid slag forming composite sphere and preparation and use method thereof Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 140
- 239000002131 composite material Substances 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 64
- 239000010959 steel Substances 0.000 claims abstract description 64
- 238000010079 rubber tapping Methods 0.000 claims abstract description 57
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 36
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 31
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 31
- 239000004571 lime Substances 0.000 claims abstract description 31
- 230000008569 process Effects 0.000 claims abstract description 31
- 238000007670 refining Methods 0.000 claims abstract description 28
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000003756 stirring Methods 0.000 claims abstract description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000292 calcium oxide Substances 0.000 claims abstract description 20
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 19
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 18
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 18
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 18
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 18
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 16
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 12
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 36
- 239000000843 powder Substances 0.000 claims description 32
- 239000002994 raw material Substances 0.000 claims description 30
- 238000002156 mixing Methods 0.000 claims description 22
- 229910052786 argon Inorganic materials 0.000 claims description 18
- 238000007664 blowing Methods 0.000 claims description 18
- 239000008187 granular material Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 17
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 12
- 239000008188 pellet Substances 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 10
- 238000006477 desulfuration reaction Methods 0.000 abstract description 7
- 230000023556 desulfurization Effects 0.000 abstract description 7
- 238000003723 Smelting Methods 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000005275 alloying Methods 0.000 abstract description 3
- 239000010931 gold Substances 0.000 abstract description 3
- 229910052737 gold Inorganic materials 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 230000003009 desulfurizing effect Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000009847 ladle furnace Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
Classifications
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 relates to a quick slag forming composite sphere of an LF furnace and a preparation and use method thereof, wherein the quick slag forming composite sphere comprises the following components: 40 to 60 percent of calcium oxide, 5 to 15 percent of calcium hydroxide, 15 to 25 percent of calcium carbonate, 5 to 10 percent of magnesium oxide, 5 to 10 percent of aluminum oxide and 10 to 20 percent of metallic aluminum. According to the invention, in the converter tapping process, LF rapid slag formation composite spheres and small lime are added, micro bubbles and fine slag drops are released by decomposing the high Wen Cujin composite spheres of molten steel in the converter tapping process, a slag-gold reaction interface is increased, the dynamic conditions of smelting reaction are improved, the formation of a high-alkalinity, low-oxidability and high-fluidity refining slag system is facilitated, slag formation is not needed after the molten steel enters the LF furnace, and the rapid slag formation of the LF furnace is realized by only heating, stirring, desulfurization and alloying.
Description
Technical Field
The invention relates to the field of ferrous metallurgy, in particular to a rapid slag forming composite sphere of an LF furnace and a preparation and use method thereof.
Background
Sulfur is one of the deleterious elements in steel, which is a surface active element, and is usually present in the form of sulfides (Mn, fe) S at grain boundaries or heterogeneous interfaces of steel, which causes great harm to the quality of most steels, and therefore, the sulfur content in steel is reduced as much as possible in production.
The LF furnace is called LadleFurnace, namely a ladle refining furnace, and has the main functions of deoxidizing and desulfurizing molten steel in a reducing atmosphere, adjusting the components and the temperature of the molten steel and removing inclusions in the steel. With the continuous improvement of the steel quality requirements of users, LF refining technology is rapidly developed. In the LF refining process, stable reducing atmosphere in the furnace is created by reasonably making white foam slag, so that the purposes of desulfurizing, deoxidizing and removing impurities are achieved, the impurities in molten steel can be fully absorbed and denatured, and the components and the temperature of the molten steel can be accurately controlled. However, problems of long slag melting time, long arc stabilizing time, slow white slag formation, high energy consumption and the like commonly exist in the refining process of the LF furnace.
The existing technologies of optimizing slag system, LF slagging forward and the like aim to realize rapid slagging, thereby improving LF refining efficiency and desulfurization effect, and the following problems still exist although a certain application effect is obtained:
1. optimizing slag system technology: the selection of the refining slag system is directly related to refining operation and molten steel quality; so far, the CaO-CaF is more commonly used 2 、CaO-A1 2 O 3 、CaO-A1 2 O 3 -CaF 2 And CaO-A1 2 0 3 -SiO 2 The method is characterized in that the basic refining slag system has a certain improvement effect on LF refining efficiency and desulfurization effect by adjusting the component proportion and optimizing the slag system, but all slag materials are added in the LF furnace process once or multiple times, and particularly under the condition of higher sulfur content of molten steel, the use amount of the slag materials needs to be increased, so that the cost is increased, the operation difficulty of the LF furnace is increased, and the desulfurization effect and efficiency of a refining link are not facilitated.
2. LF slag making forward technology: the slag-making advancing technology is that slag is made in advance in steel ladle through tapping process, and slag is made continuously in tapping and converter-LF furnace transferring process, slag making is not needed again after the slag is fed into the LF furnace, aluminium material is directly added for slag-making modification, thus achieving the purposes of saving LF processing time, improving LF desulfurization efficiency and removing impurities in steel by slag. However, the slag adopted by the prior LF slag making forward technology is lime and fluxing agent (fluorite, refining slag and the like), and because the slag is mainly lime, the phenomena of sticky top slag, cover bonding and the like are easy to occur, thereby bringing difficulty to LF treatment and prolonging the treatment time.
The Chinese patent application No. CN202111409378.3 discloses a quick slagging method of LF furnace for smelting hot rolled ribbed steel bar, which adds the pressed aluminum ash and active lime into ladle during ladle furnace refining to control refined CaO-SiO 2 -Al 2 O 3 Al in slag system 2 O 3 The content of the slag is 15-25%, and the slag alkalinity is 0.7-1.2, so that the rapid slagging in the initial stage of LF refining is realized. The method can further accelerate the slag forming speed in the refining process by utilizing F, cl and Na ions in salt substances in the aluminum ash, and accelerate the removal of oxygen elements in refined slag by utilizing Al deoxidized substances in the aluminum ash, thereby improving the desulfurization speed of slag, effectively shortening the smelting refining period, and improving the stability and the molten steel quality in the molten steel refining production process. Although the method has a certain effect on LF rapid slag formation, the method belongs to an optimized slag system technology, slag materials are added in an LF process, and the rapid slag formation effect is limited.
In a word, the existing LF rapid slag forming technology mainly comprises an optimized slag system technology and an LF slag making forward technology, and although the two technological methods have certain effects on LF rapid slag forming, the two technological methods have the defects, wherein the optimized slag system technology does not change the traditional slag forming technology, slag materials are added in an LF process, and the rapid slag forming effect is not ideal; in the LF slag making forward technology, because slag is mainly lime, slag on the top is easy to become sticky, cover, and the like, thereby bringing difficulty to LF processing and prolonging refining time.
Disclosure of Invention
The invention provides a quick slag forming composite sphere of an LF furnace and a preparation and use method thereof, wherein in the tapping process of a converter, the quick slag forming composite sphere of the LF furnace and small lime are added, and tiny bubbles and tiny slag drops are released by decomposing the high Wen Cujin composite sphere of molten steel in the tapping process of the converter, so that a slag-gold reaction interface is increased, the dynamics condition of smelting reaction is improved, a refining slag system with high alkalinity, low oxidability and high fluidity is formed, slag formation is not needed after the steel enters the LF furnace, and the quick slag forming of the LF furnace is realized only by heating, stirring, desulfurizing and alloying.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the quick slag forming composite sphere of the LF furnace comprises the following components in percentage by weight: 40 to 60 percent of calcium oxide, 5 to 15 percent of calcium hydroxide, 15 to 25 percent of calcium carbonate, 5 to 10 percent of magnesium oxide, 5 to 10 percent of aluminum oxide and 10 to 20 percent of metallic aluminum.
Further, the diameter of the rapid slag forming composite sphere is 10-30 mm.
Further, the melting point of the rapid slag formation composite sphere is 1100-1300 ℃, the alkalinity is more than or equal to 6, and the compressive strength is 20-50 MPa.
A preparation method of a quick slag forming composite sphere of an LF furnace comprises the following steps:
1) Preparing raw materials:
lime powder with granularity of 1-4 mm, and calcium oxide with weight percentage content of more than or equal to 92%;
calcium hydroxide powder with the granularity of 0.1-1 mm, wherein the weight percentage content of calcium hydroxide is more than or equal to 95%;
calcium carbonate powder with the granularity of 0.1-0.2 mm, wherein the weight percentage content of the calcium carbonate is more than or equal to 85%;
magnesium oxide powder with granularity of 1-5 mm, wherein the weight percentage content of magnesium oxide is more than or equal to 90%;
alumina powder with granularity of 0.1-0.5 mm, and alumina content of more than or equal to 90 wt%;
metal aluminum powder with granularity of 0.1-0.5 mm, wherein the weight percentage content of aluminum is more than or equal to 96%;
2) Mixing the raw materials according to the proportion of the components, spraying water accounting for 1% -3% of the total weight of the raw materials, and carrying out mixing grinding in a mixing mill to obtain a raw material mixture;
3) Pressing the raw material mixture into green pellets by adopting a dry method;
4) And (3) drying the green pellets at 100-200 ℃ for 3-6 hours, and cooling to room temperature to obtain the rapid slag forming composite spheres.
The application method of the quick slag forming composite sphere of the LF furnace comprises the steps of mixing the quick slag forming composite sphere with lime granules, and adding the mixture into molten steel in the tapping process of a converter to realize quick slag forming in LF refining; the addition amount of the rapid slag forming composite sphere is 5-15 kg/t steel, and the mixing weight ratio of the rapid slag forming composite sphere to the lime granules is 1-3:1; when the adding time of the rapid slag forming composite sphere is that the tapping amount of the LF furnace reaches 10% -30%, the rapid slag forming composite sphere is added near the tapping flow at one time.
Further, the granularity of the lime granules is 5-15 mm, and the content of calcium oxide is more than or equal to 90%.
Further, in the tapping process of the LF furnace, the ladle is subjected to strong bottom blowing stirring, wherein the argon flow during the strong bottom blowing stirring is 100-500 Nl/min, and the strong bottom blowing stirring is from the beginning of tapping to the end of tapping; after tapping, stirring for 1-3 min with weak argon blowing, wherein the argon flow during stirring is 10-40 Nl/min.
Further, the temperature of molten steel during converter tapping is more than or equal to 1650 ℃, and the oxygen content [ O ] of the molten steel is less than or equal to 0.05%.
Compared with the prior art, the invention has the beneficial effects that:
1) The LF furnace rapid slag forming composite sphere can decompose and release tiny bubbles and tiny slag drops at high temperature, increases the reaction interface of slag and gold, and can rapidly form a refining slag system with high alkalinity, low oxidability and high fluidity.
2) In the tapping process of the converter, the LF furnace is added to form slag quickly, and the composite sphere and the small lime are added, so that slag formation is not needed after the slag enters the LF furnace, and only heating, stirring, desulfurization and alloying are needed, thereby realizing the high-efficiency quick slag formation of the LF furnace.
3) The composite powder of CaO, mgO or (CaO+MgO) is used as the carrier of carbonate and hydroxide powder, the thermal stability of the carbonate and the hydroxide in molten steel is improved by the combination of the two, and the LF rapid slag forming composite sphere has low melting point and high strength, thereby being beneficial to transportation, storage and application.
4) The preparation process of the LF furnace rapid slag formation composite sphere is simple, and the use and the operation are convenient; the rapid slagging of the LF furnace with low cost and high efficiency is realized.
Detailed Description
The invention relates to a rapid slag forming composite sphere of an LF furnace, which comprises the following components in percentage by weight: 40 to 60 percent of calcium oxide, 5 to 15 percent of calcium hydroxide, 15 to 25 percent of calcium carbonate, 5 to 10 percent of magnesium oxide, 5 to 10 percent of aluminum oxide and 10 to 20 percent of metallic aluminum.
Further, the diameter of the rapid slag forming composite sphere is 10-30 mm.
Further, the melting point of the rapid slag formation composite sphere is 1100-1300 ℃, the alkalinity is more than or equal to 6, and the compressive strength is 20-50 MPa.
The invention discloses a preparation method of a rapid slag forming composite sphere of an LF furnace, which comprises the following steps:
1) Preparing raw materials:
lime powder with granularity of 1-4 mm, and calcium oxide with weight percentage content of more than or equal to 92%;
calcium hydroxide powder with the granularity of 0.1-1 mm, wherein the weight percentage content of calcium hydroxide is more than or equal to 95%;
calcium carbonate powder with the granularity of 0.1-0.2 mm, wherein the weight percentage content of the calcium carbonate is more than or equal to 85%;
magnesium oxide powder with granularity of 1-5 mm, wherein the weight percentage content of magnesium oxide is more than or equal to 90%;
alumina powder with granularity of 0.1-0.5 mm, and alumina content of more than or equal to 90 wt%;
metal aluminum powder with granularity of 0.1-0.5 mm, wherein the weight percentage content of aluminum is more than or equal to 96%;
2) Mixing the raw materials according to the proportion of the components, spraying water accounting for 1% -3% of the total weight of the raw materials, and carrying out mixing grinding in a mixing mill to obtain a raw material mixture;
3) Pressing the raw material mixture into green pellets by adopting a dry method;
4) And (3) drying the green pellets at 100-200 ℃ for 3-6 hours, and cooling to room temperature to obtain the rapid slag forming composite spheres.
According to the application method of the quick slag forming composite sphere of the LF furnace, the quick slag forming composite sphere is mixed with lime granules, and the mixture is added into molten steel in the tapping process of a converter, so that quick slag forming in LF refining is realized; the addition amount of the rapid slag forming composite sphere is 5-15 kg/t steel, and the mixing weight ratio of the rapid slag forming composite sphere to the lime granules is 1-3:1; when the adding time of the rapid slag forming composite sphere is that the tapping amount of the LF furnace reaches 10% -30%, the rapid slag forming composite sphere is added near the tapping flow at one time.
Further, the granularity of the lime granules is 5-15 mm, and the content of calcium oxide is more than or equal to 90%.
Further, in the tapping process of the LF furnace, the ladle is subjected to strong bottom blowing stirring, wherein the argon flow during the strong bottom blowing stirring is 100-500 Nl/min, and the strong bottom blowing stirring is from the beginning of tapping to the end of tapping; after tapping, stirring for 1-3 min with weak argon blowing, wherein the argon flow during stirring is 10-40 Nl/min.
Further, the temperature of molten steel during converter tapping is more than or equal to 1650 ℃, and the oxygen content [ O ] of the molten steel is less than or equal to 0.05%.
The unnoticed amounts in the present invention are all weight percent.
The following examples are given by way of illustration of detailed embodiments and specific procedures based on the technical scheme of the present invention, but the scope of the present invention is not limited to the following examples.
[ example 1 ]
In the embodiment, a 260tLF refining furnace is adopted in a certain steel mill, and an LF furnace rapid slag forming test is carried out by using an LF furnace rapid slag forming composite sphere, wherein the test steel grade is QB steel grade.
The preparation process of the LF furnace rapid slag forming composite sphere comprises the following steps:
1) Raw material preparation: lime powder with granularity of 1mm and calcium oxide content of 92%; the granularity of the calcium hydroxide powder is 0.1mm, and the content of calcium hydroxide is 95%; the granularity of the calcium carbonate powder is 0.1mm, and the content of calcium carbonate is 85%; the granularity of the magnesia powder is 1mm, and the magnesia content is 90%; alumina powder particle size of 0.1mm and alumina content of 90%; the granularity of the aluminum powder is 0.1mm, and the aluminum content is 96%.
2) The weight percentages are as follows: the raw materials are mixed, sprayed with water accounting for 1 percent of the total weight of the raw materials, and then mixed and ground in a mixing mill to obtain a raw material mixture.
3) The raw material mixture is placed in a high-pressure granulator and pressed into green pellets by adopting a dry method.
4) And (3) putting the green pellets into a drying kiln, drying at 100 ℃ for 6 hours, and cooling to room temperature to obtain the LF furnace rapid slag forming composite spheres.
The diameter of the LF furnace rapid slag forming composite sphere prepared in the embodiment is 10mm, the melting point is 1100 ℃, the alkalinity is 6, and the compressive strength is 20MPa.
The use process of the LF furnace rapid slag forming composite sphere is as follows:
mixing the LF furnace rapid slag forming composite sphere with lime granules, and adding the mixture into molten steel meeting the use conditions in the tapping process of a converter, wherein the tapping parameters of the converter are as follows: molten steel temperature 1650 ℃, molten steel oxygen content [ O ] =0.045%.
The granularity of the lime granules is 5mm, and the calcium oxide content is 90%; the addition amount of the LF furnace rapid slag forming composite sphere is 5kg/t steel, and the mixing ratio of the LF furnace rapid slag forming composite sphere and lime granules is 1:1.
When the adding time of the quick slag forming composite sphere of the LF furnace is 10% of the tapping amount of the converter, the quick slag forming composite sphere is added through an alloy chute at one time, and the adding position is near the tapping flow.
In the tapping process, the steel ladle is subjected to strong bottom blowing stirring, the flow of argon is 100Nl/min, and the tapping is started to the tapping end. After tapping, stirring was performed for 1 minute with weak argon blowing, and the flow rate of argon was 10Nl/min.
In this example, the test heat was 3 heats, the LF treatment time was 37.12 minutes on average, and the heating rate was 6.42 ℃/min on average.
[ example 2 ]
In the embodiment, a 260tLF refining furnace is adopted in a certain steel mill, and an LF furnace rapid slag forming test is carried out by using an LF furnace rapid slag forming composite sphere, wherein the test steel grade is QB steel grade.
The preparation process of the LF furnace rapid slag forming composite sphere comprises the following steps:
1) Raw material preparation: lime powder with granularity of 2mm and calcium oxide content of 93%; the granularity of the calcium hydroxide powder is 0.5mm, and the content of calcium hydroxide is 96%; the granularity of the calcium carbonate powder is 0.1mm, and the calcium carbonate content is 87%; the granularity of the magnesia powder is 1mm, and the magnesia content is 92%; alumina powder particle size of 0.2mm and alumina content of 92%; the granularity of the aluminum powder is 0.2mm, and the aluminum content is 97%.
2) The weight percentages are as follows: 50% of calcium oxide, 10% of calcium hydroxide, 15% of calcium carbonate, 5% of magnesium oxide, 10% of aluminum oxide and 10% of metallic aluminum are mixed, water accounting for 2% of the total weight of the raw materials is sprayed, and then the raw materials are mixed and ground in a mixing mill to obtain a raw material mixture.
3) The raw material mixture is placed in a high-pressure granulator and pressed into green pellets by adopting a dry method.
4) And (3) putting the green pellets into a drying kiln, drying at 150 ℃ for 4.5 hours, and cooling to room temperature to obtain the LF furnace rapid slag forming composite spheres.
The diameter of the LF furnace rapid slag forming composite sphere prepared in the embodiment is 20mm, the melting point is 1200 ℃, the alkalinity is 7, and the compressive strength is 35MPa.
The use process of the LF furnace rapid slag forming composite sphere is as follows:
mixing the LF furnace rapid slag forming composite sphere with lime granules, and adding the mixture into molten steel meeting the use conditions in the tapping process of a converter, wherein the tapping parameters of the converter are as follows: molten steel temperature 1670 ℃, molten steel oxygen content [ O ] =0.04%.
The granularity of the lime granules is 10mm, and the calcium oxide content is 92%; the addition amount of the LF furnace rapid slag forming composite sphere is 10kg/t steel, and the mixing ratio of the LF furnace rapid slag forming composite sphere and lime granules is 2:1.
When the adding time of the quick slag forming composite sphere of the LF furnace is 20% of the tapping amount of the converter, the quick slag forming composite sphere is added through an alloy chute at one time, and the adding position is near the tapping flow.
In the tapping process, the steel ladle is subjected to strong bottom blowing stirring, the flow rate of argon is 300Nl/min, and the tapping is started to the tapping end. After tapping, stirring was performed for 2 minutes with weak argon blowing, and the flow rate of argon was 25Nl/min.
In this example, the test heat was 3 heats, the LF treatment time was on average 36.31min, and the heating rate was on average 7.16 ℃/min.
[ example 3 ]
In the embodiment, a 260tLF refining furnace is adopted in a certain steel mill, and an LF furnace rapid slag forming test is carried out by using an LF furnace rapid slag forming composite sphere, wherein the test steel grade is QB steel grade.
The preparation process of the LF furnace rapid slag forming composite sphere comprises the following steps:
1) Raw material preparation: lime powder with granularity of 4mm and calcium oxide content of 94%; the granularity of the calcium hydroxide powder is 1mm, and the content of calcium hydroxide is 97%; the granularity of the calcium carbonate powder is 0.15mm, and the content of calcium carbonate is 89%; the granularity of the magnesia powder is 1mm, and the magnesia content is 94%; alumina powder particle size of 0.5mm and alumina content of 94%; the granularity of the aluminum powder is 0.5mm, and the aluminum content is 98%.
2) The weight percentages are as follows: 60% of calcium oxide, 5% of calcium hydroxide, 15% of calcium carbonate, 5% of magnesium oxide, 5% of aluminum oxide and 10% of metallic aluminum are mixed, water accounting for 3% of the total weight of the raw materials is sprayed, and then the raw materials are mixed and ground in a mixing mill to obtain a raw material mixture.
3) The raw material mixture is placed in a high-pressure granulator and pressed into green pellets by adopting a dry method.
4) And (3) putting the green pellets into a drying kiln, drying at 200 ℃ for 3 hours, and cooling to room temperature to obtain the LF furnace rapid slag forming composite spheres.
The diameter of the LF furnace rapid slag forming composite sphere prepared in the embodiment is 30mm, the melting point is 1300 ℃, the alkalinity is 8, and the compressive strength is 50MPa.
The use process of the LF furnace rapid slag forming composite sphere is as follows:
mixing the LF furnace rapid slag forming composite sphere with lime granules, and adding the mixture into molten steel meeting the use conditions in the tapping process of a converter, wherein the tapping parameters of the converter are as follows: the temperature of molten steel is 1690 ℃, and the oxygen content of molten steel [ O ] =0.035%.
The granularity of the lime granules is 10mm, and the calcium oxide content is 94%; the addition amount of the LF furnace rapid slag forming composite sphere is 15kg/t steel, and the mixing ratio of the LF furnace rapid slag forming composite sphere and lime granules is 3:1.
When the adding time of the quick slag forming composite sphere of the LF furnace is 30% of the tapping amount of the converter, the quick slag forming composite sphere is added through an alloy chute at one time, and the adding position is near the tapping flow.
In the tapping process, the steel ladle is subjected to strong bottom blowing stirring, the flow rate of argon is 500Nl/min, and the tapping is started to the tapping end. After tapping, stirring was performed for 3 minutes with weak argon blowing, and the flow rate of argon was 40Nl/min.
In this example, the test heat was 3 heats, the LF treatment time was on average 35.81min, and the heating rate was on average 7.91 ℃/min.
[ comparative example ]
In the comparative example, 260tLF refining furnace in a certain steel mill is produced by adopting a conventional process, the steel grade is QB steel grade, and tapping parameters are as follows: the temperature of molten steel is more than or equal to 1650 ℃, and the oxygen content [ O ] of molten steel is less than or equal to 0.045%.
The statistical heat is 10 furnaces, the LF treatment time is 42.33min on average, and the heating rate is 4.04 ℃/min on average.
Conclusion: compared with the conventional LF refining process, the LF rapid slag formation composite sphere is added in the converter tapping process, the LF metallurgical cycle is obviously shortened, the LF heating rate is increased, the smelting cycle is reduced from the average value of 42.33min to 35.81-37.12 min, the heating rate is increased from the average value of 4.04 ℃/min to 6.42-7.91 ℃/min, namely the treatment cycle is shortened by more than 5min on average, and the heating rate is increased by more than 2 ℃/min on average.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. The preparation method of the quick slag forming composite sphere of the LF furnace is characterized by comprising the following components in percentage by weight: 40-60% of calcium oxide, 5-15% of calcium hydroxide, 15-25% of calcium carbonate, 5-10% of magnesium oxide, 5-10% of aluminum oxide and 10-20% of metal aluminum; the diameter of the rapid slag forming composite sphere is 10-30 mm; the melting point is 1100-1300 ℃, the alkalinity is more than or equal to 6, and the compressive strength is 20-50 MPa;
the preparation method of the rapid slag formation composite sphere comprises the following steps:
1) Preparing raw materials:
lime powder with granularity of 1-4 mm, and calcium oxide with weight percentage content of more than or equal to 92%;
calcium hydroxide powder with the granularity of 0.1-1 mm, wherein the weight percentage content of calcium hydroxide is more than or equal to 95%;
calcium carbonate powder with the granularity of 0.1-0.2 mm, wherein the weight percentage content of the calcium carbonate is more than or equal to 85%;
magnesium oxide powder with granularity of 1-5 mm, wherein the weight percentage content of magnesium oxide is more than or equal to 90%;
alumina powder with granularity of 0.1-0.5 mm, and alumina content of more than or equal to 90 wt%;
metal aluminum powder with granularity of 0.1-0.5 mm, wherein the weight percentage content of aluminum is more than or equal to 96%;
2) Mixing the raw materials according to the proportion of the components, spraying water accounting for 1% -3% of the total weight of the raw materials, and carrying out mixing grinding in a mixing mill to obtain a raw material mixture;
3) Pressing the raw material mixture into green pellets by adopting a dry method;
4) And (3) drying the green pellets at 100-200 ℃ for 3-6 hours, and cooling to room temperature to obtain the rapid slag forming composite spheres.
2. The application method of the LF furnace rapid slag forming composite sphere prepared by the method of claim 1 is characterized in that the rapid slag forming composite sphere is mixed with lime granules and added into molten steel in the tapping process of a converter to realize LF refining rapid slag forming; the addition amount of the rapid slag forming composite sphere is 5-15 kg/t steel, and the mixing weight ratio of the rapid slag forming composite sphere to the lime granules is 1-3:1; when the adding time of the rapid slag forming composite sphere is that the tapping amount of the LF furnace reaches 10% -30%, the rapid slag forming composite sphere is added near the tapping flow at one time.
3. The application method of the LF furnace rapid slag forming composite sphere according to claim 2, wherein the granularity of the lime granules is 5-15 mm, and the calcium oxide content is more than or equal to 90%.
4. The application method of the rapid slag forming composite sphere of the LF furnace according to claim 2, wherein in the tapping process of the LF furnace, strong bottom blowing stirring is carried out on a molten steel tank, the argon flow during the strong bottom blowing stirring is 100-500 Nl/min, and the strong bottom blowing stirring is carried out from the beginning of tapping to the end of tapping; after tapping, stirring for 1-3 min with weak argon blowing, wherein the argon flow during stirring is 10-40 Nl/min.
5. The method for using the LF furnace rapid slag formation composite sphere according to claim 2, wherein the temperature of molten steel during converter tapping is more than or equal to 1650 ℃, and the oxygen content [ O ] of the molten steel is less than or equal to 0.05%.
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| JP2004176094A (en) * | 2002-11-26 | 2004-06-24 | Osaka Koukai Kk | Lime-base flux |
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| CN111270046A (en) * | 2020-03-18 | 2020-06-12 | 凌陈皓玥 | Novel high-efficiency composite refining agent for molten steel |
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| CN114737022A (en) * | 2022-03-15 | 2022-07-12 | 西峡县耀辉冶金材料有限公司 | Environment-friendly smokeless molten steel refining agent and preparation method thereof |
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| JP2004176094A (en) * | 2002-11-26 | 2004-06-24 | Osaka Koukai Kk | Lime-base flux |
| CN102108432A (en) * | 2009-12-23 | 2011-06-29 | 上海梅山钢铁股份有限公司 | Submerged arc slag of refining furnace |
| CN102260770A (en) * | 2010-05-26 | 2011-11-30 | 上海梅山钢铁股份有限公司 | Slag material for refinery furnace |
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