CN114672616B - Molten scrap steel molten iron modifier and preparation method and application thereof - Google Patents
Molten scrap steel molten iron modifier and preparation method and application thereof Download PDFInfo
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- CN114672616B CN114672616B CN202210313316.0A CN202210313316A CN114672616B CN 114672616 B CN114672616 B CN 114672616B CN 202210313316 A CN202210313316 A CN 202210313316A CN 114672616 B CN114672616 B CN 114672616B
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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
- C21C7/076—Use of slags or fluxes as treating agents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- 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 discloses a molten scrap iron modifier and a preparation method and application thereof, wherein the modifier comprises the following raw materials in percentage by weight: low and low55-75% of cost Si-Al-Ca-C alloy, 10-20% of sintered calcium aluminate, 5-15% of industrial sodium carbonate and 5-15% of fluorite. By introducing low-cost Si-Al-Ca-C alloy and high-content Si, al, ca, C alloy elements into the modifier, the supplement of the alloy elements in the molten iron and the deep deoxidation of the molten iron are realized, meanwhile, the reduction modification of top slag of the molten iron is finished, the thermodynamic condition of the desulfurization reaction of the molten iron is improved, the efficient desulfurization of the molten iron of Ca alloy elements is realized, mgS in the desulfurization slag is converted into CaS, and the stability of sulfide in the desulfurization slag is improved; by using 12 CaO.7Al as main component 2 O 3 The introduction of sintered calcium aluminate and industrial-grade sodium carbonate improves the sulfur capacity and the sulfur distribution coefficient of the desulfurization slag, and inhibits the reversion of the desulfurization slag; through the addition of industrial-grade sodium carbonate and fluorite, the melting point of the desulfurization slag is reduced, the slag-metal interface reaction is promoted, the desulfurization efficiency is improved, and the resulfurization of the residue is inhibited.
Description
Technical Field
The invention relates to the technical field of ferroalloy, in particular to a molten scrap iron modifier, a preparation method and application thereof.
Background
For steel combined enterprises, how to reduce the converter molten iron ratio and improve the scrap steel ratio becomes an urgent need for low-carbon green development of the enterprises. The single-process scrap steel adding amount of the converter is limited by the volume of a scrap steel tank and the heat balance and production rhythm of the converter, so that the single-process scrap steel adding amount of the converter is limited, and the effective improvement of the smelting scrap steel ratio of the converter is hindered. However, the temperature of molten iron is lowered greatly, the molten iron temperature is lowered, the carburization and melting speed of the scrap steel is low, the quantity and the specification of molten iron scrap steel are restricted, the scrap steel is baked and preheated, the temperature of the scrap steel when receiving iron is improved, the time for heating and carburization and melting the scrap steel and molten iron is shortened, the phenomenon that the scrap steel with a slightly large specification is not melted thoroughly in actual production often happens, and the normal production of desulfurization pretreatment of the molten iron is seriously influenced, so that the control of the broken and added quantity of the scrap steel with a small specification becomes a main mode of adding the scrap steel into the molten iron. However, in actual production, the problems of viscous slag on molten iron top, difficult slag skimming during molten iron desulfurization, serious influence on the quality of molten iron entering a furnace, the sulfur return amount of tapping of a converter, the implementation of a variety steel smelting production plan, the whole-flow production organization and the like caused by adding scrap steel into an empty ladle of a molten iron tank or a torpedo tank into a scrap steel crushing material are found, so that how to overcome the series of problems caused by adding scrap steel into molten iron becomes one of key technologies for breaking through when large scrap steel of a converter is more urgently needed than smelting.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a molten scrap iron modifier and a preparation method and application thereof, wherein the molten scrap iron modifier has the advantages of low content of harmful elements, low cost, simple preparation, convenient use, improvement of the content of easily oxidized alloy of molten scrap iron, reduction of top slag oxidizing property, increase of top slag alkalinity, improvement of thermodynamic conditions of molten scrap iron desulfurization reaction and the like, and achieves the comprehensive purposes of improving the efficiency and deep desulfurization stability of molten scrap iron desulfurization reaction, stabilizing the quality of molten iron fed into a furnace, improving the smelting operation of a converter, improving the quality of molten steel and the like.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a molten scrap iron modifier, which comprises the following raw materials in percentage by weight: 55-75% of low-cost silicon aluminum calcium carbon alloy, 10-20% of sintered calcium aluminate, 5-15% of industrial sodium carbonate and 5-15% of fluorite.
Preferably, the low-cost silicon aluminum calcium carbon alloy mainly comprises Si, al, ca, C alloy elements and metal Fe, and the main impurity elements are P and S.
It is further preferred that the Si, al, ca, C alloy elements are present in the following weight percent ranges: 35-45% of Si, 5-10% of Al, 9-19% of Ca and 4-12% of C; the weight percentage content range of the metal Fe is 1.5-2.5%; the weight percentage content range of the impurity element P, S is less than or equal to 0.05 percent and less than or equal to 0.1 percent.
Preferably, the main component 12 CaO.7Al2O3 content of the sintered calcium aluminate is more than or equal to 85 percent, and the main component CaF2 content of the fluorite is more than or equal to 85 percent.
In a second aspect, the present invention provides a method for preparing a molten scrap iron modifier, comprising the steps of:
1) Preparing materials according to the raw material composition of the molten scrap steel and molten iron modifier;
2) Crushing the low-cost silicon-aluminum-calcium-carbon alloy, and screening to obtain natural graded particles with the particle size less than or equal to 5 mm; ball milling is carried out on sintered calcium aluminate and fluorite respectively, and powder with the particle size smaller than 150 meshes is obtained after screening; grinding industrial sodium carbonate, and screening to obtain powder with the particle size smaller than 100 meshes;
3) Weighing low-cost silicon-aluminum-calcium-carbon alloy, sintered calcium aluminate, industrial sodium carbonate and fluorite according to weight percentage, adding into a vertical stirrer, stirring and mixing for 10-15 minutes to obtain a molten scrap steel molten iron modifier mixture;
4) And adding the obtained roller-mill mixture into a high-strength twin-roller ball mill, dry-pressing into balls with the diameter of 25-50 mm, and packaging and warehousing in a sealed packaging mode to obtain the finished product of the molten waste steel and molten iron modifier.
In a third aspect, the present invention provides a method of using a molten scrap iron modifier, comprising the steps of:
a. according to the production requirements, confirming the scrap steel adding amount of single-tank molten scrap steel and molten iron;
b. performing slag skimming on molten scrap steel and molten iron top slag;
c. according to the addition amount of the scrap steel of the single-tank molten scrap steel molten iron and the target sulfur content of molten iron desulfurization, the addition amount of the molten scrap steel molten iron modifier is 4-10 Kg according to the addition amount of single ton of scrap steel;
d. according to the calculated adding amount of the modifier of the molten iron of the single-tank molten scrap steel, adding the calculated amount of the modifier to the liquid level of a molten iron tank which is transferred into a molten iron desulfurization station after slag skimming, carrying out molten iron blowing desulfurization or KR stirring desulfurization operation according to a molten iron desulfurization process without scrap steel, and carrying out molten iron slag skimming and temperature measurement sampling analysis after desulfurization is finished.
Preferably, in the step b, the proportion of the exposed surface of the molten iron after slag skimming is more than or equal to 50 percent.
Preferably, in the step c, the method for adding the molten scrap iron modifier comprises the following steps: the target sulfur is more than or equal to 100ppm, the adding amount of the single ton of scrap steel modifier is 4-6 Kg, when the target sulfur is less than or equal to 10ppm and less than or equal to 100ppm, the adding amount of the single ton of scrap steel modifier is 6-8 Kg, and when the target sulfur is less than or equal to 10ppm, the adding amount of the single ton of scrap steel modifier is 9-10 Kg.
In practice and testing, we found that: according to the on-site sampling analysis and theoretical research of a system, the surface oxidation of the crushed steel scraps with small specification is serious, the entrainment amount of earth impurities is large, and according to the calculation that the iron oxide content and the entrainment amount of earth impurities in the scrap steel are 3 percent, the addition amount of molten iron scraps is 3 percent and the slag carrying amount of a blast furnace is 0.6 percent, the iron oxide content, the earth impurities carrying amount of the scrap steel scraps and the slag carrying amount of molten iron are 0.9Kg, 0.9Kg and 6Kg respectively, the total slag amount of the molten iron is increased by 1.8Kg, the iron oxide content in the slag is increased by more than 11 percent, meanwhile, the conventional earth impurities are mainly acidic impurities with high silicon dioxide content, so that the alkalinity in the slag entrained by the scrap steel is greatly reduced, high-oxidation viscous acid molten iron slag is formed, the slag skimming plate is serious in the slag skimming process, the slag skimming efficiency is low, the molten iron residue is large, the molten iron slag pre-treatment thermodynamic conditions are seriously deteriorated, molten iron hit is caused, the molten iron production period is long, the molten iron is low, the desulphurized slag is low, and the quality of the desulphurized slag is also seriously influenced by a high-oxidation slag production line, and the quality of a high-aging slag is also caused by a high-quality slag pot. In addition, as the molten iron in the process of receiving the iron of the blast furnace is in scouring contact with the surface of the scrap steel, the liquid level semi-immersed scrap steel is in interfacial contact with the molten iron in the process of transferring and placing the molten iron, and the scrap steel is in mixed contact with the molten iron in the process of pouring, oxidation reaction between iron scale on the surface of the scrap steel and easily oxidized alloy in the molten iron is caused, so that the content of easily oxidized alloy elements of the molten iron is lower, particularly the oxidation of metallic silicon, not only is the chemical heat of the molten iron entering the blast furnace reduced, but also the top slag alkalinity of the molten iron and the reactivity of a molten iron desulfurizing agent are reduced, the thermodynamic condition of the molten iron desulfurizing reaction is deteriorated, and the desulfurizing difficulty of molten steel of the molten scrap steel is increased.
In summary, under the existing technological conditions of adding scrap steel into empty ladle or torpedo ladle, the method achieves the expected purposes of preheating scrap steel by waste heat of empty ladle after pouring of the ladle or torpedo ladle, improving the interface efficiency of the iron and reducing the ratio of molten scrap steel in converter smelting, but brings iron oxide into the ladle due to the existence of iron scale on the surface of the scrap steel; although the coal-oxygen lance of the scrap steel in the empty tank is preheated, the temperature of the scrap steel is increased, the temperature drop of molten iron caused by heat absorption of the scrap steel is reduced, and carburizing and melting of the scrap steel are promoted, the coal-oxygen lance of the scrap steel is preheated to further oxidize the scrap steel, and the iron oxide amount of the scrap steel strip is increased. Because the broken scrap steel acid sundries are carried in and the scrap steel iron scales oxidize easily oxidized alloy elements in the molten iron, the reactivity of the molten iron top slag alkalinity and the molten iron desulfurizing agent is reduced, the molten iron desulfurization is difficult, and the popularization and the application of the molten iron and scrap steel adding process technology are restricted. Although the solution to the problem is urgent, the technology of the empty ladle and scrap steel process of the hot metal ladle or torpedo ladle is just applied initially, and no research on the system is developed at present, so that an effective technical solution is formed.
Compared with the prior art, the invention has the following advantages:
based on the main reasons found by research, theoretical research is carried out, an online alloy regulation and control and top slag reduction alkalization modification technical approach of molten scrap steel and molten iron is provided, and the technology of the invention is formed through modifier formula design, pilot test, industrial test and the like, namely: a molten scrap iron modifier and a preparation method and application thereof. The introduction of the low-cost Si-Al-Ca-C alloy and the high content of Si, al, ca, C alloy elements in the molten steel and iron modifier not only realize the supplement of the alloy elements in the molten steel and the deep deoxidation of the molten steel, but also finish the reduction modification of top slag of the molten steel and improve the thermodynamic condition of molten steel desulfurization reaction, and in addition, realize the efficient desulfurization of the molten steel of Ca alloy elements, convert MgS in the desulfurization slag into CaS and improve the stability of sulfides in the desulfurization slag; by using 12 CaO.7Al as main component 2 O 3 The introduction of sintered calcium aluminate and industrial-grade sodium carbonate improves the sulfur capacity and the sulfur distribution coefficient of the desulfurization slag, and inhibits the reversion of the desulfurization slag; through the addition of industrial-grade sodium carbonate and fluorite, the melting point of the desulfurization slag is reduced, the slag-metal interface reaction is promoted, the desulfurization efficiency is improved, and the resulfurization of the residue is inhibited. The preparation method and the application technology of the molten scrap molten iron modifier ensure the preparation quality and the application effect of the molten scrap molten iron modifier, realize the online modification of molten scrap molten iron in industrial experiments, obtain the expected effects of reasonable control of molten scrap molten iron alloy components, high-efficiency and stable deep desulfurization of molten iron and smooth slag skimming execution of molten iron, and achieve the comprehensive aims of stabilizing the quality of molten iron in a furnace and reducing the sulfur return amount of tapping.
Detailed Description
The present invention will be described in further detail with reference to the following specific embodiments. The test methods or test methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials, unless otherwise specified, are obtained from conventional commercial sources or prepared in conventional manner. Of course, the protective scope of the invention is not limited to the examples described below.
Example 1:
the embodiment provides a molten scrap iron modifier which mainly comprises low-cost silicon-aluminum-calcium-carbon alloy, sintered calcium aluminate, industrial sodium carbonate and fluorite, wherein the components comprise the following components in percentage by weight: 65% of low-cost silicon-aluminum-calcium-carbon alloy, 15% of sintered calcium aluminate, 10% of industrial sodium carbonate and 10% of fluorite. The low-cost silicon aluminum calcium carbon alloy mainly comprises Si, al, ca, C alloy elements and metal Fe, wherein the main impurity elements are P and S, and the weight percentage content range of the Si, al, ca, C alloy elements is as follows: 35-45% of Si, 5-10% of Al, 9-19% of Ca, and 4-12% of C; the weight percentage content range of the metal Fe is as follows: 1.5 to 2.5 percent; the impurity element P, S comprises the following components in percentage by weight: p is less than or equal to 0.05 percent, S is less than or equal to 0.1 percent.
The main component of the sintered calcium aluminate is 12CaO.7Al 2 O 3 ，12CaO·7Al 2 O 3 The content is more than or equal to 85 percent; the fluorite CaF 2 The content is more than or equal to 85 percent. The sintered calcium aluminate, the industrial sodium carbonate and the fluorite are all commercial products.
The embodiment provides a preparation method of a molten scrap iron modifier, which comprises the following specific steps:
(1) According to the raw material composition of the molten scrap steel molten iron modifier, raw materials such as low-cost silicon-aluminum-calcium-carbon alloy, sintered calcium aluminate, industrial sodium carbonate, fluorite and the like are prepared;
(2) Crushing the low-cost silicon-aluminum-calcium-carbon alloy, and selecting a 5mm mesh screen to screen and discharge to obtain natural graded granules with the particle size less than or equal to 5 mm; ball milling is carried out on sintered calcium aluminate and fluorite respectively, 150-mesh screening mesh is selected for screening and discharging, and powder with the particle size smaller than 150 meshes is obtained; and rolling the industrial grade sodium carbonate, selecting a 100-mesh screen for sieving and discharging to obtain powder with the particle size smaller than 100 meshes.
(3) According to the mass percentage of the low-cost silicon aluminum calcium carbon alloy, the sintered calcium aluminate, the industrial grade sodium carbonate and the fluorite in the molten scrap steel molten iron modifier, the components are weighed and added into a vertical mixer to be mixed for 10-15 minutes, so as to obtain the molten scrap steel molten iron modifier mixture.
(4) And adding the obtained roller-mill mixture into a high-strength twin-roller ball mill, dry-pressing into balls with the diameter of 25-50 mm, and packaging and warehousing in a sealed packaging mode to obtain the finished product of the molten waste steel and molten iron modifier.
The embodiment provides an application method of a molten scrap iron modifier, which comprises the following specific steps:
(1) According to the production requirements, confirming the scrap steel adding amount of single-tank molten scrap steel and molten iron;
(2) Performing slag skimming on molten scrap steel and molten iron top slag; the proportion of the exposed surface of the molten iron after slag skimming is required to be more than or equal to 50 percent;
(3) According to the addition amount of single-tank molten scrap steel and molten iron desulphurization target sulfur content, adding the molten scrap steel and molten iron modifier according to the addition amount of single ton of scrap steel, wherein the target sulfur is more than or equal to 100ppm, and the addition amount of single ton of scrap steel modifier is 4-6 Kg;
(4) According to the calculated adding amount of the modifier of the molten steel of the single-tank molten scrap steel, adding the calculated amount of the modifier to the liquid level of a hot metal tank which is transferred to a hot metal desulfurization station after slag skimming, carrying out hot metal injection desulfurization or KR stirring desulfurization operation according to a hot metal desulfurization process without adding scrap steel, and carrying out slag skimming and temperature measurement sampling analysis after desulfurization is finished, thereby realizing the comprehensive aims of online regulation and control of molten steel components of the molten scrap steel, online modification of top slag and high-efficiency desulfurization, and stabilizing the quality of molten iron fed into a converter and reducing the molten iron return of the converter.
In the step 3 of the application method, for the pot time with the target sulfur of 100ppm, the adding amount of the single ton of scrap steel modifier is 6Kg, and the final sulfur content after desulfurization is less than or equal to 100ppm; for the tank times with the target sulfur of 150ppm, adding 4Kg of the modifier according to the single ton of scrap steel, wherein the final sulfur content after desulfurization is less than or equal to 150ppm; the desulfurization target requirement is met.
Example 2: a molten scrap iron modifier, which differs from example 1 in that: the low-cost silicon aluminum calcium carbon alloy, sintered calcium aluminate, industrial sodium carbonate and fluorite are different in weight percentage, and the specific components are as follows: 55% of low-cost silicon-aluminum-calcium-carbon alloy, 20% of sintered calcium aluminate, 15% of industrial-grade sodium carbonate and 10% of fluorite.
In the step 3 of the application method, when the target sulfur is less than or equal to 10ppm and less than 100ppm, the adding amount of the modifier for single ton of scrap steel is 6-8 Kg; the other steps are the same as in example 1.
In the step 3 of the application method, for the tank times with the target sulfur less than 100ppm, the adding amount of the single ton scrap steel modifier is 6.2Kg, and the final sulfur content after desulfurization is less than 100ppm; for the tank times with the target sulfur of 10ppm, 8Kg of modifier is added according to the single ton of scrap steel, and the final sulfur content after desulfurization is less than or equal to 10ppm; the desulfurization target requirement is met.
Example 3: a molten scrap iron modifier, which differs from example 1 in that: the low-cost silicon aluminum calcium carbon alloy, sintered calcium aluminate, industrial sodium carbonate and fluorite are different in weight percentage, and the specific components are as follows: 75% of low-cost silicon-aluminum-calcium-carbon alloy, 15% of sintered calcium aluminate, 5% of industrial-grade sodium carbonate and 5% of fluorite.
In the step 3 of the application method, when the target sulfur is less than 10ppm, the adding amount of the modifier for single ton of scrap steel is 9-10 Kg; the other steps are the same as in example 1.
In the step 3 of the application method, the sulfur content of the end point after desulfurization is less than 10ppm according to the desulfurization tank with the addition amount of 9Kg of single ton of waste steel modifier, the sulfur content of the end point after desulfurization is less than or equal to 5ppm according to the addition amount of 10Kg of single ton of waste steel modifier, and the sulfur content of the end point after desulfurization is 0ppm (less than the metering precision of detection equipment, namely trace sulfur) after partial desulfurization, thereby meeting the target requirement of desulfurization.
The molten scrap iron modifier is adopted to carry out on-line modification industrial tests of molten scrap iron under the conditions of different scrap iron addition amounts and molten iron target sulfur, and 4-10 Kg of the molten scrap iron modifier is added according to the single ton scrap iron addition amount, wherein the target sulfur is more than or equal to 100ppm, the single ton scrap iron modifier addition amount is 4-6 Kg, when 10ppm is less than or equal to 100ppm, the single ton scrap iron modifier addition amount is 6-8 Kg, and when the target sulfur is less than 10ppm, the single ton scrap iron modifier addition amount is 9-10 Kg, so that the desulfurization slag skimming and converter smelting industrial tests of tens of molten scrap iron with different scrap iron addition amounts and target sulfur requirements are completed, and the test effect of stably controlling the quality of molten iron and converter tapping sulfur content according to requirements is obtained. Meets the smelting requirement of high-quality, high-efficiency and low-cost of converter large scrap steel with multiple steps of scrap steel adding.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (6)
1. The molten scrap iron modifier is characterized by comprising the following raw materials in percentage by weight: 55-75% of low-cost silicon aluminum calcium carbon alloy, 10-20% of sintered calcium aluminate, 5-15% of industrial sodium carbonate and 5-15% of fluorite;
the low-cost silicon-aluminum-calcium-carbon alloy mainly comprises Si, al, ca, C alloy elements and metal Fe, and the main impurity elements are P and S; the weight percentage content range of Si, al, ca, C alloy elements is as follows: 35-45% of Si, 5-10% of Al, 9-19% of Ca and 4-12% of C; the weight percentage content range of the metal Fe is 1.5-2.5%; the weight percentage content range of the impurity element P, S is less than or equal to 0.05 percent and less than or equal to 0.1 percent.
2. The molten scrap iron modifier according to claim 1, wherein the main component of the sintered calcium aluminate: 12CaO 7Al 2 O 3 The content is more than or equal to 85 percent, and the main components of the fluorite are as follows: caF (CaF) 2 The content is more than or equal to 85 percent.
3. A method of preparing the molten scrap iron modifier of any one of claims 1-2, comprising the steps of:
1) Preparing materials according to the raw material composition of the molten scrap steel and molten iron modifier;
2) Crushing the low-cost silicon-aluminum-calcium-carbon alloy, and screening to obtain natural graded particles with the particle size less than or equal to 5 mm; ball milling is carried out on sintered calcium aluminate and fluorite respectively, and powder with the particle size smaller than 150 meshes is obtained after screening; grinding industrial sodium carbonate, and screening to obtain powder with the particle size smaller than 100 meshes;
3) Weighing low-cost silicon aluminum calcium carbon alloy, sintered calcium aluminate, industrial sodium carbonate and fluorite according to weight percentage, adding the low-cost silicon aluminum calcium carbon alloy, the sintered calcium aluminate, the industrial sodium carbonate and the fluorite into a vertical stirrer, stirring and mixing for 10-15 minutes to obtain a molten scrap steel molten iron modifier mixture;
4) And adding the obtained roller-mill mixture into a high-strength twin-roller ball mill, dry-pressing into balls with the diameter of 25-50 mm, and packaging and warehousing in a sealed packaging mode to obtain a finished product of the molten steel scrap molten iron modifier.
4. A method of using the molten scrap iron modifier of any one of claims 1-2, comprising the steps of:
a. according to the production requirements, confirming the scrap steel adding amount of single-tank molten scrap steel and molten iron;
b. performing slag skimming on molten scrap steel and molten iron top slag;
c. according to the addition amount of the scrap steel of the single-tank molten scrap steel molten iron and the target sulfur content of molten iron desulfurization, the addition amount of the molten scrap steel molten iron modifier ranges from 4Kg to 10Kg according to the addition amount of single ton of scrap steel;
d. according to the calculated adding amount of the modifier of the molten iron of the single-tank molten scrap steel, adding the calculated amount of the modifier to the liquid level of a molten iron tank which is transferred into a molten iron desulfurization station after slag skimming, carrying out molten iron blowing desulfurization or KR stirring desulfurization operation according to a molten iron desulfurization process without scrap steel, and carrying out molten iron slag skimming and temperature measurement sampling analysis after desulfurization is finished.
5. The method for using molten scrap iron and molten iron modifier according to claim 4, wherein in the step b, the proportion of the exposed surface of molten iron after slag skimming is more than or equal to 50%.
6. The method for using molten scrap iron modifier according to claim 4, wherein in step c, the amount of molten scrap iron modifier added is calculated by: the target sulfur is more than or equal to 100ppm, and the addition amount of the modifier for single ton of scrap steel is 4-6 Kg; when the target sulfur is less than or equal to 10ppm and less than 100ppm, the adding amount of the modifier for single ton of scrap steel is 6-8 Kg; when the target sulfur is less than 10ppm, the adding amount of the modifier for single ton of scrap steel is 9-10 Kg.
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| CN1062019C (en) * | 1998-02-24 | 2001-02-14 | 宝山钢铁(集团)公司 | Desulfurizing slag modifier |
| JP2000212633A (en) * | 1999-01-28 | 2000-08-02 | Kawasaki Steel Corp | Desulfurization of molten steel in ladle refining |
| CN101665858A (en) * | 2009-09-01 | 2010-03-10 | 孙福云 | Steel ladle slag modifier for external refining |
| CN101812568B (en) * | 2010-04-28 | 2013-06-12 | 河南省西保冶材集团有限公司 | Kalzium metal for deoxidization during steel making |
| 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 |
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