CN115418431A - Operation method for external pretreatment of high-sulfur steel scrap - Google Patents
Operation method for external pretreatment of high-sulfur steel scrap Download PDFInfo
- Publication number
- CN115418431A CN115418431A CN202210925369.8A CN202210925369A CN115418431A CN 115418431 A CN115418431 A CN 115418431A CN 202210925369 A CN202210925369 A CN 202210925369A CN 115418431 A CN115418431 A CN 115418431A
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- Prior art keywords
- steel
- temperature
- molten iron
- steel scrap
- scrap
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 81
- 239000010959 steel Substances 0.000 title claims abstract description 81
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 42
- 239000011593 sulfur Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 92
- 229910052742 iron Inorganic materials 0.000 claims abstract description 46
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 17
- 230000023556 desulfurization Effects 0.000 claims abstract description 17
- 238000009628 steelmaking Methods 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 7
- 238000010079 rubber tapping Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 238000004364 calculation method Methods 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses an operation method for external pretreatment of high-sulfur steel scrap, which is characterized in that the high-sulfur steel scrap is conveyed to a charging position bin of a molten iron torpedo tank, the charging amount of the high-sulfur steel scrap meeting the steel-making temperature requirement is calculated according to the tapping temperature of the molten iron of a blast furnace, the steel scrap is added into the torpedo tank by using a rotary chute during charging of the blast furnace, the melting of the steel scrap in the torpedo tank is promoted by using the stirring effect of the molten iron, the components and the temperature of the molten iron of each furnace are input into a heat balance calculation model, the excessive heat in the torpedo tank is balanced by adding the high-sulfur steel scrap into the bin, the temperature range of the charged high-sulfur steel scrap is only 10-15 ℃, the charging amount of the steel is controlled to 10-18 tons, the temperature of steel-making iron and steel can be effectively ensured to be 1300-1350 ℃, the temperature loss in the desulfurization process is 20-30 ℃ after the steel-making iron and the steel is ensured to be more than 1300 ℃, and the requirement that the initial temperature of the molten iron desulfurization is more than or equal to 1250 ℃ is met.
Description
Technical Field
The invention relates to an operation method for external pretreatment of high-sulfur steel scraps, belonging to the field of ferrous metallurgy.
Background
At present, the price of steel industry scrap is high, the price of heavy qualified materials is far beyond the price of molten iron, if the high-quality high-price scrap is continuously used, the cost is inevitably high, if the low-grade low-price scrap is used, the manufacturing cost of per ton steel can be effectively reduced, and the condition that the material type, the size and the content of harmful element sulfur elements exceed the standard exists in the low-quality scrap. The problems of material type and size can be solved by increasing the charging times of the scrap steel; but part of the low-quality steel scrap belongs to high-sulfur steel scrap, which brings great difficulty to the process of smelting variety steel by a converter. Sulphur is a harmful element in steel, and one of the tasks of converter smelting is desulphurization, but the desulphurization rate is only between 30 and 35 percent. At present, the severe situation of the steel market requires that steel needs to be greatly developed in product quality and variety, and particularly steel grades which are urgently needed, are in short supply in the market and have high additional value in the production country need to be produced. The steel grades have higher requirements on the sulfur content in the steel, and some steel grades are pure steel. The content of high-sulfur steel scrap used by the converter at the present stage is 1.2-1.5%, the cost of the high-sulfur steel scrap with higher price is reduced by 500 yuan/t, and the cost is reduced by 2.52 yuan/t when 1 ton of high-sulfur steel scrap is added, however, the cost advantage is very considerable, aiming at the traditional operation method for charging the high-sulfur steel scrap:
1. firstly, the desulfurization capacity of the converter is improved by utilizing the influence factors of the desulfurization and gasification of the converter slag in a mode of slagging and adding a desulfurizing agent, but the operation has larger influence on the production of high-quality steel by the converter, so that the conversion rate of the converter is lower, the consumption of iron and steel materials and lime is higher, the smelting period is longer, the furnace protection difficulty is increased, and the production cost of the converter is further influenced.
2. The desulfurization is carried out for a long time in a ladle by external refining. Because argon gas is needed for stirring in the desulfurization process, secondary oxidation, nitrogen absorption and other phenomena are easy to occur on the bare molten steel on the liquid surface of the steel ladle, the quality of various steels is greatly influenced, and the cost of the refining process is increased.
Disclosure of Invention
The invention aims to provide an operation method for external pretreatment of high-sulfur steel scraps, which can meet the control requirement of sulfur element in molten iron required by production.
The main process of the invention is as follows: an operation method for the external pretreatment of high-sulfur steel scrap comprises the steps of conveying the high-sulfur steel scrap to a molten iron torpedo ladle charging position bin, calculating the adding amount of the high-sulfur steel scrap meeting the steel-making temperature requirement according to a molten iron tapping temperature of a blast furnace, adding the steel scrap into the torpedo ladle by using a rotary chute during the charging of the blast furnace, promoting the melting of the steel scrap in the torpedo ladle by using the stirring effect of the molten iron,
the balance calculation model of the molten iron composition and the temperature input heat of each blast furnace adopts a storage bin to add high-sulfur steel scrap to balance the redundant heat in a torpedo tank, and the specific data is as follows:
theoretically calculating the highest tonnage of scrap steel to be 35 tons by calculating the heat generated by reducing 10 ℃ of 1kg of molten iron and the cooling effect of 1kg of scrap steel when the temperature of the molten iron reaches 1520 ℃;
determining the addition of high-sulfur waste steel according to the heat balance in the molten iron torpedo tank: the temperature range of the finally added high-sulfur steel scrap is only 10-15 ℃ by calculating the blast furnace tapping temperature, the iron runner temperature drop and the temperature loss in the transportation process, but the temperature of the steel-making water can be effectively ensured to be 1300-1350 ℃ by considering the unstable online service time of the torpedo ladle and controlling the adding amount of the steel scrap to be 10-18 tons, the temperature loss in the desulfurization process is 20-30 ℃ after the steel-making water is lifted to a desulfurization station, the temperature of the molten iron entering the furnace is ensured to be above 1300 ℃, and the requirement that the initial temperature of the molten iron desulfurization is more than or equal to 1250 ℃ is met.
According to the operation method, the adding amount of the high-sulfur steel scrap is calculated by utilizing heat balance according to the temperature of the molten iron, the calculated high-sulfur steel scrap is added into the molten iron torpedo tank, and the molten iron is lifted to the desulfurization station for desulfurization after the iron adding at the ladle transfer station is completed, so that the consumption of the high-sulfur steel scrap is achieved, the condition that the sulfur element of the metal material entering the furnace meets the technical requirements of the process is ensured, and the purpose of reducing the heat of the molten iron is also achieved.
1. By adopting the operation method, the addition of the high-sulfur steel scrap can be increased, the metal charge of the molten iron and sulfur element in the charge furnace meeting the process requirements can be obtained, the consumption of the steel charge and the slag charge is reduced, the end point control capability of the converter is improved, the generation of impurities in the deoxidation alloying process is reduced, the quality of the variety steel is improved, the requirement of the variety steel on the high-quality steel scrap is reduced, and the cost of the steel scrap is reduced.
2. Not only improves the influence of high-sulfur steel scrap on various economic indexes of the converter, but also provides favorable conditions for the subsequent process so as to improve the quality of variety steel;
3. the operation times of operators are reduced, and the labor intensity of workers can be reduced.
4. The application is wider, and the similar enterprises can implement the technology with complete reference, so the feasibility is high.
Detailed Description
An operation method for the external pretreatment of high-sulfur steel scrap comprises the steps of conveying the high-sulfur steel scrap to a molten iron torpedo ladle charging position bin, calculating the adding amount of the high-sulfur steel scrap meeting the steel-making temperature requirement according to a molten iron tapping temperature of a blast furnace, adding the steel scrap into the torpedo ladle by using a rotary chute during the charging of the blast furnace, promoting the melting of the steel scrap in the torpedo ladle by using the stirring effect of the molten iron,
the balance calculation model of the molten iron composition and the temperature input heat of each blast furnace adopts a storage bin to add high-sulfur steel scrap to balance the redundant heat in a torpedo tank, and the specific data is as follows:
theoretically calculating the highest tonnage of scrap steel to be 35 tons by calculating the heat generated by reducing 10 ℃ of 1kg of molten iron and the cooling effect of 1kg of scrap steel when the temperature of the molten iron reaches 1520 ℃;
determining the addition of the high-sulfur steel scrap according to the heat balance in the molten iron torpedo tank:
the temperature range of the finally added high-sulfur steel scrap is only 10-15 ℃ by calculating the blast furnace tapping temperature, the iron runner temperature drop and the temperature loss in the transportation process, but the temperature of the steel-making water can be effectively ensured to be 1300-1350 ℃ by considering the unstable online service time of the torpedo ladle and controlling the adding amount of the steel scrap to be 10-18 tons, the temperature loss in the desulfurization process is 20-30 ℃ after the steel-making water is lifted to a desulfurization station, the temperature of the molten iron entering the furnace is ensured to be above 1300 ℃, and the requirement that the initial temperature of the molten iron desulfurization is more than or equal to 1250 ℃ is met.
Claims (1)
1. An operation method for the external pretreatment of high-sulfur steel scrap is characterized in that the high-sulfur steel scrap is transported to a molten iron torpedo ladle charging position bin, the adding amount of the high-sulfur steel scrap meeting the steel-making temperature requirement is calculated according to the tapping temperature of the molten iron of a blast furnace, the steel scrap is added into the torpedo ladle by using a rotary chute during the charging of the blast furnace, the melting of the steel scrap in the torpedo ladle is promoted by using the stirring effect of the molten iron,
the method comprises the following steps of inputting the components and the temperature of molten iron into a heat balance calculation model of each blast furnace, adding high-sulfur steel scrap into a stock bin to balance redundant heat in a torpedo ladle, wherein the specific data are as follows:
theoretically calculating the highest tonnage of scrap steel to be 35 tons by calculating the heat generated by reducing 10 ℃ of 1kg of molten iron and the cooling effect of 1kg of scrap steel when the temperature of the molten iron reaches 1520 ℃;
determining the addition of high-sulfur waste steel according to the heat balance in the molten iron torpedo tank: the temperature range of the finally added high-sulfur steel scrap is only 10-15 ℃ by calculating the blast furnace tapping temperature, the iron runner temperature drop and the temperature loss in the transportation process, but the temperature of the steel-making water can be effectively ensured to be 1300-1350 ℃ by considering the unstable online service time of the torpedo ladle and controlling the adding amount of the steel scrap to be 10-18 tons, the temperature loss in the desulfurization process is 20-30 ℃ after the steel-making water is lifted to a desulfurization station, the temperature of the molten iron entering the furnace is ensured to be above 1300 ℃, and the requirement that the initial temperature of the molten iron desulfurization is more than or equal to 1250 ℃ is met.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210925369.8A CN115418431A (en) | 2022-08-03 | 2022-08-03 | Operation method for external pretreatment of high-sulfur steel scrap |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210925369.8A CN115418431A (en) | 2022-08-03 | 2022-08-03 | Operation method for external pretreatment of high-sulfur steel scrap |
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| Publication Number | Publication Date |
|---|---|
| CN115418431A true CN115418431A (en) | 2022-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210925369.8A Pending CN115418431A (en) | 2022-08-03 | 2022-08-03 | Operation method for external pretreatment of high-sulfur steel scrap |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115418431A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101037716A (en) * | 2007-04-26 | 2007-09-19 | 武汉钢铁(集团)公司 | Short-flow super low carbon steel ultra-low sulphur smelting control method |
| CN108676946A (en) * | 2018-06-14 | 2018-10-19 | 邯郸钢铁集团有限责任公司 | A kind of whole process reduces the smelting process of molten steel consumption |
| CN111378806A (en) * | 2018-12-30 | 2020-07-07 | 新疆八一钢铁股份有限公司 | Operation method for digesting high-sulfur waste steel by converter iron ladle |
| CN111549196A (en) * | 2019-02-10 | 2020-08-18 | 新疆八一钢铁股份有限公司 | Steelmaking operation method for replacing coolant with scrap steel broken material |
| CN111607677A (en) * | 2019-02-24 | 2020-09-01 | 新疆八一钢铁股份有限公司 | Operation method for reducing iron loss of molten iron torpedo ladle |
| CN111944940A (en) * | 2019-05-14 | 2020-11-17 | 江苏集萃冶金技术研究院有限公司 | Method for controlling inclusions in IF steel |
| CN113493868A (en) * | 2021-06-22 | 2021-10-12 | 新疆八一钢铁股份有限公司 | High scrap ratio converter smelting method based on molten reduced molten iron |
-
2022
- 2022-08-03 CN CN202210925369.8A patent/CN115418431A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101037716A (en) * | 2007-04-26 | 2007-09-19 | 武汉钢铁(集团)公司 | Short-flow super low carbon steel ultra-low sulphur smelting control method |
| CN108676946A (en) * | 2018-06-14 | 2018-10-19 | 邯郸钢铁集团有限责任公司 | A kind of whole process reduces the smelting process of molten steel consumption |
| CN111378806A (en) * | 2018-12-30 | 2020-07-07 | 新疆八一钢铁股份有限公司 | Operation method for digesting high-sulfur waste steel by converter iron ladle |
| CN111549196A (en) * | 2019-02-10 | 2020-08-18 | 新疆八一钢铁股份有限公司 | Steelmaking operation method for replacing coolant with scrap steel broken material |
| CN111607677A (en) * | 2019-02-24 | 2020-09-01 | 新疆八一钢铁股份有限公司 | Operation method for reducing iron loss of molten iron torpedo ladle |
| CN111944940A (en) * | 2019-05-14 | 2020-11-17 | 江苏集萃冶金技术研究院有限公司 | Method for controlling inclusions in IF steel |
| CN113493868A (en) * | 2021-06-22 | 2021-10-12 | 新疆八一钢铁股份有限公司 | High scrap ratio converter smelting method based on molten reduced molten iron |
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Application publication date: 20221202 |
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