CN111607677A - Operation method for reducing iron loss of molten iron torpedo ladle - Google Patents
Operation method for reducing iron loss of molten iron torpedo ladle Download PDFInfo
- Publication number
- CN111607677A CN111607677A CN201910134845.2A CN201910134845A CN111607677A CN 111607677 A CN111607677 A CN 111607677A CN 201910134845 A CN201910134845 A CN 201910134845A CN 111607677 A CN111607677 A CN 111607677A
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- China
- Prior art keywords
- molten iron
- steel
- scrap steel
- temperature
- iron
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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
- C21C1/00—Refining of pig-iron; Cast iron
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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
- C21C2300/00—Process aspects
- C21C2300/06—Modeling of the process, e.g. for control purposes; CII
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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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- 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
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses an operation method for reducing iron loss of a molten iron torpedo ladle, which is characterized in that scrap steel is processed into a crushed material in a crushing mode, the size is required to be within 100 × 100mm, and the bulk specific gravity of the crushed material is required to be more than 1.60t/m3The method comprises the steps of conveying the scrap steel to a charging position bin of a molten iron torpedo tank, calculating the adding amount of the scrap steel meeting the steel-making temperature requirement according to a blast furnace molten iron tapping temperature, wherein the blast furnace molten iron temperature/DEG C1400-. The invention can reduce the chemical reaction generated by adding slag materials such as pellets, dolomite and the like in the smelting process and reduce the frequency of manual intervention of oxygen lance operation in the smelting process.
Description
Technical Field
The invention relates to an operation method for reducing iron loss of a molten iron torpedo ladle.
Background
At the present stage, iron consumption reduction work of iron and steel enterprises mainly adopts the modes of increasing the volume of a scrap steel hopper, adding scrap steel in a distributed mode and the like, and the scrap steel is added into a furnace for smelting at one time. However, because the operation method of secondary scrap feeding is not allowed by the influence factors such as production rhythm and the like, the actual amount of scrap fed into the furnace becomes a limiting link for reducing iron consumption, and when molten iron still has heat surplus, slag charge type cooling agents are basically adopted to balance the heat balance in the furnace, so that accidents such as splashing and the like caused by overhigh temperature in the furnace are prevented. The adoption of the coolant for balancing the heat in the furnace not only increases the production cost, but also increases the slag amount in the furnace and further increases the consumption of iron and steel materials.
Disclosure of Invention
The invention aims to provide an operation method for reducing iron consumption of a molten iron torpedo ladle, which can reduce chemical reactions generated by adding slag materials such as pellets, dolomite and the like in a smelting process, reduce the frequency of manual intervention of oxygen lance operation in the smelting process, and is more favorable for the operability and stability of one-key steel making.
The invention aims to realize the operation method for reducing the iron consumption of the molten iron torpedo ladle, which is to process the scrap steel into the crushed material in a crushing mode, wherein the required size is within 100 × 100mm, and the bulk specific gravity of the crushed material is required to be more than 1.60t/m3The method comprises the steps of conveying the scrap steel to a charging position bin of a molten iron torpedo tank, calculating the adding amount of the scrap steel meeting the steel-making temperature requirement according to a blast furnace molten iron tapping temperature, wherein the blast furnace molten iron temperature/DEG C1400-.
The balance calculation model of the molten iron composition and the temperature input heat of each blast furnace adopts a feed bin to add broken waste steel materials to balance the redundant heat in a torpedo tank:
Qscrap steel=mScrap steel×{CFixing device•（tFusion furnace-tInitial) + latent heat of fusion of scrap + CLiquid for treating urinary tract infection•（ tGo out-tFusion furnace）}
The cooling effect of 1kg of scrap steel when the temperature of the molten iron reaches 1350 ℃ is as follows: qScrap steel=1254.11 kJ/kg。
QMolten iron= m molten iron × { CFixing device•（tFusion furnace-tInitial) + latent heat of fusion of molten iron + CLiquid for treating urinary tract infection•（ tGo out-tFusion furnace）}
The physical heat of 1kg molten iron at 1 ℃ reduction is: qIron=447.98kJ/kg，
mMolten iron×QMolten iron=mScrap steel×QScrap steel
The addition amount of the broken scrap steel is determined according to the heat balance in the molten iron torpedo tank by calculating the heat generated by reducing 1 ℃ of 1kg of molten iron, and is shown in tables 1 and 2:
TABLE 1 Torpedo can temperature variation trend table
| Item | Required temperature/DEG C for steelmaking | Loss per deg.C during transportation | Molten iron charging temperature/° c | temperature/DEG C of waste steel added to torpedo tank |
| Temperature change | 1350 | 80-100 | 1430-1450 | T≥1470 |
TABLE 2 horizontal calculation table for torpedo ladle and scrap steel
The main improvement effect is as follows:
1. the operation method for reducing the iron consumption of the molten iron torpedo ladle breaks through the restrictive link that the scrap steel cannot be added into the converter in a sufficient amount in the process of reducing the iron consumption, reduces the molten iron consumption by utilizing the condition of sufficient waste steel resources in the market, and improves the yield of qualified steel billets.
2. The operation method for reducing the iron loss of the molten iron torpedo ladle is adopted, the advantages of large tonnage of molten iron, sufficient stirring force, good heat preservation effect and the like of the torpedo ladle are utilized, the waste steel in the torpedo ladle is fully melted, the component change condition is determined through the steel-making molten iron assay process, and the influence of the uncertainty of P, S harmful elements in the traditional waste steel adding mode on the adding amount of smelting slag and the quality control is avoided.
3. The operation method for reducing the iron consumption of the molten iron torpedo ladle is adopted, the chemical reaction generated by adding the slag materials such as the pellets, the dolomite and the like in the smelting process is reduced, the frequency of manual intervention of the oxygen lance operation in the smelting process is reduced, and the operability and the stability of one-key steel making are facilitated.
Detailed Description
An operation method for reducing iron loss of a molten iron torpedo ladle is characterized in that scrap steel is processed into a crushed material in a crushing mode, the size is required to be within 100 × 100mm, and the bulk specific gravity of the crushed material is required to be more than 1.60t/m3The method comprises the steps of conveying the scrap steel to a charging position bin of a molten iron torpedo tank, calculating the adding amount of the scrap steel meeting the steel-making temperature requirement according to a blast furnace molten iron tapping temperature, wherein the blast furnace molten iron temperature/DEG C1400-.
Claims (1)
1. An operation method for reducing iron loss of a molten iron torpedo ladle is characterized in that scrap steel is processed into a crushed material in a crushing mode, and the size of the crushed material is required to be 100 × 1Within 00mm, and the specific gravity of the crushed material is required to be more than 1.60t/m3The method comprises the steps of conveying the scrap steel to a charging position bin of a molten iron torpedo tank, calculating the adding amount of the scrap steel meeting the steel-making temperature requirement according to a blast furnace molten iron tapping temperature, wherein the blast furnace molten iron temperature/DEG C1400-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910134845.2A CN111607677A (en) | 2019-02-24 | 2019-02-24 | Operation method for reducing iron loss of molten iron torpedo ladle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910134845.2A CN111607677A (en) | 2019-02-24 | 2019-02-24 | Operation method for reducing iron loss of molten iron torpedo ladle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111607677A true CN111607677A (en) | 2020-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910134845.2A Pending CN111607677A (en) | 2019-02-24 | 2019-02-24 | Operation method for reducing iron loss of molten iron torpedo ladle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111607677A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113215357A (en) * | 2021-04-06 | 2021-08-06 | 马鞍山钢铁股份有限公司 | Molten iron treatment method |
| CN115125359A (en) * | 2021-03-29 | 2022-09-30 | 宝山钢铁股份有限公司 | Method and system for hot charging and hot returning of metallized pellets of rotary hearth furnace to converter for steelmaking |
| CN115418431A (en) * | 2022-08-03 | 2022-12-02 | 新疆八一钢铁股份有限公司 | Operation method for external pretreatment of high-sulfur steel scrap |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2019
- 2019-02-24 CN CN201910134845.2A patent/CN111607677A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 王学峰等: "宁钢鱼雷罐加废钢试验获成功", 《中国冶金报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115125359A (en) * | 2021-03-29 | 2022-09-30 | 宝山钢铁股份有限公司 | Method and system for hot charging and hot returning of metallized pellets of rotary hearth furnace to converter for steelmaking |
| CN115125359B (en) * | 2021-03-29 | 2024-01-09 | 宝山钢铁股份有限公司 | Method and system for steelmaking by hot charging and hot feeding of metallized pellets of rotary hearth furnace |
| CN113215357A (en) * | 2021-04-06 | 2021-08-06 | 马鞍山钢铁股份有限公司 | Molten iron treatment method |
| CN115418431A (en) * | 2022-08-03 | 2022-12-02 | 新疆八一钢铁股份有限公司 | Operation method for external pretreatment of high-sulfur steel scrap |
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Application publication date: 20200901 |