Smelting method capable of reducing steel and iron material consumption of electric furnace steelmaking

An electric furnace steelmaking and smelting method technology, applied in the field of iron and steel metallurgy, can solve the problems of high iron content in slag, achieve the effects of reducing the consumption of iron and steel materials, reducing the influence of molten pool temperature, and slowing down the speed of blending

Inactive Publication Date: 2018-09-25
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems existing in the smelting of the existing electric arc furnace without electricity, the present invention provides a method for reducing the consumption of iron and steel materials in electric furnac

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The technical solution of the invention is used for smelting in a FUCHS electric arc furnace with a nominal capacity of 100t.

[0023] After tapping in the previous smelting cycle, 10-20t of steel and 3-5t of slag are left in the electric furnace, and the furnace body is shaken after tapping.

[0024] Then, 25t of scrap steel is added to the furnace at one time by driving and transporting. Add 500kg of lime from the high-level silo after the scrap steel has been blended. After that, the primary molten iron is blended into the furnace from the molten iron chute through the hydraulic device. The weight of the primary molten iron is 65t, and the blending time is 3 minutes. After 10 minutes of smelting, add secondary molten iron, the weight of secondary molten iron is 20t, and the time for adding is 6 minutes.

[0025] Turn on the four furnace wall oxygen lances after all the molten iron has been blended, and set the oxygen blowing pressure of the furnace wall oxygen lanc...

Embodiment 2

[0030] The technical solution of the invention is used for smelting in a FUCHS electric arc furnace with a nominal capacity of 100t.

[0031] After tapping in the previous smelting cycle, 10-20t of steel and 3-5t of slag are left in the electric furnace, and the furnace body is shaken after tapping.

[0032] Then, 20t of scrap steel is added to the furnace at one time through driving transfer. Add 600kg of lime from the high-level silo after the scrap steel has been blended. After that, the primary molten iron is blended into the furnace from the molten iron chute through the hydraulic device. The weight of the primary molten iron is 75t, and the blending time is 3.5 minutes. After 12 minutes of smelting, add secondary molten iron, the weight of secondary molten iron is 15t, and the time for adding is 5 minutes.

[0033] Turn on the four furnace wall oxygen lances after all the molten iron has been blended, and set the oxygen blowing pressure of the furnace wall oxygen lance...

Embodiment 3

[0038] The technical solution of the invention is used for smelting in a FUCHS electric arc furnace with a nominal capacity of 100t.

[0039] After tapping in the previous smelting cycle, 10-20t of steel and 3-5t of slag are left in the electric furnace, and the furnace body is shaken after tapping.

[0040] Then, 30t of scrap steel is added to the furnace at one time by driving and transporting. Add 600kg of lime from the high-level silo after the scrap steel has been blended. After that, the primary molten iron is blended into the furnace from the molten iron chute through the hydraulic device. The weight of the primary molten iron is 82t, and the blending time is 3 minutes; the secondary molten iron operation is not performed.

[0041] Open the four furnace wall oxygen lances after all the molten iron has been blended, and set the oxygen blowing pressure of the furnace wall oxygen lance to 0.6MPa; open the furnace door oxygen lance after blowing for 3 minutes, and set the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a smelting method capable of reducing steel and iron material consumption of electric furnace steelmaking. The smelting method comprises the following specific steps: in the furnace burden construction, controlling the ratio of scrap steel to be 15% to 27%, and the ratio of molten iron to be 73% to 85%; transporting the scrap steel by a travelling crane, and adding the scrap steel into a furnace from the top of the furnace once; after the scrap steel is added completely, adding 5kg/t lime into the furnace through an overhead bunker; adding the molten iron into the furnace twice, wherein the molten iron added for the first time accounts for 75% or above of the total amount of the molten iron and is added at the rate of 20-30t/min, and the molten iron added for the second time accounts for 25% or lower of the total amount of the molten iron and is added at the rate of 2-5t/min; and after the first package of molten iron is added completely, starting oxygen blowingoperation, and at the same time, adding the lime into the furnace for slagging, wherein the slag basicity during the entire smelting process is 2.5 +/- 0.5. The smelting method can solve the problemsof splashing in the smelting process and high total iron content of slag under the condition of hot-charging molten iron ratio of 73%-85%, thereby achieving the purpose of reducing the consumption ofsteel and iron materials.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a smelting method for reducing consumption of steel materials in electric furnace steelmaking. Background technique [0002] As the main raw material for electric furnace smelting, molten iron can provide carbon source, heat and reduce the content of residual elements, which can greatly reduce the power consumption in the smelting process, realize the reduction of smelting cost and the improvement of billet quality. However, when the electric furnace is smelted with a high molten iron ratio, the molten pool reacts violently, and the molten steel is easy to overflow the furnace door; in addition, the content of iron oxide in the slag is high, the iron loss of slag flow is large, and the consumption of steel materials is high. When the existing electric furnace adopts high iron-water ratio to organize production, the smelting process adopts the operation mode of...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C21C5/52
CPCC21C5/52Y02P10/20
Inventor 管挺邹长东刘飞
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap