Bottom dusting electrical furnace steelmaking process

An electric arc furnace and powder spraying technology is applied in the field of electric arc furnace steelmaking, which can solve the problems of inability to accurately control the addition amount, large cost and environmental pollution, and insufficient dephosphorization efficiency, so as to speed up the mass transfer and heat transfer speed and shorten the smelting. The effect of time and slag gold reaction speed increasing

Inactive Publication Date: 2010-07-28
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the addition of modern electric arc furnace slag material still adopts the traditional top block addition, which has the problems of slow melting speed, insufficient dephosphorization efficiency, low utilization rate of slag material, inability to accurately control the amount of slag added, high cost and environmental pollution.

Method used

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  • Bottom dusting electrical furnace steelmaking process
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  • Bottom dusting electrical furnace steelmaking process

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Effect test

Embodiment 1

[0018] The invention discloses a bottom-spraying electric arc furnace steelmaking method, specifically, boron steel is smelted in a 25t bottom-spraying electric arc furnace. Such as figure 2 As shown, in the electric arc furnace steelmaking method based on the top feeding system, a bottom gun 3 is set in the center of the bottom of the electric arc furnace; the bottom gun 3 is a porous injection element; the carrier gas is Ar; the particle size of the injection powder is 0.01 ~0.10mm.

[0019] Smelting process: At the end of the melting period and the beginning of the oxidation period, a part of the slagging agent is sprayed into the molten pool through the bottom gun through the bottom gun. The injection amount of different slagging agents accounts for the percentage of the slagging agent added in the furnace respectively: Limestone or quicklime is 20-50wt%, iron oxide or concentrate powder is 70-100wt%, dolomite is 40-50wt%, fluorite is 40-60wt%; the injection pressure is ...

Embodiment 2

[0022] The invention discloses a bottom powder-spraying electric arc furnace steelmaking method, specifically an 85t bottom powder-spraying electric arc furnace for smelting aluminum steel. Such as image 3 As shown, in the electric arc furnace steelmaking method based on the top charging system, the bottom gun 3 is arranged symmetrically between 0.2 and 0.5 times the radius of the furnace bottom from the center of the furnace bottom; the bottom gun 3 adopts slit-type ventilation bricks; The particle size is 0.01 ~ 0.10mm.

[0023] Smelting process: At the end of the melting period and the beginning of the oxidation period, a part of the slagging agent is sprayed into the molten pool through the bottom gun through the bottom gun. The injection amount of different slagging agents accounts for the percentage of the slagging agent added in the furnace respectively: Limestone or quicklime is 20-50wt%, iron oxide or concentrate powder is 70-100wt%, dolomite is 40-50wt%, fluorite i...

Embodiment 3

[0026] The invention discloses a bottom-spraying electric arc furnace steelmaking method, specifically smelting chromium-manganese-titanium steel in a 130t bottom-spraying electric arc furnace. Such as Figure 4 As shown, the eccentric furnace bottom tapping electric arc furnace steelmaking method based on the top feeding system is provided with two bottom guns 3 at the bottom of the electric arc furnace, and the bottom guns 3 are located between 0.5 and 0.7 times the furnace bottom radius from the center of the furnace bottom. Asymmetric arrangement; the bottom gun 3 adopts double-layer casing nozzles; the particle size of the sprayed powder is 0.01-0.10mm.

[0027] Smelting process: At the end of the melting period and the beginning of the oxidation period, a part of the slagging agent is sprayed into the molten pool through the bottom gun through the bottom gun. The injection amount of different slagging agents accounts for the percentage of the slagging agent added in the ...

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Abstract

The invention relates to a bottom dusting electrical furnace steelmaking process. The technical scheme includes that the bottom of an electrical furnace 1 is provided with 1-6 bottom guns 3 based on electrical furnace steelmaking method with precharing system, current-carrying gas is adopted to blow powder into a metal pool by 1-6 bottom guns 3, and blowing amount of powder is 20-100wt% of addition when the powder is added into the furnace; wherein, the bottom guns 3 are arranged symmetrically or asymmetrically 0-0.7 time of furnace bottom radius away from the furnace bottom center; the bottom gun 3 is in contact or non-contact structure; the current-carrying gas is one of Ar, N2, natural gas, O2 and CO2; the powder is one or more than one of ground quick lime, limestone powder, ferric oxide powder, concentrate fines, carbon dust, dolomite powder, flousper powder, calcium carbide powder and alloy powder; powder granularity is 0.01-0.10mm; blowing technological parameters include that pressure is 0.3-1.2MPa, gas supply flow is 0.1-1.0Nm3/t steel and powder gas ratio is 4-10. The invention has the characteristics that stirring effect is enhanced, metal material yield is improved and residue material utilization ratio is improved, duration of heating is shortened and steel quality is improved.

Description

technical field [0001] The invention belongs to the technical field of electric arc furnace steelmaking. In particular, it relates to a bottom-spraying electric arc furnace steelmaking method. technical background [0002] With the development of electric arc furnace technology, especially the emergence of ultra-high power electric arc furnace (UHP), the electric arc furnace has ended its mission of only smelting special steel and high alloy steel, and has become a high-speed melting metal container, only retaining the traditional electric arc furnace. Melting and oxidation functions, but it is also easy to cause the problem of uneven temperature and composition of molten steel in the furnace. At the end of the last century, the gas-blowing and stirring technology at the bottom of the electric arc furnace appeared, which injected N 2 , Ar, CO 2 , CO, CH 4 , O 2 Other gases are blown into the molten pool in the furnace according to the process requirements to achieve gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52
CPCY02P10/143Y02P10/20
Inventor 倪红卫周建安张华罗荣华何环宇
Owner WUHAN UNIV OF SCI & TECH
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