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Electric arc furnace steelmaking method

An electric arc furnace and molten steel technology, which is applied in the field of electric arc furnace steelmaking, can solve problems such as difficult operation, slow lime melting, and unavoidable peroxidation of molten steel

Pending Publication Date: 2022-07-08
ZHANGJIAGANG CITY GUANGDA MACHINERY FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned electric arc furnace smelting process mainly uses quicklime as the slagging material, and uses the oxidation of iron to melt the lime. The burning loss of iron is relatively large, and the slag condition is basically adjusted by the FeO content in the slag. There are difficulties in operation, slow melting of lime and The problem of incomplete melting leads to low utilization rate of slagging material and unstable dephosphorization effect
At the same time, the use of high FeO slag forming materials is easy to infiltrate with molten steel and difficult to separate
[0004] With the development of low silicification of blast furnace molten iron, the silicon content of molten iron is less than 0.35%, and it is more difficult to slag and dephosphorize in the electric arc furnace smelting process; in addition, low-phosphorus steel adopts conventional smelting methods, and it is inevitable to make molten steel after repairing and blowing in the later stage of steelmaking Peroxidation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]Treat the refining tailings, cool and sieve the refining tailings, remove the sundries, and store the under-sieves with a particle size of ≤40mm in a high-level silo. The refining tailings contain: 45-58wt% CaO, 15-30wt% Al 2 O 3 , 5-20wt% SiO 2 .

[0037] Electric arc furnace smelting: The iron and steel material with phosphorus content of 0.1% is added to the electric arc furnace for melting, and the melting temperature is kept at 1350-1400 °C. In the initial stage of melting, 0.8 wt % of refining tailings were added, and 1.6 wt % of lime was added after slagging. At the end of melting, lime 0.4 wt% was added. During the oxidation period, the furnace temperature was raised to 1500°C, 0.4wt% lime was added three times, 0.3wt% refining tailings were added after smelting for 1.5 hours, and the final slag basicity was 2.7.

[0038] Slag slag scraping and tapping, the phosphorus content after treatment is 0.013%, and the dephosphorization rate is 87%.

Embodiment 2

[0040] Treat refining tailings, cool and sieve the refining tailings, remove sundries, and store under sieves with a particle size of ≤40mm in a high-level silo. The refining tailings contain: 45-58wt% CaO, 15-30wt% Al 2 O 3 , 5-20wt% SiO 2 .

[0041] Electric arc furnace smelting: The iron and steel material with a phosphorus content of 0.12% is added to the electric arc furnace for melting, and the melting temperature is maintained at 1350-1400 °C. In the initial stage of melting, 0.8 wt % of refining tailings were added, and 1.8 wt % of lime was added after the slag was melted. At the end of melting, lime 0.3 wt% was added. During the oxidation period, the furnace temperature was raised to 1500° C., 0.4 wt% lime was added three times, and after smelting for 1.5 hours, the final slag basicity was 2.6.

[0042] Slag slag scraping and tapping, the phosphorus content after treatment is 0.015%, and the dephosphorization rate is 87.5%.

Embodiment 3

[0044] Treat the refining tailings, cool and sieve the refining tailings, remove the sundries, and store the under-sieves with a particle size of ≤40mm in a high-level silo. The refining tailings contain: 45-58wt% CaO, 15-30wt% Al 2 O 3 , 5-20wt% SiO 2 .

[0045] Electric arc furnace smelting: The steel material with phosphorus content of 0.9% is added to the electric arc furnace for melting, and the melting temperature is maintained at 1350-1400 °C. In the initial stage of melting, 0.8 wt % of refining tailings were added, and 1.5 wt % of lime was added after slagging. At the end of melting, lime 0.5 wt% was added. During the oxidation period, the furnace temperature was raised to 1500°C, 0.4wt% lime was added three times, 0.5wt% refining tailings were added after smelting for 1.5 hours, and the final slag basicity was 2.7.

[0046] Slag slag scraping and tapping, the phosphorus content after treatment is 0.012%, and the dephosphorization rate is 86.7%.

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Abstract

The invention discloses an electric arc furnace steelmaking method, and relates to the technical field of steel smelting. The electric arc furnace steelmaking method comprises the following steps that refining tailings are treated; and smelting in an electric arc furnace: adding the refining tailings in a melting stage, wherein the addition amount of the refining tailings is 0.8 wt% of the molten steel. According to the technical scheme, the refining tailings are added in the melting stage of electric arc furnace smelting to replace quick lime and molten iron, waste utilization is conducted on the refining tailings, and meanwhile the problem that the slag condition control difficulty is large in a conventional process is solved.

Description

technical field [0001] The present application relates to the technical field of steelmaking, in particular to an electric arc furnace steelmaking method. Background technique [0002] Electric arc furnace steelmaking is a method of inputting electric energy into the arc furnace through graphite electrodes, and using the arc generated between the end of the electrode and the charge as a heat source to make steel. The electric arc furnace uses electric energy as the heat source, and the atmosphere in the furnace can be adjusted, which is extremely beneficial to the smelting of steel grades containing many easily oxidizable elements. For example, the Chinese invention patent with the publication number CN109280741A discloses a method for refining austenitic stainless steel, which includes “first adding the steelmaking raw materials into an EAF electric arc furnace, spraying a mixture of carbon powder and aluminum powder, and melting the steelmaking raw materials into steel. l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/54C21C7/064
CPCC21C5/54C21C7/0645Y02P10/20
Inventor 柏京波于广文顾金才袁明祝元峰
Owner ZHANGJIAGANG CITY GUANGDA MACHINERY FORGING
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