Low-cost efficient dephosphorization smelting process for electric arc furnace

A furnace dephosphorization and process technology, applied in electric furnaces, process efficiency improvement, furnaces, etc., can solve problems such as dephosphorization oxygen position, basicity, and temperature contradictions between theoretical requirements, enhance process matching ability, and flexible and diverse raw material structures The effect of chemical and raw material adaptability is strong

Inactive Publication Date: 2013-12-11
德龙钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention advances the addition time of auxiliary materials in the traditional electric arc furnace smelting process to the batching stage by performing a reasonable batching process in the electric arc furnace charging stage, and solves the melting process of cold raw and auxiliary materials by reasonably arranging the distribution structure of cold raw and auxiliary materials in the electric arc furnace Dephosphorization oxygen position, alkalinity, temperature theory needs contradictory problems, realize the dephosphorization process of electric arc furnace smelting throughout the whole process from the beginning to the end of melting, so as to achieve the purpose of efficient dephosphorization

Method used

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  • Low-cost efficient dephosphorization smelting process for electric arc furnace

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Take a 100-ton ultra-high power electric arc furnace with 5 furnace wall oxygen lances as an example:

[0039] (1) Put 60 tons of ferronickel, 15 tons of steel scrap, 15 tons of iron oxide balls, and 7 tons of lime into the material basket in sequence: ① 10 tons of nickel iron, ② 5 tons of iron oxide balls, 2 tons of lime, ③ 20 tons of ferronickel, ④ 5 tons of iron oxide balls, 3 tons of lime, ⑤ 30 tons of nickel iron, ⑥ 5 tons of iron oxide balls, 2 tons of lime, ⑦ 15 tons of steel scrap.

[0040] (2) After the raw materials in the material basket are loaded into the electric arc furnace, the electricity is smelted, and the furnace wall gun is fully opened. After the molten pool appears, the furnace door gun blows oxygen, and the oxygen supply intensity is controlled at 1.5Nm 3 / min.t steel, after the slag surface in the furnace is basically free of solid alloys, take a steel sample to test the composition, and add 200kg of fluorite depending on the fluidity of the sl...

Embodiment 2

[0045] Take a 60-ton ultra-high power electric arc furnace with 3 furnace wall oxygen lances as an example:

[0046](1) Put 35 tons of ferronickel, 3 tons of stainless steel scrap, 8 tons of iron oxide balls, and 4 tons of lime into the material basket in order of hierarchy: ① 2 tons of iron oxide balls, 1 ton of lime, ② 15 tons of nickel Iron, ③ 4 tons of iron oxide balls, 2 tons of lime, ④ 20 tons of ferronickel, ⑤ 2 tons of iron oxide balls, 1 ton of lime, ⑥ 3 tons of steel scrap.

[0047] (2) After the raw materials in the material basket are loaded into the electric arc furnace, the electricity is smelted, and the furnace wall gun is fully opened. After the molten pool appears, the furnace door gun blows oxygen, and the oxygen supply intensity is 1.2Nm 3 / min.t steel, the oxygen supply of the furnace door gun reaches about 1000Nm 3 Stop blowing oxygen. Before the solid alloy in the furnace is completely melted for 2 to 3 minutes, use a professional sampler to take a sa...

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Abstract

A low-cost efficient dephosphorization smelting process for electric arc furnace belongs to the field of electric arc furnace smelting. According to the invention, reasonable blending process is carried out in a charging stage of the electric arc furnace; accessories in a traditional electric arc furnace smelting process is moved to a charging stage; through reasonable distribution of the cold raw materials and accessories in the electric arc furnace, problems of contradiction of theoretical demands of the dephosphorization oxygen potential, alkalinity and temperature during melting process of the cold raw materials and accessories is solved; and smelting dephosphorization process of the electric arc furnace runs through the whole process from starting to the end of the melting, so as to achieve the goal of efficient dephosphorization. The invention has the following advantages: the difficulty in dephosphorization of electric arc furnace traditional smelting process is solved; dephosphorization is basically realized when the melting down of the cold materials; and the process realizes dephosphorization rate of 75%-90%, rephosphorization rate after deslagging less than 5%, and end point phosphorus lower than 0.01%.

Description

technical field [0001] The invention belongs to the technical field of electric arc furnace smelting, and in particular relates to an electric arc furnace dephosphorization smelting process with low cost and high efficiency. Background technique [0002] Phosphorus is a harmful element in most steels. Because it is easy to segregate at the grain boundary, it causes the steel to be "cold and brittle", which significantly reduces the low-temperature impact toughness, welding performance and cold bending performance of the steel. Therefore, it becomes one of the main elements to be removed from steel. one. Phosphorus removal methods mainly include reductive dephosphorization, pre-dephosphorization of molten iron and dephosphorization during smelting. Due to the limitations of process cost and technical conditions of raw materials, phosphorus is still mainly removed by smelting process. [0003] At present, the research on the high-efficiency dephosphorization process of conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52
CPCY02P10/20
Inventor 易操孟宪成俞飞韩茜
Owner 德龙钢铁有限公司
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