First furnace smelting method for new electric arc furnace

A smelting method and new furnace technology, applied in the field of metallurgy, can solve the problems of energy saving, consumption reduction and cost control restricting the electric furnace smelting industry, and achieve the effects of shortening the sintering time, improving the service life of refractory materials, and shortening the smelting time.

Inactive Publication Date: 2013-10-30
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, when the first furnace of a new electric furnace is smelted, due to the long-time oven and the fact that the first furnace steel is not used as a genuine product, the energy saving and cost control of the electric furnace smelting industry are restricted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Adopt this method in a company's 70-ton high-impedance electric furnace to produce the first batch of steel in the new electric furnace furnace, steel type B, and its steps:

[0032] (1) Ingredients: add pig iron to the scrap steel, the ratio of pig iron is 26% of the total weight of the charge, and the rest is scrap steel. The first basket of material is controlled by 62% of the total load;

[0033] (2) After the first charging, use the 4th gear voltage (592V) to power on. After the arc start is stable, use the 8th gear 655V and the 10th gear 691V to supply power in turn. When the power supply reaches 2MW·h, turn on the oxygen burner to assist melt;

[0034] (3) After the power was cut off for 18 minutes before the second charging, the second charging was carried out, that is, the remaining 38% of the total amount. Use 4 gears voltage 592V to power on. After the arc is stable, use 8 gears voltage 655V and 10 gears voltage 691V to supply power in turn. After loading t...

Embodiment 2

[0038] Adopt this method to produce the first batch of steel in the new furnace of electric furnace in a company's 70-ton high-impedance electric furnace, steel grade 20, its steps:

[0039] (1) Ingredients: Add pig iron to the scrap steel, the ratio of pig iron is 28% of the total weight of the furnace charge, and the rest is scrap steel. The first basket of material is controlled at 65% of the total load;

[0040] (2) After the first charging, use the 4th gear voltage (592V) to power on. After the arc is stable, use the 8th gear voltage of 655V and the 10th gear voltage of 691V to supply power in turn. When the power supply reaches 4MW·h, start the oxygen combustion Mouth fluxing;

[0041] (3) After the power is cut off for 20 minutes before the second charging, the second charging is carried out, that is, the balance: 35% of the total amount. Adopt 4 gear voltage 592V gear voltage to energize. After the arc start is stable, use 8 gear voltage 655V and 10 gear voltage 691V...

Embodiment 3

[0045] Adopt this method in a company's 70-ton high-impedance electric furnace to produce the first batch of steel in the new electric furnace furnace, steel type B, and its steps:

[0046](1) Ingredients: pig iron is added to the scrap steel, and the ratio of pig iron is 30% of the total weight of the furnace charge, and the rest is scrap steel. The first basket of material is controlled according to 68% of the total load;

[0047] (2) After the first charging, use the 4th gear voltage (592V) to power on. After the arc start is stable, use the 8th gear voltage of 655V and the 10th gear voltage of 691V to supply power in turn. When the power supply reaches 3MW·h, start the oxygen combustion Mouth fluxing;

[0048] (3) After the power was cut off for 22 minutes before the second charging, the second charging was carried out, that is, the balance: 32% of the total amount. Use 4 gears of 592V to power on. After the arc is stable, use 8 gears of 655V and 10 gears of 691V to supp...

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PUM

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Abstract

The invention belongs to the technical field of metallurgy, relates to a first furnace smelting method of a new furnace for electric arc furnace steelmaking, and aims to provide a smelting method which can guarantee the sintering quality of a refractory material and the metallurgical quality of first furnace steel. The method comprises the following steps of: A, preparing materials, namely adding pig iron into a waste steel material, wherein the amount of the added pig iron is 25 to 30 percent of the total weight of the furnace charge, and the amount of added carbon is 1.2 to 1.4 percent of the total weight of the furnace charge; B, loading 60 to 70 percent of the total weight of the furnace charge at the first time, supplying 577 to 592V power after the first loading, supplying 637 to 671V power and 671 to 691V power in turn after arcing is stabilized, and starting an oxygen burner to contribute to smelting when the supplied power reaches 2 to 4MW.h; C, powering off for 15 to 25 minutes before second loading, wherein the second charge is the remaining furnace charge, supplying 577 to 592V power, supplying 637 to 671V power and 671 to 691V power in turn after the arcing is stabilized, and starting the oxygen burner to contribute to smelting after charging; D, after the furnace charge is smelted, powering off for 15 to 25 minutes after the temperature of a weld pool reaches 1,540 to 1,560 DEG C; and E, smelting according to the conventional process.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a first furnace smelting method of a new electric furnace. Background technique [0002] The smelting process of the first furnace of a new electric arc furnace (customarily called an electric furnace) is very important, and it directly affects the sintering quality of the ramming material in the lining of the electric furnace and the service life of the refractory material. [0003] At present, the smelting time of the first electric arc furnace is about 4 to 5 hours. In order to ensure the good sintering of the furnace lining ramming material and refractory materials (hereinafter referred to as refractory materials), after the scrap steel materials enter the furnace, the electrodes are "passed through the well" to form a certain The molten pool is first baked for a period of time, and the high-temperature molten steel is used to fully escape the moisture in the refractory mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52
CPCY02P10/20
Inventor 苏雄杰王海兵李勇黄国玖蔡国华潘伟张珉
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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