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Argon-oxygen furnace and operation method thereof

An operation method, the technology of argon-oxygen furnace, applied in the direction of reducing gas emissions, can solve the problems of low furnace life of argon-oxygen furnace, and achieve the effect of increasing the decarburization rate, avoiding the spalling of refractory materials, and preventing the aggravation of melting loss of refractory materials

Active Publication Date: 2014-04-16
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the existing argon-oxygen furnace and its operation method, the furnace life of the argon-oxygen furnace is relatively low, generally 95-120 times

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment is a 45-ton argon-oxygen furnace equipped with 4 side blow guns, which includes a furnace shell, a furnace lining and an air gun. The furnace shell has a furnace mouth, a furnace cap, a furnace body and a furnace bottom. The material is the permanent layer, and the refractory material in the furnace lining which is in contact with the permanent layer and which is in contact with the molten steel is the working layer. The air gun is installed on the lower side of the furnace body and on the same level, and inserted into the furnace from the outside of the furnace shell. Its characteristics are:

[0031] Ⅰ The physical and chemical indicators of magnesia-calcium bricks for the working layer of the furnace lining are:

[0032] W(CaO) / % 31.2;

[0033] W(MgO) / % 64.5;

[0034] W(SiO 2 +Al 2 o 3 +Fe 2 o 3 ) / % 2.6;

[0035] Apparent porosity / % 8.2;

[0036] Bulk density / g / cm 3 3.02;

[0037] Normal temperature compressive strength / MPa 85.1...

Embodiment 2

[0056] This embodiment is a 180-ton argon-oxygen furnace equipped with 9 side blow guns, which includes a furnace shell, a furnace lining and an air gun. The furnace shell has a furnace mouth, a furnace cap, a furnace body and a furnace bottom. The material is the permanent layer, and the refractory material in the furnace lining which is in contact with the permanent layer and which is in contact with the molten steel is the working layer. The air gun is installed on the lower side of the furnace body and on the same level, and inserted into the furnace from the outside of the furnace shell. Its characteristics are:

[0057] Ⅰ The physical and chemical indicators of magnesia-calcium bricks for the working layer of the furnace lining are:

[0058] W(CaO) / % 32.29;

[0059] W(MgO) / % 61.29;

[0060] W(SiO 2 +Al 2 o 3 +Fe 2 o 3 ) / % 1.81;

[0061] Apparent porosity / % 7.1;

[0062] Bulk density / g / cm 3 3.21;

[0063] Normal temperature compressive strength / MPa...

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Abstract

The invention relates to an argon-oxygen furnace and an operation method thereof. The argon-oxygen furnace is characterized in that: I, the physical and chemical indexes of a magnesium-calcium brick for the working layer of a furnace lining meet requirements; II, a total included angle of blower guns is 108 to 120 DEG, the distance between the blower guns is no less than 380 mm, and the blower guns, blower gun bricks and adjacent bricks are bonded by using resin mortar; and III, the furnace lining undergoes maintenance and baking. The operation method is characterized in that: I, the content of Si in pre-melting liquid of smelting is no more than 0.30%; II, during blowing, the integral argon-oxygen furnace is backwardly revolved and tilted by 3 to 7 DEG; III, air feeding intensity of a top gun during decarburization in stage 1 to 3 is 0.85 to 1.40 Nm<3> / min.t; IV, the basicity of slag is 1.8 to 2.2; V, no-load time is less than 90 min, a furnace mouth is swayed down to 120 to 240 DEG, and if no-load time is greater than 90 min, on-line baking is carried out; and VI, temperature monitoring is carried out on steel plate surface temperature corresponding to easy-leaking points of the blower guns and slag lines in the whole process of furnace smelting. With the argon-oxygen furnace and the operation method thereof in the invention, the furnace life of the argon-oxygen furnace is prolonged to no less than 160 heats.

Description

technical field [0001] The invention relates to an argon oxygen furnace and its operation method. Background technique [0002] The argon-oxygen furnace has many remarkable features in smelting stainless steel, and its role in the stainless steel production process cannot be replaced by other metallurgical equipment. However, when the argon-oxygen furnace smelts stainless steel, the process temperature is high, the smelting cycle is long, the gas is stirred violently, the steel slag is scoured severely, and the furnace lining temperature changes periodically, etc., resulting in poor working conditions of the furnace lining and a low furnace life, which directly affects the production capacity. , cost and production organization. The furnace life of argon oxygen furnace is an important problem faced by stainless steel production plants, and they are all looking for a good solution. In dealing with many unfavorable factors in the smelting of argon-oxygen furnace lining, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/068
CPCY02P10/143
Inventor 张增武刘亮陈景锋马骏鹏常国栋黄晨浩
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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