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Rapid converter protection method for front large surface of converter

A fast, converter technology, applied in the field of metallurgy, can solve the problems of insufficient impact resistance, local furnace lining thinning, unfavorable dephosphorization, etc., to improve the safety of use, improve production efficiency, and reduce furnace repair costs.

Pending Publication Date: 2021-05-28
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, magnesium-containing materials are added during the smelting process to ensure that the MgO content in the slag is 8%-10%. splash
In addition, this repairing method mainly relies on MgO to protect the furnace, which has insufficient impact resistance. When large scrap steel (heavy scrap) is added due to the huge impact force, it will still damage the front surface and form a pit-like depression, resulting in local thinning of the furnace lining.

Method used

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  • Rapid converter protection method for front large surface of converter
  • Rapid converter protection method for front large surface of converter
  • Rapid converter protection method for front large surface of converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) At the end of converter blowing, the sub-lance TSO is used to determine the oxygen, and the oxygen activity is 500ppm.

[0039] 2) According to the oxygen activity of 500ppm, determine the coke consumption of 30kg. During the period from 1 minute of tapping to the end of tapping, the coke is put into the surface of the slag in the furnace. Composition mass percent of coke: 10% of ash, 4% of volatile matter, and 86% of fixed carbon. Particle size: ≤10mm.

[0040] 3) Confirm that the furnace area to be repaired is 4m 2 , 1.5t of magnesite and 1.0t of bar waste cutting head are loaded into the scrap steel bucket in advance. Magnesite Composition: Chemical Composition MgO: 42%, CO 2 : 48%, FeO: 7%, and the rest are impurities.

[0041] 4) After tapping, shake the furnace to 60 degrees, and quickly add the magnesite in the scrap bucket and the waste cutting head of the bar into the furnace. Then shake the furnace quickly to about 95 degrees and stay for 10 seconds, ...

Embodiment 2

[0048] 1) At the end of converter blowing, the sub-lance TSO is used to determine the oxygen, and the oxygen activity is 700ppm.

[0049] 2) According to the oxygen activity of 700ppm, determine the coke consumption of 40kg. During the period from 1 minute of tapping to the end of tapping, the coke is put into the surface of the slag in the furnace. Composition mass percent of coke: 8% ash, 6% volatile matter, 86% fixed carbon. Particle size: ≤10mm.

[0050] 3) Confirm that the furnace area to be repaired is 2m 2 , 1.0t of magnesite and 0.6t of bar waste cutting head are loaded into the scrap steel bucket in advance. Magnesite Composition: Chemical Composition MgO: 41%, CO 2 : 47%, FeO: 9%, and the rest are impurities.

[0051] 4) After tapping, shake the furnace to 60 degrees, and quickly add the magnesite in the scrap bucket and the waste cutting head of the bar into the furnace. Then quickly shake the furnace to about 95 degrees and stay for 10 seconds, finally shake ...

Embodiment 3

[0058] 1) At the end of converter blowing, the sub-lance TSO is used to determine the oxygen, and the oxygen activity is 900ppm.

[0059] 2) According to the oxygen activity of 900ppm, determine the consumption of 50kg of coke. During the period from 1 minute of tapping to the end of tapping, the coke is put into the surface of the slag in the furnace. Composition mass percent of coke: 12% ash, 1% volatile matter, 87% fixed carbon. Particle size: ≤10mm.

[0060] 3) Confirm that the furnace area to be repaired is 5m 2 , 1.5t of magnesite and 1.0t of bar waste cutting head are loaded into the scrap steel bucket in advance. Magnesite Composition: Chemical Composition MgO: 40%, CO 2 : 46%, FeO: 9%, and the rest are impurities.

[0061] 4) After tapping, shake the furnace to 60 degrees, and quickly add the magnesite in the scrap bucket and the waste cutting head of the bar into the furnace. Then shake the furnace quickly to about 95 degrees and stay for 10 seconds, finally sh...

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Abstract

The invention belongs to the field of metallurgy, and particularly relates to a rapid converter protection method for a front large surface of a converter. The method comprises the steps that nut coke is added to deoxidize and adjust final slag according to a converter end point oxygen determination and oxygen activity value at the tapping time, the oxidability of the slag is reduced, the final slag FeO is adjusted to 7-10%, then raw magnesite and waste bar cutting heads are poured into the converter from the front of the converter by using a waste steel hopper, the raw magnesite is rapidly decomposed into a high-melting-point substance MgO in a high-temperature environment in the converter, and a large amount of heat is absorbed, so that high-melting-point substances such as MgO, C2S and C3S in the slag are rapidly separated out and condensed and are adhered to the waste cutting heads of the bars, and a structure similar to reinforced concrete is formed and is firmly combined on the converter lining. The method is easy to implement, low in cost, short in sintering time, long in converter protection period, beneficial for improving the converter operation rate and capable of helping enterprises to increase the yield and the benefits.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a large-surface fast furnace protection method in front of a converter. Background technique [0002] There are many names for the big noodles in front of the converter, such as slag noodles and steel facing noodles. In oxygen top-blown converter steelmaking, the lining of the converter is subjected to mechanical impact, alternating thermal stress and severe chemical corrosion in a strong oxidative environment, and the lining will be corroded. Therefore, a complete furnace protection process is required to complete the furnace protection task. During the entire steelmaking process of the converter, the large front face of the converter is easily damaged by mechanical impact when mixing scrap steel and molten iron. It is the part of the furnace lining that corrodes the fastest and is also a key part of the hidden danger of furnace penetration. At present, converters in the industry main...

Claims

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Application Information

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IPC IPC(8): C21C5/44C21C5/36
CPCC21C5/443C21C5/36
Inventor 于飞蒋鲤平张天管挺徐建飞刘宇龙
Owner ZENITH STEEL GROUP CORP
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