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Method for prolonging service life of top-bottom composite blowing converter bottom

A converter bottom and service life technology, which is applied to the bottom compound blowing converter bottom service life, prolongs the converter bottom service life, improves the roof area, and can solve the problem of affecting normal steelmaking production, shortening the converter bottom service life, and breathable bricks Erosion speed is fast and other problems, to achieve the effect of reducing smelting cycle, improving service life and improving production efficiency

Active Publication Date: 2015-01-28
红河钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of fast corrosion of air-permeable bricks and shorten the service life of the converter bottom, thus affecting the normal steelmaking production, the present invention provides a method for increasing the service life of the top and bottom combined blowing converter bottom

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The method for improving the service life of top and bottom compound blowing converter bottoms is characterized in that the steps are as follows:

[0030] (1) During the normal top-bottom compound blowing process, in addition to visual observation, measure the furnace bottom with a furnace bottom measuring rod every 8 hours, and determine the corrosion of the furnace bottom by comparing it with the original furnace bottom. Focus on the parts with severe corrosion, and draw the corrosion trend chart of the bottom of the furnace according to the data of each measurement; when the air permeability of the bottom of the furnace is 20Nm 3 When the conventional magnesia-carbon refractory breathable brick with a pressure of 1.0Mpa melts and loses 100mm per hour, after the steel is tapped and the slag is poured out, add a solidification temperature of 800 ℃ of the following mass ratio of filling materials: MgO: 75%, C: 14%, CaO: 1%, SiO 2 : 2%, Fe 2 o 3 : 0.5%, phenolic res...

Embodiment 2

[0034] The method for improving the service life of top and bottom compound blowing converter bottoms is characterized in that the steps are as follows:

[0035] (1) During the normal top-bottom compound blowing process, in addition to visual observation, measure the furnace bottom with a furnace bottom measuring rod every 10 hours, and determine the corrosion of the furnace bottom by comparing it with the original furnace bottom. Focus on the parts with severe corrosion, and draw the corrosion trend chart of the bottom of the furnace according to the data of each measurement; when the gas flow of the bottom of the furnace is 30Nm 3 When the conventional magnesia-carbon refractory ventilated brick with a pressure of 0.2 Mpa has a melting loss of 150mm per hour, after the steel is tapped and the slag is poured out, add a solidification temperature of 1000 ℃ of the following mass ratio of filling materials: MgO: 85%, C: 7%, CaO: 3%, SiO 2 : 1%, Fe 2 o 3 : 1.5%, asphalt: 2.5...

Embodiment 3

[0039] The method for improving the service life of top and bottom compound blowing converter bottoms is characterized in that the steps are as follows:

[0040] (1) During the normal top-bottom compound blowing process, in addition to visual observation, the furnace bottom is measured every 9 hours with a furnace bottom measuring rod, and the corrosion of the furnace bottom is determined by comparing with the original furnace bottom. Focus on the parts with severe corrosion, and draw the corrosion trend chart of the bottom of the furnace according to the data of each measurement; when the gas flow of the bottom of the furnace is 25Nm 3 / h, pressure of 0.6Mpa conventional magnesia-carbon refractory breathable brick melting loss of 130mm, after the steel is tapped and the slag is poured out, according to the amount of 100mm in thickness each time, add solidification temperature to the furnace 900 ℃ of the following mass ratio of filling materials: MgO: 80%, C: 10%, CaO: 2%, SiO...

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Abstract

The invention provides a method for prolonging the service life of a top-bottom composite blowing converter bottom. The method for prolonging the service life of the top-bottom composite blowing converter bottom comprises the following steps of: when melting loss of air permeable bricks at the converter bottom achieves 100-150mm, after steel is discharged completely and converter slags are poured away, adding the following repairing mass into the converter in percentage by mass according to the quantity with the shim thickness of 50-150mm each time: 75-85% of MgO, 7-14% of C, 1-3% of CaO, 1-2% of SiO2, 0.5-1.5% of Fe2O3, and 2-10% of bonding agents, and staying for 2-3 seconds; sintering the repairing mass naturally for 40-70 minutes by utilizing temperature in the converter, then sintering for 60-120 minutes again at 700-1,200 DEG C, and inputting for smelting; repeating the step (1) and the step (2) after smelting for 10-30 converters, and shimming repeatedly in the way until the converter bottom rises by 100-300mm. The service lives of the converter bottom bricks of the converter and the air permeable bricks at the converter bottom are prolonged effectively; a top-bottom composite blowing technology requirement is met; the smelting cycle is shortened; the production efficiency is improved.

Description

technical field [0001] The invention relates to a method for prolonging the service life of a converter bottom, in particular to a method for increasing the service life of a top-bottom combined blowing converter bottom, belonging to the technical field of iron and steel smelting. Background technique [0002] The breathable bricks used in steelmaking compound blowing converters are used for bottom gas supply. Due to the strong stirring of molten steel in the furnace, the corrosion and loss of the breathable bricks and the surrounding furnace bottom bricks are aggravated, which directly affects the service life of the converter bottom. In addition, air is supplied from the bottom, so that the temperature of the ventilation brick changes drastically, and the temperature difference between the blowing start and the stop blowing temperature is about 200-400 ° C, so the temperature change becomes the second factor affecting the service life of the ventilation brick. Therefore, t...

Claims

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Application Information

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IPC IPC(8): C21C5/48
Inventor 苏华林冯再武龚有川徐涛王琦军杨昌文
Owner 红河钢铁有限公司
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