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 nor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] The method for increasing the service life of the bottom of the top and bottom combined converting converter is characterized by going through the following steps:

[0030] (1) In the normal top and bottom composite blowing process, in addition to visual observation, the bottom of the furnace is measured with the bottom measuring rod every 8 hours, and the corrosion of the bottom of the furnace is determined by comparison with the original furnace bottom. Focus on the severely corroded parts, and draw the bottom erosion trend chart based on the data of each measurement; when the ventilation rate of the bottom of the furnace is 20Nm 3 / h, when the conventional magnesia-carbon refractory brick with a pressure of 1.0Mpa melts and loses 100mm, after the tapping is completed and the slag is drained, the solidification temperature is added to the furnace at a thickness of 50mm each time Filling materials with the following mass ratios at 800°C: MgO: 75%, C: 14%,...

Example Embodiment

[0033] Example 2

[0034] The method for increasing the service life of the bottom of the top and bottom combined converting converter is characterized by going through the following steps:

[0035] (1) In the normal top and bottom composite blowing process, in addition to visual observation, the bottom of the furnace is measured every 10 hours with the bottom measuring rod, and the corrosion of the bottom of the furnace is determined by comparison with the original furnace bottom. Focus on the severely corroded parts, and draw the bottom erosion trend chart based on the data of each measurement; when the ventilation rate at the bottom of the furnace is 30Nm 3 / h, when the conventional magnesia-carbon refractory brick with a pressure of 0.2 Mpa melts and loses 150mm, after the tapping is completed and the slag is poured out, the curing temperature is added to the furnace at a thickness of 150mm each time Filling charge with the following mass ratios at 1000°C: MgO: 85%, C: 7%, CaO:...

Example Embodiment

[0038] Example 3

[0039] The method for increasing the service life of the bottom of the top and bottom combined converting converter is characterized by going through the following steps:

[0040] (1) In the normal top-bottom compound blowing process, in addition to visual observation, the bottom of the furnace is measured with a bottom measuring rod every 9 hours, and the corrosion of the bottom of the furnace is determined by comparison with the original furnace bottom. Focus on the severely corroded parts, and draw the bottom erosion trend chart based on the data of each measurement; when the ventilation rate at the bottom of the furnace is 25Nm 3 / h, when the conventional magnesia-carbon refractory brick with a pressure of 0.6Mpa melts and loses 130mm, after the tapping is completed and the slag is poured out, the solidification temperature is added to the furnace at a thickness of 100mm each time Filling charge with the following mass ratios at 900℃: MgO: 80%, C: 10%, CaO: 2...

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PUM

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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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