A Method of Prolonging the Service Life of Blast Furnace Main Ditch

A blast furnace, life-span technology, applied in the direction of blast furnace, blast furnace details, blast furnace parts, etc., can solve the problems of insufficient water cooling, increase of solid waste, waste of refractory materials and gas, etc., to reduce surface temperature, facilitate maintenance and repair, avoid The effect of mechanical scour

Active Publication Date: 2020-12-15
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A lot of refractory materials and gas are wasted, which increases solid waste; at the same time, it is also necessary to increase the investment in equipment such as opening machines, mud guns, dust prevention, swing nozzles or extending slag iron channels
[0005] Due to the composition of the material itself, the manufacturing process and the protection measures are not in place, the life of the traditional main channel is short
The refractories of the working layer of the traditional main channel contain SiC and SiO 2 , SiC is easily oxidized, SiO 2 Easily corroded by CaO
Without water cooling, the temperature of the refractory material is high, and the protective layer cannot be formed on the surface of the refractory material, so that the refractory material of the main channel is easily eroded by high temperature. Even if water cooling is used, due to the poor overall heat conduction, cracks will be formed inside the refractory material, making it easier for the front refractory material to Erosion, can not achieve the effect of water cooling
At the same time, its manufacturing process is made by mixing refractory materials and binders and pouring them by themselves, resulting in low volume density of refractory materials in the main channel, large internal voids, and poor mechanical erosion resistance of molten iron.

Method used

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  • A Method of Prolonging the Service Life of Blast Furnace Main Ditch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a method for prolonging the service life of the blast furnace main ditch, the steps comprising:

[0029] Lay a cooling wall with a thickness of 120mm on the inner wall and bottom of the steel channel of the blast furnace main ditch, and then successively build a layer of ultra-microporous carbon bricks with a thickness of 500mm, and microporous corundum bricks with a thickness of 380mm as the lining Floor. A galvanic couple is embedded between the microporous carbon brick layer and the microporous corundum brick layer to measure the temperature of the hot surface of the carbon brick. Change the main ditch girder of the blast furnace into a prefabricated part. When building the inner lining, place the main ditch girder horizontally, and embed both ends in the inner lining to form a slag stopper.

[0030] In terms of mass percentage, Al in the microporous corundum brick 2 o 3 Content is 85%, SiO 2 The content is 6%, the slag erosion resistance...

Embodiment 2

[0035] This embodiment provides a method for prolonging the service life of the blast furnace main ditch, the steps comprising:

[0036] Change the main ditch girder of the blast furnace into a prefabricated part, first lay a stave with a thickness of 125mm on the steel channel inner wall and bottom of the girder of the main ditch of the blast furnace, and then successively build a layer of microporous carbon bricks with a thickness of 475mm, and as an inner The thickness of the lining is a layer of microporous corundum bricks with a thickness of 400mm. The gap between the prefabricated part and the main groove is blocked by self-flowing corundum material.

[0037] In terms of mass percentage, Al in the microporous corundum brick 2 o 3 content of 83%, SiO 2 The content is 7%, the slag erosion resistance of microporous corundum bricks is ≤10%, the molten iron corrosion resistance index is ≤1.5%, the pore diameter is ≤1.0μm, the pore volume ratio is ≥70%, and the bulk density...

Embodiment 3

[0042] This embodiment provides a method for prolonging the service life of the blast furnace main ditch, the steps comprising:

[0043] Change the main ditch girder of the blast furnace into a prefabricated part, first lay a stave with a thickness of 140mm on the steel channel inner wall and the bottom of the girder of the main ditch of the blast furnace, and then successively build a layer of microporous carbon bricks with a thickness of 500mm, and as an inner The thickness of the lining is a microporous corundum brick layer of 350mm. The gap between the prefabricated part and the main groove is blocked by self-flowing corundum material.

[0044] In terms of mass percentage, Al in the microporous corundum brick 2 o 3 content of 83%, SiO 2 The content is 5%, the slag erosion resistance of microporous corundum bricks is ≤10%, the molten iron corrosion resistance index is ≤1.5%, the pore diameter is ≤1.0μm, the pore volume ratio is ≥70%, and the bulk density is 3.2g / cm 3 . ...

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Abstract

The invention provides a method for prolonging the service life of a blast furnace main trough. The method comprises the step that a lining, a microporous carbon brick layer and a cooling water are sequentially arranged in a steel tank of the blast furnace main trough from inside (the hot surface) to outside (the cold surface). The lining is a microporous corundum brick layer. The lining refractory material adopted by the method is not liable to be eroded by slag iron and is resistant to mechanical erosion, the temperature of the surface of the lining refractory material is lowered through thecooling wall, thus, the surface of the lining refractory material is covered with a slag iron protective layer, self-protection of the lining is formed, erosion of the refractory material on the surface of the main trough is slowed or prevented, and thus the service life of the blast furnace main trough is prolonged.

Description

technical field [0001] The invention belongs to the technical field of blast furnace main ditch design, and specifically relates to a method for prolonging the service life of a blast furnace main ditch, which can be applied to the main ditch design of overhauled or newly built blast furnaces, and the overhaul and reconstruction of blast furnace main ditch put into operation. Background technique [0002] In the blast furnace ironmaking production process, the main ditch of the blast furnace is the channel through which slag and molten iron flow and separate. In the main ditch, due to the difference in specific gravity between slag and molten iron, the molten iron slag and iron are separated by themselves. The molten iron enters the molten iron loading tool through the sand mouth and is transported to the steelmaking or iron casting process. The slag liquid is blocked by the skimmer and enters the slag treatment system. The main ditch is a necessary equipment for blast furna...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B7/14C21B7/04
CPCC21B7/04C21B7/14
Inventor 张正东尹腾郑华伟谢友阳罗鹏飞朱义斌李昕
Owner 武汉钢铁有限公司
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