Composite long-life low-cost steel ladle air brick base brick and manufacturing method thereof

A breathable brick and composite technology, which is applied in the field of steel-making refractories, can solve the problems of reduced production cost, low service life, aggravated erosion of breathable bricks and breathable brick base bricks, etc., and achieves the effect of reducing production cost and improving service life.

Active Publication Date: 2015-08-19
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the life of the ladle ventilating seat bricks produced by the existing technology is low, which is one of several key common technical problems that affect the life and cost of the refractory material of the ladle lining.
The ladle air permeable brick seat bricks produced by the prior art have the following problems and deficiencies: (1) The upper and lower parts of the air permeable brick seat brick body are casted and formed with the same grade of castable, which has low cost performance and low service life; (2) the ladle air permeable brick The body of the seat brick and the installation hole are made of two kinds of materials and two molding processes of machine pressing and pouring, which are complicated in process and high in production cost
(3) Most of the current seat bricks are square bricks. Due to the uneven wall thickness of the square bricks, thermal stress will be generated, resulting in shrinkage, deformation, and cracks in some parts of the seat bricks, shortening the service life of the seat bricks
[0003] Chinese patent document CN202097397U (application number: 201120136171.9) discloses a composite breathable brick seat brick, which is a refractory material for metallurgical equipment, including an upper seat brick and a lower seat brick, wherein the height of the lower seat brick is slightly lower than the industrial regulations The height of the residual brick core of the breathable brick. When the breathable brick is put into use, the upper seat brick is made of high-grade materials such as chrome corundum, plate corundum, zirconium corundum, white corundum, and brown corundum; the lower seat brick is made of low-grade materials. Compared with the preparation of high-grade materials as a whole, the production cost is greatly reduced. The composite air-permeable brick seat brick prepared by this patent has the following shortcomings: First, during use and burning and washing, molten steel and steel slag are The infiltration of the ring seam intensifies the erosion of the permeable brick and the permeable brick seat brick, and affects the service life; the second is to prepare the upper seat brick with high-grade materials such as chrome corundum, plate corundum, zirconium corundum, white corundum, and brown corundum, which can improve its performance. Corrosion resistance, but its thermal shock stability is poor, and cracks and fractures are prone to occur, which shortens the service life of the composite breathable brick seat brick of the invention

Method used

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  • Composite long-life low-cost steel ladle air brick base brick and manufacturing method thereof
  • Composite long-life low-cost steel ladle air brick base brick and manufacturing method thereof
  • Composite long-life low-cost steel ladle air brick base brick and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0056] A composite high-life, low-cost ladle permeable brick seat brick, the structure of which is as follows figure 1 , 2 As shown, including the seat brick body, the seat brick body is cylindrical as a whole, and the middle part of the seat brick body is provided with a mounting hole 3 passing through the seat brick body. The lower port diameter d2 is 195mm. The block body includes an upper body 1 and a lower body 2. The upper body 1 and the lower body 2 are formed by one-time casting with different castable materials. The upper body 1 is casted with high-purity chromium magnesium mullite corundum castable. h is 300mm, the lower body 2 is casted with chrome magnesium mullite corundum castable, the inner wall of the upper body is horizontally provided with grooves 4 uniformly distributed along the height direction along the circumferential direction, the number of grooves 4 is 5, and the depth of the grooves 4 is Consistent with the width, both are 6mm.

[0057] The outer ...

Embodiment 2

[0081] A composite high-life, low-cost ladle permeable brick seat brick, the same as Example 1, the difference lies in:

[0082] The diameter d1 of the upper port of the truncated cone is 150mm, and the diameter d2 of the lower port of the truncated cone is 220mm. The block body includes an upper body 1 and a lower body 2. The height h of the upper body 1 is 260 mm. The inner wall of the upper body is horizontally provided with grooves 4 uniformly distributed along the height direction along the circumferential direction. There are 3 grooves 4 and 4 grooves. The depth and width are the same, both are 10mm.

[0083] The high-purity chrome-magnesium-mullite corundum castable used in the upper body, the raw material components are as follows, all in percent by weight: 18% fused white corundum with a particle size 2 o 3 Micropowder 3.0%, fused spinel micropowder with particle size 2 o 3 Micropowder 5.0%, active SiO 2 Micropowder 1.2%, pure calcium aluminate cement 4.0%, wood ca...

Embodiment 3

[0098] A composite high-life, low-cost ladle permeable brick seat brick, the same as Example 1, the difference lies in:

[0099] The diameter d1 of the upper port of the truncated cone is 135mm, and the diameter d2 of the lower port of the truncated cone is 205mm. The block body includes an upper body 1 and a lower body 2. The height h of the upper body 1 is 270 mm. The inner wall of the upper body is horizontally provided with grooves 4 uniformly distributed along the height direction along the circumferential direction. There are 4 grooves 4 and 4 grooves. The depth and width are the same, both are 8mm.

[0100]The high-purity chrome-magnesium-mullite corundum castable used in the upper body, the raw material components are as follows, all in weight percentage: 17% fused white corundum with a particle size 2 o 3 Micropowder 4.0%, fused spinel micropowder with particle size 2 o 3 Micropowder 4.0%, active SiO 2 Micropowder 1.0%, pure calcium aluminate cement 3.75%, wood cal...

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Abstract

The invention relates to a composite long-life low-cost steel ladle air brick base brick. The composite long-life low-cost steel ladle air brick base brick comprises a base brick body, the base brick body comprises an upper body and a lower body which are molded by once casting of different cast materials. The upper body is 260 to 300 mm high, and the inner wall of the upper body is circumferentially provided with grooves uniformly distributed along the height direction. By the composite long-life low-cost steel ladle air brick base brick, cost performance is superior to that of an existing composite air brick base brick, corrosion speed is lower to more than 0.5 mm per furnace year on year, and service life is prolonged by more than ten times.

Description

technical field [0001] The invention relates to a composite high-life and low-cost ladle air-permeable brick seat brick and a preparation process thereof, belonging to the technical field of steelmaking refractory materials. Background technique [0002] The ladle is the basic container for steelmaking, shipping molten steel and refining outside the furnace such as LF and RH. The venting brick is a venting element for blowing argon into the molten steel. Air-permeable bricks, placed at the bottom of the ladle and lined with refractory components. At present, the life of the air-permeable seat brick of the ladle produced by the prior art is low, which is one of several key common technical problems affecting the life and cost of the refractory material for the working lining of the ladle. The ladle air permeable brick seat brick produced by the prior art has the following problems and deficiencies: (1) the upper and lower parts of the air permeable brick seat brick body are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/02C04B35/66
Inventor 武光君李洪建
Owner SHANDONG IRON & STEEL CO LTD
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