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Anti-erosion mullite brick for blast furnace and preparation method thereof

A mullite brick, anti-corrosion technology, applied in the field of mullite bricks, can solve the problems of poor high temperature performance, low strength, weak impermeability, etc., to achieve longevity, low porosity, and strong impermeability Effect

Active Publication Date: 2014-03-19
SHANDONG REFRACTORIES GRP LUNAI KILN REFRACTORYCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NZM-40 dense clay bricks were originally used in the bottom of blast furnaces, and GL-65 high-alumina bricks were used in the hearth. The disadvantages are: low strength, poor high temperature performance, weak impermeability, etc.

Method used

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  • Anti-erosion mullite brick for blast furnace and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The anti-corrosion mullite brick described in this embodiment consists of the following raw materials in parts by weight:

[0028] 15 parts of fused corundum with a particle size of 3-1 mm, 28 parts of synthetic mullite with a particle size of 3-1 mm, 20 parts of fused corundum with a particle size of <1 mm, 20 parts of fused corundum with a particle size of 0.074 mm, and a particle size of 0.21 - 3 parts of white quartz with a particle size of 0.12mm, 10 parts of α-alumina with a particle size of ≤5μm, 4 parts of clay with a particle size of 0.074mm, and 3.5 parts of binder pulp.

[0029] The preparation steps of anti-corrosion mullite brick are as follows:

[0030] Fused corundum with a particle size of 0.074mm, white quartz with a particle size of 0.21-0.12mm, α-alumina with a particle size of ≤5μm, and clay with a particle size of 0.074mm are pre-mixed together and mixed in a double-screw mixer. Prepare for 10 minutes to fully mix the fine powder and disperse the f...

example 1

[0032] Example 1 detection data: Al 2 o 3 Content 83.46%, Fe 2 o 3 Content 0.54%; load softening start temperature above 1700℃; porosity 12.2%; bulk density 3.07g / cm 3 ; Compressive strength 125MPa; Linear change rate (1450℃*3h) 0.1%.

Embodiment 2

[0034] The anti-corrosion mullite brick for blast furnace described in this embodiment is composed of the following raw materials in parts by weight:

[0035] 22 parts of fused corundum with a particle size of 3‐1mm, 21 parts of synthetic mullite with a particle size of 3‐1mm, 23 parts of fused corundum with a particle size of 1‐0mm, 15 parts of fused corundum with a particle size of 0.074mm, and a particle size of 5 parts of 0.21-0.12mm white quartz, 9 parts of high-temperature alumina with a particle size of ≤5μm, 5 parts of clay with a particle size of 0.074mm, and 4.5 parts of binder pulp.

[0036] The preparation steps of anti-corrosion mullite brick are as follows:

[0037] Fused corundum with a particle size of 0.074mm, white quartz with a particle size of 0.21-0.12mm, α-alumina with a particle size of ≤5μm, and clay with a particle size of 0.074mm are pre-mixed together and mixed in a double-screw mixer. Prepare for 15 minutes to fully mix the fine powder and disperse...

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Abstract

The invention relates to an anti-erosion mullite brick for a blast furnace and a preparation method thereof. The anti-erosion mullite brick is produced from the following raw materials in parts by weight: 15-30 parts of fused corundum having granularity ranging from 3 to 1 mm, 12-28 parts of synthetic mullite having granularity ranging from 3 to 1 mm, 20-28 parts of fused corundum having granularity of less than 1mm, 10-20 parts of fused corundum having granularity of 0.074mm, 3-6 parts of white quartz having granularity ranging from 0.21 to 0.12mm, 8-10 parts of alpha-aluminum oxide having granularity of less than or equal to 5 microns, 4-6 parts of clay having granularity of 0.074mm, and 3-5 parts of binding agent. The anti-erosion mullite brick for the blast furnace provided by the invention has the characteristics of low porosity, low impurity content, high strength, good high-temperature performance, excellent erosion resistance and high penetration resistance; the anti-erosion mullite brick is especially applicable to a vanadium-titanium blast furnace; the anti-erosion mullite brick is capable of maintaining the structure stability under high temperature load for a long time; as a result, the long service life of the vanadium-titanium blast furnace is greatly guaranteed.

Description

technical field [0001] The invention relates to a mullite brick, in particular to an erosion-resistant mullite brick for a blast furnace and a preparation method thereof. Background technique [0002] With the improvement of blast furnace smelting technology, modern blast furnaces are developing in the direction of large-scale, long-life and high-efficiency. Generally, the age of the first-generation blast furnace is required to be 8 to 12 years. NZM-40 dense clay bricks were originally used for the bottom of the blast furnace, and GL-65 high-alumina bricks were used for the hearth. The disadvantages are: low strength, poor high-temperature performance, and weak impermeability. Investigations and studies of blast furnaces at home and abroad show that most of the blast furnaces are forced to shut down due to severe corrosion of the furnace bottom and hearth. With the large-scale, high wind temperature and high-intensity smelting of modern blast furnaces, the working conditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/185
Inventor 刘伟蔡国庆李文亮王希波秦建涛翟勇付卫李慧文翟红军王红艳
Owner SHANDONG REFRACTORIES GRP LUNAI KILN REFRACTORYCO
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