Longevous mullite brick for hot blast stove and preparation method thereof

A mullite brick and hot blast stove technology, applied in the field of refractory materials, can solve the problems of brick vault, poor creep resistance, damage, etc.

Inactive Publication Date: 2014-03-12
郑州市才华耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because when ordinary high-alumina bricks are used in the high-temperature zone of most hot blast stoves, the upper checker bricks have different degrees of erosion, that is, "slag", which causes the holes of the checker bricks to be blocked; however, the checker bricks in the high-temperature zone also withstand The load on the upper checker bricks mainly causes checker bricks to collapse due to uneven subsidence due to creep; and the main phenomenon of damage to the top of the hot blast stove and the three-fork of the pipeline is also caused by poor high-temperature creep resistance. The phenomenon of falling bricks and cracking of the vault
The above-mentioned defects also exist in the use of pure homogeneous sintered mullite bricks, because pure homogeneous sintered mullite bricks have good creep resistance when the temperature is 1300 ° C and below, but when the creep temperature is greater than 1300 ° C, the performance poor creep resistance

Method used

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  • Longevous mullite brick for hot blast stove and preparation method thereof
  • Longevous mullite brick for hot blast stove and preparation method thereof
  • Longevous mullite brick for hot blast stove and preparation method thereof

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preparation example Construction

[0029] A method for preparing long-lived mullite bricks for hot blast stoves, comprising the following steps: a. Weighing the following preparation raw materials in mass percentages: containing Al 2 o 3 The mass percentage is 75%-95% of mullite of 70%-80%, 0%-20% of sillimanite, and 4%-6% of Guangxi white mud; 2-4% lignin; add water and mix to make adobe; b. drying; c. firing: the winding temperature is 1380°C-1480°C, and the optimal sintering temperature is 1430°C.

[0030] The mullite of the present invention is a high-alumina vanadium clay clinker homogenized material, wherein the mullite has a large particle size of 1-3 mm, a medium particle size of 0.075-1 mm and a fine powder fineness of ≤0.074 mm in a mass ratio of 4:2:1.5-3.5 It is obtained by mixing, the particle size of sillimanite is 0-0.2mm, and the particle size of white clay is 0.070-0.088mm.

[0031] The present invention uses Al in mullite 2 o 3 The mass percentage is 75% as an example for illustration.

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Embodiment 4

[0070] Embodiment 4 organizational structure

[0071] Figure 8 A scanning electron microscope image of Example 4 (no sillimanite added) is given. It can be seen from the microstructure diagram that Example 4 has a denser structure and lower porosity. It can be seen from the energy spectrum and analysis results that almost all of them are mullite structures, which also confirms its high compressive strength macroscopically.

[0072] Figure 9 The scanning electron microscope picture of Example 5 (the addition of sillimanite is 10%) is given. From the energy spectrum and analysis results, it can be seen that there is a little corundum phase in the sample. The reason may be that the raw material has not been completely homogenized, and some corundum is contained in addition to mullite, so the corundum is introduced into the sample through the raw material. middle.

[0073] Figure 10 The scanning electron micrograph of sample example 6 (the addition of sillimanite is 20%...

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Abstract

The invention discloses a longevous mullite brick for a hot blast stove. The brick is prepared from the following raw materials in percentage by weight: 75-95% of mullite containing 70-80wt% of Al2O3, 0-20% of sillimanite and 4-6% of Guangxi white mud, and further comprises 2-4% of lignin based on total weight of the above three raw materials. The preparation method comprises the following steps: a, weighing the raw materials in proportion, and adding water, mixing and stirring to prepare a green brick; b, drying; and c, firing: the sintering temperature is 1380-1480 DEG C. The sillimanite is added into the mullite, so that the creep resistance of the brick can be remarkably improved. Particularly, the sillimanite is mullitized under a condition of a high temperature over 1400 DEG C and accompanies volume expansion, the expansion just can offset or partially offset contraction generated in the high-temperature using process, so that the material has good creep resistance.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a mullite refractory brick for a hot blast stove. Background technique [0002] The iron and steel industry occupies an important position in the national economy, and blast furnaces and hot blast stoves are the most important equipment in the ironmaking industry. The service life of blast furnaces and hot blast stoves in advanced foreign countries can reach 15-20 years, but in my country it is only about 8 years. To achieve longevity, refractory materials are one of the key factors. [0003] With the advancement of smelting technology in recent years, high blast temperature technology is generally used in hot blast stoves, and the service life of hot blast stoves is required to be longer, so there are further requirements for the performance of refractory materials. High alumina bricks are mostly used in hot blast stoves, and the high temperature and high pressu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 崔全掌任建国范晓凯陈海萍王富军郭红旭王松红
Owner 郑州市才华耐火材料有限公司
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