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Lightweight calcium hexaluminate-magnesia alumina spinel composite microporous refractory aggregate and preparation method thereof

A technology of magnesium aluminum spinel and calcium hexaaluminate is applied to calcium hexaaluminate-magnesium aluminum spinel composite microporous refractory aggregate and preparation, and the field of refractory aggregate can solve the problem of reducing the thermal insulation effect of refractory materials. , The thermal conductivity of refractory materials is increased, and the loss of heat energy is increased, so as to achieve the effect of high strength, less impurity components, and small pore diameter.

Inactive Publication Date: 2013-03-13
HENAN UNIV OF SCI & TECH
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used refractories are mainly Al 2 o 3 -SiO 2 However, when such refractory materials are used in the petrochemical industry, due to the influence of reducing atmosphere or alkaline environment, the damage of refractory materials will be aggravated, thereby reducing the service life of materials
In addition, due to the large size of pores in traditional lightweight refractory castables, the pore size is mostly on the millimeter level, so when the material is used in a high temperature environment, due to the intensification of radiation heat transfer and convective heat transfer, the heat conduction of the refractory material will be reduced. The coefficient increases, which in turn reduces the heat insulation effect of the refractory material, increases the loss of heat energy, and increases the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Grind lime and magnesite into fine powder with a particle size of less than 0.074 μm, and make ingredients according to the weight ratio of 6.4% lime, 14% magnesite and 79.6% industrial aluminum hydroxide. After the above raw materials are weighed, put them into the barrel mill together with the grinding medium corundum balls and water. The ratio of the three is, raw material: grinding medium: water is 1:1:0.6 (weight ratio). The rotating speed of the barrel mill was set at 20r / m, and the co-grinding time was 24h.

[0027] The co-ground mud was trapped in water, and after 24 hours of natural drying, it was dried in a drying kiln at 110°C for 48 hours. The dried mixed material was then dry-milled by a ball mill for 6 hours to obtain a powdered material. Add dextrin solution accounting for 5% of the total weight percentage of the starting material to the powder, and press it with a press under a pressure of 25MPa to form a green body with a size of 230mm×114mm×65mm. Af...

Embodiment 2

[0029] Grind lime and magnesite into fine powder with a particle size of less than 0.074μm, and mix according to the weight ratio of 5.4% lime, 17.5% magnesite and 77.1% industrial aluminum hydroxide. After the above raw materials are weighed, put them into the barrel mill together with the grinding medium corundum balls and water. The ratio of the three is, raw material: grinding medium: water is 1:1:0.8 (weight ratio). The rotating speed of the barrel mill was set at 20r / m, and the co-grinding time was 24h.

[0030] The co-ground mud was trapped in water, dried at room temperature for 24 hours, and then dried in a drying kiln at 150°C for 36 hours. The dried mixed material was then dry-milled by a ball mill for 6 hours to obtain a powdered material. Add dextrin solution accounting for 3% of the total weight percentage of the starting material to the powder, and press it with a press under a pressure of 25MPa to form a green body with a size of 230mm×114mm×65mm. After the ...

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Abstract

The invention discloses a lightweight calcium hexaluminate-magnesia alumina spinel composite microporous refractory aggregate for lightweight refractory castables and a preparation method thereof. The lightweight calcium hexaluminate-magnesia alumina spinel composite microporous refractory aggregate is obtained by taking 3 to 7 weight percent of lime, 12 to 18 weight percent of magnesite and 75 to 85 weight percent of industrial aluminum hydroxide as initiative materials, adding a binding agent in an amount which is 3 to 6 percent of the total weight of the initial materials, performing wet co-grinding and machine molding, drying a green body and then calcining the green body, and crushing a product obtained after calcination. The lightweight microporous aggregate has the advantages of high stability in reducing atmosphere and alkaline environment, excellent thermal shock resistance and thermal insulation property and the like, so that the service life of the material is prolonged and the loss of energy consumption is reduced.

Description

technical field [0001] The invention relates to a refractory aggregate used in the field of refractory materials, in particular to a calcium hexaaluminate-magnesium aluminum spinel composite microporous refractory aggregate for lightweight refractory castables and a preparation method. Background technique [0002] Refractory materials are widely used in metallurgy, petrochemical, glass and other high-temperature industries due to their good corrosion resistance to high-temperature media and their thermal insulation properties. As my country's emphasis on energy saving and consumption reduction continues to increase, more research and development has been done on lightweight refractory materials with good thermal insulation effects. Among them, lightweight refractory castables have received special attention due to their advantages such as convenient construction, low production costs, and good overall structure of the lining. [0003] Lightweight refractory castables can b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 毕玉保周宁生王慧芳
Owner HENAN UNIV OF SCI & TECH
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