Light-weight composite corundum refractory aggregate, and preparation method for light-weight composite corundum refractory aggregate

A technology of refractory aggregate and corundum, which is applied in the field of lightweight corundum composite refractory aggregate and its preparation, can solve the problems of large apparent porosity and pore size, high apparent porosity, reduced aggregate bulk density, etc., and achieves anti-slag resistance. Strong erosion ability, high closed porosity and low bulk density

Active Publication Date: 2015-09-30
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, the currently prepared lightweight refractory aggregates have the defects of high apparent porosity, large average po

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A lightweight corundum composite refractory aggregate and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0035] Step 1, with 80~84wt% γ-Al 2 o 3 Fine powder, 7~10wt% Al(OH) 3 Micropowder, 4-8wt% sugar polymer and 2.5-5wt% antifreeze protein are used as raw materials, and 40-60wt% water is added to the raw materials, and wet milled with a planetary ball mill for 0.5-1.5 hours to prepare slurry I.

[0036] Step 2. Granulate the slurry i into particles with a particle size of 1-2.5mm through discs, and then freeze at -30-60°C for 15-24 hours; then dry at 110-200°C 12 to 36 hours, heat preservation at 300 to 600°C for 4 to 6 hours to obtain porous corundum particles.

[0037] Step 3, with 85~91wt% α-Al 2 o 3Micropowder, 6-10wt% nano-alumina sol and 3-5wt% MgO micropowder are mixed materials, plus 30-40wt% organic alcohol of the mixed material, mixed and wet-milled with a planetary ball mill for 0.1-1 hour...

Embodiment 2

[0042] A lightweight corundum composite refractory aggregate and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0043] Step 1, with 80~84wt% γ-Al 2 o 3 Fine powder, 7~10wt% Al(OH) 3 Micropowder, 4-8wt% sugar polymer and 2.5-5wt% antifreeze protein are used as raw materials, and 40-60wt% water is added to the raw materials, and wet milled with a planetary ball mill for 0.5-1.5 hours to prepare slurry I.

[0044] Step 2: Granulate the slurry i into particles with a particle size of 1-2.5 mm, and freeze at -60-90°C for 6-15 hours; then dry at 110-200°C 12-36 hours, heat preservation at 500-800°C for 3-5 hours to obtain porous corundum particles.

[0045] Step 3, with 91~97wt% α-Al 2 o 3 Micropowder, 2~6wt% nano-alumina sol and 1~3wt% MgO micropowder are mixed materials, and 40~50wt% organic alcohol is added to the mixture, mixed and wet-milled with a planetary ball mill for 0.1~1 hour to obtain a slurry ii.

...

Embodiment 3

[0050] A lightweight corundum composite refractory aggregate and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0051] Step 1, with 84~88wt% γ-Al 2 o 3 Fine powder, 4~8wt% Al(OH) 3 Micropowder, 7-10wt% carbohydrate polymer and 0.1-2.5wt% antifreeze protein are used as raw materials, plus 20-40wt% water of the raw materials, and wet milled with a planetary ball mill for 1.5-3 hours to obtain a slurry Ⅰ .

[0052] Step 2. Granulate the slurry i into particles with a particle size of 1-2.5mm through discs, and then freeze at -30-60°C for 15-24 hours; then dry at 110-200°C 12 to 36 hours, heat preservation at 300 to 600°C for 4 to 6 hours to obtain porous corundum particles.

[0053] Step 3, with 85~91wt% α-Al 2 o 3 Micropowder, 6-10wt% nano-alumina sol and 3-5wt% MgO micropowder are mixed materials, plus 30-40wt% organic alcohol of the mixed material, mixed and wet-milled with a planetary ball mill for 0.1-1 h...

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Abstract

The invention relates to a light-weight composite corundum refractory aggregate, and a preparation method for the light-weight composite corundum refractory aggregate. According to the technical scheme, the preparation method comprises the following steps: taking 80-95 wt% of gamma-Al2O3 fine powder, 1-10 wt% of Al(OH)3 micro powder, 1-10 wt% of a glycopolymer and 0.1-5 wt% of an antifreeze protein as raw materials, adding 20-60 wt% of water, and conducting wet grinding; pelleting slurry obtained after wet grinding into particles with the grain sizes being 1-2.5 mm through a disk, freezing, drying, and keeping the temperature for 3-6 h at the temperature of 300-800 DEG C to obtain porous corundum particles; then taking 80-97 wt% of alpha-Al2O3 micro powder, 2-10 wt% of nanometer aluminium oxide sol, and 1-5 wt% of MgO micro powder as mixtures, adding 30-50 wt% of organic alcohol, and conducting mixed grinding; pelleting the slurry obtained through mixed grinding and the porous corundum particles into particles of which the grain sizes are 3-10 mm, drying, and sintering for 1-5 h at the temperature of 1,700-1,900 DEG C, so as to obtain the light-weight composite corundum refractory aggregate. The light-weight composite corundum refractory aggregate product prepared by the invention is low in volume density, high in closed porosity, and high in slagging corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of corundum refractory aggregate. Specifically relates to a lightweight corundum composite refractory aggregate and a preparation method thereof. Background technique [0002] China is currently the world's second largest energy producer and consumer. The "12th Five-Year Plan for Energy Conservation and Emission Reduction" clearly states that energy-saving transformation of industrial kilns should be vigorously promoted. The research and development of high-temperature lightweight refractory materials can greatly reduce the energy consumption of industrial kilns, which is of great significance to the energy saving and emission reduction of the entire high-temperature industry. [0003] At present, the research on high-temperature lightweight refractory materials is relatively lagging behind, which restricts the development of energy-saving technology for high-temperature kilns in my country to a certain ex...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B38/00C04B35/10
Inventor 顾华志付绿平黄奥张美杰
Owner WUHAN UNIV OF SCI & TECH
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