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Microporous lightweight corundum refractory aggregate and preparation method thereof

A refractory aggregate and lightweight technology, which is applied in the field of microporous lightweight corundum refractory aggregate and its preparation, can solve the problems of erosion resistance and erosion resistance, as well as poor strength and wear resistance, and achieve erosion resistance and erosion resistance. Strong, simple production process, low apparent porosity

Inactive Publication Date: 2014-06-25
JIANGSU JINGXIN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional thermal insulation refractory materials have excellent thermal insulation effect, but their erosion resistance, erosion resistance, strength and wear resistance are poor. Usually, they cannot be used directly as a working surface, but as an insulation layer or a permanent layer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A microporous lightweight corundum refractory aggregate and a preparation method thereof. The raw materials and mass percentages of the microporous lightweight corundum refractory aggregate are: 90~98wt% industrial alumina fine powder, 0~5wt%α-Al 2 o 3 Micropowder, 0.01~1wt% aluminum powder, 1~5wt% wood chips;

[0020] Grinding in a circular flow mill, forming into balls in a horizontal ball forming machine, the size of the ball blank is 25-30mm, and then quickly fired and cooled in a shaft kiln under the condition of 1800~1950°C, and the fired product is crushed After that, the microporous lightweight corundum refractory aggregate can be obtained.

[0021] The bulk density of the microporous lightweight corundum refractory aggregate prepared in this example is between 3.2 and 3.4 g / cm 3 , the apparent porosity is 2~3%, and the average pore diameter is 0.5~1μm.

Embodiment 2

[0023] A microporous lightweight corundum refractory aggregate and a preparation method thereof. The raw materials and mass percentages of the microporous lightweight corundum refractory aggregate are: 90~98wt% industrial alumina fine powder, 0~5wt% industrial aluminum hydroxide fine powder, 0.01~1wt% aluminum fluoride, 1~5 wt% sawdust;

[0024] Grinding by dry method in the ring flow mill, forming into balls in the horizontal ball forming machine, the size of the ball blank is 25-30mm, and then burning and cooling rapidly in the shaft kiln under the condition of 1800~1950 ℃, and the fired product is crushed After that, the microporous lightweight corundum refractory aggregate can be obtained.

[0025] The bulk density of the microporous lightweight corundum refractory aggregate prepared in this example is between 2.8 and 3.0 g / cm 3 , the apparent porosity is 3~4%, and the average pore diameter is 1~2μm.

Embodiment 3

[0027] A microporous lightweight corundum refractory aggregate and a preparation method thereof. The raw materials and mass percentages of the microporous lightweight corundum refractory aggregate are: 85~99wt% industrial alumina fine powder, 0~10wt% industrial aluminum hydroxide fine powder, 0~10wt% α-Al 2 o 3 Micropowder, 1~5 wt% carbon black;

[0028] Grinding by dry method in the ring flow mill, forming into balls in the horizontal ball forming machine, the size of the ball blank is 25-30mm, and then burning and cooling rapidly in the shaft kiln under the condition of 1800~1950 ℃, and the fired product is crushed After that, the microporous lightweight corundum refractory aggregate can be obtained.

[0029] The bulk density of the microporous lightweight corundum refractory aggregate prepared in this example is between 2.9 and 3.1 g / cm 3 , the apparent porosity is 2~4%, and the average pore diameter is 0.5~1μm.

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Abstract

The invention relates to a microporous lightweight corundum refractory aggregate and a preparation method thereof. The technical scheme is as follows: the microporous lightweight corundum refractory aggregate is prepared from the following raw materials by mass percent: 80-99wt% of commercial alumina fine powder, 0-25wt% of commercial aluminum hydroxide fine powder or alpha-Al2O3 micro powder, 0-5wt% of metal aluminum powder, aluminum fluoride, or aluminum nitrate aluminum salt which is taken as a mineralizer, and 1-10wt% of saw dust, lignin or carbon black serving as a pore increasing agent. The preparation method comprises steps of continuously grinding the raw materials according to the proportion in a circle flow ball mill, obtaining uniformly mixed qualified powder material with median diameter of 2-8mu m step-by-step through 2-5 grade of winnowing, balling in a horizontal or disc type ball forming mill, drying, then rapidly firing in a shaft kiln at 1800-1950DEG C, and crushing so as to obtain the microporous lightweight corundum aggregate. The microporous lightweight corundum aggregate has a simple and convenient production technology, is applicable to large-scale industrial production, and has advantages of small pore diameter, high strength, low heat conductivity, scouring resistance and corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of corundum refractory materials. Specifically relates to a microporous lightweight corundum refractory aggregate and a preparation method thereof. Background technique [0002] The technological progress of refractory materials and the development of high-temperature industry influence and promote each other. Refractory materials are not only consumable materials for modern high-temperature technology, but also functional materials necessary to realize high-temperature new technologies. About 70% of the refractory materials are used for iron and steel smelting, but compared with the international advanced level, the energy consumption per ton of steel for iron and steel smelting in my country is 20-40% higher, and the consumption of refractory materials per ton of steel is far behind that of developed countries in the world. [0003] In the process of iron and steel smelting, the ladle is an important ...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 李正坤张家勤谈福桂
Owner JIANGSU JINGXIN NEW MATERIAL
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