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Preparation method for magnetism-containing modified corundum composite material

A corundum and modification technology, which is applied in the field of preparation of magnesium-containing modified corundum composite materials, can solve problems such as lattice defects, affecting the service performance of refractory materials, and the excellent performance of corundum spinel composite materials cannot be fully utilized. Achieve the effects of increased density, reduced over-crushing, and adjustable product fineness

Inactive Publication Date: 2015-03-25
JIANGSU JINGXIN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some shortcomings in the preparation of the composite material. The composite material is usually introduced as an aggregate with corundum and spinel as independent materials, and 5-10% of synthetic spinel or 3-5% of sintered magnesia is usually introduced into the base material. After sintering, the corundum-spinel complex only exists in the middle of the independent crystals of corundum or spinel, and the lattice defects caused by the in-situ reaction form many microcracks on the crystal surface and between crystals, which affect the refractory materials. The service performance at high temperature prevents the excellent performance of the corundum spinel composite material from being fully utilized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A magnesium-containing modified corundum composite material and a preparation method thereof. The raw materials and mass percentages of the magnesium-containing modified corundum composite material are: 80-90wt% industrial alumina, 0-10% calcined alumina, 0-5% dead-burned magnesia, and 0.5-5% Aluminum sol is used as a binder or a burning agent;

[0017] Uniformly mixed and finely ground in a ball mill, air-selected and classified, formed into balls in a horizontal ball forming machine, the size of the ball blank is 25-30mm, and then fired rapidly in a vertical kiln at 1700~1950°C and cooled rapidly. After the final product is crushed, the magnesium-containing modified corundum composite material product can be obtained.

[0018] The bulk density of the magnesium-containing modified corundum composite material prepared in this example is between 3.45 and 3.55 g / cm 3 .

Embodiment 2

[0020] A magnesium-containing modified corundum composite material and a preparation method thereof. The raw materials and mass percentages of the magnesium-containing modified corundum composite material are: 85-100wt% industrial alumina, 5-10wt% industrial aluminum hydroxide, 5-10% magnesite, 1-3% aluminum sol ;

[0021] Grind in a circular flow mill, form into balls in a horizontal ball forming machine, the size of the ball is 25-30mm, and then quickly burn in a shaft kiln at 1850~1950°C and cool quickly, and the fired product is crushed After that, the magnesium-containing modified corundum composite material can be obtained.

[0022] The bulk density of the magnesium-containing modified corundum composite material prepared in this example is between 3.45 and 3.50 g / cm 3 .

Embodiment 3

[0024] A magnesium-containing modified corundum composite material and a preparation method thereof. The raw materials and mass percentages of the magnesium-containing modified corundum composite material are: 90-100wt% industrial alumina, 0-5wt% calcined alumina, and 3-5% calcined brucite.

[0025] 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 vertical kiln under the condition of 1800~1900°C, and the fired product is crushed After that, the magnesium-containing modified corundum composite material can be obtained.

[0026] The bulk density of the magnesium-containing modified corundum composite material prepared in this example is between 3.5 and 3.55 g / cm 3 .

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Abstract

The invention relates to a preparation method for a magnetism-containing modified corundum composite material. The composite material comprises the following main chemical components (wt): more than 95% of Al2O3 and less than 5% of MgO (Al2O3+MgO>99%); a main phase is a spinel-corundum phase. The preparation method comprises the following steps: taking industrial Al2O3, alpha-Al2O3 and Al(OH)3 as aluminum sources and magnesium salts such as brucite, light-burned MgO, dead burnt magnesite and magnesite as magnesium sources, adding 0.5-5% of alumina sol as a bonding agent or a combustion supporting agent, uniformly mixing through a gap-type or continuous-type ball mill, finely grinding, grading powder through air separation, forming the powder through a process of balling, pressing or the like, finally quickly sintering in a vertical kiln or a rotary kiln at 1,700-1,950 DEG C, crushing, grading, and deironing to obtain the magnetism-containing modified corundum composite material. According to the method, a high-quality refractory material for a liner of a high-temperature kiln is obtained, is low in expansion, high in strength, good in stability in a high-temperature reduction atmosphere and good in alkali resistance and slag corrosion resistance, and is a conventional sintered corundum upgrade product.

Description

technical field [0001] The invention belongs to the technical field of corundum refractory materials, and in particular relates to a preparation method of a magnesium-containing modified corundum composite material. Background technique [0002] The technological progress of refractory materials and the development of high-temperature industry influence and promote each other. For modern high-temperature technology, they are not only consumable materials, but also functional materials necessary for the realization of high-temperature new technologies. my country is a big steel producing country in the world, but the quality of high-quality special steel is not as good as that of developed countries in the world. Therefore, improving the anti-erosion, anti-scouring and anti-permeation properties of refractory materials and reducing the consumption of refractory materials has been a long-term research topic for experts. [0003] With the development of out-of-furnace refining ...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
Inventor 李正坤张家勤李寅吕戍生张嘉良
Owner JIANGSU JINGXIN NEW MATERIAL
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