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Light-weight magnesia brick and preparation method thereof

A magnesia brick and light-weight technology, applied in the field of light-weight magnesia brick and its preparation, can solve the problems of difficulty in meeting the requirements of lightweight materials, large bulk density of magnesia bricks, waste of energy, etc. The effect of reducing weight loss and reducing heat loss

Inactive Publication Date: 2012-11-28
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing magnesia bricks have a large volume density and a large weight. The preparation process not only wastes energy, but also is difficult to meet the requirements of lightweight materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A light-weight magnesia brick and a preparation method thereof. Stir 60~85wt% sintered magnesia particles, 10~35wt% magnesite particles, 2~4wt% silica fine powder, 1~2wt% soft clay and 2~3wt% binder Uniform, pressed and formed, dried naturally for 24 hours, then kept at 110-150°C for 8-12 hours, and then fired at 1350-1400°C for 9-12 hours to obtain magnesia bricks.

Embodiment 2

[0027] A light-weight magnesia brick and a preparation method thereof. First, 45~50wt% sintered magnesia particles, 45~50wt% magnesite fine powder, 2~4wt% silica fine powder, 1~2wt% soft clay and 1~2wt% binder Stir evenly, press into shape, dry naturally for 24 hours, keep warm at 110-200°C for 8-12 hours, and then fire at 1350-1400°C for 3-6 hours to obtain magnesia bricks.

Embodiment 3

[0029] A light-weight magnesia brick and a preparation method thereof. First, 15~20wt% sintered magnesia particles, 30~40wt% sintered magnesia fine powder, 35~50wt% magnesite particles, 0.5~2wt% silica fine powder, 0.5~1wt% soft Stir clay and 2~3wt% binder evenly, press into shape, dry naturally for 24 hours, keep warm at 250~300°C for 12~18 hours, and then burn at 1350~1400°C for 9~12 hours, Made magnesia bricks.

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PUM

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Abstract

The invention relates to a light-weight magnesia brick and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: uniformly mixing 30-85 wt% of sintered magnesia, 10-65 wt% of magnesite, 0.5-4 wt% of silicon dioxide fine powder, 0.5-2% of soft clay and 1-3% of binder, carrying out press forming, naturally drying for 24 hours, keeping the temperature of 110-300 DEG C for 8-24 hours, and firing at 1350-1500 DEG C for 3-12 hours to obtain the magnesia brick. The sintered magnesia is granules, fine powder or mixture of granules and fine powder; and the magnesite is granules, fine powder or mixture of granules and fine powder. The light-weight magnesia brick has the advantages of low volume density, low heat conductivity, moderate strength, strong alkaline slag corrosion resistance, high heat-insulating property and high melting point, is beneficial to energy saving and consumption reduction, and satisfies the light-weight requirement of the material. The invention is suitable for the liner of a high-temperature industrial kiln and container.

Description

technical field [0001] The invention belongs to the technical field of magnesia refractories. In particular, it relates to a light-weight magnesia brick and a preparation method thereof. Background technique [0002] Energy saving and consumption reduction is one of the main contents of the current national science and technology development planning outline, and it is also an important issue faced by high temperature industry for a long time. Magnesia bricks have a series of advantages such as good wear resistance, strong resistance to alkaline slag erosion, large heat capacity and high strength, and can be used as lining materials for high-temperature industrial kilns and containers. [0003] Existing magnesia bricks usually use sintered magnesia as the main raw material, use pulp waste liquid as the binder for stirring and molding, and then fire at high temperature. But this kind of magnesia brick has a higher volume density and a heavier weight after it is produced. ...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 魏耀武李楠柯昌明鄢文韩兵强李友胜
Owner WUHAN UNIV OF SCI & TECH
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