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High-performance magnesia carbon brick and preparation method thereof

A magnesia-carbon brick and high-performance technology, which is applied in the field of magnesia-carbon brick processing, can solve the problems of large thermal expansion coefficient, affect performance, and large expansion coefficient, and achieve the effects of improving corrosion resistance, reducing thermal shock damage and improving performance.

Active Publication Date: 2018-11-23
上海新泰山高温工程材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the prior art, the alkaline high-melting point oxide-high-grade fused magnesia added to the magnesia-carbon brick has a large thermal expansion coefficient. Cracking, which will affect the actual performance

Method used

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  • High-performance magnesia carbon brick and preparation method thereof
  • High-performance magnesia carbon brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Mixing: first add the fused magnesia particles to the mixer for dry mixing for 4 minutes, then slowly add the binder and mix for 4 minutes, then add flake graphite and mix for 8 minutes, and finally add fused magnesia fine powder, metal Aluminum powder and spinel-calcium aluminate composite material were mixed for 35 minutes and discharged;

[0038] (2) Molding: Add the mud material that has been kneaded into the mold and press it to form a semi-finished brick adobe, with a pressure of 6300KN;

[0039] (3) Baking: put the pressed semi-finished brick adobe into a drying kiln to bake and solidify, the baking temperature is 200°C, and the baking time is 16 hours;

[0040] In this example, according to the mass parts, the proportion of each component is 60 parts of fused magnesia particles, and the fused magnesia particles are three kinds of particles of 3mm, 1mm, and 0.075mm mixed in a mass ratio of 3:3:2 Formed, the mass percentage of chemical composition is MgO≧96.5...

Embodiment 2

[0047] (1) Mixing: first add the fused magnesia particles to the mixer for dry mixing for 5 minutes, then slowly add the binder and mix for 5 minutes, then add flake graphite and mix for 10 minutes, and finally add fused magnesia fine powder, metal Aluminum powder and spinel-calcium aluminate composite material were mixed for 30 minutes and discharged;

[0048] (2) Forming: Add the mixed mud material into the mold and press it into a semi-finished brick adobe, with a pressure of 10000KN;

[0049] (3) Baking: put the pressed semi-finished brick adobe into a drying kiln to bake and solidify, the baking temperature is 180°C, and the baking time is 24h;

[0050] In this embodiment, according to the mass parts, the proportion of each component is 75 parts of fused magnesia particles, and the fused magnesia particles are three kinds of particles of 5mm, 3mm and 1mm mixed with a mass ratio of 5:5:4. Composition, the mass percentage of chemical composition is MgO≧96.5%, CaO2 3 ;

[...

Embodiment 3

[0057] (1) Mixing: first add the fused magnesia particles to the mixer for dry mixing for 5 minutes, then slowly add the binder and mix for 5 minutes, then add flake graphite and mix for 10 minutes, and finally add fused magnesia fine powder, metal Aluminum powder and spinel-calcium aluminate composite material were mixed for 40 minutes and discharged;

[0058] (2) Molding: Add the mud material that has been kneaded into the mold and press it into a semi-finished brick adobe, with a pressure of 7000KN;

[0059] (3) Baking: put the pressed semi-finished brick adobe into a drying kiln to bake and solidify, the baking temperature is 250°C, and the baking time is 12 hours;

[0060] In this embodiment, according to the mass parts, the proportion of each component is 70 parts of fused magnesia particles, and the fused magnesia particles are three kinds of particles of 5mm, 3mm and 1mm mixed with a mass ratio of 5:5:4. Composition, the mass percentage of chemical composition is MgO≧...

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Abstract

The invention provides a high-performance magnesia carbon brick and a preparation method thereof. The high-performance magnesia carbon brick is mainly prepared from the following raw materials in parts by mass: 60-75 parts of fused magnesite particles, 10-25 parts of 120-400-mesh fused magnesite fine powder, 1-5 parts of aluminum powder, 0.1-5 parts of a spinel-calcium aluminate multiphase material, 10-16 parts of crystalline flake graphite and 2-4 parts of a binding agent, wherein the fused magnesite particles are prepared by mixing three kinds of particles with the particle size of 3-5 mm, 1-3 mm and 0.075-1 mm according to the mass ratio of (3-5):(3-5):(2-4). According to the magnesia carbon brick, the spinel-calcium aluminate multiphase material is introduced, so that a low-melting-point substance is generated on the surface of the magnesia carbon brick at a high temperature, thermal stress is relieved, thermal shock damage and mechanical damage are reduced, and therefore the purpose of preventing the magnesia carbon brick from cracking is achieved.

Description

technical field [0001] The invention relates to the field of magnesia-carbon brick processing, in particular to a high-performance magnesia-carbon brick and a preparation method thereof. Background technique [0002] Magnesia carbon brick is a carbon-containing composite refractory material. It was first used in 1970 and gradually put into use. It is still used today for long-term optimization and improvement. The main components of magnesia carbon bricks are alkaline high melting point oxides, MgO and high melting point carbon materials that are insoluble in water, insoluble in organic solvents, and non-wetting with high temperature slag - flake graphite as the main raw material, supplemented by various antioxidants Additives, processed under the action of organic binders. [0003] Due to the high resistance to slag intrusion, high thermal shock resistance, high spalling resistance and not easily wetted by slag and molten steel, magnesia carbon bricks have been widely used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/043C04B35/634
CPCC04B35/043C04B35/63476C04B2235/3222C04B2235/402C04B2235/425C04B2235/77C04B2235/96
Inventor 马四凯李洪波魏振国邹新国李维锋
Owner 上海新泰山高温工程材料有限公司
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