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A kind of high performance magnesia carbon brick and preparation method thereof

A high-performance technology for magnesia-carbon bricks, applied in the field of magnesia-carbon brick processing, can solve problems affecting performance, large thermal expansion coefficient, and large expansion coefficient, and achieve the effects of reducing thermal shock damage, alleviating thermal stress, and improving performance

Active Publication Date: 2021-09-21
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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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 mixed mud into the mold and press it into a semi-finished adobe, with a pressure of 6300kN;

[0039] (3) Baking: Put the pressed semi-finished bricks 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%, CaO2 3 ;

[0041] Fused magnesia fin...

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) Molding: Add the mixed mud into the mold and press it into a semi-finished adobe, with a pressure of 10000kN;

[0049] (3) Baking: Put the pressed semi-finished bricks into a drying kiln to bake and solidify. The baking temperature is 180°C and the baking time is 24 hours;

[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 ;

[0051] Fused magn...

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 mixed mud into the mold and press it into a semi-finished adobe, with a pressure of 7000kN;

[0059] (3) Baking: Put the pressed semi-finished bricks 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≥96.5%, CaO2 3 ;

[0061] Fused magne...

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Abstract

The invention provides a high-performance magnesia-carbon brick and a preparation method thereof, mainly comprising the following raw materials in parts by mass: 60-75 parts of fused magnesia particles, 10-25 parts of fused magnesia fine powder of 120 mesh-400 mesh , 1-5 parts of aluminum powder, 0.1-5 parts of spinel-calcium aluminate composite material, 10-16 parts of flake graphite, 2-4 parts of binding agent; the fused magnesia particles are 3-5mm, 1 ‑3mm and 0.075‑1mm particles are mixed in mass ratio (3‑5): (3‑5): (2‑4). The magnesia-carbon brick of the embodiment of the present invention introduces a spinel-calcium aluminate composite material, thereby producing low-melting-point substances on the surface of the magnesia-carbon brick at high temperature, relieving thermal stress, reducing thermal shock damage and mechanical damage, thereby achieving The purpose of preventing cracking of the magnesia carbon brick body.

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—flaky 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 Patents(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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