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Low-carbon magnesia carbon brick and preparation method thereof

A technology of carbon-magnesia-carbon bricks and magnesia-carbon bricks, applied in the field of low-carbon magnesia-carbon bricks and their preparation, to achieve the effects of improving heat insulation, improving thermal shock resistance, and reducing thermal stress concentration

Inactive Publication Date: 2020-12-18
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of low-carbon magnesia-carbon bricks to solve the defects existing in the application of low-carbon magnesia-carbon bricks

Method used

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  • Low-carbon magnesia carbon brick and preparation method thereof
  • Low-carbon magnesia carbon brick and preparation method thereof
  • Low-carbon magnesia carbon brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Ingredients: 93% of carbon-coated magnesium oxide particles (58% for aggregates of 5mm to 0.088mm, 35% for fine powders less than 0.088mm, and the thickness of the carbon layer is about 15nm), 3% of additives (aluminum powder 2%, silicon powder 1%), liquid phenolic resin 4%.

[0027] (2) Mixing: add the raw materials in (1) in sequence according to the order of aggregate, resin, fine powder, and additives, and fully mix and grind.

[0028] (3) Compression molding and drying, the raw materials mixed and milled in (2) are compressed into molding and dried to obtain finished products.

[0029] Depend on figure 1 (a. magnesia raw material; b. magnesia after carbon coating; c. carbon shell) shows that the carbon-coated magnesia particles prepared in this example maintain the basic morphology of the raw material, and the hydrochloric acid The residue after treatment is a hollow carbon shell, which is consistent with the morphology of the raw magnesium oxide particles, i...

Embodiment 2

[0042] (1) Ingredients: 58% magnesium oxide aggregate particles, 35% carbon-coated magnesium oxide fine powder particles (the thickness of the carbon layer is about 10nm), 3% additives (2% aluminum powder, 1% silicon powder), Liquid phenolic resin 4%.

[0043] (2) Mixing: add the raw materials in (1) in sequence according to the order of aggregate, resin, fine powder, and additives, and fully mix and grind.

[0044] (3) Compression molding and drying, the raw materials mixed and milled in (2) are compressed into molding and dried to obtain finished products.

[0045] After testing, the parameters of the low-carbon magnesia-carbon bricks produced are as follows: the carbon content is 2.4%, the apparent porosity is 5.6%, and the bulk density is 3.10g / cm 3 The compressive strength at room temperature is 80MPa; the flexural strength at room temperature is 36MPa; the thermal shock resistance is expressed by the number of times the sample can withstand the air quenching after heat tr...

Embodiment 3

[0047] (1) Ingredients: 58% magnesium oxide aggregate particles, 17.5% magnesium oxide fine powder particles, 17.5% carbon-coated magnesium oxide fine powder particles (the carbon layer thickness is about 25nm), 3% additives (aluminum powder 2%, silicon powder 1%), liquid phenolic resin 4%.

[0048] (2) Mixing: add the raw materials in (1) in sequence according to the order of aggregate, resin, fine powder, and additives, and fully mix and grind.

[0049] (3) Compression molding and drying, the raw materials mixed and milled in (2) are compressed into molding and dried to obtain finished products.

[0050] After testing, the parameters of the low-carbon magnesia-carbon bricks produced are as follows: the carbon content is 2.5%, the apparent porosity is 5.9%, and the bulk density is 3.09g / cm 3 The compressive strength at room temperature is 88MPa; the flexural strength at room temperature is 38MPa; the thermal shock resistance is expressed by the number of times the sample can...

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Abstract

The invention provides a high-performance low-carbon magnesia carbon brick and a preparation method thereof. The low-carbon magnesia carbon brick is obtained by mixing and molding a carbon-coated magnesium oxide raw material. The low-carbon magnesia carbon brick prepared by the method can be added with less or no graphite, has good thermal shock resistance and slag resistance, and can be widely applied to smelting of high-quality clean steel and ultra-low carbon steel.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a low-carbon magnesia-carbon brick and a preparation method thereof. Background technique [0002] Magnesia carbon brick ("MgO-C brick") is a refractory material composed of magnesia and carbon as the main raw materials. It is widely used in electric furnaces, refining furnace linings and ladle slag lines. Its performance has a great influence on the smelting process and product quality. Significant influence. At present, the main preparation method of magnesia-carbon bricks is to add graphite, additives and binders to magnesia, and then press molding, in which the carbon content is generally 10-20%. Traditional magnesia-carbon bricks have the following problems in the actual application process: (1) When smelting high-quality clean steel and ultra-low carbon steel, it will cause the problem of carburization of molten steel; (2) High carbon content leads to high thermal condu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/04C04B35/66C04B35/628
CPCC04B35/04C04B35/66C04B35/6281C04B35/62897C04B2235/422C04B2235/425C04B2235/428C04B2235/402C04B2235/96C04B2235/77C04B2235/9607
Inventor 霍开富高标陈振东付继江李忠红
Owner WUHAN UNIV OF SCI & TECH
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