Composite magnesia carbon brick and preparation method thereof

A technology of composite magnesia-carbon bricks and magnesia-carbon bricks, which is applied in the field of refractory materials, can solve problems such as weak oxidation resistance and undisclosed apparent porosity of magnesia-carbon bricks, and achieve parameters such as improvement, pressure/bending resistance improvement, and improvement The effect of bulk density

Inactive Publication Date: 2020-11-13
LIAONING DONGHE NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the above method uses waste magnesia bricks for reproduction, the apparent porosity of the produced magnesia-carbon bricks has not been disclosed. After testing, the apparent porosity of the prepared magnesia-carbon bricks is as high as 8%, and the oxidation resistance is weak.

Method used

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  • Composite magnesia carbon brick and preparation method thereof
  • Composite magnesia carbon brick and preparation method thereof
  • Composite magnesia carbon brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The composite magnesia-carbon brick of the present embodiment includes the following raw materials in parts by weight:

[0043] Waste magnesia carbon brick: 25 parts, specifications: MgO95%, SiO 2 Content ≤ 2.0%, apparent porosity ≤ 25%, moisture ≤ 0.5%,

[0044] Magnesia: 75 parts, purity: 99%,

[0045] Graphite: 5 parts, the carbon content of the graphite is >95%, and the water content is ≤0.5%,

[0046] Alabaster: 10 parts, moisture ≤0.5%,

[0047]Slag powder: 6 parts, moisture ≤0.5%,

[0048] Phenolic resin; 5 parts, solid content ≥ 90%,

[0049] Epoxy resin: 1 part, solid content ≥ 90%,

[0050] Furan resin: 2 parts, solid content ≥ 90%,

[0051] Polyvinylpyrrolidone: 1 part, purity: 95%,

[0052] Additives: 2 parts;

[0053] Wherein the additives include SiC-Al 2 o 3 Composite powder, zirconia powder, potassium sulfate powder and bentonite,

[0054] The SiC-Al 2 o 3 The weight ratio among the composite powder, the zirconia powder, the potassium sulfat...

Embodiment 2

[0069] Present embodiment is basically the same as embodiment 1, and difference is:

[0070] The composite magnesia carbon brick includes the following raw materials in parts by weight:

[0071] Waste magnesia carbon brick: 35 parts,

[0072] Magnesia: 65 parts,

[0073] Graphite: 10 parts,

[0074] Alabaster: 5 parts,

[0075] Slag powder: 8 parts,

[0076] phenolic resin; 3 parts,

[0077] Epoxy resin: 2 parts,

[0078] Furan resin: 1 part,

[0079] Polyvinylpyrrolidone: 2 parts,

[0080] Additives: 1 part.

Embodiment 3

[0082] Present embodiment is basically the same as embodiment 1, and difference is:

[0083] The composite magnesia-carbon brick includes the following raw materials in parts by weight: waste magnesia-carbon brick: 30 parts,

[0084] Magnesia: 70 parts,

[0085] Graphite: 8 parts,

[0086] Alabaster: 8 parts,

[0087] Slag powder: 7 parts,

[0088] phenolic resin; 3 parts,

[0089] Epoxy resin: 2 parts,

[0090] Furan resin: 1 part,

[0091] Polyvinylpyrrolidone: 2 parts,

[0092] Additives: 2 parts.

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Abstract

The invention discloses a composite magnesia carbon brick and a preparation method thereof, and belongs to the technical field of refractory materials. The composite magnesia carbon brick comprises the following raw materials: waste magnesia carbon bricks, magnesia, graphite, wax stone, slag powder, phenolic resin, epoxy resin, furan resin, polyvinylpyrrolidone, additives and the like. The preparation method comprises the following steps: (1) treatment of the waste magnesia carbon bricks: firstly, carrying out a coarse treatment and secondary treatment on the waste magnesia carbon bricks; (2)mixing: mixing the raw materials in sequence; (3) molding: pouring the mixed material into a mold, and carrying out compression molding by using a brick press to obtain a green brick; and (4) heat treatment: placing the formed green brick in a drying kiln for curing, and curing to obtain a finished product. Compared with the prior art, the prepared magnesia carbon brick has good performance advantages, and the apparent porosity, the volume density, the normal-temperature compressive strength, the normal-temperature flexural strength, the high-temperature flexural strength, the linear expansionrate and other test parameters show significant differences.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a composite magnesia-carbon brick and a preparation method thereof. Background technique [0002] Magnesia carbon brick is a composite refractory material composed of magnesia, graphite, resin, etc. as the main raw materials. It is a high-quality refractory material. At present, it is widely used in the lining of industrial furnaces such as converters, ladles, electric furnaces and refining furnaces. The oxidation resistance of magnesia carbon bricks is one of the important symbols to measure the quality of products. In a sense, the apparent porosity can more intuitively reflect the oxidation resistance of magnesia carbon bricks. [0003] With the continuous development of the iron and steel industry, the requirements for the performance of magnesia carbon bricks are also getting higher and higher. Therefore, it is of great significance to study the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/04C04B35/66C04B35/622
CPCC04B35/04C04B35/66C04B35/62204C04B2235/5427C04B2235/5436C04B2235/3244C04B2235/349C04B2235/3201C04B2235/3217C04B2235/3826C04B2235/425C04B2235/77C04B2235/96C04B2235/9607C04B2235/9615
Inventor 毕胜民毕一明董宝华孙希忠赵权秦楠钟刚王飞王耶贾明鑫赵蔚
Owner LIAONING DONGHE NEW MATERIAL CO LTD
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