Anti-erosion magnesia-carbon bricks and preparation method therefor

A magnesia-carbon brick, anti-corrosion technology, applied in the field of refractory materials, can solve problems such as short service life, spallation, and reduced service life of products, and achieve the effects of maintaining dispersion stability, simple process steps, and prolonging service life

Active Publication Date: 2016-12-07
长兴长恒耐火材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Add micropowder additives (any one or more of high-temperature asphalt powder, alumina micropowder, metal aluminum powder, metal silicon powder, metal magnesium powder, boron nitride powder, silicon carbide powder) to the magnesia carbon brick to increase the magnesium The oxidation resistance of carbon bricks at high temperatures has the following shortcomings: (1) Metal micropowder (such as metal aluminum powder, metal silicon powder, etc.) is prone to oxidation, and impurities in oxidized metals and magnesia and graphite are prone to adverse reactions. The reaction will act as a flux during oxidation. As we all know, in fired magnesia bricks, alumina and silicate minerals with a high calcium-silicon ratio can react to form a liquid p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] (1) Preparation of ceramic particles Al 4 SiC 4

[0028] After mixing aluminum powder, silicon powder and carbon powder at a ratio of 4:1:4, add alcohol under nitrogen protection and ball mill in a ball mill for at least 24 hours, sinter in a vacuum hot press sintering furnace at 1600°C for 3 hours, and grind after cooling , Get 5μm ceramic particles Al 4 SiC 4 ,stand-by;

[0029] (2) Preparation of modified phenolic resin

[0030] (a) Dissolving the naphthalenesulfonate formaldehyde polycondensate in ethanol to form a mixed solution with a concentration of 0.5% by mass;

[0031] (b) Add 1% of the mixed solution mass of nano-silica into the mixed solution, and ultrasonically disperse to obtain a dispersion, which is ready for use;

[0032] (c) Press n(phenol): n(formaldehyde)=1:1.25, dissolve phenol in the formaldehyde solution to obtain a premixed solution;

[0033] (d) Press v(dispersion): v(premix)=1:5, add the dispersion to the premix while stirring, and pre...

Example Embodiment

[0037] Example 2

[0038] (1) Preparation of ceramic particles Al 4 SiC 4

[0039] After mixing aluminum powder, silicon powder and carbon powder at a ratio of 4:1:4, add alcohol under nitrogen protection and ball mill in a ball mill for at least 24 hours, sinter in a vacuum hot press sintering furnace at 1800°C for 2 hours, and grind after cooling , Get ceramic particles Al with a particle size of 10μm 4 SiC 4 ,stand-by;

[0040] (2) Preparation of modified phenolic resin

[0041] (a) Dissolving the naphthalene sulfonate formaldehyde polycondensate in ethanol to form a mixed solution with a concentration of 1% by mass;

[0042] (b) Add 1.5% of the mass of the mixed solution of nano-silica into the mixed solution, ultrasonically disperse to obtain a dispersion, and set it aside;

[0043] (c) Press n (phenol): n (formaldehyde) = 1:1.32, dissolve phenol in the formaldehyde solution to obtain a premixed solution;

[0044] (d) Press v (dispersion): v (premix) = 1:6, add the dispersion to the...

Example Embodiment

[0048] Example 3

[0049] (1) Preparation of ceramic particles Al 4 SiC 4

[0050] After mixing the aluminum powder, silicon powder, and carbon powder at a ratio of 4:1:4, add alcohol under the protection of nitrogen to ball mill in a ball mill for at least 24 hours, sinter in a vacuum hot press sintering furnace at 1700°C for 2.5 hours, and cool down Grinding to obtain ceramic particles Al with a particle size of 8μm 4 SiC 4 ,stand-by;

[0051] (2) Preparation of modified phenolic resin

[0052] (a) Dissolving the naphthalene sulfonate formaldehyde polycondensate in ethanol to form a mixed solution with a concentration of 0.7% by mass;

[0053] (b) Add 1.2% of the mixed solution mass of nano-silica into the mixed solution, and ultrasonically disperse to obtain a dispersion, which is ready for use;

[0054] (c) Press n (phenol): n (formaldehyde) = 1:1.28, dissolve phenol in the formaldehyde solution to obtain a premixed solution;

[0055] (d) Press v(dispersion): v(premix)=1:5.5, add the...

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Abstract

The invention discloses anti-erosion magnesia-carbon bricks. The magnesia-carbon bricks are prepared from the following ingredients in parts by weight: 65-70 parts of magnesia, 3-5 parts of basalt granules, 0.25-0.5 part of nano zirconium boride, 1-3 parts of nickel citrate, 1-3 parts of copper sulfate pentahydrate, 0.3-0.5 part of hexamethylene tetramine, 15-18 parts of graphite, 3-5 parts of ceramic granules Al4SiC4 and 3-5 parts of binder. According to the anti-erosion magnesia-carbon bricks, the proportioning of the magnesia-carbon bricks is subjected to optimization and improvement, particularly, the basalt granules, the nano zirconium boride, the nickel citrate, the copper sulfate pentahydrate and the ceramic granules Al4SiC4 are added, and all the ingredients are synergistic mutually, so that the quality of the bricks is high, the carbon loss can be greatly lowered, the spalling of the bricks is avoided, the slag erosion resistance of the magnesia-carbon bricks is improved obviously, and the service lives of the magnesia-carbon bricks are prolonged. The invention further discloses a preparation method for the anti-erosion magnesia-carbon bricks. The preparation method is simple in processing steps and high in operability, has low requirements on equipment and is applicable to large-batch industrial production.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to an anti-corrosion magnesia carbon brick. Background technique [0002] Magnesia carbon brick is a high-quality refractory material, which is widely used in electric furnaces, converters and refining furnaces. With the continuous development of the iron and steel industry, the requirements for the performance of magnesia-carbon bricks are getting higher and higher, and the oxidation of carbon in magnesia-carbon bricks seriously affects its service life and restricts its development. Therefore, improving its oxidation resistance is of great significance to improving the performance and quality of magnesia carbon bricks and the development of magnesia carbon brick industry. [0003] In order to improve the oxidation resistance of magnesia carbon bricks under high temperature conditions, the key is to control the decarburization speed of the material. A commonly used m...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/043
CPCC04B35/0435C04B35/66C04B2235/3279C04B2235/3281C04B2235/3418C04B2235/3813C04B2235/425C04B2235/48
Inventor 张刚
Owner 长兴长恒耐火材料股份有限公司
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