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Magnesia carbon brick taking composite magnesia as major raw material and preparation method thereof

A main raw material, magnesia-carbon brick technology, applied in the field of refractory materials, can solve the problems of unstable performance of waste bricks, complex processes, and high production costs, and achieve the effects of saving unstable product quality, simple process methods, and reducing production costs.

Active Publication Date: 2011-06-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the magnesia-carbon bricks produced in the refractory industry are mainly fused magnesia. Although the performance of fused magnesia is better than that of sintered magnesia, the price of fused magnesia is higher than that of sintered magnesia. The price of magnesia is 1000-1800 yuan higher than that of sintered magnesia, and the production cost is relatively high
At present, some domestic manufacturers use waste magnesia-carbon bricks to recycle and reproduce magnesia-carbon bricks, which reduces the cost to a certain extent, but there are also great disadvantages, such as the unstable performance of waste bricks, and the requirements for waste bricks are relatively high during reproduction. High, the process of processing waste bricks from different manufacturers is relatively complicated, and the use of waste bricks for production requires high management conditions for manufacturers, which is not easy to control, resulting in unstable performance of the produced magnesia carbon bricks, so use waste bricks to produce magnesia carbon bricks Not the most effective way to reduce costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The first step: crushing and grading of composite magnesia:

[0021] According to the ratio of 90% sintered magnesia and 10% fused magnesia, respectively mix fused magnesia and sintered magnesia evenly, crush and sieve to obtain three kinds of magnesium with a particle size of 5-3mm, 3-1mm, and <1mm. sand particles;

[0022] Step Two: Mixing:

[0023] Add 90% composite magnesia and 10% flake graphite (the grade is -195) into the mixer and stir evenly, wherein: the composite magnesia particle gradation is: particle size 5-3mm accounts for 35%, particle size 3-1mm accounts for 35%, The particle size is 1-0.088mm, which accounts for 30%; then the metal aluminum powder with an average particle size of 100-120 mesh, whose weight accounts for 2% of the total weight of composite magnesia and flake graphite, and the metal powder whose weight accounts for 2% of the total weight of composite magnesia and flake graphite Silica powder, ZrO with an average particle size of 180-200...

Embodiment 2

[0027] The first step: crushing and grading of composite magnesia:

[0028] According to the ratio of 50% sintered magnesia and 50% fused magnesia, respectively mix fused magnesia and sintered magnesia evenly, crush and sieve to obtain three kinds of magnesium with a particle size of 5-3mm, 3-1mm, and <1mm. sand particles;

[0029] The second step: mixing materials: composite magnesia 85 ~ 90

[0030] Add 87% composite magnesia and 13% flake graphite (the brand is -195) into the mixer and stir evenly, wherein: the composite magnesia particle gradation is: particle size 5-3mm accounts for 35%, particle size 3-1mm accounts for 35%, The particle size is 1-0.088mm, accounting for 30%; then the metal aluminum powder with an average particle size of 150-180 mesh, whose weight accounts for 2% of the total weight of composite magnesia and flake graphite, and the metal powder whose weight accounts for 3% of the total weight of composite magnesia and flake graphite Silica powder, ZrO ...

Embodiment 3

[0034] The first step: crushing and grading of composite magnesia:

[0035] According to the ratio of 10% sintered magnesia and 90% fused magnesia, respectively mix fused magnesia and sintered magnesia evenly, crush and sieve three kinds of magnesium with a particle size of 5-3mm, 3-1mm, and <1mm. sand particles;

[0036] Step Two: Mixing:

[0037] Add 85% composite magnesia and 15% flake graphite (grade -195) into the blender and stir evenly, wherein: the composite magnesia particle gradation is: 35% with a particle size of 5-3mm, 35% with a particle size of 3-1mm, The particle size is 1-0.088mm, accounting for 30%; then the metal aluminum powder with an average particle size of 200-220 mesh, which accounts for 2% of the total weight of the composite magnesia and flake graphite, and the metal silicon powder, which accounts for 1% of the total weight of the composite magnesia and flake graphite Zirconia powder, Si 3 N 4 Powder, weight accounts for 4% phenolic resin of comp...

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PUM

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Abstract

The invention discloses a magnesia carbon brick taking composite magnesia as a major raw material. The brick consists of the following components in percentage by weight: 85 to 90 percent of composite magnesia, 10 to 15 percent of crystalline flake graphite and a small quantity of antioxidants, modifying agents and phenolic resin. A preparation method of the brick comprises the following steps of: grinding the composite magnesia and sieving into magnesia particles with the particle sizes of between 5 and 3 millimeters, between 3 and 1 millimeter(s) and less than 1 millimeter; preparing the particles to obtain the composite magnesia according to a multi-stage particle proportion, adding the crystalline flake graphite, the antioxidants, the modifying agents and the phenolic resin into a stirrer and uniformly stirring; and performing press forming on a pressure machine and preserving heat at the temperature of between 180 and 240 DEG C for 10 to 13 hours to obtain a finished product. A process method is simple and is convenient to operate; the prepared material has residue resistance, high temperature intensity and thermal shock resistance which are accordant with international standards, is difficult to crack, and is suitable for industrial product; and the production cost of the magnesia carbon brick can be effectively lowered.

Description

technical field [0001] The invention discloses a magnesia-carbon brick with composite magnesia as the main raw material and a preparation method thereof, and relates to the technical field of refractory materials. Background technique [0002] At present, the magnesia-carbon bricks produced in the refractory industry are mainly fused magnesia. Although the performance of fused magnesia is better than that of sintered magnesia, the price of fused magnesia is higher than that of sintered magnesia. The price of magnesia is 1000-1800 yuan higher than that of sintered magnesia, and the production cost is relatively high. At present, some domestic manufacturers use waste magnesia-carbon bricks to recycle and reproduce magnesia-carbon bricks, which reduces the cost to a certain extent, but there are also great disadvantages, such as the unstable performance of waste bricks, and the requirements for waste bricks are relatively high during reproduction. High, the process of processi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 程本军赵启成陈旺丁芳
Owner CENT SOUTH UNIV