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Preparation method of normal temperature solidified magnesium carbon brick

A technology of room temperature curing, magnesia carbon brick

Inactive Publication Date: 2011-12-14
江苏苏嘉集团新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Phenolic resin-bonded magnesia-carbon bricks consume energy during baking and curing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 99 parts of magnesia, mix 0.3 part of magnesia with a particle size of less than 0.088mm and calcium oxide powder in a mixer for 20 minutes to obtain a premix; add the rest of magnesia and 4 parts of thermosetting phenolic resin liquid into the mixer, Mix for 2 minutes; add 0.6 parts of carbon black and 0.4 parts of high-temperature asphalt powder, and mix for 5 minutes; then add the premix and mix for 10 minutes to obtain the mixed mud; put the mixed mud into the mold of the press, pressurize and shape at 100MPa, A shaped magnesia-carbon brick is obtained; the shaped magnesia-carbon brick is stored at room temperature for 2 days to obtain a magnesia-carbon brick.

[0020] The particle size of the magnesia is greater than 0 and less than or equal to 5mm.

[0021] The compressive strength of the magnesia carbon brick after molding is ≥ 25MPa, and the compressive strength is ≥ 45MPa after being stored at room temperature at 25°C for 48 hours.

Embodiment 2

[0023] Take 80 parts of magnesia, mix magnesia with particle size less than 0.088mm, 1 part of calcium oxide powder, and 0.5 parts of boron carbide in a mixer for 2 minutes to obtain a premix; add the remaining magnesia, 20 parts Graphite and 3 parts of phenolic resin binder were mixed for 5 minutes; then the premix was added and mixed for 15 minutes to obtain a mixed mud; the mixed mud was put into a press mold and pressurized at 200MPa to obtain a molded magnesia carbon brick; The formed magnesia carbon bricks are stored at room temperature for 3 days to obtain magnesia carbon bricks.

[0024] The particle size of the magnesia is greater than 0 and less than or equal to 10mm.

[0025] The compressive strength of the magnesia carbon brick after molding is ≥ 20MPa, and the compressive strength is ≥ 35MPa after being stored at room temperature at 25°C for 48 hours. After the magnesia carbon brick has passed the anti-oxidation test at 1000°C×3h in the air, the thickness of the ...

Embodiment 3

[0027] Take 90.5 parts of magnesia, 8 parts of graphite, 1.5 parts of high-temperature asphalt powder, 0.1 part of calcium oxide powder and 2 parts of phenolic resin binder into an inclined mixer, and mix for 25 minutes to obtain a mixed mud; put the mixed mud Put it into the mold of the press, and press it under 300MPa to obtain the formed magnesia-carbon brick; store the formed magnesia-carbon brick at room temperature for 4 days to obtain the magnesia-carbon brick.

[0028] The particle size of the magnesia is greater than 0 and less than or equal to 6mm.

[0029] The compressive strength of the magnesia-carbon brick is ≥25MPa after molding, the compressive strength is ≥40MPa after being stored at room temperature at 25°C for 72 hours, and the high-temperature flexural strength is ≥8MPa. After the magnesia-carbon brick is subjected to an anti-oxidation test at 1000°C×3h in high-temperature air, the thickness of the decarburized layer is ≤6mm.

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Abstract

The invention relates to a preparation method of a normal temperature solidified magnesium carbon brick, belonging to the technical field of fireproof material. The preparation comprises the following steps: mixing small size magnesia and calcium oxide powder in a mixer to obtain a premix; adding the rest magnesia and phenolic resin binder and carbon in a mixing roll for mixing; then adding the premix for mixing to obtain mixed mud; putting the mixed mud in a press die for forcing molding to obtain a formed magnesium carbon brick; and putting the formed magnesium carbon brick for preservation at room temperature for 2-4 days to obtain the magnesium carbon brick. The mixing order and mixing time are different depending on the different selected mixing devices. If a tilting reverse flow mixer is used for mixing, the premixing technology can be omitted, and the required materials are directly put into the mixer for mixing to obtain the mixed mud. According to the invention, the technologies of seting, baking and the like are omitted, energy and labor are saved, and the discharge of pollutant is reduced.

Description

technical field [0001] The invention relates to a preparation method of magnesia-carbon brick solidified at room temperature, and belongs to the technical field of refractory materials. Background technique [0002] Magnesia-carbon brick is a high-quality refractory material. Because this kind of carbon-containing refractory product has the advantages of high refractoriness, good slag resistance, strong thermal shock resistance and low high-temperature creep, it is widely used in steelmaking electric furnaces, converters and refining furnaces. It has been widely used in the world, and has greatly improved the life of the furnace lining, so it has been rapidly promoted and applied by many countries around the world. [0003] The main raw materials of magnesia carbon bricks include magnesia, graphite and organic binders, among which the binder is the key to the production of magnesia carbon bricks. Now the production of magnesia carbon bricks mostly uses synthetic phenolic re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 俞晓东张雪松
Owner 江苏苏嘉集团新材料有限公司
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