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Non-oxide composite low-carbon magnesia-carbon brick

A non-oxide, carbon-magnesia-carbon brick technology, applied in the field of refractory materials, can solve the problems of low life, affecting the quality of special steel, easy peeling, etc., and achieve the effect of maintaining performance

Active Publication Date: 2007-09-19
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

In the smelting of low-carbon steel such as stainless steel and other special steel, if magnesia-carbon bricks are used, the carbon component will easily dissolve into molten steel during the smelting process, affecting the purity of molten steel and thus affecting the quality of special steel.
If the carbon content in magnesia-carbon bricks is reduced to 1 / 2 to 1 / 5 of magnesia-carbon bricks, the thermal shock resistance will become poor, easy to peel off, and the service life will be low
[0003] In recent years, new non-oxides such as alon, magnesium alon, and silicon nitride have shown people the advantages of high melting point, low thermal expansion rate, good thermal shock stability, and not easily infiltrated by steel slag. The use of refractory materials has the fatal weakness of poor oxidation resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Contains magnesia (5-0mm) 78.5%, graphite (400 mesh) 5%, magnesium aron (200 mesh) 4%, aluminum nitride (320 mesh) 4%, phenolic resin 3.5%, antioxidant: metal silicon ( 320 mesh) 1.5%, metal aluminum (320 mesh) 1.5%, silicon carbide (320 mesh) 2%.

[0017] Put magnesium aron, aluminum nitride, metal silicon, metal aluminum, silicon carbide, and magnesia fine powder into a V-shaped mixer in advance, mix for 10 minutes, and pack them into bags for later use; add magnesia particles, Mix phenolic resin for 3 minutes → add graphite and mix for 5 minutes → add pre-mixed fine powder and mix for 20 minutes, then pack into bags → weigh the mixed material and pour it into a 1000-ton friction press brick mold → press 10 times → finish Bricks are baked in a tunnel kiln at 200°C for 24 hours → packed out of the kiln.

Embodiment 2

[0019] It contains 94% of magnesia (5-0mm), 2% of graphite (400 mesh), 1.5% of sialon (320 mesh), and 2.5% of phenolic resin.

[0020] Put graphite, sialon, and magnesia fine powder into the V-type mixer in advance, mix for 10 minutes, and pack it into a bag for later use; add magnesia particles and phenolic resin to the 750-wheel mill and mix for 2 minutes → add pre-mixed fine powder and mix Pack in bags after 20 minutes → weigh the mixed material and pour it into a 1000-ton friction press brick mold → press 10 times → put the laid bricks in a tunnel kiln at 200°C for 24 hours → pack out of the kiln.

Embodiment 3

[0022] Contains magnesia (5-0mm) 75%, carbon black (N660) 1%, magnesium aron (200 mesh) 13%, silicon nitride (320 mesh) 5%, aluminum nitride (320 mesh) 2%, asphalt 4%.

[0023] Put magnesium aron, aluminum nitride, silicon nitride, carbon black, and magnesia fine powder into a conical double-helix mixer in advance, mix for 20 minutes, and pack it into a bag for later use; heat the asphalt to 180°C to become a liquid and keep it warm; Heat the magnesia granules to 200°C and put them into a 750 wheel mill and mix for 1 minute → add liquid asphalt and mix for 3 minutes → add pre-mixed fine powder and mix for 18 minutes → put it in an incubator → weigh the hot material and pour it in 600-ton friction press in the brick mold → press 8 times → pack the bricks after cooling.

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PUM

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Abstract

A non-oxide compound magnesite-graphite brick containing carbon less than 6% belongs to a fire resisting material. The material contains magnesia of 75-94%, carbon of 1-5%, non-oxide such as nitride and boride of 0.4-20%, additive of 0-5%, and binder containg carbon. Such magnesite-graphite brick with low carbon has a low heat conductivity, a small acierating to the molten steel and less pollution to the low carbon steel compared to the common magnesite-graphite brick. The magnesite-graphite brick has a good slag resistance because the magnesia is the primary component. And it also has a good heat shock capacity because the carbon is one of the primary components. The carbon prevents said non-oxide from being oxidated. The brick maintains a good heat and shock resistance and slag resistance when reducing the proportion of the carbon because said non-oxide has a low heat expansion and a wet resistance to the slag.

Description

technical field [0001] The invention belongs to a refractory material, in particular to a non-oxide composite low-carbon magnesia-carbon brick. Background technique [0002] The melting point of magnesium oxide is 2800°C, which has strong high temperature resistance, but its thermal shock resistance and slag resistance are poor; carbon materials represented by graphite also have strong high temperature resistance, and their thermal expansion coefficient is low , The thermal shock resistance is very excellent, and it is not easy to infiltrate with molten steel and steel slag at high temperature. The two are compounded in a certain proportion to form a refractory material with good comprehensive performance - magnesia carbon brick. Magnesia carbon bricks are mainly used in steelmaking refractories, such as converters, steelmaking electric furnaces, and ladles. my country's existing magnesia-carbon bricks generally contain more than 10% carbon, and my country's metallurgical i...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B14/32C04B26/26C04B26/12C04B35/04
Inventor 张雪松朱光永俞晓东
Owner 江苏苏嘉集团新材料有限公司
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