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Magnesia carbon brick and preparation method thereof

A magnesia-carbon brick and carbon technology, which is applied in the field of magnesia-carbon bricks and its preparation, can solve the problems of insufficient adaptability of magnesia-carbon bricks, and achieve the effects of good resistance, improved service life, and simple preparation methods

Active Publication Date: 2018-05-29
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

Although magnesia carbon bricks are not adaptable enough under the above conditions, they are still irreplaceable

Method used

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  • Magnesia carbon brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A magnesia-carbon brick, comprising components by weight percentage: 85% of fused magnesia particles, 8% of carbon, 5% of additives, and 2% of binder.

[0021] (1) Mixing: Mixing is carried out with a rotary circulating mixer, and the fused magnesia particles, carbon, additives, and binders are weighed according to the ratio of raw materials, and the fused magnesia particles are first put into the mixing Dry mix in the machine for 5 minutes, then add binder and continue mixing for 5 minutes, then add carbon to it, mix for 8 minutes, finally add additives and continue mixing for 10 minutes to form mud, the speed of the mixer is set at 970r / min;

[0022] (2) Compression molding: add the mud material that has been mixed into the mold and use a compound friction brick press to perform compression molding to make bricks, and the pressure is 3000KN;

[0023] (3) Baking and curing: put the adobe in a tunnel-type drying kiln to bake and cure, the baking temperature is 200° C., ...

Embodiment 2

[0025] A magnesia-carbon brick, comprising components by weight percentage: 90% of fused magnesia particles, 5% of carbon, 2% of additives, and 3% of binder.

[0026] (1) Mixing: Mixing is carried out with a rotary circulating mixer, and the fused magnesia particles, carbon, additives, and binders are weighed according to the ratio of raw materials, and the fused magnesia particles are first put into the mixing Dry mix in the machine for 8 minutes, then add binder and continue mixing for 10 minutes, then add carbon to it, mix for 10 minutes, finally add additives and continue mixing for 8 minutes to form mud, the speed of the mixer is set at 980r / min;

[0027] (2) Compression molding: add the mud material that has been mixed into the mold and use a compound friction brick press to perform compression molding to make bricks, and the pressure is 3500KN;

[0028] (3) Baking and curing: the bricks are baked and cured in a tunnel-type drying kiln at a temperature of 200° C. for 20 ...

Embodiment 3

[0030] A magnesia-carbon brick, comprising components by weight percentage: 84% of fused magnesia particles, 10% of carbon, 4% of additives, and 2% of binder.

[0031] (1) Mixing: Mixing is carried out with a rotary circulating mixer, and the fused magnesia particles, carbon, additives, and binders are weighed according to the ratio of raw materials, and the fused magnesia particles are first put into the mixing Dry mix in the machine for 10 minutes, then add binder and continue mixing for 8 minutes, then add carbon to it, mix for 12 minutes, finally add additives and continue mixing for 12 minutes to form mud, the speed of the mixer is set at 970r / min;

[0032] (2) Compression molding: add the mud material that has been mixed into the mold and use a compound friction brick press to perform compression molding to make bricks, and the pressure is 4000KN;

[0033] (3) Baking and curing: put the adobe in a tunnel-type drying kiln to bake and cure, the baking temperature is 250° C...

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Abstract

The invention relates to a magnesia carbon brick and a preparation method thereof and belongs to the technical field of preparation of refractory materials. The magnesia carbon brick comprises the following components in parts by weight: 75-90 parts of electro-fused magnesite particles, 5-10 parts of carbon, 1-5 parts of an additive and 1-3 parts of a bonding agent. All the components are put in amuller for mulling and then are pressed, formed, baked and cured to obtain a final product, namely the magnesia carbon brick. The magnesia carbon brick and the preparation method thereof provided bythe invention have the benefits that the preparation method is simple, the steps are easy to operate, the thinking of a traditional magnesia carbon brick is changed, and a magnesite fine powder is notmixed; as a matrix is dominated by the carbon and a small quantity of additives, the better resistance of the magnesia carbon brick to high temperature, vacuum and acid slag is improved, so that theservice life of a refractory furnace lining is prolonged when advanced special steel is smelted, and the consumption of ton steel refractory materials is significantly reduced.

Description

technical field [0001] The invention relates to a magnesia-carbon brick and a preparation method thereof, belonging to the technical field of refractory preparation. Background technique [0002] The reason why the magnesia carbon brick has a very outstanding use effect is due to its two main components: magnesia and graphite. The main component of magnesia is magnesium oxide. The melting point of magnesium oxide is as high as 2800°C, which is much higher than the steelmaking temperature. The melting point of graphite is as high as 3500°C, the thermal expansion rate is very low, the toughness is good, and it is not easy to be wetted by slag and molten steel. And magnesia and graphite are not eutectic. Composite magnesia-carbon bricks, which have the advantages of both, have high temperature resistance and are not easily penetrated by steel slag. [0003] Magnesia carbon bricks also have weaknesses. Since magnesia is an alkaline oxide, the basicity of the slag during ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043
CPCC04B35/043C04B2235/405C04B2235/422C04B2235/5427C04B2235/77C04B2235/96C04B2235/9607C04B2235/9676
Inventor 曹丽云龚育才张雪松俞晓东茹红强
Owner 江苏苏嘉集团新材料有限公司
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