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Method for preparing magnesia carbon brick

A technology of magnesia-carbon bricks and magnesia, which is applied in the field of refractory materials, can solve problems such as energy consumption, achieve the effects of prolonging service life, reducing baking processes, and resisting erosion

Active Publication Date: 2013-11-06
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

[0025] Embodiment 1, the preparation of lightly burned dolomite powder

[0026] Burn the dolomite at 1100°C until it decomposes to obtain lightly burned dolomite, which is ground into powder after cooling and stored in an airtight manner. The total amount of calcium oxide and magnesium oxide in the lightly burned dolomite is ≥80%, the content of calcium oxide is ≥30%, and the content of magnesium oxide is ≥30%.

Embodiment 2

[0027] Embodiment 2, a kind of preparation method of magnesia carbon brick, by weight:

[0028] (1) Preparation of premix: Take 99 parts of magnesia with a particle size of 0-5mm, mix magnesia with a particle size of less than 0.088mm, 3 parts of light-burned dolomite powder, and 1 part of zirconium boride in a mixer in advance for 20 minutes to obtain premix;

[0029] (2) Mixing: add the remaining magnesia and 4 parts of phenolic resin binder to the mixer, and mix for 3 minutes; add 0.5 parts of carbon black, 0.5 parts of high-temperature asphalt powder, and mix for 5 minutes; then add step (1) to prepare The premix was mixed for 15 minutes to obtain the mixed mud;

[0030] (3) Press molding: Put the mixed mud obtained in step (2) into a press mold, press molding at 100 MPa, and obtain a formed magnesia carbon brick;

[0031] (4) Storage at room temperature: Store the formed magnesia-carbon bricks at room temperature for 2 days to obtain magnesia-carbon bricks.

[0032] Th...

Embodiment 3

[0033] Embodiment 3, a kind of preparation method of magnesia carbon brick, by weight:

[0034] (1) Preparation of premix: Take 80 parts of magnesia with a particle size of 0-6mm, mix magnesia with a particle size of less than 0.088mm, 0.8 part of light-burned dolomite powder, and 0.5 part of boron carbide in a mixer for 2 minutes in advance to obtain premix;

[0035] (2) Mixing: Add the remaining magnesia, 20 parts of graphite and 3 parts of phenolic resin binder into the mixer, and mix for 8 minutes; then add the premix prepared in step (1) and mix for 15 minutes to obtain the mixed sludge;

[0036] (3) Pressure molding: put the mixed mud obtained in step (2) into a press mold, and press molding at 200MPa to obtain a molded magnesia carbon brick;

[0037] (4) Storage at room temperature: Store the formed magnesia-carbon bricks at room temperature for 3 days to obtain magnesia-carbon bricks.

[0038] The compressive strength of the magnesia carbon brick after molding is ≥20...

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Abstract

The invention relates to a method for preparing a magnesia carbon brick, in particular to a method for preparing a magnesia carbon brick cured at normal temperature, and belongs to the technical field of fireproof materials. The method comprises the following steps of: mixing magnesite, a carbon element, a phenolic resin binding agent and light burned dolomite powder to obtain mixed mud; mixing by using an inclined reflux mixing machine to save a premixing process, namely mixing the required materials in the inclined reflux mixing machine directly to obtain mixed mud; putting the mixed mud into a pressing machine die, and forming under pressure to obtain a formed magnesia carbon brick; and saving the formed magnesia carbon brick at room temperature for 2 to 4 days to obtain the magnesia carbon brick. In the method, due to the elimination of a baking process, energy required by baking the magnesia carbon brick can be saved by 80 to 120 kilograms based on each ton of standard coal. The content of calcium oxide in the magnesia carbon brick is high, the magnesia carbon brick has certain high-temperature creep property, and compared with the ordinary magnesia carbon brick, the magnesia carbon brick prepared by the method is high in stripping resistance; and if the magnesia carbon brick is used as furnace lining materials for smelting stainless steel, the service life can be prolonged, and molten steel can be purified.

Description

technical field [0001] The preparation method of the magnesia-carbon brick of the present invention is specifically a kind of preparation of the magnesia-carbon brick solidified at normal 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...

Claims

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Application Information

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