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Method for preparing regenerative magnesia-carbon bricks

A magnesia-carbon brick and magnesia-carbon technology, which is applied in the field of refractory materials, can solve problems such as brick body cracking, and achieve the effects of high refractoriness, short treatment time and strong slag resistance.

Inactive Publication Date: 2016-06-29
申久祝
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology makes better use of waste magnesia-carbon bricks and saves resources, but there are still shortcomings. Since AL powder is generally added to the production formula of magnesia-carbon bricks as an antioxidant for carbon components, 4Al+H2O=Al4C3 when used at high temperatures, Al4C3 is easy to hydrate at room temperature, leading to brick cracking
Therefore, the quality of recycled refractories produced by this method needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The preparation method of the regenerated magnesia carbon brick is operated according to the following process steps.

[0013] Sorted stacking: After dismantling the cans at the ironmaking and steelmaking sites, they are sorted and stacked according to magnesium-carbon, aluminum-magnesium-carbon, and aluminum-silicon carbide-carbon bricks.

[0014] Sorting and removing impurities: Use a special hammer to remove soil, slag, and iron pieces on the surface of waste bricks, knock off the metamorphic layer, and stack them neatly in the pretreatment area as required.

[0015] Pulverization: Put it in an acid-resistant container, spray it evenly with a weak acidic aqueous solution, let it stand for no less than 4 hours, and pass it into 100-110°C steam for no less than 3 hours.

[0016] Drying: Load the treated waste bricks into the kiln car, enter the tunnel drying kiln, and dry at 120°C for 24 hours.

[0017] Dehydration treatment: High temperature drying treatment at 900°C...

Embodiment 2

[0022] The preparation method of the regenerated magnesia carbon brick is operated according to the following process steps.

[0023] Sorted stacking: After dismantling the cans at the ironmaking and steelmaking sites, they are sorted and stacked according to magnesium-carbon, aluminum-magnesium-carbon, and aluminum-silicon carbide-carbon bricks.

[0024] Sorting and removing impurities: Use a special hammer to remove soil, slag, and iron pieces on the surface of waste bricks, knock off the metamorphic layer, and stack them neatly in the pretreatment area as required.

[0025] Pulverization: Put it in an acid-resistant container, spray it evenly with a weak acidic aqueous solution, let it stand for no less than 4 hours, and pass it into 100-110°C steam for no less than 3 hours.

[0026] Drying: Load the treated waste bricks into the kiln car, enter the tunnel drying kiln, and dry at 120°C for 24 hours.

[0027] Dehydration treatment: high temperature drying treatment at 800°C...

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Abstract

The invention belongs to the technical field of a refractory material, and discloses a method for preparing regenerative magnesia-carbon bricks. The method comprises the following technical flow steps: piling in classification; sorting; removing impurities; preprocessing; pulverizing; dehydrating; screening; packing; and molding the bricks. Regeneration grains can be used for producing regenerated magnesia carbon bricks, aluminum-magnesium-carbon bricks, aluminum carborundum carbon bricks, tundish dry materials, aluminum-magnesium-carbon fireclay and slag-pot unfired bricks. The regeneration use rate of the carbonic crushed bricks can reach as high as 100 percent. The method saves resources, clears garbage and protects the environment.

Description

technical field [0001] The invention relates to a method for preparing regenerated magnesia-carbon bricks, belonging to the technical field of refractory materials. Background technique [0002] The iron and steel industry is a large consumer of refractory materials. According to reports, in 2004, the consumption of refractory materials in national iron and steel enterprises was about 9 million tons, and the used refractory materials were more than 4 million tons. Refractory materials play a decisive role in the quality of steel in the steel production process. In the case of ensuring the quality and quality requirements of steel, in order to ensure the stability of the production process, low cost and green environmental protection of refractory materials are very important. Waste refractories are wastes that are dismantled after being used as kiln lining materials in metallurgical glass cement ceramics and chemical industries. At present, the main measures taken for thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66B09B3/00
Inventor 申久祝
Owner 申久祝
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