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Environment-friendly low-carbon magnesium carbon brick

A carbon-magnesium-carbon brick and an environment-friendly technology, which is applied in the field of environment-friendly low-carbon magnesia-carbon bricks and low-carbon magnesia-carbon bricks, can solve the problems of decreased erosion resistance of low-carbon magnesia-carbon bricks, difficulties in technology, environmental protection, cost, etc. There are problems such as pollution in molten steel, which can achieve the effect of reliable utilization, improved stability, and improved thermal shock resistance.

Active Publication Date: 2012-06-20
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

The former may lead to a decrease in the corrosion resistance of low-carbon magnesia-carbon bricks or the contamination of molten steel by additives, while the latter has difficulties in terms of technology, environmental protection and cost for large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: An environmentally friendly low-carbon magnesia-carbon brick includes the following process steps, and the component ratio is calculated in parts by weight (when the content is a percentage, the unit is weight percentage, the same below):

[0022] (1) Breaking the used magnesia-carbon bricks after removing the metamorphic layer and steel slag into waste brick particles with a maximum particle size of 6mm, the carbon content in the used magnesia-carbon bricks is 10%, and the magnesium oxide content is 85%; After the waste brick particles are rolled on the wheel mill for 60 minutes, the iron is removed by a magnetic separator, and the waste brick particles with a particle size of 3~5mm, 1~3mm and less than 1mm are obtained by screening. After testing, 3~5mm and 1~ The carbon content in the waste brick particles of 3mm is less than 3%, and the carbon content in the waste brick particles of less than 1mm is 30%; the waste brick particles smaller than 1mm are se...

Embodiment 2

[0026] Embodiment 2: An environment-friendly low-carbon magnesia-carbon brick comprises the following process steps, and the component ratio is calculated in parts by weight:

[0027] (1) Breaking the used magnesia-carbon bricks after removing the metamorphic layer and steel slag into waste brick particles with a maximum particle size of 3 mm, the carbon content in the used magnesia-carbon bricks is 18%, and the magnesium oxide content is 76%; After the waste brick particles are rolled on the wheel mill for 90 minutes, the iron is removed by the magnetic separator, and the waste brick particles with a particle size of 1~3mm and less than 1mm are obtained by screening. After testing, the waste brick particles with a particle size of 1~3mm The carbon content is less than 3%, and the carbon content in the waste brick particles less than 1mm is 30%; the waste brick particles less than 1mm are sent to the winnowing machine for winnowing, and the wind speed of the winnowing machine i...

Embodiment 3

[0031] Embodiment 3: an environmentally friendly low-carbon magnesia-carbon brick, comprising the following process steps, and the component ratio is calculated in parts by weight:

[0032] (1) Crush the used magnesia-carbon bricks after removing the metamorphic layer and steel slag into waste brick particles with a maximum particle size of 6mm. After the waste brick particles are rolled on a wheel mill for 65 minutes, iron is removed by a magnetic separator and screened Waste brick particles with a particle size of 3~5mm, 1~3mm and less than 1mm are obtained; the waste brick particles smaller than 1mm are sent to the winnowing machine for winnowing, and the wind speed of the winnowing machine is 10m / s, and the average specific gravity is ≤2.4. Light components and heavy components with an average specific gravity ≥ 2.8; the carbon content in the heavy components is 15%, the magnesium oxide content is 80%, the carbon content in the light components is 60%, and the magnesium oxi...

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Abstract

The invention relates to an environment-friendly low-carbon magnesium carbon brick. The component ratio is counted by weight part and the processing steps are as follows: (1) crushing, grinding, magnetically separating and screening wasted carbon-containing refractory bricks being free from deteriorated layers and steel slag, thereby obtaining the waste brick grains with the grain size more than 1 mm and less than 1 mm; sending the waste brick grains being less than 1 mm to an air separating machine so as to perform air separation and obtain the light components with the average weight less than or equal to 2.4 and the heavy components with the average weight more than or equal to 2.8; (2) placing 70-90 parts of magnesium sand, 0-5 parts of carbon, 2-25 parts of heavy component, 2-5 parts of bonding agent and 0-5 parts of antioxidant into a mixing mill for mixing into a sludge material; (3) placing the sludge material into a mould, pressing and forming a magnesium carbon brick blank; and (4) roasting and curing the magnesium carbon brick blank after being formed, thereby obtaining the environment-friendly low-carbon magnesium carbon brick. In the invention, the materials with magnesium sand clinkers as main ingredients are separated from the wasted carbon-containing refractory bricks. The materials are added into the low-carbon magnesium carbon brick, so that the total porosity of the low-carbon magnesium carbon brick is reduced and the heat vibration resistance of the magnesium carbon brick is increased.

Description

technical field [0001] The invention relates to a low-carbon magnesia-carbon brick, in particular to an environment-friendly low-carbon magnesia-carbon brick, belonging to the technical field of refractory material preparation. Background technique [0002] Since the introduction of carbon into refractory products, carbon-containing refractory materials have quickly developed into a remarkable class of excellent materials in refractory materials. Among them, magnesia-carbon bricks have become the most important and most used refractory materials for steelmaking. At present, there are hundreds of thousands of tons of magnesia-carbon bricks used in my country every year, and some of them have not been recycled, or the recycled magnesia-carbon bricks have not been fully utilized. [0003] The usual way to deal with carbon-containing waste refractory bricks is: sorting, crushing, homogenizing, sieving, and finally processing into waste brick particles of various particle sizes,...

Claims

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Application Information

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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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