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Method for producing regenerated magnesia carbon bricks by waste refractory bricks

A technology for refractory bricks and magnesia-carbon bricks, which is applied in the field of producing regenerated magnesia-carbon bricks by using waste refractory bricks, which can solve the problems of unreasonable treatment methods, low recycling rate, waste of resources, etc., and achieve good performance and recycling and the effect of increasing added value and reducing waste

Inactive Publication Date: 2017-09-19
浙江欣辉耐火材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of unreasonable domestic waste refractory treatment methods, waste of resources and low recycling rate, the present invention provides a method for producing regenerated magnesia-carbon bricks with high recycling rate and good performance of recycled products using waste refractory bricks. method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Divide waste refractory bricks into four categories: magnesia-carbon, aluminum-magnesium-carbon, aluminum-carbon and aluminum-silicon-carbide-carbon;

[0029] (2) Select the waste refractory bricks that have been classified in step (1), based on the total mass of recycled materials, and make ingredients according to the following composition ratio: 86% MgO, 3.5% SiO 2 , 4.5% Al 2 o 3 , and the balance is impurities to obtain recycled materials;

[0030] (3) Crushing the recycled materials to obtain recycled pellets, and magnetically separating the recycled pellets to remove iron;

[0031] (4) Classify the regenerated pellets after magnetic separation and iron removal. Based on the total mass of the regenerated pellets, the particle size and mass percentage of the regenerated pellets obtained after the middle particle classification are: 5~3mm Particles accounted for 35%, 3~1mm particles accounted for 55%, and 0.5~0.1mm particles accounted for 10%.

[0032] (5) H...

Embodiment 2

[0036] (1) Divide waste refractory bricks into four categories: magnesia-carbon, aluminum-magnesium-carbon, aluminum-carbon and aluminum-silicon-carbide-carbon;

[0037] (2) Select the waste refractory bricks that have been classified in step (1), based on the total mass of recycled materials, and make ingredients according to the following composition ratio: 90% MgO, 2.5% SiO 2 , 2.5% Al 2 o 3 , and the balance is impurities to obtain recycled materials;

[0038] (3) Crushing the regenerated material after magnetic separation and iron removal to obtain regenerated pellets, and performing magnetic separation and iron removal on the regenerated pellets;

[0039] (4) Classify the recycled pellets. Based on the total mass of the recycled pellets, the particle size and mass percentage of the recycled pellets obtained after classification of the medium pellets are: 5~3mm particles account for 30%, 3 ~1mm particles accounted for 45% and 0.5~0.1mm particles accounted for 25%.

[...

Embodiment 3

[0044] (1) Divide waste refractory bricks into four categories: magnesia-carbon, aluminum-magnesium-carbon, aluminum-carbon and aluminum-silicon-carbide-carbon;

[0045](2) Select the waste refractory bricks that have been sorted in step (1), based on the total mass of recycled materials, and make ingredients according to the following composition ratio: 95% MgO, 1.5% SiO 2 , 0.5% Al 2 o 3 , and the balance is impurities to obtain recycled materials;

[0046] (3) Crushing the regenerated material after magnetic separation and iron removal to obtain regenerated pellets, and performing magnetic separation and iron removal on the regenerated pellets;

[0047] (4) Classify the recycled pellets. Based on the total mass of the recycled pellets, the particle size and mass percentage of the recycled pellets obtained after grading the medium particles are: 5~3mm particles account for 25%, 3 ~1mm particles accounted for 52% and 0.5~0.1mm particles accounted for 23%.

[0048] (5) Hea...

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Abstract

The invention provides a method for producing regenerated magnesia carbon bricks by waste refractory bricks. The method includes steps: sorting the waste refractory bricks; preparing materials on the basis of the total mass of regenerated materials according to conditions that a mass ratio of MgO is larger than or equal to 86%, a mass ratio of SiO2 is smaller than or equal to 3.5%, a mass ratio of Al2O3 is smaller than or equal to 4.5%, and the rest is impurities; performing crushing, magnetic separation for iron removal, particle classification, heating and drying; adding materials, mixing, performing high-pressure calcination moulding, and cooling to obtain the regenerated magnesia carbon bricks. By adoption of the waste refractory bricks for production of the regenerated magnesia carbon bricks, technical simplicity and reduction of waste of the waste refractory bricks are realized, waste recycling and additional value increase are benefited, the produced regenerated magnesia carbon bricks are great in each performance, and considerable economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a method for producing recycled magnesia-carbon bricks by using waste refractory bricks. Background technique [0002] In recent years, with the rapid growth of my country's steel production, the consumption of domestic refractory materials has also increased greatly. Among them, the proportion of waste refractory materials has reached 45% of the total consumption of refractory materials, and the current processing method of waste refractory materials is still Most of them are buried as industrial waste, and only a small amount is roughly utilized. It is a pity that waste refractory materials are treated as garbage, which not only increases the processing cost, but also causes some pollution to the environment and wastes precious resources. At present, the recycling rate of waste refractory materials in China is not high, and its utilization method is too simple and ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/622
CPCC04B35/62204C04B35/66C04B2235/3217C04B2235/425C04B2235/48C04B2235/77C04B2235/96
Inventor 袁海强
Owner 浙江欣辉耐火材料股份有限公司
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