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Preparation method of regenerated alumina-magnesia-carbon bricks for ladle edge part

A technology for recycling aluminum and magnesia carbon bricks, applied in the field of refractory materials, can solve the problems of environmental pollution, occupying resource space, increasing costs, etc., and achieve the effect of reducing production costs

Inactive Publication Date: 2020-01-10
SHANGHAI LIER REFRACTORY MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the rapid development of my country's iron and steel industry in recent years, magnesia carbon bricks are an indispensable excellent refractory material for the iron and steel industry. More than 700,000 tons. With the rapid increase in the price of fused magnesia raw materials affected by environmental protection since 2017, a lot of costs have been added to downstream refractory manufacturers, and some manufacturers are facing the risk of bankruptcy. Therefore, these used magnesia Waste magnesia-carbon brick refractories have become an indispensable raw material to replace high-quality magnesia. However, when these waste magnesia-carbon brick materials are reprocessed, selected and graded, a large amount of unusable aluminum-magnesia-carbon raw materials are produced. According to preliminary investigations, at least some 100,000 tons of recycled aluminum-magnesium-carbon materials. These selected carbon-containing industrial wastes not only take up a lot of resource space, but also pollute the environment. Therefore, the reduction and consumption make this part of aluminum-magnesium-carbon materials a renewable resource. and solve environmental problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1, mixing: First, add the regenerated aluminum-magnesium-carbon particles into the mixer according to a certain proportion and dry mix for 5 minutes, then slowly add the binder and mix for 3 minutes, then add flake graphite and mix for 10 minutes, and finally add the electric melting Magnesia fine powder, recycled aluminum-magnesium carbon fine powder, high-temperature asphalt powder, metal aluminum powder and metal silicon powder are compounded and mixed for 30 minutes to discharge;

[0025] Step 2, forming: Put the mixed mud into the mud basin for 10 minutes, weigh a certain weight of mud and put it into the mold frame of the press, and press it on a press with a pressure of 6300KN;

[0026] Step 3, baking: put the pressed semi-finished bricks into a dry tunnel kiln to bake and solidify, the baking temperature is 180°C, and the baking time is 22 hours;

[0027] In this embodiment, according to the mass percentage, the percentages of each component are 72% for rec...

Embodiment 2

[0029] Step 1, mixing: First, add the regenerated aluminum-magnesium-carbon particles into the mixer according to a certain proportion and dry mix for 5 minutes, then slowly add the binder and mix for 3 minutes, then add flake graphite and mix for 10 minutes, and finally add the electric melting Fine magnesia powder, high temperature asphalt powder, metal aluminum powder and metal silicon powder are compounded and mixed for 30 minutes to discharge;

[0030] Step 2, forming: Put the mixed mud into the mud basin for 10 minutes, weigh a certain weight of mud and put it into the mold frame of the press, and press it on a press with a pressure of 6300KN;

[0031] Step 3, baking: put the pressed semi-finished brick adobe into a drying kiln to bake and solidify, the baking temperature is 200°C, and the baking time is 22 hours.

[0032] In this embodiment, by mass percentage, the percentages of each component are 73% for regenerated aluminum-magnesium-carbon particles 5-1mm, 10% for f...

Embodiment 3

[0034] Step 1, mixing: First, add the regenerated aluminum-magnesium-carbon particles into the mixer according to a certain proportion and dry mix for 5 minutes, then slowly add the binder and mix for 3 minutes, then add flake graphite and mix for 10 minutes, and finally add the electric melting Fine magnesia powder, high temperature asphalt powder, metal aluminum powder and metal silicon powder are compounded and mixed for 30 minutes to discharge;

[0035] Step 2, forming: Put the mixed mud into the mud basin for 10 minutes, weigh a certain weight of mud and put it into the mold frame of the press, and press it on a press with a pressure of 6300KN;

[0036] Step 3, baking: put the pressed semi-finished brick adobe into a drying kiln to bake and solidify, the baking temperature is 220°C, and the baking time is 22 hours.

[0037] In this embodiment, by mass percentage, the percentages of each component are 75% for regenerated aluminum-magnesium-carbon particles 5-1 mm, 7% for f...

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Abstract

The invention relates to the technical field of refractory materials, and especially relates to a preparation method of regenerated alumina-magnesia-carbon bricks for a ladle edge part. The alumina-magnesia-carbon bricks comprise 55-75% of regenerated alumina-magnesia-carbon particles, 10-15% of regenerated alumina-magnesia-carbon fine powder, 5-10% of fused magnesite fine powder, 1-2% of metallicaluminum powder, 1-2% of metallic silicon powder, 3-8% of crystalline flake graphite and 2-4% of a binder. Waste magnesia carbon bricks and carbon-containing wastes left after alumina-magnesia-carbonconversion are used as main raw materials, an efficient antioxidant is added, and the regenerated alumina-magnesia-carbon bricks are generated under certain production process conditions, so that theproblem that carbon-containing wastes left after screening of waste magnesia-carbon bricks and alumina-magnesia-carbon bricks is useless is solved, the production cost of the magnesia-carbon bricks is reduced, environmental pollution and resource wastes are reduced, and the purpose of resource recycling is achieved.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a method for preparing regenerated aluminum-magnesium-carbon bricks used in ladle edges. Background technique [0002] As a new refractory material that emerged in the 1970s, magnesia carbon bricks are made of magnesia as the main raw material. They have high refractoriness, excellent thermal shock resistance and strong corrosion resistance, and are widely used in iron and steel enterprises. . With the rapid development of my country's iron and steel industry in recent years, magnesia-carbon bricks are an indispensable excellent refractory material for the iron and steel industry. More than 700,000 tons. With the rapid increase in the price of fused magnesia raw materials affected by environmental protection since 2017, a lot of costs have been added to downstream refractory manufacturers, and some manufacturers are facing the risk of bankruptcy. Therefore, these use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
CPCC04B35/66C04B35/62204C04B2235/402C04B2235/428C04B2235/425C04B2235/3206C04B2235/3217
Inventor 孙佳琛马四凯李维锋李洪波魏振国
Owner SHANGHAI LIER REFRACTORY MATERIAL
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