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Carbon-free unfired magnesia-alumina brick and preparation method thereof

A magnesia-alumina brick and fused magnesia technology, which is applied in the field of new refractory materials, can solve the problems of carbon-containing refractories and magnesia-chromium bricks, application restrictions of magnesia-chromium refractories, easy to produce peeling and other problems, so as to reduce porosity. , Eliminate harm to human body and environment, and prevent the effect of slag penetration and erosion

Pending Publication Date: 2021-11-05
JINAN LUDONG REFRACTORY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, when producing low-carbon and ultra-low-carbon stainless steel or fine steel, the refractory materials used for lining are basically fired magnesia-chrome bricks, but the hexavalent chromium in magnesia-chrome bricks is in the process of production and use. Both will cause environmental pollution and be harmful to the human body. Carbon-containing refractories and magnesia-chrome bricks will be subject to certain restrictions. The application of magnesia-chrome refractories in the world will be restricted, and magnesia-chrome bricks will easily peel off during the use of refining slag cladding lines. ; The carbon in carbon-containing refractories has an effect on the carbon content of molten steel. Therefore, chromium-free refractories for refining furnaces have become a trend, and more and more attention has been paid to them.

Method used

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preparation example Construction

[0033] A method for preparing carbon-free and non-fired magnesia-alumina bricks, comprising the following steps,

[0034] (1) Accurately measure the proportions of the raw materials, and premix the fused magnesia, alumina powder, and metal aluminum powder;

[0035] (2) Add the premix of fused magnesia, aluminum oxide powder, and metal aluminum powder into the mud mixer, after mixing for 2-3 minutes, add phenolic resin, and continue mixing for 8-10 minutes;

[0036] (3) Put the mixed mud material on a suitable mold and a brick press with suitable pressure to form it, produce the required brick shape, and place it on the brick car;

[0037] (4) Push the formed brick car into the tunnel drying kiln for 24 hours of drying. The drying temperature starts from the low temperature zone at the entrance of the kiln and gradually advances to the high temperature zone in the middle, and finally reaches the low temperature zone at the exit of the kiln for 24 hours. After leaving the kiln,...

Embodiment 1

[0039] The proportion of raw materials added is: select fused magnesia with a magnesium content of 96%, 83 parts of fused magnesia with a particle size of less than 0.088mm and 3-5mm in equal parts; select 10 parts of high-temperature α-alumina micropowder with a particle size of less than 1 μm; 4 parts of aluminum powder with a thickness of 0.074mm and metal activity greater than 98%; 3 parts of thermoplastic phenolic resin for refractory materials.

Embodiment 2

[0041] The proportion of raw materials added is: select fused magnesia with a magnesium content of 98%, 90 parts of fused magnesia with a particle size of less than 0.088mm, 0.088-1mm, and 3-5mm in equal parts; select corundum fine powder with a particle size of less than 0.074mm in equal parts and 6 parts of high-quality bauxite fine powder with a particle size of less than 0.074mm; 2 parts of aluminum-magnesium alloy powder with a particle size of less than 0.074mm and a metal activity greater than 98%; and 2 parts of thermoplastic phenolic resin for refractory materials.

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Abstract

The invention discloses a carbon-free unfired magnesia-alumina brick and a preparation method thereof, and mainly relates to the technical field of novel refractory materials. The carbon-free unfired magnesia-alumina brick comprises 83-95 parts of fused magnesite; 3-10 parts of alumina powder; 1-4 parts of metal aluminum powder; and 1-3 parts of phenolic resin. The aggregate of the magnesia-alumina brick is large-granularity fused magnesite, and the fine powder is a combination of MgO fine powder, Al2O3 powder, metal Al powder and other materials. MgO and Al2O3 in the fine powder are subjected to in-situ solid-phase synthesis to form spinel in a high-temperature use process, and the permanent expansion rate of the spinel and the stability of the spinel make up the spalling phenomenon caused by expansion of magnesia particles. A spinel layer is formed on the surface of the working layer, so that the product has better stripping resistance and slag corrosion resistance in the high-temperature use process, and the added metal aluminum powder or aluminum magnesium alloy powder plays a role in oxidation resistance.

Description

technical field [0001] The invention mainly relates to the technical field of new refractory materials, in particular to a carbon-free and non-fired magnesia-alumina brick and a preparation method thereof. Background technique [0002] At present, when producing low-carbon and ultra-low-carbon stainless steel or fine steel, the refractory materials used for lining are basically fired magnesia-chrome bricks, but the hexavalent chromium in magnesia-chrome bricks is in the process of production and use. Both will cause environmental pollution and be harmful to the human body. Carbon-containing refractory materials and magnesia-chrome bricks will be subject to certain restrictions. The application of magnesia-chrome refractory materials in the world is restricted, and magnesia-chrome bricks are prone to peeling off in the use of refining slag cladding lines ; Carbon in carbon-containing refractory materials has an effect on the carbon content of molten steel. Therefore, chromium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043C04B35/622C04B35/634
CPCC04B35/043C04B35/622C04B35/63476C04B2235/402C04B2235/401C04B2235/3217C04B2235/5436C04B2235/5427C04B2235/3222C04B2235/9684C04B2235/9669
Inventor 吕仁祥纪怀杰刘在春
Owner JINAN LUDONG REFRACTORY CO LTD
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