Chromium-free magnesium composite brick used for VOD furnace and preparation method thereof

A composite brick, chrome-magnesium technology, applied in the field of refractory materials, can solve problems such as unsatisfactory service life, achieve good environmental protection, promote sintering, improve thermal shock stability and chemical corrosion resistance.

Active Publication Date: 2017-08-04
海城利尔麦格西塔材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, fired magnesia-chrome bricks are commonly used in VOD ladles, and some steel mills use unfired alumina-magnesia spinel bricks, but the service life is not ideal

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0035] A preparation method of chrome-free magnesia composite brick for VOD furnace, the specific method is as follows:

[0036] 1) crushing the large crystalline magnesia of the above-mentioned parts by weight in a crusher to make a fine powder raw material with a particle size of 200 mesh;

[0037] 2) Premixing large crystalline magnesia with a particle size of 200 mesh, yttrium oxide and dicalcium silicate in the above parts by weight in a mixer, and the premixing time is not less than 2 hours;

[0038] 3) Briquetting and sintering the uniformly premixed mixed raw materials in step 2) to make block raw materials, and the sintering temperature is 1550°C-1560°C;

[0039] 4) Put the block raw materials obtained after sintering into the crusher again for crushing, and sieve and finely grind the raw materials to make 3mm<grain size≤5mm, 1mm<grain size≤3mm, 0<grain size≤1mm, 200 mesh Four granular raw materials;

[0040] The parts by weight of the four kinds of granular raw mat...

Embodiment 1

[0045] A chrome-free magnesia composite brick for a VOD furnace is prepared from the following raw materials in parts by weight:

[0046] Aggregate: 51 parts of large crystal magnesia;

[0047] Ingredients: 3 parts of calcined alumina superfine powder, yttrium oxide (Y 2 o 3 ) 1 part, 3 parts of dicalcium silicate, 3 parts of fused zirconia fine powder with a particle size of 200 mesh;

[0048] Binder: 2 parts.

[0049] The binder is a mixture of phenolic resin and sodium silicate, and the weight ratio of phenolic resin to sodium silicate is 2:1.

[0050] A preparation method of chrome-free magnesia composite brick for VOD furnace, the specific method is as follows:

[0051] 1) crushing the large crystalline magnesia of the above-mentioned parts by weight in a crusher to make a fine powder raw material with a particle size of 200 mesh;

[0052] 2) Premixing large crystalline magnesia with a particle size of 200 mesh, yttrium oxide and dicalcium silicate in the above parts...

Embodiment 2

[0060] A chrome-free magnesia composite brick for a VOD furnace is prepared from the following raw materials in parts by weight:

[0061] Aggregate: 93 parts of large crystal magnesia;

[0062] Ingredients: 7 parts of calcined alumina superfine powder, yttrium oxide (Y 2 o 3 ) 2 parts, 5 parts of dicalcium silicate, 7 parts of fused zirconia fine powder with a particle size of 200 mesh;

[0063] Binder: 4 parts.

[0064] The binder is a mixture of phenolic resin and sodium silicate, and the weight ratio of phenolic resin to sodium silicate is 2:1.

[0065] A preparation method of chrome-free magnesia composite brick for VOD furnace, the specific method is as follows:

[0066] 1) crushing the large crystalline magnesia of the above-mentioned parts by weight in a crusher to make a fine powder raw material with a particle size of 200 mesh;

[0067] 2) Premixing large crystalline magnesia with a particle size of 200 mesh, yttrium oxide and dicalcium silicate in the above part...

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Abstract

The invention relates to a chromium-free magnesium composite brick used for a VOD furnace and a preparation method thereof. The preparation method comprises the following steps: firstly sintering macrocrystalline magnesium sand with yttrium oxide and dicalcium silicate at the temperature of about 1550 DEG C, firstly preparing a pre-prepared material with excellent high temperature mechanical properties by adopting a presintering method, taking the pre-prepared materials in different grain gradations as an aggregate of a mending material, also adopting electrically smelted zirconia and calcined alumina as additives to make an unfired chromium-free magnesium composite brick for replacing an existing fired magnesium chromium brick to be used, pollution of the magnesium chromium brick to the environment is avoided, and thermal shock resistance and high temperature bending strength of a refractory material used for the VOD furnace are improved, so that the service life of the VOD furnace is guaranteed.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a chromium-free magnesia composite brick for a VOD furnace and a preparation method thereof. Background technique [0002] Refractory materials for refining outside the furnace, including tar-fired magnesia-dolomite bricks and magnesia-carbon bricks, high-quality pre-reaction magnesia-chrome bricks and fused rebonded magnesia-chrome bricks. The study found that during the baking and resting period of the ladle, the surface of the carbon-containing lining brick was seriously decarburized, resulting in rapid damage to the lining. The use of magnesia-chrome bricks can effectively improve the performance and service life of refining furnace lining bricks because of their excellent corrosion resistance and peeling resistance. [0003] But with Cr 2 o 3 In the oxidizing environment of magnesia-chromium bricks, the trivalent Cr in it will be partially converted into hexavalent chr...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/043C04B35/622C04B35/63C04B35/634C04B35/626
CPCC04B35/0435C04B35/622C04B35/62645C04B35/6316C04B35/63476C04B2235/3217C04B2235/3225C04B2235/3454C04B2235/763
Inventor 杨敬彪王新杰张义先尹斌金钊王健骁
Owner 海城利尔麦格西塔材料有限公司
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