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Long-life VOD refining ladle molten pool magnesium-aluminum-carbon brick and preparation method thereof

A magnesia-alumina-carbon brick and long-life technology, applied in the field of refractory materials, can solve the problems of high consumption per ton of steel, low service life, easy pulverization and peeling, etc., and achieves low melting loss rate, long service life, and improved thermal shock stability. and sinterability

Pending Publication Date: 2021-08-24
SHANGHAI LIER REFRACTORY MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since non-burned magnesia-calcium-carbon bricks and non-fired magnesia-dolomite bricks also have the problem of easy pulverization and peeling during intermittent production, currently stainless steel uses low-carbon magnesia-carbon bricks to replace non-fired magnesia-calcium carbon bricks and non-fired magnesia white jade bricks, especially The service life of VOD refining ladle molten pool bricks is low, resulting in much higher consumption per ton of steel for VOD refining ladle refractories than ordinary carbon steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] A kind of magnesia-alumina-carbon brick for long-life VOD refining ladle molten pool, its preparation method, concrete steps are as follows:

[0029] S1, take fused magnesia, fused white corundum, flaky graphite, high-temperature pitch powder, carbon-containing resin powder, metal silicon, metal aluminum and thermosetting phenolic resin, and set aside;

[0030] S2, finely grind the fused magnesia sand, and classify it into four kinds of granular raw materials with different particle sizes of 5-3mm, 3-1mm, 1-0mm and 200 mesh, and set aside;

[0031] S3, grinding the fused white corundum finely, grading it into granular raw materials with three different particle sizes of 3-1mm, 1-0mm and 200 mesh, for later use;

[0032] S4, grinding metal silicon, metal aluminum and carbon-containing resin into fine powders with a particle size of ≤200 mesh to obtain metal silicon powder, metal aluminum powder and carbon-containing resin powder for subsequent use;

[0033] S5, by weigh...

Embodiment 1

[0037] A preparation method of magnesia-alumina-carbon bricks for long-life VOD refining ladle molten pool, comprising the following steps:

[0038] a. Take fused magnesia, fused white corundum, flake graphite, high-temperature pitch powder, carbon-containing resin powder, metal silicon, metal aluminum and thermosetting phenolic resin, and set aside;

[0039] b. Grind the fused magnesia sand and classify it into four kinds of granular raw materials with different particle sizes: 5-3mm, 3-1mm, 1-0mm and 200 mesh, and set aside;

[0040] c Grind the fused white corundum finely, classify it into granular raw materials with three different particle sizes of 3-1mm, 1-0mm and 200 mesh, and set aside;

[0041] d. Grinding metallic silicon, metallic aluminum and carbon-containing resin into fine powders with a particle size of ≤200 mesh to obtain metallic silicon powder, metallic aluminum powder and carbon-containing resin powder for subsequent use;

[0042] e. Take 67% of fused magn...

Embodiment 2

[0049]A preparation method of magnesia-alumina-carbon bricks for long-life VOD refining ladle molten pool, comprising the following steps:

[0050] a. Take fused magnesia, fused white corundum, flake graphite, high-temperature pitch powder, carbon-containing resin powder, metal silicon, metal aluminum and thermosetting phenolic resin, and set aside;

[0051] b. Grind the fused magnesia sand and classify it into four kinds of granular raw materials with different particle sizes: 5-3mm, 3-1mm, 1-0mm and 200 mesh, and set aside;

[0052] c Grind the fused white corundum finely, classify it into granular raw materials with three different particle sizes of 3-1mm, 1-0mm and 200 mesh, and set aside;

[0053] d. Grinding metallic silicon, metallic aluminum and carbon-containing resin into fine powders with a particle size of ≤200 mesh to obtain metallic silicon powder, metallic aluminum powder and carbon-containing resin powder for subsequent use;

[0054] e. Take 62% of fused magne...

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Abstract

The invention relates to the technical field of refractory materials, in particular to a long-life VOD refining ladle molten pool magnesia-alumina-carbon brick and a preparation method thereof, and the magnesia-alumina-carbon brick is prepared from the following raw materials in percentage by weight: 50-70% of fused magnesite, 10-20% of fused white corundum, 6-16% of crystalline flake graphite, 1-4% of metal silicon powder, 0.08-4% of metal aluminum powder, 1-10% of an additive and 2-8% of thermosetting phenolic resin. The aluminum oxide is introduced into the mature low-carbon magnesia carbon brick for a VOD steel ladle molten pool, the magnesium oxide and the aluminum oxide react to produce spinel, the thermal shock resistance and the sinterability of the molten pool brick are improved, and the prepared VOD steel ladle molten pool brick solves the problems of cracking and peeling caused by poor thermal shock resistance of an existing traditional VOD steel ladle molten pool brick. A refractory lining material for the molten pool of the VOD steel ladle built by the molten pool brick is low in melting loss rate, the consumption of the refractory material for the molten pool of the steel ladle per ton of steel can be obviously reduced, and the service life of the molten pool brick of the steel ladle for VOD refining is longer.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a magnesium-aluminum-carbon brick for a long-life VOD refining ladle molten pool and a preparation method thereof. Background technique [0002] Magnesia-chrome bricks were first used in the working lining of VOD ladles because of their excellent slag resistance. However, under the condition of intermittent work in VOD refining ladles, magnesia-chrome bricks are prone to spalling and damage, and their thermal shock resistance is poor. At the same time, due to the hexavalent The environmental protection of chromium is becoming more and more urgent for the refractory industry to be chromium-free. With the development of refractory technology, unburned magnesia-calcium-carbon bricks and unburned magnesia-dolomite bricks have gradually replaced magnesia-chrome bricks as the preferred material for the lining of VOD refining ladles. Since non-burned magnesia-calcium-carbo...

Claims

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Application Information

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IPC IPC(8): C04B35/043C04B35/622B22D41/02
CPCC04B35/043C04B35/622B22D41/02C04B2235/3217C04B2235/425C04B2235/428C04B2235/402C04B2235/5427C04B2235/5436C04B2235/9615C04B2235/9676
Inventor 李维锋李洪波马四凯李勇伟
Owner SHANGHAI LIER REFRACTORY MATERIAL