Slide gate brick and preparation method thereof

A sliding brick and magnesia technology, which is applied in the field of refractory materials, can solve the problems of low energy saving, high cost of spinel raw materials, high firing cost, etc., and achieve the effects of energy saving, good thermal shock stability and high refractoriness

Active Publication Date: 2016-09-28
HUNAN XIANGGANG RUITAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application number is 201110157006.6. By adding 10-30 parts of magnesia-alumina spinel to the aluminum-magnesia carbon skateboard brick, the thermal shock stability and slag erosion resistance of the slide can be improved. However, compared with magnesia, the raw material cost of spinel High; the magnesia sliding brick with application number 200410010211.X needs to be fired at 1550-1680°C, the firing cost is high and energy-saving

Method used

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preparation example Construction

[0038] The raw material for preparing the skateboard brick provided by the present invention includes magnesia. In the present invention, high-purity magnesia is used for the magnesia, and fused magnesia is preferably used for the magnesia. Among them, when preparing the sliding plate brick, the magnesia is preferably mixed with magnesia of different particle sizes. More preferably, the magnesia includes:

[0039] 25wt%~35wt% of magnesia particles with a particle size of 1~3mm and not equal to 1mm;

[0040] 30wt%~35wt% of magnesia particles with a particle size of 0.074~1mm and not equal to 0.074mm;

[0041] 15wt%-25wt% of fine magnesia powder with particle size ≤0.074mm.

[0042] In the present invention, the added amount of the magnesia is 80 wt% to 89.9 wt%, preferably 81 wt% to 88 wt%, more preferably 83 wt% to 86 wt%.

[0043] In the present invention, the raw material for preparing the skateboard tile further includes metallic aluminum, and the metallic aluminum is preferably me...

Embodiment 1

[0075] 1. The ratio of raw materials is:

[0076] 81.3wt% of high-purity fused magnesia (including: 30wt% of magnesia particles with a particle size of 1-3mm and not equal to 1mm, 34wt% of magnesia particles with a particle size of 0.074-1mm and not equal to 0.074mm And 17.3wt% of fine magnesia powder with a particle size ≤0.074mm);

[0077] 8.6wt% metal aluminum (including: 7.6wt% metal aluminum powder with a particle size of ≤0.088mm and 1wt% metal aluminum fiber)

[0078] 2.9wt% carbon black;

[0079] 2.9Wt% additives (including: 1wt% boron carbide and 1.9wt% boron nitride)

[0080] 4.3wt% binder (including: 3.3wt% phenolic resin and 1wt% organic silicon modified resin (Luxi Metallurgical Refractory Co., Ltd., model TMS)).

[0081] 2. Preparation process

[0082] Metal aluminum, additives, carbon black, and fine magnesia powder with a particle size of ≤0.074 mm are mixed to obtain a mixed powder.

[0083] Next, after adding magnesia particles with a particle size of> 0.074 mm to the pl...

Embodiment 2

[0097] 1. The ratio of raw materials is:

[0098] 84.2wt% of high-purity fused magnesia (including: 30wt% of magnesia particles with a particle size of 1 to 3mm and not equal to 1mm, 34wt% of magnesia particles with a particle size of 0.074 to 1mm and not equal to 0.074mm And 20.2wt% of fine magnesia powder with a particle size ≤0.074mm);

[0099] 7.7Wt% of metallic aluminum (including: 6.7% by weight of metallic aluminum powder with a particle size of ≤0.088mm and 1% by weight of metallic aluminum fiber)

[0100] 1.9wt% carbon black;

[0101] 1.9wt% of additive boron carbide

[0102] 4.3wt% binder (including: 3.3wt% phenolic resin and 1wt% organic silicon modified resin (Luxi Metallurgical Refractory Co., Ltd., model TMS)).

[0103] 2. Preparation process

[0104] Metal aluminum, additives, carbon black, and fine magnesia powder with a particle size of ≤0.074 mm are mixed to obtain a mixed powder.

[0105] Next, after adding magnesia particles with a particle size of> 0.074 mm into the p...

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Abstract

The invention provides a slide gate brick. The brick is prepared by the following components in percentages by mass: 80-89.9wt% of magnesia; 5-10wt% of metal aluminium; 1-3wt% of carbon black; 1-3wt% of an additive; and 3-5wt% of resin. The slide gate brick has the advantages of high refractoriness, good thermal shock stability, good stripping resistance, and good erosion resistance for slags; the slide gate brick has higher adaptability to high manganese steel, high calcium steel, high oxygen steel, and alloy steel; compared with the traditional magnesium slide gate brick which is baked at high temperature, magnesium aluminate spinel is not added into the preparation raw materials, high temperature is not needed for baking, so that energy is saved.

Description

Technical field [0001] The invention belongs to the technical field of refractory materials, and specifically relates to a skateboard brick and a preparation method thereof. Background technique [0002] Slide block is an important refractory material in the steelmaking process, and is mainly used for flow control in converters, molten steel tanks and tundishes. At present, the skateboard tiles used by steel mills mainly include aluminum-carbon, aluminum-zirconium-carbon and magnesia skateboards. When casting high-manganese steel, high-calcium steel, and high-oxygen steel, the aluminum-carbon and aluminum-zirconium-carbon sliding surfaces come into contact with the molten steel, and the oxygen in the molten steel and the CaO and MnO in the steel slag will react chemically to make the sliding bricks The structure of the working layer becomes loose, causing structural peeling of the skateboard brick, large hole expansion, and steel clamping, which in turn affects the number of tim...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/622C04B35/634
CPCC04B35/043C04B35/622C04B35/634C04B35/63476C04B2235/3821C04B2235/386C04B2235/402C04B2235/424C04B2235/524C04B2235/5427C04B2235/5436C04B2235/96C04B2235/9607C04B2235/9676
Inventor 曾立民查新光肖亘
Owner HUNAN XIANGGANG RUITAI TECH
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