Carbon-free alumina-magnesia unburned brick and preparation method and application thereof

A technology of aluminum-magnesium and fused magnesia, which is applied in the fields of carbon-free aluminum-magnesium non-burning bricks, preparation and application, can solve the problems of unfavorable high-temperature use performance of refractory materials, inconvenient on-site production management, and affecting the normal pouring of molten steel, etc. Enhances overall corrosion resistance, excellent slag resistance, good high temperature strength and softening temperature under load

Inactive Publication Date: 2013-05-08
上海柯瑞冶金炉料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the refractory materials in the molten iron area of ​​the refining ladle are mainly shaped aluminum-magnesium-carbon bricks and aluminum-magnesium castables. Because the aluminum-magnesia-carbon bricks contain a relatively high content of carbon, it is easy to cause carburization of the molten steel, and the thermal conductivity is high. 10-20W / (m·K), the heat transfer is fast, the heat loss is too large, which affects the normal pouring of molten steel and thus limits its use; aluminum-magnesium castables are prone to occurrence due to high quality control requirements for pouring and baking. Unsafe events such as baking cracks and local abnormal ring damage are not convenient for on-site production management, and SiO in aluminum-magnesium castables 2 The content is usually high, so at high temperature, it is easy to combine with Al 2 o 3 , MgO, CaO and other components form low-melting materials, which is unfavorable to the high-temperature performance of refractory materials. Its high-temperature strength and load softening temperature will decrease, and its corrosion resistance is poor, so it has a certain impact on service life.

Method used

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  • Carbon-free alumina-magnesia unburned brick and preparation method and application thereof
  • Carbon-free alumina-magnesia unburned brick and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Provide aluminum-magnesium unfired bricks containing Al 2 o 3 Mass percent is 89.58, MgO is 6.51, P2 o 5 The specific proportion is 12% of 5-3mm fused corundum sand, 38% of 3-1mm fused corundum sand, 22% of ≤1mm fused corundum sand, 12% of ≤88μm fused corundum sand, and ≤1mm fused magnesia 4%, ≤25μm magnesium oxide powder 3%, ≤6μm alumina superfine powder 7.5%, plasticizer 1%, wetting agent 0.5%, compound sodium hexametaphosphate solution 4.2% (additional), after weighing according to the formula , produced according to the production process and ready for use.

Embodiment 2

[0047] Provide aluminum-magnesium unfired bricks containing Al 2 o 3 Mass percent is 88.21, MgO is 5.23, P 2 o 5 The specific ratio of 1.18 is 5-3mm fused corundum sand 22%, 3-1mm fused corundum sand 30%, ≤1mm fused corundum sand 22%, ≤88μm fused corundum sand 8%, ≤1mm fused magnesia 2%, ≤25μm magnesium oxide powder 11%, ≤6μm alumina superfine powder 10%, plasticizer 1%, wetting agent 1%, compound sodium hexametaphosphate solution 4% (additional), after weighing according to the formula , produced according to the production process and ready for use.

[0048] The tested indicators are as follows in Table 2:

[0049] project

[0050] Flexural strength MPa

[0051] The plasticizer or wetting agent used in Examples 1 and 2 can be one or any two of those described in the Summary of the Invention.

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Abstract

The invention relates to a carbon-free alumina-magnesia unburned brick and a preparation method and application thereof. The carbon-free alumina-magnesia unburned brick is characterized by comprising particle size distribution electro-fused white corundum, electro-fused magnesite, magnesia micro powder, alumina ultramicro powder and a small amount of plasticizer and wetting agent. The unburned brick is applied to 300-ton refined steel ladles and has high heat-insulating property, and the service life of the steel ladles exceeds that (90 to 100 furnaces) of the conventional alumina-magnesia brick greatly.

Description

technical field [0001] The present invention relates to a carbon-free aluminum-magnesium unburned brick, its preparation method and its application. More precisely, the invention relates to a high-quality variety of clean steel smelting ladle lining working layer molten iron zone refractory aluminum-magnesium unburned brick, Preparation method and application, especially related to a kind of carbon-free magnesia unfired brick, which is prepared by gradation and preparation of superfine powder particles such as fused corundum sand, fused magnesia, pre-synthesized fused spinel sand, alumina, etc. made. It belongs to the field of refractories for smelting high-quality crystalline steel. Background technique [0002] With the continuous improvement of the market's quality requirements for steel products, the technical level of the modern steel industry must continue to improve. Low-carbon and ultra-low-carbon clean steel has become the focus of development. Among them, the ladl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/101C21C7/10
Inventor 何晓俊刑建辉王礼玮赵玲娣许虹杰
Owner 上海柯瑞冶金炉料有限公司
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