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Steel-bag aluminum-magnesium fire clay of electric furnace

A technology of electric furnace steel and fire clay, which is applied in the field of refractory materials, can solve the problems of poor slag erosion resistance and melting loss, melting loss, etc., and achieve the goal of improving high temperature strength, high strength, and improving slag erosion resistance and permeability Effect

Active Publication Date: 2009-11-11
上海彭浦特种耐火材料厂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, "95 magnesium fire clay" has poor slag resistance and melting loss due to excessive high-temperature shrinkage, and "sag" melting loss occurs in the later stage of ladle use.

Method used

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  • Steel-bag aluminum-magnesium fire clay of electric furnace
  • Steel-bag aluminum-magnesium fire clay of electric furnace

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] It is prepared according to 80% of fused magnesia ≤ 200 mesh, 12% of aluminum oxide, 4% of chromium oxide powder, 2% of wood calcium, 1.5% of carboxymethyl cellulose and 0.5% of sodium tripolyphosphate. First mix magnesia and alumina, then add Cr 2 o 3 Powder, mix for 3-5 minutes first, then add wood calcium, carboxymethyl cellulose and sodium tripolyphosphate and continue mixing for 8-10 minutes, and mix evenly.

[0036] The static crucible method was used to carry out the comparative test of slag resistance. 95 pure magnesia fire clay and electric furnace ladle magnesium-aluminum fire clay are respectively made into anti-slag samples, and 50 grams of ladle slag (CaO / SiO2 The ratio is 2), put it into an electric furnace at 1600°C for 3h to carry out the slag resistance test. After naturally cooling to room temperature, take out the sample, take out the residual ladle slag and weigh it, and cut the anti-slag sample longitudinally along the center line (see figure 1 )...

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Abstract

The invention relates to an electric furnace ladle magnesium-aluminum fire clay, which is characterized in that the fire clay is composed of: 75-85% of fused magnesia, 10-15% of alumina powder, 1-5% of chromium oxide powder, Wood calcium 1-5%, carboxymethyl cellulose 1-5%, and sodium tripolyphosphate 0.1-0.5%. In the present invention, MgO·Al2O3 and MgO·Cr2O3 composite spinel phases are generated at high temperature in the matrix, accompanied by a certain volume expansion, which partially offsets the shrinkage generated during sintering during use, increases the initial liquid phase temperature and forms a Good high temperature performance and metal oxide melt resistant structure to improve slag erosion resistance and permeability.

Description

technical field [0001] The invention relates to an electric furnace ladle magnesium-aluminum fire clay resistant to high-temperature melting loss, penetration and erosion, which is used to replace the traditional form of two kinds of fire clay mixed masonry ladles. It belongs to the field of refractory materials. Background technique [0002] According to literature review, domestic and foreign technical product reports on relevant ladles mainly include refractory mud for ladles such as aluminum-magnesium, aluminum, and magnesium. "Development and application of aluminum-magnesium fire clay for steel ladle" reports that the aluminum-magnesium fire clay for steel ladle prepared by calcined super-grade bauxite clinker, high-quality sintered magnesia, Guangxi white clay and appropriate amount of admixture has the advantages of convenient construction and brick lining. The characteristics of strong bonding and excellent corrosion resistance ensure the normal promotion and use o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/04
Inventor 张海萍杨瑞德王礼玮
Owner 上海彭浦特种耐火材料厂有限公司