Method for preparing cast material of AL2O3-SiC-Ciron runner

An iron channel castable, al2o3-sic-c technology, applied in the field of refractory materials, can solve the problems of difficult sintering and recrystallization, etc., and achieve the effects of easy construction, enhanced resistance to slag penetration, and high strength

Inactive Publication Date: 2005-08-31
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

However, since Al 2 o 3 - SiC introduced into SiC-C materials is a covalent compound with strong bonds prepared by electrofusion method. It is difficult to sinter and recrystallize under the conditions of use, and it still exists in an isolated state in the material; the commonly used CaO in cement binder an...

Method used

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Embodiment 1

[0014] Embodiment 1 The present invention Al 2 o 3 - The preparation method of SiC-C iron channel castable is that the weight ratio of its components is: Al 2 o 3 Fused dense corundum with content ≥98% is 70-75%, SiC with SiC content ≥95% is 10-15%, Al 2 o 3 Content ≥ 99.4% Ultrafine powder is 6-10%, high-alumina cement is 1-2%, Si 3 N 4 Content ≥ 90% Silicon nitride 10-12%, metal silicon 9-11%, dispersant 0.1-0.3%.

[0015] The particle size of each component is: dense corundum 8-5mm, 5-3mm, 3-1mm, ≤1mm, ≤0.045mm, SiC ≤1mm, silicon nitride ≤0.045mm, metal silicon ≤0.045mm. The particle gradation of fused dense corundum is 10-20%.

[0016] Add about 5% water to the mixture according to the above ratio, stir for 3 minutes, cast it, then dry it at 110°C for 24 hours, and then burn it at 1000°C for 3 hours and 1450°C for 3 hours. Test its performance, the results are shown in the attached table.

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Abstract

A process for preparing Al2O3-SiC-C refractory used for the tapping runner of blast furnace includes proportionally mixing electro-corundum, SiC, corundum powder, superfine powder, high-Al cement, silicon nitride, metallic silicon, disperser and water, casting, curing and drying.

Description

1. Technical field [0001] The invention belongs to the field of refractory materials. In particular, it relates to a method for preparing a refractory material for a blast furnace tapping trough. 2. Background technology [0002] The iron trough is a channel used to transport molten iron from the blast furnace to the ladle. During use, the inner lining of the iron ditch is subjected to the severe erosion of the ditch lining by the flowing high-temperature molten iron and slag, as well as the chemical erosion of the inner lining by the high-temperature slag, the penetration of molten iron, and the temperature suddenness of intermittent tapping and slag tapping. The cold and heat impact on the inner lining will cause cracks in the ditch lining. Therefore, it is generally required that the iron ditch lining refractory material has high high-temperature mechanical strength, good chemical corrosion resistance of slag and molten iron, strong oxidation resistance, and good therma...

Claims

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Application Information

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IPC IPC(8): C04B35/103C21B7/14
Inventor 顾华志汪厚植张文杰吴峰董西岳吕春燕
Owner WUHAN UNIV OF SCI & TECH
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