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Novel semi-graphitization silicon nitride carbide brick and its production method

A technology of silicon carbonitride bricks and semi-graphitization, applied in the field of refractory materials and their production, can solve the problems of low strength, thermal shock spalling, poor cooling effect, etc., and achieve the effect of improving economic efficiency and prolonging life.

Inactive Publication Date: 2008-06-25
郑州华宇高炉工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to their low thermal conductivity (≤15w / m.k), the cooling effect is poor, the thermal stress is large, and thermal shock spalling is prone to occur. The combined water vapor-alkali corrosion also leads to the oxidative decomposition of these refractory materials.
There are also cases where semi-graphite or graphite products are used in this part of the blast furnace. At this time, although the high thermal conductivity of these materials solves the problem of cooling effect and thermal shock, they have low strength, easy oxidation and low alkali resistance Still not getting the expected liner life

Method used

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  • Novel semi-graphitization silicon nitride carbide brick and its production method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: Weigh 20% of electrically calcined anthracite with a particle size of 0.074 to 10mm, 40% of graphite with a particle size of 0.074 to 3mm, 30% of industrial silicon with a particle size of not more than 320 mesh, and carbonized carbonized coal with a particle size of 0.074 to 2.5mm by weight percentage. 10% of silicon is put into the mixer, plus 20% of the total weight of the above raw materials is thermosetting phenolic resin,

[0027] After the raw materials are mixed evenly, they are pressed and molded, dried and put into a kiln. Nitrogen gas with a pressure of 0.15 MPa is filled in the firing kiln, and the temperature is kept at 1200°C for 24 hours. The product is cooled out of the kiln.

[0028] After the products are out of the kiln, their physical and chemical properties, surface quality and external dimensions are inspected; the products that pass the inspection are processed according to the size standards or contract requirements; finally, the pro...

Embodiment 2

[0029] Embodiment two: basically the same as embodiment one, the similarity is no longer described, and the difference is:

[0030] Weigh raw materials according to the formula: 50% of electric calcined anthracite with a particle size of 0.074-10mm, 20% of graphite with a particle size of 0.074-3mm, 15% of industrial silicon with a particle size of no more than 320 mesh, 15% of silicon carbide with a particle size of 0.074-2.5mm, Put into mixer, add the thermosetting phenolic resin that accounts for 20% of above-mentioned raw material gross weight,

[0031] After mixing evenly, it is pressed into shape, dried and loaded into a kiln, filled with nitrogen at a pressure of 0.2 MPa, kept at 1800°C for 8 hours and fired, and the product is cooled out of the kiln.

Embodiment 3

[0032] Embodiment three: basically the same as embodiment one, the similarity is no longer described, and the difference is:

[0033] Weigh raw materials according to the formula: 30% of electric calcined anthracite with a particle size of 0.074-10mm, 30% of graphite with a particle size of 0.074-3mm, 30% of industrial silicon with a particle size of no more than 320 mesh, 10% of silicon carbide with a particle size of 0.074-2.5mm, Put it into a mixer, add resin accounting for 17% of the total weight of the above raw materials, mix evenly, press and shape, dry and put it into a kiln, fill the firing kiln with nitrogen at a pressure of 1.0MPa, and heat it at 1300 ° C The temperature is kept for 10 hours and fired, and the product is cooled out of the kiln with the furnace.

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Abstract

The invention relates the fire resistive material and the preparing method, especially the new pattern graphitization silicon carbide nitride brick and its preparing method. The material comprises 20-50wt% anthracite coal, 20-40wt% graphite, 15-30wt% industrial silicon, 10-30wt% silicon carbide, and 7-20wt% binding agent. The method comprises the following steps: mixing the raw material and binding agent, press forming, drying, and baking them at 1200-1800Deg.C for 8-24 hours at the atmosphere of nitrogen, and charging 0.1MPa nitrogen into calcining kiln. The invention has the advantages of good opposing iron and alkali metal corrosion capability, good heat conductivity, high thermal conductivity factor which above 30 w / m.k, and good earthquake resistance and high machinery strength. The invention can be used in furnace bottom, furnace hearth and inside lining from breast to shaft, extending the durability, and improving economic benefit.

Description

1. Technical field: [0001] The invention relates to a refractory material and a production method thereof, in particular to a semi-graphitized silicon carbonitride brick and a production method thereof. 2. Background technology: [0002] In order to obtain the longest possible blast furnace life under high-efficiency production conditions in the modern blast furnace ironmaking industry, thereby obtaining considerable economic benefits, microporous carbon bricks are generally used in the hearth containing molten iron and the working layer of the furnace bottom lining. Silicon nitride bonded silicon carbide bricks, sialon bonded corundum bricks or semi-graphite and graphite products are built from the bosh to the lower part of the furnace body. At present, the microporous carbon bricks used in the furnace bottom and the working layer of the hearth have technical characteristics such as good microporosity and a thermal conductivity of 14-20w / m.k. During use, it can better preve...

Claims

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Application Information

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IPC IPC(8): C04B35/52C04B35/632C04B35/622
Inventor 白继周聂桂秋白建伟王培茹
Owner 郑州华宇高炉工程技术有限公司
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