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Chromium corundum-silicon carbide-carbon castable for iron troughs

A technology of silicon carbide and chromium corundum, which is applied in the field of castables for blast furnace tap hooks, can solve problems such as poor erosion resistance and corrosion resistance of iron trench materials, low service life of hook linings, and influence of tap hook castables , to achieve good thermal shock stability, good erosion resistance, and reduce enterprise costs

Pending Publication Date: 2017-07-11
上海新泰山高温工程材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early days, iron gutters were generally made of coke, clay clinker and other raw materials by manual ramming, but this kind of iron hook lining has a low service life and a small amount of iron.
In the 1970s, began to research, develop and use Al 2 o 3 -SiC-C castable, Al 2 o 3 Brown corundum and high-alumina bauxite clinker are mostly used, but this iron channel material is not strong in erosion resistance and erosion resistance
With the development of large-scale, long-life, and high-temperature and high-pressure blast furnaces, the temperature of molten iron will increase, the amount of iron tapping will increase, the time of tapping iron will be prolonged, and the flow rate of molten iron will increase, which will lead to traditional Al 2 o 3 -SiC-C tapping hook castables are seriously affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 71% chrome corundum, 15% silicon carbide, 2.5% spherical pitch, 5% α-Al 2 o 3 Micropowder, 2% silicon micropowder, 3% binder, 1.5% composite antioxidant; then weigh 3% composite admixture, and then add the composite admixture. First, pre-mix all the additives except chrome corundum with a roller machine for 60 minutes. After pre-mixing, add the chrome corundum to the mixer and dry-mix for 10 minutes, then add the pre-mixed materials and dry-mix for 20 minutes. , and finally add water accounting for 4.6% of the total weight of the castable, stir for 5 minutes, vibrate and cast into a sample of 40mm×40mm×160mm, remove the mold after curing at room temperature for 24 hours, bake at 110°C for 24 hours, and finally raise the temperature to 1450°C °C and keep warm for 3 hours.

[0017] The chromium corundum-silicon carbide-carbon tap hook castable prepared in Example 1 has a bulk density of 3.20 g / cm after being dried at 110°C for 24 hours. 3 , the flexural strength ...

Embodiment 2

[0019] Weigh 63% chrome corundum, 20% silicon carbide, 2% spherical pitch, 7% α-Al 2 o 3 Micropowder, 3% silicon micropowder, 4% binding agent, 1% composite antioxidant; then weigh 4.2% composite admixture, and add the composite admixture at this time. First, pre-mix all the additives except chrome corundum with a roller machine for 60 minutes. After pre-mixing, add the chrome corundum to the mixer and dry-mix for 10 minutes, then add the pre-mixed materials and dry-mix for 20 minutes. , and finally add water accounting for 5.4% of the total weight of the castable, stir for 5 minutes, vibrate and cast into a sample of 40mm×40mm×160mm, remove the mold after curing at room temperature for 24 hours, bake at 110°C for 24 hours, and finally raise the temperature to 1450°C °C and keep warm for 3 hours.

[0020] The chromium corundum-silicon carbide-carbon tap hook castable prepared in Example 2 has a bulk density of 3.16g / cm2 after being dried at 110°C for 24 hours. 3 , the flexu...

Embodiment 3

[0022] Weigh 55% chrome corundum, 25% silicon carbide, 1.5% spherical pitch, 9% α-Al 2 o 3 Micropowder, 4% silicon micropowder, 5% binding agent, 0.5% composite antioxidant; then weigh 3.6% composite admixture, and then add the composite admixture. First, pre-mix all the additives except chrome corundum with a roller machine for 60 minutes. After pre-mixing, add the chrome corundum to the mixer and dry-mix for 10 minutes, then add the pre-mixed materials and dry-mix for 20 minutes. , and finally add water accounting for 5% of the total weight of the castable, stir for 5 minutes, vibrate and cast into a sample of 40mm×40mm×160mm, remove the mold after curing at room temperature for 24 hours, bake at 110°C for 24 hours, and finally raise the temperature to 1450°C ℃ and keep warm for 3 hours

[0023] The chromium corundum-silicon carbide-carbon tap hook castable prepared in Example 3 has a bulk density of 3.11 g cm after being dried at 110°C for 24 hours. 3 , the flexural stre...

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Abstract

The invention relates to a chromium corundum-silicon carbide-carbon castable for iron troughs. The castable comprises, by mass, 45-75 % of chrome corundum, 10-30 % of silicon carbide, 1-6% of spherical asphalt, 1-10% of alpha-Al2O3 powder, 1-5% of silicon micro-powder, 1-7% of a binder, 0.1-2% of a composite antioxidant and 2-6% of a composite additive. The prepared castable for iron troughs has the characteristics of good erosion resistance, good wear resistance, good thermal shock stability, high erosion resistance and long service life, and can increase the iron influx of blast furnace iron troughs in order to reduce consumption of a refractory material.

Description

technical field [0001] The invention belongs to the field of blast furnace tapping hook castables, in particular to a chromium corundum-silicon carbide-carbon tapping hook castable. Background technique [0002] The blast furnace tapping hook is a channel for high-temperature molten iron and slag. The iron hook castable is a kind of amorphous refractory material used in the blast furnace tapping hook. The performance, service life and iron flow of the iron hook castable are directly Affect the production cost of enterprises and the labor intensity of workers. In the early days, the iron gutters were generally made of coke, clay clinker and other raw materials by manual ramming, but the service life of the iron hook lining was low and the amount of iron passing through was small. In the 1970s, began to research, develop and use Al 2 o 3 -SiC-C castable, Al 2 o 3 Brown corundum and high-alumina bauxite clinker are mostly used, but this iron channel material is not strong ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/105
CPCC04B35/105C04B2235/77C04B2235/96C04B2235/3222C04B2235/3418C04B2235/3826C04B2235/402C04B2235/447C04B2235/428
Inventor 马四凯李洪波李维锋颜浩邹新国
Owner 上海新泰山高温工程材料有限公司
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