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Al2O3-SiC-C castable used for blast furnace iron tapping channel and preparation method thereof

An al2o3-sic-c, blast furnace tapping technology, applied in the field of refractory castables, can solve the problems of high price, unfavorable industrial promotion and application, etc., and achieve the effects of long service life, high corrosion resistance and oxidation resistance

Inactive Publication Date: 2012-03-28
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These studies have added non-oxides including Sialon, Si 3 N 4 、B 4 Compounds such as C to increase Al 2 o 3 - The oxidation resistance of SiC-C castables can improve the service life, but these non-oxides are artificially synthesized, and the price is relatively expensive, which is not conducive to industrial promotion and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A kind of Al 2 o 3 -SiC-C casting material and preparation method thereof. The raw materials and percentages of the castable are: dense corundum 26-34wt%, white corundum 28-33wt%, silicon carbide 10-12wt%, titanium dioxide 4-5wt%, α-Al 2 o 3 The content of fine powder is 9-10 wt%, the content of silicon micro-powder is 4-5 wt%, the content of elemental silicon powder is 4-5 wt%, the content of spherical asphalt is 4-5 wt%, and the content of aluminate cement is 3-4 wt%.

[0016] According to the above raw materials and their percentage content, add 0.05-0.1wt% aluminum powder and 0.05-0.1wt% sodium polyacrylate of the above-mentioned raw materials, dry mix for 10-20s, and then add 4-5wt% water of the above-mentioned raw materials, Stir for 4-6 minutes.

[0017] The Al 2 o 3 -SiC-C castables, after heat treatment at 110℃×24h and 1450℃×3h, after testing: the room temperature flexural strength is 11.5~14MPa and 17~23MPa, and the room temperature compressive strength ...

Embodiment 2

[0019] A kind of Al 2 o 3 -SiC-C casting material and preparation method thereof. The raw materials and percentages of the castable are: dense corundum 34-42wt%, white corundum 23-28wt%, silicon carbide 14-16wt%, titanium dioxide 2-3wt%, α-Al 2 o 3 The micropowder is 7-8wt%, the silicon micropowder is 3-4wt%, the elemental silicon powder is 2-3wt%, the spherical asphalt is 3-4wt%, and the aluminate cement is 4-5wt%.

[0020]According to the above-mentioned raw materials and their percentages, add 0.1-0.15wt% metal aluminum powder and 0.1-0.15wt% sodium polyacrylate of the above-mentioned raw materials, dry mix for 20-30s, and then add 5-6wt% of the above-mentioned raw materials. Water, Stir for 5-7 minutes.

[0021] The Al 2 o 3 -SiC-C castable, tested after heat treatment at 110℃×24h and 1450℃×3h: room temperature flexural strength is 11~13.8MPa and 16~22MPa; room temperature compressive strength is 63~75MPa and 118~151MPa ;The bulk density is 2.93~3.02g / cm 3 and 2.9~...

Embodiment 3

[0023] A kind of Al 2 o 3 -SiC-C casting material and preparation method thereof. The raw materials and percentages of the castable are: dense corundum 42-50wt%, white corundum 18-23wt%, silicon carbide 12-14wt%, titanium dioxide 3-4wt%, α-Al 2 o 3 The micropowder is 8-9wt%, the silicon micropowder is 2-3wt%, the elemental silicon powder is 3-4wt%, the spherical asphalt is 2-3wt%, and the aluminate cement is 2-3wt%.

[0024] According to the above-mentioned raw materials and their percentages, add 0.15-0.2wt% aluminum powder and 0.15-0.2wt% sodium polyacrylate of the above-mentioned raw materials, dry mix for 30-40s, and then add 5-6wt% water of the above-mentioned raw materials, Stir for 6-8 minutes.

[0025] The Al 2 o 3 -SiC-C castable, after heat treatment at 110℃×24h and 1450℃×3h, after testing: room temperature flexural strength is 11.2~13.5MPa and 18~23MPa; room temperature compressive strength is 65~72MPa and 120~150MPa ;The bulk density is 2.9~3.0g / cm 3 and 2....

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Abstract

The invention relates to Al2O3-SiC-C castable used for a blast furnace iron tapping channel and a preparation method thereof. The invention adopts the technical scheme that the castable is prepared from the following raw materials in percent by weight: 26-50wt% of compact corundum, 18-33wt% of white corundum, 10-16wt% of silicon carbide, 2-5wt% of titanium dioxide, 7-10wt% of alpha-Al2O3 micro powder, 2-5wt% of silicon micro powder, 2-5wt% of simple substance silicon powder, 2-5wt% of spherical asphalt and 2-5wt% of aluminate cement. The raw materials are blended in the percentage composition, metal aluminium powder accounting for 0.05-0.2wt% of the raw materials and sodium polyacrylate accounting for 0.05-0.2wt% of the raw materials are additionally added, dry mixing is carried out for 10-40 seconds, then water accounting for 4-6wt% of the raw materials is additionally added, and stirring is carried out for 4-8 minutes. The Al2O3-SiC-C castable used for a blast furnace iron tapping channel prepared by the invention has the characteristics of high thermal shock stability, high erosion resistance and high oxidation resistance, and service life is long.

Description

technical field [0001] The invention belongs to the technical field of refractory castables, and in particular relates to an Al 2 o 3 -SiC-C casting material and preparation method thereof. Background technique [0002] my country's blast furnace ironmaking process will still dominate for a period of time, and with the continuous advancement of metallurgical technology, blast furnaces will continue to develop in the direction of large-scale, high-efficiency, and long-life. higher requirement. Blast furnace tapping channel is an important part of blast furnace production. According to statistics, in the unit consumption of molten iron refractory materials, unshaped refractory materials (refractory materials and gun mud for blast furnace tapping channel) used in casting houses account for about 71%. The sum of the construction and maintenance costs of the tapping channel and the price of gun mud during the first generation of blast furnace is higher than the cost of building...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 尹玉成梁永和葛山刘志强逯久昌聂建华李维锋崔任渠
Owner WUHAN UNIV OF SCI & TECH
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