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Castable for blast furnace tapping trough and preparation method thereof

A technology of blast furnace iron casting and castables, which is applied in the field of refractory castables, can solve the problems of water vapor that cannot be eliminated, damage the environment to the body, and poor oxidation resistance, achieve excellent thermal shock stability and slag erosion resistance, and reduce toxicity Smoke, good performance effects

Active Publication Date: 2016-01-20
JIANGSU REFUTA NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because carbon has good impermeability and spalling resistance, it can reduce the dissolution and erosion of materials by molten iron slag. Most of the traditional refractory materials for blast furnace iron trenches use spherical pitch as the carbon source, but spherical pitch is on the one hand. Toxic smoke will be released during the baking process, forming yellow smoke, causing personal injury and environmental pollution. Secondly, the carbon in the castable mainly comes from the residual carbon after asphalt pyrolysis, which has a small content and poor oxidation resistance; finally, Spherical asphalt is easy to soften during the baking process of the castable, and it is easy to block the pores, resulting in water vapor that cannot be removed, and eventually causes bursting during baking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0026]A castable for a blast furnace tapping trough, the raw materials and percentages of the castable are: 59wt.% for fused brown corundum, 21wt.% for silicon carbide, and 0.05wt.% for commercially available single-walled carbon nanotubes , 7wt.% of α-alumina micropowder, 5wt.% of fused white corundum, 4wt.% of silica micropowder, 2wt.% of calcium aluminate cement, 1.15wt% of simple silica fume, sodium naphthalenesulfonate formaldehyde condensation 0.30wt.% for sodium hexametaphosphate, 0.2wt.% for polypropylene fiber, and 0.1wt.% for aluminum powder.

[0027] According to the above raw materials and their percentage content, dry mix for 30~60s, then add 4~5wt.% water of the above raw materials, and stir for 3~5min.

[0028] The castables for blast furnace tapholes prepared in this example were tested after heat treatment at 110°C×24h and 1450°C×3h: the room temperature flexural strengths were 11.0-15.1MPa and 17.2-25.3MPa respectively, and the room temperature pressure resis...

Embodiment 2）

[0030] A casting material for a blast furnace tapping channel. The raw materials and percentages of the casting material are: 60wt.% of fused brown corundum, 19.8wt.% of silicon carbide, and 0.03wt.% of spherical pitch. Wall carbon nanotubes are 2.47wt.%, α-alumina micropowder is 4wt.%, fused white corundum is 5wt.%, silicon micropowder is 3wt.%, calcium aluminate cement is 3wt.%, and elemental silicon powder is 2wt. %, sodium naphthalenesulfonate formaldehyde condensate is 0.2wt.%, sodium hexametaphosphate is 0.1wt.%, polyethylene fiber is 0.2wt.%, aluminum powder is 0.2wt.%.

[0031] According to the above raw materials and their percentage content, dry mix for 30~60s, then add 4~5wt.% water of the above raw materials, and stir for 3~5min.

[0032] The castables for blast furnace tapping troughs prepared in this example were tested after heat treatment at 110°C×24h and 1450°C×3h: the room temperature flexural strengths were 11.1-15.4MPa and 17.3-25.5MPa respectively, and the...

Embodiment 3）

[0034] A castable for a blast furnace tap trough. The raw materials and percentages of the castable are: 65wt.% of fused brown corundum, 15wt.% of silicon carbide, and 0.1wt.% of spherical pitch. Commercially available multi-wall 0.3wt.% for carbon nanotubes, 7wt.% for α-alumina micropowder, 3.55wt.% for fused white corundum, 0.5wt.% for silica micropowder, 5wt.% for calcium aluminate cement, and 5wt.% for simple silicon powder 3wt%, sodium naphthalenesulfonate formaldehyde condensate 0.15wt.%, sodium tripolyphosphate 0.2wt.%, polyester fiber and polypropylene fiber mixture 0.15wt.%, aluminum powder 0.05wt.%.

[0035] According to the above raw materials and their percentage content, dry mix for 60~90s, then add 4~5wt.% water of the above raw materials, and stir for 5~6min.

[0036] The castables for blast furnace tapholes prepared in this example were tested after heat treatment at 110°C×24h and 1450°C×3h: the room temperature flexural strengths were 11.5-16.0MPa and 19.0-26....

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Abstract

The invention belongs to the technical field of a refractory castable, and particularly relates to a castable for a blast-furnace tapping channel and a preparation method thereof. The castable comprises the following components: 55-80wt% of fused brown corundum, 8-21wt% of silicon carbide, 0.01-5wt% of carbon source, 2-8wt% of alpha-alumina micro powder, 1-7wt% of fused white corundum, 0.5-5wt% of silica powder, 1-5wt% of calcium aluminate cement, 0.3-4wt% of elemental silicon powder, 0.01-0.4wt% of water reducing agent, 0-0.2wt% of organic fibers and 0-0.2wt% of aluminum powder. The preparation method comprises the steps of dry-blending the components for 10-180 seconds, additionally adding water accounting for 4-6wt% of the raw materials, and stirring for 1-8 minutes so as to obtain the castable. Carbon nanotubes are introduced to the castable for the tapping channel so as to partially or totally replace spherical asphalt and be uniformly distributed in the castable, and can be filled into tiny gaps so as to improve the compactness of the castable, so that the anti-erosion and anti-scouring properties of the castable are improved, toxic smog formed in the process of baking the spherical asphalt is reduced, and the body injury of workers and the environmental pollution caused by the toxic smog are reduced; the castable has the characteristics of excellent properties, long service life and environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of refractory castables, and in particular relates to a castable for a blast furnace tapping trough and a 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, ironmaking blast furnaces will develop towards large scale (volume 2500m 3 Above), the amount and speed of tapping iron increase, coupled with the high-temperature air supply and high-pressure operation adopted, the temperature of tapping iron rises, resulting in more stringent conditions for the use of the iron trough, which undoubtedly increases the efficiency and longevity of the blast furnace Difficulty of transformation. Blast furnace tapping trough is an important part of blast furnace production. It is a channel to guide high-temperature molten iron and slag. Its refractory lining is repea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 苏党生李连地宋学斌
Owner JIANGSU REFUTA NEW MATERIALS CO LTD
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