Castable for blast-furnace tapping channel and preparation method thereof

[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 resistan

[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 ro

[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 19.0-26.5MP