Refractory castable for blast furnace tapping trough and preparation method thereof

Abstract

The invention relates to a fireproof castable for producing blast furnace iron runners and a preparation method thereof. The castable is composed of the following raw materials in percentage by weight: 15 to 30 wt% of high-alumina bauxite, 5 to 20 wt% of titanium-iron alloy slag, 24 to 36 wt% of fused white corundum, 10 to 16 wt% of silicon carbide, 7 to 13 wt% of alumina micropowder, 2 to 5 wt% of silicon micropowder, 2 to 5 wt% of silicon powder, 2 to 5 wt% of calcium aluminate cement, and 2 to 5 wt% of spherical asphalt. The preparation method comprises the following steps: preparing the raw materials mentioned above, adding an FDN naphthalene water reducer accounting for 0.01 to 0.07 wt% of the total weight of raw materials, sodium tripolyphosphate accounting for 0.03 to 0.12 wt% of the total weight of raw materials, and aluminum powder accounting for 0.05 to 0.2 wt% of the total weight of raw materials, carrying out dry-mixing for 1 to 3 minutes, then adding water accounting for 4 to 5.5 wt% of the total weight of raw materials, and mixing for 3 to 7 minutes so as to obtain the fireproof castable. The provided fireproof castable has the characteristics of simple technology, low production cost, recyclable raw materials, and no special requirement on equipment, and has the advantages of stable volume, high strength, excellent corrosion resistant performance, and long service life.

Description

technical field [0001] The invention relates to a refractory pouring material. In particular, it relates to a refractory castable for a blast furnace tapping trough and a preparation method thereof. Background technique [0002] With the development of large-scale and long-life blast furnaces and the increase in ironmaking output of blast furnaces, the service life requirements for refractory materials used in blast furnaces are getting higher and higher. The blast furnace tapping trough is the channel that guides the high-temperature molten iron and slag to flow from the furnace to the molten iron tank through the tap hole. The performance of the castable for the tapping trough directly determines the service life of the tapping trough, thereby determining the production capacity and efficiency of the blast furnace. high and low. [0003] Because the refractory materials used in the tap trough are directly scoured by the high temperature of molten iron and slag, mechanica...

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Problems solved by technology

[0003] Because the refractory materials used in the tap trough are directly scoured by the high temperature of molten iron and slag, mechanical wear and chemical erosion, and also affected by the comprehensive effects of sharp changes in temperature gradient or long-term high temperature (Hu Wenqiang, Wei Hangyu. No. 5 blast furnace iron in Handan Iron and Steel Gully erosion and production maintenance[J]. Nanfang Metallurgy. 2015(1):43-48), intensified the penetration and erosion of molten iron and slag into refractory materials, resulting in structural damage, accelerated melting loss rate, shortened service life, and reduced traffic flow. iron content

"Blast Furnace Tap Tunnel Castable" (CN102775165A) patented technology, the castable is composed of alumina, sintered tabular alumina, andalusite, alumina hollow balls, fused zirconia, alumina micropowder and ferrosilicon nitride, etc. Composition of raw materials, although this castable with bauxite as the main component has a lower melting loss rate and a longer service life than ordinary castables.