Al2O3-SiC-C iron runner casting material and preparation method thereof

Abstract

The invention particularly relates to an Al2O3-SiC-C iron runner casting material and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: carrying out uniform dry mixing on raw materials 50-60 wt% of electrofused brown corundum granules, 8-12 wt% of electrofused brown corundum fine powder, 3-10 wt% of silicon carbide granules, 6-11 wt% of silicon carbide fine powder, 3-7 wt% of alpha-Al2O3 micropowder, 2-4 wt% of pelleted pitch, 2-4 wt% of silicon dioxide micropowder, 2-4 wt% of calcium aluminate cement, 2-4 wt% of metal antioxidant and 0.1-0.3 wt% of dispersant together with catalyst accounting for 0.1-3 wt% of the raw materials to obtain the Al2O3-SiC-C iron runner casting material. The invention has the advantage of low preparation cost; and the prepared Al2O3-SiC-C iron runner casting material has the advantages of low water addition amount, high flow value, favorable high-temperature service performance and high thermal shock stability, and so that the blast furnace iron runner has high iron flux and low refractory material consumption.

Description

technical field [0001] The invention belongs to the technical field of iron ditch castables. Concretely involving an Al 2 o 3 - SiC-C iron ditch castable and preparation method thereof. Background technique [0002] In recent years, with the development of blast furnace smelting technology, the smelting intensity has been continuously increased. In 2011, the national blast furnace pig iron has reached 628 million tons, and the consumption of refractory materials in blast furnace iron trough is relatively large. Al 2 o 3 -SiC-C castable has the characteristics of high strength, erosion resistance, thermal shock resistance and long service life. At the same time, the high thermal conductivity, low expansion rate and slag non-wetting of carbon and silicon carbide all endow this material system with good performance. Physical and chemical properties, so it is widely used in blast furnace tapping trough system. At present, the volume of the blast furnace continues to increa...

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Problems solved by technology

For example, the patented technology of "a new type of main iron ditch castable" (CN201110044222.X) discloses the use of modified nano-carbon powder to replace asphalt, improve its oxidation resistance and carbon residue rate, and also improve the anti-burst performance during baking. However, the thermal shock resistance is not ideal; "a type greater than 2500m 3 "Blast Furnace Main Trough Castable" (CN201210281186.3) patented technology, which discloses the addition of zinc-aluminum spinel powder, nano-sized zirconium silicate, and zirconia hollow spheres, and uses silica sol suspension as a nano-bonding agent to improve the pouring efficiency. The thermal shock stability of the material, but the cost has also increased a lot accordingly, and the anti-oxidation has not been well solved; Graphite partially replaces spherical pitch to improve its oxidation resistance and reduce environmental pollution, but the high temperature flexural strength is correspondingly reduced

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