Fast-baking explosion proof type refractory castable for blast furnace iron runner

Abstract

The invention relates to a fast-baking explosion proof type refractory castable for blast furnace iron runner, which belongs to the field of a refractory matter. The fast-baking explosion proof type refractory castable comprises a main material and an additive, wherein the main material comprises the following ingredients by mass percent: 50-70% of high alumina granules, 10-26% of high alumina fine powder, 10-25% of silicon carbide, 1-3% of silicon oxide micropowder, 4-10% of aluminum oxide micropowder and 1-3% of aluminate cement; the additive occupies 100% in the main material; the additivecomprises the following ingredients by mass percent: 1-3% of compound antiknock substance, 1-3% of silica sol, 1-5% of slag-resistant wetting agent, 0.1-0.2% of water reducing agent and 1-5% of plastic material. According to the invention, crystalline flake graphite is adopted as the slag-resistant wetting agent to improve anti-erosion property of the refractory castable; the plastic material andthe suitable water reducing agent are adopted to prevent segregation of the crystalline flake graphite; and silica sol is adopted to improve the strength of the refractory castable. The fast-baking explosion proof type refractory castable for the blast furnace iron runner provided by the invention adopts site construction and can realize iron influx after being braked by big fire for 3-5 hours; and the fast-baking explosion proof type refractory castable has high density and strength, can bear iron slag scouring and is good in preventing the slag from penetration, good in anti-erosion property and long in service life.

Description

technical field [0001] The invention belongs to the field of refractory materials. In particular, it relates to a quick-drying explosion-proof refractory castable for a blast furnace iron trench. Background technique [0002] At present, quick-drying explosion-proof refractory castables have been applied in the iron trenches of small and medium-sized blast furnaces in my country. In principle, quick-drying explosion-proof refractory castables form through pores and staggered cracks in the matrix by introducing anti-explosion fibers, metal aluminum powder, aluminum lactate, azodicarbonamide and other composite anti-explosion agents to achieve the effect of anti-explosion cracking. For example, the Chinese invention patent with the publication number CN102093061A discloses a non-explosion-proof traditional iron trench castable, with white corundum and silicon carbide as aggregates, corundum powder, silicon carbide fine powder, ultrafine powder, and aluminate cement as aggrega...

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Problems solved by technology

[0003] Combining the above two patent documents and comparing the Chinese invention patent with publication number CN1661117A, it discloses a non-explosion-proof traditional iron trench castable, which uses fused dense corundum and SiC as aggregates, and uses corundum powder, ultrafine powder, High-alumina cement is used as the matrix, and silicon nitride, metal silicon, dispersant, etc. are added. Its flexural strength is 5.4-5.7MPa at 110℃×24h, and 5.5-5.8MPa at 1450℃×3h. The compressive strength of ×24h is 44-45MPa, and the compressive strength of 1450℃×3h is 92.4-96.8MPa; comprehensive analysis can be concluded that although the current application of quick-drying explosion-proof refractory castables has explosion-proof performance (explosion-proof temperature can reach 800℃) It has been reflected, and its density, strength and other performance indicators are significantly lower than those of traditional iron trench castables, and the amount of iron passing at one time is not high

Moreover, the damage of quick-drying explosion-proof refractory castables during use is mainly due to the poor erosion resistance caused by poor density and low strength, and the aggravated penetration and erosion of the castable matrix by slag.

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