Carbon fiber toughened refractory castable for molten iron desulfurization spray gun and preparation method thereof

Abstract

The invention relates to a carbon fiber toughened refractory castable for a molten iron desulfurization spray gun and a preparation method thereof. The technical solution is: first mix 2~4 parts by mass of high-purity fused mullite powder, 5~10 parts by mass of fused dense corundum fine powder, 2~5 parts by mass of α‑Al 2 o 3 Micropowder, 5~8 parts by mass of ρ‑Al 2 o 3 Micropowder, 3~7 parts of silicon micropowder, 1~4 parts of silicon carbide powder, 1.5~3 parts of pure calcium aluminate cement and additives are scattered into the flat bottom container and mixed; then 35~48 parts High-quality natural fused mullite, 20-30 parts of andalusite and 3-6 parts of high-purity fused mullite particles are scattered into a flat-bottomed container and mixed; then poured into a mixer and stirred evenly, That is, the carbon fiber toughened refractory castable for molten iron desulfurization spray gun is obtained. The invention has low cost and wide source of raw materials, and the manufactured product has good thermal shock stability, can prolong the service life of the molten iron desulfurization spray gun, increase the use temperature and reduce the use cost.

Description

technical field [0001] The invention relates to the technical field of refractory castables for molten iron injection pretreatment spray guns. Specifically relates to a carbon fiber toughened refractory castable for a molten iron desulfurization spray gun and a preparation method thereof. Background technique [0002] The molten iron pretreatment spray gun is a tool for conveying and spraying pretreatment agent deep into the container loaded with high temperature molten iron. It is a composite structure mainly composed of a metal gun core and a refractory material gun lining. Among them, the main function of the metal gun core is to ensure the strength and stiffness of the spray gun, the smooth flow of the injection channel and the stability of the injection flow field; the main function of the refractory gun lining is to resist fire, heat insulation, corrosion resistance and molten iron erosion, etc. Prevent high-temperature deformation, melting loss, oxidation and ablatio...

AI Technical Summary

Problems solved by technology

At the same time, the high-temperature melting of steel fibers weakens the drawing-strengthening and toughening effect of steel fibers, thereby aggravating the crack peeling and erosion wear of the gun lining of the spray gun refractory material, especially when the temperature of molten iron is greater than 1350 ° C, the steel fibers are oxidized, melted Corrosion is severe, and the strengthening and toughening effect is significantly reduced, resulting in a sharp decline in the service life of the spray gun

[0005] It can be seen that the gun lining refractory castable technology commonly used in spray guns at present reduces the adaptability of the spray gun to the high temperature of molten iron due to the addition of steel fibers, reduces the service life of the spray gun, restricts the actual application effect of the spray gun, and increases the cost of desulfurization

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