Magnesia-alumina spinel stemming

Abstract

The invention provides a magnesia-alumina spinel stemming with micro expansibility, good slag corrosion resistance and abrasion resistance for a blast furnace casting port, which belongs to the field of metallurgical fireproof material. The stemming comprises the following raw materials in part by mass: 5 to 30 parts of magnesia particles, 5 to 15 parts of light-burnt magnesia powder, 20 to 45 parts of corundum, 10 to 20 parts of silicon carbide, 10 to 18 parts of coke, 3 to 10 parts of asphalt, 6 to 12 parts of clay, 12 to 24 parts of tar, and 2 to 8 parts of nitride. The magnesia-alumina spinel stemming has the advantages that: a magnesium material adopts the compound addition of the magnesia particles and the light-burnt magnesia powder, and the spinel generated by reaction and the preserved magnesium material are fireproof materials with excellent performance; the proportional relation of the magnesia, the light-burnt magnesia powder and the corundum is optimized based on the addition of the light-burnt magnesia powder so that the linear variation of the stemming after high-temperature calcination has micro-expansion, and the service performance of the stemming is improved; and simultaneously, the reduction of the consumption of tar is helpful for improving the environment and reducing the production cost of the stemming.

Description

technical field [0001] The invention relates to a gun mud specially used for blocking a blast furnace tap hole, belonging to the field of metallurgical refractory materials. Background technique [0002] The widely used blast furnace tap hole anhydrous taphole mud belongs to Al 2 o 3 -SiO 2 - SiC-C based materials. According to different binders, there are two types of tar gun mud and resin gun mud. Due to the high cost of resin gun putty, although it has certain advantages in environmental protection, the scope of popularization and application is limited. As far as the traditional tar gun clay is concerned, the main ingredients include bauxite, brown corundum, coke, clay, quartz, silicon carbide, sericite, nitride, etc., and tar is selected as the binder. [0003] Al 2 o 3 -SiO 2 -SiC-C tar-type clay, large linear shrinkage will occur in high temperature environment, which will easily lead to gaps between new and old clay; under the action of thermal stress, micro-...

AI Technical Summary

Problems solved by technology

[0003] al 2 o 3 -SiO 2 -SiC-C tar-type clay, large linear shrinkage will occur in high temperature environment, which will easily lead to gaps between new and old clay; under the action of thermal stress, micro-cracks will appear, so that the clay It is easy to be infiltrated, eroded, and damaged by molten slag and iron.

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