Refractory castable

Abstract

The invention relates to refractory castable. The castable comprises a main material and additives. The main material is prepared from, by weight, 5-8 parts of barium aluminate with granularity of 5-8 mm, 15-20 parts of chromium nitride with granularity of 3-5 mm, 10-15 parts of andalusite with granularity of 1-3 mm, 8-15 parts of calcium chromate with granularity of 0-1 mm, 2-5 parts of partial clay powder, 3-7 parts of cobaltous oxide aluminum powder, 5-10 parts of cutting powder, 3-8 parts of earthy graphite powder, 1-2 parts of composite carbon powder, 0-3 parts of molybdenum trioxide powder, 3-5 parts of alumina micro powder, 1-5 parts of magnesium oxide iron powder, 1-3 parts of rho-alumina and 0-5 parts of electric smelting pure calcium aluminate cement. With the total weight parts of the main material being 100 parts, the additives are prepared from, by weight, 0.1-0.2 part of calcium lignosulphonate, 0.01-0.05 part of nanometer potato powder, 0.01 part of malic acid and 0.1 part of C12H14N4O5S2. A blast furnace iron groove prepared from the castable has the advantages of being high in thermal seismic resistance, high in corrosion resistance, large in iron exchange amount and long in service life.

Description

Technical field [0001] The invention relates to a refractory castable, belonging to the field of iron trough castables for metallurgy. Background technique [0002] Most of the existing branch iron ditch castables are Al2O3-SiC-C castables, but ordinary Al2O3-SiC-C branch iron ditch castables are used in blast furnaces, and the amount of one-time iron pass is about 120,000 tons. With the intensified smelting, the demand for increasing the output of molten iron has become more and more prominent, and the demand for a large amount of one-time iron flow in branch iron ditch is becoming more and more urgent. However, due to poor corrosion resistance and poor thermal shock resistance, the branch iron ditch has hot spalling. And structural spalling is an important reason for the short life of the branch iron trench. [0003] CN102101782A discloses an iron ditch castable, which is composed of magnesium aluminum spinel, brown corundum, silicon carbide, modified nano carbon powder, SiO2 po...

AI Technical Summary

Problems solved by technology

However, this kind of castable with brown corundum as the main component has poor thermal shock resistance, and it is easy to cause thermal spalling and structural spalling, which greatly increases the frequency of repairing the support iron ditch and brings great hidden dangers to the stable and safe production of the blast furnace. In addition, As a binder, sol has high viscosity and is not easy to construct, so it still needs to be improved

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