Castable for branch iron trough of 1,250 m<3> blast furnace

Abstract

The invention relates to a castable for a branch iron trough of a 1,250 m<3> blast furnace. The castable comprises a main material and an admixture, wherein the main material comprises components in parts by weight as follows: 5-8 parts of 8-5-mm aluminum silicate, 15-20 parts of 5-3-mm chromium nitride, 10-15 parts of 3-1-mm sillimanite, 8-15 parts of 1-0-mm calcium chromite, 2-5 parts of meta-clay powder, 3-7 parts of cobalt oxide aluminum powder, 5-10 parts of cutting powder, 3-8 parts of amorphous 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 fused pure calcium aluminate cement; in terms of the total parts by weight of the main material being 100%, the admixture comprises 0.1-0.2 parts by weight of calcium lignosulphonate, 0.01-0.05 parts by weight of nano dried potato powder, 0.01 parts by weight of malic acid and 0.1 parts by weight of C12H14N4O5S2. The blast furnace iron trough prepared from the castable has the characteristics of good thermal shock resistance, good erosion resistance, high iron flux and long service life.

Description

technical field [0001] The invention relates to a castable for a 1250m3 blast furnace support channel, which belongs to the field of refractory materials for metallurgy. Background technique [0002] Most of the existing iron channel castables are Al2O3-SiC-C castables, but ordinary Al2O3-SiC-C iron channel castables are used in blast furnaces, and the amount of iron passing through them at one time is about 120,000 tons. With the strengthening of smelting, the demand for increasing the output of molten iron is becoming more and more prominent, and the need for a large amount of iron to be passed through the iron channel at one time is also becoming more and more urgent. However, due to the poor corrosion resistance and thermal shock resistance of the iron channel at present, thermal spalling has occurred. And structural spalling is an important reason for the short life of the support iron ditch. [0003] CN102101782A discloses a casting material for iron trench, which is ...

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, is not easy to construct, and has high cost, so it still needs to be improved

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