Miniature type blast furnace branch iron runner castable

Abstract

The invention relates to a miniature type blast furnace branch iron runner castable, and belongs to the field of refractory castables. The miniature type blast furnace branch iron runner castable comprises the following components in parts by weight: 5-8 parts of 8-5mm plate-like corundum, 15-20 parts of 5-3mm chromium nitride, 10-15 parts of 3-1mm sillimanite, 8-15 parts of 1-0mm chromite calcium, 2-5 parts of partial 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 aluminum oxide micro powder, 1-5 parts of magnesium oxide iron powder, 1-3 parts of rho aluminum oxide, and 0-5 parts of electric smelting pure calcium aluminate cement; the percentage by weight of an additive is 100% according to the total percentage in percentages by weight of main materials, and the additive comprises the following components in parts by weight: 0.1-0.2 part of calcium ligninsulfonate, 0.01-0.05 part of nanometer dried potato powder, 0.01 part of malic acid and 0.1 part of C12H14N4O5S2. A blast furnace branch iron runner manufactured by the castable has the characteristics of high thermal shock resistance, high erosion resistance, large iron flux and long service life.

Description

technical field [0001] The invention relates to a pouring material for a small-sized blast furnace support channel, belonging 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, ...

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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