Large blast furnace main iron runner castable

Abstract

The invention relates to a large blast furnace main iron runner castable, and belongs to the field of refractory castables. The large blast furnace main iron runner castable is prepared from, by weight, 5-8 parts of 8-5 mm chromium nitride, 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 chromate, 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 amorphous graphite powder, 1-2 parts of composite charcoal 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-aluminum oxide, 0-5 parts of electric smelting pure calcium aluminate cement and an addition agent, wherein the addition agent is 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 runner made of the castable has the advantages of being good in thermal shock resistance, high in corrosion resistance, large in iron exchanging amount and long in life.

Description

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

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Problems solved by technology

However, this kind of castable with brown corundum as the main component has poor thermal shock resistance, which is easy to cause thermal spalling and structural spalling, which greatly increases the frequency of repairing the main iron trench and brings great hidden dangers to the stable and safe production of blast furnaces. As a binder, it is difficult to construct because of its high viscosity. In addition, the cost has also increased a lot, so it still needs to be improved.

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