Main iron trough castable for small blast furnace

Abstract

The invention relates to a main iron trough castable for a small blast furnace, belonging to the field of refractory castables. The main iron trough castable comprises the following components in parts by weight: 5-8 parts of 8-5mm tabular corundum, 15-20 parts of 5-3mm chromium nitride, 10-15 parts of 3-1mm sillimanite, 8-15 parts of 1-0mm calcium chromate, 2-5 parts of slightly-viscous clay powder, 3-7 parts of aluminum cobalt oxide powder, 5-10 parts of cutting powder, 3-8 parts of amorphous graphite, 1-2 parts of composite carbon powder, 0-3 parts of molybdenum trioxide powder, 3-5 parts of alumina micropowder, 1-5 parts of iron magnesium oxide, 1-3 parts of rho aluminum oxide and 0-5 parts of electrically-melted calcium aluminate cement; based on 100% of total weight parts of main materials, an additive comprises the following components in parts by weight: 0.1-0.2 part of calcium lignosulphonate, 0.01-0.05 part of nanometer potato flour, 0.01 part of malic acid and 0.1 part of C12H14N4O5S2. The blast furnace produced by using the castable has the characteristics of good thermal shock resistance, high erosion resistance, high iron throughput and long service life.

Description

technical field [0001] The invention relates to a castable material for a main iron trough of a small blast furnace, 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 o...

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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. 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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