Casting material for branch iron runner of 500 m3 blast furnace

Abstract

The present invention relates to a casting material for a branch iron runner of a 500 m3 blast furnace, and belongs to the field of refractory casting materials. The casting material comprises the following components in parts by weight: 5-8 parts of 8-5 mm magnesium silicate, 15-20 parts of 5-3 mm chromium nitride, 10-15 parts of 3-1 mm mullite, 8-15 parts of 1-0 mm chromic acid calcium, 2-5 parts of 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 aluminium oxide and 0-5 parts of melting pure calcium aluminate cement; Based on the total weight of the above main materials of 100%, the additive comprises: 0.1-0.2 part of calcium lignosulfonate, 0.01-0.05 part of nanometer potato powder, 0.01 part of malic acid and 0.1 part of C12H14N4O5S2. The iron runner of the blast furnace prepared by the casting material has the advantages of good thermal shock resistance, corrosion resistance, large iron influx and long service life.

Description

technical field [0001] The present invention relates to a 500m 3 The utility model relates to a castable for a blast furnace support iron ditch, which belongs to the field of metallurgical refractory materials. 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 c...

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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, 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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