Castable for main iron trough

Abstract

The invention relates to a castable for a main iron trough. The castable comprises a main material and an additive, wherein the main material comprises components in parts by weight as follows: 5-8 parts of 10-5mm magnesium titanate, 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 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 carbon powder, 0-3 parts of molybdenum trioxide powder, 3-5 parts of alumina micropowder, 1-5 parts of magnesium oxide iron powder, 1-3 parts of rho aluminum oxide and 1-5 parts of fused calcium aluminate cement; the additive comprises, in parts by weight, 0.1-0.2 parts of calcium lignosulfonate, 0.01-0.05 parts of nano potato powder, 0.01 parts of malic acid and 0.1 parts of C12H14N4O5S2 on the basis that the parts of the main material by weight adds up to 100%. The blast furnace iron trough prepared with the castable has the characteristics of good thermal shock resistance, high corrosion resistance, large iron influx and long service life.

Description

technical field [0001] The invention relates to a castable material for a main iron ditch, which belongs to the field of refractory materials for metallurgy. Background technique [0002] Most of the existing main iron trench castables are Al 2 o 3 -SiC-C castables, but ordinary Al 2 o 3 -SiC-C iron trough castables are used in blast furnaces, and the amount of iron passing through at one time 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 casting material for iron trench, which is composed ...

AI Technical Summary

Problems solved by technology

However, this kind of castable with brown corundum as the main component has poor thermal shock resistance, which easily leads to thermal spalling and structural spalling, which greatly increases the frequency of iron trench repair operations and brings great hidden dangers to the stable and safe production of blast furnaces. In addition, sol The viscosity is relatively high, the price is relatively expensive, and it is not easy to construct, so it still needs to be improved

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