Major iron runner casting material for blast furnace

Abstract

The present invention relates to a major iron runner casting material for a blast furnace, belongs to the field of refractory casting materials, and comprises the following components in parts by weight: 5-8 parts of 8-5mm chromium nitride, 15-20 parts of 5-3mm zirconium corundum, 10-15 parts of 3-1mm sillimanite, 8-15 parts of 1-0mm calcium chromate, 2-5 parts clay powder, 3-7 parts of cobalt aluminum oxide 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 aluminium oxide micro powder, 1-5 parts of magnesium iron oxide powder, 1-3 parts of rho-aluminium oxide and 0-5 parts of electric smelting pure calcium aluminate cement. Based on the total weight by parts of the main materials: 100%, the additives comprise the following components in parts by weight: 0.1-0.2 part of lignin calcium sulfonate, 0.01-0.05 part of nano potato powder, 0.01 part of malic acid and 20:1 parts of C12H14N4O5S. The iron runner for the blast furnace made of the casting material 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 for a main iron trough of a blast furnace, belonging 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 pass is about 120,000 tons. With the strengthening of smelting, the demand for increasing the output of molten iron has become increasingly prominent, and the demand for a large amount of one-time iron flow in the main iron ditch is becoming more and more urgent. However, due to the poor corrosion resistance and thermal shock resistance of the main iron ditch, hot spalling has occurred. And structural spalling is an important reason for the short life of the main iron groove. [0003] CN102101782A discloses a main iron trough castable, which is composed of magnesium aluminum spinel, brown corundum, silicon carbide, ...

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 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 the blast furnace. As a binder, sol has high viscosity and is inconvenient for construction, so it still needs to be improved