Environment-friendly iron runner castable with excellent slag corrosion resistance

Abstract

The invention discloses an environment-friendly iron runner castable with excellent slag corrosion resistance. The environment-friendly iron runner castable comprises the following components: 57-62% of brown aluminum oxide; 6-8% of compact corundum; 15-25% of silicon carbide; 2-3% of nodular graphite; 1-1.5% of composite calcium aluminate cement; 1.5-2% of silicon dioxide micro powder; 4-7% of alumina micro powder; 2-4% of titanium dioxide micro powder; 1.3 to 2.5% of a composite antioxidant; 0.1 to 0.2 percent of an anti-explosion agent; 0.03 to 0.05 percent of a surfactant; and 0.1-0.15% of a high efficiency water reducing agent. The castable is excellent in slag iron corrosion resistance, low in consumption of refractory materials per ton of iron, free of toxic and harmful smoke in the using process, environment-friendly and wide in application prospect.

Description

technical field [0001] The invention belongs to the technical field of unshaped refractory materials, and in particular relates to an environment-friendly castable for iron trenches with excellent slag erosion resistance. Background technique [0002] In the existing blast furnace smelting technology, the main iron ditch of the blast furnace tap field periodically receives molten iron and slag from blast furnace smelting. In the main iron ditch, the slag and molten iron are separated due to their different densities, and then the slag and molten iron are separated by skimming. The slag container flows into the slag ditch and the branch iron ditch. During this process, the main iron trench is severely eroded by molten iron and slag with a temperature of up to 1500°C, so the castable for the iron trench is required to have excellent resistance to slag iron corrosion. Castables with poor slag corrosion resistance have short service life, low iron throughput, and high consumpti...

AI Technical Summary

Problems solved by technology

The carbon content of ball pitch is low (F.C is about 55wt%), and a large amount of toxic and harmful choking yellow smoke is produced during the baking process, which seriously deteriorates the site environment

Graphite has a high carbon content, and due to the higher activity of graphite, it is easier to react to form silicon carbide whiskers in the original layer of the castable material, which improves the performance of the material, but due to its flaky structure and its non-hydrophilic characteristics, It is difficult to disperse in the castable, which increases the amount of water added to the castable, and most of the flake graphite floats to the surface of the castable during the stirring process, which makes the component distribution of the molded castable uneven, so it is difficult to apply to the castable

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