Preparation method of Al2O3-SiC-C castable material for slag line of main trough of blast furnace

Abstract

The invention relates to an Al2O3-SiC-C castable material for a slag line of a main trough of a large blast furnace and a preparation method thereof. The castable material comprises an aggregate, a matrix, a bonding agent, an antioxidant and an admixture; wherein, the aggregate comprises corundum grains and carborundum grains; the matrix comprises ball pitch, flake graphite, corundum fine powder, a-Al2O3 ultrafine powder, silicon powder and carborundum ultrafine powder; the bonding agent is aluminate cement; the antioxidant is a compound of aluminium powder and silicon powder; the admixture comprises a water reducing agent and a detonation suppressor. The castable material is prepared by the steps of mixing various raw materials evenly, adding water, stirring, casting molding, maintaining and drying. The castable material has strong anti-slag corrosion and anti-scour capabilities, good high temperature resistance, abrasion resistance and thermal shock resistance, slight reheating change and long service life.

Description

technical field [0001] The invention relates to a pouring material used above the slag line of the main tapping ditch of a large-scale ironmaking blast furnace, and belongs to the field of refractory materials. Background technique [0002] In recent years, with the development of blast furnaces in the direction of large-scale, automation, high efficiency, and long life, and the use of new technologies such as high wind temperature, high-pressure furnace roof, oxygen-enriched, and coal injection to strengthen smelting, the working conditions of the iron trench have become increasingly harsh. At the same time, the increase in the amount of ironing and the increase in the time for the ironing put forward new requirements for the tapping channel. [0003] At present, generally large and medium-sized blast furnaces adopt the iron storage type main iron trench, which is conducive to the separation of slag and iron, and also helps to improve the service life of the castable at the...

AI Technical Summary

Problems solved by technology

In the industry, large and medium-sized iron trenches generally use on-site cast corundum-silicon carbide-carbon refractory materials to construct the working layer. Usually, the same material is used for different parts such as iron wires and slag wires, but the erosion and damage mechanisms of each part are different. The main factors of damage to the refractories below the iron line of the main iron ditch are molten iron erosion and erosion, while the main factors of damage to the refractory materials in the slag line area above the iron line are slag liquid erosion, oxidation, erosion, etc., because the slag liquid contains a large amount of S, Si, P, Ca, Mg and other elements have great chemical erosion damage to the castable, so that the service life of the refractory material in the slag line area is significantly lower than the service life of materials in other parts, causing the service life of each part of the main ditch to be out of sync. , affecting the overall service life of the main ditch

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