High-performance high-aluminum castable for iron runner

Abstract

The invention discloses a high-performance and high-aluminum castable for an iron runner. The castable comprises the following components in percentage by mass: 70-72% of high-aluminum aggregate; 2-3% of ball pitch; 0.8%-1.2% of pure calcium aluminate cement; 8-10% of alumina micro powder; 2 to 3 percent of submicron SiO2 micro powder; 12-13% of silicon carbide powder; 0.8-1% of metal silicon powder; 0.1%-0.16% of metal aluminum powder; 0.16 to 0.2 percent of nano carbon black; 0.08 to 0.16 percent of explosion-proof fiber; and 0.1%-0.15% of a dispersing agent; and the product is prepared by adding 4.2% of water, uniformly stirring the components, and carrying out vibration molding. Through multiple technical measures, the compactness degree of the high-aluminum iron runner castable is improved to the maximum extent, meanwhile, a castable matrix generates fewer low-melting phases at high temperature, and through breakthrough enhancement of the performance of the powder matrix, the defect of the high-temperature performance of high-aluminum aggregate is counteracted, the problem that the thermal strength of the high-aluminum iron runner castable is obviously reduced compared with that of a corundum iron runner castable for a long time is solved, and the aim of completely replacing corundum aggregate with high-aluminum aggregate in a common iron runner castable is achieved.

Description

technical field [0001] The invention belongs to the field of unshaped refractory materials, and in particular relates to a high-performance high-alumina iron trench castable. Background technique [0002] The iron trough of the blast furnace casthouse is an important part of the ironmaking process. Since the iron trough lining has to withstand the long-term erosion of molten iron and iron slag at about 1500 ° C, there are special and strict requirements for the use of the castable. At present, corundum-based silicon carbide carbonaceous iron channel castables are generally used to ensure its use requirements. However, the fierce market competition has prompted the iron trench contracting enterprises to significantly reduce the raw material cost of iron trench castables on the premise of ensuring safe use, and replace the expensive corundum in castables with lower-priced high-alumina aggregates Aggregate and silicon carbide aggregate are important options for various supplie...

AI Technical Summary

Problems solved by technology

[0003] However, due to the low chemical purity of high-alumina aggregate compared to brown corundum, and the relatively poor compactness of the aggregate itself, when a high proportion of high-alumina aggregate replaces brown corundum in iron trench castables, it will lead to castables The amount of water added increases, the amount of cement increases, the overall purity of the castable decreases, and the slag resistance performance decreases significantly, resulting in a significantly reduced service life, "the loss outweighs the gain"

Images