Ladle bottom castable and preparation method thereof

Abstract

The invention relates to a ladle bottom castable and a preparation method thereof. The technical scheme is as follows: 60-70wt% of titanium-iron slag particles are taken as aggregate, and 25-35wt% of titanium-iron slag fine powder, 1-4wt% of zirconia micro powder and 2-5wt% of titanium oxide micro powder are taken as substrate materials; according to the content of the aggregate and the substrate materials, the substrate materials are uniformly mixed firstly, and then the uniformly mixed substrate materials are added to the aggregate to be uniformly mixed; silica sol accounting for 3-7wt% of the sum of the substrate materials and the aggregate is added, and the mixture is uniformly stirred, subjected to vibratory compaction, cured for 6-12 h under the condition of room temperature and finally subjected to heat preservation for 12-24 h under the condition of 90-110 DEG C to prepare the ladle bottom castable. The ladle bottom castable and the preparation method have the characteristics of low cost and simple process, and the prepared ladle bottom castable has good high-temperature volume stability and good corrosion resistance to slag.

Description

technical field [0001] The invention belongs to the technical field of ladle castables. Specifically relates to a ladle bottom pouring material and a preparation method thereof. Background technique [0002] Ladles are important storage and transportation equipment and smelting equipment in the iron and steel industry. The ladle bottom refractory material bears the scour of the steel stream and the flow of molten steel during the steelmaking process, resulting in spalling of the structure and slag erosion, making the service life of the ladle bottom refractory material much lower than that of the ladle wall and slag line, etc. The safety production of high temperature industry has caused certain hidden dangers. [0003] At present, refractory materials for ladle bottoms are mainly aluminum-magnesium castables such as "corundum-spinel castables" and "high-purity alumina-spinel castables / prefabricated parts". [0004] "Corundum-spinel castable" is used as the refractory mat...

AI Technical Summary

Problems solved by technology

[0004] "Corundum-spinel castable" is used as the refractory material for the bottom of the ladle, which has high refractoriness and excellent high-temperature mechanical properties, especially the obvious difference in thermal expansion coefficient between corundum and spinel, which can better ease the refractory during the flow of molten steel The thermal stress inside the material; "corundum-spinel castable" is used as the refractory material for the bottom of the ladle. Although the micro-cracks caused by the difference in thermal expansion coefficient can be used to relieve the thermal stress inside the material, the existence of micro-cracks is also Significantly reduces the slag erosion / penetration resistance of the refractory