Light casting material for steel ladle gas-permeable plug, and preparation method thereof

Abstract

The invention provides a light casting material for a steel ladle gas-permeable plug, and a preparation method thereof, wherein the raw materials comprise, by weight, 20-24% of tabular corundum with aparticle size of 3-5 mm, 26-30% of tabular corundum with a particle size of 1-3 mm, 17-19% of tabular corundum with a particle size of 0-1 mm, 13-15% of tabular corundum with a particle size of 60-75[mu]m, 6-9% of tabular corundum with a particle size of 30-45 [mu]m and 6-9% of alpha-Al2O3 with a particle size of 1-2 [mu]m. The preparation method comprises three steps of raw material mixed powder preparation, injection molding curing and roasting treatment, wherein the sintering temperature of the roasting treatment is 1350-1450 DEG C. According to the invention, the prepared light casting material has good slag resistance; and with the preparation method, the mass of the light casting material can be reduced while the compactness of the structure is increased, the stability and the service life of the gas-permeable plug are improved, and the maintenance is convenient.

Description

technical field [0001] The invention relates to a lightweight castable for a ladle vent plug and a preparation method thereof, belonging to the technical field of refractory materials for steelmaking. Background technique [0002] The iron and steel industry is the cornerstone of the national economy, and the proportion of high-quality steel in steel production is an important indicator reflecting the development level of the entire iron and steel industry. For a long time, the iron and steel industry has not only provided the guarantee of important raw materials for national infrastructure construction, but also strongly supported the development of related industries. The refining technology outside the furnace is the most important means to obtain high-purity, high-uniformity and high-precision steel, and in the refining process outside the LF furnace, the vent plug is an indispensable component, which is mainly used to blow argon into it gas to improve the quality of mo...

AI Technical Summary

Problems solved by technology

At present, in order to improve the slag resistance of corundum castables for ladles, zirconia and chromium oxide powders are often added to improve their thermal shock stability and service life, such as the application number 201910603352. "Introduced in the patent document, zirconia and chromium oxide powder are added to improve the performance of corundum castables. However, due to the long-term exposure of the vent plug to the high-temperature erosion of molten steel and steel slag, the chromium oxide in the transected vent plug castable will be peeled off. Such harmful substances will dissolve in high-temperature molten steel and spread in the air, which is very harmful to the environment and human body

There are also some existing venting plugs that can effectively prolong the service life of venting bricks by using their novel structures. However, due to the high density of the materials used, the time and cost of manual replacement and maintenance are very large, and the maintenance is very inconvenient.

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