Novel refractory material for low-carbon tundish working lining and building method

Abstract

The invention provides a novel refractory material for a low-carbon tundish working lining and a building method. The refractory material comprises the following components in percentage by mass: 65-75% of magnesia particles or / and olivine particles, 20-25% of magnesia fine powder, 2-5% of silica powder, 0.5-1.5% of sodium tripolyphosphate, 0-0.5% of paper fibers, 0.3-0.7% of rice hull fragments,0.5-2.5% of a plasticizer, 0-0.3% of organic fibers and 0-1% of an additive. The carbon residue rate of the refractory material is 0.2%-0.7%. The water adding amount is effectively reduced, and moltensteel recarburization is reduced; workers do not need to enter the tundish, construction is convenient, and labor intensity and harm of high-temperature environment construction are avoided; and layered smearing or spraying is avoided, and layered stripping of the working lining in the using process is prevented.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a novel low-carbon tundish working lining refractory material and a masonry method. Background technique [0002] The tundish is a refractory container between the continuous casting ladle and the crystallizer. In the initial stage of continuous casting, the tundish was only used as a storage and distributor for molten steel from the ladle to the crystallizer. Pollution, prevention of secondary oxidation of molten steel, prevention of refractory corrosion and ladle eddy slag entanglement play an important role in stabilizing continuous casting production and improving the quality of continuous casting slabs. [0003] The smearing material / spray coating tundish has the advantages of not polluting the molten steel, and has a purifying effect on the molten steel; it has low carbon content and less carbon increase in the molten steel; it has excellent resistance to slag erosio...

AI Technical Summary

Problems solved by technology

[0004] (1) In order to ensure the adhesion of the construction performance, a large amount of paper fiber and organic fiber must be added to the smear material. Although the total carbon content is lower than that of the dry material tundish, there will still be about 0.8% to 1.5%. Residual carbon, unable to further reduce the carburization of molten steel;

[0005] (2) The construction of the existing smear / spray paint tundish requires a thermal permanent layer (generally above 100°C), and manual smearing or spraying needs to enter the tundish, which is labor-intensive and workers cannot work in a high-temperature environment for a long time. Especially in summer, it is very easy to suffer from heat stroke;

[0006] (3) At present, the smear / spray paint tundish is applied or sprayed in layers, which is easy to cause layered peeling due to the erosion and penetration of slag during use;

Therefore, all materials should be prepared according to the standard of slag wire materials, resulting in high overall cost of smearing materials;

[0008] (5) After the construction is completed, it is directly used for continuous casting for standby, and the phenomenon of baking explosion often occurs during online baking, which affects the production rhythm of the steel factory