Heat-insulating coating material for inner bore of long nozzle for continuous steel casting, preparation method for heat-insulating coating material and construction method of heat-insulating coating material and construction

Abstract

The invention discloses a heat-insulating coating material for an inner bore of a long nozzle for continuous steel casting. The formula is characterized by comprising the ingredients in parts by weight: 0.5-0.8 part of fused quartz with the particle size of 0.5-0.2mm, 0.1-0.25 part of fused quartz with the particle size of 0.2-0.1mm, 0.2-0.4 part of white alundum with the particle size of 180 meshes, 0.2-0.5 part of white alundum with the particle size of 325 meshes, 0.5-0.8 part of floating beads with the particle size of 120 meshes and 1-6 parts of bentonite with the particle size of 400 meshes. The formula further comprises water glass and water, wherein the parts of the water glass are 1 to 3 times that of total parts of the solid powder material, and the parts of the water are 0.05 to0.1 times that of total parts of the solid powder material. The invention simultaneously provides a preparation method for the coating material and a construction method of the coating material. Thesurface of the inner bore of the long nozzle for continuous steel casting can be coated with the coating material according to user needs so as to improve the fire resistance and thermal shock resistance of the long nozzle; and higher flexibility and adaptability are provided for the available performance-sized long nozzles in use, so that the waste is reduced, and the production cost of enterprises is reduced.

Description

technical field [0001] The invention relates to a thermal insulation coating for long nozzle inner holes for continuous steel casting, a preparation method and a construction method thereof. Background technique [0002] In the prior art, the shroud for continuous steel casting is mainly installed under the ladle (that is, between the ladle and the tundish), which is an Al2O3–C circular tubular channel through which the molten steel is injected into the tundish from the ladle, and plays a role in diversion and protection of the molten steel. Affected by secondary oxidation to prevent splashing of molten steel, it is an important functional refractory material to realize protective casting of molten steel to improve the quality of steel slabs. Its use will directly affect whether the entire continuous casting process can be carried out normally. [0003] The raw materials used in the known shroud body can be divided into aggregate (0.5-0.2mm), fine powder (<0.088mm) and fl...

AI Technical Summary

Problems solved by technology

However, no matter which way is mentioned above, the refractory heat preservation and thermal shock resistance performance of the long nozzle for continuous steel casting is limited during the raw material firing process, that is, the refractory heat preservation and thermal shock resistance performance of the fired product is limited. They are all fixed and cannot be changed, unless the raw materials are adjusted and returned to the furnace for re-firing

This also leads to the fact that the current long nozzle for continuous steel casting cannot be properly adjusted by the user according to the actual pouring conditions and refractory temperature requirements, resulting in a lack of flexibility and waste.

It often happens that the original long nozzle for continuous steel casting is not suitable for pouring molten steel that requires higher refractory temperature, so it is discarded. For this reason, the enterprise needs to repurchase or burn new products, or some enterprises will replace the original one. A batch of products with good refractory properties are used in low-demand molten steel pouring occasions, which not only increases the production cost, but also easily delays the construction period, and causes a certain degree of waste of enterprise resources

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