Preformed piece for plate blank tundish and preparation method thereof

Abstract

The invention relates to preformed pieces for a plate blank tundish and a preparation method thereof, belonging to the technical field of the ferrous metallurgy plate blank continuous casting tundish. Two preformed pieces with the same structures and different sizes are respectively designed according to the sizes of a cover installing stopper rod of the tundish and an opening of a roaster burner and the two preformed pieces are respectively a stopper rod installing hole preformed piece 1 and a roaster burner installing hole preformed piece 3, the preformed pieces are integrally cast and molded by alumina-magnesia casting, the longitudinal section structures of the preformed pieces are in T shapes, and the transverse section shapes of the preformed pieces are circular or elliptic. A stopper rod 6 arranged on the cover 5 of the original tundish and a surrounding plate arranged on the installing hole of the roaster burner 2 are firstly removed in a gas cutting mode, the cover 5 of the original tundish and the roaster burner 2 are perforated, and the perforating external diameters are enlarged to be 20 mm larger than the lower external diameters of the preformed pieces 1 and 3; after the preformed pieces 1 and 3 are arranged, liner casting materials are cast. The preformed pieces solve the problem of the shedding of the liner resisting materials and adhering slag of the cover of the tundish, prolong the service life of the liner of the cover of the tundish and are suitable for various continuous casting tundishs controlled by the stopper rod.

Description

technical field

[0001] The invention relates to a preform for a slab tundish and a preparation method thereof, belonging to the technical field of iron and steel metallurgy slab continuous casting tundish. Background technique

[0002] The upper nozzle of the slab continuous casting tundish controlled by the stopper rod, the traditional process design is that the steel connection of the upper nozzle is flush with the nozzle block. In recent years, in order to solve the continuous casting machine's downflow and out-of-control accidents caused by the refractory materials and the adhered slag falling off and entering the upper nozzle of the tundish lining and the inner lining of the lid, the technological measures adopted are: The steel connection of the nozzle is designed to be 20-30mm higher than the nozzle block. The main defects in the production practice are: (1) The steel mouth of the upper nozzle is higher than the outlet block, so that the steel mouth of the upper nozz...

Examples

Embodiment 1

[0056] A prefabricated part for a slab tundish consisting, in percentage by weight, of the following materials:

[0057] 30% of the first-grade high-bauxite with a particle size of 10-5mm, 12% of the first-grade high-bauxite with a particle size of 2 1.0% of superfine powder, 3.5% of calcium aluminate cement, both are percentages by weight.

[0058] The high-alumina bauxite is first-grade high-alumina bauxite, and the sintered magnesia is sintered magnesia with a MgO content percentage of 95%. The SiO 2 Ultrafine powder is: SiO 2 The content is ≥92%, and the particle size is less than 2 μm, which accounts for 80-85%, and all of them are less than 5 μm.

[0059] After weighing the above-mentioned materials according to the stated ratio, add them into the mixer for dry mixing for 2-3 minutes, add 6-8% water of the total weight of the materials, and wet-mix for 4-6 minutes, put the mixed castable Put the material into the tire mold, distribute the material evenly, vibrate and ...

Embodiment 2

[0066] A prefabricated part for a slab tundish consisting, in percentage by weight, of the following materials:

[0067] 35% of the first-grade high-bauxite with a particle size of 10-5mm, 10% of the first-grade high-bauxite with a particle size of 2 1.2% of superfine powder, 3.5% of calcium aluminate cement, both are percentages by weight.

[0068] The high-alumina bauxite is first-grade high-alumina bauxite, and the sintered magnesia is sintered magnesia with a MgO content percentage of 95%. The SiO 2 Ultrafine powder is: SiO 2 The content is ≥92%, and the particle size is less than 2 μm, which accounts for 80-85%, and all of them are less than 5 μm.

[0069] After weighing the above-mentioned materials according to the stated ratio, add them into the mixer for dry mixing for 2-3 minutes, add 6-8% water of the total weight of the materials, and wet-mix for 4-6 minutes, put the mixed castable Put the material into the tire mold, distribute the material evenly, vibrate and ...

technical field

[0001] The invention relates to a preform for a slab tundish and a preparation method thereof, belonging to the technical field of iron and steel metallurgy slab continuous casting tundish. Background technique

[0002] The upper nozzle of the slab continuous casting tundish controlled by the stopper rod, the traditional process design is that the steel connection of the upper nozzle is flush with the nozzle block. In recent years, in order to solve the continuous casting machine's downflow and out-of-control accidents caused by the refractory materials and the adhered slag falling off and entering the upper nozzle of the tundish lining and the inner lining of the lid, the technological measures adopted are: The steel connection of the nozzle is designed to be 20-30mm higher than the nozzle block. The main defects in the production practice are: (1) The steel mouth of the upper nozzle is higher than the outlet block, so that the steel mouth of the upper nozz...

Examples

Embodiment 1

[0056] A prefabricated part for a slab tundish consisting, in percentage by weight, of the following materials:

[0057] 30% of the first-grade high-bauxite with a particle size of 10-5mm, 12% of the first-grade high-bauxite with a particle size of 2 1.0% of superfine powder, 3.5% of calcium aluminate cement, both are percentages by weight.

[0058] The high-alumina bauxite is first-grade high-alumina bauxite, and the sintered magnesia is sintered magnesia with a MgO content percentage of 95%. The SiO 2 Ultrafine powder is: SiO 2 The content is ≥92%, and the particle size is less than 2 μm, which accounts for 80-85%, and all of them are less than 5 μm.

[0059] After weighing the above-mentioned materials according to the stated ratio, add them into the mixer for dry mixing for 2-3 minutes, add 6-8% water of the total weight of the materials, and wet-mix for 4-6 minutes, put the mixed castable Put the material into the tire mold, distribute the material evenly, vibrate and ...

Embodiment 2

[0066] A prefabricated part for a slab tundish consisting, in percentage by weight, of the following materials:

[0067] 35% of the first-grade high-bauxite with a particle size of 10-5mm, 10% of the first-grade high-bauxite with a particle size of 2 1.2% of superfine powder, 3.5% of calcium aluminate cement, both are percentages by weight.

[0068] The high-alumina bauxite is first-grade high-alumina bauxite, and the sintered magnesia is sintered magnesia with a MgO content percentage of 95%. The SiO 2 Ultrafine powder is: SiO 2 The content is ≥92%, and the particle size is less than 2 μm, which accounts for 80-85%, and all of them are less than 5 μm.

[0069] After weighing the above-mentioned materials according to the stated ratio, add them into the mixer for dry mixing for 2-3 minutes, add 6-8% water of the total weight of the materials, and wet-mix for 4-6 minutes, put the mixed castable Put the material into the tire mold, distribute the material evenly, vibrate and ...

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