A scour-resistant tundish impact plate and preparation method thereof

Abstract

The present invention relates to the technical field of steelmaking, and in particular to a scouring-resistant tundish impact plate and a preparation method thereof. The tundish impact plate comprises the following components in parts by weight: 20 to 30 parts of sintered magnesia with a particle size of 1 to 3 mm; 35 to 45 parts of sintered magnesia with a particle size of 0.088 to 1 mm; 15 to 20 parts of sintered magnesia with a particle size of ≤0.088 mm; 20 to 25 parts of plate-shaped corundum with a particle size of 0.088 to 1 mm; 15 to 20 parts of plate-shaped corundum with a particle size of ≤0.088 mm; 10 to 15 parts of ultrafine graphite with a particle size of ≤0.018 mm; 8 to 10 parts of composite binder; 5 to 8 parts of metal silicon powder; 5 to 8 parts of metal aluminum powder; 3 to 5 parts of titanium dioxide; 3 to 5 parts of nylon; and the composite binder is a composite of water glass and phenolic resin. The present invention can improve the anti-molten steel impact performance of the intermediate plate by adding micropowder additives and composite binders.

Description

Technical Field

[0001] The invention relates to the technical field of steelmaking, in particular to a scouring-resistant tundish impact plate and a preparation method thereof. Background Art

[0002] The tundish impact plate is an anti-turbulence device placed in the impact zone of the ladle flow in the tundish. The tundish impact plate can limit the impact of the ladle flow, reduce the direct erosion of the ladle bottom by the flow, reduce the splash of molten steel, reduce the turbulent flow of molten steel, prevent slag rolling, improve the piston flow characteristics of the molten steel flow in the tundish, and reduce dead zones and short-circuit flows.

[0003] The existing tundish impact plate material is Al2O3-MgO-C unfired brick, which is extruded, but has low high-temperature flexural strength, poor resistance to molten steel impact, large permanent line changes after firing, and is prone to cracks during high-temperature use.

[0004] Therefore, there is an urgent need for an erosion-resistant tundish impact plate that can improve the steel liquid impact resistance and extend the service life of the tundish. Summary of the invention

[0005] In order to overcome the defects of the prior art, the technical problem solved by the present invention is to provide a scour-resistant tundish impact plate and a preparation method thereof. The present invention can improve the molten steel impact resistance of the tundish by adding micropowder additives and composite binders.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A scour-resistant tundish impact plate comprises the following components in parts by weight:

[0008]

[0009]

[0010] The composite binder is a composite of water glass and phenolic resin.

[0011] The MgO in the sintered magnesia is ≥95%.

[0012] The fiber length of the nylon is 3 to 5 mm.

[0013] The weight ratio of water glass to phenolic resin in the composite binder is 1:2.

[0014] The silicon content in the metal silicon powder is ≥98%; the particle size of the metal silicon powder is ≤325 meshes; the aluminum content in the metal aluminum powder is ≥99%; the particle size of the metal aluminum powder is ≤325 meshes.

[0015] A method for preparing a scour-resistant tundish impact plate, the specific steps are as follows:

[0016] 1) Prepare the components according to the above ratio, put sintered magnesia with a particle size of 1 to 3 mm, sintered magnesia with a particle size of 0.088 to 1 mm, and plate-shaped corundum with a particle size of 0.088 to 1 mm into a mixer and stir for 3 to 5 minutes; then add ultrafine graphite with a particle size of ≤0.018 mm, sintered magnesia with a particle size of ≤0.088 mm, and plate-shaped corundum with a particle size of ≤0.088 mm into the mixer and stir for 3 to 5 minutes; then add a composite binder, metal silicon powder, metal aluminum powder, titanium dioxide, and nylon, and continue stirring for 8 to 12 minutes to finally obtain a mixture;

[0017] 2) placing the mixture into a mold and pressing it to obtain a molded brick;

[0018] 3) Dry the formed bricks at 200-250°C for 12-24 hours, cool, and demould to obtain the tundish impact plate.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention adopts micro-powder additives of metal silicon powder, metal aluminum powder and titanium dioxide, wherein the metal silicon powder and metal aluminum powder are beneficial to improving the oxidation resistance of the impact plate, and the addition of titanium dioxide can reduce the thermal expansion coefficient of the refractory material, thereby significantly improving its thermal shock resistance stability; in addition, the present invention adopts a composite binder of water glass and phenolic resin to form a denser structure, effectively preventing the penetration of moisture and other harmful substances, thereby improving the resistance to molten steel impact and extending the service life of the material. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention are further described below:

[0022] Example 1

[0023] The present invention provides a scour-resistant tundish impact plate, comprising the following components in parts by weight:

[0024]

[0025]

[0026] The composite binder is a composite of water glass and phenolic resin.

[0027] The MgO in the sintered magnesia is ≥95%.

[0028] The fiber length of the nylon is 3 to 5 mm.

[0029] The weight ratio of water glass to phenolic resin in the composite binder is 1:2.

[0030] The silicon content in the metal silicon powder is ≥98%; the particle size of the metal silicon powder is ≤325 meshes; the aluminum content in the metal aluminum powder is ≥99%; the particle size of the metal aluminum powder is ≤325 meshes.

[0031] A method for preparing a scour-resistant tundish impact plate, the specific steps are as follows:

[0032] 1) Prepare the components according to the above ratio, put sintered magnesia with a particle size of 1 to 3 mm, sintered magnesia with a particle size of 0.088 to 1 mm, and plate-shaped corundum with a particle size of 0.088 to 1 mm into a mixer and stir for 3 minutes; then add ultrafine graphite with a particle size of ≤0.018 mm, sintered magnesia with a particle size of ≤0.088 mm, and plate-shaped corundum with a particle size of ≤0.088 mm into the mixer and stir for 3 minutes; then add a composite binder, metal silicon powder, metal aluminum powder, titanium dioxide, and nylon, and continue stirring for 9 minutes to finally obtain a mixture;

[0033] 2) placing the mixture into a mold and pressing it to obtain a molded brick;

[0034] 3) Dry the formed bricks at 220°C for 15 hours, cool them, and demould them to obtain the tundish impact plate.

[0035] Example 2

[0036] The present invention provides a scour-resistant tundish impact plate, comprising the following components in parts by weight:

[0037]

[0038]

[0039] The composite binder is a composite of water glass and phenolic resin.

[0040] The MgO in the sintered magnesia is ≥95%.

[0041] The fiber length of the nylon is 3 to 5 mm.

[0042] The weight ratio of water glass to phenolic resin in the composite binder is 1:2.

[0043] The silicon content in the metal silicon powder is ≥98%; the particle size of the metal silicon powder is ≤325 meshes; the aluminum content in the metal aluminum powder is ≥99%; the particle size of the metal aluminum powder is ≤325 meshes.

[0044] A method for preparing a scour-resistant tundish impact plate, the specific steps are as follows:

[0045] 1) Prepare the components according to the above ratio, put sintered magnesia with a particle size of 1 to 3 mm, sintered magnesia with a particle size of 0.088 to 1 mm, and plate-shaped corundum with a particle size of 0.088 to 1 mm into a mixer and stir for 3 to 5 minutes; then add ultrafine graphite with a particle size of ≤0.018 mm, sintered magnesia with a particle size of ≤0.088 mm, and plate-shaped corundum with a particle size of ≤0.088 mm into the mixer and stir for 5 minutes; then add a composite binder, metal silicon powder, metal aluminum powder, titanium dioxide, and nylon, and continue stirring for 12 minutes to finally obtain a mixture;

[0046] 2) placing the mixture into a mold and pressing it to obtain a molded brick;

[0047] 3) Dry the formed bricks at 250°C for 20 hours, cool them, and demould them to obtain the tundish impact plate.

[0048] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. In addition, the various different embodiments of the present invention can also be arbitrarily combined, as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A scour-resistant tundish impact plate, characterized in that: Contains the following components in parts by weight: The composite binder is a composite of water glass and phenolic resin.

2. The erosion-resistant tundish impact plate according to claim 1, characterized in that: The MgO in the sintered magnesia is ≥95%.

3. The erosion-resistant tundish impact plate according to claim 1, characterized in that: The fiber length of the nylon is 3 to 5 mm.

4. The erosion-resistant tundish impact plate according to claim 1, characterized in that: The weight ratio of water glass to phenolic resin in the composite binder is 1:

2.

5. The erosion-resistant tundish impact plate according to claim 1, characterized in that: The silicon content in the metal silicon powder is ≥98%; the particle size of the metal silicon powder is ≤325 meshes; the aluminum content in the metal aluminum powder is ≥99%; the particle size of the metal aluminum powder is ≤325 meshes.

6. A method for preparing a scour-resistant tundish impact plate according to claim 1, characterized in that: The specific steps are as follows: 1) Prepare the components according to the above ratio, put sintered magnesia with a particle size of 1 to 3 mm, sintered magnesia with a particle size of 0.088 to 1 mm, and plate-shaped corundum with a particle size of 0.088 to 1 mm into a mixer and stir for 3 to 5 minutes; then add ultrafine graphite with a particle size of ≤0.018 mm, sintered magnesia with a particle size of ≤0.088 mm, and plate-shaped corundum with a particle size of ≤0.088 mm into the mixer and stir for 3 to 5 minutes; then add a composite binder, metal silicon powder, metal aluminum powder, titanium dioxide, and nylon, and continue stirring for 8 to 12 minutes to finally obtain a mixture; 2) placing the mixture into a mold and pressing it to obtain a molded brick; The molded bricks are dried at 200-250°C for 12-24 hours, cooled, and demoulded to obtain the tundish impact plate.

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