Magnesium-based dry vibration material and preparation method thereof

Abstract

The invention relates to a magnesian dry vibrating material and a preparation method thereof. The magnesian dry vibrating material comprises the following components in parts by weight: fused magnesite with the particle size of 1-3mm, fused magnesite with the particle size of 0.088-1mm, fused magnesite with the particle size of less than or equal to 0.088 mm, water glass, bischofite hexahydrate, kaolin, alumina micro powder and silica micro powder. The preparation method comprises the following specific steps: sequentially adding the fused magnesite with the particle size of 1-3mm, the fused magnesite with the particle size of 0.088-1mm and the fused magnesite with the particle size of less than or equal to 0.088 mm into a stirrer according to the ratio, and stirring for 5-10mm; then adding the water glass, the clofite hexahydrate and the kaolin, and continuously stirring for 3-5 minutes; finally, adding the aluminum oxide micro powder and the silicon micro powder into a stirrer, and stirring for 8-15 minutes to finally obtain a mixed material; and carrying out vibration molding on the mixed material, then baking at 200-250 DEG C for 3-5 hours, and demolding. The environment-friendly binding agent water glass is adopted to replace phenolic resin, so that the bonding strength is guaranteed, and meanwhile, generation and release of harmful gas are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of refractory materials, in particular to a magnesium dry vibrating material and a preparation method thereof. Background Art

[0002] Magnesium dry vibrating material is mainly used for the tundish in the continuous casting process of steelmaking. The tundish is a key component of the continuous casting system in the steel industry. It is a device for molten steel transfer between the ladle and the crystallizer. Its function is to stabilize the temperature of the molten steel and float the inclusions in the molten steel. When there is a short-term shortage of molten steel or when the ladle is replaced, it can ensure continuous casting. Its service life has an important impact on the steel process.

[0003] The application of magnesium dry vibrating material in the tundish can significantly increase the life of the tundish and reduce the replacement frequency, thereby improving production efficiency and steel quality.

[0004] Existing magnesium dry vibrating materials mostly use phenolic resin as a binder. Although it has high bonding strength, it will produce irritating gases such as ammonia, formaldehyde and free phenol during use, polluting the environment and endangering the health of workers. The carbon and hydrogen after carbonization have obvious carbon and hydrogen increasing effects, resulting in carbon increase in molten steel, which cannot meet the production needs of ultra-low carbon steel and clean steel. 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 magnesium dry vibrating material and a preparation method thereof. The present invention adopts an environmentally friendly binder to replace phenolic resin, which ensures the bonding strength while reducing the generation and release of harmful gases.

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

[0007] A magnesium dry vibrating material comprises the following components in parts by weight:

[0008]

[0009]

[0010] The MgO content in the fused magnesia is ≥95%.

[0011] The Al in the alumina powder 2 O 3 Content ≥98%; Alumina powder particle size ≤325 mesh.

[0012] The weight percentage of SiO2 in the silicon micropowder is ≥93%; and the particle size of the silicon micropowder is ≤325 meshes.

[0013] A method for preparing a magnesium dry vibrating material, the specific steps are as follows:

[0014] 1) According to the above ratio, fused magnesia with a particle size of 1 to 3 mm, fused magnesia with a particle size of 0.088 to 1 mm, and fused magnesia with a particle size of ≤0.088 mm are sequentially added into a mixer and stirred for 5 to 10 mm;

[0015] 2) Then add water glass, bischofite and kaolin and continue stirring for 3 to 5 minutes; finally, add alumina powder and silicon powder into the mixer and stir for 8 to 15 minutes to finally obtain a mixed material;

[0016] 3) The mixed material is vibrated and molded, and then baked at 200-250° C. for 3-5 hours and demolded.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) The present invention adopts environmentally friendly binder water glass to replace phenolic resin, which can reduce the generation and release of harmful gases and reduce environmental pollution.

[0019] 2) In the present invention, part of the water glass and the hexahydrate bischofite can react to generate a magnesium silicate substance, which is precipitated in the vibration material, can maintain stable physical and chemical properties under high temperature environment, and can improve the refractoriness and corrosion resistance of the vibration material; in addition, a small amount of silicon micropowder is added in the present invention to generate hydrated magnesium silicate, further improving the refractory performance of the vibration material and extending the service life of the tundish. DETAILED DESCRIPTION

[0020] The specific implementation mode of the present invention is further described below:

[0021] Example 1

[0022] The present invention provides a magnesium dry vibrating material, comprising the following components in parts by weight:

[0023]

[0024] The MgO content in the fused magnesia is ≥95%.

[0025] The Al in the alumina powder 2 O 3 Content ≥98%; Alumina powder particle size ≤325 mesh.

[0026] The weight percentage of SiO2 in the silicon micropowder is ≥93%; and the particle size of the silicon micropowder is ≤325 meshes.

[0027] A method for preparing a magnesium dry vibrating material, the specific steps are as follows:

[0028] 1) According to the above ratio, fused magnesia with a particle size of 1 to 3 mm, fused magnesia with a particle size of 0.088 to 1 mm, and fused magnesia with a particle size of ≤0.088 mm are sequentially added into a mixer and stirred until 6 mm;

[0029] 2) Then add water glass, bischofite and kaolin and continue stirring for 3 minutes; finally, add alumina powder and silicon powder into the mixer and stir for 10 minutes to finally obtain a mixed material;

[0030] 3) The mixed material is vibrated and molded, and then baked at 200-250° C. for 5 hours and demolded.

[0031] Example 2

[0032] The present invention provides a magnesium dry vibrating material, comprising the following components in parts by weight:

[0033]

[0034] The MgO content in the fused magnesia is ≥95%.

[0035] The Al in the alumina powder 2 O 3 Content ≥98%; Alumina powder particle size ≤325 mesh.

[0036] The weight percentage of SiO2 in the silicon micropowder is ≥93%; and the particle size of the silicon micropowder is ≤325 meshes.

[0037] A method for preparing a magnesium dry vibrating material, the specific steps are as follows:

[0038] 1) According to the above ratio, fused magnesia with a particle size of 1 to 3 mm, fused magnesia with a particle size of 0.088 to 1 mm, and fused magnesia with a particle size of ≤0.088 mm are sequentially added into a mixer and stirred until 8 mm;

[0039] 2) Then add water glass, bischofite and kaolin and continue stirring for 5 minutes; finally, add alumina powder and silicon powder into the mixer and stir for 8 to 15 minutes to finally obtain a mixed material;

[0040] 3) The mixed material is vibrated and molded, and then baked at 200-250° C. for 5 hours and demolded.

[0041] 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 magnesium dry vibrating material, characterized in that: Contains the following components in parts by weight:

2. A magnesium dry vibrating material according to claim 1, characterized in that: The MgO content in the fused magnesia is ≥95%.

3. A magnesium dry vibrating material according to claim 1, characterized in that: The Al2O3 content of the alumina micropowder is ≥98%; and the particle size of the alumina micropowder is ≤325 meshes.

4. A magnesium dry vibrating material according to claim 1, characterized in that: The weight percentage of SiO2 in the silicon micropowder is ≥93%; and the particle size of the silicon micropowder is ≤325 meshes.

5. A method for preparing a magnesium dry vibrating material according to claim 1, characterized in that: The specific steps are as follows: 1) According to the above ratio, fused magnesia with a particle size of 1 to 3 mm, fused magnesia with a particle size of 0.088 to 1 mm, and fused magnesia with a particle size of ≤0.088 mm are sequentially added into a mixer and stirred for 5 to 10 mm; 2) Then add water glass, bischofite and kaolin and continue stirring for 3 to 5 minutes; finally, add alumina powder and silicon powder into the mixer and stir for 8 to 15 minutes to finally obtain a mixed material; 3) The mixed material is vibrated and molded, and then baked at 200-250° C. for 3-5 hours and demolded.

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