Converter furnace mouth anti-slag gunning material and preparation method thereof

Abstract

The present invention relates to the technical field of converter anti-sticking slag gunning material, and in particular to a converter furnace mouth anti-sticking slag gunning material and a preparation method thereof. The gunning material of the present invention comprises the following components in parts by weight: 30 to 55 parts of recycled waste magnesium carbon brick particles with a particle size of 1 to 3 mm; 60 to 75 parts of recycled waste magnesium carbon brick particles with a particle size of 0.088 to 1 mm; 40 to 50 parts of recycled waste magnesium carbon brick particles with a particle size of ≤0.088 mm; 15 to 25 parts of magnesia sand with a particle size of 1 to 3 mm; 20 to 30 parts of magnesia sand with a particle size of 0.088 to 1 mm; 10 to 15 parts of magnesia sand with a particle size of ≤0.088 mm; 20 to 30 parts of mixed graphite; 15 to 20 parts of sodium hexametaphosphate; 8 to 12 parts of metallic silicon powder; 5 to 8 parts of bentonite; and 3 to 5 parts of nylon. The present invention adopts recycled waste magnesia carbon bricks and magnesia sand as aggregates, so that the gunning material has good slag erosion resistance, thermal shock resistance and strength. By adding nylon to form a mesh-like narrow exhaust channel, it is helpful to quickly diffuse and discharge water vapor, prevent the internal pressure from being too large and causing bursting, avoid shrinkage and cracking of the spray layer and exhaust cracking, and meet the application requirements of anti-slag sticking at the converter furnace mouth.

Description

Technical Field

[0001] The invention relates to the technical field of converter anti-slag gunning material, in particular to a converter furnace mouth anti-slag gunning material and a preparation method thereof. Background Art

[0002] During the converter smelting process, splashing often occurs. The high-temperature molten material splashed from the converter gradually decreases in temperature and increases in viscosity during the falling process, thus adhering to the converter mouth, furnace cap, water tank and other parts. As the sticky slag continues to accumulate and expand, it will eventually lead to the problem of sticky slag at the converter mouth.

[0003] Existing water-based isolation coatings are often used to prevent slag from sticking at the converter furnace mouth. However, due to the rapid evaporation of the liquid components in the slurry during the high-temperature process, the spray layer shrinks and cracks, and the exhaust cracks. In addition, the spray layer is relatively thin, and there are problems such as slag erosion, penetration, peeling, and incomplete coverage of the sticky slag surface, which affect the effect of preventing slag from sticking and may even make it difficult to clean the sticky slag. Summary of the invention

[0004] In order to overcome the defects of the prior art, the technical problem solved by the present invention is to provide a converter furnace mouth anti-slag gunning material and a preparation method thereof. The gunning material provided by the present invention has good anti-erosion and anti-cracking characteristics.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A converter furnace mouth anti-slag gunning material comprises the following components in parts by weight:

[0007]

[0008]

[0009] The magnesia is any one of high-purity sintered magnesia or fused magnesia, wherein MgO is ≥ 95%.

[0010] The mixed graphite consists of flake graphite and amorphous graphite; the C content of the flake graphite is ≥95%, and the particle size of the flake graphite is ≤325 meshes; the C content of the amorphous graphite is ≥97%, and the particle size of the amorphous graphite is ≤200 meshes.

[0011] The silicon content of the metal silicon powder is ≥98%; the particle size of the metal silicon powder is ≤325 meshes.

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

[0013] A method for preparing a converter furnace mouth anti-sticking slag gunning material, the specific method is as follows:

[0014] The components are prepared according to the above ratios, and recycled waste magnesium carbon brick particles with a particle size of ≤0.088mm and magnesia sand with a particle size of ≤0.088mm are added to the mixer and stirred for 5 to 8 minutes; then the mixed graphite and metallic silicon powder are added to the mixer and stirred for 5 to 8 minutes; then nylon is added to the mixer and stirred for 8 to 12 minutes; finally, recycled waste magnesium carbon brick particles with a particle size of 1 to 3mm, recycled waste magnesium carbon brick particles with a particle size of 0.088 to 1mm, magnesia sand with a particle size of 1 to 3mm, magnesia sand with a particle size of 0.088 to 1mm, sodium hexametaphosphate and bentonite are added to the mixer and stirred for 5 to 8 minutes.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1) In the anti-sticking slag gunning material of the present invention, recycled waste magnesia carbon bricks and magnesia sand are used as aggregates, so that the gunning material has good slag erosion resistance, thermal shock resistance and strength. By adding nylon to form a mesh-like narrow exhaust channel, it is helpful to quickly diffuse and discharge water vapor, prevent the internal pressure from being too large to cause bursting, avoid shrinkage and cracking of the spray layer and exhaust cracking, and meet the application requirements of anti-sticking slag at the converter furnace mouth.

[0017] 2) The use of mixed graphite in the present invention is conducive to improving the bulk density of the gunning material, and can improve its flexural strength and thermal shock stability at high temperatures.

[0018] 3) When preparing the gunning material, the present invention first adds small particles of recycled waste magnesium carbon brick particles, magnesia sand, mixed graphite, and metallic silicon powder into a mixer for mixing, and then adds nylon, which is beneficial to the uniform dispersion of nylon fibers. Finally, adding large particles of recycled waste magnesium carbon brick particles and magnesia sand is beneficial to the overall uniform mixing, thereby improving the service life of the gunning material. DETAILED DESCRIPTION

[0019] The specific embodiments of the present invention are further described below:

[0020] Example 1

[0021] The present invention provides a converter furnace mouth anti-sticking slag gunning material, comprising the following components in parts by weight:

[0022]

[0023]

[0024] The magnesia is any one of high-purity sintered magnesia or fused magnesia, wherein MgO is ≥ 95%.

[0025] The mixed graphite consists of flake graphite and amorphous graphite; the C content of the flake graphite is ≥95%, and the particle size of the flake graphite is ≤325 meshes; the C content of the amorphous graphite is ≥97%, and the particle size of the amorphous graphite is ≤200 meshes.

[0026] The silicon content of the metal silicon powder is ≥98%; the particle size of the metal silicon powder is ≤325 meshes.

[0027] The fiber length of the nylon is 3 to 5 mm.

[0028] A method for preparing a converter furnace mouth anti-sticking slag gunning material, the specific method is as follows:

[0029] The components are prepared according to the above ratios, and recycled waste magnesium carbon brick particles with a particle size of ≤0.088mm and magnesia sand with a particle size of ≤0.088mm are added to the mixer and stirred for 6 minutes; then the mixed graphite and metallic silicon powder are added to the mixer and stirred for 6 minutes; then nylon is added to the mixer and stirred for 10 minutes; finally, recycled waste magnesium carbon brick particles with a particle size of 1-3mm, recycled waste magnesium carbon brick particles with a particle size of 0.088-1mm, magnesia sand with a particle size of 1-3mm, magnesia sand with a particle size of 0.088-1mm, sodium hexametaphosphate and bentonite are added to the mixer and stirred for 5 minutes.

[0030] Example 2

[0031] The present invention provides a converter furnace mouth anti-sticking slag gunning material, comprising the following components in parts by weight:

[0032]

[0033]

[0034] The magnesia is any one of high-purity sintered magnesia or fused magnesia, wherein MgO is ≥ 95%.

[0035] The mixed graphite consists of flake graphite and amorphous graphite; the C content of the flake graphite is ≥95%, and the particle size of the flake graphite is ≤325 meshes; the C content of the amorphous graphite is ≥97%, and the particle size of the amorphous graphite is ≤200 meshes.

[0036] The silicon content of the metal silicon powder is ≥98%; the particle size of the metal silicon powder is ≤325 meshes.

[0037] The fiber length of the nylon is 3 to 5 mm.

[0038] A method for preparing a converter furnace mouth anti-sticking slag gunning material, the specific method is as follows:

[0039] The components are prepared according to the above ratios, and recycled waste magnesium carbon brick particles with a particle size of ≤0.088mm and magnesia sand with a particle size of ≤0.088mm are added to the mixer and stirred for 7 minutes; then the mixed graphite and metallic silicon powder are added to the mixer and stirred for 7 minutes; then nylon is added to the mixer and stirred for 10 minutes; finally, recycled waste magnesium carbon brick particles with a particle size of 1-3mm, recycled waste magnesium carbon brick particles with a particle size of 0.088-1mm, magnesia sand with a particle size of 1-3mm, magnesia sand with a particle size of 0.088-1mm, sodium hexametaphosphate and bentonite are added to the mixer and stirred for 7 minutes.

[0040] 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 explain 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 converter furnace mouth anti-slag gunning material, characterized in that: Contains the following components in parts by weight:

2. The converter mouth anti-slag gunning material according to claim 1, characterized in that: The magnesia is any one of high-purity sintered magnesia or fused magnesia, wherein MgO is ≥ 95%.

3. The converter mouth anti-slag gunning material according to claim 1, characterized in that: The mixed graphite consists of flake graphite and amorphous graphite; the C content of the flake graphite is ≥95%, and the particle size of the flake graphite is ≤325 meshes; the C content of the amorphous graphite is ≥97%, and the particle size of the amorphous graphite is ≤200 meshes.

4. The converter mouth anti-slag gunning material according to claim 1, characterized in that: The silicon content of the metal silicon powder is ≥98%; the particle size of the metal silicon powder is ≤325 meshes.

5. The converter mouth anti-slag gunning material according to claim 1, characterized in that: The fiber length of the nylon is 3 to 5 mm.

6. A method for preparing a converter furnace mouth anti-slag gunning material as claimed in claim 1, characterized in that: The specific method is as follows: The components are prepared according to the above ratios, and recycled waste magnesium carbon brick particles with a particle size of ≤0.088mm and magnesia sand with a particle size of ≤0.088mm are added to the mixer and stirred for 5 to 8 minutes; then the mixed graphite and metallic silicon powder are added to the mixer and stirred for 5 to 8 minutes; then nylon is added to the mixer and stirred for 8 to 12 minutes; finally, recycled waste magnesium carbon brick particles with a particle size of 1 to 3mm, recycled waste magnesium carbon brick particles with a particle size of 0.088 to 1mm, magnesia sand with a particle size of 1 to 3mm, magnesia sand with a particle size of 0.088 to 1mm, sodium hexametaphosphate and bentonite are added to the mixer and stirred for 5 to 8 minutes.

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