Steel ladle permanent lining ramming material and preparation method thereof

Abstract

The invention relates to a steel ladle permanent lining ramming material. The environment-friendly ramming material is prepared from the following raw materials in parts by weight: 70-80 parts of alumina; 50 to 60 parts of brown aluminum oxide; 10 to 20 parts of mullite powder; 8-15 parts of kyanite powder; 8-12 parts of graphite powder; 5-10 parts of alumina powder; 5-8 parts of metal silicon powder; 4-6 parts of metal aluminum powder; 10-15 parts of liquid phenolic resin; and 4-10 parts of plastic clay. The mullite and the kyanite are added, so that the refractoriness and the thermal shock resistance of the ramming material can be improved, the volume of the ramming material can be stable, and the service life of a steel ladle lining is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of refractory materials, in particular to a ramming material for a permanent lining of a ladle and a preparation method thereof. Background Art

[0002] The permanent lining of the ladle is an important part of the ladle lining, and its main function is heat preservation and insurance. The heat preservation function is to reduce the heat loss of molten steel and reduce the temperature of the steel structure shell of the ladle, thereby extending the service life of the ladle. The insurance function is that when the working layer seeps steel or even melts through, the permanent lining can block the molten steel and prevent it from leaking steel through the ladle, thereby increasing the service life of the metal shell of the ladle. The maximum use of the working layer lining can increase the service life of the ladle, improve the safety of use, and reduce the consumption of refractory materials.

[0003] At present, the construction methods of permanent lining of ladle include refractory brick masonry, integral casting and ramming material vibration. Regarding ramming material vibration, Chinese patent CN200810190947.8 discloses a ramming material for permanent lining of ladle and its production method. The ramming material provided by the invention has simple composition and convenient construction, and has achieved certain effects. However, it was found in the application process that shrinkage cracks appeared after the lining served for two laps, which seriously affected the service life of the ladle. 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 ramming mass for permanent lining of a ladle and a preparation method thereof. The invention adds mullite and kyanite to improve the refractoriness and thermal shock resistance of the ramming mass, and can stabilize the volume of the ramming mass, thereby increasing the service life of the ladle lining.

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

[0006] A ramming mass for permanent lining of a ladle, wherein the environmentally friendly ramming mass is made of the following raw materials in parts by weight:

[0007]

[0008]

[0009] The particles of alumina are ≤0.325mm; the particles of brown corundum are ≤0.068mm; the particles of graphite powder are ≤0.03mm; the particles of mullite powder and kyanite powder are both ≤0.16mm; the particles of alumina powder, metallic silicon powder and metallic aluminum powder are all ≤0.025mm.

[0010] The purity of alumina is ≥92%; the purity of brown corundum is ≥95%; the purity of graphite powder is ≥96%; the purity of alumina powder is ≥98.5%; the purity of metal silicon powder is ≥99%; and the purity of metal aluminum powder is ≥99%.

[0011] A method for preparing a ramming material for a permanent lining of a ladle, the specific steps are as follows:

[0012] 1) Weigh the ingredients according to the above ratio, add alumina, brown corundum, mullite powder and kyanite powder into a mixer and mix them for 3 to 5 minutes;

[0013] 2) adding graphite powder, alumina powder, metal silicon powder and metal aluminum powder to the mixture in step 1) and mixing for 5 to 8 minutes;

[0014] 3) adding liquid phenolic resin and plastic clay to the mixture in step 2) and mixing for 5 to 8 minutes;

[0015] 4) The mixed material in step 3) is subjected to wheel rolling and extrusion to obtain a baking-free and environment-friendly ramming material.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1) A certain amount of mullite is added to the aggregate of the present invention, so as to improve the thermal shock resistance of the ramming material; and a certain amount of kyanite powder is added to ensure the volume stability of the ramming material during use and to improve the service life of the ladle lining.

[0018] 2) When the present invention uses liquid phenolic resin as a binder, it does not need to add water or bake and can be directly put into use, thus causing little pollution to the environment. DETAILED DESCRIPTION

[0019] The specific implementation mode of the present invention is further described below:

[0020] Example 1

[0021] A ramming mass for permanent lining of a ladle, wherein the environmentally friendly ramming mass is made of the following raw materials in parts by weight:

[0022]

[0023]

[0024] The particles of alumina are ≤0.325mm; the particles of brown corundum are ≤0.068mm; the particles of graphite powder are ≤0.03mm; the particles of mullite powder and kyanite powder are both ≤0.16mm; the particles of alumina powder, metallic silicon powder and metallic aluminum powder are all ≤0.025mm.

[0025] The purity of the alumina is ≥92%; the purity of the brown corundum is ≥95%; the purity of the graphite powder is ≥96%; the purity of the alumina powder is ≥98.5%; the purity of the metal silicon powder is ≥99%; and the purity of the metal aluminum powder is ≥99%.

[0026] A method for preparing a ramming material for a permanent lining of a ladle, the specific steps are as follows:

[0027] 1) Weigh the ingredients according to the above ratio, add alumina, brown corundum, mullite powder and kyanite powder into a mixer and mix them for 3 minutes;

[0028] 2) adding graphite powder, alumina powder, metal silicon powder and metal aluminum powder to the mixture in step 1) and mixing for 5 minutes;

[0029] 3) adding liquid phenolic resin and plastic clay to the mixture in step 2) and mixing for 8 minutes;

[0030] The mixed material in step 3) is subjected to wheel rolling and extrusion to obtain a baking-free and environment-friendly ramming material.

[0031] Example 2

[0032] A ramming mass for permanent lining of a ladle, wherein the environmentally friendly ramming mass is made of the following raw materials in parts by weight:

[0033]

[0034] The particles of alumina are ≤0.325mm; the particles of brown corundum are ≤0.068mm; the particles of graphite powder are ≤0.03mm; the particles of mullite powder and kyanite powder are both ≤0.16mm; the particles of alumina powder, metallic silicon powder and metallic aluminum powder are all ≤0.025mm.

[0035] The purity of alumina is ≥92%; the purity of brown corundum is ≥95%; the purity of graphite powder is ≥96%; the purity of alumina powder is ≥98.5%; the purity of metal silicon powder is ≥99%; and the purity of metal aluminum powder is ≥99%.

[0036] A method for preparing a ramming material for a permanent lining of a ladle, the specific steps are as follows:

[0037] 1) Weigh the ingredients according to the above ratio, add alumina, brown corundum, mullite powder and kyanite powder into a mixer and mix them for 3.5 minutes;

[0038] 2) adding graphite powder, alumina powder, metal silicon powder and metal aluminum powder to the mixture in step 1) and mixing for 6 minutes;

[0039] 3) adding liquid phenolic resin and plastic clay to the mixture in step 2) and mixing for 8 minutes;

[0040] 4) The mixed material in step 3) is subjected to wheel rolling and extrusion to obtain a baking-free and environment-friendly ramming material.

[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 ramming material for permanent lining of a ladle, characterized in that: The environmentally friendly ramming mass is made of the following raw materials in parts by weight:

2. A ramming material for permanent lining of a ladle according to claim 1, characterized in that: The particles of alumina are ≤0.325mm; the particles of brown corundum are ≤0.068mm; the particles of graphite powder are ≤0.03mm; the particles of mullite powder and kyanite powder are both ≤0.16mm; the particles of alumina powder, metallic silicon powder and metallic aluminum powder are all ≤0.025mm.

3. The ramming material for permanent lining of ladle according to claim 1, characterized in that: The purity of alumina is ≥92%; the purity of brown corundum is ≥95%; the purity of graphite powder is ≥96%; Alumina powder purity ≥98.5%; Metal silicon powder purity ≥99%; The purity of aluminum metal powder is ≥99%.

4. A method for preparing a ramming mass for a permanent lining of a ladle according to any one of claims 1 to 3, characterized in that: The specific steps are as follows: 1) Weigh the ingredients according to the above ratio, add alumina, brown corundum, mullite powder and kyanite powder into a mixer and mix them for 3 to 5 minutes; 2) adding graphite powder, alumina powder, metal silicon powder and metal aluminum powder to the mixture in step 1) and mixing for 5 to 8 minutes; 3) adding liquid phenolic resin and plastic clay to the mixture in step 2) and mixing for 5 to 8 minutes; 4) The mixed material in step 3) is subjected to wheel rolling and extrusion to obtain a baking-free and environment-friendly ramming material.

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