Sealing bowl for long nozzle of continuous casting ladle and preparation method thereof

Abstract

The invention discloses a sealing bowl for a long shroud of a continuous casting ladle, comprising a main body and a flow channel, and is characterized in that the main body has five layers in cross section, which are, from inside to outside, an internal easily carbonized material layer, an internal soft refractory material layer, a steel wire mesh layer, an external soft refractory material layer and an external easily carbonized material layer. The invention also discloses a preparation method of the sealing bowl for the long shroud of a continuous casting ladle.

Description

Technical field:

[0002] The invention relates to a refractory material and a preparation method thereof, in particular to a sealing bowl for a long water nozzle of a continuous casting ladle and a preparation method thereof. Background technology:

[0004] In the prior art, the sealing bowl for the long nozzle of the continuous casting ladle is usually made of hard aluminum silicate asbestos, and is mainly used between the long nozzle and the ladle outlet of the continuous casting ladle. The maximum operating temperature of the hard sealing bowl made of aluminum silicate asbestos is 1260°C (the temperature of the molten steel when pouring molten steel is 1550°C). The hard product is not tightly sealed when used between the long nozzle and the ladle outlet. During use, air is sucked into the molten steel. Especially after 30 minutes of use, as the temperature rises, the aluminum silicate asbestos is pulverized, the gaps increase, and more air is sucked in, which increases oxygen in the molten steel and seriously affects the quality of the molten steel. Summary of the invention:

[0006] The technical problem to be solved by the present invention is to provide a sealing bowl for a long nozzle of a continuous casting ladle, which comprises a body and a flow channel, and is characterized in that the cross section of the body has five layers, which are, from the inside to the outside, an inner easily carbonized material layer, an inner soft refractory material layer, a steel wire mesh layer, an outer soft refractory material layer and an outer easily carbonized material layer.

[0007] A further technical feature of the present invention is:

[0008] The inner and outer carbonizable material layers are graphite paper or kraft paper, and have a thickness of 0.5-1 mm.

[0009] The inner soft refractory material layer and the outer soft refractory material layer are aluminum-carbon refractory materials.

[0010] The height of the internal easily carbonizable material layer from top to bottom is only 4 / 5 to 2 / 3 of the height of the main body.

[0011] The height of the outer easily carbonizable material layer from bottom to top is only 4 / 5 to 2 / 3 of the height of the main body.

[0012] Another aspect of the present invention provides a method for preparing a sealing bowl for a long shroud of a continuous casting ladle, comprising the following steps:

[0013] 1) Material preparation: Cut the mixed and ground soft refractory materials into external soft refractory materials and internal soft refractory materials according to the given size, cut the easily carbonized materials into internal easily carbonized materials and external easily carbonized materials according to the given size, and cut the wire mesh into the given size;

[0014] 2) Mold installation: First install the external easy-to-carbonize material on the inner wall of the bowl-shaped mold, then place the prepared external soft refractory material, then place the wire mesh of the specified size, then place the internal soft refractory material, then place the internal easy-to-carbonize material, and then install the core punch;

[0015] 3) Stamping: Apply pressure to the core punch. When the core punch reaches the predetermined limit position, use a knife to trim the soft material extruded from the upper edge of the mold, pull out the core punch, and take out the finished product, that is, the sealing bowl for the long water inlet of the continuous casting ladle.

[0016] Another further technical feature of the present invention is:

[0017] The inner and outer carbonizable material layers are graphite paper or kraft paper, and have a thickness of 0.5-1 mm.

[0018] The inner soft refractory material layer and the outer soft refractory material layer are aluminum-carbon refractory materials.

[0019] The height of the internal easily carbonizable material layer from top to bottom is only 4 / 5 to 2 / 3 of the height of the main body.

[0020] The height of the outer easily carbonizable material layer from bottom to top is only 4 / 5 to 2 / 3 of the height of the main body.

[0021] The beneficial effects of the present invention are:

[0022] Since the sealing bowl for the long water nozzle of the continuous casting ladle of the present invention is made of aluminum carbon refractory material, the maximum use temperature is 1580℃ (the temperature of the molten steel when pouring molten steel is 1550℃), the material is soft at room temperature, but because there is a steel wire mesh layer in the middle to support it, and there are easy-to-carbonize material layers on the outside and inside, it will not be deformed during installation and placement; during installation and use, because it is a soft material, when it is squeezed between the long water nozzle and the lower water nozzle of the ladle during installation, all the gaps will be tightly sealed, especially the inner The height of the inner easily carbonized material layer from top to bottom is only 4 / 5 to 2 / 3 of the height of the main body, and the height of the outer easily carbonized material layer from bottom to top is only 4 / 5 to 2 / 3 of the height of the main body. In this way, the soft refractory material layer inside the sealing bowl directly cooperates with the lower water outlet of the ladle, and the soft refractory material layer outside the sealing bowl directly cooperates with the long water outlet of the continuous casting ladle. The sealing effect will be more perfect after extrusion during installation. In addition, the aluminum-carbon material has good high temperature resistance, does not powder when used at high temperature, and will not absorb air into the molten steel to affect the quality of the molten steel. Description of the drawings:

[0024] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention in practical application;

[0025] Figure 2 for Figure 1An enlarged cross-sectional view of the embodiment shown. Specific implementation method:

[0027] The present invention will be further described below in conjunction with the accompanying drawings:

[0028] Reference Figure 1 and Figure 2 A sealing bowl for a long nozzle of a continuous casting ladle, comprising a body 1 and a flow channel 2, characterized in that the body section has five layers, which are, from the inside to the outside, an internal easily carbonized material layer 101, an internal soft refractory material layer 102, a steel mesh layer 103, an external soft refractory material layer 104 and an external easily carbonized material layer 105. In this embodiment, the internal easily carbonized material layer 101 and the external easily carbonized material layer 105 are graphite paper or kraft paper with a thickness of 0.5-1 mm; the internal soft refractory material layer 102 and the external soft refractory material layer 104 are aluminum carbon refractory materials; the height of the internal easily carbonized material layer 101 from top to bottom is only 4 / 5 to 2 / 3 of the height of the body; the height of the external easily carbonized material layer 105 from bottom to top is only 4 / 5 to 2 / 3 of the height of the body.

[0029] The preparation method of the embodiment shown in the figure comprises the following steps:

[0030] 1) Material preparation: Cut the mixed and ground soft refractory materials into external soft refractory materials and internal soft refractory materials according to the given size, cut the easily carbonized materials into internal easily carbonized materials and external easily carbonized materials according to the given size, and cut the wire mesh into the given size;

[0031] 2) Mold installation: First install the external easy-to-carbonize material on the inner wall of the bowl-shaped mold, then place the prepared external soft refractory material, then place the wire mesh of the specified size, then place the internal soft refractory material, then place the internal easy-to-carbonize material, and then install the core punch;

[0032] 3) Stamping: Apply pressure to the core punch. When the core punch reaches the predetermined limit position, use a knife to trim the soft material extruded from the upper edge of the mold, pull out the core punch, and take out the finished product, that is, the sealing bowl for the long water inlet of the continuous casting ladle.

[0033] Since the sealing bowl for the long water nozzle of the continuous casting ladle of the present invention is made of aluminum carbon refractory material, the maximum use temperature is 1580℃ (the temperature of the molten steel when pouring molten steel is 1550℃), the material is soft at room temperature, but because there is a steel wire mesh layer in the middle to support it, and there are carbonized material layers on the outside and inside, it will not be deformed during installation and placement; during installation and use, because it is a soft material, when it is squeezed during installation between the long water nozzle 3 of the ladle and the lower water nozzle 4 of the ladle, all the gaps will be sealed tightly, especially the carbonized material inside The height of layer 101 from top to bottom is only 4 / 5 to 2 / 3 of the height of the main body, and the height of the external easily carbonized material layer 105 from bottom to top is only 4 / 5 to 2 / 3 of the height of the main body. In this way, the soft refractory material layer 102 inside the sealing bowl directly cooperates with the ladle downspout 4, and the soft refractory material layer 104 outside the sealing bowl directly cooperates with the long water inlet 3 of the continuous casting ladle. The sealing effect will be more perfect after extrusion during installation. In addition, the aluminum-carbon material has good high temperature resistance, does not powderize when used at high temperature, and will not absorb air into the molten steel to affect the quality of the molten steel.

[0034] The technical content and technical features of the present invention have been disclosed as above, but it can be understood that under the creative idea of ​​the present invention, those skilled in the art can make various changes and improvements to the above structure, including the combination of technical features disclosed or claimed separately here, and obviously including other combinations of these features. These deformations and / or combinations all fall within the technical field involved in the present invention and fall within the protection scope of the claims of the present invention, and the protection scope of the present invention shall be subject to the claims.

Claims

1. A sealing bowl for a long nozzle of a continuous casting ladle, comprising a body and a flow channel, characterized in that The cross-section of the main body has five layers, which are, from inside to outside, an internal easily carbonized material layer, an internal soft refractory material layer, a wire mesh layer, an external soft refractory material layer and an external easily carbonized material layer. The height of the internal easily carbonized material layer is only 4 / 5 to 2 / 3 of the height of the main body from top to bottom, and the height of the external easily carbonized material layer is only 4 / 5 to 2 / 3 of the height of the main body from bottom to top.

2. The sealing bowl for the long shroud of the continuous casting ladle according to claim 1, characterized in that: The inner and outer carbonizable material layers are graphite paper or kraft paper, and have a thickness of 0.5-1 mm.

3. The sealing bowl for the long shroud of the continuous casting ladle according to claim 1 or claim 2, characterized in that: The inner soft refractory material layer and the outer soft refractory material layer are aluminum-carbon refractory materials.

4. The method for preparing a sealing bowl for a continuous casting ladle shroud as claimed in any one of claims 1 to 3, characterized in that The steps include: 1) Material preparation: Cut the mixed and ground soft refractory materials into external soft refractory materials and internal soft refractory materials according to the given size, cut the easily carbonized materials into internal easily carbonized materials and external easily carbonized materials according to the given size, and cut the wire mesh into the given size; 2) Mold installation: First install the external easy-to-carbonize material on the inner wall of the bowl-shaped mold, then place the prepared external soft refractory material, then place the wire mesh of the specified size, then place the internal soft refractory material, then place the internal easy-to-carbonize material, and then install the core punch; 3) Stamping: Apply pressure to the core punch. When the core punch reaches the predetermined limit position, use a knife to trim the soft material extruded from the upper edge of the mold, pull out the core punch, and take out the finished product, that is, the sealing bowl for the long water inlet of the continuous casting ladle.

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