molten metal container

Abstract

To provide a molten metal container capable of improving the heat insulating effect and minimizing the heat loss of the molten metal without significantly increasing the volume of the container. [Solution] The steel mill comprises an outer iron skin layer, a refractory layer laminated inside the outer iron skin layer to form a space for accommodating molten metal, an insulating board layer interposed between the refractory layer and the outer iron skin layer, and an insulating paint layer applied to at least one of the outer surface and the inner surface of the outer iron skin layer, the insulating paint layer containing a ceramic binder and a number of hollow particles, the insulating board layer containing magnesium oxide (MgO) and silicon dioxide (SiO2) components, and the ceramic binder containing one or more elements selected from the group consisting of silicon (Si), aluminum (Al), titanium (Ti), zirconium (Zr), calcium (Ca), magnesium (Mg), yttrium (Y), and cerium (Ce).

Description

[Technical Field]

[0001] The present invention relates to a molten metal container, and more particularly to a molten metal container that can improve heat insulation effect and minimize heat loss of molten metal without significantly increasing the volume of the container. [Background technology]

[0002] Molten metal vessels, also known as ladles, are used to transport or process molten metal in steelworks and other facilities. The molten metal can be transferred to a tundish for casting while still in the vessel, where it can undergo refining processes such as temperature control, composition adjustment, impurity removal, and degassing.

[0003] The molten metal container must minimize heat loss from the molten metal during transfer or processing. Therefore, the molten metal container has an outer steel shell and a refractory layer laminated on the inner surface of the steel shell to form a space for containing the molten metal. The refractory layer prevents the heat of the molten metal from being transferred to the steel shell, thereby preventing a sudden drop in the temperature of the molten metal.

[0004] Possible methods for improving the insulation of a molten metal container include increasing the thickness of the refractory layer or adjusting the composition of the refractory layer to reduce thermal conductivity. However, increasing the thickness of the refractory layer has the disadvantage of excessively increasing the weight of the molten metal container and reducing the space available to accommodate the molten metal. Technological advances in adjusting the composition of the refractory to reduce thermal conductivity have also reached their limits, making it difficult to develop better technologies. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention aims to provide a molten metal container that can improve the heat insulating effect and minimize heat loss of the molten metal without significantly increasing the volume of the container. [Means for solving the problem]

[0006] According to the present invention, a molten metal container can be provided, comprising: an outer iron skin layer; a refractory layer laminated inside the outer iron skin layer and forming a space for accommodating molten metal; an insulating board layer interposed between the refractory layer and the outer iron skin layer; and a thermal insulating paint layer applied to at least one of an outer surface and an inner surface of the outer iron skin layer, wherein the thermal insulating paint layer includes a ceramic binder and a plurality of hollow particles.

[0007] According to the present invention, a molten metal container can be provided, comprising: an outer iron skin layer; an insulating board layer laminated on an inner surface of the outer iron skin layer; an inner iron skin layer laminated on the inner surface of the insulating board layer; a refractory layer laminated on the inner surface of the inner iron skin layer and forming a space for accommodating molten metal; and an insulating paint layer applied to at least one of the outer surface of the outer iron skin layer, the inner surface of the outer iron skin layer, and the outer surface of the inner iron skin layer and the inner surface of the inner iron skin layer, wherein the insulating paint layer includes a ceramic binder and a plurality of hollow particles.

[0008] The insulation board layer may include magnesium oxide (MgO) and silicon dioxide (SiO2) components.

[0009] The ceramic binder may include at least one selected from the group consisting of silicon (Si), aluminum (Al), titanium (Ti), zirconium (Zr), calcium (Ca), magnesium (Mg), yttrium (Y), and cerium (Ce).

[0010] The plurality of hollow particles may include at least one of silicon dioxide (SiO2), aluminum oxide (Al2O3), and magnesium oxide (MgO) particles having hollow portions.

[0011] The molten metal vessel may further include a plurality of binding devices for connecting and binding the inner iron shell layer and the outer iron shell layer.

[0012] The plurality of fastening devices may include a plurality of fastening bolts that fasten the inner and outer steel skin layers together while penetrating the insulation board layer, and tightly attach the inner and outer steel skin layers to the insulation board layer through fastening. [Effects of the Invention]

[0013] The molten metal container of the present invention further includes an insulating board layer and an insulating paint layer in addition to the refractory layer, thereby significantly improving the insulating effect compared to conventional methods and minimizing heat loss from the molten metal during transportation and handling. Furthermore, compared to conventional methods that increase the thickness of the refractory layer, the container exhibits good insulating effect without significantly increasing the volume or weight of the container. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view of a molten metal container according to a first embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a detailed view of part A in FIG. [Figure 3] 3 shows a modification of the main part of the molten metal container according to the first embodiment of the present invention. [Figure 4] 1 shows the heat insulating effect of the heat insulating paint layer of the molten metal container according to the first embodiment of the present invention in comparison with the prior art. [Figure 5] 1 shows the heat insulating effect of the heat insulating board layer of the molten metal container according to the first embodiment of the present invention in comparison with the prior art. [Figure 6] FIG. 10 is a cross-sectional view of a main part of a molten metal container according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] The present invention will be described in detail below. The following embodiments are presented to fully convey the spirit of the present invention to those skilled in the art, and the present invention is not limited to the embodiments presented herein and may be embodied in other forms. In the drawings, parts that are not relevant to the description may be omitted to clarify the present invention, and the sizes of components may be somewhat exaggerated to facilitate understanding.

[0016] 1 is a cross-sectional view of a molten metal container according to a first embodiment of the present invention. As shown, the molten metal container 100 includes a bottom 101 and a cylindrical side wall 102 extending upward from the periphery of the bottom 101. An opening 103 on the upper side of the side wall 102 can be opened and closed by a separate cover 105.

[0017] The bottom 101 and the side wall 102 are integrally connected to form a receiving space 110 capable of receiving molten metal. The molten metal can be introduced or discharged through an upper opening 103. The molten metal container 100 can be used to transfer molten metal to a subsequent process such as a converter or a tundish, and can also be used to perform refining operations such as temperature control, composition adjustment, impurity removal, and degassing while the molten metal is contained therein.

[0018] The molten metal container 100 accommodates and processes molten metal at temperatures above 1300°C, and therefore requires insulation to maintain the temperature of the molten metal, heat resistance to withstand high temperatures, and rigidity for stable transportation. To meet these requirements, the bottom 101 and side wall 102 of the molten metal container 100 may include an outer steel skin layer 121, a refractory layer 122, an insulating board layer 123, and an insulating paint layer 124, as shown in FIGS. 1 and 2.

[0019] The outer steel skin 121 is an outer structure that maintains the outer shape of the molten metal container 100. The outer steel skin 121 may be made of structural rolled steel having enough rigidity to withstand external impacts applied during transportation and handling of the molten metal container 100, as well as the load and pressure of the molten metal.

[0020] The refractory layer 122 is laminated inside the outer iron skin layer 121 to form the molten metal storage space 110. The refractory layer 122 can be formed by stacking firebricks in multiple layers. The refractory layer 122 has heat resistance and heat insulation properties to withstand high-temperature molten metal, and can be formed using Al2O3-SiO2-based refractory bricks or Al2O3-SiC-C-based refractory bricks.

[0021] The heat insulating board layer 123 is installed between the outer iron skin layer 121 with its outer surface in contact with the inner surface of the outer iron skin layer 121 and its inner surface in contact with the outer surface of the refractory layer 122. The heat insulating board layer 123 is laminated on the inner surface of the outer iron skin layer 121, and the refractory layer 122 is laminated on the inner surface of the heat insulating board layer 123.

[0022] The heat insulating board layer 123 improves heat insulation and reduces heat loss of the molten metal. The heat insulating board layer 123 may be made in the form of a panel from a material containing magnesium oxide (MgO) and silicon dioxide (SiO2), and may be laminated on the inner surface of the outer iron skin layer 121. The heat conductivity coefficient of the heat insulating board layer 123 is 0.1 to 1.0 W / m 2 It has low reactivity with water and is strong enough to withstand the ferrostatic pressure of molten metal.

[0023] The heat insulating paint layer 124 may be applied to the outer surface of the outer iron skin layer 121 as shown in Fig. 2 or to the inner surface of the outer iron skin layer 121 as shown in Fig. 3. Of course, the heat insulating paint layer 124 may be applied to both the outer and inner surfaces of the outer iron skin layer 121.

[0024] The thermal barrier coating layer 124 may include a ceramic binder and a number of hollow particles.

[0025] The plurality of hollow particles may include at least one of silicon dioxide (SiO2), aluminum oxide (Al2O3), and magnesium oxide (MgO) particles having hollow portions.

[0026] The ceramic binder is a material contained in the heat insulating paint layer 124, and serves to adhere or bond to the surface of the outer steel skin layer 121, and to bind and coat the numerous hollow particles dispersed inside.

[0027] The ceramic binder can contain one or more elements selected from the group consisting of silicon (Si), aluminum (Al), titanium (Ti), zirconium (Zr), calcium (Ca), magnesium (Mg), yttrium (Y), and cerium (Ce), which can withstand high temperatures of 1000°C or higher.

[0028] The heat insulating paint layer 124 can be applied to the surface of the outer steel skin layer 121 to a thickness of 1 to 5 mm so as to maintain a stable state and provide excellent heat insulating effects. The application can be performed using an air spray method to maintain a uniform thickness.

[0029] The heat insulating paint layer 124 contains a large number of silicon dioxide (SiO2) particles with hollow spaces, and therefore exhibits excellent heat insulating properties. The heat insulating paint layer 124 has a thermal conductivity of 0.01 to 0.1 W / m, which is the same level as air. 2 It has heat resistance that can withstand temperatures of over 1000°C, so it can maintain a stable coating state even when handling molten metal.

[0030] Figure 4 shows the heat insulating effect of the heat insulating paint layer 124 in comparison with a conventional method. In Figure 4, graph B shows the transition of temperature change of the molten metal placed in a molten metal container to which the heat insulating paint layer 124 has been applied, and graph C shows the transition of temperature change of the molten metal placed in a molten metal container to which the heat insulating paint layer 124 has not been applied. The molten metal container to which the heat insulating paint layer 124 has been applied, as in the example of Figure 4, can improve the heat insulating effect and minimize heat loss, thereby reducing the temperature drop of the molten metal compared to conventional methods.

[0031] Figure 5 shows the thermal insulation effect of the insulating board layer 123 compared with a conventional method. In Figure 5, graph D shows the transition of temperature change of the molten metal placed in a molten metal container with the insulating board layer 123 applied, and graph E shows the transition of temperature change of the molten metal placed in a molten metal container without the insulating board layer 123 applied. As such, the molten metal container with the insulating board layer 123 applied can also improve the thermal insulation effect and minimize heat loss, thereby reducing the temperature drop of the molten metal compared to conventional methods.

[0032] As described above, the molten metal container 100 of the first embodiment includes the insulating board layer 123 and the insulating paint layer 124 in addition to the refractory layer 122, thereby significantly improving the insulating effect compared to conventional methods and thereby minimizing heat loss from the molten metal during transportation and handling. Furthermore, compared to conventional methods that increase the thickness of the refractory layer, good insulating effect can be achieved without significantly increasing the volume or weight of the container.

[0033] FIG. 6 is a cross-sectional view showing a main part of a molten metal container 200 according to a second embodiment of the present invention.

[0034] The molten metal container 200 of the second embodiment further includes an inner skin layer 226 and a plurality of binding devices 227. Specifically, the second embodiment includes an outer skin layer 221, an insulating board layer 223 laminated on the inner surface of the outer skin layer 221, an inner skin layer 226 laminated on the inner surface of the insulating board layer 223, a refractory layer 222 laminated on the inner surface of the inner skin layer 226 and forming a molten metal storage space 210, and a heat insulating paint layer 224 applied to at least one of the outer surface of the outer skin layer 221, the inner surface of the outer skin layer 221, the outer surface of the inner skin layer 226, and the inner surface of the inner skin layer 226.

[0035] In the second embodiment, the outer iron skin layer 221, the insulating board layer 223, and the refractory layer 222 can be configured in the same manner as in the first embodiment, and the insulating paint layer 224 can also be provided with the same composition, although the application position is different.

[0036] When manufacturing the molten metal container 200 of the second embodiment, the outer iron skin layer 221, the heat insulating board layer 223, the inner iron skin layer 226, and the refractory layer 222 may be laminated in this order. Of course, the heat insulating paint layer 224 applied to the surfaces of the outer iron skin layer 221 and the inner iron skin layer 226 may be applied in advance before assembling them.

[0037] FIG. 6 illustrates an example in which the heat insulating paint layer 224 is applied to the outer surface of the outer iron skin layer 221 and the inner surface of the inner iron skin layer 226, but the heat insulating paint layer 224 is not limited to this. Depending on the required level of insulation, the heat insulating paint layer 224 may be selectively applied to at least one of the outer surface of the outer iron skin layer 221, the inner surface of the outer iron skin layer 221, the outer surface of the inner iron skin layer 226, and the inner surface of the inner iron skin layer 226, or may be applied to all surfaces of the outer iron skin layer 221 and the inner iron skin layer 226.

[0038] The multiple binding devices 227 may connect the inner skin layer 226 and the outer skin layer 221 at positions spaced apart from each other, thereby enhancing the rigidity of the molten metal container 200. As shown in Fig. 6, the multiple binding devices 227 may include multiple fastening bolts 228 that penetrate the insulation board layer 223 to bind the inner skin layer 226 and the outer skin layer 221 together, thereby tightly attaching the inner skin layer 226 and the outer skin layer 221 to the insulation board layer 223.

[0039] Here, the fastening bolt 228 is used as an example of the fastening device 227, but the type of the fastening device 227 is not limited thereto. The fastening device 227 may be a type in which a separate metal structure is positioned between the inner skin layer 226 and the outer skin layer 221 and the metal structure is welded to the inner skin layer 226 and the outer skin layer 221.

[0040] The molten metal container 200 of the second embodiment further includes an inner iron skin layer 226 and a number of binding devices 227, and an insulating paint layer 224 is provided not only on the outer iron skin layer 221 but also on the inner iron skin layer 226, thereby further increasing the rigidity of the molten metal container 200 compared to the first embodiment and further improving the insulating effect. [Explanation of symbols]

[0041] 100 molten metal container 101 Bottom 102 Side wall 103 Upper opening 105 Cover 110 Molten metal storage space 121 Outer iron skin 122 Refractory layer 123 Insulation Board Layer 124 Heat-insulating paint layer 200 molten metal container 221 Outer iron skin 222 Refractory layer 223 Insulation Board Layer 224 Heat-insulating paint layer 226 Internal iron skin layer 227 Binding device 228 Fastening bolt 210 Molten metal storage space

Claims

1. outer iron skin, a refractory layer laminated inside the outer iron shell layer and forming a space for accommodating molten metal; an insulating board layer interposed between the refractory layer and the outer iron skin layer; and a heat insulating paint layer applied to at least one of the outer surface and the inner surface of the outer iron skin layer; The heat insulating paint layer comprises a ceramic binder and a large number of hollow particles.

2. outer iron skin, an insulation board layer laminated on the inner surface of the outer iron skin layer; an inner steel skin layer laminated on the inner surface of the insulation board layer; a refractory layer laminated on the inner surface of the inner iron shell layer and forming a space for accommodating molten metal; and a heat insulating paint layer applied to at least one of an outer surface of the outer iron skin layer, an inner surface of the outer iron skin layer, an outer surface of the inner iron skin layer, and an inner surface of the inner iron skin layer; The heat insulating paint layer comprises a ceramic binder and a large number of hollow particles.

3. The heat insulating board layer is made of magnesium oxide (MgO) and silicon dioxide (SiO ２ 3. The container for melting metal according to claim 1, further comprising a component.

4. 3. The molten metal container according to claim 1, wherein the ceramic binder contains at least one element selected from the group consisting of silicon (Si), aluminum (Al), titanium (Ti), zirconium (Zr), calcium (Ca), magnesium (Mg), yttrium (Y), and cerium (Ce).

5. The numerous hollow particles are made of silicon dioxide (SiO ２ ), aluminum oxide (Al ２ O ３ 3. The molten metal container according to claim 1, further comprising at least one of particles of magnesium oxide (MgO).

6. 3. The molten metal container according to claim 2, further comprising a plurality of binding devices for connecting and binding the inner iron shell layer and the outer iron shell layer.

7. 7. The molten metal container according to claim 6, wherein the plurality of fastening devices include a plurality of fastening bolts that penetrate the insulation board layer to fasten the inner iron skin layer and the outer iron skin layer together, thereby tightly adhering the inner iron skin layer and the outer iron skin layer to the insulation board layer.

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