JP5639154B2 - Processing ladle - Google Patents

Abstract

A treatment ladle comprising a ladle shell containing a generally tubular refractory ladle liner, said ladle being pivotable between a horizontal position and a vertical position, said ladle liner having a first end and a second end with a continuous sidewall therebetween, an interior space being defined between said first and second ends and the continuous sidewall, said ladle liner additionally comprising a pocket for holding a treatment agent, said pocket being located adjacent the first end and in fluid communication with the interior space and located closer to the top than the bottom of the interior space when the ladle is in its horizontal position and closer to the bottom than the top of the interior space when the ladle is in its vertical position, and a spout for receiving and pouring molten metal located closer to the top than the bottom of the interior space when the ladle is in its horizontal and vertical positions, wherein in the horizontal position, a lower volume of the interior space defined below a plane midway between the top and bottom of the interior space and between the first end and a vertical plane intermediate the first and second ends is greater than an upper volume of the interior space defined above the midway plane and between the first end and said vertical plane. The treatment ladle is designed for the treatment of molten metal with vaporisable additives, in particular in the preparation of ductile iron. The invention also relates to a method of treating molten metal employing the ladle.

Description

  The present invention relates to a ladle for treating molten metal with a vaporizable additive, and more particularly to a ladle for treating iron with magnesium (Mg) to form ductile iron.

Ductile iron, also known as spheroidal graphite (s.g.) iron or nodular iron, is produced by treating liquid iron with a so-called nodularizer (or nodulizer) prior to casting. Nodularizers promote the precipitation of graphite in the form of dispersed lumps. In practice, the nodularizer usually contains magnesium as pure magnesium or as an alloy that may contain rare earth metals, such as magnesium-ferrosilicon (MgFeSi alloy) or nickel-magnesium (NiMg alloy). In a typical process, magnesium is added to liquid iron to a residual magnesium content of about 0.04%, and the iron is inoculated and cast. Adding magnesium to iron is difficult because magnesium boils at a relatively low temperature (1090 ° C.), resulting in vigorous stirring of liquid iron and a large loss of magnesium in gaseous form.
Various methods have been developed for preparing ductile iron, including:

  The sandwich ladle-treated alloy is housed in a recess at the bottom of the ladle and covered with steel scrap. The ladle may be covered with a tundish lid, for example. Iron is then poured into the ladle and the reaction with the treated alloy is slowed by a steel scrap barrier. This method is simple and widely used, but the Mg recovery rate is inconsistent. Furthermore, more nodularizers need to be used to successfully achieve the required processing level.

  The plunger-treated alloy is pushed into the ladle using a heat resistant plunger bell. This method is only practical for large quantities of metal.

  A converter-nodularizer is placed in the pocket at the bottom of the cylindrical ladle. The ladle is filled with liquid iron during horizontal placement, sealed, and rotated to a vertical position so that magnesium sinks under the iron.

  Core wire processing—Wires containing a nodularizer (eg, MgFeSi alloy) are mechanically fed into the iron using a dedicated station.

  In-mold processing—a nodularizer (eg, MgFeSi alloy) is placed in a chamber shaped into an operating system such that iron is continuously processed as it flows over the alloy.

One object of the present invention is to provide a ladle for treating metal with a vaporizable additive.
Another object of the present invention is to provide a method for treating molten metal with a vaporizable additive.

According to a first aspect of the present invention, there is provided a treatment ladle that includes a ladle shell containing a generally cylindrical heat-resistant ladle lining and is rotatable between a horizontal position and a vertical position. The pan lining has a first end and a second end having a continuous side wall therebetween, and an internal space is defined between the first end, the second end and the continuous side wall, and the ladle lining is And a pocket for holding the processing agent, located adjacent to the first end and in fluid communication with the interior space, closer to the top than the bottom of the interior space when the ladle is in a horizontal position. A pocket located closer to the bottom than the top of the internal space when the ladle is in a vertical position, and an inlet / outlet for receiving and pouring molten metal, the ladle being in a horizontal position And when it is in a vertical position, it includes an inlet / outlet located closer to the top than the bottom of the interior space. ,
In a horizontal position, the lower volume of the inner space defined below the intermediate plane between the top and bottom of the inner space and between the first end and the vertical plane intermediate the first end and the second end is , Larger than the intermediate plane and larger than the upper volume of the internal space defined between the first end and the vertical plane.

  From the above, it will be understood that in the vertical position, the first end of the ladle lining constitutes the lowermost part of the internal space.

  In use, the treatment agent is placed in the pocket and the ladle is filled with molten metal while in a horizontal position. Usually, the ladle is half filled so that the molten metal is filled to a height corresponding to the intermediate plane. The ladle is then rotated 90 ° to a vertical position so that the metal flows into the pocket containing the treatment agent. The treatment agent vaporizes in contact with the molten metal and bubbles to pass through the metal head above the pocket. The ladle is then rotated again so that the treated molten metal is discharged through the inlet / outlet. In a particular embodiment, the ladle is rotated more than 90 ° from a horizontal position and through a vertical position it reaches a third position (discharge position) where the treated molten metal is discharged.

  The ladle of the present invention is useful because it minimizes the surface area of the metal that is exposed to air when the ladle is in a horizontal position. A reduction in surface area leads to a reduction in heat loss from the metal. As heat loss decreases, the metal can be poured into the ladle at lower temperatures, thereby reducing wear of the heat resistant lining and other casting equipment. Lowering the temperature poured into the ladle also works to reduce the expansion of the magnesium vapor, which reduces the intensity of the reaction (with magnesium and hot metal). This improves the recovery of magnesium as more magnesium vapor is efficiently retained in the liquid iron, and the lower reaction intensity means less contact between the metal and the cooler atmosphere Therefore, it is thought that the heat loss after processing is reduced.

  Another advantage of the ladle of the present invention is that it maximizes the metal head above the treating agent when the ladle is in a vertical position. The increase in the metal head leads to a reduced reaction intensity between the metal and the treatment agent, and in the case of a magnesium-containing treatment agent, the recovery of magnesium is improved and more consistent.

  The advantage of the present invention is that the shape of the ladle lining, especially the portion of the ladle lining that contacts the molten metal when the ladle is filled (horizontal position) and when the metal is treated (vertical position) It will be understood that this is obtained by the shape of The vertical plane (intermediate between the first end and the second end when the ladle is in a horizontal position) is selected to evaluate the shape of the ladle lining. The vertical plane should be chosen to represent the general cross section of the ladle lining. If the ladle lining has a regular shape such that the cross-section of the continuous side wall is consistent over its entire length, the vertical plane is chosen at any point between the first end and the second end Good. For convenience, the vertical plane is equidistant from the first and second ends of the lining when the ladle is in a horizontal position.

  In certain embodiments, the pocket extends from the first end of the ladle lining and leaves the interior space (ie, extends below the first end when the ladle is in a vertical position). This leads to a further increase in the metal head over the treating agent, as the molten metal can fill the pockets when the ladle is in a vertical position. As described above, the increase in the metal head leads to a decrease in the intensity of the reaction between the metal and the treatment agent, and in the case of a magnesium-containing treatment agent, the recovery of magnesium is improved and becomes more consistent. In embodiments where the pocket extends from the first end, the length of the pocket may be 50-1200 mm, 200-1000 mm, or 400-600 mm.

  In an alternative embodiment, the pocket is located in the interior space. In any case, the pocket must either be in fluid communication with the interior space or it can be in fluid communication with the interior space upon contact with the metal. For example, the pocket may be defined by a mesh or grid that is small enough to hold the treatment agent and yet has openings that allow the passage of molten metal, or access to the contents of the pocket by melting. May be made of a material (such as a metal) that provides It will be appreciated that the volume of the pocket is generally small compared to the volume of the interior space. The shape of the pocket is not particularly limited, but for convenience, the pocket is lengthened to ensure retention of the treatment agent. The pocket may have a circular or triangular cross section.

  The ratio of the lower volume to the upper volume may be at least 1.5: 1, at least 2: 1, or at least 3: 1.

  The height of the internal space when the ladle is in a horizontal posture (the distance between the top and bottom of the internal space, defined by the inside of the continuous side wall) is 200 mm to 1500 mm, 400 mm to 1000 mm, or 600 mm to 800 mm may be sufficient.

  The height of the internal space when the ladle is in a vertical posture (the distance between the top and bottom of the internal space) may be 400 mm to 3000 mm, 800 mm to 2000 mm, or 1000 mm to 1500 mm.

  The ratio of the height of the interior space when the ladle is in a vertical position to the height of the interior space when the ladle is in a horizontal position is at least 1: 1, at least 2: 1, at least 3: 1, or at least 5: 1 may be sufficient. The ratio of the height of the internal space when the ladle is in a vertical posture to the height of the internal space when the ladle is in a horizontal posture may be 6: 1 or less, 4: 1 or less, or 3: 1 or less. .

  In embodiments where the pocket extends from the first end and leaves the interior space, the ratio of the height of the interior space when the ladle is in a vertical position to the length of the pocket is at least 1.5: 1, at least 2: 1, at least 2.5: 1, or at least 3: 1.

  The continuous side walls have an inner surface and an outer surface that may be the same or different in shape. For convenience, the continuous side walls have a uniform thickness and the inner and outer surfaces have the same shape. It will be understood that it is the inner surface of the continuous side wall that defines the shape of the interior space, and thus a reference to a cross section of the continuous side wall is a reference to a cross section of the inner surface of the continuous side wall.

  The continuous side wall may be defined by three or more walls such that the cross section of the continuous side wall is substantially polygonal. In an embodiment where the continuous side walls are defined by three walls, the cross section of the continuous side walls is substantially triangular. In an embodiment where the continuous side walls are defined by three walls of equal length, the cross section of the continuous side walls has an equilateral triangular shape. In any embodiment where the cross section is based on a polygon, the corners may be rounded / rounded and / or the sides may be bent outwards. For convenience, the cross section of the sidewall is measured in a vertical plane intermediate the first end and the second end.

  In an embodiment where the continuous side walls are defined by three walls so that the cross-section of the continuous side walls is substantially triangular, the height of the interior space when the ladle is in a vertical position relative to the length of the side walls. The ratio may be at least 1: 1, at least 1.5: 1, or at least 2: 1.

  In an embodiment where the continuous sidewalls are defined by three walls so that the continuous sidewall cross section is substantially triangular, the triangular cross section is the inscribed circle, ie, the largest that can be included in the triangle. Yen. In this case, the ratio of the height of the internal space when the ladle is in a vertical position to the radius of a circle inscribed in the cross section of the triangle is at least 1.5: 1, at least 2: 1, at least 2.5: 1, Or at least 3: 1.

  The ladle includes an injection / discharge portion for initially receiving the molten metal and later discharging the processed molten metal. This is particularly beneficial because the metal can be poured directly from the ladle into the mold and does not require a recuperation process. This has the dual benefit of reducing temperature loss and improving casting productivity by eliminating one step in the casting process.

  Suitable refractory materials include those described in EP 0 675 862 B1, in particular KALTEK®, which is a refractory lining made from silica, alumina and magnesite and bonded with an organic material such as a phenolic resin. ) Is included. In certain embodiments, the continuous sidewall is a unitary structure.

  To rotate the ladle, the ladle may be mounted on a crane or forklift or other machine.

  The ladle shell may be a conventional cylindrical shell or a modified shell adapted to the shape of the ladle lining. When a conventional cylindrical shell is adopted, it is necessary that the inner surface and the outer surface of the continuous side wall have different shapes, that is, the heat resistant lining does not have a uniform thickness. When a non-cylindrical shell is employed, the inner and outer surfaces of the continuous sidewall can have the same shape. For example, if the ladle lining includes a sidewall having a triangular cross-section, the shell may also have a triangular cross-section, i.e., a triangular prism.

  In certain embodiments, the ladle shell and ladle lining have substantially the same shape. This has the advantage that the amount of heat-resistant material used can be minimized. Alternatively, the ladle may include a conventional cylindrical ladle shell. This is convenient when reusing a conventional cylindrical shell. The efficiency of the ladle liner will at least partially offset the cost of the additional refractory material required to fit the ladle liner in the shell.

  According to the second aspect of the present invention, the ladle on the first side is loaded by placing the treatment agent in the pocket, and the molten metal is poured to a height below the pocket while the ladle is in a horizontal position. A method for treating molten metal is provided that includes filling the ladle and rotating the ladle to a vertical position so that the molten metal flows to the treating agent in the pocket.

  In certain embodiments, the method includes rotating the ladle more than 90 ° from a horizontal position, through a vertical position, to a discharge position where molten metal is discharged from the pouring and discharging section after processing. . In a further embodiment, the method includes rotating the ladle about 180 ° from a horizontal position to a discharged position in which the treated metal is discharged through a vertical position.

  In certain embodiments, the ladle is filled to a height corresponding to a plane intermediate between the top and bottom of the interior space when in a horizontal position.

  The method of the invention is particularly suitable for the preparation of ductile iron, where the treating agent is a nodularizer and the molten metal is iron.

  In one embodiment, the treating agent is a magnesium containing nodularizer. Suitable nodularizers include pure magnesium, magnesium-ferrosilicon alloys (MgFeSi alloys), nickel-magnesium alloys and magnesium-iron briquettes.

  The ladle and method of the present invention may be used for the production of both ductile (spherical graphite) iron and vermicula (compact graphite) iron.

  The method of the invention may include inoculation of molten metal after reaction with a treatment agent (eg, a nodularizer). Inoculum is an alloy that is added in small amounts to induce eutectic graphite nucleation. Suitable inoculums include those based on ferrosilicon and calcium silicide.

The method of the present invention may include initialization of the molten metal prior to reaction with the treating agent. The initializing agent is believed to deactivate the oxygen activity of the molten metal so that subsequent processing is better. Suitable initializing agents include those disclosed in International Publication No. WO2008 / 012492.
Embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings.

It is a perspective view of the ladle according to the embodiment of the present invention. It is a perspective view at the time of the assembly of the ladle shown to FIG. 1A. It is sectional drawing at the time of the assembly of the ladle shown to FIG. 1A. It is sectional drawing of the shaping | molding tool used in the assembly of the ladle shown to FIG. 1A. It is sectional drawing of the shaping | molding tool used in the assembly of the ladle shown to FIG. 1A. It is sectional drawing of the ladle shown to FIG. 1A. It is the schematic of the ladle shown to FIG. 1A. It is the schematic of the ladle shown to FIG. 1A. It is a figure which shows the ladle according to embodiment of this invention. It is a figure which shows the ladle according to embodiment of this invention. It is a figure which shows the ladle according to embodiment of this invention. It is a figure which shows the conventional ladle for a comparison. It is a figure which shows the conventional ladle for a comparison. It is a figure which shows the simulation using MAGMASOFT (trademark) software. It is a figure which shows the simulation using MAGMASOFT (trademark) software. It is a figure which shows the simulation using MAGMASOFT (trademark) software. It is a figure which shows the simulation using MAGMASOFT (trademark) software.

  FIG. 1A shows a ladle 10 according to an embodiment of the present invention. The ladle 10 includes a generally cylindrical steel shell 12 and a generally cylindrical heat resistant lining 14 (partially visible) within the shell 12. The ladle 10 has an opening 16 at the upper end and a protrusion 18 at the lower end. The shape of the shell 12 is complementary to the outer shape of the heat-resistant lining 14, and the protrusion 18 corresponds to the shape of a pocket (not visible) for holding the treatment agent. The ladle also includes a lid 20 that can be closed, the inner surface of which defines the second end of the heat resistant liner 14. The shell 12 and the heat-resistant lining 14 extend toward the upper end and form an injection / discharge portion 17 adjacent to the opening 16. The ladle 10 is shown in its vertical position, with the pouring and discharging section located at the top of the ladle and the pocket located at the bottom of the ladle. In this arrangement, the treatment agent can be easily loaded into the pocket through the opening 16.

  The ladle 10 consists of two parts, as shown in FIGS. 1B and 1C. The main body 10a of the ladle is manufactured by disposing the molding tool 22a in the shell 12 and filling the gap between the shell 12 and the molding tool 22a with a heat-resistant material (KALTEK (registered trademark)). When the heat resistant material is cured, the forming tool 22a is removed. Similarly, the ladle projection 10b is produced by placing another molding tool 22b in the shell corresponding to the projection 18 and filling the gap between the molding tool 22b and the projection 18 with a heat resistant material. ing. It will be understood that the outer surfaces of the forming tools 22a, 22b correspond to the internal shape of the heat resistant ladle lining 14. The two parts 10a, 10b are then attached to each other.

  FIG. 1C shows a cross section of the ladle 10 without the lid 20 before the forming tools 22a, 22b are removed. The heat-resistant lining 14 has a continuous side wall 24 and a lower end (first end) 26, and the lid 20 is not attached, so that the upper end of the ladle is entirely open. The uppermost part of the continuous side wall defines the part (second end 28) to which the lid 20 is attached. The ladle lining 14 includes a pocket 30 for holding the treatment agent. Pocket 30 extends away from the first end. This provides the advantage that a larger head of metal results above the treating agent. It should be noted that the wall of the pocket 30 is thicker than the continuous side wall 24. Thicker walls provide additional insulation for treatment agent vaporization.

  Let x be the height of the internal space when the ladle is in a vertical position. Let y be the height of the internal space when the ladle is rotated and is in a horizontal posture. Let the depth of the pocket be z. In the present embodiment, the approximate values of x, y, and z are 1380 mm, 640 mm, and 480 mm, respectively. Thus, the x: y ratio is about 2.2: 1 and the x: z ratio is about 2.9: 1.

  FIG. 1D shows a cross section of the forming tool 22a. The outer surface of the forming tool 22a defines the inner surface of the continuous side wall 24 and thus defines the cross section of the interior space. The cross section of the forming tool 22a is based on an equilateral triangle with its vertices rounded and sides bent outward.

  FIG. 1E shows a cross section of the forming tool 22b. The outer surface of the forming tool 22 b defines the wall of the pocket 30. In the present embodiment, the cross section of the forming tool 22b is related to the cross section of the forming tool 22a (shown by a broken line). The cross section of the forming tool 22b is also approximately triangular. It will be appreciated that the pocket 30 may have another cross section, such as a circular cross section. However, the triangular cross-section is considered advantageous because it assists in retaining the treatment agent in the pocket 30 when the ladle is rotated from a vertical position to a horizontal position.

  FIG. 1F shows a cross section of the ladle body 10 a including the shell 12 and the continuous heat resistant side wall 24. The side wall 24 is based on an equilateral triangle (indicated by a broken line) in which each vertex contacts the side wall 24. In the present embodiment, the length of each side of the triangle is about 740 mm, and the height of the internal space when the ladle is in a vertical posture with respect to the length of the side wall portion (indicated by symbol x in FIG. 1C). The ratio is about 1.8: 1. The triangle includes an inscribed circle (also indicated by a dashed line). In the present embodiment, the inscribed circle has a diameter of about 427 mm, and the height of the internal space when the ladle is in a vertical posture with respect to the length of the diameter of the circle (indicated by reference sign x in FIG. 1C). The ratio of (shown) is about 3.2: 1.

  The ratio of the ladle shown in FIGS. 1A-1F combines good heat retention with efficient treatment and is considered particularly beneficial for the treatment of metals with treatment agents.

  2A and 2B are schematic views of the ladle 10 shown in FIG. 1A in a horizontal posture. The ladle 10 includes a first end 26, a second end 28, and a continuous side wall 24 as described above. In this horizontal arrangement, the upper part of the side wall defines the top 40 of the inner space and the lower part of the side wall defines the bottom 42 of the inner space. An intermediate vertical plane 44 between the first end and the second end is shown. This vertical plane is selected closer to the first end 26 than to the second end 28. This is because the continuous side wall 24 corresponds to a position having a regular shape. An intermediate horizontal plane 46 between the top 40 and bottom 42 of the interior space is shown. A volume (lower volume) of the internal space defined between the bottom 42 of the internal space, the first end 26, the intermediate plane 46, and the vertical plane 44 is indicated by a symbol I. The volume (upper volume) of the internal space defined between the apex 40 of the internal space, the first end 26, the intermediate plane 46, and the vertical plane 44 is indicated by symbol II. Looking at FIG. 2A, volume I and volume II appear to be equal, but as is apparent from FIG. 2B, volume I is larger than volume II due to the cross-sectional shape of the continuous sidewall 24.

  The triangular prism shape of the ladle according to the embodiment of the present invention has a heat loss from the metal when in a horizontal posture and a treatment agent when in a vertical posture (second posture) as compared with a cylindrical ladle. This is advantageous in terms of an increase in the upper metal head. As is apparent from the schematic of FIG. 2B, when the ladle is half filled, less metal will be exposed to air than the control cylindrical ladle. Similarly, when the ladle is rotated from a horizontal position to a vertical position, the metal height will be greater than the control cylindrical ladle.

Example 1 and Comparative Example 1: Simulation In order to fairly assess the rate of heat loss for a ladle according to an embodiment of the present invention (Example 1), we have two ladles, Example 1 (According to an embodiment of the present invention) and a comparative ladle (Comparative Example 1) were designed and simulated using the MAGMASOFT simulation tool. MAGMASOFT is the primary simulation tool for modeling mold filling and casting solidification provided by MAGMA Giesseritetechnology GmbH. This is commonly used in foundries to avoid expensive and time-consuming casting tests.

  The ladle of Example 1 is shown in FIG. 3A (vertical posture) and shown in FIGS. 3B and 3C (horizontal posture). The interior space has a substantially triangular cross section. Comparative Example 1 is shown in FIG. 4A (vertical posture), and shown in FIGS. 4B and 4C (horizontal posture). The internal space has a circular cross section.

  In each figure, a dotted line is shown to represent the height of the molten metal when the ladle is filled to the working capacity. A comparison of the characteristics of the two ladles is shown in Table 1 below.

  As can be seen, both ladles hold the same amount of metal but are filled to different heights due to their different shapes. In the horizontal position, the metal is filled to the same height in both cases, but when the ladle is rotated to a vertical position, the height of the metal is higher than that in the first comparative example. Much larger in The higher metal above the vaporizable treatment agent means that the vaporized treatment agent must move through more metal, and therefore more likely to stay within the molten metal, resulting in better recovery. , That means.

  Furthermore, the total surface area of the metal (in contact with the air or ladle wall) and the top surface area of the metal (in contact with air) are smaller in Example 1 than in Comparative Example 1. This corresponds to the geometric coefficient being larger in Example 1 than in Comparative Example 1. Therefore, the molten metal in the ladle of Example 1 will cool more slowly than the molten metal in the ladle of Comparative Example 1.

  In the simulation, the ladle was modeled as containing a molten steel and having a heat resistant lining having the same thermal insulation properties as KALTEK®. The model considered the boundary material above the metal as air. The simulation was performed at two different initial temperatures (1400 ° C. and 1580 ° C.) for the heat resistant lining. The results after 240 seconds are shown in FIGS. 5A to 5D. These simulation outputs are shaded isotherms of the metal, and the darkness of the shade is inversely proportional to the temperature of the liquid metal, i.e. the darker the shade, the colder the metal, the actual value is represented by the temperature key in the simulation Has been.

  5A and 5B show the surface temperature of the metal when the heat resistant lining has an initial temperature of 1400 ° C. for Example 1 and Comparative Example 1, respectively. The surface temperature of the metal is higher in the ladle of the present invention than in the comparative example, even though both ladles contain the same amount of metal and have the same initial temperature. This is indicated by the fact that the percentage of dark isotherm (shade) of metal is higher in FIG. 5B than in FIG. 5A. This is because the darker the shade, the colder the metal.

  5C and 5D show the surface temperature of the metal when the heat resistant lining has an initial temperature of 1580 ° C. for Example 1 and Comparative Example 1, respectively. Again, the surface temperature of the metal is higher in the ladle of the present invention than in the comparative example, as shown by the thinner shade in FIG. 5C compared to FIG. 5D. This represents that the ladle of the present invention allows the metal to maintain a higher temperature for a longer time.

Example 2 and Comparative Example 2-Preparation of Ductile Iron Ductile iron was prepared using a ladle according to an embodiment of the present invention (Example 2) and a standard tundish ladle (Comparative Example 2). In both cases, the molten iron was treated with a magnesium-ferrosilicon alloy (MgFeSi). Magnesium recovery after 4 and 9/10 minutes was measured. Magnesium recovery was calculated according to the following formula:
Mg recovery% = (0.76 × (S% in base metal−residual S%) + residual Mg%)
× 100 / Additional Mg%

Example 2
The ladle 10 shown to FIG. 1A was arrange | positioned in the vertical attitude | position which makes the pocket 18 the lowest point. 20.8 kg of magnesium-ferrosilicon alloy (5.38% Mg) was then loaded into the pocket using a long-necked funnel placed in the opening. After loading the treatment agent, the ladle was rotated 90 ° to a horizontal position. The ladle was then filled with 1600 kg of molten iron at a temperature of 1480 ° C. Next, the ladle was rotated back to the vertical posture so that the molten iron flowed into the pocket. A white flare was observed as the molten iron reacted with the magnesium alloy. The metal was poured out from the ladle by tilting the ladle and pouring out from the pouring / discharging part 17. The results are shown in Table 2 below.

Comparative Example 2
14.4 kg of magnesium-ferrosilicon alloy (5.38% Mg) is placed in the recess of a standard tundish ladle and 800 kg of molten iron (standard technique) at a temperature of 1500 ° C. is poured into the pan. I put it in. The results are shown in Table 2 below.

  Magnesium recovery is much higher in Example 2 than in Comparative Example 2. Thus, the ladle according to embodiments of the present invention appears to provide better recovery than the aiming tundish ladle.

Claims (12)

A treatment ladle (10) comprising a ladle shell (12) containing a generally cylindrical heat-resistant ladle lining (14) , which is rotatable between a horizontal position and a vertical position;
The ladle lining (14) has a first end (26) and a second end (28) with a continuous side wall (24) therebetween,
It said first end (26), the interior space between the second end (28) and said continuous side wall (24) is defined,
The continuous side wall (24) is cut by a plane (44) perpendicular to an axis parallel to the direction in which the continuous side wall (24) extends between the first end (26) and the second end (28). When the continuous side wall (24) has a cross section defined by three walls so that the cross-section of the continuous side wall (24) is consistently substantially triangular over the entire length of the continuous side wall (24);
When the ladle is in a horizontal position, one vertex of the substantially triangular shape in the cross-section of the continuous side wall (24) is the first of the interior space defined by the top of the continuous side wall (24). The interior space defined by the bottom of the continuous side wall (24), wherein the two remaining vertices of the substantially triangular shape in the cross-section of the continuous side wall (24) are located at the top of one (40) Located in the first bottom (42) of the
The ladle lining (14),
A pocket for holding a treatment agent (30), through the interior space in fluid communication with positioned adjacent said first end (26), of the interior space when the ladle is in the horizontal position The internal space located closer to the first top (40) of the internal space than the first bottom (42 ) and defined by the second end (28) when the ladle is in a vertical position pockets located close to the second bottom of the internal space than the second apex of being defined by said first end (26) (30), and,
A injection discharge unit for and pour for receiving molten metal (17), when in and vertical position when the ladle is in its horizontal position, the than the first and second bottom of the inner space injection and expelling portion positioned closer to the first and second top of the interior space (17) including,
A ladle characterized by that.   The ladle according to claim 1, wherein the pocket extends from the first end of the ladle lining and leaves the internal space. The ratio of the height of the interior space when the ladle to the height of the interior space when the ladle is in its horizontal position is in a vertical position is at least 2: 1, according to claim 1 or 2, characterized in that The ladle described in. The ratio of the height of the interior space when the ladle to the height of the interior space when the ladle is in its horizontal position is in a vertical posture, 6: 1 or less, according to claim 1 to 3, characterized in that The ladle according to any one of the above. The pocket extends from the first end of the ladle lining and leaves the inner space, and the ratio of the height of the inner space when the ladle is in a vertical position with respect to the length of the pocket is at least 2: 1 The ladle according to any one of claims 1 to 4 . Triangle vertices are rounded, and and, triangle sides are bent outwards, that ladle according to claim 1, wherein the. Wall at least one height ratio of the internal space when the ladle to the length is in a vertical position of at least 1.5 of a: 1, claim 1-6, characterized in that The ladle according to item 1. The ladle according to any one of claims 1 to 7 , wherein the continuous side wall has an integral structure. The ladle according to any one of claims 1 to 8 , wherein the ladle shell and the ladle lining have substantially the same shape. The ladle according to any one of claims 1 to 9 is loaded by disposing the treatment agent in the pocket, and the molten metal is taken up to a height below the pocket while the ladle is in a horizontal position. A method for processing molten metal comprising filling and rotating the ladle to a vertical position so that the molten metal flows into the processing agent in the pocket. The method according to claim 10 , wherein the ladle is rotated by more than 90 ° from a horizontal posture, and through a vertical posture, the molten metal is discharged from the pouring and discharging unit. The method according to claim 10 or 11 , wherein the treatment agent is a nodularizer.

Images