JP2004169082A - Facility and method for smelting molten cast iron for ductile casting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a smelting facility with which a series of operations in steps for smelting molten cast iron for a ductile casting from a raw molten metal stored in a holding furnace are performed by very few operators, when manufacturing a ductile casting. <P>SOLUTION: The smelting facility has the holding furnace 1 for storing the raw molten metal, a ladle 7 for receiving the raw molten metal, a graphite-spheroidizing device 8 for adding a graphite spheroidizing agent into the ladle, and a slag treatment device 11 for discharging slag from the ladle, wherein among the holding furnace, the graphite-spheroidizing device and the slag treatment device, a transporting carriage 4 having a ladle-transferring means 5, which runs by itself with the mounted ladle and transfers the mounted ladle on the device, and the ladle-carrying means 2, 3, 9, 10 and 14 for reciprocating the ladle between the transporting carriage 4 and the above described furnace 1, device 8 and device 11, and transferring the ladle to the transporting carriage are installed; and the ladle is transported from the holding furnace to the graphite-spheroidizing device and the slag treatment device 11 by the transporting carriage and the ladle-transporting means without being lifted. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a facility and a method for smelting molten cast iron for ductile casting, and in particular, a ladle containing molten cast iron was moved without being lifted by a crane or the like, and was melted in a melting furnace. The present invention relates to an apparatus and a method for producing molten cast iron for ductile casting from molten cast iron (referred to as “motoyu” in the present invention).
[0002]
[Prior art]
Ductile castings such as ductile iron pipes have the same tensile strength as steel materials, and mechanical test values such as elongation and toughness are more than ten times that of ordinary cast iron, and have excellent corrosion resistance equivalent to ordinary cast iron. Therefore, it is widely used in various piping materials and the like under severe environments such as underground pipes where these characteristics are required.
[0003]
This ductile casting is obtained by adding a graphite spheroidizing agent such as metallic Mg to a hot water melted by a cupola or an electric furnace using iron scrap as a main iron source material, and C: 3 to 4% by mass (hereinafter “%”). ), Melted iron for ductile casting containing Si: 2-3%, Mn: 0.2-0.5%, Mg: 0.01-0.06%, and centrifugal casting machine It is manufactured by casting using such casting equipment (for example, see Patent Document 1). In this case, in order to improve the yield of addition of the graphite spheroidizing agents such as metals Mg, Si, and rare earth metals, desulfurization treatment is applied to the original hot water as needed before the graphite spheroidizing agent is added. I have.
[0004]
When smelting the hot water melted in the melting furnace into molten cast iron for ductile casting, usually, the hot water melted in the melting furnace is once charged into a holding furnace, and then stored and retained in the holding furnace, and the temperature is lowered. After homogenizing the ingredients and components, a predetermined amount of hot water is charged into the ladle from the holding furnace, and a graphite spheroidizing agent is added in the ladle, or the hot water in the ladle is separated by hot water. Graphite spheroidizing treatment is performed by adding a graphite spheroidizing agent to hot water and then combining with the original hot water. Conventionally, a ladle containing the original hot water and the molten metal after the graphite spheroidizing treatment are performed. Is lifted by a crane, a hoist, or the like, and transported between a holding furnace and a graphite spheroidizing apparatus.
[0005]
[Patent Document 1]
JP-A-6-246415
[Problems to be solved by the invention]
Cranes and hoists are widely and commonly used as a means of transporting heavy objects in the steelmaking and metalworking industries. Further, since the transport route is in the air, there is an advantage that it is not necessary to provide a special transport route.
[0007]
However, when the ladle containing the molten metal is transported by a crane, no other manufacturing equipment is usually arranged immediately below the transport route in consideration of the emergency. Therefore, it is necessary to keep the places directly below the transport route and the places that are expected to be affected in the unlikely event that they are affected, in an empty state. It is hard to say.
[0008]
Further, when transporting using a crane or a hoist, an operator who operates the crane or the hoist is required, and at the same time, a slinging operator who checks the condition of the crane hook and the like is required on the ground. In this case, a crane with a high operating rate requires the operator to always be on the crane and operate the crane. The operator will wait for that period. At present, although the crane operation has been promoted to be unmanned, the work of transporting the ladle containing the molten metal by the crane has not been done yet from the viewpoint of preventing a serious accident.
[0009]
As described above, conventionally, when the molten cast iron for ductile casting is melted from the original hot water through the graphite spheroidizing apparatus from the holding furnace, the molten metal is transported by the transporting device having lifting means such as a crane, In addition to requiring a dedicated operator to operate the transport device, it also requires instructions and cues from the slinging operator every time the work is performed, which is not necessarily a task with high labor productivity, and the cost of manufacturing ductile castings Was one factor that raised
[0010]
The present invention has been made in view of the above circumstances, its purpose is, when manufacturing ductile castings such as ductile cast iron pipes, receiving the original hot water stored and retained in the holding furnace in a holding furnace, and then In the process of transporting to the graphite spheroidizing apparatus and melting it into molten cast iron for ductile casting, and further removing slag in the ladle as needed, the operation of the ladle An object of the present invention is to provide a smelting facility and a smelting method for molten cast iron for ductile casting, which can perform graphite spheroidizing treatment.
[0011]
[Means for Solving the Problems]
A melting equipment for molten cast iron for ductile casting according to a first aspect of the present invention for solving the above-mentioned problems receives a holding furnace for storing a hot water melted in a melting furnace, and receives the hot water stored in the holding furnace. A ladle and a graphite spheroidizing apparatus for adding a graphite spheroidizing agent to a hot water in a ladle, and a smelting equipment for molten cast iron for ductile casting, wherein the holding furnace and the graphite spheroidizing treatment are performed. Between the device, a carrier having a ladle moving means to move the loaded ladle while running with the ladle mounted on its own, and to move the ladle back and forth between the carrier And a ladle transfer means for moving the ladle, wherein the ladle is moved from the holding furnace to the graphite spheroidizing apparatus by the transfer cart and the ladle transfer means without being lifted. It is assumed that.
[0012]
The melting equipment for molten cast iron for ductile casting according to the second invention comprises: a holding furnace for storing the hot water melted in the melting furnace; a ladle for receiving the hot water stored in the holding furnace; Of molten cast iron for ductile casting, comprising: a graphite spheroidizing treatment device for adding a graphite spheroidizing agent to the original hot water; and a slag treatment device for discharging the slag in the ladle from the ladle after the graphite spheroidizing treatment. A smelting facility, wherein a ladle is mounted between the holding furnace, the graphite spheroidizing apparatus, and the waste disposal apparatus, the ladle is self-propelled, and the mounted ladle is moved thereon. A carrier carriage having a pan moving means, and a ladle carrier means for moving the ladle between the carrier and the carrier carriage are provided, and the ladle is transported without being lifted. The spheroidizing treatment equipment for graphite and the It is characterized in that is moved to Haikasu processor.
[0013]
In the smelting equipment for molten cast iron for ductile casting according to a third invention, in the first or second invention, the ladle moving means and the ladle transferring means are mounted on rollers by rotating the rollers. It is of a roller table type in which a ladle is moved.
[0014]
In the smelting equipment for molten cast iron for ductile casting according to a fourth invention, in any one of the first to third inventions, the transport trolley travels on one straight line, and the ladle transfer means includes a ladle transfer means. The moving direction of the pot is provided in a direction substantially perpendicular to the traveling direction of the carrier.
[0015]
According to a fifth aspect of the present invention, there is provided the smelting equipment for molten cast iron for ductile casting, according to any one of the first to fourth aspects, wherein the position of the carrier is detected by a laser sensor. It is.
[0016]
In the method for producing molten cast iron for ductile casting according to the sixth invention, a hot water stored in a holding furnace is received in a ladle, a graphite spheroidizing agent is added to the ladle, and then the ladle is heated. It is a method of melting molten iron for ductile casting by discharging slag in the ladle, and after receiving the hot water from the holding furnace, lifting the ladle for a period until the slag in the ladle is discharged The molten cast iron for ductile casting is melted from the original hot water by moving the hot melt.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 6 are diagrams showing an embodiment of the present invention, and FIG. 1 is a schematic plan view showing the entire configuration of a smelting facility for molten cast iron for ductile casting according to the present invention, FIG. 2 and FIG. 3 is an enlarged view of the carrier 5 shown in FIG. 1, FIG. 2 is a side view, FIG. 3 is a plan view, and FIGS. 4 and 5 are enlarged views of the roller table 9 shown in FIG. 4 is a side view, FIG. 5 is a plan view, and FIG. 6 is a schematic side view of the waste disposal apparatus 11 shown in FIG.
[0018]
As shown in FIG. 1, in the smelting equipment for molten cast iron for ductile casting in the present embodiment, a graphite spheroidizing treatment apparatus for adding a graphite spheroidizing agent such as Mg to a holding furnace 1 and a ladle 7. 8 and a waste disposal device 11 for discharging slag in the ladle 7 are arranged side by side in a horizontal direction, and a pair of rails 6, 6 extending substantially linearly along these devices. Are arranged on the rails 6, 6, and the carrier 4 traveling on the rails 6, 6 is arranged.
[0019]
Note that the holding furnace 1 is a container for temporarily storing a hot water (molten cast iron) melted in a melting furnace (not shown) such as a cupola or an electric furnace before being cast by a casting facility such as a centrifugal casting machine. This is a furnace whose inner wall is made of a refractory material and which can heat the contained hot water by low frequency induction or the like. The graphite spheroidizing treatment device 8 is a device for adding a graphite spheroidizing agent to the original hot water to spheroidize the graphite in the original hot water and for producing molten cast iron for ductile casting from the original hot water. Using pure Mg, Fe-Si-Mg alloy, Ni-Mg alloy, Cu-Mg alloy, rare earth metal, etc., as appropriate, such as pouring method, ladle addition method with lid, plunger method, pressure addition method, wire feeder method, etc. In the present embodiment, a method of adding an iron-coated Mg wire in which pure Mg is coated and the outside of which is coated with a steel plate to a hot water in a ladle 7 by a wire feeder method. Is used. Further, the waste disposal apparatus 11 is an apparatus that removes slag floating on the molten cast iron for ductile casting and improves the quality of the ductile casting to be cast. In the present embodiment, a ladle is used. A method is used in which the slag is discharged into the slag pot 12 at the slag discharge station 13 with the slag 7 being inclined.
[0020]
A roller table 2 and a roller table 3 are arranged between the holding furnace 1 and the rail 6 in a direction perpendicular to the traveling direction of the carrier 4 as a ladle transfer means for moving the ladle 7. Similarly, a roller table 9 and a roller table 10 are disposed between the graphite spheroidizing apparatus 8 and the rail 6, and a roller table 14 is disposed between the waste processing apparatus 11 and the rail 6. Are located. A roller table 5 is provided on the carrier 4 as a ladle moving means for moving the ladle 7 in a direction perpendicular to the traveling direction of the carrier 4 on the carrier 4.
[0021]
As shown in FIGS. 2 and 3, the roller table 5 is provided with a plurality of rollers 19 having a concave portion at the center portion rotatably held by bearings 22 attached to the transport trolley 4 and arranged in a vertical direction. The rollers 19 are arranged in two rows, and each roller 19 is rotatably installed via a reduction gear 24 and a transmission 24A by a roller drive motor 23 attached to the carrier 4. The ladle 7 is supported by the roller table 5 in a state where a pair of rails 25 arranged on the bottom surface of the ladle 7 are placed on the concave portion of the roller 19, and moves on the roller 19 by the rotation of the roller 19. ing. The roller table 5 is provided with a stopper (not shown) for fixing the ladle 7 so as not to move, and a plurality of limit switches (not shown) for detecting the position of the ladle 7. is set up.
[0022]
A carriage driving motor 21 is attached to the carrier 4, and the wheels 20 on the rails 6 are rotated by the operation of the carriage driving motor 21 to move the carrier 4. On an extension of the rail 6, a laser sensor 33 that transmits laser light toward the carrier 4 over the entire path of the carrier 4 and receives reflected laser light from the carrier 4 is installed. The location of the carriage 4 is constantly monitored by the laser sensor 33. By monitoring the location with the laser sensor 33, the location can be detected with high accuracy of ± 10 mm or less, and there is no need to perform origin compensation on the measurement principle. Even if the measurement is interrupted once due to some trouble, the position can be detected immediately after the return, which is extremely preferable as the position detecting means of the carrier 4. On the other hand, in the case of the limit switch, when some trouble occurs during the measurement and the measurement is temporarily interrupted, it is necessary to return to the origin once to compensate, and the measurement becomes complicated.
[0023]
The configuration of the roller tables 2, 3, 9, 10, and 14 will be described with reference to an example of the roller table 9 shown in FIGS. As shown in FIGS. 4 and 5, the roller table 9 is fixed to a foundation 32 by a gantry 27, and the configuration of the roller table 9 is substantially the same as the roller table 5 of the above-described transport trolley 4. That is, a plurality of rollers 19 having a concave central portion are rotatably held by bearings 22 and arranged in two rows in a vertical direction. Each roller 19 is decelerated by a roller drive motor 23. It is installed rotatably via the machine 24 and the transmitter 24A. The ladle 7 is supported with a pair of rails 25 provided on its bottom placed on the concave portion of the roller 19, and moves on the roller 19 as the roller 19 rotates. The roller table 9 is provided with a plurality of limit switches (not shown) for detecting the position of the ladle 7. As described above, the structure of the roller table 9 is substantially the same as the structure of the roller table 5 of the transport trolley 4 except that the ladle 7 is connected to the transport trolley 4 and the roller tables 2, 3, 9,. This is because the carrier and the roller tables 2, 3, 9, 10, and 14 have the same supporting method and moving method because they move back and forth between the transfer tables 10 and 14.
[0024]
The configuration of the roller tables 2, 3, 10 is substantially the same as the configuration of the roller table 9, but the roller table 2 has a load cell for measuring the mass of the ladle 7 and the mass of the molten metal in the ladle 7. (Not shown) is provided. The load cell may be installed at an appropriate position between the roller table 2 and the gantry, for example. The roller table 3 is provided with an elevating device (not shown) for elevating and lowering the roller table 3 itself. The elevating device comprises a roller table 2 for receiving the hot water from the holding furnace 1 and the height position of the carrier 4. Since the height positions are different, it is for adjusting the difference, and is not particularly required in the present invention. The lifting device may be a conventional device using an electric motor, a pressure cylinder, or the like. Roller table 10 is substantially identical to roller table 9. As described above, the roller tables 2, 3, and 10 are similar to the roller table 9, but the overrun prevention plate of the ladle 7 and the stopper for fixing the ladle 7 are installed at the target positions. Therefore, its position is different on each roller table.
[0025]
The configuration of the roller table 14 is also substantially the same as the above-described configuration for moving the ladle 7, but the roller table 14 is configured such that the roller table 14 itself can be tilted for waste treatment. I have. That is, as shown in FIG. 6, a base 28 is mounted on a base 32, a hydraulic cylinder 29 is mounted on the base 28, and a rod 29a of the hydraulic cylinder 29 is tilted on the base 28. It is connected to a tilting arm 30 rotatably mounted on a shaft 31. The roller table 14 is formed integrally with the tilting arm 30. Accordingly, by operating the hydraulic cylinder 29 to extend the rod 29a and tilt the tilting arm 30, as shown by a broken line in the drawing, The roller table 14 is tilted, and the ladle 7 fixed on the roller table 14 is tilted toward the slag pot 12.
[0026]
Further, as shown in FIG. 1, in the present embodiment, the ladle 7 subjected to the waste treatment by the waste treatment device 11 is transported to a separate building where casting facilities such as a centrifugal casting machine (not shown) are installed. Trolley 15 is installed for carrying out. A roller table 16 for moving the ladle 7 thereon is also provided on the ridge-side transfer carriage 15 similarly to the transfer carriage 4, and the configuration of the roller table 16 is based on the movement of the loaded ladle 7. The configuration is the same as that of the roller table 5 attached to the transport vehicle 4 except that the direction is the same as the traveling direction of the ridge-side transport vehicle 15. On the extension of the rail 17 on which the Munekoshi transport vehicle 15 travels, a laser beam is transmitted toward the Munekoshi transport vehicle 15 over the entire path of the Munekoshi transport vehicle 15, and the reflected laser from the Munekoshi transport vehicle 15 A laser sensor 34 for receiving light is installed, and the position of the ridge-side transfer carriage 15 is constantly monitored by the laser sensor 34. Note that, in the present invention, the ridge-over transfer cart 15 is not always necessary, and the ladle 7 may be transferred to a casting facility such as a centrifugal caster using a crane or the like after the waste treatment.
[0027]
A method of melting molten cast iron for ductile casting using the melting equipment for molten cast iron for ductile casting having such a configuration will be described below.
[0028]
Using an iron source such as iron scrap and a carbonaceous material such as coke as raw materials, the original hot water (molten cast iron) is melted in a melting furnace such as a cupola or an electric furnace and, if necessary, desulfurized. Hot water is temporarily stored in the holding furnace 1. Usually, a runner (not shown) through which the hot water passes is provided between the melting furnace and the holding furnace 1, and the hot water is supplied from the melting furnace to the holding furnace 1 continuously or intermittently. Is done. Usually, a desulfurization device is installed in the runner.
[0029]
The empty ladle 7 is kept on standby on the roller table 2, the holding furnace 1 is tilted, and the original hot water is poured into the ladle 7 through the pouring gutter 18. The amount of hot water received is monitored by a load cell installed on the roller table 2, and when a predetermined amount of hot water is poured, the holding furnace 1 is raised horizontally and the pouring from the holding furnace 1 is stopped. In this state, a signal of the completion of hot water reception is input to a general control panel (not shown) that monitors the operation of the transport trolley and the roller table. Thereafter, the ladle 7 is configured to be automatically moved by the integrated control panel until the ladle 7 is mounted on the roller table 14 installed in the waste disposal apparatus 11.
[0030]
When a hot water receiving completion signal is input, the roller table 2 and the roller table 3 automatically operate, and the ladle 7 containing the original hot water is transported from the roller table 2 to the roller table 3 and temporarily stopped at the roller table 3. Then, it rises to the height position of the carrier 4. During this time, the transport trolley 4 is automatically moved to a predetermined position on the front surface of the roller table 3, and the ladle 7 raised to the height position of the transport trolley 4 is automatically placed on the transport trolley 4 from the roller table 3. Moved to
[0031]
When the ladle 7 is mounted on the transport trolley 4 and fixed at a predetermined position on the transport trolley 4, the transport trolley 4 automatically travels to the front position of the roller table 9 and stops at the predetermined position. When the carriage 4 stops at a predetermined position, the roller table 5, the roller table 9 and the roller table 10 of the carriage 4 automatically operate, the ladle 7 is transported from the roller table 5 to the roller table 10, and It is fixed at a predetermined position on the table 10. When the ladle 7 is fixed at a predetermined position on the roller table 10, the iron-coated Mg wire is supplied to the original hot water in the ladle 7 by a wire feeder device installed as a graphite spheroidizing device 8, and the original hot water is ductile. It is produced in molten cast iron for casting. The supply of the iron-coated Mg wire is automatically performed by the integrated control panel based on the mass of the hot water, the reference amount of Mg addition, the yield, and the like, which are input in advance to the integrated control panel.
[0032]
When a predetermined amount of the iron-coated Mg wire is added and the graphite spheroidizing treatment with Mg is completed, the roller table 9, the roller table 10, and the roller table 5 of the carrier 4 are automatically operated to melt the ductile casting. The ladle 7 containing the cast iron is transported again onto the transport trolley 4. When the ladle 7 is fixed at a predetermined position on the transport trolley 4, the transport trolley 4 automatically travels to the front position of the roller table 14 and stops at the predetermined position. When the carriage 4 stops at a predetermined position, the roller table 5 and the roller table 14 automatically operate, and the ladle 7 is transferred from the roller table 5 to the roller table 14 and fixed at a predetermined position on the roller table 14. Is done.
[0033]
After confirming that the ladle 7 is fixed at a predetermined position on the roller table 14, the hydraulic cylinder 29 is operated to tilt the ladle 7 and hold it at a predetermined inclination angle. In this state, the slag in the ladle 7 is discharged into the slag pot 12 using the slag jig at the slag station 13. When the waste disposal operation is completed, the hydraulic cylinder 29 is actuated to return the ladle 7 to the horizontal state, and the ladle 7 is moved onto the ridge-carrying carriage 15 that has been waiting at the front position of the roller table 14 in advance. .
[0034]
When the ladle 7 is moved to the Munekoshi carrier trolley 15 and is fixed at a predetermined position on the Munekoshi carrier trolley 15, the ladle 7 is caused to travel and the casting equipment such as a centrifugal casting machine is installed. Transported to another building. When it is necessary to lift the ladle 7 with a crane or the like at the time of casting in a casting facility, the trunnion 26 installed on the ladle 7 is directly hooked on a hook of a crane or the like, or a hanging tool is attached to the trunnion 26 and attached. It can be lifted by hanging a hanging tool on a hook or the like. The empty ladle 7 after casting is conveyed in the order of the trolley 15, the trolley 4, the roller table 3, and the roller table 2, and stands by immediately below the holding furnace 1.
[0035]
As described above, by using the smelting equipment for molten cast iron for ductile casting having the above-described configuration, the hot water stored and retained in the holding furnace 1 is received by the ladle 7 and transported to the graphite spheroidizing apparatus 8. To melt the cast iron for ductile casting, and then to the waste disposal device 11 to discharge the slag in the ladle 7, and then to dispose the molten cast iron for ductile casting in a casting facility such as a centrifugal casting machine. Since the ladle 7 is not lifted by a crane, etc. in the process until it is transported to the place where it was transported, most of the work can be performed by automatic operation, and labor saving and improvement in productivity due to labor saving are achieved. Is done.
[0036]
Note that the present invention is not limited to the above embodiment, and various modifications are possible. For example, the holding furnace 1, the graphite spheroidizing apparatus 8 and the waste treatment apparatus 11 are arranged side by side in the horizontal direction, but there is no need to arrange them, and they may be opposed to each other. The number is not limited to a group, and a plurality of groups may be used. Further, the configuration of the roller table may be any configuration as long as the device can transfer the ladle 7.
[0037]
【The invention's effect】
According to the present invention, when producing a ductile casting, the original hot water stored and retained in the holding furnace is received in a ladle, and then transferred to a graphite spheroidizing apparatus and melted into a molten cast iron for ductile casting. In addition, in the process up to removing the slag in the ladle as necessary, there is no need to lift the ladle with a crane or the like, so most operations can be automated, and a series of operations can be performed with extremely few operators. Work can be dealt with. As a result, labor saving and productivity improvement accompanying labor saving are achieved, and an industrially beneficial effect is brought.
[Brief description of the drawings]
FIG. 1 is a view showing an embodiment of the present invention, and is a schematic plan view showing the entire configuration of a facility for smelting molten cast iron for ductile casting according to the present invention.
FIG. 2 is an enlarged side view of the transport vehicle shown in FIG.
FIG. 3 is an enlarged plan view of the transport vehicle shown in FIG. 1;
FIG. 4 is an enlarged side view of the roller table shown in FIG. 1;
FIG. 5 is an enlarged plan view of the roller table shown in FIG. 1;
FIG. 6 is a schematic side view of the waste disposal apparatus shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Holding furnace 2 Roller table 3 Roller table 4 Carriage 5 Roller table 6 Rail 7 Ladle 8 Graphite spheroidizing processing device 9 Roller table 10 Roller table 11 Waste treatment device 12 Slag pot 13 Waste station 14 Roller table 15 Conveying cart 16 Roller table 17 Rail 18 Pouring gutter 19 Roller 20 Wheels 21 Cart drive motor 22 Bearing 23 Roller drive motor 24 Reducer 25 Rail 26 Trunnion 27 Mount 28 Base 29 Hydraulic cylinder 30 Tilt arm 31 Tilt axis 32 Base 33 Laser sensor 34 Laser sensor

Claims (6)

A holding furnace for storing the hot water melted in the melting furnace, a ladle for receiving the hot water stored in the holding furnace, and a graphite spheroidizing apparatus for adding a graphite spheroidizing agent to the hot water in the ladle; A molten iron for molten cast iron for ductile casting, comprising a ladle mounted between the holding furnace and the graphite spheroidizing apparatus, the ladle being self-propelled and the ladle mounted thereon being further mounted thereon. A carrier truck having a ladle moving means for moving the ladle, and a ladle carrier means for moving the ladle between the carrier and the carrier truck are provided, and the ladle is lifted. A molten cast iron for ductile casting, wherein the molten iron is transferred from a holding furnace to a graphite spheroidizing apparatus by a carrier truck and a ladle transferring means without any trouble. A holding furnace for storing the hot water melted in the melting furnace, a ladle for receiving the hot water stored in the holding furnace, and a graphite spheroidizing apparatus for adding a graphite spheroidizing agent to the hot water in the ladle; A waste treatment apparatus for discharging slag in the ladle from the ladle after completion of the graphite spheroidizing treatment, and a molten cast iron for ductile casting, comprising: the holding furnace and the graphite spheroidizing treatment apparatus. Between the trolley and the waste treatment device, a transport trolley having a ladle moving means for mounting a ladle and moving on the ladle and moving the loaded ladle thereon; And a ladle conveying means for moving the ladle back and forth and moving the ladle, wherein the ladle is not lifted up, and the graphite spheroidizing apparatus and the discharge device are discharged from the holding furnace by the carrier cart and the ladle transferring means. Dactor characterized by being moved to a slag processing device Smelting facilities Le casting for molten cast iron. The ladle moving means and the ladle moving means are of a roller table type for moving a ladle mounted on the roller by rotating the roller, wherein the ladle is moved. Equipment for molten cast iron for ductile castings. The carrier truck travels on one straight line, and the ladle transfer means is provided in a direction in which the ladle moves in a direction substantially perpendicular to the traveling direction of the carrier truck. The molten iron casting equipment for ductile casting according to any one of claims 1 to 3, wherein The molten cast iron for ductile casting according to any one of claims 1 to 4, wherein the position of the carrier is detected by a laser sensor. The hot water stored in the holding furnace is received in a ladle, a graphite spheroidizing agent is added into the ladle, and then the slag in the ladle is discharged to melt molten cast iron for ductile casting. After receiving the hot water from the holding furnace, move the ladle without lifting it until the slag in the ladle is discharged, and melt the molten cast iron for ductile casting from the hot water. A method for producing molten cast iron for ductile casting.

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