JP2012219922A - Transfer piping and transfer system for molten metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide transfer piping for molten metal with high efficiency of production and capable of suppressing even permeation of the molten metal, and to provide a transfer system for the molten metal capable of eliminating the need for maintenance or replacement of piping in long term usage, or prolonging the period until maintenance without residual and solidification or the like of the molten metal in the piping even when used for a long time.SOLUTION: Pieces of transfer piping 1A, 1B for molten metal include metal piping 1a, and a lining body constituted by pressing a laminate of annular ceramic fiber blankets 1b arranged in an inner side of the metal piping 1a at at least ≥250 kg/m; and a compressed attitude of the pressed lining body is held by pressing members 1c, 1c. A transfer system 10 for the molten metal is constituted of plated pots 2, 3 lined by ceramic fiber blocks 2b, 3b pressed at at least ≥250 kg/m, and a piping system constituted of the pieces of transfer piping 1A, 1B.

Description

  The present invention relates to a pipe for transferring molten metal in a plating process on the surface of a metal strip and a transfer system including the pipe.

  As a molten metal transfer system applied when a molten metal such as molten zinc or molten aluminum is plated on a conventional metal strip, a plating bath made of molten metal M is accommodated as shown in FIG. A plating pot P1 in which a metal strip K is immersed in the plating bath and plating is performed, a plating pot P2 that replenishes the molten metal M to the plating pot P1, and the plating pots P1 and P2 are connected and melted. The form comprised from piping PP with which a metal distribute | circulates can be mentioned.

After the plating process, the molten metal adheres to the metal strip K from the plating pot P1, and the molten metal is lifted from the plating pot P2 by an appropriate pump P, and is replenished to the plating pot P1. (X1 direction). Pipe PP The illustrated vertical pipe PP _V, bend the pipe PP _E, are those horizontal pipe PP _H are integrally and continuously, both ends of the pipe PP is a fixed configuration in both the plating pot P1, P2 ing.

  By the way, since the molten metal M in the plating pots P1 and P2 needs to be maintained at a certain temperature higher than the melting point of zinc, aluminum or the like, in order to withstand such a high temperature, the metal container S (iron skin) Plating pots P1 and P2 are configured by lining a heat insulating brick or a refractory brick B on the surface.

  Since this heat resistance is also required for the pipe PP for fluidly communicating the plating pots P1, P2, the pipe PP has a configuration in which the inside of the metal pipe is lined with a refractory material. In some cases, a method of preheating a pipe to prevent the molten metal from adhering to the pipe is applied.

  When lining refractory bricks inside metal containers and metal pipes, the molten metal oozes out from the joint between the refractory bricks and the refractory bricks in the process of using the plating pot for a long time, and the durability of the metal containers and metal pipes There was a problem of lowering.

  In addition, there is a problem that lining work with refractory bricks requires skill and a problem that the lining work time takes a long time, and furthermore, the weight of the refractory bricks increases the weight of the plating pot itself, In addition, the refractory in the pipe is cracked during transportation work, making installation difficult, and a considerable thickness of refractory is required to prevent the temperature of the melt in the pipe from decreasing. There was also a problem that a large pipe had to be applied.

  Therefore, a technology has been developed for lining a ceramic fiber that is excellent in heat resistance and much lighter than refractory bricks inside a metal container or metal pipe. For example, Patent Document 1 discloses refining of non-ferrous metal and A ceramic fiber molded product applied as a part for covering the surface of a member in contact with a non-ferrous metal melt, such as a hot water supply pipe, a pouring tub or an air supply pipe used for equipment such as casting, and a manufacturing method thereof are disclosed. .

  In this patent document, it is disclosed that a cylindrical ceramic fiber molded article is manufactured and provided with a gradient impregnated layer of refractory inorganic powder that has a concentration gradient so that the concentration becomes higher as it is closer to the surface side in contact with the metal hot water. ing.

  However, in such a cylindrical ceramic fiber molded product, there is a difficulty in manufacture when the pipe is not a straight pipe such as a bent pipe or at a connection portion between the pipes. Further, even if an inner surface of a cylindrical molded product is inclined and impregnated with a high-concentration refractory inorganic powder, the degree of inclined impregnation on the inner surface cannot be controlled.

  Further, according to the verification by the present inventors, it has been proved that the molten zinc penetrates into the ceramic fiber if the ceramic fiber is applied as it is.

  Therefore, piping used in such a plating processing system, which is composed of metal piping (iron skin) and a lining body made of ceramic fiber, has high manufacturing efficiency and can suppress the penetration of molten metal. Development is eagerly desired in the art.

  Further, in the conventional plating processing system shown in FIG. 5, when a transfer device such as a pump is stopped due to an emergency power failure or the like, a problem that the molten metal remains in the pipe and solidifies to cause a flow interruption, There is a problem that a crack occurs in a refractory brick due to a shock. Since pipes whose channel cross section has been eroded by solidified molten metal or pipes having cracks are forced to be maintained and replaced, this leads to a further problem that maintenance costs increase.

  In response to these problems, a plating bath made of molten metal is accommodated, a plating pot in which a metal strip is immersed in the plating bath to perform plating treatment, a sub plating pot for replenishing the plating metal with molten metal, With regard to the plating system consisting of pipes that are in fluid communication with these, even when used for a long time, the problem that molten metal remains in the pipe and solidifies, and the cross section of the flow path in the pipe is eroded is solved. Alternatively, development of a molten metal transfer system that eliminates the problem of cracking in piping due to heat shock and eliminates the need for maintenance and replacement of the piping even under long-term use is eagerly desired in the art.

Japanese Patent Laid-Open No. 9-301782

  The present invention has been made in view of the above-described problems, and relates to a pipe for transferring molten metal in a plating process, which is a pipe made of a metal pipe (iron skin) and a lining body made of ceramic fibers. The object of the present invention is to provide a transfer pipe that is high and that can also suppress the penetration of molten metal. Also, a molten metal is accommodated, a plating pot in which a metal strip is immersed in the molten metal to perform the plating process, a sub plating pot for replenishing the molten metal to the plating pot, and a transfer pipe for fluidly communicating them. In the case of a molten metal transfer system comprising a molten metal, even when it is used repeatedly, the molten metal remains in the pipe and solidifies, and the flow passage cross section in the transfer pipe is eroded and maintenance and replacement are forced. An object of the present invention is to provide a transfer system that can eliminate the problem.

In order to achieve the above object, the molten metal transfer pipe according to the present invention comprises a metal pipe and a laminate of an annular ceramic fiber blanket disposed on the inner side of the metal pipe and compressed to at least 250 kg / m ³ or more. And a compression posture of the lining body compression-molded by pressing members provided at both ends of the metal pipe.

An annular ceramic fiber blanket having an initial bulk density of, for example, about 100 to 130 kg / m ³ can be used. In this case, this is inserted into a metal pipe (iron skin) and laminated. A compression force is applied to the laminated body of the annular ceramic fiber blanket, and the bulk density is compression-molded to 250 kg / m ³ or more to form a lining body.

  For example, after holding the pressing member over the lower end of the metal pipe of JIS5K-10K and compressing the blanket laminate formed in the metal pipe, the pressing member is similarly placed on the upper end of the metal pipe. Thus, the compression posture of the compression-molded lining body can be easily maintained by fixing it with metal piping and welding.

  Moreover, according to this manufacturing method, a plurality of annular ceramic fiber blankets are placed in the pipe, not only when the metal pipe is a straight pipe, but also when the pipe is a complicated shape such as a bent pipe or a meander pipe. A laminated body can be formed by being easily inserted, and the compressed posture can be easily held by pressing it with a pressing member at both ends of the pipe while compressing it.

According to the verification by the present inventors, by forming a lining body formed by compression-molding ceramic fibers to at least 250 kg / m ³ or more in a metal pipe, even when used for a long time, molten metal permeates (leaks). ) Has been proven not to.

  Furthermore, since such a lining body is formed in the metal pipe, the pipe can be transferred while maintaining the fluid state of the molten metal without heating the pipe with a heater or the like, or heating and keeping it with a burner or the like. it can. In addition, since the ceramic fiber has elasticity, there is no occurrence of cracks due to heat shock even in the event of an emergency stop of the system.

In addition, the transfer pipe includes an expansion / contraction part in the middle thereof, and the expansion / contraction part includes at least a laminated body of a metal bellows pipe and an annular ceramic fiber blanket disposed inside the bellows pipe. and 250 kg / m ³ or more compression molded formed by lining body, is composed of, preferably compressed position of the lining member which is compression molded at pressing member provided at both ends of the bellows pipe is held.

  For example, in the configuration like the pipe PP shown in FIG. 5, since the pipe PP is fixed at two ends by two plating pots P1 and P2, the pipe PP is damaged when the pipe PP is thermally expanded. There is a high risk that the stress concentration will be damaged due to excessive stress concentration at the fixed end.

Therefore, in the middle of the pipe where straight pipes and bent pipes are continuous, it is composed of a metal bellows pipe and a lining body in which a laminated body of annular ceramic fibers is compression molded to at least 250 kg / m ³ or more. By providing the expansion / contraction part, deformation at the time of thermal expansion of the pipe fixed at both ends can be absorbed by the expansion / contraction part, and damage to the transfer pipe and its end can be suppressed.

  The inner diameter of the annular lining is preferably 20 mm or more.

  According to the present inventors, when the inner diameter of the lining body is less than 20 mm, the knowledge that there is a problem that the diameter is too small and the molten metal is clogged, particularly at the bent portion, has been obtained. The inside diameter of the body is defined within the above numerical range.

The present invention also extends to a molten metal transfer system provided with the above-described molten metal transfer pipe of the present invention. This transfer system contains molten metal, and the metal strip is immersed in the molten metal. A first plating pot that performs the plating process, a second plating pot that replenishes the first plating pot with molten metal, and a molten metal transfer pipe that fluidly communicates the first and second plating pots. The first and second plating pots are composed of a metal container and a lining body in which a ceramic fiber block compression-molded to at least 250 kg / m ³ or more is disposed inside the metal container, It is comprised from.

Not only the transfer pipe, but also the first plating pot that actually performs the plating process and the second plating pot that replenishes the first plating pot with fresh molten metal, the metal containers (iron skin) Since the lining made of a ceramic fiber block compression-molded to at least 250 kg / m ³ or more is disposed on the inner side, the molten metal can flow and the continuous operation can be performed without infiltrating the molten metal. .

Here, as the lining method of the lining body composed of ceramic fiber blocks to the plating pot, the ceramic fiber folded in an accordion shape is wrapped with a card board, and further vertically and horizontally wound with a band and compressed to 250 kg / m ³ or more. The ceramic fiber block is formed, and the ceramic fiber block is sequentially inserted into bolts welded to the inner surface of the metal container and lined so as to be adjacent to each other.

  The molten metal transfer system further includes a control unit, and the control unit controls a flow rate of the molten metal flowing in the transfer pipe to be 0.1 m / second or more. preferable.

  According to the present inventors, when the flow rate of the molten metal flowing through the lining body made of ceramic fiber that is hardly reactive with metal is 0.1 m / sec or more, the inner surface of the lining body is at most about 1 to 2 mm. It has been demonstrated that only a solidified layer of molten metal with a thickness of 10 mm is produced and does not develop to a greater thickness. This is a valid result not only for straight pipes but also for bent pipes. Since the solidified layer left in the transfer pipe is not impregnated with the ceramic fiber, it is possible to remove only the solidified layer.

  Furthermore, it is preferable that the transfer pipe has a continuous vertical section and a substantially horizontal section, and the substantially horizontal section has a gradient.

  When the operation of the pump is stopped, the piping should be completely emptied to prevent the molten metal from remaining and solidifying.

  Therefore, in a pipe having a substantially horizontal section, this is not a completely horizontal section, but is inclined in the direction from the first plating pot side to the second plating pot side or in the opposite direction. By setting it as the “substantially horizontal section”, it is possible to easily allow the molten metal to flow into any one of the plating pots, and to prevent the molten metal from remaining in the substantially horizontal section.

  As can be understood from the above description, according to the molten metal transfer pipe of the present invention, it is possible to provide a transfer pipe that has high manufacturing efficiency and can suppress the penetration of the molten metal. Further, according to the molten metal transfer system of the present invention, even when used for a long time, the molten metal remains in the transfer pipe and does not solidify. Further, the transfer pipe is cracked by heat shock. Therefore, it is possible to provide a molten metal transfer system that eliminates the need for maintenance and replacement of piping under long-term use, or can extend the period until maintenance.

(A) is an external appearance perspective view of the molten metal transfer piping of this invention, (b) is a bb arrow line view of (a). (A) is the schematic diagram explaining the manufacturing method of the transfer piping shown in FIG. 1, (b) is a perspective view of a cyclic | annular ceramic fiber blanket. It is a longitudinal cross-sectional view of the expansion-contraction part (expansion piping) which comprises transfer piping. It is the schematic diagram explaining the transfer system of the molten metal of this invention. It is the schematic diagram explaining the transfer system of the conventional molten metal.

  Embodiments of a molten metal transfer pipe according to the present invention and a molten metal transfer system according to the present invention having the transfer pipe will be described below with reference to the drawings.

(Transfer piping and its manufacturing method)
FIG. 1a is an external perspective view of a molten metal transfer pipe of the present invention, and FIG. 1b is a longitudinal sectional view taken along line bb of FIG. 1a. FIG. 2a is a schematic view for explaining a method of manufacturing the transfer pipe shown in FIG. 1, and FIG. 2b is a perspective view of an annular ceramic fiber blanket.

  A transfer pipe 1A shown in FIG. 1 is used in a molten metal transfer system which will be described later. A metal pipe 1a and an annular ceramic fiber blanket 1b are laminated and compressed to line the inside of the metal pipe 1a. It is generally composed of a lining body.

  The metal pipe 1a is composed of a straight main body portion and a flange portion 1af having bolt holes 1aa at both ends thereof. As is apparent from the longitudinal sectional view shown in FIG. Are attached to the main body by pressing members 1c and 1c fixed by welding or the like. As the metal pipe 1a, a carbon steel pipe for piping (SGP) can be applied.

  Next, a manufacturing method of the transfer pipe 1A will be described with reference to FIG. In FIG. 2a, the compression jig J is comprised from the receiving plate J1 which mounts the transfer piping 1A, the long volt | bolt J2 attached to the center part, free presser plate J3, and nut J4. First, the holding member 1c is attached in advance to the lower end of the transfer pipe 1A, and the compression jig J is fixed to the flange portion 1af of the pipe 1A with a bolt.

  Next, the annular ceramic fiber blanket 1b shown in the perspective view of FIG. 2b is laminated to a length approximately twice that of the pipe 1A, and the pressing member 1c and then the pressing plate J3 are passed through the long bolts J2 on the upper surface. The ceramic fiber blanket 1b provided by rotating the nut J4 is compressed downward and tightened.

When the presser plate J3 is tightened until it comes into contact with the upper flange portion 1af, the presser member 1c is welded and fixed to the upper flange portion 1af from the notch portion of the presser plate J3. Next, the nut J4 of the compression jig J is removed, the compression jig J is taken out, and the manufacture of the transfer pipe 1A is completed. In addition, as the initial ceramic fiber blanket 1b to be laminated, one having an initial bulk density of about 100 to 130 kg / m ³ which is generally commercially available can be used.

According to the verification by the present inventors, the inside of the metal pipe is a pipe lined with a liner made of a ceramic fiber blanket that is compression-molded to at least 250 kg / m ³ or more. In addition to being able to withstand the melting temperature of molten metal such as molten aluminum, it has been confirmed that the molten metal does not penetrate even when used for a long time.

  Also, the inner diameter φ of the inner space 1b 'of the annular ceramic fiber blanket 1b shown in Fig. 2b is preferably in the range of 20 mm or more.

  When the inner diameter φ of the blanket 1b is less than 20 mm, the lower limit value is defined based on the knowledge of the present inventors that there is a problem that the molten metal is clogged particularly at a bent portion because the diameter is too small.

  The transfer pipe targeted by the present invention includes not only the straight pipe shown in FIGS. 1 and 2 but also the bent pipe 1B (transfer pipe) shown in the system configuration diagram of FIG. A configured piping system, a piping system in which a straight pipe and a bent pipe are integrated to form a substantially L-shaped line, and a straight pipe and a bent pipe are integrated to form a substantially U-shaped line. Various forms of piping systems, such as forms of piping systems, can be formed.

  In addition, in the above-described arbitrary linear piping system, there is also a piping system having a configuration in which an expansion / contraction transfer piping 1C forming an expansion / contraction portion shown in FIG. 3 is interposed.

  When the telescopic transfer pipe 1C illustrated in the piping system is interposed, both ends of the piping system forming a substantially U-shaped line in the system shown in FIG. This thermal deformation can be absorbed by the expansion / contraction transfer pipe 1C when the part or the whole is thermally expanded or contracted, and damage to the pipe or its fixed end can be suppressed.

Returning to FIG. 3, the illustrated telescopic transfer pipe 1C includes a metal bellows pipe 1a ′ having flanges 1a′f at both ends, a heat insulating bulk body 1a ″ disposed inside the bellows pipe 1a ′, A pressing member 1c ′ provided at both ends of the bellows pipe 1a ′, and a lining formed by compression-molding a laminated body of the annular ceramic fiber blanket 1b to at least 250 kg / m ³ or more, The compression posture of the lining body compression-molded at 1c ′ is maintained.

  In the telescopic transfer pipe 1C, the bellows pipe 1a 'on the outer periphery tends to extend due to the laminated body of the blanket 1b in a compressed posture. Therefore, normally, the compression posture of the laminate of the blanket 1b in the expansion / contraction transfer pipe 1C is held by a tie rod T or the like indicated by a dotted line in FIG. 3, and this expansion / contraction with the pipe 1A or the bent pipe 1B or the like shown in FIGS. After connecting the transfer pipe 1C, the tie rod T is released to form a desired linear pipe system.

(Plating treatment system)
FIG. 4 is a system configuration diagram schematically showing the molten metal transfer system of the present invention. The transfer system 10 shown in the figure includes a first plating pot 2 in which a molten metal M such as molten zinc or molten aluminum is accommodated, and a metal strip K is immersed in the molten metal M to perform plating. A second plating pot 3 for replenishing the molten metal M to the plating pot 2 and a substantially U-shaped pipe (transfer pipe 1A, bent pipe 1B, fluid communication between the first and second plating pots 2 and 3; It is comprised from the piping system which consists of expansion-contraction transfer piping 1C.

As shown in FIGS. 1 to 3, the transfer pipe 1 </ b> A, the bent pipe 1 </ b> B, and the telescopic transfer pipe 1 </ b> C constituting the piping system are arranged on the inner side of the outer peripheral metal pipe 1 a and the metal bellows pipe 1 a ′. The laminate is provided with a lining body compression-molded to at least 250 kg / m ³ or more which is about twice or more of the initial bulk density, and the first and second plating pots 2 and 3 are each made of metal. Like the pipes, the containers 2a and 3a and the lining body in which the ceramic fiber blocks 2b and 3b compression-molded to at least 250 kg / m ³ or more are lined inside the metal containers 2a and 3a.

The lining of the ceramic fiber blocks 2b and 3b on the plating pots 2 and 3 is made by wrapping ceramic fibers folded in an accordion shape with a card board, and then winding them vertically and horizontally with a band to 250 kg / m ³ or more. The compression-molded ceramic fiber blocks 2b and 3b are manufactured, and the ceramic fiber blocks 2b and 3b are sequentially inserted into bolts (not shown) welded to the inner surfaces of the respective metal containers 2a and 3a and lined so as to be adjacent to each other. Thus, the plating pots 2 and 3 are produced.

  In the illustrated piping system, a transfer pipe 1A extending in the vertical direction fixed to the second plating pot 3, a transfer pipe 1A extending substantially horizontally at a gradient of angle θ, and fixed to the first plating pot 2 are used. The transfer pipe 1 </ b> A extending in the vertical direction and the bent pipes 1 </ b> B and 1 </ b> B connecting these pipes are further formed, and the telescopic transfer pipe 1 </ b> C is interposed in a part thereof.

  By operating the transfer pump 4, the fresh molten metal M is continuously sent to the first plating pot 2, and the metal strip K is immersed in the plating bath in the first plating pot 2 to bring the molten metal M to the surface. It is made to adhere and is conveyed from the 1st plating pot 2, and the continuous operation | movement of a plating process and molten metal feeding is performed within the system 10 shown in figure.

The piping system and the first plating pot 2 and the second plating pot 3 are both ceramics compression-molded to at least 250 kg / m ³ or more inside the metal pipes 1a, 1a ′ and the metal containers 2a, 3a. It is not necessary to heat the pipe with a heater or the like to prevent the molten metal from solidifying or to keep it warm with a burner or the like because it is lined with a lining made of fiber blanket 1b and ceramic fiber blocks 2b and 3b. Can be operated continuously.

  Moreover, the transfer system 10 shown in the figure includes a computer 7 having a built-in control unit for controlling the flow rate when flowing molten metal in the piping system to 0.1 m / second or more with respect to the transfer pump 4.

  On the premise that ceramic fiber is hardly reactive with metal, the inner surface of the lining body is at most 1 to 2 mm by adjusting the flow rate of the molten metal flowing through the lining body made of ceramic fiber to 0.1 m / second or more. It has been proved by the present inventors that only a solidified layer of molten metal having a thickness of about a thickness can be formed, and that it does not develop beyond that, and that the surface of the lining body is not impregnated with the solidified layer.

  Due to the flow rate control described above, there can be no problem that molten metal remains in the pipe, which solidifies and disturbs the flow. Furthermore, even when the transfer pump 4 is stopped due to an emergency power failure or the like, the transfer pipe is lined with a lining body made of elastic ceramic fiber, so that there is a problem that a crack occurs here due to heat shock. It cannot happen.

  Moreover, it is preferable that the transfer pipe 1A extending substantially horizontally in the illustrated piping system has a gradient.

  From the rule of thumb by the present inventors, in order to minimize the molten metal remaining and solidifying in the piping system when the operation of the transfer pump 4 is stopped, it has been defined that there is a gradient in a substantially horizontal section. Is.

  Further, as described above, the inner diameter φ of the inner space 1b ′ of the annular ceramic fiber blanket 1b constituting the piping system is adjusted to 20 mm or more, so that a molten metal transfer amount of 0.75 ton / hour or more can be obtained. The system 10 can be continuously operated without causing clogging of the molten metal in the bent pipe 1B.

  Furthermore, the transfer system 10 shown in the figure includes at least the transfer pipes 1A and 1B, and the operation of the transfer pipe under long-term use can be performed by controlling the flow rate of the molten metal as described above. It becomes possible to eliminate the need for replacement or to prolong the period until maintenance. Further, not only the transfer from the second plating pot 3 to the first plating pot 2, but also the second plating pot 3 for replacing the plating solution of the first plating pot 2 (changing the plating material). It can also be transferred. In addition, this transfer system is a technique applicable also to the installation which continuously metal-plates a molten metal to a steel strip.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

DESCRIPTION OF SYMBOLS 1A ... Transfer pipe (straight pipe), 1B ... Transfer pipe (curved pipe), 1C ... Expansion / contraction transfer pipe (expandable part), 2 ... First plating pot, 2a ... Metal container, 2b ... Lined body, 3 ... Second 3 ... Metal container, 3b ... Lined body, 4 ... Transfer pump, 5 ... Snout, 6 ... Sink roll, 7 ... Computer (control part), 10 ... Molten metal transfer system, M ... Molten metal (plating) bath)

Claims (6)

Metal piping,
A laminated body of an annular ceramic fiber blanket disposed inside the metal pipe is formed by compression molding to at least 250 kg / m ³ or more, and
Molten metal transfer piping in which the compression posture of the lining body compression-molded by holding members provided at both ends of the metal piping is maintained. The transfer pipe has an expansion / contraction part in the middle position thereof,
The expansion / contraction part is composed of a metal bellows pipe and a lining body formed by compression-molding a laminate of an annular ceramic fiber blanket disposed inside the bellows pipe to at least 250 kg / m ³ or more. The molten metal transfer pipe according to claim 1, wherein the compression posture of the lining body compression-molded by holding members provided at both ends of the bellows pipe is maintained.   The molten metal transfer pipe according to claim 1 or 2, wherein an inner diameter of the annular lining body is 20 mm or more. A first plating pot that contains molten metal, and a metal strip is immersed in the molten metal to perform plating; a second plating pot that replenishes the first plating pot with molten metal; The molten metal transfer pipe according to any one of claims 1 to 3, wherein the plating pot of 2 is in fluid communication.
The first and second plating pots are composed of a metal container and a lining body in which a ceramic fiber block compression-molded to at least 250 kg / m ³ or more is disposed inside the metal container. Molten metal transfer system. The molten metal transfer system further includes a control unit,
The molten metal transfer system according to claim 4, wherein a flow rate of the molten metal flowing through the transfer pipe is controlled to 0.1 m / second or more by the control unit.   The molten metal transfer system according to claim 4 or 5, wherein the transfer pipe has a vertical section and a substantially horizontal section continuous, and the substantially horizontal section has a gradient.

Images