JP2011042850A - Dezincification apparatus and dezincification method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dezincification apparatus which can extremely inexpensively and surely remove zinc, and to provide a dezincification method therefor. <P>SOLUTION: This dezincification apparatus includes: an induction heating container 50 which has an input port for charging a scrap steel sheet 41 and becomes an external container of the dezincification apparatus 2; induction heating coils 60 and 61 which are wound around the outer circumference of the induction heating container 50 and connected to a high-frequency power source apparatus; and a hollow pipe 70 which is made from an alloy steel and is a hollow rod-like body provided so as to rise in the center of the induction heating container 50. The inside of the container is controlled to be a reducing atmosphere by a charged carbon-containing material 42. The hollow pipe 70 has slits 71, 72 and 73 for discharging zinc vapor and the like to the outside formed therein. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an induction heating type dezincing apparatus and a dezincing method for heating a galvanized steel sheet to evaporate and remove zinc.

  2. Description of the Related Art Conventionally, in the casting industry, the proportion of scrap steel plates that are melted into raw materials for cast iron has increased, and galvanized steel plates are typical of scrap steel plates that are reused. An electric furnace melting method is commonly used as a means for melting scrap steel plates, but there are various problems when melting galvanized steel plates. For example, if a galvanized steel sheet is melted as it is, zinc penetrates and passes through the furnace refractory, damages the heating coil, shortens the life of the melting equipment, and increases maintenance costs. In addition, zinc has a low boiling point and easily evaporates, which may lead to deterioration of the working environment due to zinc vapor, and may deteriorate the quality due to zinc being mixed into the product.

  In order to solve such a problem, in order to melt and separate zinc in advance before the galvanized steel sheet is melted, it is generally performed to pretreat the galvanized steel sheet by a vacuum heating type dezincing equipment.

  Also, an induction heating type dezincing device as shown in Patent Document 1 has been proposed. According to this induction heating type dezincing apparatus, the zinc coil is melted by energizing the heating coil by inductively heating the galvanized steel sheet, and the zinc white produced by evaporation of a part of the molten zinc is externally discharged from the material discharge port. Can be exhausted.

JP-A-8-83676

  However, in the apparatus of Patent Document 1 described above, heat does not reach the galvanized steel sheet located in the central portion of the heating cylinder, and is transported to the induction melting furnace in a state where zinc removal is insufficient and zinc is oxidized, Zinc may be mixed into the product. In particular, the zinc during processing is easily oxidized when exposed to the atmosphere. When zinc oxide is generated on the surface of the steel plate scraps with a distorted shape, the zinc oxide powder accumulates and is applied to a sieve or applied vibration. However, it cannot be easily removed. Further, the sublimation point of zinc oxide is about 1725 ° C., which exceeds the melting point of iron (about 1535 ° C.), and it is difficult to volatilize and remove zinc oxide with the above apparatus.

  On the other hand, vacuum heating type dezincification equipment that is effective in terms of zinc removal is expensive in equipment cost, requires a large installation space, and requires maintenance costs to maintain the degree of vacuum. Not only costs but also running costs tend to increase. That is, although vacuum heating type dezincification equipment is suitable for intensive dezincing treatment in a dedicated large-scale facility, it is unsuitable as dezincing treatment in a small-scale casting factory. In addition, scrap steel sheets that have been dezinced by high-temperature heating in a dedicated facility must be cooled for transport to a foundry by a truck or the like, and when used as a melting raw material in a foundry, It has returned to room temperature. That is, the thermal energy required for the dezincing treatment is completely wasted, and the equipment is large in terms of energy efficiency.

  Therefore, the present invention has been made in view of the above problems, and provides a space-saving dezincing apparatus and a dezincing method that can be reliably dezinced at an extremely low cost and can be introduced into a foundry. Objective. It is another object of the present invention to provide a dezincing apparatus and a dezincing method that efficiently use thermal energy required for dezincing treatment and reduce energy loss.

  In order to solve the above-described problems, a dezincing apparatus according to the present invention includes a heating container having an inlet for charging a galvanized steel sheet, and a heating wound around the outer periphery of the heating container and connected to a heating power source. A coil and a rod body standing inside the heating container are provided.

  According to this, the space-saving type dezincification is configured with extremely simple equipment and the installation area can be reduced, so that the introduction cost is low compared with the vacuum heating type dezincification equipment and can be introduced into the foundry. An apparatus can be realized. In addition, since the rod installed upright inside the device heats up and heats the galvanized steel sheet from inside the device, the heat is distributed inside the device and uniform heating is possible, contributing to reliable zinc removal. Is realized. Furthermore, this equipment can be used as a pretreatment facility for steel sheet melting in a foundry, and by transferring the heated steel sheet to the melting process as it is, the thermal energy required for the dezincing process is wasted. It is also possible to use it without doing it.

  Here, the rod body is preferably a material having an affinity for induction heating, the rod body is hollow, and has a drilling portion that communicates with the inside of the rod body. It is preferable to provide exhaust means for exhausting the gas in the container to the outside through the hollow rod body from the hole drilling portion.

  According to this, not only the heat generation of the galvanized steel sheet itself, but also the rod inside the device is easily induction-heated, it is easy to spread the heat into the device, and the hollow shape from the drilled portion of the hollow rod The zinc vapor inside the apparatus is discharged through the rod body, and the rod body functions as a discharge path for zinc vapor.

  Moreover, it is preferable to provide a plurality of the heating coils, and each heating coil is preferably heated at a different temperature, and among the plurality of heating coils, it is more preferable that the heating coil positioned below is heated at a high temperature.

  According to this, the heating temperature to a galvanized steel plate can be set in steps, and the dezincing apparatus which can be heated efficiently according to the state of a galvanized steel plate is implement | achieved.

  Furthermore, the dezincing device may include a plurality of the heating coils and energize each heating coil at a different frequency.

  According to this, since the heating coil is energized at a different frequency, it is possible to set the heating conditions in consideration of the rate of temperature rise, power consumption, and soaking in the apparatus.

  It is also preferable that a plurality of the hole drilling portions are formed and the diameter or / and the number of the hole drilling portions are different from the upper part to the lower part of the rod body.

  According to this, the amount of zinc vapor sucked can be adjusted by changing the diameter and number of the drilling portions, and the temperature and reducing atmosphere can be set according to the position in the apparatus. A device is realized.

  In addition, by providing a plurality of the rod bodies standing inside the heating container, the heating in the apparatus can be made more uniform. In addition, multiple rods or one rod body is set up in the center of the heating vessel that is far from the heating coil and the galvanized steel plate is difficult to be heated, and the rod body generates heat. Heating of the plated steel sheet can be promoted, and variations in temperature with the galvanized steel sheet close to the coil can be suppressed.

  Here, the dezincing apparatus further includes a discharge means for discharging the steel plate from which zinc has been removed to the outside of the apparatus by a predetermined amount below the heating container, so that the dezincing treatment of the scrap steel sheet can be performed batchwise. A possible dezincing device is realized.

  Furthermore, the heating container is a metal container, and an inner wall in contact with the galvanized steel sheet can be used as an insulating heat insulating material. A part of the side surface of the metal container is partitioned by an insulating heat insulating material in the vertical direction, so that the induction current can be prevented from flowing in the circumferential direction.

  This prevents melting and deterioration of the heating container due to local heating, and sparks due to conduction between the inside of the heating container and the galvanized steel sheet, so that the dezincing apparatus has excellent wear resistance. Furthermore, rapid heating of the metal container can be prevented.

  The present invention also relates to a dezincing method for removing zinc by evaporating and removing zinc by heating the galvanized steel sheet, wherein the galvanized steel sheet and the carbon-containing material are provided in a heating container having an inlet for charging the galvanized steel sheet. Inductive heating of the galvanized steel sheet by a heating coil that is wound around the outer periphery of the heating vessel and connected to a heating power source, and a hollow rod is erected inside the heating vessel, and the rod The zinc in the galvanized steel sheet is evaporated and removed by heating with heat generated by the heat, and the carbon-containing material is reacted with oxygen in the container to generate carbon monoxide gas. In a reducing atmosphere, the oxidation of zinc is suppressed, and the evaporated zinc and the generated carbon monoxide gas are externally supplied from the hole formed in the rod body through the inside of the hollow rod body. It is characterized by discharging to It can be implemented as dezincification method of. As the carbon-containing material, coke, carburized material, coal and the like are suitable. Further, the carbon-containing material may be replaced with a galvanized steel plate together with a galvanized steel plate, in advance by fixing a carbon rod or the like in the heating vessel in advance, and appropriately replacing it depending on the degree of wear.

  Further, as this dezincification method, it is preferable to pass a gas for adjusting the reducing atmosphere into the heating vessel, and in the direction of discharging the evaporated zinc and the generated carbon monoxide gas to the outside. More preferably, the rod body is ventilated.

  According to this, since the galvanized steel sheet is uniformly heated inside the apparatus while keeping the inside of the apparatus in a reducing atmosphere and suppressing the generation of zinc oxide, efficient and reliable zinc removal can be realized.

  As described above, according to the dezincing apparatus and the dezincing method according to the present invention, since it is configured with simple equipment, the installation area is small, the cost is low, and it can be easily introduced into a foundry. In addition, since the rod standing inside the heating container plays a role of heating from the inside to the outside of the device, sufficient heat can be applied to the galvanized steel sheet placed in the center of the furnace, ensuring Zinc removal can be realized.

It is a figure which shows the outline of a dezincification apparatus. It is a figure which shows the structural example of a hollow pipe. It is a figure which shows the outline of the dezincification apparatus which concerns on 2nd Embodiment. It is a figure which shows the internal structure of the dezincification apparatus which concerns on 2nd Embodiment.

  Hereinafter, a dezincing apparatus and a dezincing method according to the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an outline of a dezincing apparatus.

  The dezincing apparatus 1 is an induction heating type dezincification furnace that evaporates zinc by heating a galvanized steel sheet, and includes an induction heating vessel 10, an induction heating coil 20, and a hollow pipe 30.

  The induction heating container 10 is a container for heating the scrap steel plate 41. The induction heating container 10 is provided with a charging port for charging the scrap steel plate 41 and the carbon-containing material 42 at the upper part, so that zinc vapor generated by the heat treatment after charging does not leak from the upper part of the container. At the same time, a container lid 11 for sealing the upper part of the container is provided in order to prevent zinc oxide from being generated in the scrap steel plate 41 in the vicinity of the inlet when air enters the apparatus from the inlet. Further, a tilting mechanism 12 that tilts the container to discharge the scrap steel plate after the heat treatment is also provided.

  The induction heating coil 20 is wound around the outer periphery of the induction heating container 10 and is connected to an induction heating power source (not shown). When a high frequency power supply device of 0.5 to 10 kHz is used as the induction heating power source and the induction heating coil 20 is energized from the induction heating power source, the scrap steel plate 41 charged into the induction heating container 10 from the inlet is induction heated. Become.

  The hollow pipe 30 is a hollow rod body standing in the induction heating container 10. The hollow pipe 30 is formed with a hole for forming a zinc vapor discharge port, which is formed with a drilling portion, that is, a slit 31. The hollow pipe 30 sucks the inside of the pipe from the lower part of the apparatus and hollows out the zinc vapor and dust inside the apparatus from the slit 31. It discharges to the outside through the pipe 30. Here, as shown in FIG. 2, the hollow pipe 30 may be structured to be sucked and exhausted from the inner tube 33 as a double tube of the outer tube 32 and the inner tube 33. In this case, air flows in from the outer tube 32 by the amount sucked by the inner tube 33 (A direction in FIG. 2), and after being heated in the tube, zinc and carbon monoxide are oxidized to form zinc oxide from the inner tube 33. It discharges in the form of carbon dioxide (direction B in FIG. 2). The hollow pipe 30 is made of a material that is easily induction-heated, that is, a material having affinity for induction heating, and the pipe itself is heated as the temperature inside the container rises. Since the scrap steel plate 41 in the vicinity of the pipe is heated by the heat transfer of the hollow pipe 30, it is possible to promote the heating of the scrap steel plate 41 put into a place where heat in the container is difficult to reach.

  Thus, the dezincification apparatus 1 is comprised by the very simple installation, and the installation area can also be made small. Therefore, the introduction cost is low compared with the vacuum heating type dezincing equipment, and a large installation space is not required, so it can be easily introduced into a foundry, etc. It can be used as equipment. That is, since the treated scrap steel plate discharged from the tilting mechanism 12 after being heated can be transferred to the melting process as it is, the heat energy required for the dezincing process (heating by the induction heating coil 20) is wasted. The heat energy can be utilized without making it.

  Further, not only the scrap steel plate 41 but also the carbon-containing material 42 is introduced into the container, and the container lid 11 that seals the upper part of the apparatus is provided, so that the generation of zinc oxide can be suppressed by using the inside of the container as a reducing atmosphere. .

  Further, the hollow pipe 30 erected in the induction heating container 10 is composed of the oil, water, and zinc vapor removed from the scrap steel plate by the heat treatment, and the carbon of the carbon-containing material that has been input is combined with oxygen in the container. Carbon monoxide gas and carbon dioxide gas generated by reaction is sucked and discharged to the outside. In addition, since the pipe itself is heated, it is possible to heat the scrap steel plate 41 put into a place where heat is not easily transmitted from the inside of the container.

  Next, a dezincing apparatus according to a second embodiment in which a preferable improvement is made for the dezincing treatment as compared with the above dezincing apparatus will be described.

  FIG. 3 is a diagram showing an outline of a dezincing apparatus according to the second embodiment, and FIG. 4 is a diagram showing an internal structure thereof.

  The dezincing apparatus 2 includes an induction heating vessel 50, induction heating coils 60 and 61, and a hollow pipe 70 as in the above dezincing apparatus 1.

  The induction heating container 50 is a container for heating the scrap steel plate 41 and has an inlet for charging the scrap steel plate 41 at the top, and is the above-described induction in that it becomes a container outside the dezincing apparatus 2. Common with the heating container 10. However, the induction heating container 50 is different from the induction heating container 10 in that the induction heating container 50 is divided into a preheating tank 51, a first heating tank 52, a second heating tank 53, and an adjustment tank 54 in order from above.

  The preheating tank 51 is a tank for heating the scrap steel plate 41 by heat transmitted from the first heating tank 52 located below the preheating tank 51. Moisture, oil, and the like contained in the scrap steel plate 41 are removed by heat at a temperature up to about 500 ° C. in the preheating tank 51.

  The first heating tank 52 is a tank for heating the scrap steel plate 41 by induction heating by the induction heating coil 60 wound around the outer periphery of the first heating tank 52. In the first heating tank 52, zinc contained in the scrap steel plate 41 is removed by heat at a temperature of about 500 ° C. to 900 ° C.

  The second heating tank 53 is a tank for heating the scrap steel plate 41 by induction heating by the induction heating coil 61 wound around the outer periphery of the second heating tank 53. In the second heating tank 53, zinc in the scrap steel plate 41 that has not been removed in the first heating tank 52, for example, zinc that has been melted and dropped, is removed by heat at a temperature of about 900 ° C. to 1100 ° C. It will be.

  The adjustment tank 54 is a tank for holding and cooling the scrap steel plate 41 after the heat treatment, or adjusting the atmosphere in the apparatus. The scrap steel plate 41 from which zinc has been removed is held in the adjustment tank 54 for a predetermined time and cooled, and then discharged from the discharge unit 55 by a predetermined amount from the discharge unit 55 to the outside of the apparatus. Moreover, the adjustment tank 54 is equipped with the ventilation | gas_flow adjustment valve 56, and gas, such as an inert gas and air, is taken in from here in order to adjust the carbon monoxide gas density | concentration and reducing atmosphere in an apparatus. Yes.

  The scrap steel plate 41 is put into the induction heating container 50 configured as described above and subjected to heat treatment. At this time, the carbon-containing material 42 is also introduced into the container together with the scrap steel plate 41. By introducing the carbon-containing material 42 into the container, the generation of zinc oxide can be reduced using the inside of the container as a reducing atmosphere. That is, carbon reacts with oxygen in the container to become carbon monoxide gas or carbon dioxide gas, and is discharged to the outside through the hollow pipe 70 described later. Can prevent oxidation. In addition, since air is taken in from the ventilation adjustment valve 56 of the adjustment tank 54, oxygen becomes carbon monoxide gas or the like in the order of the second heating tank 53 and the first heating tank 52 located below. The lower the oxygen, that is, the reducing atmosphere becomes stronger toward the upper side of the container.

  Here, the induction heating container 50 may use ceramics such as magnesia as a material, or may be a metal container such as stainless steel (for example, SUS310). Metal containers are more wear resistant than ceramics and are advantageous in terms of operation and maintenance. However, in the case of a metal container, there is a concern about melting and deterioration due to local heating, and generation of sparks due to conduction between the inside of the heating container and the scrap steel plate 41. Therefore, in order to prevent this, an insulating heat insulating material 57 (for example, as an inner wall of the container) , Mica, etc.) are preferably provided.

  The induction heating coils 60 and 61 are wound around the outer periphery of the induction heating container 50 and are connected to an induction heating power source (not shown). When a high frequency power supply device of 0.5 to 10 kHz is used as the induction heating power source and the induction heating coils 60 and 61 are energized from the induction heating power source, the scrap steel plate 41 charged into the induction heating container 50 from the inlet is induction heated. It will be.

  When energizing the induction heating coil, the higher the frequency, the better the rate of increase to the target temperature, and the total power consumption tends to decrease. On the other hand, as the frequency becomes lower, there is a tendency that heat equalization in the apparatus is achieved. In the heating in the first heating tank 52, in order to prevent zinc contained in the scrap steel plate 41 in the apparatus from melting and dripping downward, rapid heating is performed so that zinc vapor can be discharged out of the apparatus as soon as possible. Temperature increase is necessary. Further, in the heating in the second heating tank 53, while it is necessary to reliably remove the remaining zinc, it is important to equalize the temperature in the apparatus in order to prevent melting and fixing of iron due to local heating. In view of the above, the frequency in the induction heating coil 61 wound around the second heating tank 53 should be equal to or less than that of the induction heating coil 60 wound around the first heating tank 52. preferable. Specifically, it is preferable that the induction heating coil 60 has a frequency of 1 to 10 kHz, and the induction heating coil 61 has a frequency of 0.5 to 5 kHz.

  The hollow pipe 70 is a hollow rod that stands at the center of the induction heating container 50. The hollow pipe 70 is formed with a hole for forming a zinc vapor discharge port. The hollow pipe 70 protrudes from the lower part of the apparatus and allows air or the like to flow upward. From the upper part of the apparatus, air is sucked into the pipe. Thus, zinc vapor is discharged to the outside. In this embodiment, the slit 71 is formed at a position corresponding to the preheating tank 51, the slit 72 is formed at a position corresponding to the first heating tank 52, and the slit 73 is formed as a drilling portion at a position corresponding to the second heating tank 53. Is shown. Further, considering that the amount of zinc vapor generated increases toward the bottom of the apparatus, the diameter of the slits 71, 72, 73 is increased in order from the top of the apparatus, and the suction amount of zinc vapor in the apparatus decreases. I try to increase. The shape of the hole-cutting portion is not limited to a vertically long slit, and a plurality of circular holes may be formed. Moreover, it is good also as increasing only the number of holes instead of increasing a diameter from upper direction to the downward direction, and it is good also as increasing a number by reducing a diameter.

  The hollow pipe 70 is made of a material having affinity for induction heating, for example, alloy steel (stainless steel, heat-resistant steel, etc.) as in the case of the dezincing apparatus 1 described above, and the temperature inside the container rises. As the pipe itself heats up. The pipe heated to 800 ° C. or more heats the scrap steel plate 41 in the container from the inside by the heat transfer, so that the heating of the scrap steel plate put in the central portion of the container which is difficult to be induction-heated is promoted. This contributes to an increase in the heating rate of the entire steel sheet in the apparatus. The stainless steel used as the hollow pipe 70 is, for example, austenitic stainless steel (SUS310), austenite-ferrite two-phase stainless steel (SUS329), or ferritic stainless steel (SUS430). Furthermore, if a temperature sensor is additionally provided in the hollow pipe 70 erected at the center of the induction heating container 50, it is possible to measure the temperature not only near the outer periphery of the induction heating container 50 but also near the center of the container. The temperature inside the container can be controlled by adjusting the amount of zinc vapor sucked based on the temperature measurement value near the center of the container, and the temperature inside the container can be equalized.

  The procedure for dezincing the scrap steel plate in the dezincing apparatus 2 configured as described above is as follows.

  First, the galvanized scrap steel plate 41 and the carbon-containing material 42 are put into the induction heating vessel 50.

  In the preheated tank 51, the introduced scrap steel plate 41 is removed of moisture, oil, and the like by heat transmitted from the first heating tank 52 positioned below and heat of the heated hollow pipe 70. The removed moisture and the like are discharged from the slit 71 of the hollow pipe 70 to the outside of the apparatus. In the preheating tank 51, since the carbon-containing material previously charged reacts with oxygen in the lower tank, the atmosphere is extremely strong and zinc oxide is hardly generated. Further, the temperature of the preheating tank 51 decreases as the distance from the induction heating coil 60 decreases, and the temperature in the tank near the charging port decreases, so that the oil and steam of the scrap steel plate 41 near the charging port does not come out of the charging port, There is no risk of ignition when exposed to air, and safety is maintained.

  The scrap steel plate 41 from which moisture and oil have been removed in the preheating tank 51 drops and moves to the first heating tank 52 when the processed scrap steel plate is discharged from the discharge unit 55 to the outside of the apparatus, where the heat treatment is performed. Applied. In the 1st heating tank 52, it produces | generates by reaction of carbon containing materials, such as a carburizing material, coke, coal, and carbon electrode scrap, with oxygen by the induction heating from the induction heating coil 60, and the heat of the heated hollow pipe 70. When heated to a temperature of approximately 500 to 900 ° C. in a reducing atmosphere mainly composed of carbon monoxide gas, zinc vapor is generated and discharged from the slit 72 of the hollow pipe 70 to the outside of the apparatus. In the first heating tank 52, since the carbon-containing material that has been previously charged reacts with oxygen in the lower second heating tank 53, a strong reducing atmosphere is maintained.

  After the heat treatment in the first heating tank 52, the scrap steel plate 41 is dropped and moved to the second heating tank 53 when the processed scrap steel plate is discharged in the same manner as described above, and is subjected to the heat treatment here. In the second heating tank 53, iron / zinc alloy or the like is formed by being heated to a temperature of approximately 900 to 1100 ° C. by the induction heating from the induction heating coil 61 and the heat of the heated hollow pipe 70. As a result, the vapor pressure becomes low, and the zinc component remaining without being removed in the first heating tank 52 is volatilized and removed. Moreover, since the heating in the 2nd heating tank 53 is high temperature, even when it does not volatilize in the 1st heating tank 52 but is dripped at the 2nd heating tank 53 as a molten zinc, it can volatilize in the 2nd heating tank 53. It can be discharged from the slit 73 of the hollow pipe 70 to the outside of the apparatus as zinc vapor.

  Thereafter, the scrap steel plate 41 from which zinc has been removed in the second heating tank 53 is held and cooled in the adjustment tank 54 and then discharged from the discharge unit 55 to the outside by a predetermined amount.

  By adopting a configuration in which scrap steel plates are dezinced in a batch-continuous manner according to such a procedure, it is possible to perform dezincing at a very low cost and reliably.

  As described above, the dezincing apparatus according to the present embodiment includes a heating container, a pipe that is a hollow rod standing at the center of the heating container, a heating coil wound around the heating container, and a heating coil. Because it is a simple facility such as a high-frequency power supply for energizing the battery, it is very inexpensive compared to vacuum heating dezincing equipment and requires only a small installation area. It can be easily introduced into foundries. In addition, since the inside of the apparatus is made a reducing atmosphere so that zinc oxide is not generated as much as possible, reliable removal of zinc at a temperature at which the scrap steel plate itself is not melted can be realized. And in the dezincing apparatus which concerns on this Embodiment, the stick body standingly arranged in the center part of the apparatus functions as a discharge path of zinc vapor | steam, and heats a scrap steel plate from the center of an apparatus. That is, by heating from the outside of the induction heating container 50 by the induction heating coils 60 and 61 (direction A in FIG. 4) and heating from the inside of the apparatus by the hollow pipe 70 (direction B in FIG. 4), the vicinity of the central portion of the container Since the heat can be distributed to the scrap steel plate 41 put into the, the zinc can be surely removed. In particular, by disposing the hollow pipe 70 in the central portion of the container that tends to become low temperature, the scrap steel plate does not stay in the central portion, and the scrap steel plate is heated by heating from the hollow pipe. Rapid temperature rise and soaking can be realized. In addition, since the zinc pipe does not adhere to the inside of the pipe by heating the hollow pipe serving as the zinc vapor discharge path, a dezincing apparatus with excellent maintenance cost can be realized. Furthermore, not only the temperature near the outer periphery of the container, but also the temperature at the center of the container can be measured using a pipe standing at the center of the container, so that the temperature inside the container can be controlled.

  As described above, the dezincing apparatus and the dezincing method according to the present invention have been described based on the embodiments, but the present invention is not limited thereto, and the object of the present invention can be achieved and departs from the gist of the invention. Various design changes can be made within the range not to be included, and these are all included in the scope of the present invention.

  For example, in the above embodiment, one hollow pipe is erected at the center of the container. However, if it is inside the container, it may not be at the center, and a plurality of pipes may be erected.

  Further, in the above embodiment, the hollow pipe is made of alloy steel, but is not limited to alloy steel as long as it is induction-heated, and iron, carbon steel, silicon carbide, Carbon or the like may be used.

  Furthermore, a pipe that is not hollow with a slit formed is erected to achieve only rapid temperature rise and soaking in the container, and zinc vapor etc. in the container is provided with an opening at the top of the container, from there It is also possible to adopt a configuration for exhausting.

  The dezincing apparatus according to the present invention is suitable as a zinc removing apparatus for scrap steel sheets plated with zinc.

DESCRIPTION OF SYMBOLS 1, 2 Dezincification apparatus 10,50 Induction heating container 11 Container lid 12 Tilt mechanism 20,60,61 Induction heating coil 30,70 Hollow pipe 31,71,72,73 Slit 32 Outer pipe 33 Inner pipe 41 Scrap steel plate
42 Carbon-containing material 51 Preheating tank 52 1st heating tank 53 2nd heating tank 54 Adjustment tank 55 Discharge part 56 Ventilation adjustment valve 57 Insulation heat insulating material

Claims (14)

A heating container having an inlet for charging a galvanized steel sheet;
A heating coil wound around the outer periphery of the heating vessel and connected to a heating power source;
A dezincing apparatus comprising: a rod body standing inside the heating container. The dezincing apparatus according to claim 1, wherein the rod body is a material having affinity for induction heating. The rod body is hollow and has a drilling portion that communicates with the inside of the rod body,
The dezincing device further includes:
3. The dezincing apparatus according to claim 1, further comprising an exhaust unit that discharges the gas in the container to the outside through the hollow rod body from the hole-cut portion. A plurality of the heating coils;
The dezincing apparatus according to any one of claims 1 to 3, wherein each heating coil is heated at a different temperature. The dezincing apparatus according to claim 4, wherein among the plurality of heating coils, the heating coil located below is heated at a higher temperature. A plurality of the heating coils;
The dezincing apparatus according to any one of claims 1 to 5, wherein each heating coil is energized at a different frequency. A plurality of the drilling portions are formed,
The dezincing apparatus according to claim 3, wherein the diameter or / and the number of the hole drilling portions are different from the upper portion to the lower portion of the rod body. The dezincification device according to any one of claims 1 to 7, wherein a plurality of the rods are provided upright inside the heating container. The deroding apparatus according to any one of claims 1 to 8, wherein the rod body is erected at the center of the heating container. The dezincing device further includes:
The dezincing apparatus according to any one of claims 1 to 9, further comprising a discharging unit that discharges the steel plate from which zinc has been removed to the outside of the apparatus by a predetermined amount below the heating container. 11. The dezincing apparatus according to claim 1, wherein the heating container is a metal container, and an inner wall in contact with the galvanized steel sheet is used as an insulating heat insulating material. A dezincing method for removing zinc by evaporating and removing zinc by heating a galvanized steel sheet,
Injecting a galvanized steel sheet and a carbon-containing material into a heating container having an inlet for charging a galvanized steel sheet,
By induction heating of a galvanized steel sheet by a heating coil wound around the outer periphery of the heating container and connected to a heating power source, and by setting up a hollow bar inside the heating container, the heat generated by the bar By heating, the zinc in the galvanized steel sheet is evaporated and removed,
By reacting the charged carbon-containing material with oxygen in the container to generate carbon monoxide gas, the inside of the container is reduced to suppress oxidation of zinc.
A method of dezincing, wherein the evaporated zinc and the generated carbon monoxide gas are discharged to the outside through a hole formed in the rod through the inside of a hollow rod. . The dezincification method according to claim 12, wherein a gas for adjusting a reducing atmosphere is vented into the heating container. The dezincification method according to claim 12 or 13, wherein the rod body is ventilated in a direction in which the evaporated zinc and the generated carbon monoxide gas are discharged to the outside.