JP2011042851A - Dezincification apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dezincification apparatus which can surely remove zinc. <P>SOLUTION: This dezincification apparatus includes: a preheating tank 10 which is provided with an input port for charging a zinc-plated scrap steel sheet and with a preheating chamber 12 for subjecting the charged scrap steel sheet to preliminary heating; a preheat tank 20 which is arranged in the lower part of the preheating tank 10 and is provided with a preheat chamber 22 that makes a heating coil 23 for preheating the preliminary heated scrap steel sheet wind around its outer circumference; a heating tank 30 which is arranged in the lower part of the preheat tank 20 and is provided with a heating chamber 32 that makes a heating coil 33 for fully heating a preheated scrap steel sheet wind around its outer circumference; a residual heat tank 40 which is arranged in the lower part of the heating tank 30 and is provided with a residual heat chamber 41 for staying the fully heated scrap steel sheet therein; dampers 13, 24 and 34 which seal and section each tank and also drop and transfer the scrap steel sheet to the heating chamber which is located in the next lower part; and an exhaust pipe 50 which is connected to the preheat tank 20, the heating tank 30 and the residual heat tank 40. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an induction heating type dezincing apparatus that heats 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 response to such a problem, an induction heating type dezincing apparatus 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, it is difficult to heat the galvanized steel sheet located at the center portion of the heating cylinder, for example, it is difficult to heat at a uniform temperature. There is a possibility that zinc is conveyed to the induction melting furnace in an oxidized state and zinc is mixed into the product. In addition, a large amount of zinc oxide containing zinc oxide is generated on the molten metal surface in the induction melting furnace, the surrounding refractory is melted down, or noro is taken into the refractory, and the ZnO / SiO ₂ mixed oxide becomes the refractory surface. There is also a possibility that the material will rise and stick to the surface, and when the material is charged, the material will be in a suspended state, causing abnormal heating of the material in the lower portion that has been previously charged.

  Then, this invention is made | formed in view of the said subject, and it aims at providing the dezincing apparatus which enables the reliable removal of zinc. Another object of the present invention is to provide a dezincing apparatus that can reliably discharge zinc vapor.

  In order to solve the above problems, a dezincing apparatus according to the present invention includes a first heating chamber for applying heat to a galvanized steel sheet, and a heating in the first heating chamber, which is located below the first heating chamber. A second heating chamber having a space for applying heat at a temperature higher than that of heating in the first heating chamber to the galvanized steel sheet to which is applied, and sealing the first heating chamber and the second heating chamber Opening and closing means for partitioning and moving the galvanized steel sheet from the first heating chamber to the second heating chamber, wound around the outer periphery of the first heating chamber and the second heating chamber, the first heating chamber and the second heating chamber A heating coil for heating the galvanized steel sheet in the heating chamber is provided.

  As a result, the galvanized scrap steel plate can be heated in stages in a plurality of heating chambers, and by stirring each time the heating chambers are dropped and moved, uniform heat can be applied to the scrap steel plates. Thus, a dezincing apparatus that can efficiently and reliably remove zinc is realized.

  Here, the dezincing device is further located above the first heating chamber, and has a charging port for charging a galvanized steel sheet, and the galvanized steel sheet is heated in the first heating chamber. A preheating chamber having a space for applying heat at a lower temperature, and the opening / closing means hermetically partitions the preheating chamber and the first heating chamber, and the first heating from the preheating chamber It is preferable to drop and move the galvanized steel sheet to the chamber.

  Thereby, the scrap steel plate can be stirred and heated evenly by multi-stage heating and dropping.

  Moreover, it is preferable that the said dezincification apparatus is further provided with the preheating chamber which is located under the said 2nd heating chamber and retains the galvanized steel plate with which the heating in the said 2nd heating chamber was given.

  Thereby, the zinc component remaining on the scrap steel plate due to the residual heat generated by the heating a plurality of times can be reliably removed.

  Further, it is preferable that the dezincing device further includes an exhaust pipe connected to the first heating chamber and the second heating chamber. A zinc component collecting filter, an induction fan, and a cooler as necessary are connected to the downstream side of the exhaust pipe, and after exhausting the zinc, the exhaust pipe is exhausted.

  As a result, zinc vapor is sucked and discharged from each sealed heating chamber through the exhaust pipe, so that a zinc removal device that can reliably discharge zinc vapor is realized without leakage of zinc vapor to the outside. The

  As described above, according to the dezincing apparatus according to the present invention, the scrap steel plates are divided into a plurality of heating chambers, and the scrap steel plates are dropped and moved to the respective heating chambers, and the scrap steel plates are stirred in the respective heating chambers. Since the filling position of the steel plate changes, the scrap steel plate can be heated more uniformly, and reliable zinc removal can be realized. In addition, since the opening and closing device that moves the scrap steel plate in a closed manner closes each heating chamber, the zinc vapor can be guided to the exhaust pipe that becomes the discharge path of the zinc vapor without leaking outside. Reliable exhaust is also possible.

It is a figure which shows the outline of a dezincification apparatus. It is a figure which shows the outline of another structure of a dezincification apparatus.

  Hereinafter, a dezincing apparatus 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 heats a galvanized steel sheet to evaporate zinc, and includes a preheating tank 10, a preheating tank 20, a heating tank 30, a residual heat tank 40, and an exhaust pipe 50. Yes.

  The preheating tank 10 is provided with an inlet for charging a scrap steel plate in the upper part, a storage chamber 11 for storing the scrap steel plate charged in the apparatus, and a reserve for preheating the scrap steel plate. A double door type damper 13 is provided as an opening / closing device that partitions the heating chamber 12 and the preheating tank 10 and the preheating tank 20. The preheating in the preheating chamber 12 is heating by the heat of the temperature of 500 degrees C or less transmitted from the preheating tank 20 located in the lower part, The water | moisture content, oil content, etc. which are contained in a scrap steel plate are removed by this heating.

  The preheating tank 20 is a tank having a space for heating the scrap steel plate after being preheated in the preheating chamber 12, and a storage chamber 21 for storing the scrap steel plate fed by opening the damper 13. A preheating chamber 22 for preheating the scrap steel plate, a heating coil 23 wound around the outer periphery of the preheating chamber 22, and a double-spread damper 24 that partitions the preheating tank 20 and the heating tank 30 are provided. . The heating coil 23 is connected to an induction heating power source (not shown), and induction heats the scrap steel plate in the preheating chamber 22 by energization from the induction heating power source. The preheating in the preheating chamber 22 is the first heating by the heating coil 23 at a temperature of 500 to 900 ° C. By this heating, the zinc plating of the scrap steel plate is melted and a part thereof is evaporated and removed as zinc vapor, and the heat is transferred to the preheating chamber 12 located above and used as preheating. . The atmosphere in the preheating tank 20 may be an air atmosphere, but in order to prevent the oxidation of zinc and promote the evaporation of zinc, a reduction containing an inert atmosphere or carbon monoxide into which nitrogen, argon or the like is introduced. The atmosphere should be good.

  The heating tank 30 is a tank having a space for heating the scrap steel plate after preheating is applied in the preheating chamber 22, and a storage chamber 31 for storing the scrap steel plate fed by opening the damper 24; A heating chamber 32 for applying main heating to the scrap steel plate, a heating coil 33 wound around the outer periphery of the heating chamber 32, and a double door damper 34 that partitions the heating tank 30 and the preheating tank 40 are provided. . Similar to the heating coil 22, the heating coil 33 induction heats the scrap steel plate in the heating chamber 32 by energization from an induction heating power source. The main heating in the heating chamber 32 is the second heating by heat at a temperature of 900 to 1100 ° C. by the heating coil 33. The zinc plating of the scrap steel plate that could not be removed in the preheating chamber 22 by this heating is melted and evaporated to be removed as zinc vapor. The atmosphere in the heating tank 30 may be an air atmosphere, but includes an inert atmosphere or carbon monoxide into which nitrogen, argon, or the like is introduced in order to prevent zinc oxidation and promote zinc evaporation. A reducing atmosphere is preferable.

  The residual heat tank 40 is a tank having a space for cooling the scrap steel plate subjected to the main heating in the heating chamber 32 to remove zinc by the residual heat and to prevent the drive unit of the apparatus from being damaged at a high temperature. The scrap steel plate sent by opening the damper 34 is stored, the residual heat chamber 41 for removing the remaining zinc component using the residual heat of the scrap steel plate, and the scrap steel plate from which the zinc has been removed are out of the apparatus. And a discharge portion 42 for discharging.

  The exhaust pipe 50 is a pipe for sucking the inside of the pipe and discharging the zinc vapor to the outside. The exhaust pipe 50 is connected to the preheating tank 20, the heating tank 30, and the residual heat tank 40, and the zinc vapor generated in each of these tanks. Functions as a discharge channel. A zinc component collecting filter, an attracting fan, and a cooler as necessary are connected to the downstream side of the exhaust pipe 50 so that zinc is captured and discharged to the outside.

  The dezincing procedure of the scrap steel plate in the dezincing apparatus 1 configured as described above is as follows.

  The scrap steel plate charged into the preheating tank 10 stays in the storage chamber 11. When the previously introduced scrap steel plate is fed into the preheating tank 20, the scrap steel plate in the storage chamber 11 sequentially falls into the preheating chamber 12. The scrap steel plate that has been preheated in the preheating chamber 12 is freed of moisture, oil, and the like, and is sent to the preheating tank 20 by opening the damper 13. The removed moisture, oil, and the like become steam and the like and are discharged to the outside through the exhaust pipe 50.

  The scrap steel plate sent to the preheating tank 20 stays in the storage chamber 21. Here again, when the previously introduced scrap steel plate moves to the heating tank 30, the scrap steel plate in the storage chamber 21 falls sequentially into the preheating chamber 22. Since the scrap steel plate is agitated by falling and moving, heat is uniformly applied to the indoor scrap steel plate. Zinc is removed from the scrap steel plate preheated in the preheating chamber 22, and the steel plate is fed into the heating tank 30 by opening the damper 24. Zinc removed by preheating in the preheating chamber 22 becomes zinc vapor and is discharged to the outside through the exhaust pipe 50. At this time, since the preheating tank 20 and the preheating tank 10 are hermetically sealed by the damper 13, the zinc vapor is difficult to leak outside.

  Subsequently, the scrap steel plate sent to the heating tank 30 stays in the storage chamber 31. Similarly, when the previously thrown-in scrap steel plate moves to the preheating tank 40, the scrap steel plate in the storage chamber 31 sequentially falls into the heating chamber 32 and is stirred at that time. The scrap steel plate that has not been able to remove the zinc in the preheating chamber 22 by this stirring is also removed by the main heating in the heating chamber 32. The scrap steel plate from which zinc has been removed is sent to the residual heat tank 40 by opening the damper 34, and the removed zinc is discharged through the exhaust pipe 50 as zinc vapor. At this time, the damper 24 seals the heating tank 30 and the preheating tank 20 so that zinc vapor does not leak out.

  When the scrap steel plate is fed into the preheating tank 40, the scrap steel plate stays in the preheating chamber 41, and the remaining zinc component is removed by the residual heat generated by the main heating in the heating chamber 32. The scrap steel plate is agitated by the drop movement to the residual heat tank 40 and the residual heat is uniformly applied, so that the remaining zinc component can be reliably removed as zinc vapor. Since the damper 34 seals the residual heat tank 40 and the heating tank 30, the zinc vapor is discharged from the exhaust pipe 50 and does not leak outside. After staying in the residual heat chamber 41 for a predetermined time, the scrap steel plate from which zinc has been removed is pushed out by a pusher or the like and discharged from the discharge portion 42 to the outside.

  As described above, according to the dezincing apparatus according to the present embodiment, a batch continuous system that heats by dividing a space for heating a scrap steel plate into a plurality of parts can be realized, and thus an apparatus having excellent dezincing efficiency can be realized. . Moreover, since the scrap steel plate is dropped and moved, the scrap steel plate is stirred in each heating space. This stirring effect makes it possible to heat the scrap steel plate uniformly, so that reliable zinc removal can be realized. In addition, since the opening and closing device that moves the scrap steel plate in a sealed manner separates each heating space, zinc vapor is discharged from the exhaust pipe installed on the side without leaking outside, and reliable zinc vapor Exhaust is possible.

  As mentioned above, although the dezincing apparatus based on this invention was demonstrated based on embodiment, this invention is not limited to this, In the range which can achieve the objective of this invention and does not deviate from the summary of invention. Various design changes are possible and all are included within the scope of the present invention.

  For example, in the above-described embodiment, a double door type damper is used as the opening / closing means, but other opening / closing means such as a sliding door may be used as long as each tank is partitioned and sealed.

  Further, the heating coils wound around the outer periphery of the preheating tank and the outer periphery of the heating tank may be connected to different induction heating power sources, or the heating coils connected to one induction heating power source may be connected to both tanks. It is good also as winding around the outer periphery. As shown in the above embodiment, by dividing the heating coil wound around the preheating tank and the heating coil wound around the heating tank, the heating temperature can be adjusted for each tank.

  Furthermore, since preheating uses heat transmitted from the lower preheating tank, as shown in FIG. 2, the preheating tank and the preheating tank are integrated without being hermetically sealed and preheated in the preheating tank. It is good also as the dezincification apparatus 2 of the structure which performs preheating. On the other hand, instead of using the heat from the preheating tank in the preheating, heat may be applied by winding a heating coil around the outer periphery of the preheating chamber.

  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 Preheating tank 11, 11a, 21, 21a, 31 Storage chamber 12, 12a Preheating chamber 13, 24, 34 Damper 20, 20a Preheating tank 22 Preheating chamber 23, 33 Heating coil 30 Heating tank 32 Heating chamber 40 Heating tank 41 Heating chamber 42 Discharge part 50 Exhaust pipe

Claims (4)

A first heating chamber for applying heat to the galvanized steel sheet;
A second heating chamber located below the first heating chamber and having a space for applying heat at a temperature higher than the heating in the first heating chamber to the galvanized steel sheet heated in the first heating chamber When,
The first heating chamber and the second heating chamber are sealed and partitioned, and opening / closing means for dropping and moving the galvanized steel sheet from the first heating chamber to the second heating chamber;
A dezincing device comprising: a heating coil wound around the outer periphery of the first heating chamber and the second heating chamber and heating the galvanized steel sheet in the first heating chamber and the second heating chamber. . The dezincing device further includes:
A space that is located above the first heating chamber, has an inlet for charging a galvanized steel sheet, and applies heat at a temperature lower than the heating in the first heating chamber to the input galvanized steel sheet A preheating chamber having
The said opening / closing means seals and partitions the said preheating chamber and said 1st heating chamber, and makes a galvanized steel plate fall and move from a preheating chamber to a 1st heating chamber. Dezincing equipment. The dezincing device further includes:
The dezincification apparatus according to claim 1 or 2, further comprising a preheating chamber that is located below the second heating chamber and retains the galvanized steel sheet that has been heated in the second heating chamber. The dezincing device further includes:
The dezincification apparatus according to claim 3, further comprising an exhaust pipe connected to at least one of the preheating chamber, the first heating chamber, the second heating chamber, and the preheating chamber.