JP2008082640A - Valuable metal recovering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valuable metal recovering device for recovering high quality of valuable metals in a well efficient manner. <P>SOLUTION: The valuable metal recovering device 1 is provided for recovering the valuable metals which treated objects contain. It comprises a device body 10 having a combustion chamber 13, a combustion burner 20 for supplying heated gas to the combustion chamber 13, a flue 30 for discharging combustion gas produced in the combustion chamber 13 to the outside, and a heating container 15 arranged in the combustion chamber 13 for storing the treated objects. The bottomed heating container 15 has a closeable opening 15a in the upper part and a communication part 153 formed to communicate with the upper part of the combustion chamber 13. A charging device 42 continuously charges the treated objects into the heating container 15 via the opening 15a, and an agitation device 44 stirs melt produced in the heating container 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a valuable metal recovery apparatus for recovering a valuable metal contained in an object to be processed such as waste.

  With the recent increase in industrial waste and the like, it is required to collect valuable metals such as precious metals, copper, and aluminum with high quality and high yield. As an apparatus that can efficiently recover valuable metals contained in waste, for example, a valuable metal recovery apparatus disclosed in Patent Document 1 is known.

As shown in FIG. 4, the valuable metal recovery device 50 includes an apparatus main body 52 having a combustion chamber 51, a combustion burner 53 that supplies heated gas to the combustion chamber 51, and combustion gas generated in the combustion chamber 51 from the outside. And a heating container 54 accommodated in the combustion chamber 51. The heating container 54 has an opening that can be freely opened and closed by a lid body 55, and includes a communication portion 56 that communicates with the upper portion of the combustion chamber 51 with the lid body 55 closed.
International Publication No. 2006/035570 Pamphlet

  Since the valuable metal recovery device 50 described above can burn the waste in the heating container 54 in a reducing atmosphere, it is possible to suppress oxidation of the molten metal and recover the valuable metal efficiently. However, in the case of waste having a relatively large specific surface area such as aluminum chips and aluminum beverage cans, even if such valuable metal recovery device 50 is used, it is oxidized during heat treatment to form oxide slag. In addition, there is a possibility that inclusions, mainly oxides, are mixed in the melt, so that there is room for further improvement in terms of recovering high-quality aluminum with high yield and high efficiency.

  Then, this invention aims at provision of the valuable metal collection | recovery apparatus which can collect | recover high quality valuable metals efficiently.

  The object of the present invention is a valuable metal recovery device for recovering a valuable metal contained in an object to be processed, the device main body having a combustion chamber, a combustion burner for supplying heated gas to the combustion chamber, A flue for exhausting combustion gas generated in the combustion chamber to the outside, and a heating container that is disposed in the combustion chamber and accommodates an object to be processed, the heating container having a bottom and an opening that can be sealed at the top And a communication portion that communicates with the upper portion of the combustion chamber is formed, and a charging device that continuously puts an object to be processed into the heating container through the opening, and a molten metal generated in the heating container This is achieved by a valuable metal recovery device further provided with a stirring device for stirring.

  In this valuable metal recovery device, it is preferable that the stirring device is provided with stirring blades that are immersed in the molten metal and generate a vortex in the molten metal by rotation, and the charging device drops the workpiece into the vortex. It is preferable to arrange | position.

  In addition, the heating container includes a discharge channel whose lower part communicates with the outside of the apparatus main body through the side wall of the combustion chamber, and discharges the molten metal through a molten metal discharge port formed at the tip of the discharge channel. In this case, the molten metal discharge port is preferably formed above the stirring blade.

  The discharge channel may include an upper guide portion that is led out from the side wall of the container body and extends upward while adjoining the side wall. In this case, the molten metal discharge port is formed at the tip of the upper guide portion. May be.

  Moreover, the said discharge flow path can be provided below the said molten metal discharge port, and can be provided with the maintenance port connected to the bottom part vicinity of the said heating container.

  In the valuable metal recovery apparatus including these discharge flow paths, the heating container can be configured to include a graphite crucible in which the discharge flow paths are integrated.

  Further, the heating container can include a cylindrical preheating tower that protrudes above the combustion chamber and seals the opening. In this case, the charging device can be provided in the preheating tower.

  The preheating tower is preferably arranged so as to be movable along the upper surface of the apparatus main body. In this case, the stirring blades are arranged so as not to interfere with the heating container when moving the preheating tower. It is preferable that it can be saved.

  In each of the valuable metal recovery devices described above, the input device can include a screw conveyor that conveys the workpiece.

  Further, in each of the valuable metal recovery devices described above, the combustion chamber includes a first combustion chamber that houses the heating container and a second combustion chamber that surrounds the first combustion chamber by disposing a partition wall therein. It can be set as the structure provided. In this case, the heating container communicates with the second combustion chamber via the communication portion, and the combustion burner is disposed at least in the first combustion chamber, The generated combustion gas is discharged to the second combustion chamber through a combustion gas discharge unit, and the combustion gas generated in the second combustion chamber is discharged to the outside through the flue. can do.

  According to the valuable metal recovery device of the present invention, high-quality valuable metals can be efficiently recovered.

  Hereinafter, actual forms of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a valuable metal recovery apparatus according to an embodiment of the present invention.

  As shown in FIG. 1, the valuable metal recovery apparatus 1 includes an apparatus main body 10, and a combustion burner 20 and a flue 30 attached to the apparatus main body 10.

  The apparatus main body 10 is configured by lining a refractory material 12 on an iron casing 11, and a space surrounded by the refractory material 12 is a combustion chamber 13. The combustion chamber 13 has an exhaust port 131 formed in the lower portion thereof, and the flue 30 is connected to the exhaust port 131.

  A support base 14 is installed on the floor surface of the combustion chamber 13, and a heating container 15 is placed on the support base 14. An air supply port 132 for introducing combustion air from the outside is formed on the side wall of the combustion chamber 13. In the present embodiment, the air supply ports 132 are formed at three substantially equal intervals along the circumferential direction with respect to the combustion chamber 13 having a circular shape in plan view, and are formed in three upper and lower stages at each location. The flow rate of air introduced from each air supply port 132 can be individually controlled by adjusting the opening degree of a valve 132 a installed in a pipe connected to the air supply port 132. In this embodiment, the introduction direction of the combustion air from the air supply port 132 is substantially coincident with the radial direction of the combustion chamber 13. However, in order to facilitate the generation of a swirling flow inside the combustion chamber 13, the combustion chamber The air supply port 132 may be formed so that air is introduced along 13 tangential directions.

  The air introduced from the air supply port 132 is not limited to that at room temperature. For example, air heated in advance by heat exchange with the combustion gas exhausted through the exhaust port 131 or other waste heat is introduced. May be. In addition, the formation position and the number of the air supply ports 132 are not limited to the present embodiment, and can be set as appropriate depending on the necessary air introduction amount. Furthermore, when sufficient air can be introduced from the combustion burner 20 described later, the air supply port 132 is not necessarily provided.

  The support base 14 is formed in a cylindrical shape, has a ventilation portion 141 on a side wall, and supports the heating container 15 by having an end surface abutting against the bottom surface of the heating container 15. In the present embodiment, the ventilation portion 141 is composed of four groove portions formed at equal intervals on the upper and lower ends of the support base 14, respectively.

  The heating container 15 has a bottom and has an opening 15a at the top, and is preferably made of a material having good thermal conductivity. In this embodiment, the main part is formed by a container body 151 made of a graphite crucible. It is configured. Graphite crucibles are widely used in crucible furnaces for melting non-ferrous metals, mainly composed of scaly graphite and silicon carbide, have high thermal conductivity, and have excellent oxidation resistance, heat resistance and thermal shock resistance. Excellent durability over a wide temperature range from low to high. One or a plurality of grooves are formed in the upper part of the container main body 151, and the upper end of the container main body 151 is in contact with the lower surface of the disk-shaped holding body 152 via a cushion material (not shown) such as ceramic fiber. By contacting, the groove functions as the communication portion 153. The holding body 152 is detachably fixed to the upper surface of the apparatus main body 10, and the upper end surface of the portion protruding upward is a horizontal plane.

  The size and number of the communication portions 153 are not particularly limited, but are preferably as small as possible so that dust, ash, and the like generated in the heating container 15 are not discharged, and the number is preferably the minimum necessary. Further, by providing a filter in the communication portion 153, discharge of dust, ash, and the like may be reliably prevented. Examples of the filter include bulk, felt, sheet, and mesh breathable members made of ceramic fibers. Further, a baffle plate or the like may be attached as necessary near the periphery of the communication portion 153 so that dust ash and the like in the container main body 151 are not scattered by the flow of combustion gas generated in the combustion chamber 13.

  The communication part 153 is preferably formed so as to communicate with the upper part of the combustion chamber, but the shape does not necessarily need to be a groove as in this embodiment. For example, a through hole formed in the side wall of the heating container 15 can be used as the communication portion 153. Further, a protrusion may be provided on the lower surface of the holding body 152, and a gap between the protrusions formed by the protrusion coming into contact with the upper end surface of the container main body 151 may be used as the communication portion 153. In addition, a gap formed between the upper end surface of the container main body 151 and the lower surface of the holding body 152 may be used as the communication portion 153.

  The combustion burner 20 has a known configuration including a pilot burner that performs preliminary combustion and a main burner that performs main combustion. The combustion burner 20 supplies fuel and combustion air supplied through a fuel pipe 21 and a combustion air supply pipe 22, respectively. By appropriately adjusting the flow rate (air ratio), the combustion load and the combustion temperature can be controlled. The combustion burner 20 is provided at a lower position than the communication portion 153 in the upper part of the combustion chamber 13, and the generated combustion gas is discharged from the exhaust port 131 while swirling around the heating container 15. The heating container 15 is disposed in the tangential direction and slightly downward from the horizontal direction. The arrangement of the combustion burner 20 and the exhaust port 131 is not necessarily limited to that of the present embodiment, but the combustion gas supplied from the combustion burner 20 to the combustion chamber 13 is sufficiently stirred in the combustion chamber 13 and the exhaust port. It is preferable that the arrangement be such that a sufficient combustion time until it is discharged from 131 can be secured. In addition, a stirring plate or the like may be provided inside the combustion chamber 13 as necessary to promote stirring and mixing of the combustion gas.

  The flue 30 is formed such that a pipe extending horizontally from the exhaust port 131 is bent and extends vertically upward, and a diameter-expanded portion 31 having an enlarged cross-sectional area is formed in a part of the flue 30. ing. A second auxiliary capable of supplying combustion air from a pressurized air supply source (not shown) such as a blower between the exhaust port 131 and the enlarged diameter portion 31 (that is, upstream of the enlarged diameter portion 31). An air supply pipe 32 is provided. One or a plurality of air supply ports 321 are formed at the tip of the second auxiliary air supply pipe 32, and by adjusting the opening of the control valve 322 interposed in the middle of the second auxiliary air supply pipe 32, Combustion air can be supplied to the flue 30 at a desired flow rate. A sealed opening / closing door 301 for cleaning is provided at the bent portion of the flue 30.

  A plurality of baffle plates 311 are arranged in the enlarged diameter portion 31 along the vertical direction. Combustion gas introduced from the exhaust port 131 and combustion air introduced from the second auxiliary air supply pipe 32. Are sufficiently mixed and stirred inside the enlarged diameter portion 31 and the residence time is secured.

  The heating container 15 includes a preheating tower 40 having a cylindrical tower body 41. The preheating tower 40 includes a roller 401 at a lower portion, and is movable on a rail 402 disposed along the upper surface of the apparatus main body 10 in the penetrating direction of the drawing. The lower end of the tower main body 41 can be tightly fixed to the upper end of the holding body 152 by a fixing means (not shown) in a state where the lower end is moved right above the holding body 152. Thereby, the preheating tower 40 seals the opening 15a of the heating container 15 in a state of protruding upward from the combustion chamber 13.

  The preheating tower 40 includes a charging device 42 for charging waste containing valuable metals such as aluminum chips into the heating container 15, a stirring device 44 for stirring the metal melted in the heating container 15, and the heating container 15. And a heat-resistant camera 46 for observing the internal combustion state.

  The charging device 42 includes a casing 421 provided so as to extend in a direction (horizontal direction) orthogonal to the side wall of the tower main body 41. The casing 421 includes a hopper 422 into which waste is charged and a screw conveyor 423 extending horizontally toward the center of the tower main body 41, and an open / close lid 422 a is attached to the hopper 422. The screw conveyor 423 has a spiral screw blade 423 a on the outer peripheral surface, and rotates by the operation of the electric motor 424, so that an object to be processed such as waste thrown in from the hopper 422 is directed toward the tower body 41. Carry to push. A waste discharge port 425 is formed at the front end of the casing 421 so as to open at a substantially intermediate position between the inner peripheral surface of the tower main body 41 and the central axis, and the conveyed waste is heated from the waste discharge port 425. It falls into the container 15. The rotation speed of the electric motor 424 can be adjusted, and the supply amount when the waste is continuously supplied into the heating container 15 can be controlled. In addition, a cooling water jacket 426 is provided around the casing 422, and waste in the casing 422 being conveyed can be cooled.

  In the stirring device 44, a stirring blade 442 is fixed to a tip end of a shaft 441 made of a heat-resistant material such as stainless steel by screwing or fitting, and a base end side of the shaft 441 is formed on an upper portion of the preheating tower 40. It protrudes upward through the through hole 40 a and is connected to the electric motor 443. The stirring blade 442 can be rotated horizontally at the center of the lower part in the container main body 151 by transmitting the driving force via the shaft 441 by the operation of the electric motor 443. The shaft 441 is separable at the flange portion 441a, and a sealed fiber or the like is interposed between the shaft 441 and the through hole 40a, so that the airtight state is maintained. The shaft 441 can advance and retreat in the vertical direction, and the stirring blade 442 can be retracted upward so as not to interfere with the heating container 15 when the preheating tower 40 is moved along the rail 402.

  In this embodiment, propeller blades are used as the shape of the stirring blades 442. By causing a vortex to flow in the molten metal stored in the container main body 151, the waste that has fallen on the molten metal surface is quickly taken into the molten metal. However, it is not particularly limited as long as it has a blade shape that produces such an action. For example, a screw blade, a turbine blade, an anchor blade, a paddle blade, or the like may be used. In the present embodiment, the number of the stirring blades 442 is four, but is not particularly limited, and may be two or three, for example. Further, the stirring blades 442 may be provided in a plurality of stages along the axial direction of the shaft 441, which is particularly effective when the viscosity of the molten metal is high.

  The heat-resistant camera 46 can be a CCD camera or the like, and is arranged so as to image the inside of the heating container 15 to check the remaining amount of waste in the heating container 15 and the state of dissolution / gas generation. can do.

  A discharge channel 154 that is connected to the outside of the apparatus main body 10 through the side wall of the combustion chamber 13 and includes a pipe for discharging the molten metal to the outside is connected to the lower portion of the container main body 151. The discharge channel 154 includes a horizontal portion 155 that extends in the horizontal direction and an upper guide portion 156 that branches from the horizontal portion 155 and guides the molten metal upward. A maintenance port 155a and a molten metal discharge port 156a are formed at the ends of the horizontal portion 155 and the upper guide portion 156, respectively, and the molten metal is discharged to the outside through the hot water discharge pipes 155b and 156b formed on the side wall of the apparatus body 10. can do. The hot water outlet pipes 155b and 156b are closed by heat insulating lids 155c and 156c, respectively, and during the heat treatment, the maintenance port 155a of the horizontal portion 155 is sealed with a tap 155d and the lid corresponding to the upper guide portion 156 is used. By opening the body 156c, the molten metal can be continuously discharged from the hot water discharge pipe 156b. The molten metal discharge port 156 a is formed above the stirring blade 442 in a state where the stirring blade 442 is disposed at the stirring position in the heating container 15. Further, the tap 155d is opened during maintenance of the heating container 15 or the like.

  Each air supply port 132 of the combustion chamber 13 and the combustion air supply pipe 22 of the combustion burner 20 are each connected to a pressurized air supply source such as factory air or a blower. These may be individually connected to a plurality of pressurized air supply sources, or may be branched from the same pressurized air supply source.

  Next, a method for recovering valuable metals from waste using the valuable metal recovery apparatus 1 configured as described above will be described. The valuable metal recovery apparatus 1 according to the present embodiment includes a chip and shredded waste containing combustible waste such as oil, plastic, organic paint, rubber, cloth, paper, and wood (for example, aluminum or copper with oil). From waste with a relatively large specific surface area due to its fineness or thinness, such as aluminum chips, sash scraps with plastic, cans, and metal scrap) It is suitable for recovering valuable metals such as tin and precious metals with a high yield.

  First, the stirring blade 442 is retracted upward and the tower main body 41 is moved, so that the upper portion of the container main body 151 is opened, and an ingot made of the same material as the recovered valuable metal is accommodated in the container main body 151. Then, the tower main body 41 is moved directly above the container main body 151 and sealed, and high temperature combustion gas is supplied from the combustion burner 20 to the combustion chamber 13, thereby melting the ingot in the container main body 151. The temperature of the combustion chamber may be appropriately set in consideration of the melting temperature of the valuable metal to be recovered. For example, when the metal waste is an aluminum material such as an aluminum beverage can or aluminum chips, the temperature of the combustion chamber 13 Can be set to about 900 ° C. While the temperature of the combustion chamber 13 is monitored by a temperature sensor (not shown) or the like, combustion is performed by on / off control of the main burner and the pilot burner in the combustion burner 20 and adjustment of the opening degree of the valve 132a of the intake port 132. The desired temperature can be set by adjusting the amount and air ratio.

  After confirming that the ingot is melted and the main hot water is stored with the heat-resistant camera 46, the stirring blade 442 is lowered and immersed in the molten metal to operate the stirring device 44, and the stirring blade 442 is rotated. The molten metal in the container main body 151 is swirled by the rotation of the stirring blade 442 to generate a vortex. As a result, the liquid level L of the molten metal is raised at the portion in contact with the inner surface of the container main body 151 as shown in the figure, so that the stored molten metal is guided to the hot water discharge pipe 156b through the upper guide portion 156 of the discharge channel 154. The And the molten metal can be supplied outside by removing the lid 156c. In the present embodiment, since the molten metal discharge port 156a of the discharge channel 154 is formed above the stirring blade 442, the supply of the molten metal is stopped when the charging device 42 and the stirring device 44 are stopped. Therefore, the supply and stop of the molten metal made of valuable metals can be linked to the operating states of the charging device 42 and the stirring device 44. In addition, since the inside of the discharge channel 154 is always filled with the molten metal, it is possible to prevent unburned gas generated in the heating container 15 from being discharged from the molten metal discharge port 156a to the outside. it can.

  Then, along with the start of the operation of the stirring device 44, the screw conveyor 423 of the input device 42 is operated, and waste is input from the hopper 422. The thrown-in waste is conveyed toward the tower main body 41 by the screw conveyor 423, and falls into the container main body 151 through the opening 15a. Since the opening 15a is sealed by the preheating tower 40, the inside of the container body 151 becomes oxygen-free or low-oxygen state with combustion of the waste that has fallen into the container body 151, and combustion is performed in a reducing atmosphere. . In this embodiment, since the ventilation part 141 is formed in the support base 14 which supports the container main body 151, combustion gas contacts not only the side wall but the bottom part of the container main body 151, and the whole heating container 15 is made efficient. Can be heated well. By reducing and burning the waste by indirect heating using the heat transfer of the heating container 15, oxidation of valuable metals contained in the waste can be suppressed. If necessary, a material that promotes carbonization such as coconut or plastic may be added to the container body 151 to enhance the reducing atmosphere. Thus, by melting metal waste in a reducing atmosphere, oxidation of the molten metal can be prevented and recovery as a valuable metal can be easily performed.

  The pulverized waste that has fallen into the container main body 151 is quickly brought into the molten metal by the vortex generated by the rotation of the stirring blade 442 and is in a state of being submerged. As a result, the valuable metal in the waste melts without coming into contact with the outside air, so that oxidation of the valuable metal can be prevented more reliably. Combustible waste such as oil, paint, and plastic other than valuable metals are released in the form of gas by thermal decomposition. The charging device 42 is preferably arranged so as to disperse and drop the processing object in the vortex generated by the rotation of the stirring blade 442 so that the processing object can enter the molten metal as quickly as possible. In the present embodiment, the waste discharge port 425 is formed at a substantially intermediate position between the inner peripheral surface of the tower main body 41 and the central axis, and the object to be treated can be distributed substantially uniformly on the molten metal surface in the vortex. it can.

  Further, by providing a ring-shaped guide plate on the inner peripheral surface of the container main body 151, an object to be processed that is deposited on the surface of the molten metal and moves radially outward by the centrifugal force of the vortex is melted by the lower surface of the guide plate. You may comprise so that it may sneak quickly inside.

  The inside of the combustion chamber 13 has a negative pressure due to the high-temperature combustion gas rising up the flue 30 through the exhaust port 131, so that water vapor generated from waste due to heating of the heating container 15, organic substances, etc. The unburned gas is led out from the communication part 153 to the combustion chamber 13. The unburned gas is burned in the combustion chamber 13 to become combustion gas, and is discharged from the exhaust port 131 together with the combustion gas of the combustion burner 20. In the present embodiment, the combustion burner 20 is disposed above the exhaust port 131, and the combustion gas injected from the combustion burner 20 swirls along the wall surface of the combustion chamber 13, so that unburned gas is removed from the combustion chamber. In addition to being able to sufficiently stir in 13, it is possible to ensure a sufficient combustion time of unburned gas in the combustion chamber 13. As a result, complete combustion of the unburned gas in the combustion chamber 13 can be promoted, the exhaust can be maintained in a clean state, and discharge of smoke, odor, dust ash, and the like can be prevented.

  Further, in the present embodiment, the combustion air can be introduced into the combustion chamber 13 from the air supply port 132. Therefore, when the amount of air introduced from the combustion burner 20 into the combustion chamber 13 is insufficient, this shortage To ensure complete combustion in the combustion chamber 13.

  The temperature of the combustion gas supplied from the combustion burner 20 is preferably 800 ° C. or higher and more preferably 850 ° C. or higher from the viewpoint of promoting complete combustion of unburned gas and dioxins. The upper limit of the combustion temperature is determined in consideration of the heat resistance of the material used. For example, when a graphite crucible is used as in this embodiment, high temperature use of about 1500 ° C. is also possible.

  When the heating container 15 is sufficiently heated and the unburned gas is continuously supplied from the heating container 15 to the combustion chamber 13, the combustion amount of the combustion burner 20 can be reduced. For example, the main burner of the combustion burner 20 may be stopped and only the pilot burner may be burned, or the supply of fuel to the combustion burner 20 is stopped and only air at normal temperature is supplied from the combustion burner 20. You may do it. At this time, the opening degree of the valve 132a of the air supply port 132 can be adjusted to control the inside of the combustion chamber 13 to have an optimum air-fuel ratio. In particular, in the case of a waste containing a material having a high calorific value such as a PET resin or a vinyl chloride resin, a large amount of self-combustion heat can be obtained. The high-temperature exhaust gas discharged from 131 can be effectively used for boilers and drying. As described above, the valuable metal recovery device of the present embodiment can not only efficiently recover valuable metals from waste, but also can effectively recover the combustion heat of combustible waste as a resource, and can be applied by creating thermal energy. It is.

  The gas introduced into the combustion chamber 13 from the air supply port 132 may be other combustion-supporting gas such as oxygen in addition to air, and thereby complete combustion in the combustion chamber 13 can be promoted.

  The valuable metal recovery device 1 according to the present embodiment reliably prevents oxidation of the molten metal by quickly letting the continuously charged waste into the molten metal in the heating container 15 capable of reducing combustion. This is characterized in that valuable metals can be recovered. Therefore, in order to obtain a large processing capacity, it is preferable to entrap as much waste as possible in the molten metal in a short time without depositing it on the molten metal surface. For this purpose, it is preferable to increase the swirl speed of the molten metal by the rotation of the stirring blade 442 and to increase the inner diameter of the container main body 151. For example, when about 100 to 3000 kg / h is required as the maximum waste processing capacity, a container main body 151 having an inner diameter of about 400 to 1200 mm is used, and the swirling speed of the molten metal is about 3 to 3 on the outermost periphery. What is necessary is just to set the rotational speed of the stirring blade 442 so that it may become 30 m / sec. In order to realize such rotation of the stirring blade 442, it is preferable to use a variable rotary stirring propeller device that can rotate at a rotational speed of about 100 to 500 rpm. Increasing the inner diameter of the container main body 151 is also preferable from the viewpoint of enabling a stable continuous melting process because the amount of molten metal stored is increased and the molten metal temperature is easily maintained.

  As mentioned above, although one Embodiment of this invention was explained in full detail, the specific aspect of this invention is not limited to the said embodiment. The valuable metal recovery apparatus 1 of the present embodiment melts the waste thrown into the heating container 15 into the molten metal. In order to recover high-quality valuable metal at a high yield, the heating container 15 is used. A structure that can be sufficiently heated is preferable. Therefore, as shown in FIG. 2, by arranging a partition wall 1302 inside the combustion chamber 1301, the combustion chamber 1301 is divided into a first combustion chamber 1303 for housing the heating container 15 and a second combustion chamber 1303 surrounding the first combustion chamber 1303. A double structure including the combustion chamber 1304 may be used. In FIG. 2, the same components as those shown in FIG. 1 are denoted by the same reference numerals.

  In the valuable metal recovery apparatus 101 shown in FIG. 2, a gap is formed between the upper end of the partition wall 1302 and the lower surface of the holding body 152. A ring-shaped flange portion 1511 is fixed to the upper end of the container main body 151, and the outer edge portion of the flange portion 1511 extends to the second combustion chamber 1304 via the gap. Thus, a communication portion 1531 that connects the inside of the heating container 15 and the second combustion chamber 1304 is formed between the flange portion 1511 and the holding body 152. The communication portion 1531 directly communicates with the second combustion chamber 1304 without passing through the first combustion chamber 1303, and a ring-shaped filter 1531a is disposed so as to be replaceable.

  A first combustion burner 201 is disposed below the first combustion chamber 1303, and a second combustion burner 202 is disposed above the second combustion chamber 1304. Since the structure of the 1st combustion burner 201 and the 2nd combustion burner 202 is the same as that of the combustion burner 20 shown in FIG. 1, description is abbreviate | omitted. Combustion gas generated in the first combustion chamber 1303 by the first combustion burner 201 enters the second combustion chamber 1304 via a combustion gas discharge portion 1305 formed between the flange portion 1511 and the upper end of the partition wall 1302. Discharged. A plurality of spacers 1306 are disposed along the circumferential direction between the first combustion chamber 1303 and the second combustion chamber 1304, and the interior of the second combustion chamber 1304 is maintained at a predetermined size.

  According to the valuable metal recovery device 101 configured in this way, in the first combustion chamber 1303, the unburned gas generated in the heating container 15 is not supplied, and the combustion does not necessarily have to be completed. The heating efficiency of the container main body 151 by the one combustion burner 201 can be increased, and the molten metal can be maintained at a high temperature. On the other hand, in the second combustion chamber 1304, the unburned gas generated in the heating container 15 merges with the combustion gas generated in the first combustion chamber 1303, and is supplied from the air supply port 132 as necessary. And complete combustion is promoted. Therefore, it is possible to improve the combustion efficiency and achieve clean combustion while maintaining good heating efficiency for the molten metal in the heating container 15. The total volume of the first combustion chamber 1303 and the second combustion chamber 1304 may be substantially the same as the volume of the combustion chamber 13 shown in FIG. 1, and a compact configuration can be maintained. In the configuration including the first combustion chamber 1303 and the second combustion chamber 1304, the second combustion burner 202 disposed in the second combustion chamber 1304 is not necessarily required, and the first combustion burner 201 is provided only in the first combustion chamber 1303. It is also possible to have a configuration comprising

  In the valuable metal recovery apparatus 1 shown in FIG. 1, a plurality of input devices 42 may be provided for the tower body 41. For example, by disposing the plurality of input devices 42 radially from the center of the tower main body 41, it becomes easy to disperse and drop the waste uniformly into the vortex of the container main body 151. Further, instead of providing the charging device 42 on the side wall of the tower main body 41, the processing object may be arranged to fall from the upper part of the tower main body 41.

    To-be-processed objects such as waste to be processed by the valuable metal recovery apparatus 1 of the present embodiment may be pulverized in advance in order to enable smooth transfer by the input apparatus 42. Alternatively, a pulverizer may be connected to the hopper 422 of the charging device 42 so that the object to be processed is pulverized in advance by the pulverizer and then charged into the charging device 42.

    Moreover, in order to promote the grinding | pulverization of the waste in conveyance with the screw conveyor 423, the charging device 42 may arrange | position a fixed blade or a rotary blade in the casing 421 suitably. The specific configuration of the charging device 42 is not limited to that of the present embodiment, as long as an object to be processed such as waste can be dropped into the vortex of the molten metal generated in the heating container 15. Other configurations may be used. For example, it is also possible to use a charging device configured to apply vibration to a collection container containing a chip-like or shredded workpiece and drop it into a heating container via an inclined path or the like.

  Moreover, as the heating container 15 in the valuable metal recovery apparatus 1 shown in FIG. 1, a deformed graphite crucible in which a container main body 151 made of a graphite crucible and a discharge channel 154 made of a heat-resistant material such as a graphite crucible material are integrated. Can be used. As an irregular shaped graphite crucible, as shown in FIG. 3, for example, the upper guide portion 1561 constituting the discharge flow path 1541 integrated with the container main body 151 is not branched from the horizontal portion 155, but the container main body The molten metal may be discharged through a hot water outlet 1562 formed in the middle of the upper guide portion 1561 so as to be derived from the side wall 151 and extend upward while adjoining the side wall. According to this configuration, since the molten metal passing through the upper guide portion 1561 receives heat transfer from the molten metal stored in the container main body 151, the temperature of the molten metal discharged from the outlet pipe 156b can be maintained at a high temperature. .

  In this embodiment, the container body 151 is composed of a graphite crucible. However, when melting a metal waste having a low melting temperature such as zinc or a low melting point aluminum alloy material, the container body 151 is inexpensive and conducts heat. A container body 151 made of an iron container having good properties can also be used. In addition, as the container main body 151, a container made of metal other than refractory ceramics or iron can be used.

It is sectional drawing of the valuable metal collection | recovery apparatus which concerns on one Embodiment of this invention. It is sectional drawing of the valuable metal collection | recovery apparatus which concerns on other embodiment of this invention. It is sectional drawing of the valuable metal collection | recovery apparatus which concerns on other embodiment of this invention. It is sectional drawing of the conventional valuable metal collection | recovery apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valuable metal collection | recovery apparatus 10 Apparatus main body 13 Combustion chamber 15 Heating container 15a Opening 153 Communication part 154 Discharge flow path 155a Maintenance port 156a Molten metal discharge port 20 Combustion burner 30 Flue 40 Preheating tower 42 Charging device 423 Screw conveyor 44 Stirring device 442 Stirring Feather

Claims (10)

A valuable metal recovery device for recovering valuable metals contained in a workpiece,
An apparatus body having a combustion chamber;
A combustion burner for supplying heated gas to the combustion chamber;
A flue for discharging the combustion gas generated in the combustion chamber to the outside;
A heating container disposed in the combustion chamber and containing an object to be processed;
The heating vessel has a bottomed opening that can be sealed at the top, and a communication portion that communicates with the top of the combustion chamber is formed,
An input device for continuously supplying an object to be processed into the heating container through the opening;
A valuable metal recovery apparatus further comprising a stirring device for stirring the molten metal generated in the heating vessel. The stirring device includes a stirring blade that is immersed in the molten metal and generates a vortex in the molten metal by rotation,
The valuable metal recovery apparatus according to claim 1, wherein the charging device is arranged to drop an object to be processed in the vortex. The heating container includes a discharge passage whose lower portion communicates with the outside of the apparatus main body through the side wall of the combustion chamber, and can discharge the molten metal through a molten metal discharge port formed at the tip of the discharge passage. Configured,
The valuable metal recovery apparatus according to claim 2, wherein the molten metal discharge port is formed above the stirring blade. The discharge flow path is led out from the side wall of the container body, and includes an upper guide portion that extends upward while adjoining the side wall,
The valuable metal recovery apparatus according to claim 3, wherein the molten metal discharge port is formed at a tip of the upper guide portion. 5. The valuable metal recovery apparatus according to claim 3, wherein the discharge flow path includes a maintenance port that is formed below the molten metal discharge port and communicates with the vicinity of the bottom of the heating container.
The valuable metal recovery apparatus according to claim 3, wherein the heating container includes a graphite crucible in which the discharge flow path is integrated. The heating container includes a cylindrical preheating tower that protrudes above the combustion chamber and seals the opening.
The valuable metal recovery apparatus according to claim 1, wherein the charging device is provided in the preheating tower. The preheating tower is arranged to be movable along the upper surface of the apparatus main body,
The valuable metal recovery apparatus according to claim 7, wherein the stirring blade can be retracted upward so as not to interfere with the heating container when the preheating tower is moved. The valuable metal recovery apparatus according to any one of claims 1 to 8, wherein the charging device includes a screw conveyor that conveys an object to be processed. The combustion chamber includes a first combustion chamber that houses the heating container by disposing a partition wall therein, and a second combustion chamber that surrounds the first combustion chamber,
The heating vessel is in communication with the second combustion chamber via the communication portion,
The combustion burner is disposed at least in the first combustion chamber;
Combustion gas generated in the first combustion chamber is discharged to the second combustion chamber via a combustion gas discharge unit, and combustion gas generated in the second combustion chamber is discharged to the outside via the flue. The valuable metal recovery apparatus according to claim 1, wherein the valuable metal recovery apparatus is configured to be discharged.

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