JP5631169B2 - Valuable metal recovery equipment - Google Patents

Description

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

  With the increase in industrial waste in recent years, it is required to recover valuable metals such as precious metals, copper and aluminum contained in industrial waste 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. 7, the valuable metal recovery apparatus 100 includes an apparatus main body 102 having a combustion chamber 101, a combustion burner 103 for supplying heated gas to the combustion chamber 101, and combustion gas generated in the combustion chamber 101 from the outside. And a heating container 105 capable of storing the waste stored in the combustion chamber 101. The opening of the heating container 105 is covered with a lid 106 so that the opening can be opened and closed. The heating container 105 is provided with a communication portion 107 that communicates with the upper part of the combustion chamber 101 with the lid 106 closed. Yes.

  In the valuable metal recovery apparatus 100 configured as described above, waste in the heating container 105 is heated by supplying high-temperature combustion gas from the combustion burner 103 to the combustion chamber 101. As a result, the melting of the waste in the heating container 105 starts, and unburned gas due to combustible substances (oil, paint, plastic, rubber, cloth, paper, wood, etc.) contained in the waste is discharged from the communication unit 107. It is led out to the combustion chamber 101. The unburned gas is mixed with the combustion gas in the combustion chamber 101 and burned, and is discharged from the flue 104.

  According to the valuable metal recovery apparatus 100, since the upper opening of the heating container 105 is closed by the lid body 106, the inside becomes an oxygen-free state or a low-oxygen state. Burned in. As a result, valuable metals can be efficiently recovered while suppressing the oxidation of the molten metal.

International Publication No. 2006-035570

  However, the unburned gas of the flammable substance in the waste described above is generally difficult to burn. Therefore, when the waste contains a large amount of the flammable substance, the valuable metal recovery device described in Patent Document 1 is used. Even if 100 is used, it is difficult to completely burn the unburned gas, and the unburned gas may be mixed in the exhaust gas discharged from the flue 104. In addition, if the unburned gas remaining in the flue 104 is completely burned and then discharged, the running cost increases. Therefore, there is room for further improvement in terms of making exhaust gas highly efficient and clean.

  The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide a valuable metal recovery device capable of discharging clean exhaust gas with high efficiency.

  The object of the present invention is a valuable metal recovery device for recovering valuable metals contained in an object to be processed, the combustion chamber having a combustion space surrounded by a peripheral wall made of a refractory material and a floor surface, A heating container that is disposed in the combustion chamber and has a bottom and has an opening in the upper portion and accommodates an object to be processed, a first combustion burner that supplies heated gas into the combustion chamber, and a projection that protrudes above the combustion chamber A cylindrical tower that closes the upper opening of the heating vessel, and a gas processing chamber that communicates with the tower through a gas outlet path and into which unburned gas generated when the object to be processed is heated is derived. A second combustion burner for supplying heated gas to the gas processing chamber, a gas introduction path for introducing the combustion gas generated in the gas processing chamber into the combustion chamber, and discharging the combustion gas in the combustion chamber to the outside Valuable metal recovery device with a flue More is achieved.

  In a preferred embodiment of the present invention, the heating vessel is provided with a communication portion that communicates the upper part of the combustion chamber and the inside of the tower.

  In another preferred embodiment of the present invention, the apparatus further comprises a third combustion burner for supplying a heated gas into the tower, wherein the tower is provided at a lower portion of the main body and the main body. And a lower tower having a large inner diameter, and the third combustion burner is provided to introduce a heated gas into the lower tower.

  In another preferred embodiment of the present invention, a cylindrical inner tube is provided in the tower so that a gap is formed between the tower and the inner peripheral surface of the main body of the tower. The third combustion burner is arranged so that the heated gas flows outside the inner tube, and the heated gas supplied by the third combustion burner is placed on the outer peripheral surface of the inner tube. A slit-like opening to be introduced into the inner tube is formed.

  In another preferred embodiment of the present invention, a ring-shaped threshold member is provided in the lower tower, and the third combustion is performed so that heated gas flows outside the threshold member. A burner is disposed, and the threshold member is formed with a communication portion that communicates the inside and outside of the threshold member.

  In a further preferred aspect of the present invention, the second combustion burner is arranged in the vicinity of the gas outlet of the gas outlet path inside the gas processing chamber.

  In a further preferred embodiment of the present invention, at least one of the combustion chamber, the gas processing chamber, and the tower includes an air supply port into which a combustion-supporting gas can be introduced from the outside. It is a feature.

  In a further preferred aspect of the present invention, auxiliary gas supply means for supplying a combustion-supporting gas is attached to the gas lead-out path, and a gas discharge port is attached toward the gas processing chamber. .

  According to the valuable metal recovery apparatus of the present invention, clean exhaust gas can be discharged with high efficiency.

It is a longitudinal section showing a schematic structure of a valuable metal recovery device concerning one embodiment of the present invention. It is a longitudinal cross-sectional view which shows the internal structure of the flue of the valuable metal collection | recovery apparatus which concerns on other embodiment of this invention. It is a longitudinal cross-sectional view which shows schematic structure of the valuable metal collection | recovery apparatus which concerns on other embodiment of this invention. It is a cross-sectional view which shows schematic structure in the tower of the valuable metal collection | recovery apparatus of FIG. It is a longitudinal cross-sectional view which shows schematic structure of the valuable metal collection | recovery apparatus which concerns on other embodiment of this invention. It is a cross-sectional view showing a schematic configuration in the tower of the valuable metal recovery apparatus of FIG. It is sectional drawing of the conventional valuable metal collection | recovery apparatus.

  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 1 according to an embodiment of the present invention. As shown in FIG. 1, the valuable metal recovery device 1 includes a combustion chamber 2 having a combustion space 20 therein, a first combustion burner 3 and a flue 4 attached to the combustion chamber 2, and an upper portion of the combustion chamber 2. A cylindrical tower 5 projecting from the gas processing chamber 7, a gas processing chamber 7 communicating with the tower 5 via a gas outlet passage 6, a second combustion burner 8 attached to the gas processing chamber 7, and a gas processing chamber 8 and a gas introduction path 9 communicating with the combustion chamber 2.

  The combustion chamber 2 is configured by a box-like body having an upper opening in which a refractory material 22 is lined in an iron casing 21. A space surrounded by a peripheral wall 23 and a floor surface 24 made of the refractory material 22 is a combustion space. It is 20. A support base 10 is installed on the floor surface 24 of the combustion chamber 2, and the heating container 11 is placed on the support base 10. A gas exhaust port 25 is formed at an upper position of the peripheral wall 23 of the combustion chamber 2, and the flue 4 is connected to the gas exhaust port 25. The flue 4 is formed such that a pipe extending horizontally from the gas exhaust port 25 is bent and extends vertically upward.

  Further, an air supply port 26 for introducing combustion air from the outside is formed in the peripheral wall 23 of the combustion chamber 2. In the present embodiment, the air supply ports 26 are formed at three substantially equal intervals along the circumferential direction with respect to the combustion chamber 2 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 26 can be individually controlled by adjusting the opening of a valve 26 a installed in a pipe connected to the air supply port 26.

  In addition, in this embodiment, although the formation direction of the air supply port 26 is made to substantially correspond to the radial direction of the combustion chamber 2, in order to make a swirl flow easy to produce inside the combustion chamber 2, the direction of the combustion chamber 2 The air supply port 26 may be formed along the tangential direction. Further, the formation location and the number of the air supply ports 26 are not limited to the present embodiment, and can be set as appropriate depending on the necessary air introduction amount. Further, when sufficient air can be introduced from the first combustion burner 3 into the combustion chamber 2, the air supply port 26 is not necessarily provided.

  The support base 10 is formed in a cylindrical shape having a cavity in the center, and the lower surface thereof contacts the floor surface 24 of the combustion chamber 2, and the upper surface thereof contacts the bottom surface of the heating container 11, thereby supporting the heating container 11. doing. On the upper surface and the lower surface of the support base 10, groove portions 10a extending along the radial direction are respectively recessed at equal angular positions (for example, positions at equal intervals of 90 degrees). Each groove portion 10a functions as a communication portion that communicates the cavity inside the support 10 and the outside of the support 10 so that the high-temperature combustion gas injected from the first combustion burner 3 into the combustion chamber 2 By being introduced into the support base 10 through the groove 10a, the heating container 11 is heated not only from the outer periphery but also from the bottom thereof.

  The heating container 11 has a bottom and an opening 11a at the top, and can accommodate waste therein. The material of the heating container 11 is preferably made of a material having good thermal conductivity. In the present embodiment, the main part is constituted by a container made of a graphite crucible. Graphite crucibles are frequently 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.

  A circumferential space 27 is formed around the heating vessel 11 between the peripheral wall 23 of the combustion chamber 2, and the peripheral space 27 is injected from the first combustion burner 3 disposed below the peripheral wall 23 of the combustion chamber 2. It becomes the rising passage of the combustion gas. Further, an upper lid 12 that is detachably fixed to the upper surface of the combustion chamber 2 is provided above the heating container 11.

  The upper lid 12 is a ring-shaped member whose upper surface central portion protrudes upward, and the upper end surface of the portion protruding upward is a horizontal surface. One or a plurality of grooves are provided in the upper surface of the heating container 11. When the upper surface of the heating container 11 comes into contact with the lower surface of the ring-shaped upper lid 12 via a cushioning material (not shown) such as ceramic fiber, the groove functions as the communication portion 13, and the upper portion of the combustion chamber 2 The inside of the tower 5 to be described later is communicated.

  The size and number of the communication portions 13 are not particularly limited, but are preferably as small as possible so that dust, ash, and the like generated in the heating container 11 are not discharged, and the number is preferably the minimum necessary. Moreover, you may prevent discharge | emission of dust, ash, etc. reliably by providing a filter in the communicating part 13. 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 to the vicinity of the communication portion 13 as necessary so that dust ash or the like in the heating container 15 is not scattered by the flow of combustion gas generated in the combustion chamber 2.

  The shape of the communication part 13 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 11 can be used as the communication portion 13. Alternatively, a protrusion may be provided on the lower surface of the upper lid 12, and a gap formed by the protrusion contacting the upper surface of the heating container 11 may be used as the communication portion 13.

  The first combustion burner 3 and the second combustion burner 8 have a known configuration including a pilot burner that performs preliminary combustion and a main burner that performs main combustion, and includes fuel pipes 30 and 80 and a combustion air supply pipe 31. , 81, the combustion load and the combustion temperature can be controlled by appropriately adjusting the flow rate (air ratio) of the fuel and the combustion air supplied through each of them.

  The first combustion burner 3 is attached to a position below the peripheral wall 23 of the combustion chamber 2, so that the combustion gas is discharged from the gas exhaust port 25 while turning around the heating container 11. It is arranged toward the tangential direction. The arrangement of the first combustion burner 3 and the gas exhaust port 25 is not necessarily limited to that of the present embodiment, but the combustion gas injected from the first combustion burner 3 into the combustion chamber 2 is sufficient in the combustion chamber 2. It is preferable that the arrangement is such that a sufficient combustion time can be secured until the gas is stirred and discharged from the gas exhaust port 25. The details of the second combustion burner 8 will be described later.

  Above the combustion chamber 2, a tower 5 having a cylindrical main body 50 is projected. The lower end of the main body 50 can be tightly fixed to the upper end of the upper lid 12 by a fixing means (not shown), whereby the tower 5 is heated while protruding above the combustion chamber 2. The opening 11a of the container 11 is sealed.

  On the upper part of the main body 50, a loading part 51 whose axis extends obliquely upward is provided. The charging unit 51 is provided with a charging lid 52 for charging waste containing valuable metals such as aluminum chips into the heating container 11, and the charged waste is inclined to the charging unit 51. The main body 50 is guided along the inner peripheral surface and falls into the heating container 11.

  A gas exhaust port 53 is formed in the upper part of the main body 50, and the gas outlet path 6 is connected to the gas exhaust port 53. The gas lead-out path 6 is formed so that a pipe extending horizontally from the gas exhaust port 53 is bent and extends vertically downward, and a gas lead-out port 60 at the tip thereof is provided on the upper surface of the gas processing chamber 7. The tower 5 and the gas processing chamber 7 are communicated with each other by being connected to the air supply port 74. As the heating container 11 is heated, unburned gas such as water vapor and organic substances generated from the waste and rising inside the tower 5 flows into the gas processing chamber 7 from the gas exhaust port 53 through the gas outlet path 6. It can be made to.

  In addition, a circulation fan for circulating unburned gas between the tower 5 and the gas processing chamber 7 is provided in the middle of the gas outlet path 6, and a circulation flow is forcibly generated by the suction force accompanying the rotation. Thus, the unburned gas inside the tower 5 may be led out to the gas processing chamber 7.

  The gas processing chamber 7 is configured by a box-shaped body in which a refractory material 72 is lined on an iron casing 71, and has a processing space 70 inside, and an upper portion thereof is closed by a flat lid 73. It is peeling off. The lid 73 is provided with a gas supply port 74, and the gas outlet path 6 is connected to the gas supply port 74.

  In the lid 73, a gas introduction port 73 a that communicates the inside and outside of the lid 73 is formed in the vicinity of the gas supply port 74. A second combustion burner 8 is attached to the gas inlet 73a, and combustion gas is injected into the gas processing chamber 7 from the second combustion burner 8 disposed facing the processing space 70. The Here, the gas introduction port 73a and the gas supply port 74 communicate with each other via the communication space 75, and when the combustion gas is injected from the second combustion burner 8 into the gas processing chamber 7, the gas to be injected Due to the ejector effect caused by the flow, the unburned gas led out from the tower 5 through the gas lead-out path 6 to the communication space 75 is sucked into the gas processing chamber 7 together with the combustion gas and mixed with the combustion gas in the gas processing chamber 7. As a result, the unburned gas is burned in the gas processing chamber 7.

  Thus, in this embodiment, when combustion gas is injected by the 2nd combustion burner 8, the inside of the communication space 75 will be in a negative pressure state by the ejector effect by injection of combustion gas, Therefore The gas outlet path 6 The unburned gas is sucked into the communication space 75 from the gas supply port 74 and injected into the gas processing chamber 7 together with the combustion gas. Therefore, as a result of the circulation of unburned gas from the upstream side to the downstream side in the gas lead-out path 6, the unburned gas inside the tower 5 is smoothly led out from the gas lead-out path 6 to the gas processing chamber 7. It has become.

  According to the configuration of the present embodiment described above, since a power source for leading the unburned gas inside the tower 5 to the gas processing chamber 7 is not required, the gas processing chamber 7 can be downsized. The running cost can be reduced. The arrangement of the second combustion burner 8 in the gas processing chamber 7 is not necessarily limited to the above-described embodiment, and the gas supply port 74 (the gas introduction path 6 in the gas outlet passage 6) is not limited to the above-described embodiment. If it is arranged in the vicinity of the outlet 60), it can be changed as appropriate.

  An air supply port 76 for introducing combustion air from the outside is formed in the peripheral wall 75 of the gas processing chamber 7. In the present embodiment, the air supply ports 76 are formed at three substantially equal intervals along the circumferential direction with respect to the gas processing chamber 7 having a circular shape in plan view, and are formed in three upper and lower stages at each location. Yes. The flow rate of air introduced from each air supply port 76 can be individually controlled by adjusting the opening degree of a valve 76 a installed in a pipe connected to the air supply port 76. In addition, in this embodiment, although the formation direction of the air supply port 76 is made to substantially correspond to the radial direction of the gas processing chamber 7, in order to make a swirl flow easy to produce inside the gas processing chamber 7, gas processing is performed. The air supply port 76 may be formed along the tangential direction of the chamber 7. Further, the location and number of the air supply ports 76 are not limited to those in the present embodiment, and can be set as appropriate depending on the necessary air introduction amount and the shape of the gas processing chamber 7. Furthermore, when sufficient air can be introduced from the second combustion burner 8 into the gas processing chamber 7, the air supply port 76 is not necessarily provided.

  A gas exhaust port 77 is formed in the lower part of the gas processing chamber 7, and a gas introduction path 9 is connected to the gas exhaust port 77. The gas introduction path 9 is connected to a gas supply port 28 provided at the lower end of the combustion chamber 2, and is generated in the gas processing chamber 7 by connecting the gas processing chamber 7 and the combustion chamber 2. Combustion gas can be introduced into the combustion chamber 2. In addition, in order to circulate the combustion gas between the combustion chamber 2 and the gas processing chamber 7 in the middle of the gas introduction path 9, a circulation device that generates a circulation flow such as a circulation fan is provided to forcibly circulate the circulation flow. The combustion gas in the gas processing chamber 7 may be introduced into the combustion chamber 2 by generating the above.

  Next, a method for heat treating waste using the valuable metal recovery apparatus 1 configured as described above will be specifically described. For example, in the case where wastes containing non-ferrous metals such as aluminum, copper, and zinc are heat-treated with wastes containing combustible wastes such as oil, organic paint, plastic, rubber, cloth, paper, and wood. As shown below, the non-ferrous metal contained in the waste can be melted and recovered as a valuable metal using the heat treatment apparatus 1.

  First, the charging lid 52 of the tower 5 is opened, and the waste accompanying the combustible waste as described above is charged into the heating container 11 from the opening 11a. Next, after closing the charging lid 52, the first combustion burner 3 is operated to supply high-temperature combustion gas from the first combustion burner 3 into the combustion chamber 2. The combustion gas supplied to the inside of the combustion chamber 2 is heated in the heating container 11, rises in the circumferential space 27, and enters the tower 5 from the communication portion 13 at the upper end of the heating container 11. What is necessary is just to set suitably the internal temperature of the combustion chamber 2 heated by the 1st combustion burner 3 in consideration of the melting temperature of the valuable metal to collect | recover, for example, waste is aluminum drink cans, aluminum chips, etc. When such an aluminum material is included, the temperature can be set to about 900 ° C. While the internal temperature of the combustion chamber 2 is monitored by a temperature sensor (not shown) or the like, the on / off control of the main burner and pilot burner in the first combustion burner 3 and the opening adjustment of the valve 26a of the air supply port 26 are adjusted. For example, the combustion amount and the air ratio can be adjusted to set the desired temperature.

  Since the upper opening 11 a is closed by the tower 5, the inside of the heating container 11 is in an oxygen-free state or a low oxygen state. Therefore, when the heating container 11 is heated, valuable metals contained in the waste in the heating container 11 are melted in a reducing atmosphere. In this embodiment, since the ventilation part 10a is formed in the support base 10 which supports the heating container 11, combustion gas contacts not only the side wall but the bottom part of the heating container 11, and the whole heating container 11 is made efficient. Can be heated well. By heating the waste in a reducing atmosphere by indirect heating using the heat transfer of the heating container 11, it is possible to easily recover the valuable metal in a state where oxidation of the valuable metal contained in the waste is suppressed. it can. In addition, you may make it strengthen the reducing atmosphere by throwing into the heating container 11 the material which accelerates | stimulates carbonization, such as a coconut and a plastics, as needed.

  Combustible wastes such as oils, paints, and plastics other than valuable metals are thermally decomposed by heating the heating container 11 and discharged into the heating container 11 in the form of gas. It is mixed with the combustion gas flowing into the tower 5 and burns in the tower 5. On the other hand, most of the gas generated from the waste due to the heating of the heating container 11 is led as unburned gas from the gas exhaust port 53 at the top of the tower 5 to the gas processing chamber 7 via the gas lead-out path 6.

  This unburned gas is burned in the gas processing chamber 7 by being mixed with the combustion gas from the second combustion burner 8 and the combustion air from the air supply port 76 introduced as necessary. It becomes combustion gas. At this time, the uncombusted gas is sucked into the gas processing chamber 7 along with the injection of the combustion gas of the second combustion burner 8 (ejector effect), so that the communication space 75, that is, the downstream side of the gas outlet path 6 is negative. Since the pressure is increased, the unburned gas led out from the tower 5 is smoothly led out to the gas processing chamber 7 through the gas lead-out path 6.

  The temperature of the combustion gas supplied from the second combustion burner 8 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. Further, the gas introduced into the gas processing chamber 7 from the air supply port 76 may be other flammable gas such as oxygen in addition to air, and thereby, the unburned gas in the gas processing chamber 7 is completely removed. Can promote combustion.

  The combustion gas burned in the gas processing chamber 7 is supplied to the combustion chamber 2 from the gas exhaust port 77 through the gas introduction path 9 together with the combustion gas of the second combustion burner 8. The combustion gas introduced into the combustion chamber 2 from the gas processing chamber 7 merges with the combustion gas supplied from the first combustion burner 3 and is effectively used as a heat source for heating the heating container 11, and then from the flue 4. Discharged. Further, a part of the combustion gas rises in the gap 27 while heating the heating container 11, enters the tower 5 from the communicating portion 13 at the upper end of the heating container 11, and unburned gas generated from the waste. It is effectively used as a heat source for burning.

  If the gas introduced from the gas processing chamber 7 into the combustion chamber 2 contains a part of the unburned gas that could not be burned in the gas processing chamber 7, the unburned gas is It is burned by the combustion gas supplied to the combustion chamber 2 by one combustion burner 3. In this way, even if unburned gas is contained in the gas introduced from the gas processing chamber 7 into the combustion chamber 2, combustion can be completed in the combustion chamber 2 and generated from waste. It is possible to promote complete combustion of unburned gas.

  According to the valuable metal recovery apparatus 1 of the present embodiment, unburned gas generated from the waste due to the combustion of the waste is mixed with the combustion gas introduced through the communication portion 13 and burned in the tower 5 ( (Primary combustion), and further mixed with the combustion gas supplied by the second combustion burner 8 in the gas processing chamber 7 and burned (secondary combustion), and in addition, supplied by the first combustion burner 3 in the combustion chamber 2. After being mixed with the generated combustion gas and burned (tertiary combustion), it is discharged from the flue 4. Therefore, in the present embodiment, the combustion time of the unburned gas can be sufficiently ensured in the entire apparatus, and as a result, complete combustion of the unburned gas can be promoted, so that the exhaust discharged from the flue 4 The gas can be reliably maintained in a clean state, and emission of smoke, odor, dust ash and the like can be prevented.

  Further, since the high-temperature combustion gas generated by the combustion of the unburned gas is circulated in the combustion chamber 2 and effectively used for heating the heating container 11, the fuel consumed by the first combustion burner 3 is obtained by thermal recycling. In addition to efficient recovery of valuable metals from waste, the combustion heat of combustible waste can be effectively recovered as a resource.

  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. For example, an air supply port 55 for introducing combustion air as a combustion-supporting gas from the outside may be formed in the peripheral wall 54 of the tower 5. In FIG. 2, the air supply ports 55 are formed at three substantially equal intervals along the circumferential direction with respect to the tower 5 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 55 can be individually controlled by adjusting the opening degree of a valve 55 a installed in a pipe connected to the air supply port 55.

  In addition, the formation direction of the air supply port 55 may be substantially coincident with the radial direction of the tower 5, or in order to easily generate a swirling flow inside the tower 5, it is formed along the tangential direction of the tower 5. Also good. Further, the formation location and the number of the air supply ports 55 are not limited to those in the present embodiment, and can be appropriately set depending on the necessary air introduction amount.

  By supplying combustion air into the tower 5 from the air supply port 55, unburned gas generated from the waste is actively burned in the tower 5 as well as in the gas processing chamber 7 and the combustion chamber 2. Therefore, it is possible to ensure complete combustion of the unburned gas as a whole, and to maintain the exhaust gas from the flue 4 in a clean state, such as smoke, odor, dust ash, etc. Emission can be prevented.

  In addition, as shown in FIG. 2, auxiliary gas supply means 90 for introducing a combustion-supporting gas such as air, preheated air, or oxygen may be provided in the gas outlet path 6. The auxiliary air supply means 90 includes an auxiliary air supply pipe 91 connected to a pressurized air supply source (not shown) such as a blower. A gas discharge port 92 at the tip of the auxiliary air supply pipe 91 is provided in a gas processing chamber. It is directed towards 7. A control valve 93 is interposed in the middle of the auxiliary air supply pipe 91. By adjusting the opening of the control valve 93, the combustion-supporting gas can be supplied into the gas outlet passage 6 at a desired flow rate.

  In this embodiment, by supplying the combustion-supporting gas from the auxiliary supply tank 91 to the gas outlet path 6, the unburned gas passing through the gas outlet path 6 is actively burned toward the gas processing chamber 7. be able to. In addition, the gas discharge port 92 is directed toward the gas processing chamber 7, and the gas flow from the upstream side to the downstream side in the gas outlet path 6 is caused by the supply of the combustion-supporting gas from the auxiliary supply tank 91. As a result, the unburned gas in the gas outlet path 6 is smoothly led out toward the gas processing chamber 7.

  FIG. 3 is a cross-sectional view of a valuable metal recovery apparatus 1 ′ according to another embodiment of the present invention. As shown in FIG. 3, the valuable metal recovery device 1 ′ of the present embodiment also includes a combustion chamber 2 having a combustion space 20 therein, a first combustion burner 3 and a flue 4 attached to the combustion chamber 2, A cylindrical tower 5 protruding above the combustion chamber 2, a gas processing chamber 7 communicating with the tower 5 via the gas outlet path 6, and a second combustion burner 8 attached to the gas processing chamber 7. And a gas introduction path 9 that communicates the gas processing chamber 8 and the combustion chamber 2. In addition, in the valuable metal collection | recovery apparatus 1 'of this embodiment, about the site | part same as the structure of the valuable metal collection | recovery apparatus 1 of above-described embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  In this embodiment, the tower 5 includes a cylindrical main body 50 and a lower tower 56 having an inner diameter (cross-sectional area) larger than that of the main body 50. The lower end of the main body 50 is fixed to the upper end of the lower tower 56 by fixing means (not shown), and the lower end of the lower tower 56 is fixed to the upper surface of the combustion chamber 2 by fixing means (not shown). ing. In the present embodiment, the upper surface of the heating container 11 is a horizontal surface, and is in contact with the lower surface of the lower tower 56 through a cushioning material (not shown) such as a ceramic fiber without any gap.

  Inside the lower tower 56, a third combustion burner 57 is provided. The third combustion burner 57 has a known configuration including a pilot burner that performs preliminary combustion and a main burner that performs main combustion. The third combustion burner 57 supplies fuel and combustion for fuel supplied via a fuel pipe and a combustion air supply pipe, respectively. The combustion load and the combustion temperature can be controlled by appropriately adjusting the air flow rate (air ratio). The third combustion burner 57 is provided in an enlarged space 58 having an enlarged inner diameter outside the main body 50 in the lower tower 56, and the combustion gas is discharged in the tangential direction of the circular lower tower 56. Then, the direction of the gas discharge port 68 is determined so as to turn along the side peripheral surface of the inner wall of the lower tower 56.

  Further, inside the lower tower 56, a ring-shaped portion is formed at a boundary portion between the enlarged space 58 in which the third combustion burner 57 is provided and the internal space 59 continuous with the internal space of the main body 50. A threshold member 61 is provided. A plurality of groove portions 62 extending along the radial direction are formed in the upper and lower surfaces of the threshold member 61, respectively. The threshold member 61 is disposed such that the upper surface and the lower surface thereof are in contact with the upper surface and the lower surface of the inner wall of the lower tower 56, respectively. However, each groove 62 has an internal space 59 inside the threshold member 61 at this time. It functions as a communication portion that communicates with the enlarged diameter space 59 outside the threshold member 61, and high temperature combustion gas injected from the third combustion burner 57 into the enlarged diameter space 59 passes through each groove portion 62 and is formed in the lower tower 56. Is introduced into the internal space 59.

  In FIG. 3, grooves 62 are provided on the upper surface and the lower surface of the threshold member 61, and the internal space 59 and the enlarged space 59 of the lower tower 56 are communicated with each other through the groove 62. For example, a through hole may be formed in the side wall of the threshold member 61, and the internal space 59 and the enlarged space 59 of the lower tower 56 may be communicated with each other through the through hole.

  In the valuable metal recovery apparatus 1 ′ of the present embodiment, the heating container 11 is heated by the first combustion burner 3, whereby the valuable metal contained in the waste in the heating container 11 is melted, but other than the valuable metal. Combustible wastes such as oil, paint, and plastic are thermally decomposed, become gaseous, and are discharged into the heating container 11 and enter the tower 5 as unburned gas. The unburned gas released into the tower 5 first flows into the internal space 59 of the lower tower 56 and the inside of the main body 50 from the diameter-enlarged space 59 of the lower tower 56 through the grooves 62. It is mixed with the combustion gas from and burns. The mixed gas of the combustion gas generated in the tower 5 and the unburned gas that has not been burned out is led out from the gas exhaust port 53 at the top of the tower 5 to the gas processing chamber 7 through the gas lead-out path 6.

  Once introduced into the gas processing chamber 7, the mixed gas is then mixed with the combustion gas from the second combustion burner 8 and the combustion air from the air inlet 76 introduced as necessary. The unburned gas inside is burned and becomes combustion gas. Then, the combustion gas burned in the gas processing chamber 7 and the unburned gas that has not been burned are supplied to the combustion chamber 2 from the gas exhaust port 77 through the gas introduction path 9. The unburned gas in the mixed gas supplied to the combustion chamber 2 is finally mixed with the combustion gas supplied from the first combustion burner 3 and burned. As a result, the unburned gas is completely combusted and is effectively used as a heat source for heating the heating container 11 together with the combustion gas in the mixed gas supplied to the combustion chamber 2 and then discharged from the flue 4.

  According to the valuable metal recovery apparatus 1 ′ of the present embodiment, the unburned gas generated from the waste due to the combustion of the waste is burned by the combustion gas from the third combustion burner 57 in the tower 5 (primary combustion). Furthermore, after being combusted by the combustion gas from the second combustion burner 8 in the gas processing chamber 7 (secondary combustion), and after being combusted by the combustion gas from the first combustion burner 3 in the combustion chamber 2 ( It is discharged from the flue 4 in the tertiary combustion). Therefore, in the present embodiment as well, the combustion time of the unburned gas can be sufficiently secured in the entire apparatus, and as a result, complete combustion of the unburned gas can be promoted, so that the exhaust discharged from the flue 4 The gas can be reliably maintained in a clean state, and emission of smoke, odor, dust ash and the like can be prevented.

  Further, since the high-temperature combustion gas generated by the combustion of the unburned gas is circulated in the combustion chamber 2 and effectively used for heating the heating container 11, the fuel consumed by the first combustion burner 3 is obtained by thermal recycling. In addition to efficient recovery of valuable metals from waste, the combustion heat of combustible waste can be effectively recovered as a resource.

  FIG. 5 shows a cross-sectional view of a modified example of the valuable metal recovery apparatus 1 ′ of FIG. In the valuable metal recovery apparatus 1 ′ shown in FIG. 5, a cylindrical inner tube 63 having both ends opened is provided in the tower 5 in place of the threshold member 61. The inner tube 63 has an outer diameter smaller than the inner diameter of the main body 50 of the tower 5, and a gap 67 is formed around the inner tube 63 with the inner peripheral wall of the main body 50. Yes. A flange portion 64 is formed in the upper portion of the inner tube 63, and is supported in a suspended state in the main body portion 50 of the tower 5 via the flange portion 64. The lower part of the inner tube 63 extends to the lower tower 56.

  A slit-like air supply port 65 is formed on the peripheral surface of the inner tube 63. As shown in FIG. 6, the combustion gas discharged from the third combustion burner 57 flows so as to swirl along the side peripheral surface of the inner wall of the lower tower 56, and a part thereof is the lower opening 66 of the inner tube 63. From the air supply port 65 of the inner cylinder pipe 63 to the inside of the inner cylinder pipe 63, most of which rises in the gap 67 between the inner cylinder pipe 63 and the main body 50. To flow into.

  In this embodiment, unburned gas generated by heating in the heating container 11 is released into the inner tube 63. The unburned gas released into the inner cylinder pipe 63 and the combustion gas from the third combustion burner 57 flowing into the inner cylinder pipe 63 through the air supply ports 65 and the lower openings 66 of the inner cylinder pipe 63 and Mix and burn. The mixed gas of the combustion gas generated in the tower 5 and the unburned gas that has not been burned out is led out from the gas exhaust port 53 at the top of the tower 5 to the gas processing chamber 7 through the gas lead-out path 6.

  Since the subsequent treatment of unburned gas is the same as that in the embodiment of FIG. 3 described above, detailed description thereof is omitted here, but also in this embodiment, it is generated from waste due to combustion of waste. The unburned gas to be burned is combusted by the combustion gas from the third combustion burner 57 in the tower 5 (primary combustion), and further burned by the combustion gas from the second combustion burner 8 in the gas processing chamber 7 (secondary combustion). In addition, after being combusted by the combustion gas from the first combustion burner 3 in the combustion chamber 2 (tertiary combustion), it is discharged from the flue 4. As a result, the complete combustion of the unburned gas can be promoted, so that the exhaust gas discharged from the flue 4 can be reliably maintained in a clean state, and the discharge of smoke, odor, dust ash, etc. can be prevented. Is possible.

  In the valuable metal recovery apparatus 1, 1 ′ shown in FIGS. 1, 2, 3, and 5, a plurality of input parts 51 may be provided for the main body part 50. For example, by disposing the plurality of input portions 51 radially from the center of the main body portion 50, it becomes easy to uniformly disperse and drop the waste into the heating container 11. Further, instead of providing the input part 51 on the side wall of the main body part 50, the workpiece may be arranged to fall from the upper part of the main body part 50.

  In addition, the charging unit 51 includes a double lid with the charging lid 52 and the inner lid 40 as shown by a one-dot chain line in FIGS. 1, 2, 3, and 5. You may comprise. A storage portion 41 capable of storing waste is formed between the input lid 52 and the inner lid 40. The inner lid 40 is provided so as to be openable and closable toward the inside of the main body portion 50 of the tower 5. When the inner lid 40 is closed, the storage portion 41 and the main body portion 50 of the tower 5 are blocked. On the other hand, as shown by a chain line in FIGS. 1, 3, and 5, when the inner lid 40 is opened, the storage portion 42 and the main body portion 50 of the tower 5 communicate with each other.

  In this embodiment, waste can be stored in the storage unit 41 by opening the input lid 52 with the inner lid 40 closed in order to input waste. When the closing lid 52 is sealed and the inner lid 40 is opened, the waste stored in the storage unit 41 falls into the heating container 11. As described above, in this embodiment, when the waste is charged, the inner lid 40 is always closed so that the unburned gas in the furnace is released to the outside by opening the charging lid 52. Can be prevented. Note that the opening and closing of the inner lid 40 is configured to be mechanically interlocked with the opening and closing of the charging lid 52, whereby the release of unburned gas can be reliably prevented.

  In each of the embodiments described above, the heating container 11 is composed of a graphite crucible. However, when a waste having a low melting temperature such as zinc or a low melting point aluminum alloy material is melted, the heating container 11 is inexpensive and hot. A heating container 11 made of an iron container having good conductivity can also be used. In addition, as the heating container 11, a container made of metal other than refractory ceramics or iron can be used.

DESCRIPTION OF SYMBOLS 1 Valuable metal collection | recovery apparatus 2 Combustion chamber 3 1st combustion burner 4 Flue 5 Tower 6 Gas extraction path 7 Gas processing chamber 8 2nd combustion burner 9 Gas introduction path 11 Heating vessel 13 Communication part 20 Combustion space 23 Peripheral wall 24 Floor Surface 26 Air supply port 51 Input portion 52 Input lid 55 Air supply port 56 Lower tower 57 Third combustion burner 61 Threshold member 63 Inner tube 65 Slit 68 Gas exhaust port 76 Air supply port 60 Gas outlet port 90 Auxiliary air supply Means 92 Gas outlet

Claims (7)

A valuable metal recovery device for recovering valuable metals contained in a workpiece,
A combustion chamber having a combustion space surrounded by a peripheral wall made of a refractory material and a floor surface;
A heating vessel that is disposed in the combustion chamber and has a bottom and has an opening in the upper portion and accommodates an object to be processed;
A first combustion burner for supplying heated gas into the combustion chamber;
A cylindrical tower protruding above the combustion chamber and closing an upper opening of the heating vessel;
A gas processing chamber which communicates with the tower through a gas outlet path and into which unburned gas generated when the object to be processed is heated;
A second combustion burner for supplying heated gas to the gas processing chamber;
A gas introduction path for introducing combustion gas generated in the gas processing chamber into the combustion chamber;
A flue for discharging the combustion gas in the combustion chamber to the outside ,
The said heating container is a valuable metal collection | recovery apparatus provided with the communication part which connects the upper part of the said combustion chamber, and the inside of the said tower . A valuable metal recovery device for recovering valuable metals contained in a workpiece,
A combustion chamber having a combustion space surrounded by a peripheral wall made of a refractory material and a floor surface;
A heating vessel that is disposed in the combustion chamber and has a bottom and has an opening in the upper portion and accommodates a workpiece;
A first combustion burner for supplying heated gas into the combustion chamber;
A cylindrical tower protruding above the combustion chamber and closing an upper opening of the heating vessel;
A gas processing chamber which communicates with the tower through a gas outlet path and into which unburned gas generated when the object to be processed is heated;
A second combustion burner for supplying heated gas to the gas processing chamber;
A gas introduction path for introducing combustion gas generated in the gas processing chamber into the combustion chamber;
A flue for discharging the combustion gas in the combustion chamber to the outside;
And a third combustion burner for supplying a heating gas into said tower,
The tower includes a main body portion, and a lower tower provided at a lower portion of the main body portion and having a larger inner diameter than the main body portion,
The third combustion burner is a valuable metal recovery device provided to introduce a heated gas into the lower tower. A cylindrical inner tube is provided in the tower so that a gap is formed between the inner peripheral surface of the tower body and the heated gas flows outside the inner tube. The third combustion burner is arranged as described above, and a slit-like opening for introducing the heated gas supplied from the third combustion burner into the inner tube is formed on the outer peripheral surface of the inner tube. The valuable metal recovery device according to claim 2 , wherein the valuable metal recovery device is provided. In the lower tower, a ring-shaped threshold member is provided, and the third combustion burner is disposed so that heated gas flows outside the threshold member, and the threshold member includes The valuable metal recovery apparatus according to claim 2 , wherein a communication portion that communicates the inside and outside of the threshold member is formed. A valuable metal recovery device for recovering valuable metals contained in a workpiece,
A combustion chamber having a combustion space surrounded by a peripheral wall made of a refractory material and a floor surface;
A heating vessel that is disposed in the combustion chamber and has a bottom and has an opening in the upper portion and accommodates an object to be processed;
A first combustion burner for supplying heated gas into the combustion chamber;
A cylindrical tower protruding above the combustion chamber and closing an upper opening of the heating vessel;
A gas processing chamber which communicates with the tower through a gas outlet path and into which unburned gas generated when the object to be processed is heated;
A second combustion burner for supplying heated gas to the gas processing chamber;
A gas introduction path for introducing combustion gas generated in the gas processing chamber into the combustion chamber;
A flue for discharging the combustion gas in the combustion chamber to the outside,
A valuable metal recovery apparatus in which an auxiliary air supply means for supplying a combustion-supporting gas is attached to the gas lead-out path with a gas discharge port facing the gas processing chamber.   The valuable metal recovery according to any one of claims 1 to 5, wherein the second combustion burner is disposed in the vicinity of a gas outlet of the gas outlet path inside the gas processing chamber. apparatus.   At least any one of the said combustion chamber, the said gas processing chamber, and the said tower is equipped with the air supply inlet which can introduce | transduce combustion-supporting gas from the inside into the inside. Valuable metal recovery device.

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