Shredder dust feeding facilities and reverberatory furnace provided with this feeding facilities

Abstract

The present invention relates to facilities for feeding shredder dusts to a reverberatory furnace in which shredder dusts is fed to a reverberatory furnace for non-ferrous smelting, and in particular, to facilities for feeding shredder dusts to a reverberatory furnace in which a feeding chute that passes to the inside of the reverberatory furnace is fitted to the ceiling of the reverberatory furnace and shredder dusts can be fed from this feeding chute, and which also allows oxygen enriched air to be supplied to the feeding chute and fed to the inside of the reverberatory furnace. Further, the present invention relates to a reverberatory furnace for non-ferrous smelting in which a burner is able to be installed in a wall portion of one end side thereof, and in particular, to a reverberatory furnace for non-ferrous smelting in which a plurality of feeding ports to which are connected the feeding chutes of the shredder dusts feeding facilities are provided at the one end side in the ceiling portion thereof forming a plurality of staggered rows facing the other end side.

Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a feeding facilities for shredder dusts for performing an incinerating process by burning shredder dusts comprising various shredded waste materials by feeding the shredder dusts to a reverberatory furnace for non-ferrous smelting and to a reverberatory furnace provided with this feeding facilities.

[0003] 2. Description of the Related Art

[0004] In recent years the processing of industrial waste materials has become a problem for society. Currently, the landfilling of waste materials is severely restricted and incineration methods are also regulated so as to prevent dioxin from being generated. In this situation, in order to recover various metals such as copper, gold, silver, and palladium without generating dioxin, the inventors of the present invention attempted the processing of automobile shredder dusts in a reverberatory furnace. Here, the term shredder dusts is used to refer generally to fluff materials coming out when scrapped vehicles are crushed in order to recover steel and aluminum. Shredder dusts is more easily burnt than chipped tires and also contains valuable metals; therefore, the processing ratio of such attempts is continually improving.

[0005] A schematic flow chart of the processing of automobile shredder dusts in a reverberatory furnace is shown in FIG. 9. In this flow chart, the reverberatory furnace 1 is a green charge type (wet charge type) reverberatory furnace used for non-ferrous smelting and in particular for smelting copper concentrates. Industrial waste materials such as automobile shredder dusts are stored in the stockyard 2, then transported to the reverberatory furnace 1 by conveyors 4 from the feed hopper 3 and fed into the inside of the reverberatory furnace 1 by a feeding chute composed by such as a steel pipe. The industrial waste materials are then processing in the reverberatory furnace 1 together with copper concentrates. Oxygen enriched air is also supplied to the reverberatory furnace 1 from an oxygen plant 5.

[0006] Moreover, the off-gas from the reverberatory furnace 1 is cooled through a waste heat boiler 6 for recovering heat and, then the dust in the off-gas has been collected by an electrostatic precipitator 7, SO2 in the gas is fixed as gypsum by a gypsum plant 8. Note that the steam generated in the waste heat boiler 6 is used to electrical power in a turbine generator 9, however, the amount of generated power corresponds to approximately half of the total amount of power consumption at the smelter. On the other hand, in the period when the converter is operating, dried copper concentrates and oxygen from the oxygen plant 5 are fed into the converter 10 and the off-gas is fed to the sulfuric acid plant 13 via the boiler 11 and the electrostatic precipitator 12. Moreover, an anode produced from the converter 10 via an anode furnace 14 is changed to electrolytic copper in a tank house (electro-refining plant) 15. In this tank house 15, gold, silver, and palladium are collected as anode slime.

[0007] As the present inventors were continuing the above described attempts, they noticed that there were several problems that needed to be resolved arising from the burning of shredder dusts in the reverberatory furnace 1 in the above described manner. One of these problems was that the amount of shredder dusts to be processed in the reverberatory furnace 1 was limited by the volume of off-gas expelled from the reverberatory furnace 1. Namely, if the atmosphere inside the reverberatory furnace 1 becomes insufficient in oxygen due to the off-gas generated in the burning of the shredder dusts previously supplied or to the burning off-gases caused by fuel directly fed from the burner into the reverberatory furnace 1 and burnt therein, then even if new shredder dusts is fed into the reverberatory furnace 1, this cannot be easily burnt and simply accumulates in an unprocessed state inside the reverberatory furnace 1.

[0008] Moreover, as described above, the shredder dusts is stored the stockyard 2 of the smelter, transported by the conveyor 4 from the feed hopper 3, then fed to the inside of the reverberatory furnace 1 via a feeding chute. However, for example, if the feeding chute is simply installed in the ceiling of the reverberatory furnace 1 and the shredder dusts simply fed into this chute, the off-gases increase and in cases in which it is not possible to maintain a sufficient negative draft inside the reverberatory furnace 1, there is the concern that the off-gas inside the furnace and the gas from the burning will leak out by the feeding chute. Since the sealing needs to be so secure that the gas inside the furnace does not leak even when the shredder dusts is being fed, it is necessary to provide a double damper, for example, which results, of course, in the operation of feeding the shredder dusts becoming complicated, but also means that continuous feeding is difficult. The ultimate result is that restrictions are placed on the amount of shredder dusts that can be processed.

[0009] Another problem is that if shredder dusts remains as unburnt condition when the shredder dusts is charged to the reverberatory furnace 1, this unburnt shredder dusts piles up in the reverberatory furnace 1 forming small hills (piles) in the furnace. If the dimension of these piles increases, the clearance between them and the ceiling of the reverberating furnace 1 becomes smaller. As a result, when new shredder dusts is fed to the top of the pile, the hot-gas goes out of the reverberatory furnace 1 through the feeding chute positioned directly above the flames, creating the concern that the conveyor belt used for transporting the shredder dusts may be burnt. Moreover, particularly if these large piles are formed nearby the burners inside the reverberatory furnace 1, then the burning condition of the burners is disturbed which naturally results in the burning of the shredder dusts not being possible, and also results in the burner combustion heat not being able to be used effectively for the melting of the copper concentrates.

[0010] The present invention was achieved on the basis of these circumstances and it is an object thereof to provide an facilities for feeding shredder dusts to a reverberatory furnace capable of securing the sealing of a feeding chute when shredder dusts is fed to a reverberatory furnace used for non-ferrous smelting as described above and for ensuring that the shredder dusts is burnt properly and thereby achieving an increase in the amount of this processing that can be performed.

[0011] In addition, a further aim of the present invention is to provide a reverberatory furnace in which the formation of large piles the reverberatory furnace caused by unburnt of shredder dusts is prevented, and in which the blocking of the propagation of burning heat from the burner is prevented, and also in which hot gas is prevented from leaking from inside the furnace.

SUMMARY OF THE INVENTION

[0012] In order to solve the above problems and achieve these objects, the structure described below has been employed in the present invention. Namely, the present invention relates to facilities for feeding shredder dusts to a reverberatory furnace in which shredder dusts is fed to a reverberatory furnace for non-ferrous smelting, and in particular, to facilities for feeding shredder dusts to a reverberatory furnace in which a feeding chute that passes to the inside of the reverberatory furnace is fitted to the ceiling of the reverberatory furnace and shredder dusts can be fed from this feeding chute, and which also allows oxygen enriched air to be supplied to the feeding chute and fed to the inside of the reverberatory furnace.

[0013] In this case, the feeding chute is branched partway along its length and it is desirable that the shredder dusts is fed from one end thereof while the oxygen enriched air is supplied in from the other end thereof.

[0014] It is also desirable that an air supply nozzle that has a smaller diameter than the feeding chute is inserted in the other end of the branched feeding pipe and the distal end of the air supply nozzle is positioned adjacent to the branched portion of the feeding chute and that the oxygen enriched air is supplied in from the air supply nozzle.

[0015] Furthermore, the present invention relates to a reverberatory furnace for non-ferrous smelting provided with the shredder dust feeding facilities, and in particular, to a reverberatory furnace for non-ferrous smelting in which a burner is able to be installed in a wall portion of one end side thereof and a plurality of feeding ports to which are connected the feeding chutes of the shredder dusts feeding facilities are provided at the one end side at a ceiling portion forming a plurality of staggered rows facing another end side.

[0016] In this case, it is desirable that, in the ceiling portion, the one end side where the feeding ports are provided is raised above the other end side.

[0017] Moreover, it is desirable that a feeding chute of the feeding facilities is connected to each one of the plurality of feeding ports and the positions at which shredder dusts is fed to the feeding hoppers are arranged in a single row.

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 is a plan view showing the schematic structure of a reverberatory furnace according to the present invention.

[0019] FIG. 2 is a side view as seen from the direction of the arrow A in FIG. 1 showing the schematic structure of the feeding facilities according to the present invention.

[0020] FIG. 3 is a side cross sectional view showing in detail a portion of the reverberatory furnace according to the present invention.

[0021] FIG. 4 is a horizontal cross sectional view of the reverberatory furnace shown in FIG. 3 (wherein below the center line O shows the cross section along the line B-B in FIG. 3).

[0022] FIG. 5 is a half sectional view taken along the line C-C in FIG. 3.

[0023] FIG. 6 is a plan view showing in detail a portion of the feeding facilities according to the present invention.

[0024] FIG. 7 is a cross sectional view taken along the line D-D in FIG. 6.

[0025] FIG. 8 is a cross sectional view taken along the line E-E in FIG. 6.

[0026] FIG. 9 is a flow chart for when shredder dusts is fed to a reverberatory furnace used for smelting copper concentrates.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] FIGS. 1 through 8 show an embodiment of the present invention. In this embodiment, the present invention is applied to a green charge type (wet charge type) of reverberatory furnace 21 used for smelting copper concentrates. In the present embodiment, as is shown in FIG. 1, reverberatory furnaces 21 and 21 are provided in parallel and eight feeding ports 22 . . . are provided in each ceiling portion 21a of the reverberatory furnaces 21 and 21. As is shown in FIG. 2, a shredder dusts feeding facilities 23 is provided for each of the feeding ports 22 . . . As is shown in FIG. 1 and in FIGS. 3 to 5, as seen in plan view, the reverberatory furnaces 21 are formed in a substantially elongated schematic box shape and one end side in the longitudinal direction thereof (i.e. the bottom side in FIG. 1 and the right side in FIGS. 3 and 4) is the side where the burner is provided. A plurality of window portions 21c for burner installation are formed in the wall portion 21b of the one end side in the longitudinal direction, and two waste heat boilers 24 and 24 are connected to each reverberatory furnace 21 at the wall portion 21d of the other end side in the longitudinal direction (i.e. at the top side in FIG. 1 and the left side in FIGS. 3 and 4). Note that a plurality of unillustrated hoppers used for inserting copper concentrates are provided at the burner side of the ceiling portions 21a of the reverberatory furnaces 21 in a line along the wall portions 21e and 21e that extend in the longitudinal direction of the reverberatory furnace 21.

[0028] Approximately half of each ceiling portion 21a of the reverberatory furnaces 21 at the one end side in the longitudinal direction where the burner is situated is formed slightly raised above the other end side, as is shown in FIG. 3, and the above eight feeding ports 22 . . . are provided at this raised portion at the one end side. These feeding ports 22 . . . are arranged in two rows as seen in plan view in the vicinity of the center line O in the transverse direction of the reverberatory furnace 21 (i.e. in the horizontal direction in FIGS. 1 and 5 and in the vertical direction in FIG. 4) such that the same number (four) thereof are placed on either side of this center line O and in rows parallel thereto. In addition, the distance from each row of feeding ports 22A . . . and 22B . . . to the center line O is equal.

[0029] In addition, the four feeding ports 22A . . . and 22B . . . in each row are arranged equidistantly in the direction of the center line O, namely, in the aforementioned longitudinal direction. Moreover, the distance between adjacent feeding ports 22 and 22 in the direction of the center line O is set equal to each other in the same row. In addition, the feeding ports of the other row are positioned at the center of adjacent feeding ports 22 and 22 in the direction of the center line of one row. Namely, the feeding ports 22A and the feeding ports 22B are arranged so as to alternate in a staggered (i.e. zigzag) pattern along the direction of the center line O. Note that the portion of the ceiling portion 21a where these feeding ports 22 . . . are provided is constructed as a water cooled copper jacket.

[0030] As is shown in FIG. 2, the bottom ends of the feeding facilities 23 provided for each of the feeding ports 22 . . . arranged in this way are connected to the feeding ports 22 and open onto the inside of the reverberatory furnace 21. In addition, the feeding facilities 23 are provided with feeding chute 25 that are provided at the ceiling portion 21a so as to extend vertically upwards. More specifically, as is shown in FIGS. 6 to 8, branch pipes 26 having the same diameter as the feeding chute 25 branch out extending in a diagonally upward direction from partway along the vertically extending feeding chutes 25. In addition, air supply nozzles 27 having a smaller diameter than the feeding chutes 25 are inserted coaxially with the feeding chutes 25 into the feeding chutes 25 from the top end thereof. Hoppers 28 are provided via a freely removable insertion damper at the top end portion of the branch pipes 26, namely, at the position where shredder dusts is fed to the feeding chutes 25. At the top end portion of the feeding chutes 25 into which the air supply nozzles 27 are inserted, the peripheries of the air supply nozzles 27 are sealed by lid bodies 29. An observation window 29a manufactured from heat resistant glass and an inspection opening 29b that is normally closed are provided in each lid body 29.

[0031] Here, as is shown in FIG. 7, in the feeding facilities 23A . . . attached to the four feeding ports 22A . . . forming the aforementioned one row from out of the feeding facilities 23 attached to the feeding ports 22 . . . , short branch pipes 26 branch from a position in the upper end portion of the feeding chutes 25 diagonally upwards in a direction away from the center line O along a plane that intersects the center line O. In contrast, as is shown in FIG. 8, in the feeding facilities 23B . . . attached to the feeding ports 22B . . . forming the other row and positioned on the opposite side of the center line O from the one row of feeding ports 22A . . . , long branch pipes 26 branch from a position in the bottom end portion of the feeding chutes 25 diagonally upwards at a sloping angle equal to that of the above branch pipes 26 of the feeding facilities 23A along a plane that intersects the center line O. Furthermore, as seen in plan view, these branch pipes 26 extend beyond the center line O to the side of the one feeding facilities 23A . . . (note that, for this description, in FIG. 2, the sloping angles of the branch pipes 26 in both feeding facilities 23A and 23B are shown as being different).

[0032] By making the length and the positions where the branch pipes 26 branch from the feeding chutes 25 different, regardless of whether or not the positions of the feeding ports 22A and 22B in the transverse direction in the feeding facilities 23A . . . and 23B . . . are different, namely, regardless of whether or not the positions of the feeding chutes 25 are different, the hoppers 28 are provided on a straight line parallel with the center line O such that the positions of the hoppers 28, namely, the positions at which the shredder dust is fed to the feeding chutes 25, have the same height and match each other in the transverse direction, as is shown in FIG. 6. Furthermore, a shuttle conveyor 30 is provided extending parallel to the center line O directly above the hoppers 28 . . . of the feeding facilities 23A . . . and 23B . . . arranged thus in a straight line. As a result, when the insertion dampers are removed to the branch pipes 26, as is shown in FIG. 1, by loading the shredder dust that has been transported via the conveyor belt 32 (corresponding to the conveyor belt 4 in FIG. 9) from the feed hopper 31 (corresponding to the feed hopper 3 in FIG. 9) into the hoppers 28 of each feed facilities 23 . . . from the shuttle conveyor 30, it is possible to feed the shredder dust into the reverberatory furnace 21 through the feed chutes 25 via the branch pipes 26.

[0033] The bottom ends of the air supply nozzles 27 that are inserted into the feed chutes 25 through the lid portions 29 from the top end portion of the feeding chutes 25 reach as far as the branch portion of the branch pipes 26 with the feeding chutes 25. Accordingly, in the feeding facilities 23A in which the branch pipes 26 branch from the top end portion of the feeding chutes 25, while the insertion depth of the air supply nozzles 27 from the top end portion of the feeding chutes 25 is shallow, in the feeding facilities 23b in which the branch pipes 26 branch from the bottom end portion of the feeding chutes 25, the insertion depth of the air supply nozzles 27 is deep. In this case, the bottom ends of all of the air supply nozzles 27 are positioned substantially in the center in the vertical direction of the opening formed at the branch portion of the branch pipes 26 with the feeding chutes 25. In contrast, the top end portion of the air supply nozzles 27 of each feeding facilities 23A . . . and 23B . . . are bent in a horizontal direction at the point where they protrude from the lid bodies 29 and are then connected with larger diameter air supply pipes 33. Each air supply pipe 33 is connected to an unillustrated oxygen enriched air supply source such as, for example, the oxygen plant 5 shown in FIG. 9. Oxygen enriched air having a predetermined density and pressure is expelled from the air supply nozzles via the air supply pipes 33 and is able to be supplied into the reverberatory furnace 21 together with shredder dust fed through the branch pipes 26. Note that an operation floor 34 is placed at a distance above the ceiling portion 21a of the reverberatory furnace 21. In the present embodiment, the operation floor 34 is provided with a water cooled plate to insulate it from the heat from the reverberatory furnace 21 and the top end portions of the feeding chutes 25 and the branch pipes 26 protrude above this operation floor 34.

[0034] In the facilities 23 for feeding shredder dusts to the reverberatory furnace 21 having the structure described above, in order to feed shredder dust that is inserted via the branch pipes 26 from the feeding chutes installed via the feeding ports 22 in the ceiling portion 21a of the reverberatory furnace 21 together with oxygen enriched air supplied in through the air supply nozzles 27 to the reverberatory furnace 21, the shredder dusts is inserted into the reverberatory furnace 21 while being burnt by the oxygen enriched air that is supplied together with it. Accordingly, even if the atmosphere inside the reverberatory furnace 21 becomes insufficient in oxygen, it is possible to ensure that the fed shredder dust is incinerated at a high temperature. The result of this is that shredder dust from scrapped automobiles and the like can be reliably processed without generating harmful materials such as dioxin, and also that the heat from the combustion can be used effectively for the smelting of (for example copper concentrates). Moreover, it is possible to suppress the actual formation of the aforementioned piles caused by unburnt shredder dust.

[0035] In addition, by feeding shredder dust together with oxygen enriched air to the inside of the reverberatory furnace 21 in this way, the feeding chutes 25 and the feeding ports 22 in the ceiling 21a of the reverberatory furnace 21 to which the shredder dusts is fed can be sealed by the pressure of the supplying of the oxygen enriched air. Accordingly, even if the furnace pressure inside the reverberatory furnace 21 changes and a sufficient negative pressure state cannot be maintained inside the reverberatory furnace 21, it is possible to prevent the high temperature gas inside the reverberatory furnace 21 from leaking from the feeding ports 22 through the feeding chutes 25. As a result, without providing a double damper as in a conventional chute pipe, for example, it is possible to prevent a state in which the conveyor belt of the shuttle conveyor 30 is burned from occurring, and a continuous feed of the shredder dusts becomes possible. Namely, according to the feeding facilities 23 having the above described structure, the sealing performance is secured and it is possible to reliably burn the shredder dusts and stable, efficient processing of shredder dust can be promoted.

[0036] It should be noted that if oxygen enriched air and shredder dusts are fed in this way via the feeding chutes 25 to the interior of the reverberatory furnace 21, it is also possible to consider, for example, a means in which the branch pipes 26 as they are in the present embodiment are not provided, and shredder dusts is fed to a single feed pipe and is then pressure supplied by oxygen enriched air. However, in a means such as this, the risk of the shredder dusts becoming blocked inside this single feed pipe and the supply of the oxygen enriched air being obstructed and the oxygen enriched air then damaging the sealing performance described above must be considered. In contrast to this, in the feeding facilities 23 of the present embodiment, the branch pipes 26 are provided branching off from partway along the feeding chutes 25 and shredder dusts is fed from these branch pipes 26 while oxygen enriched air is supplied from the top end portion of the feeding chutes 25. Accordingly, even if the shredder dusts becomes blocked inside the branch pipes 26, the supply of the oxygen enriched air is not cut off and, at the least, the sealing performance can be ensured due to the oxygen enriched air and it is possible to reliably prevent high temperature gas from leaking from inside the reverberatory furnace 21.

[0037] Furthermore, in the feeding facilities 23 of the present embodiment, when oxygen enriched air is supplied from the top end portion of the feeding chutes 25, the small diameter air supply nozzles 27 are inserted into the feeding chutes 25 and the distal end (i.e. the bottom end) thereof is positioned at the connecting portion of the branch pipes 26 with the feeding chutes 25, and oxygen enriched air is supplied from the air supply nozzles 27 at a predetermined pressure into the feeding chutes 25 and fed into the reverberatory furnace 21. Accordingly, because the portions inside the branch pipes 26 where they connect to the feeding chutes 25 are placed in a negative pressure condition by the oxygen enriched air supplied in via the air supply nozzles 27, the shredder dusts inserted into the branch pipes 26 from the hoppers 28 is fed by being sucked into the feeding chutes 25. As a result, it is possible to prevent the shredder dusts from becoming blocked and to achieve a reliable and smooth feed of shredder dusts.

[0038] In addition, in the reverberatory furnace 21 of the present embodiment, in the ceiling portion 21a, the plurality of feeding ports 22 in which the above feeding facilities 23 are provided are placed in a staggered arrangement running from the wall portion 21b of the reverberatory furnace 21 in which the burners are placed in the longitudinal direction of the reverberatory furnace 21, namely, in the direction of the burning by the burners. As a result, it is possible to prevent the formation of the above described large piles inside the reverberatory furnace 21 and to prevent flames from escaping out from the feeding ports 22 . . . and the burning of the burner being obstructed. Namely, by placing the feeding ports 22 . . . in a staggered arrangement, the distance between each of the feeding ports 22 and 22 is increased compared with if, for example, they were placed in a lattice arrangement. Therefore, even if the piles are formed, they can be prevented from becoming too large. The result of this is that, as described above, the gap to the ceiling 21a is maintained and flames are prevented from escaping. In addition, it is possible to spread the burning of the burner over the whole interior of the reverberatory furnace 21 (i.e. as far as the other side) and to melt the copper concentrates, and also to effectively use the heat of the burning of the fed shredder dust.

[0039] Furthermore, in the reverberatory furnace 21 of the present embodiment, the portion at one end side of the ceiling portion 21a in the longitudinal direction of the reverberatory furnace 21 where the burner is situated is formed slightly raised above the other end side, and the feeding ports 22 . . . are provided in a staggered arrangement in this raised portion. Accordingly, even if the above described piles do become formed, it is possible to ensure that a sufficient clearance is maintained between the piles and the ceiling portion 21a, therefore, it is possible to even more reliably prevent flames from leaking.

[0040] It should be noted that when the feeding ports 22 . . . are arranged in two rows in a staggered arrangement in this manner, if the feeding chutes 25 . . . of the feeding facilities 23 . . . connected to the feeding ports 22 . . . are only provided in the ceiling portion 21a extending vertically, then the feed positions where shredder dusts is fed to these feeding pipes 25 . . . , namely, the positions of the hoppers 28 . . . also end up being arranged in two staggered rows. Accordingly, in order to insert the shredder dusts into this type of hopper 28 . . . , it is necessary to provide two rows of shuttle conveyors for transporting the shredder dusts from the conveyor belt 32 to a single reverberatory furnace 21.

[0041] In contrast, in the case of the reverberatory furnace 21 of the present embodiment, in the feeding facilities 23A . . . attached to the feeding ports 22A . . . forming the one row parallel to the center line O in the reverberatory furnace 21 from out of the feeding ports 22 . . . arranged in a staggered pattern, short branch pipes 26 branch from a position in the upper end portion of the feeding pipes 25 while, in the feeding facilities 23B . . . attached to the feeding ports 22B . . . forming the other row, long branch pipes 26 branch from a position in the bottom end portion of the feeding chutes 25 parallel to the branch pipes 26 of the feeding facilities 23A. Furthermore, the top end positions of the branch pipes 26 . . . to which the shredder dusts is fed match each other in height and in their positions in the transverse direction and a single row of the hoppers 28 . . . is provided at the top end thereof. Accordingly, in this reverberatory furnace 21, there only needs to be a single row of the shuttle conveyor 30 for feeding the shredder dust from the hoppers 28 . . . to the feed chutes 25 . . . of each of the feed facilities 23A . . . and 23B . . . via the branch pipes 26 . . . As a result, even if there are a plurality of rows of the feeding ports 22 . . . arranged in a staggered pattern, there does not need to be a plurality of rows of shuttle conveyors 30, which is economical as well as efficient.

[0042] Note that, in this reverberatory furnace 21, the feeding ports 22 . . . are arranged in two rows in a staggered pattern, however, it is also possible for the feeding ports 22 . . . to be arranged in three or more rows in the above staggered pattern depending on the size and the like of the reverberatory furnace 21. Moreover, in each row of the feeding facilities 23A . . . and 23B . . . , instead of forming the branch pipes 26 all at an equal slope angle branching out from different positions of the feeding chutes 25, as described above, it is possible, as is shown in FIG. 2, to provide branch pipes 26 having different slope angles and to make both the branch position and the slope angle different. In these examples, in the same way as in the present embodiment, it is also possible to make the positions (the positions of the hoppers 28 . . . in the present embodiment) from which the shredder dusts is fed to the feed chutes 25 . . . in one row.

Claims

1. Facilities for feeding shredder dusts to a reverberatory furnace in which shredder dusts is fed to a reverberatory furnace for non-ferrous smelting and is burned, wherein a feeding chute that passes to the inside of the reverberatory furnace is fitted to a ceiling of the reverberatory furnace and shredder dusts can be fed from the feeding pipe, and wherein oxygen enriched air can also be supplied to the feeding nozzle and fed to the inside of the reverberatory furnace.

2. The facilities for feeding shredder dusts according to claim 1, wherein the feeding chute is branched partway along its length and the shredder dusts is fed from one end of the branched pipe while the oxygen enriched air is supplied in from the other end of the branched pipe.

3. The facilities for feeding shredder dusts according to claim 1 or 2, wherein an air supply nozzle that has a smaller diameter than the feeding chute is inserted in the other end of the branched feeding chute and the distal end of the air supply nozzle is positioned adjacent to the branched portion of the feeding chute and the oxygen enriched air is supplied in from the air supply nozzle.

4. A reverberatory furnace for non-ferrous smelting provided with the shredder dusts feeding facilities, wherein a burner is able to be installed in a wall portion of one end side of the reverberatory furnace and a plurality of feeding ports to which are connected the feeding chutes of the shredder dusts feeding facilities are provided at the one end side in a ceiling portion forming a plurality of staggered rows facing the other end side.

5. The reverberatory furnace according to claim 4, wherein in the ceiling portion, the one end side where the feeding ports are provided is raised above the other end side.

6. The reverberatory furnace according to claim 4 or 5, wherein a feed chute of the feed facilities is connected to each one of the plurality of feeding ports and the positions at which shredder dusts is fed to the feeding hoppers are arranged in a single row.