JP4549500B2 - Equipment for supplying shredder dust to a reverberatory furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for supplying shredder dust to a reflection furnace for burning the shredder dust obtained by pulverizing various wastes by supplying the shredder dust to a reflection furnace for smelting of minerals. Is.
[0002]
[Prior art]
In recent years, the disposal of industrial waste has become a serious social problem in Japan. Landfilling of waste is now strictly prohibited due to the limited land area, and incineration methods are also restricted in order not to produce dioxins. Under these circumstances, in order to recover various metals such as copper, gold, silver, and palladium without producing dioxins, the inventors of the present invention treat automobile shredder dust in a reflection furnace. Are trying. Here, shredder dust is a general term for fluff materials generated by crushing scrap automobiles to recover iron and aluminum. It is easier to burn than chipped tires, and valuable metals are used. Therefore, even in such an attempt, the treatment rate of shredder dust has been improved.
[0003]
FIG. 9 shows a schematic flow sheet in such an attempt. In this flow sheet, the reflection furnace 1 is a green charge type reflection furnace for smelting of minerals, particularly for copper concentrate smelting, and industrial waste such as automobile shredder dust is put into the stockyard 2 of the smelter. And is transported from the feed hopper 3 to the reflection furnace 1 by the belt conveyor 4 and loaded into the reflection furnace 1 by a supply pipe such as a pipe chute and processed in the reflection furnace 1 together with copper concentrate. In addition, oxygen-enriched air is supplied from the oxygen plant 5 to the reflection furnace 1.
[0004]
Further, the exhaust gas from the reflection furnace 1 is cooled by a waste heat boiler 6 for recovering heat, and dust is recovered in an electric dust collector 7, and SO ₂ in the gas is converted into gypsum in the exhaust de-gypsum plant 8. Collected. The steam generated in the waste heat boiler 6 is used to generate power in the power generation device 9, and this power generation amount is equal to half of the total power consumption in the smelter. On the other hand, in the converter building period, dry ore and oxygen from the oxygen plant 5 are blown into the converter 10, and the exhaust gas is sent to the sulfuric acid plant 13 via the boiler 11 and the electric dust collector 12. Further, the anode generated from the converter 10 via the refining furnace 14 becomes electrolytic copper at the electrolytic refining factory 15. And in this electrolytic purification factory 15, gold, silver, and palladium are collect | recovered as anode slime.
[0005]
[Problems to be solved by the invention]
By the way, while continuing such attempts, the inventors of the present invention have noted that there is a problem to be solved when burning shredder dust in the reflection furnace 1 in this way. One of them is that the amount of shredder dust to be processed in the reflection furnace 1 is limited by the amount of exhaust gas discharged from the reflection furnace 1. That is, the inside of the reflection furnace 1 becomes an oxygen-deficient atmosphere due to the combustion exhaust gas from the burner directly blown into the reflection furnace 1 and burned, or the exhaust gas generated by the combustion of the shredder dust already supplied. Even if new shredder dust is introduced, it does not easily burn but accumulates in the reflection furnace 1 and may not be processed.
[0006]
Further, as described above, the shredder dust is stored in the stock yard 2 of the smelter, conveyed by the belt conveyor 4 from the feed hopper 3, and loaded into the reflection furnace 1 by a pipe chute or the like and supplied. For example, if this pipe chute is erected on the ceiling portion of the reflection furnace 1 and the shredder dust is simply introduced, the amount of exhaust gas increases and the negative pressure state in the reflection furnace 1 is not sufficiently maintained. In such a case, exhaust gas or combustion gas in the furnace may blow out through the pipe chute. For this reason, for example, a double damper is provided on such a pipe chute to ensure a sealing property so that the gas in the furnace does not blow out even when the shredder dust is supplied. As a matter of course, the supply operation becomes complicated, and the continuous supply becomes difficult, and the processing amount of the shredder dust is also limited.
[0007]
The present invention was made under such a background, and as mentioned above, when supplying shredder dust to a reverberating furnace for smelting minerals and trying to burn it, it ensures sealing performance, and An object of the present invention is to provide an apparatus for supplying shredder dust to a reflection furnace capable of reliably burning shredder dust and increasing the amount of processing.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems and achieve such an object, the present invention provides a shredder dust supply device for a reflection furnace for supplying and burning a shredder dust to a reflection furnace for smelting ore smelting. In addition, a supply pipe communicating with the inside of the reflection furnace is erected on the ceiling of the reflection furnace so that the shredder dust can be supplied from the supply pipe, and oxygen-enriched air is further supplied to the supply pipe. Thus, it is possible to blow into the reflection furnace. Therefore, according to the supply device having such a configuration, since the oxygen-enriched air is supplied into the furnace together with the shredder dust from the supply pipe, the supplied shredder dust is removed even if the inside of the reflection furnace is an oxygen-deficient atmosphere. It is possible to surely burn, and thus the oxygen-enriched air is blown, so that the supply pipe can be sealed even when the shredder dust is supplied, and the gas in the furnace blows out through the supply pipe. Can be prevented.
[0009]
Here, when supplying oxygen-enriched air together with shredder dust from the supply pipe into the furnace in this way, for example, if these are to be supplied together from one supply pipe from the beginning, the shredder dust should be supplied within the supply pipe. When clogging occurs, the supply of oxygen-enriched air may be hindered and the sealing performance may be impaired. Therefore, the supply pipe is branched halfway to supply the shredder dust from one side and the other from the other side. It is desirable to blow in oxygen-enriched air. Further, when the supply pipe is branched in this way, a blowing pipe having a diameter smaller than that of the supply pipe is inserted into the other of the branched supply pipes, and the tip thereof is in the vicinity of the portion where the supply pipe branches. By positioning and blowing the oxygen-enriched air from the blowing pipe, a negative pressure can be generated in one of the branched supply pipes to which shredder dust is supplied, and the above-mentioned shredder in one of the supply pipes It becomes possible to prevent the clogging of dust itself.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIGS. 1 to 8 show an embodiment of the present invention. In this embodiment, the present invention is applied to a green charge type reflection furnace 21 for copper concentrate smelting. In the present embodiment, as shown in FIG. 1, two reflection furnaces 21 and 21 are arranged in parallel, and eight loading ports 22 are provided on the ceiling portion 21 a of these reflection furnaces 21 and 21. Each of these loading ports 22 is provided with a shredder dust supply device 23 of this embodiment as shown in FIG.
Here, as shown in FIG. 1 and FIG. 3 to FIG. 5, the reflection furnace 21 has a substantially box shape having a substantially rectangular shape in plan view, and one end side in the longitudinal direction (the lower side in FIG. 1, The right side in FIGS. 3 and 4 is the burner side, and a wall portion 21b on one end side in the longitudinal direction is formed with a large number of window portions 21c for inserting the burner, and the other end side in the longitudinal direction (see FIG. Two boilers 24, 24 are connected to one reflection furnace 21 on the wall portion 21 d on the upper side in FIG. 1 and on the left side in FIGS. 3 and 4. A plurality of copper ore charging hoppers (not shown) are arranged on the burner side of the ceiling portion 21a of the reflection furnace 21 so as to line up along the wall portions 21e and 21e extending in the longitudinal direction of the reflection furnace 21. Has been.
[0011]
Moreover, the ceiling part 21a of each reflection furnace 21 is formed so that approximately half of the one end side in the longitudinal direction, which is the burner side, is slightly raised from the other end side as shown in FIG. The eight loading ports 22 are arranged on the raised portion on the side. In the present embodiment, these loading ports 22 are arranged around the center line O in the width direction of the reflection furnace 21 in the plan view (the horizontal direction in FIGS. 1 and 5 and the vertical direction in FIG. 4). Four of the same number on the opposite side with O in between, arranged in two rows so as to form a row parallel to the center line O on each side, and the loading ports 22A of each row. , 22B... And the center line O are equal to each other.
[0012]
In addition, the four loading ports 22A, 22B,... For each row are arranged at equal intervals in the direction of the center line O, that is, in the longitudinal direction. The intervals between the two rows are equal to each other, and in the center line O direction, one loading port 22 in the other row is positioned in the center between the adjacent loading ports 22 in one row. That is, the loading ports 22A and the loading ports 22B are alternately arranged in the center line O direction in both rows. In addition, the part in which these loading ports 22 ... of the ceiling part 21a are provided has a water-cooled copper jacket structure.
[0013]
The supply device 23 of the present embodiment provided in each of the loading ports 22 arranged in this way has a lower end connected to the loading port 22 as shown in FIG. A supply pipe 25 erected on the ceiling portion 21a so as to extend vertically upward is provided. More specifically, as shown in FIGS. 6 to 8, the supply pipe 25 extends from the middle of the supply pipe 25 extending in the vertical direction. A branch pipe 26 having the same diameter as the pipe 25 is branched so as to extend obliquely upward, and a blow pipe 27 having a smaller diameter than the supply pipe 25 is inserted into the supply pipe 25 coaxially from the upper end portion thereof. It is said that. A hopper 28 is provided at the upper end of the branch pipe 26 via a detachable insertion damper, while the upper end of the supply pipe 25 into which the blow pipe 27 is inserted has a lid around the blow pipe 27. The lid 29 is provided with a viewing window 29a made of heat-resistant glass and an inspection port 29b that is normally closed.
[0014]
Among the supply devices 23 attached to the loading ports 22 ..., the supply devices 23A attached to the four loading ports 22A ... in the one row are short as shown in FIG. The branch pipe 26 is branched obliquely upward in a direction away from the center line O along a plane perpendicular to the center line O from a position near the upper end of the supply pipe 25. On the other hand, in the supply device 23B attached to the loading port 22B in the other row on the opposite side of the center line O with respect to the loading port 22A in one row, as shown in FIG. A long branch pipe 26 is parallel to the branch pipe 26 of the supply device 23A from the position near the lower end portion of the supply pipe 25 at a tilt angle equal to the branch pipe 26 of the supply device 23A, and the center line O in plan view. Is branched obliquely upward so as to extend toward the one supply device 23A... (In FIG. 2, for the sake of explanation, the inclination angle of the branch pipe 26 is different between the supply devices 23A and 23B. As shown.).
[0015]
Thus, by making the length of the branch pipe 26 different from the branch position from the supply pipe 25, the position of the loading ports 22A, 22B in the width direction in these supply devices 23A,. Although the position of the supply pipe 25 is different, the hoppers 28... Are aligned in the width direction as shown in FIG. 6 and have the same height, and are aligned on a straight line parallel to the center line O. The supply devices 23A, 23B, ... are alternately arranged. Further, a shuttle conveyor 30 extending in parallel to the center line O is disposed immediately above the hoppers 28 of the supply devices 23A, 23B,. As shown in FIG. 1, the shredder dust conveyed from the feed hopper 31 (corresponding to the feed hopper 3 in FIG. 9) via the belt conveyor 32 (also corresponding to the belt conveyor 4 in FIG. 9) with the insertion damper removed. However, when the shuttle conveyor 30 is put into the hopper 28 of each supply device 23..., It can be supplied from the supply pipe 25 into the reflection furnace 21 via the branch pipe 26.
[0016]
On the other hand, the blowing pipe 27 inserted into the supply pipe 25 through the lid 29 from the upper end of the supply pipe 25 has a lower end reaching a branching portion with the branch pipe 26 in the supply pipe 25. That is, in the one supply device 23A in which the branch pipe 26 branches from a position near the upper end of the supply pipe 25, the insertion depth of the blowing pipe 27 from the upper end of the supply pipe 25 is also reduced. In the other supply device 23B in which the branch pipe 26 branches from the vicinity of the lower end portion of the supply pipe 25, the insertion depth of the blow pipe 27 is also deepened, and both lower ends thereof are connected to the branch pipe 26 of the supply pipe 25. The opening is formed at a substantially central height of the opening formed in the branch portion.
The upper ends of the blowing pipes 27 of the supply devices 23A,..., 23B,... Are bent in the horizontal direction when protruding from the lid body 29 and connected to the one-stage large-diameter air supply pipe 33. Is connected to a supply source of oxygen-enriched air (not shown) such as the oxygen plant 5 in FIG. 9, and oxygen-enriched air having a predetermined concentration and pressure is ejected from the blow-in pipe 27 through the supply pipe 33. The shredder dust supplied through the branch pipe 26 can be blown into the reflection furnace 21. A work floor 34 is installed above the ceiling portion 21a of the reflection furnace 21 with a space therebetween, and the work floor 34 includes a water cooling plate for blocking heat from the reflection furnace 21 in this embodiment. The upper ends of the supply pipe 25 and the branch pipe 26 protrude above the work floor 34.
[0017]
Therefore, in the shredder dust supply device 23 to the reflection furnace 21 configured as described above, the branch pipe 26 is connected to the ceiling 21 a of the reflection furnace 21 from the supply pipe 25 erected via the loading port 22. Since the oxygen-enriched air blown from the blow-in pipe 27 is supplied into the reflex furnace 21 together with the shredder dust introduced through the shredder dust, the shredder dust is burned by the oxygen-enriched air supplied together, and enters the reflex furnace 21. The supplied shredder dust can be reliably burned at a high temperature even if the inside of the reflection furnace 21 is in an oxygen-deficient atmosphere. For this reason, it becomes possible to reliably process shredder dust such as discarded automobiles without generating harmful substances such as dioxins, and effectively use the heat of combustion for the smelting of minerals (copper ore). be able to.
[0018]
Further, by supplying the shredder dust together with the oxygen-enriched air into the reflection furnace 21 in this way, the loading port 22 and the supply pipe 25 of the ceiling portion 21a of the reflection furnace 21 to which the shredder dust is supplied are enriched with oxygen. Since the sealing can be performed by the air blowing pressure, even if the furnace pressure in the reflection furnace 21 fluctuates and the negative pressure state in the reflection furnace 21 is not sufficiently maintained, the supply pipe 22 can supply the supply pipe. It is possible to prevent the hot gas in the reflection furnace 21 from being blown out through 25. For this reason, it is possible to prevent a situation in which, for example, the conveyor belt of the shuttle conveyor 30 is burned due to such high-temperature gas blowout without providing a double damper as in the conventional chute pipe. And continuous supply of shredder dust can be achieved. Therefore, according to the supply device 23 having the above-described configuration, it is possible to ensure the sealing performance as described above, and to surely burn the shredder dust, and to promote stable and efficient processing of the shredder dust. Can do.
[0019]
By the way, when supplying the shredder dust and the oxygen-enriched air into the reflection furnace 21 through the supply pipe 25 in this way, for example, the shredder is provided in one supply pipe that does not include the branch pipe 26 as in the present embodiment. A means of loading dust and pumping it with oxygen-enriched air is also conceivable. However, in such a case, if the shredder dust is clogged in this one supply pipe, the supply of oxygen-enriched air is not possible. There is a risk that the above-described sealing performance by the oxygen-enriched air is impaired. On the other hand, in the supply device 23 of the present embodiment, the supply pipe 25 is branched halfway to provide the branch pipe 26, and the shredder dust is supplied from the branch pipe 26, while oxygen-enriched air is supplied. Therefore, even if the shredder dust is clogged in the branch pipe 26, the supply of the oxygen-enriched air is not interrupted, and at least a sealing property is ensured to ensure a reflection furnace. It is possible to reliably prevent the hot gas from blowing out from the inside 21.
[0020]
Further, in the supply device 23 of the present embodiment, when oxygen-enriched air is supplied from the upper end side of the supply pipe 25 in this way, a small-diameter blowing pipe 27 is inserted into the supply pipe 25 and its tip (lower end) is inserted. Is located at a connection portion of the supply pipe 25 with the branch pipe 26, and oxygen-enriched air is blown into the supply pipe 25 from the blow pipe 27 at a predetermined pressure to be supplied to the reflection furnace 21. Therefore, with this configuration, the inside of the branch pipe 26 is in a negative pressure state on the connection portion side with the supply pipe 25 due to the oxygen-enriched air blown from the blow pipe 27. The shredder dust thrown into the pipe 26 is fed so as to be drawn toward the supply pipe 26, thereby preventing the clogging of the shredder dust itself as described above, thereby ensuring a reliable and smooth shredder dust. It becomes possible to plan supply.
[0021]
On the other hand, in the present invention, when shredder dust is burned in the reflection furnace as described above, the amount of shredder dust to be processed in the reflection furnace is limited by the amount of exhaust gas discharged from the reflection furnace. In view of this, the supply device 23 of the above-described embodiment is provided to solve this problem. However, in the above case, there are problems to be solved in addition to the above-described problems. That is, if unburned shredder dust is left behind when shredder dust is supplied to the reverberatory furnace, this unburned shredder dust will remain in the reverberant furnace and form a small hill. As the shape increases, the distance from the ceiling of the reverberatory furnace becomes smaller, so when new shredder dust is supplied and burned on it, the combustion flame moves from the loading port directly above to the reverberant furnace. There is a risk that it will blow out and burn the conveyor belt as well, and if this large hill is formed on the burner side in the reverberatory furnace, combustion by the burner will be blocked, so burning shredder dust There is a risk that not only the heat but also the combustion heat of the burner cannot be effectively used for melting the copper ore.
[0022]
However, in the supply device 23 of the present embodiment, on the other hand, as described above, the shredder dust is surely burned without generating unburned residue by supplying the oxygen-enriched air, and the inside of the furnace is sealed to prevent the flame. In addition to this, in the reflection furnace 21 according to the present embodiment, the loading port 22 in which the supply device 23 is disposed in the ceiling portion 21a is connected to the burner of the reflection furnace 21. Are arranged in a staggered manner from the wall portion 21b into which the furnace is charged in the longitudinal direction of the reflection furnace 21, that is, in the combustion direction by the burner. It is possible to prevent the flame from being blown out from the loading port 22 and the combustion by the burner being blocked. That is, by arranging the loading ports 22 in a staggered manner in this way, the interval between the loading ports 22 becomes larger than, for example, a case in which the loading ports 22 are arranged in a lattice shape. Even if it is formed, it can be prevented from becoming large. Therefore, the gap with the ceiling portion 21a is maintained to prevent the flame from blowing out and the burner burns to the back of the reflection furnace 1 to melt the copper ore. In addition, it is possible to effectively use the heat of combustion of the shredder dust.
[0023]
Further, in the reflection furnace 21 according to the present embodiment, the ceiling portion 21a is formed so that a portion on one end side in the longitudinal direction of the reflection furnace 21 that is the burner side is raised from the other end side. The loading ports 22 are arranged in a staggered manner on the raised portion. Therefore, even if the hill-shaped portion is formed as described above, the space between the hill-shaped portion and the ceiling portion 21a can be sufficiently secured, so that the blowing of flame can be prevented more reliably. Is possible.
[0024]
Further, the reflection furnace 21 according to this embodiment is attached to the loading ports 22A in one row parallel to the center line O of the reflection furnace 21 among the loading ports 22 arranged in a staggered manner in this way. In the supply device 23A, the short branch pipe 26 is branched from a position near the upper end of the supply pipe 25, while in the supply device 23B attached to the loading port 22B in the other row, the supply pipe A long branch pipe 26 is branched in parallel with the branch pipe 26 of the supply device 23 from a position near the lower end of 25, and the loading ports 22A, 22B, ... are arranged in a staggered manner. The upper end positions of the branch pipes 26 to which the shredder dust is supplied are made to coincide with the height and the position in the width direction so that the hoppers 28 are arranged in a line. Therefore, in this reflex furnace 21, the shuttle conveyor 30 for supplying the shredder dust from the hoppers 28 to the supply pipes 25 of the supply devices 23A, 23B,. Since the loading ports 22 are formed in a plurality of rows in a staggered manner, a plurality of series of shuttle conveyors 30 are not required, which is economical and efficient.
[0025]
In the reflection furnace 21, the loading ports 22 are arranged in two rows in a staggered pattern. However, depending on the size of the reflection furnace 21, the loading ports 22. You may make it arrange | position in the shape. Further, as described above, instead of making the branch pipes 26 have different branch positions from the supply pipe 25 in the supply devices 23A,. As described above, the inclination angle of the branch pipe 26 may be different, or both the branch position and the inclination angle may be different.
[0026]
【The invention's effect】
As described above, according to the present invention, when supplying shredder dust to a reflecting furnace for smelting of minerals and burning it, the shredder dust is supplied into the reflecting furnace together with oxygen-enriched air, thereby reflecting. The shredder dust supplied can be surely combusted even in an atmosphere where the interior of the furnace is insufficient due to an increase in the amount of exhaust gas, and the reflection furnace can be sealed by blowing this oxygen-enriched air. Therefore, it is possible to prevent the exhaust gas in the furnace from being blown out.
Therefore, regardless of the amount of exhaust gas in the reverberatory furnace, it is possible to increase the amount of shredder dust treated, thereby promoting the stable and efficient treatment of shredder dust and using the combustion heat to produce minerals. It can be used effectively for smelting.
[Brief description of the drawings]
FIG. 1 is a plan view schematically showing a reflection furnace 21 according to an embodiment of the present invention.
FIG. 2 is a side view showing the outline of a supply device 23 according to an embodiment of the present invention as viewed in the direction of arrow A in FIG.
FIG. 3 is a side sectional view showing details of a reflection furnace 21 according to an embodiment of the present invention.
4 is a cross-sectional plan view of the reflection furnace 21 shown in FIG. 3 (however, the portion below the center line O shows the BB cross section in FIG. 3)
FIG. 5 is a half sectional view of CC in FIG. 3;
FIG. 6 is a plan view showing details of the supply device 23... Part of the embodiment of the present invention.
7 is a DD sectional view in FIG. 6. FIG.
8 is a cross-sectional view taken along the line EE in FIG.
FIG. 9 is a flow sheet of an attempt to supply shredder dust to the reflection furnace 1 for copper concentrate smelting.
[Explanation of symbols]
21 Reflecting furnace 21a Ceiling part 22 of reflecting furnace 21 (22A, 22B) Loading port 23 (23A, 23B) Supply device 25 Supply pipe 26 Branch pipe 27 Blow pipe O Center line of reflection furnace 21 in width direction

Claims (3)

An apparatus for supplying shredder dust to a reflection furnace for supplying and burning shredder dust to a reflection furnace for smelting of minerals, wherein a supply pipe communicating with the inside of the reflection furnace is provided on a ceiling portion of the reflection furnace. The shredder dust can be supplied from the supply pipe, and oxygen-enriched air is further supplied to the supply pipe so that it can be blown into the reflection furnace. Shredder dust supply device to the reverberating furnace. The shredder for a reflection furnace according to claim 1, wherein the supply pipe is branched in the middle, and the shredder dust is supplied from one of the supply pipes and the oxygen-enriched air is blown from the other. Dust supply device. A blower pipe having a smaller diameter than the supply pipe is inserted into the other of the branched supply pipes, and the tip thereof is positioned in the vicinity of a portion where the supply pipe branches, and the oxygen-enriched air is The apparatus for supplying shredder dust to a reflection furnace according to claim 1 or 2, wherein the blower is blown from the blowing pipe.

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