JP5335845B2 - Apparatus for recovering copper contained in exhaust gas dust and method for recovering copper contained in exhaust gas dust - Google Patents

Description

  The present invention relates to a method for recovering copper contained in dust in exhaust gas in a smelting process.

  In the nonferrous metal smelting process, the metal powder being smelted is mixed with dust in the exhaust gas discharged from the converter. For example, smelting dust discharged by copper smelting contains 5 to 25% by weight of copper. This dust is leached with acid, neutralized or sulfided, etc., and copper is separated and recovered from impurities such as lead and bismuth, sent to the smelting process, and copper smelting is repeated again. In addition, copper that cannot be sufficiently separated by the above-described treatments such as acid leaching, neutralization, and sulfidation causes sedimentation due to gravity as in the wet classification method for metal and metal compound powders and granules shown in Patent Document 1. Separation is performed with a wet classifier.

JP 2007-231333 A

  By the way, when the copper content rate in smelting dust is high, the copper content rate in the impurity residue which has lead and bismuth as a main component will increase, and the copper collection rate will be reduced. As a method for separating and recovering copper in the dust treatment step, dissolution with dilute sulfuric acid and the above-described wet classification were performed, but about 20% of the amount of copper is mixed into undissolved residue mainly composed of lead and bismuth. Regarding dissolution with dilute sulfuric acid, it is possible to further increase the amount of copper recovered by selecting each condition such as dilute sulfuric acid concentration, temperature, time, etc., but increase the chemical cost and make the equipment large-scale There is a need. In addition, when we try to increase the copper recovery rate, wet classifiers also increase impurities such as lead and bismuth that accompany copper, increasing the amount of repetitive lead and bismuth refining processes, which increases processing costs. To do.

  Then, this invention makes it a subject to collect | recover copper efficiently from waste gas dust in the recovery apparatus of the copper contained in waste gas dust.

The apparatus for recovering copper contained in the exhaust gas dust of the present invention that solves such problems reduces the flow rate of the gas discharged from the copper smelting converter, and downstream of the dust containing copper sulfide contained in the gas. It is characterized in that the amount recovered in the process is reduced. By reducing the flow rate of the gas discharged from the converter, copper sulfide or metal copper having a large particle size contained in the gas can be dropped and easily separated from the exhaust gas, and recovered efficiently.
Here, the particle size of the dust contained in the gas discharged from the copper smelting converter is 10 μm or more and 250 μm, as described in JP 2007-231333 A. The particle size of impurities other than the copper compound composed of lead sulfate or the like is set to 10 μm or less, and the present invention utilizes this particle size difference to recover copper sulfide or metal copper.

  In the above-described recovery apparatus for copper contained in the exhaust gas dust, a horizontal flue through which the gas discharged from the converter flows in a horizontal direction, and one end connected to the ceiling portion of the horizontal flue so that the exhaust gas flows. And a flow rate of the gas flowing through the rising flue is reduced. By reducing the flow velocity of the gas flowing into the rising flue, dust having a large particle size contained in the gas falls into the horizontal flue. Thereby, dust having a large particle size can be easily separated from the exhaust gas, and the metal can be efficiently recovered. Dust remaining in the gas is recovered by an electrostatic precipitator in a downstream process, but the process required to recover the copper component from the dust is reduced, leading to a reduction in processing costs.

  In the copper recovery device contained in the exhaust gas dust, the flow rate of the gas flowing into the rising flue can be reduced so that copper sulfide falls in the horizontal flue.

  In the copper recovery device contained in the exhaust gas dust, the flow area of the rising flue can be increased. Further, the number of passages of the rising flue can be increased. By setting it as such a structure, since the flow velocity of the gas which flows through the said rising flue falls, dust with a big particle size can be collect | recovered.

Furthermore, considering the flow rate of the gas from which the copper sulfide falls, the flow rate of the gas flowing through the rising flue can be 3 to 8 m / s in the copper recovery device contained in the exhaust gas dust.
Here, the particle size of copper sulfide is widely distributed in a range of 10 to 100 μm, and the existing ratio of copper sulfide and metal copper is about 9: 1, which is larger in copper sulfide. Based on the specific gravity of copper sulfide of 5.6 and the specific gravity of metal copper of 8.96, the gas flow rate is studied based on copper sulfide. When the gas flow rate is 8 m / s, copper sulfide of about 70 μm or more is Considering that metal copper can be dropped into the flue and has a higher specific gravity than copper sulfide, it can be determined that most of the metal copper can be recovered. When the gas flow rate is 3 m / s, most of the copper sulfide of 10 μm or more is expected to be recovered, and dust other than copper compounds such as lead sulfate having a particle size of about several μm (10 μm or less) is flue. Since it is more sucked and does not fall into the horizontal flue, the copper component can be efficiently separated and recovered from the horizontal flue.

  In the copper recovery device contained in the exhaust gas dust, copper sulfide or metal copper having a large particle size can be separated from the exhaust gas dust, thereby improving the copper recovery rate. Among the copper compounds generated in the copper converter, copper sulfide having a large particle size falls into the horizontal flue, so that the copper sulfide can be easily separated from the exhaust gas and copper can be efficiently recovered. Since the proportion of copper sulfide in the exhaust gas is large, by collecting this in the horizontal flue, the processing cost can be reduced in the step of recovering the copper component from the remaining residue.

  Furthermore, in the copper recovery device contained in the exhaust gas dust, a dust recovery device can be installed at the bottom of the horizontal flue. With such a configuration, the copper sulfide contained in the dust accumulated at the bottom of the horizontal flue can be easily recovered.

  Further, the method for recovering copper contained in the exhaust gas dust of the present invention reduces the flow rate of the gas discharged from the copper smelting converter, and downstream of the dust containing copper sulfide or metal copper contained in the gas. It is characterized in that the amount recovered in the process is reduced.

  The method for recovering copper contained in the exhaust gas dust includes the first step of flowing the gas discharged from the converter in the horizontal direction, starting the exhaust gas, reducing the flow rate of the exhaust gas, And a second step of dropping the contained copper sulfide or metal copper.

  In the method for recovering copper contained in the exhaust gas dust, copper sulfide or metal copper having a large particle size can be dropped in the second step.

  In the above method for recovering copper contained in the exhaust gas dust, the flow rate of the exhaust gas raised in the second step can be set to 3 to 8 m / s.

  In the above method for recovering copper contained in the exhaust gas dust, in the second step, the flow area of the exhaust gas can be enlarged to reduce the flow rate of the exhaust gas.

  In the method for recovering copper contained in the exhaust gas dust, the number of passages through which the exhaust gas flows can be increased in the second step, and the flow rate of the exhaust gas can be decreased.

  In the above method for recovering copper contained in exhaust gas dust, copper sulfide or metal copper having a large particle size can be separated from exhaust gas dust to improve the copper recovery rate.

  The method for recovering copper contained in the exhaust gas dust can be a method including a third step of recovering the dust separated in the second step.

  The apparatus for recovering copper contained in the exhaust gas dust of the present invention (1) can easily separate and recover copper sulfide having a large particle size from the exhaust gas dust by dropping it. (2) The copper sulfide recovered in this way can go through the smelting process again. (3) By separating the copper sulfide from the exhaust gas in this way, the processing cost for separating the copper sulfide in the subsequent exhaust gas processing step can be reduced.

It is explanatory drawing which showed schematic structure of the collection | recovery apparatus of the copper contained in the waste gas dust of an Example. It is explanatory drawing which showed the cross section cut | disconnected by the AA line of FIG. The copper recovery apparatus contained in the exhaust gas dust of a comparative example is shown. It is explanatory drawing which showed the particle size distribution of the dust in the waste gas which flowed into the standing flue. It is explanatory drawing which showed the particle size distribution of the residue which carried out the dilute sulfuric acid leaching of the dust collect | recovered with the electric dust collector of the downstream process with the beaker. It is explanatory drawing of the collection | recovery apparatus of the copper contained in the waste gas dust of another structure.

  Hereinafter, an embodiment for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory diagram showing a schematic configuration of a copper recovery device (hereinafter simply referred to as “recovery device”) 1 contained in exhaust gas dust of the first embodiment. FIG. 2 is an explanatory view showing a cross section taken along line AA of FIG. The recovery device 1 recovers the metal contained in the exhaust gas dust in the copper smelting process, that is, the copper compound and metal copper by dry classification.

  The recovery device 1 has one end connected to a horizontal flue 3 (first flue) into which exhaust gas discharged from the four converters 2a, 2b, 2c, and 2d flows, and a ceiling portion of the horizontal flue 3. , Rising flue 4, 5, 6 (second flue) through which exhaust gas flows from the horizontal flue 3.

  The horizontal flue 3 is formed so that gas flows in the horizontal direction. Connection holes 31a, 31b, 31c, and 31d that connect to the converters 2a, 2b, 2c, and 2d are provided on the side of the horizontal flue 3. The exhaust gas discharged from the converters 2a, 2b, 2c, and 2d flows into the horizontal flue 3 from these connection holes 31a, 31b, 31c, and 31d. A flow conveyor 7 is installed at the bottom of the horizontal flue 3. The flow conveyor 7 conveys the dust that falls and accumulates in the horizontal flue 3 to one end of the horizontal flue 3 to facilitate the collection of the dust.

  One end of the rising flue 4 is connected to the ceiling portion of the passage between the connection holes 31 a and 31 b on the horizontal flue 3. One end of the rising flue 5 is connected to the ceiling portion of the passage between the connection holes 31 c and 31 d on the horizontal flue 3. One end of the rising flue 6 is connected to the ceiling portion of the passage between the connection holes 31 b and 31 c on the horizontal flue 3. The other ends of the rising flues 4, 5, 6 merge at the merging portion 8. A flue 9 is connected to the merging portion 8, and exhaust gases flowing through the rising flues 4, 5, 6 merge at the merging portion 8, and then pass through the flue 9 to an electric dust collector (not shown). Then, it is sent to a cleaning / cooling facility (not shown).

The rising flues 4 and 5 are flues having an inner diameter of 2.1 m and a length of 25.7 m. However, a part of the rising flues 4 and 5, specifically, a section of 17.7 m in the direction in which the exhaust gas flows from the ceiling side of the horizontal flue 3 has an inner diameter of 2.6 m. The rising flue 6 is a flue having an inner diameter of 2.6 m and a length of 17.7 m. Further, the flue 9 has an inner diameter of 3.0 m, and is configured by calculating the flow velocity so that it does not accumulate inside the dust flue in the combined exhaust gas. The rising flues 4 to 6 are substantially circular tubes. The cross-sectional area of the horizontal flue 3 is about 6.26 m ² .

By the way, the dust in the exhaust gas of the copper smelting converter contains copper sulfide Cu ₂ S, a copper compound of copper sulfate CuSO ₄ , and metal copper. A part of these copper compounds falls into the horizontal flue 3 together with other dust, and another part is collected by a subsequent electric dust collector and processed in a separate process.

  In the present embodiment, the total cross-sectional area of the second flue is set larger than the cross-sectional area of the first flue. Thereby, the gas flow rate in the 2nd flue can be made lower than the gas flow rate in the 1st flue. In this case, when particles such as copper sulfide and metal copper contained in the exhaust gas flowing through the first flue flow into the second flue, they can be dropped into the first flue. Thereby, copper can be efficiently recovered.

  In this embodiment, the horizontal flue and the rising flue are used, but the present invention is not limited to this. For example, in a flue comprising a first flue through which exhaust gas discharged from a copper smelting converter flows and a second flue connected downstream of the first flue, the gas flow rate in the second flue By lowering than the gas flow rate in the first flue, copper sulfide, metal copper, etc. can be dropped in the first flue. Therefore, the first flue and the second flue may extend in the same direction.

  However, the second flue is preferably connected to the ceiling portion of the first flue and is inclined vertically upward from the extending direction of the second flue. This is because copper sulfide, metal copper and the like flowing into the second flue can be efficiently dropped into the first flue. It is preferable that the second flue extends vertically upward. This is because copper sulfide, metal copper, and the like flowing into the second flue can be dropped more efficiently into the first flue. In addition, the 1st flue may not extend horizontally and may incline from the horizontal direction.

  Moreover, it is preferable that one or more second flues are provided, and the total cross-sectional area of the one or more second flues is larger than the cross-sectional area of the first flues. This is because the gas flow rate in the second flue can be made smaller than the gas flow rate in the first flue. The total cross-sectional area of the second flue provided is preferably 1.7 times or more of the cross-sectional area of the first flue, more preferably 2 times or more, and 2.5 times or more. More preferably. This is because the gas flow rate in the second flue can be further reduced. The cross-sectional area of each second flue is preferably larger than the cross-sectional area of the first flue. This is because the gas flow velocity in each second flue can be made smaller than the gas flow velocity in the first flue.

  FIG. 3 shows a copper recovery device (hereinafter simply referred to as “comparative recovery device”) 100 contained in the exhaust gas dust of the second embodiment. Next, the collection apparatus 100 of Example 2 will be described. The recovery device 100 of the second embodiment is different from the recovery device 1 of the first embodiment in that the rising flue 6 is not provided. In other words, the recovery device 1 of the first embodiment has three rising flues, but the recovery device 100 of the second embodiment is different in that there are two rising flues. In addition, the other structure of the collection | recovery apparatus 100 of Example 2 is the same as the collection | recovery apparatus 1 of Example 1, About the same component as the collection | recovery apparatus 1, the same reference number is attached | subjected in drawing, The Detailed description is omitted.

  Also in the present embodiment, the total cross-sectional area of the second flue is set larger than the cross-sectional area of the first flue. Thereby, the gas flow rate in the 2nd flue can be made lower than the gas flow rate in the 1st flue. As a result, when particles such as copper sulfide and metal copper contained in the exhaust gas flowing through the first flue flow into the second flue, they can be dropped into the first flue. Thereby, copper can be efficiently recovered.

(Comparison between Example 1 and Example 2)
Next, a comparison between the recovery device 1 of the first embodiment and the recovery device 100 of the second embodiment will be described. Table 1 shows the results of the trial calculation of the rising flue gas flow rate and the copper sulfide trapping particle diameter in Example 1 and Example 2 when the exhaust gas temperature was 350 ° C.

In the recovery device 1 of the first embodiment having three rising flues, the total area of the flow path into which the exhaust gas flows is 1.5 times that of the recovery device 1 of the second embodiment having two rising flues. Therefore, as shown in Table 1, the flow rate is 2/3. In Example 2, copper sulfide Cu ₂ S having a particle diameter of 77.9 μm or more is collected in the horizontal flue 3. On the other hand, in Example 1, copper sulfide Cu ₂ S having a particle diameter of 63.6 μm or more is collected in the horizontal flue 3. That is, in Example 1, since the flow velocity of exhaust gas rising into the flue 4, 5, 6 is slow, even copper sulfide Cu ₂ S having a smaller particle diameter is deposited on the horizontal flue 3.

Next, the actual measurement result of the gas flow rate will be described. The gas flow rate was measured three times by changing the combination of converters to be operated. Table 2 is an explanatory view showing the measurement result of the first gas flow rate. Table 3 is an explanatory view showing the measurement result of the second gas flow rate. Table 4 is an explanatory view showing the measurement result of the third gas flow rate. The first time, forging was performed in the converter 2c, and copper was formed in the converter 2d. For the second time, steelmaking was performed in the converter 2a, and copper was made in the converter 2c. For the third time, forging was performed in the converter 2d, and copper was formed in the converter 2a. The converter introduction fan was operated at a rotational speed of 830 rpm. The measurement is performed at the measurement point shown in FIG. 1, and the gas amount is an average of four measurement values measured from the upper part to the lower part of the flue at the measurement point.

From this result, the following points can be explained.
(1) As a result of measuring the flow rate of exhaust gas by selecting a furnace for making steel and a furnace for making copper, there was almost no deviation due to the combination of operating furnaces.
(2) Since the rising flue 6 is connected to the flue 9 after joining a little linearly, the flow rate of the exhaust gas is faster than that of the other rising flues 4 and 5. Further, the flow velocity was almost the same as the trial calculation result (6.02 m / s), and the flow velocity was reduced as expected. On the other hand, the reason why the flow velocity of the rising flues 4 and 5 is slower than that assumed is that the temperature is substantially lower than the assumed temperature 350 ° C.
(3) The average collected particle size was close to the estimated value (63.6 μm). Therefore, as estimated, dust having a large particle size was collected in the horizontal flue 3.

  Next, the particle size of the dust collected in the rising flue will be described. FIG. 4 is an explanatory diagram showing the particle size distribution of the dust in the exhaust gas flowing into the flue in the first and second embodiments. The solid line in FIG. 4 shows the particle size distribution of Example 1, and the broken line shows the particle distribution of Example 2. FIG. 5 is an explanatory view showing the particle size distribution of the residue obtained by leaching the dust collected by the electrostatic precipitator with dilute sulfuric acid in a beaker. This residue has a sulfuric acid concentration of 15 g / L after leaching. The slurry concentration was adjusted to 250 g / L, filtered after 3 hours of stirring and leaching.

  As shown in FIG. 4, the particle size distribution of the dust in the exhaust gas of Example 1 has a peak at a particle size of 1.0 to 2.0 μm, and the presence frequency of dust of 10 μm or more is 1% or less, and the particle size is 70 μm. The presence frequency of the above dust is almost 0%. Since the flow velocity in the rising flue is reduced to about 2/3 compared to Example 2, the presence frequency of dust of 10 μm or more is extremely low, and dust having a particle size of 70 μm or more is horizontal without being sucked into the rising flue. It turns out that it has fallen into the flue 3. On the other hand, dust having a particle diameter of 10 μm or less is more contained in the exhaust gas in Example 1 than in Example 2. This can be explained as follows. That is, in the collection device 100 of the second embodiment, in the horizontal flue 3, there is a long section 32 between the two rising flues 4, 5, so that the particle diameter is 10 μm while the exhaust gas passes through the section 32. The following dust also accumulates. On the other hand, in the recovery device 1 of the first embodiment, the rising flue 6 is between the rising flues 4 and 5, so the horizontal movement interval of the exhaust gas is short. For this reason, light and small particles are easily carried into the flue 4, 5, 6 by being carried to the exhaust gas without being deposited in the horizontal flue 3. For this reason, in Example 1, it is thought that dust other than copper components, such as lead sulfate with a particle size of 10 micrometers or less, was contained in exhaust gas more than Example 2, and according to Example 1, copper components can be separated and recovered efficiently. ing.

  According to the particle size distribution of the residue after leaching dilute sulfuric acid of dust shown in FIG. 5, particles having a particle size of 50 μm or more can be seen despite leaching dust composed of particles of 50 μm or less. This is presumably because fine particles with a large particle size were dissolved by leaching with dilute sulfuric acid, and the existence ratio of large particles was increased.

Next, with respect to Example 1 and Example 2, (1) Dust collected by an electrostatic precipitator, (2) Residue after acid leaching of dust from beaker test, (3) Residue before sending to lead recovery process (Lead Chemical analysis was carried out. Table 5 shows the chemical analysis results of the dust of Example 2. Table 6 shows the chemical analysis results of the dust of Example 1. Table 7 shows the chemical analysis results of the beaker test leaching residue of Example 2. Table 8 shows the chemical analysis results of the beaker test leaching residue of Example 1. Table 9 shows the chemical analysis results of the lead iron of Example 2. Table 10 shows the chemical analysis results of the lead iron of Example 1.

  (1) Regarding the chemical analysis result of the dust passing through the rising flue, the Cu quality, which was 19.8% in Example 2, was 18.6% in Example 1. Cu in the dust passing through the rising flue is reduced by 1.2% in terms of Cu quality compared to Example 2, and by 6.1% in terms of weight.

  (2) Regarding the result of chemical analysis of the residue after acid leaching with a beaker, the quality of Cu in Example 1 was reduced by 3.1% compared to Example 2, and reduced by 14.4% in terms of weight. become. In an actual actual machine, the lead soot after leaching with dilute sulfuric acid is further passed through a wet classifier, and the Cu quality is lower than the analytical value obtained here.

(3) About the chemical analysis result of the lead soot before sending it to the lead recovery process, Example 1 has a Cu quality of 4.5% compared to Example 2, and Cu ₂ S-derived Cu is 27.3% in terms of weight. This corresponds to the reduction.

  From the particle size distribution and the chemical analysis results described above, in Example 1 where the rising flue is increased, the dust having a large particle size in the exhaust gas flowing into the rising flue is reduced, so that dust, leaching residue of dust, lead soot Among the chemical analysis values, the value of Cu decreased.

Next, the ratio of Cu compound in the dust was calculated by calculating the leaching rate of Cu. Cu compounds in the dust are Cu ₂ S and CuSO ₄ , Cu ₂ S is hardly soluble, and CuSO ₄ is soluble, so that the leaching Cu can be considered to be derived from CuSO ₄ . That is, the leaching rate indicates the proportion of Cu Cu derived from CuSO _{4 in} the recovered copper Cu. Here, in both Example 1 and Example 2, 250 g of dust was dissolved in 625 mL of 40 g / L sulfuric acid (the sulfuric acid concentration in the solution after leaching was 15 g / L, the slurry concentration was 250 g / L), and the amount of Cu before and after leaching was determined. Thus, in Example 2, the Cu leaching rate was 39.2%, and in Example 1, the Cu leaching rate was 49.5%. Therefore, it was found that the ratio of Cu ₂ S in Example 1 was lower than that in Example 2. This is because Cu ₂ S or metal copper, which is heavier than CuSO ₄ and has a larger particle diameter, falls into the horizontal flue 3, thereby reducing Cu ₂ S in the dust.

  As described above, in the recovery device 1 according to the first embodiment, the flow rate of the exhaust gas flowing into the rising flue is lower than that in the second embodiment, so that the copper sulfide or metal copper having a larger particle size contained in the exhaust gas is horizontal. It can be dropped into the flue 3. Thereby, copper sulfide or metal copper having a large particle size can be easily separated from the exhaust gas, and copper can be efficiently recovered. In addition, when the gas flow rate in the rising flue is 8 m / s, copper sulfide of about 70 μm or more can be dropped into the horizontal flue, and considering that the specific gravity of metal copper is larger than that of copper sulfide, It can be judged that most of the copper can be recovered. On the other hand, when the gas flow rate in the rising flue is 3 m / s, most of the copper sulfide of 10 μm or more is expected to be recovered, and other than copper compounds such as lead sulfate having a particle size of about several μm (10 μm or less). Dust is sucked from the flue, and the copper component can be efficiently separated and recovered from the horizontal flue. Therefore, the gas flow rate in the rising flue is preferably 3 m / s to 8 m / s. As a specific numerical value, by increasing the number of rising flues from 2 to 3, the Cu quality in the lead soot after copper recovery is reduced by 4.5%, and 89 tons of copper per year is not sent to the lead recovery process. It can be sent to the smelting process, and processing costs can be reduced.

  In the present invention, the channel area of the rising flue can also be expanded. FIG. 6 is an explanatory view of a copper recovery device (hereinafter simply referred to as “recovery device”) 10 contained in the exhaust gas dust of another configuration of the present invention. The collection device 10 has substantially the same configuration as the collection device 100 of the second embodiment. However, it differs from the recovery device 100 of the second embodiment in that the flow passage areas of the rising flues 14 and 15 are expanded. The other configuration of the recovery device 10 is the same as that of the recovery device 100 of the second embodiment, and the same components as those of the recovery device 1 are denoted by the same reference numerals in the drawings, and detailed description thereof will be given. Omitted.

  Also in this recovery device 100, the flow rate of the rising flues 14 and 15 is expanded, so that the flow rate of the exhaust gas flowing into the rising flues 14 and 15 decreases. Thereby, the copper sulfide with a large particle size contained in exhaust gas falls in the horizontal flue 3, and a copper sulfide with a large particle size is easily isolate | separated from exhaust gas, and copper can be collect | recovered efficiently. Thereby, the processing cost in post-processing can be reduced, without sending the copper sulfide removed from exhaust gas to post-processing.

  The above-described embodiments are merely examples for carrying out the present invention, and the present invention is not limited thereto. Various modifications of these embodiments are within the scope of the present invention. It is apparent from the above description that various other embodiments are possible within the scope.

  For example, a mechanism may be provided in which a fan or a propeller is installed to reduce the flow rate of exhaust gas flowing into the rising flue. Moreover, a present Example can be employ | adopted about the metal collect | recovered by the same operation method, without being limited to a copper converter.

1 Recovery device of copper contained in exhaust gas dust 2a, 2b, 2c, 2d Converter 3 Horizontal flue 4, 5, 6 Standing flue 7 Floor conveyor

Claims (18)

In a flue comprising a first flue through which exhaust gas discharged from a copper smelting converter flows, and a second flue connected downstream of the first flue,
A method for recovering copper, characterized in that the gas flow rate in the second flue is lowered than the gas flow rate in the first flue.   2. The copper recovery method according to claim 1, wherein the second flue is connected to a ceiling portion of the first flue and is inclined vertically upward from the extending direction of the second flue.   3. The copper recovery method according to claim 1, wherein a gas flow rate in the second flue is 3 m / s to 8 m / s.   The said 1st flue is installed horizontally, The copper collection | recovery method in any one of Claims 1-3 characterized by the above-mentioned.   The copper recovery method according to claim 1, wherein the second flue extends vertically upward.   The said exhaust gas contains the copper sulfide and / or metal copper with a particle size of 10 micrometers or more, The copper collection | recovery method in any one of Claims 1-5 characterized by the above-mentioned. A first flue through which exhaust gas discharged from a copper smelting converter flows,
One or more second flues connected to the ceiling of the first flues and inclined vertically upward from the extending direction of the first flues,
The copper recovery apparatus, wherein a total cross-sectional area of the one or more second flues is larger than a cross-sectional area of the first flues.   The copper recovery apparatus according to claim 7, wherein a total cross-sectional area of the one or more second flues is 1.7 times or more of a cross-sectional area of the first flues.   8. The copper recovery apparatus according to claim 7, wherein the total cross-sectional area of the one or more second flues is at least twice the cross-sectional area of the first flues.   The copper recovery apparatus according to claim 7, wherein a total cross-sectional area of the one or more second flues is 2.5 times or more a cross-sectional area of the first flues.   The copper recovery apparatus according to any one of claims 7 to 10, wherein a dust recovery device is installed at the bottom of the first flue.   The said 1st flue is connected to the said some converters, The copper collection | recovery apparatus in any one of Claims 7-11 characterized by the above-mentioned. The flues from the plurality of converters are respectively connected at different connection points of the first flues,
The said 2nd flue is connected between these connection locations in the said 1st flue, The copper collection | recovery apparatus of Claim 12 characterized by the above-mentioned.   14. The copper recovery apparatus according to claim 7, wherein each cross-sectional area of the second flue is larger than a cross-sectional area of the first flue.   The copper recovery device according to any one of claims 7 to 14, wherein a flow rate of the exhaust gas in the second flue is 3 to 8 m / s.   The said 1st flue is installed horizontally, The copper collection | recovery apparatus in any one of Claims 7-15 characterized by the above-mentioned.   The copper recovery apparatus according to claim 7, wherein the second flue extends vertically upward.   The said 2nd flue is connected to the dust collector downstream in the flow direction of the said exhaust gas, The copper collection | recovery apparatus in any one of Claims 7-17 characterized by the above-mentioned.

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