Method for producing copper-containing substance

Abstract

To provide a technique capable of setting concentration of copper to high concentration, in reduction melting of incineration ash.SOLUTION: A method for producing a copper-containing substance using a reduction melting furnace having a melting furnace body having a bottomed cylindrical shape, and an electrode liftably provided inside the melting furnace body, in which the melting furnace body has a recess that is formed in a furnace bottom and where a first molten metal layer having a content of copper of 65 mass% or more is accumulated, and a tap hole provided vertically above the recess on the side face part, includes: a first step of reduction melting incineration ash containing copper, and thereby separating it into a first molten metal layer, a second molten metal layer which is produced on an upper layer of the first molten metal layer and has a content of copper of less than 65 mass%, and a slag layer produced on the upper layer of the second molten metal layer; a second step of taking out the slag layer and the second molten metal layer from the tap hole; and a third step of lowering the electrode and pushing it into the first molten metal layer, and thereby overflowing and taking out the first molten metal layer from the tap hole.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a method for producing a copper-containing material. [Background technology]

[0002] Conventionally, a method for recovering valuable metals from incineration ash containing metals using a reducing melting furnace has been proposed (for example, Patent Document 1). Metal components reduced in a reducing melting furnace are recovered as molten metal or molten fly ash. Patent Document 1 discloses that the molten metal located below the molten slag contains high boiling point components such as iron and copper. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-249711 A Summary of the Invention [Problem to be solved by the invention]

[0004] The technology of Patent Document 1 is an excellent technology as a metal recovery method in the reduction and melting of incineration ash, but there is room for improvement in terms of increasing the copper concentration. For this reason, a manufacturing technology that increases the copper concentration in the reduction and melting of incineration ash is required. [Means for solving the problem]

[0005] The present disclosure can be realized in the following forms.

[0006] (1) According to one embodiment of the present disclosure, a method for producing a copper-containing material is provided, which uses a reducing melting furnace including a bottomed cylindrical melting furnace body and an electrode provided inside the melting furnace body so as to be movable up and down, the melting furnace body having a recess formed in the bottom of the furnace, in which a first molten metal layer having a copper content of 65% or more is accumulated, and a tapping port provided vertically above the recess in a side portion, and includes a first step of reducing and melting copper-containing combustion ash to separate the first molten metal layer, a second molten metal layer having a copper content of less than 65% by mass and formed above the first molten metal layer, and a slag layer formed above the second molten metal layer, a second step of removing the slag layer and the second molten metal layer from the tapping port, and a third step of lowering the electrode and pushing it into the first molten metal layer to overflow and remove the first molten metal layer from the tapping port. According to this form of manufacturing method for copper-containing material, a first molten metal layer is accumulated in a recess formed in the bottom of the furnace, and an electrode is lowered and pushed into the first molten metal layer, causing the first molten metal layer to overflow and be removed from a tapping port provided vertically above the recess, thereby achieving a high copper concentration.

[0007] (2) In the method for producing a copper-containing material described in (1) above, a volume of the recess may be 10% or more and 20% or less of a volume of the melting furnace body. According to this embodiment of the method for producing a copper-containing material, a decrease in recovery efficiency of the copper-containing material can be suppressed.

[0008] (3) In the method for producing a copper-containing material according to the above (1) or (2), the depth of the recess may be 250 mm or more and 400 mm or less. According to this embodiment of the method for producing a copper-containing material, a decrease in recovery efficiency of the copper-containing material can be suppressed.

[0009] (4) In the method for producing a copper-containing material according to any one of (1) to (3) above, the slag layer, the second molten metal layer, and the first molten metal layer taken out from the tapping hole may be gravity-separated in a tiltable ladle. According to this embodiment of the method for producing a copper-containing material, the slag layer, the second molten metal layer, and the first molten metal layer taken out from the tapping hole are gravity-separated, so that a decrease in recovery efficiency when each layer is separated and recovered can be suppressed.

[0010] (5) In the method for producing a copper-containing material according to any one of (1) to (4), the reducing melting furnace may be a submerged arc furnace. According to this form of the method for producing a copper-containing material, the copper concentration can be increased in the reducing melting using the submerged arc furnace.

[0011] The present disclosure can be realized in various forms, for example, in the form of an apparatus for producing a copper-containing material, a method for recovering a copper-containing material from incineration ash, etc. [Brief description of the drawings]

[0012] [Figure 1] Schematic diagram showing the schematic configuration of an apparatus used in a method for producing a copper-containing material [Diagram 2] FIG. 2 is a process diagram showing a method for producing a copper-containing material. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A. Equipment configuration 1 is a schematic diagram showing a schematic configuration of a reducing melting furnace 10 used in a method for producing a copper-containing material according to an embodiment of the present disclosure. The reducing melting furnace 10 melts incineration ash containing metals such as iron and copper under a reducing atmosphere. The incineration ash is obtained, for example, by incinerating general waste, industrial waste, etc. in an incineration facility.

[0014] The furnace for reducing melting 10 includes a melting furnace body 20, a furnace cover 30, and electrodes 40. The furnace for reducing melting 10 of this embodiment is a submerged arc furnace. Note that Fig. 1 shows an example of the configuration of the furnace for reducing melting 10. Note that Fig. 1 is merely a schematic diagram, and the dimensional relationship of the device and the like differ from the actual one.

[0015] The melting furnace body 20 has a cylindrical exterior shape with a bottom, and has a furnace bottom 22 and a side portion 24. In this embodiment, the side portion 24 is formed in a cylindrical shape. The inner diameter of the melting furnace body 20 is not particularly limited, but is preferably 2.0 m or more and 5.0 m or less, and more preferably 3.0 m or more and 4.0 m or less. The depth of the melting furnace body 20 is not particularly limited, but is preferably 1.0 m or more and 4.0 m or less, and more preferably 1.5 m or more and 2.5 m or less. The volume of the melting furnace body 20 is not particularly limited, but is preferably 5 m or more. 3 More than 30m 3 Preferably less than 10m 3 More than 20m 3 It is more preferable that the following is true: A detailed description of the configuration of the melting furnace body 20 will be given later.

[0016] The furnace lid 30 covers the top of the melting furnace body 20. The furnace lid 30 is provided with a raw material inlet 32 ​​and an exhaust gas pipe 34. The raw material inlet 32 ​​receives the incineration ash 72 carried by the screw feeder 180 into the inside of the melting furnace body 20. The incineration ash 72 may be supplied by a belt conveyor or the like, not limited to the screw feeder 180. The exhaust gas pipe 34 discharges the exhaust gas in the melting furnace body 20 and the molten fly ash generated by the reduction melting. The discharged molten fly ash is captured and collected by a bag filter, an electric dust collector, or the like (not shown) connected to the exhaust gas pipe 34.

[0017] The electrode 40 is provided so as to be movable up and down inside the melting furnace body 20. The electrode 40 is raised and lowered by an electrode raising and lowering device (not shown). The electrode 40 is raised and lowered to adjust the melting power and the current. In this embodiment, the electrode 40 is lowered when the first molten metal layer 91 described later is tapped. The electrode 40 in this embodiment is formed of a carbon electrode and is provided so as to penetrate the furnace cover 30 and hang down. The reducing melting furnace 10 in this embodiment is provided with three electrodes 40. The three electrodes 40 are arranged so as to be located at the vertices of an equilateral triangle when viewed from above. The electrode 40 in this embodiment is connected to a three-phase AC power source 190, but may be connected to any power source such as a single-phase AC power source or a DC power source. The number of electrodes 40 is not particularly limited, but in a mode in which the electrodes are connected to the three-phase AC power source 190, it is preferable that the number is a multiple of three, such as three or six. The thickness (diameter) of the electrode 40 is not particularly limited, but from the viewpoint of ensuring the volume of the electrode 40 to be pushed into the first molten metal layer 91, it is preferably 10 inches or more, more preferably 20 inches or more, and from the same viewpoint, it is preferably 1 / 10 or more, more preferably 1 / 8 or more, and even more preferably 1 / 7 or more of the inner diameter of the melting furnace body 20. From the viewpoint of design constraints in the reducing melting furnace 10, the thickness of the electrode 40 is preferably 40 inches or less, more preferably 30 inches or less, and from the same viewpoint, it is preferably 1 / 3.5 or less, more preferably 1 / 4 or less, and even more preferably 1 / 4.5 or less of the inner diameter of the melting furnace body 20.

[0018] In the reducing melting furnace 10, the incineration ash 72 is reduced and melted by applying electricity to the electrodes 40 and heating them. In order to melt the incineration ash 72 in a reducing atmosphere, it is preferable that a reducing agent 74 is introduced into the melting furnace body 20 together with the incineration ash 72. The reducing agent 74 is not particularly limited, but is preferably a substance containing carbon as a main component, such as coke. The reducing agent 74 is not limited to coke, and may be a mixture of, for example, garbage carbide powder obtained from combustible garbage, or may be a carbide-infused pellet mixed with garbage carbide and fly ash. When the incineration ash 72 is reduced and melted, a slag layer 80 is formed on the upper layer, and a molten metal layer 90 is formed on the lower layer. Then, the incineration ash 72 and the reducing agent 74 that have not yet melted float on the slag layer 80.

[0019] In the method for producing a copper-containing material in the present disclosure, as described below, a first molten metal layer 91 having a high copper content and a second molten metal layer 92 having a low copper content are separated and recovered from a molten metal layer 90 produced by reduction melting. In the present disclosure, the "first molten metal layer 91" means a molten metal layer 90 containing copper as a main component and having a copper content of 65 mass% or more. The first molten metal layer 91 corresponds to the "copper-containing material" in the present disclosure. The copper content in the first molten metal layer 91 is preferably 66 mass% or more, more preferably 68 mass% or more, even more preferably 70 mass% or more, and even more preferably 72 mass% or more. In the present disclosure, the "second molten metal layer 92" means a molten metal layer 90 containing less than 65 mass% copper. The second molten metal layer 92 preferably contains less than 50 mass% copper and is mainly composed of iron. Since the second molten metal layer 92 has a lower specific gravity than the first molten metal layer 91, it is generated above the first molten metal layer 91. The copper content can be analyzed using an energy dispersive X-ray fluorescence analyzer (EDX).

[0020] The melting furnace body 20 has a recess 26 and a tapping port 28. The recess 26 is formed in the furnace bottom 22. The first molten metal layer 91 accumulates in the recess 26. The depth of the recess 26 is not particularly limited, but from the viewpoint of ensuring a settling distance and increasing the efficiency of separation between the first molten metal layer 91 and the second molten metal layer 92, it is preferably 200 mm or more, more preferably 250 mm or more, and even more preferably 300 mm or more. In addition, from the viewpoint of suppressing an excessive increase in the load of the reducing melting furnace 10, the depth of the recess 26 is preferably 500 mm or less, more preferably 450 mm or less, and even more preferably 400 mm or less. The depth of the recess 26 may be, for example, 250 mm or more and 400 mm or less. The volume of recess 26 is not particularly limited, but is preferably 5% to 25% and more preferably 10% to 20% of the volume of melting furnace body 20 from the viewpoint of suppressing a decrease in the recovery efficiency of first molten metal layer 91. The size (cross-sectional area and inner diameter) of recess 26 in a direction perpendicular to the depth direction may be the same as that of melting furnace body 20, or may be smaller than that of melting furnace body 20.

[0021] The tapping port 28 is provided on the side portion 24 near the hearth 22. The tapping port 28 is provided vertically above the recessed portion 26. The tapping port 28 is configured to be openable and closable, and is normally closed. By opening the tapping port 28 at predetermined intervals, the slag layer 80, the first molten metal layer 91, and the second molten metal layer 92 generated by the reduction melting are discharged to the outside of the melting furnace body 20.

[0022] In this embodiment, a tiltable ladle 50 is installed at the outlet of the tapping hole 28. The ladle 50 is, for example, an iron pot, and has a spout 52 formed at the top. The slag layer 80, the first molten metal layer 91, and the second molten metal layer 92 discharged from the tapping hole 28 are gravity separated in the ladle 50. By gravity separation, the first molten metal layer 91, the second molten metal layer 92, and the slag layer 80 are separated from the bottom vertically. The slag layer 80 floats in a liquid state on the second molten metal layer 92, and is easily collected. The second molten metal layer 92 and the first molten metal layer 91 are collected separately in separate iron pots 60 and the like through the spout 52 by tilting the ladle 50.

[0023] B. Manufacturing method of copper-containing material 2 is a process diagram showing a method for producing a copper-containing material. Prior to the production of a copper-containing material, incineration ash 72 containing copper is prepared. The incineration ash 72 as a raw material may be adjusted in terms of basicity, chlorine content, etc. as necessary. The incineration ash 72 is charged into the melting furnace body 20 (step P100). In step P100, a reducing agent 74 is also charged into the melting furnace body 20 together with the incineration ash 72. The ratio of the amount of the reducing agent 74 to the amount of the incineration ash 72 charged may be appropriately adjusted.

[0024] The copper-containing combustion ash 72 is reduced and melted to separate into a first molten metal layer 91, a second molten metal layer 92 formed on the upper layer of the first molten metal layer, and a slag layer 80 formed on the upper layer of the second molten metal layer 92 (step P110). For convenience, step P110 is also called the "first step". In the first step, an electric arc and electric resistance Joule heat are generated by energizing the electrode 40. As the reduction melting proceeds, the liquid levels of the layers 80, 91, and 92 rise. In the first step, the tapping hole 28 is closed. The first step is continued for a predetermined time. This time may be set according to the volume of the melting furnace body 20, the melting temperature, and the like. The time is not particularly limited, but is preferably 4.5 hours or more and less than 10 hours, more preferably 5 hours or more and less than 6 hours, from the viewpoint of reducing heavy metals to render the slag harmless and from the viewpoint of economy.

[0025] The slag layer 80 and the second molten metal layer 92 are taken out from the tapping port 28 (step P120). For convenience, step P120 is also referred to as the "second step." In the second step, the tapping port 28 is opened, and the second molten metal layer 92, which is located at the same level as or above the tapping port 28 in the vertical direction, and the slag layer 80 are discharged from inside the melting furnace body 20 to the outside. Since the tapping port 28 is provided vertically above the recess 26 in which the first molten metal layer 91 accumulates, in the second step, the first molten metal layer 91 is prevented from flowing out of the tapping port 28.

[0026] In this embodiment, after the second step, the second molten metal layer 92 taken out in the second step is weighed (step P122). Then, it is confirmed whether or not the cumulative discharge amount of the taken out second molten metal layer 92 exceeds a preset amount (step P124). If the cumulative discharge amount of the second molten metal layer 92 does not reach the preset amount (step P124: NO), the process returns to step P100. On the other hand, if the cumulative discharge amount of the second molten metal layer 92 exceeds the preset amount (step P124: YES), the process proceeds to step P130. Note that the above "cumulative discharge amount" refers to the total amount of the second molten metal layer 92 taken out in the steps P100 to P120 that are repeated multiple times. The set amount is not particularly limited, but from the viewpoint of increasing the efficiency of separation between first molten metal layer 91 and second molten metal layer 92, it is preferably 0.8 times or more, more preferably 1.0 times or more, and even more preferably 1.2 times or more of the mass of second molten metal layer 92 corresponding to the volume of recess 26. Moreover, from the viewpoint of suppressing a decrease in the recovery efficiency of first molten metal layer 91, the set amount is preferably 2.5 times or less, more preferably 2.0 times or less, and even more preferably 1.7 times or less of the mass of second molten metal layer 92 corresponding to the volume of recess 26.

[0027] The electrode 40 is lowered and pushed into the first molten metal layer 91, so that the first molten metal layer 91 overflows and is taken out from the tapping port 28 (step P130). For convenience, step P130 is also called the "third step". As described above, the electrode 40 is configured to be movable up and down. In the first and second steps, the tip of the electrode 40 does not reach the first molten metal layer 91. In the third step, the electrode 40 is lowered and the tip of the electrode 40 is pushed into the first molten metal layer 91, so that the liquid level of the first molten metal layer 91 rises, so that the first molten metal layer 91 overflows from the tapping port 28. The third step is performed in a state where the current to the electrode 40 is stopped. The third step may be performed continuously from the state where the tapping port 28 is opened in the second step. The molten metal layer 91 taken out from the tapping hole 28 has a copper content of 65 mass % or more and is a high-quality copper-containing material.

[0028] In this embodiment, the slag layer 80 and the second molten metal layer 92 taken out in the second step and the first molten metal layer 91 taken out in the third step are gravity separated in the ladle 50. By performing gravity separation in the ladle 50, it is possible to suppress a decrease in recovery efficiency when the layers 80, 91, and 92 are separated and recovered. Completion of the third step (step P130) completes the production of the copper-containing material. Note that after completion of step P130, the process may be returned to step P100 to continuously produce the copper-containing material.

[0029] According to the method for producing a copper-containing material of this embodiment described above, a first molten metal layer 91 having a high copper content is generated in the recess 26 formed in the hearth 22, and then the electrode 40 is lowered and pushed into the first molten metal layer 91, causing the first molten metal layer 91 to overflow and be removed from the tapping hole 28. This makes it possible to prevent the separated first molten metal layer 91 and second molten metal layer 92 from mixing with each other, and as a result, a high-quality copper-containing material can be recovered.

[0030] In the manufacturing method of this embodiment, the first molten metal layer 91 is discharged from the tapping port 28 that discharges the slag layer 80 and the second molten metal layer 92. Therefore, the tapping port 28 can be used for both purposes, and it is not necessary to provide a separate recovery port for recovering the first molten metal layer 91 near the hearth 22. If a separate recovery port for recovering the first molten metal layer 91 is provided, the recovery port may become clogged and the molten metal may not be able to be tapped if the frequency of tapping the first molten metal layer 91 is low. However, in the manufacturing method of this embodiment, the first molten metal layer 91 is tapped using the tapping port 28 that is opened and closed every time the slag layer 80 and the second molten metal layer 92 are discharged, so that the tapping port 28 can be prevented from being clogged even if the frequency of tapping the first molten metal layer 91 is low.

[0031] Furthermore, in the manufacturing method of this embodiment, the liquid level of first molten metal layer 91 is raised by using electrode 40 that is configured to be able to rise and fall in order to adjust the melting power and current. Therefore, electrode 40 can also serve as a component for raising the liquid level of first molten metal layer 91 to cause it to overflow from tapping port 28, and it is unnecessary to provide a separate component for raising the liquid level of first molten metal layer 91. As a result, the configuration of the device can be prevented from becoming complicated, and therefore an increase in the manufacturing cost of the device and the number of steps required for maintenance can be prevented.

[0032] Furthermore, in the method for producing a copper-containing material of the present embodiment, only when the cumulative discharge amount of second molten metal layer 92 exceeds a preset amount, electrode 40 is lowered to cause first molten metal layer 91 to overflow from tapping port 28. In this manner, first molten metal layer 91 and second molten metal layer 92 are separated, and first molten metal layer 91 can be tapped after a predetermined amount of first molten metal layer 91 has accumulated in recess 26, thereby suppressing a decrease in the recovery efficiency of first molten metal layer 91.

[0033] C. Variations: The configuration of the device used in the manufacturing method of the copper-containing material according to the above embodiment is merely an example, and can be modified in various ways. For example, the reducing melting furnace 10 is not limited to a submerged arc furnace, and may be an electric melting furnace (such as an AC arc melting furnace, an AC electric resistance melting furnace, or a DC electric resistance melting furnace) that melts the material using electric energy. Also, for example, the ladle 50 may be omitted.

[0034] Moreover, each step in the manufacturing method of the copper-containing material of the above embodiment is merely an example and can be modified in various ways. For example, step P122 and step P124 may be omitted. Also, for example, instead of step P122 and step P124, the process may proceed to step P130 if a predetermined arbitrary condition is satisfied, such as whether a predetermined period of time has elapsed, and may return to step P100 if the condition is not satisfied. EXAMPLES

[0035] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples. In the following description, the "high-grade metal" has a copper content of 65 mass% or more and corresponds to the first molten metal layer 91 in the above embodiment, and the "molten metal" corresponds to the second molten metal layer 92 in the above embodiment.

[0036] The reduction melting furnace has a diameter of 3.3m, a depth of 1.8m, and a volume of 15.4m 3 The experiment was carried out using an AC submerged electric furnace. The reducing melting furnace was equipped with three carbon electrodes arranged at the vertices of an equilateral triangle when viewed from above as liftable electrodes. The three electrodes were connected to a three-phase AC power source. In addition, as the reducing melting furnace of Examples 1 and 2, a reducing melting furnace was used in which a recess with a depth of 300 mm was formed in the bottom of the furnace and a tapping port was provided vertically above the recess. As the reducing melting furnace of the comparative example, a reducing melting furnace was used in which the recess in the bottom of the furnace was omitted and a tapping port was provided near the bottom of the furnace.

[0037] The raw material incineration ash was waste incineration ash, with the slag basicity adjusted to 0.7-1.0. The ratio of coke to incineration ash was controlled to 1-4%. The chlorine content was controlled to 2-30%. The melting temperature was 1300°C-1500°C. The refining time (melting time) from the tapping of molten metal to the next tapping of molten metal was 4.5 hours or more, and new raw materials were added each time molten metal was tapped. The maximum voltage was 275V, and the current was 10,000A.

[0038] The refining operation (melting process) was continued for one month. Each time the molten metal was tapped, the molten metal was weighed and the composition of the molten metal was analyzed. The copper content of the molten metal was determined for each tap. An EDX7000 fluorescent X-ray analyzer (manufactured by Shimadzu Corporation) was used for the composition analysis. In Examples 1 and 2, the electrode was lowered every time the cumulative amount of molten metal discharged reached about 30 tons, and the high-grade metal accumulated in the recess of the hearth was forcibly tapped. In Examples 1 and 2, the number of times the high-grade metal was tapped by lowering the electrode was two times each in one month of refining operation. In the comparative example, the electrode was not lowered to tap the high-grade metal.

[0039] The percentage of the obtained high-grade metal was determined. The percentage of the high-grade metal (%) was calculated by dividing the total mass of the high-grade metal discharged in one month of refining operation by the total mass of the incineration ash (the amount of incineration ash processed) input in one month of refining operation and multiplying by 100. The results are shown in Table 1. In Table 1, "molten metal discharge interval (t)" means the cumulative discharge amount of the molten metal discharged from one electrode drop to the next electrode drop, "maximum Cu content (%)" means the copper content (maximum value of the copper content in the molten metal) in the tapping with the highest copper content among the multiple tappings of the molten metal, and "average Cu content (%)" means the average value of the copper content contained in the molten metal in the multiple tappings of the molten metal. In the comparative example, the tapped molten metal with a copper content of 65 mass% or more was defined as "high-grade metal".

[0040] [Table 1]

[0041] From the results shown in Table 1, the following was found. In the comparative example, in which the recess was omitted and the electrode was not lowered, the discharge rate of high-grade metal relative to the amount of incineration ash processed was extremely low, at 0.07%. Furthermore, in the comparative example, the average Cu content (%) tended to be higher than in the examples, and the maximum Cu content (%) was very high, at 22.6%. These findings suggest that in the comparative example, copper does not concentrate and copper flows out into the molten metal.

[0042] In contrast, in Examples 1 and 2, the ratio of high-grade metal discharged to the amount of incineration ash processed was high, at 0.28% to 0.35%. In Examples 1 and 2, the high-grade metal and the molten metal were separated, and the high-grade metal was stored in a recess in the reducing melting furnace, and then the high-grade metal was overflowed by lowering the electrodes and tapped from the tapping hole. By doing so, it was possible to prevent the high-grade metal and the molten metal, which had been separated into two layers, from mixing, and as a result, it is believed that a large amount of high-grade metal was recovered.

[0043] The present disclosure is not limited to the above-mentioned embodiment, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features in each embodiment corresponding to the technical features in each form described in the Summary of the Invention column can be appropriately replaced or combined in order to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if the technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0044] 10... reduction melting furnace, 20... melting furnace body, 22... furnace bottom, 24... side portion, 26... recess, 28... tapping hole, 30... furnace cover, 32... raw material inlet, 34... exhaust gas pipe, 40... electrode, 50... ladle, 52... spout, 60... iron pot, 72... incineration ash, 74... reducing agent, 80... slag layer, 90... molten metal layer, 91... first molten metal layer, 92... second molten metal layer, 180... screw feeder, 190... three-phase AC power source

Claims

1. A method for producing a copper-containing material, comprising the steps of: A reducing melting furnace is used, which includes a bottomed cylindrical melting furnace body and an electrode that is arranged to be raised and lowered inside the melting furnace body, The melting furnace body is a recess formed in the bottom of the furnace, the recess being adapted to receive a first molten metal layer having a copper content of 65% by mass or more; a tapping port provided vertically above the recess in the side portion; having A first step of reducing and melting incineration ash containing copper to separate the incineration ash into the first molten metal layer, a second molten metal layer having a copper content of less than 65% by mass and formed on the upper layer of the first molten metal layer, and a slag layer formed on the upper layer of the second molten metal layer; a second step of removing the slag layer and the second molten metal layer from the tap hole; a third step of lowering the electrode and forcing it into the first molten metal layer, thereby causing the first molten metal layer to overflow and be removed from the tap hole; A method for producing a copper-containing material, comprising:

2. The method for producing a copper-containing material according to claim 1, The volume of the recess is 10% to 20% of the volume of the melting furnace body. A method for producing copper-containing materials.

3. The method for producing a copper-containing material according to claim 1 or 2, The depth of the recess is 250 mm or more and 400 mm or less. A method for producing copper-containing materials.

4. The method for producing a copper-containing material according to claim 1 or 2, The slag layer, the second molten metal layer, and the first molten metal layer taken out from the tap hole are gravity separated in a tiltable ladle. A method for producing copper-containing materials.

5. The method for producing a copper-containing material according to claim 1 or 2, The reduction melting furnace is a submerged arc furnace. A method for producing copper-containing materials.

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