A production process for removing copper and zinc by liquid after washing copper strip and a deep copper removal device

Abstract

The invention discloses a production process for removing copper and zinc from a washed copper strip liquid and a deep copper removal device, and relates to the technical field of copper strip washing. S1: filtering the washed liquid once to remove insoluble impurities, and returning the filter residue to a brass furnace; S2: passing the filtered liquid into a cyclone electrowinning device for preliminary copper removal to obtain an electrowinning liquid and copper flakes, and stopping copper removal after the copper is removed to 0.4-0.6 g / L; S3: passing the filtered electrowinning liquid into a hydrogen sulfide sulfidation copper removal device for deep copper removal, adopting a two-step copper removal process; S4: filtering the deeply copper-depleted solution, returning the filter residue to the brass furnace, and entering the electrowinning zinc removal device for zinc removal to obtain zinc flakes and a dezincified liquid, and returning the dezincified liquid to the copper strip washing process; the deep copper removal device can prevent the generated precipitation from covering the aeration pipe at the bottom of the tank body, thereby preventing the aeration rate from being unstable, and can also reduce the copper sulfide particles in the electrowinning liquid, increase the contact area between the hydrogen sulfide gas and the electrowinning liquid, and thus accelerate the reaction.

Description

Technical Field

[0001] The present invention relates to the technical field of copper plate and strip cleaning, and in particular to a production process for copper plate and strip liquid decoppering and zinc removal after washing, and a deep decoppering device. Background Art

[0002] Surface quality control for copper and copper alloy plates and strips involves every step of the production process. Among these, intermediate and finished strip cleaning is the most crucial step in improving strip surface quality. Strip cleaning is primarily performed on automated continuous cleaning machines, encompassing degreasing, pickling, brushing and grinding, passivation, and drying. The pickling process generates a significant amount of waste acid, which can contain valuable metals such as copper and zinc.

[0003] In order to improve the economic benefits of enterprises and reduce the pollution of waste acid discharge to the environment, it is of great significance to recover valuable metals such as copper and zinc in the liquid after copper strip washing. Therefore, a production process for removing copper and zinc from the liquid after copper strip washing is provided to solve this problem. Summary of the Invention

[0004] The purpose of this application is to provide a production process for removing copper and zinc by liquid after washing of copper plates and strips and a deep copper removal device to solve the problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a production process for removing copper and zinc from a copper strip after washing, the steps of which are as follows:

[0006] S1: The washed liquid is filtered once to remove insoluble impurities, and the filter residue is returned to the brass furnace;

[0007] S2: The filtrate is passed into a cyclone electrowinning device for preliminary copper removal to obtain electrowinning liquid and copper flakes. After the copper is removed to 0.4-0.6 g / L, the copper removal is stopped. The copper is removed to between 0.4-0.6 g / L. If the electrowinning is continued at this time, hydrogen will be generated, which is unsafe.

[0008] S3: The filtered post-electrolytic solution is passed into a hydrogen sulfide sulfide copper removal device for deep copper removal. A two-step sulfide copper removal method is used. The two-step sulfide copper removal method can reduce the amount of hydrogen sulfide used and improve the efficiency of sulfide copper removal. On the other hand, the hydrogen sulfide gas can be dispersed into two copper removal devices for sulfide copper removal, avoiding excessive hydrogen sulfide consumption in a single device and improving safety.

[0009] S31: decoppering once, introducing hydrogen sulfide in an amount of 1.5 to 3 times the theoretical value, at room temperature, while stirring, and the reaction time is 45 to 75 minutes;

[0010] S32: Secondary decoppering, introducing hydrogen sulfide in an amount of 3 to 5 times the theoretical value, at room temperature, while stirring, the reaction time is 80 min to 120 min;

[0011] S4: The solution after deep decoppering is filtered, and the filter residue is returned to the brass furnace. The filtrate enters the electrolytic dezincification equipment for dezincification treatment to obtain zinc flakes and dezincified liquid. Dezincification is stopped after the zinc is removed to 12-18g / L, and the dezincified liquid returns to the copper plate and strip cleaning process. At this concentration, on the one hand, the dezincified liquid can be used for copper plate and strip cleaning normally without affecting product quality. At the same time, the zinc ion concentration still has enough enrichment space, and there is no need for frequent dezincification. On the other hand, continued dezincification will reduce electrical efficiency and poor safety.

[0012] Preferably, in S2, the anode of the cyclone electrowinning device is an iridium-plated titanium rod, the cathode is a titanium sheet, the electrolyte flow rate is 50 to 300 L / min, and the current density is 100 to 200 A / m 2 Under this condition, the electrical efficiency is high and the quality of the electrical copper is good.

[0013] Preferably, in S3, the hydrogen sulfide can be purchased from outside or prepared on-site using a sulfiding agent, and the sulfiding agent can be one or more of sodium sulfide, sodium hydrosulfide, zinc sulfide or barium sulfide.

[0014] Preferably, in S4, the electrolytic dezincification current density is 400-600 A / m 2 Under this condition, the electrical efficiency is high and the quality of electrolytic zinc is good.

[0015] A deep copper removal device comprises a first reaction tank and a second reaction tank, two filter units arranged at intervals, and a spray power unit. The two liquid inlet ends of the two filter units are connected to the liquid outlet ends of the first reaction tank and the second reaction tank respectively through two connecting pipes. Both connecting pipes are equipped with a liquid pump. The liquid outlet ends of the filter units are connected to a two-way pipe. The two branches of the two-way pipe are arranged obliquely downward and are each equipped with a first electric valve. The two branches of the two-way pipe on the left are connected to the first reaction tank and the second reaction tank respectively, and the two branches of the two-way pipe on the right are connected to the second reaction tank and the liquid inlet end of the electrolytic dezincification equipment respectively.

[0016] The inner cavities of the first and second reaction tanks are both provided with spiral aeration pipes and stirring systems. The air inlet pipes of the two aeration pipes are respectively located outside the first and second reaction tanks. The inner cavities of the first and second reaction tanks are both installed with first water distribution trays, and the bottoms of the first water distribution trays are densely covered with atomizing nozzles. The outer surface of the first water distribution tray forms a seal with the inner wall of the tank. The liquid inlet end of the first water distribution tray is connected to one of the branch pipes extending into the inner cavity of the tank. The first reaction tank is provided with a liquid inlet pipe of an automatic second electric valve, and the lower end of the liquid inlet pipe is sealed and passes through the first water distribution tray. One of the branch pipes of the left-side two-way pipe is sealed and passes through the second reaction tank and the first water distribution tray located in its inner cavity.

[0017] The spray power unit includes two mounting tubes respectively mounted on the two-way tube, the branch tube and the connecting tube, and a driving rod rotatably mounted on the mounting tubes. Impellers are rotatably mounted in the inner cavities of the two mounting tubes through a cross. Gears are mounted on the rotating shafts of the two impellers and on both ends of the driving rods. Adjacent gears are meshed and connected, and the adjacent gears are mounted in a protective cover.

[0018] The filter unit includes a shell with a filter layer and a second water distribution tray inside. A liquid receiving tank is installed inside the shell. The upper end of the two-way pipe is connected to the liquid receiving tank. The upper end of the connecting pipe is connected to the liquid inlet end of the second water distribution tray. The lower end of the second water distribution tray is provided with several liquid outlet pipes.

[0019] Preferably, the filter layer includes a first filter segment and a second filter segment that are arranged in a ring shape and connected to each other. The first filter segment and the second filter segment are both arranged as a frustum-shaped structure with upper and lower openings. The bottom end of the slag discharge of the second filter segment is connected to a slag discharge pipe that passes through the liquid receiving trough and the shell, and the slag discharge pipe is provided with an electric ball valve near the bottom of the second filter segment. The inner surface inclination angle of the first filter segment is smaller than the inner surface inclination angle of the second filter segment. Several liquid outlet pipes are arranged in a circle and located directly above the first filter segment.

[0020] Preferably, a magnetic tube is installed at the lower end of the slag discharge pipe, and the interior of the magnetic tube is hollow and communicates with the inner cavity of the slag discharge pipe.

[0021] Preferably, an electromagnetic coil is sleeved on the surface of the slag discharge pipe, and the electromagnetic coil is electrically connected to the voltage regulator.

[0022] In summary, the technical effects and advantages of the present invention are:

[0023] 1. The present invention has a reasonable structure. The process adopts cyclone electrowinning + two-step hydrogen sulfide sulfidation decoppering + electrowinning dezincification to remove copper and zinc from the washed copper strip liquid. The decoppering and dezincification effect is good and the safety is high. The decoppering and dezincification liquid can be returned to the pickling process for reuse.

[0024] 2. In the present invention, the deep copper removal device adopts a filtering and reacting method, which can prevent the generated precipitation from covering the aeration pipe at the bottom of the tank body, making the aeration rate unstable. At the same time, it can reduce the copper sulfide particles in the post-electrolysis liquid, increase the contact area between the hydrogen sulfide gas and the post-electrolysis liquid, and thus accelerate the reaction;

[0025] 3. In the present invention, the purpose of setting up two reaction tanks is that after the first step of copper removal is completed, the solution is sent to the second reaction tank for secondary copper removal, and the post-electrolysis solution produced in the previous process can be immediately passed into the first reaction tank for a primary copper removal operation, thereby avoiding the waste of a lot of time and low work efficiency caused by both steps of copper removal being carried out in one reaction tank;

[0026] 4. In the present invention, a first filter section and a second filter section are provided, and the water flow falling from the liquid spraying pipe can flush the particles trapped thereon along the inclined surface into the accommodating cavity surrounded by the second filter section, thereby ensuring the cleanliness of the filter part on the first filter section, being beneficial to good filtration of the solution, and avoiding blockage of the first filter section; an electric ball valve and a slag discharge pipe are provided to facilitate slag discharge operations.

[0027] 5. In the present invention, the power generated by the liquid pump when transporting the solution is used to pressurize the filtered filtrate through the spray power unit so that it is sprayed out from the atomizing nozzle, thereby increasing the contact area with the hydrogen sulfide overflowing from the liquid after electrodeposition, which can accelerate the reaction between the copper ions in the water droplets and the hydrogen sulfide gas, and at the same time consume the overflowed gas without adding an additional power source. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a production process flow chart of the present invention;

[0030] Figure 2 This is a structural diagram of the deep decoppering device of the present invention;

[0031] Figure 3 For the present invention Figure 2 Schematic diagram of the cross-sectional structure of the middle filtration unit;

[0032] Figure 4 For the present invention Figure 2 Schematic diagram of the partial cross-section structure of the spray power unit;

[0033] Figure 5 For the present invention Figure 2 Schematic diagram of the cross-sectional structure of the middle reaction tank.

[0034] In the figure: 1. First reaction tank; 101. Air inlet pipe; 102. Liquid inlet pipe; 103. Aeration pipe; 2. Second reaction tank; 3. Filter unit; 31. Shell; 32. Second water distribution tray; 33. Liquid outlet pipe; 34. First filter section; 35. Second filter section; 36. Liquid receiving tank; 4. Connecting pipe; 5. First electric valve; 6. Spray power unit; 61. Mounting pipe; 62. Impeller; 63. Cross; 64. Drive rod; 65. Gear; 66. Protective cover; 7. Liquid suction pump; 8. Two-way pipe; 9. First water distribution tray; 10. Atomizing nozzle; 11. Magnetic tube; 12. Slag discharge pipe; 13. Electric ball valve; 14. Electromagnetic coil. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Example 1

[0037] Take 1m of filtered copper plate washing liquid 3 , the composition analysis is shown in Table 1, the copper is removed by cyclone electrowinning, the current density is 100A / m 2 , electrowinning to the copper ion concentration of 0.55g / L, end the electrowinning, and carry out hydrogen sulfide deep sulfidation to remove copper. The amount of hydrogen sulfide in the first stage is 2 times the theoretical value, and the reaction is 60min. The amount of hydrogen sulfide in the first stage is 3 times the theoretical value, and the reaction is 90min. Then, dezincification is carried out by conventional electrowinning. When the zinc ion concentration is lower than 17g / L, stop the electrowinning. After decoppering and zincing, the liquid is returned to the pickling process for reuse. Practice has shown that it has no effect on the copper plate and strip.

[0038] Example 2

[0039] Take 1m of filtered copper plate washing liquid 3 The composition analysis is shown in Table 1. The copper stripping was carried out by cyclone electrowinning with a current density of 180A / m 2, electrowinning to the copper ion concentration of 0.48g / L, end the electrowinning, and carry out hydrogen sulfide deep sulfidation to remove copper. The amount of hydrogen sulfide in the first stage is 1.5 times the theoretical value, and the reaction is 40min. The amount of hydrogen sulfide in the first stage is 3.5 times the theoretical value, and the reaction is 80min. Then, dezincification is carried out by conventional electrowinning. When the zinc ion concentration is lower than 18g / L, stop the electrowinning. After decoppering and zincing, the liquid is returned to the pickling process for reuse. Practice has shown that it has no effect on the copper plate and strip.

[0040] Example 3

[0041] Take 1m of filtered copper plate washing liquid 3 The composition analysis is shown in Table 1. The copper is removed by cyclone electrowinning with a current density of 150A / m 2 , electrowinning to the copper ion concentration of 0.59g / L, end the electrowinning, and carry out hydrogen sulfide deep sulfidation to remove copper. The amount of hydrogen sulfide in the first stage is 3 times the theoretical value, and the reaction is 75min. The amount of hydrogen sulfide in the first stage is 5 times the theoretical value, and the reaction is 120min. Then, dezincification is carried out by conventional electrowinning. When the zinc ion concentration is lower than 16g / L, stop the electrowinning. After decoppering and zincing, the liquid is returned to the pickling process for reuse. Practice has shown that it has no effect on the copper plate and strip.

[0042] Table 1 Analysis of components of copper strip washing filtrate / mg·L -1

[0043]

[0044] refer to Figure 2-5A deep copper removal device comprises a first reaction tank 1 and a second reaction tank 2, two filter units 3 arranged at intervals, and a spray power unit 6. The two liquid inlet ends of the two filter units 3 are connected to the liquid outlet ends of the first reaction tank 1 and the second reaction tank 2 respectively through two connecting pipes 4. The two connecting pipes 4 are both equipped with a liquid pump 7. The liquid outlet end of the filter unit 3 is connected to a two-way pipe 8. The two branches of the two-way pipe 8 are both arranged obliquely downward and are each equipped with a first electric valve 5. The two branches of the left two-way pipe 8 are respectively connected to the first reaction tank 1 and the second reaction tank The first reaction tank 1 and the second reaction tank 2 are connected, and the two branches of the two-way pipe 8 on the right are respectively connected to the second reaction tank 2 and the liquid inlet end of the electrolytic dezincification equipment; the inner cavities of the first reaction tank 1 and the second reaction tank 2 are both provided with spiral aeration pipes 103 and stirring systems, and the air inlet pipes 101 of the two aeration pipes 103 are respectively located outside the first reaction tank 1 and the second reaction tank 2. The inner cavities of the first reaction tank 1 and the second reaction tank 2 are both installed with first water distribution trays 9, and the bottom of the first water distribution trays 9 are densely covered with atomizing nozzles 10. The outer surface of the first water distribution tray 9 forms a seal with the inner wall of the tank. The liquid inlet end of the first water distribution pan 9 is connected to a branch pipe extending to the inner cavity of the tank body. The first reaction tank 1 is provided with a liquid inlet pipe 102 of an automatic second electric valve, and the lower end of the liquid inlet pipe 102 is sealed and passes through the first water distribution pan 9. A branch pipe of the left two-way pipe 8 is sealed and passes through the second reaction tank 2 and the first water distribution pan 9 located in its inner cavity; the spray power unit 6 includes two mounting pipes 61 respectively mounted on a branch pipe of the two-way pipe 8 and the connecting pipe 4, and a driving rod 64 rotatably arranged on the mounting pipe 61. The inner cavities of the two mounting pipes 61 are both passed through ten The frame 63 is rotatably provided with an impeller 62, and gears 65 are provided on the rotating shafts of the two impellers 62 and both ends of the driving rod 64. The adjacent gears 65 are meshed and connected, and the adjacent gears 65 are arranged in a protective cover 66; the filter unit 3 includes a shell 31 with a filter layer and a second water distribution tray 32 inside. A liquid receiving tank 36 is installed inside the shell 31, the upper end of the two-way pipe 8 is connected to the liquid receiving tank 36, the upper end of the connecting pipe 4 is connected to the liquid inlet end of the second water distribution tray 32, and the lower end of the second water distribution tray 32 is provided with several liquid outlet pipes 33.

[0045] During use, the post-electrolysis liquid can be injected into the first reaction tank 1 through the liquid inlet pipe 102. After completion, the second electric valve is controlled to close (hydrogen sulfide is toxic, so it is necessary to avoid the overflow of hydrogen sulfide in the subsequent reaction tank). At this time, hydrogen sulfide gas can be continuously delivered to the aeration pipe 103 through the air supply equipment, and the stirring shaft of the stirring system is used for stirring. At the same time, the liquid pump 7 is controlled to work, and the copper sulfide particles produced by the reaction in the reaction tank and the post-electrolysis liquid are pumped into the shell 31. They are evenly distributed through the second water distribution tray 32, and the solution is filtered by the filter layer to intercept the copper sulfide particles. The filtered liquid falls into the liquid receiving tank 36 and enters the inclined device. In the branch pipe, the impeller 62 provided in the inner cavity of the mounting pipe 61 installed on the branch pipe (the rotational power of the impeller 62 comes from the impeller 62 in the other mounting pipe 61, the impeller 62 on the connecting pipe 4 rotates under the impact of the water flow, and the impeller 62 on the branch pipe is driven to rotate by the cooperation of the gear 65 and the drive) pressurizes the filtered liquid in the branch pipe so that it is sprayed out from the atomizing nozzle 10, increasing the contact area with the hydrogen sulfide overflowing from the liquid after electrodeposition, which can accelerate the reaction between the copper ions in the water droplets and the hydrogen sulfide gas, and at the same time consume the overflowing gas without adding an additional power source. After the copper removal is completed once, the left side can be opened. The first electric valve 5 on the left side of the double-way pipe is closed, and the first electric valve 5 on the right side is opened. The solution in the first reaction tank 1 is pumped to the second reaction tank 2 through the branch pipe by the liquid pump 7, and the first electric valve 5 opened on the right side is closed. The operation steps of the secondary decoppering are the same as those of the primary decoppering except for the amount of hydrogen sulfide introduced and the reaction time. The device adopts a filtering and reacting method to avoid the precipitation from covering the aeration pipe at the bottom of the tank body, which affects the aeration rate and makes it unstable (a stable aeration rate is conducive to accelerating the reaction). At the same time, it can reduce the copper sulfide particles in the liquid after electrolysis (fine particles will be suspended under the stirring of the stirring system). The copper sulfide particles will float, and the large particles will sink. The presence of copper sulfide particles will reduce the contact area between hydrogen sulfide gas and the post-electrolysis liquid. The contact area between hydrogen sulfide gas and the post-electrolysis liquid can be increased, thereby accelerating the reaction. A two-step deep decoppering method is adopted. The first step is carried out in the first reaction tank 1, and the second step is carried out in the second reaction tank 2. The purpose of setting up two reaction tanks is that after the first step of decoppering is completed, its solution is sent to the second reaction tank 2 for secondary decoppering, and the post-electrolysis liquid produced in the previous process can be immediately passed into the first reaction tank 1 for a decoppering operation, thereby avoiding the two steps of decoppering being carried out in one reaction tank, which causes a lot of time waste and low work efficiency.

[0046] It should be noted that: 1. Since hydrogen sulfide is a toxic gas, in order to prevent the migration of hydrogen sulfide gas, the first reaction tank 1, the second reaction tank 2, the shell 31 and the connecting parts should be sealed during the entire reaction process; this device can also use only one reaction tank, which can reduce costs, but its efficiency is low and it is not suitable for continuous copper strip washing and liquid decoupling operations.

[0047] As a preferred implementation in this embodiment, Figure 3 As shown, the filter layer includes a first filter section 34 and a second filter section 35 arranged in an annular shape and connected to each other. The first filter section 34 and the second filter section 35 are both arranged in a frustum-shaped structure with upper and lower openings. The bottom end of the slag discharge of the second filter section 35 is connected to the slag discharge pipe 12 that runs through the liquid receiving tank 36 and the shell 31, and the slag discharge pipe 12 is provided with an electric ball valve 13 near the bottom of the second filter section 35. The inner surface inclination angle of the first filter section 34 is smaller than the inner surface inclination angle of the second filter section 35. Several liquid outlet pipes 33 are arranged in a circle and are located directly above the first filter section 34. The solution containing copper sulfide particles is pumped to the second water distribution pipe 7 by the liquid pump 7. The copper sulfide particles are retained on the first filter section 34. Since the inner surface of the first filter section 34 is inclined, the water flowing from the liquid outlet pipe 33 can flush the retained particles along the inclined surface into the accommodating cavity surrounded by the second filter section 35, thereby ensuring the cleanliness of the filtration part on the first filter section 34, facilitating good filtration of the solution, and avoiding clogging of the first filter section 34. When a certain amount of copper sulfide particles are accumulated in the accommodating cavity, the electric ball valve 13 can be opened to discharge them, thereby facilitating the slag discharge operation.

[0048] It should be noted that the inclination angle between the inner surface of the first filter section 34 and the horizontal plane is set to 20 to 30 degrees.

[0049] As a preferred implementation in this embodiment, Figure 1 As shown, a magnetic tube 11 is installed at the lower end of the slag discharge pipe 12. The interior of the magnetic tube 11 is hollow and communicates with the inner cavity of the slag discharge pipe 12. It can be seen that the electric ball valve 13 is opened to allow the copper sulfide located in the second filter section 35 to be discharged downward through the slag discharge 11. A receiving bucket can be placed at the slag discharge port in advance. Since the filter unit 3 has a certain height, the copper sulfide moves by free fall during slag discharge and eventually has a very high speed. This and the impact on the bottom of the bucket will cause the copper sulfide particles to splash, causing waste and inconvenience in cleaning. Therefore, a magnetic tube 11 is provided. According to Lenz's law (the magnetic field of the induced current always hinders the change of the magnetic flux causing the induced current), it can be seen that the magnetic tube 11 can hinder the falling of the copper sulfide particles, reduce their movement speed, and thus avoid a large impact with the placement bucket causing the copper sulfide particles to splash.

[0050] It should be noted that: first, a magnetic isolation coating can be provided on the surface of the magnetic tube 11 to prevent it from absorbing other debris; second, when the accumulated sulfide particles fall from the slag discharge pipe 12, the copper sulfide particles in contact with each other can be regarded as a whole to generate an induced magnetic field; third, when the slag discharge pipe 12 is blocked and unable to discharge materials, the outer wall of the slag discharge pipe can be knocked to make it vibrate, thereby promoting discharge.

[0051] As a preferred implementation in this embodiment, Figure 1 As shown, the outer surface of the slag discharge pipe 12 is provided with an electromagnetic coil 14, and the electromagnetic coil 14 is electrically connected to the voltage regulator. The electromagnetic coil 14 can be energized to generate an induced magnetic field in the slag discharge pipe 12, that is, the slag discharge pipe 12 is magnetic. The copper sulfide particles are then induced magnetically through the slag discharge pipe 12 and hindered from moving downward, thereby avoiding a large impact with the placement bucket and causing the copper sulfide particles to splash. At the same time, the magnetic size of the slag discharge pipe 12 is changed by controlling the voltage regulator to adjust the current in the electromagnetic coil 14, thereby changing the size of the inductive magnetic field of the copper sulfide, and finally changing the movement speed of the copper sulfide particles, thereby adjusting the mitigation effect on the copper sulfide particles.

[0052] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A production process for removing copper and zinc from washed copper strips, comprising the following steps: S1: The washed liquid is filtered once to remove insoluble impurities, and the filter residue is returned to the brass furnace; S2: The filtrate is passed into a cyclone electrowinning device for preliminary copper removal to obtain electrowinning liquid and copper flakes. Copper removal is stopped when the copper content reaches 0.4-0.6 g / L. S3: The filtered post-electrolytic solution is passed into the hydrogen sulfide sulfidation copper removal equipment for deep copper removal, using a two-step sulfidation copper removal method; S31: decoppering once, introducing hydrogen sulfide in an amount of 1.5 to 3 times the theoretical value, at room temperature, while stirring, and the reaction time is 45 to 75 minutes; S32: Secondary decoppering, introducing hydrogen sulfide in an amount of 3 to 5 times the theoretical value, at room temperature, while stirring, the reaction time is 80 min to 120 min; S4: The solution after deep copper removal is filtered, and the filter residue is returned to the brass furnace. The filtrate enters the electrolytic dezincification equipment for dezincification treatment to obtain zinc flakes and dezincified liquid. Dezincification is stopped when the zinc is removed to 12-18 g / L, and the dezincified liquid is returned to the copper plate and strip cleaning process; The decoppering equipment comprises a first reaction tank (1) and a second reaction tank (2), two filter units (3) arranged at intervals, and a spray power unit (6); the two liquid inlet ends of the two filter units (3) are respectively connected to the liquid outlet ends of the first reaction tank (1) and the second reaction tank (2) through two connecting pipes (4); a liquid pump (7) is installed on each of the two connecting pipes (4); the liquid outlet end of the filter unit (3) is connected to a double-way pipe (8); the two branches of the double-way pipe (8) are both arranged obliquely downward and are each equipped with a first electric valve (5); the two branches of the left double-way pipe (8) are respectively connected to the first reaction tank (1) and the second reaction tank (2); and the two branches of the right double-way pipe (8) are respectively connected to the second reaction tank (2) and the liquid inlet end of the electrolytic dezincification equipment; The inner cavities of the first reaction tank (1) and the second reaction tank (2) are both provided with spiral aeration pipes (103) and a stirring system. The air inlet pipes (101) of the two aeration pipes (103) are respectively located outside the first reaction tank (1) and the second reaction tank (2). The inner cavities of the first reaction tank (1) and the second reaction tank (2) are both provided with first water distribution trays (9), and the bottoms of the first water distribution trays (9) are densely covered with atomizing nozzles (10). The outer surface of the first water distribution tray (9) forms a seal with the inner wall of the tank body. The liquid inlet end of the first water distribution tray (9) is connected to one of the branch pipes extending to the inner cavity of the tank body. The first reaction tank (1) is provided with a liquid inlet pipe (102) of an automatic second electric valve, and the lower end of the liquid inlet pipe (102) is sealed and passes through the first water distribution tray (9). One of the branch pipes of the left-side double-way pipe (8) is sealed and passes through the second reaction tank (2) and the first water distribution tray (9) located in its inner cavity. The spray power unit (6) includes two mounting tubes (61) respectively mounted on the branch tube of the two-way tube (8) and the connecting tube (4), and a driving rod (64) rotatably arranged on the mounting tubes (61), the inner cavities of the two mounting tubes (61) are both rotatably provided with impellers (62) through a cross (63), the rotating shafts of the two impellers (62) and the two ends of the driving rod (64) are both provided with gears (65), the adjacent two gears (65) are meshed and connected, and the adjacent two gears (65) are provided in a protective cover (66); The filter unit (3) comprises a housing (31) having a filter layer and a second water distribution tray (32) therein; a liquid receiving trough (36) is installed inside the housing (31); the upper end of the two-way pipe (8) is connected to the liquid receiving trough (36); the upper end of the connecting pipe (4) is connected to the liquid inlet end of the second water distribution tray (32); and the lower end of the second water distribution tray (32) is provided with a plurality of liquid outlet pipes (33).

2. The process for removing copper and zinc from washed copper strip according to claim 1, characterized in that: In S2, the anode of the cyclone electrowinning equipment is an iridium-plated titanium rod, the cathode is a titanium sheet, the electrolyte flow rate is 50~300L / min, and the current density is 100~200 A / m 2 .

3. The process for removing copper and zinc from washed copper strip according to claim 1, characterized in that: In S3, the hydrogen sulfide is purchased from outside or prepared on site using a sulfiding agent, and the sulfiding agent is one or more of sodium sulfide, sodium hydrosulfide, zinc sulfide or barium sulfide.

4. The process for removing copper and zinc from washed copper strip according to claim 1, characterized in that: In S4, the electrolytic dezincification current density is 400~600 A / m 2 .

5. The process for removing copper and zinc from washed copper strip according to claim 1, characterized in that: The filter layer comprises a first filter section (34) and a second filter section (35) which are arranged in an annular shape and connected to each other. The first filter section (34) and the second filter section (35) are both arranged in a frustum-shaped structure with upper and lower openings. The bottom end of the second filter section (35) is connected to a slag discharge pipe (12) which passes through the liquid receiving tank (36) and the shell (31). The slag discharge pipe (12) is provided with an electric ball valve (13) near the bottom of the second filter section (35). The inner surface inclination angle of the first filter section (34) is smaller than the inner surface inclination angle of the second filter section (35). A plurality of the liquid discharge pipes (33) are arranged in a circle and are located directly above the first filter section (34).

6. The process for removing copper and zinc from washed copper strip according to claim 5, characterized in that: A magnetic tube (11) is installed at the lower end of the slag discharge pipe (12); the interior of the magnetic tube (11) is hollow and communicates with the inner cavity of the slag discharge pipe (12).

7. The process for removing copper and zinc from washed copper strip according to claim 5, characterized in that: An electromagnetic coil (14) is sleeved on the outer surface of the slag discharge pipe (12), and the electromagnetic coil (14) is electrically connected to a voltage regulator.

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