Copper foil wastewater treatment device and electrolytic copper foil production system

Abstract

The application discloses a copper foil wastewater treatment device and an electrolytic copper foil production system, each reaction system comprising a reaction tank, an extraction tank and a recovery tank, the extraction tank being provided with an extractant and a back extractant, the types of the extractants in adjacent two reaction systems being different; when the copper foil wastewater enters the reaction tank, a negative pressure device controls the air pressure in the reaction tank to reach a first preset air pressure, the extractant enters the reaction tank and is mixed with the copper foil wastewater; when the copper foil wastewater is mixed with the extractant, the negative pressure device controls the air pressure in the reaction tank to reach a second preset air pressure, the mixed copper foil wastewater enters the extraction tank, the back extractant is mixed with the mixed copper foil wastewater to obtain metal ions to be extracted, and the recovery tank recovers the metal ions to be extracted; the reaction tank passes the un-mixed copper foil wastewater into the reaction tank of the next reaction system for reaction. The copper foil wastewater is cyclically treated, and different types of metal ions in the copper foil wastewater are extracted.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of copper foil, in particular to a copper foil wastewater treatment device and an electrolytic copper foil production system. BACKGROUND

[0002] The copper foil wastewater contains a large amount of heavy metals, and heavy metals are the main cause of water and soil pollution, which is harmful to the health of organic matter in the environment. With the increasing awareness of environmental protection, the removal and recovery of heavy metals in copper foil wastewater have been a concern in recent years.

[0003] The conventional technology for treating copper foil wastewater containing heavy metal ions at present is chemical precipitation method and ion exchange method. However, the chemical precipitation method needs to add chemicals and treat sludge containing a large amount of heavy metals; the ion exchange resin must be regenerated with concentrated electrolyte, which will produce concentrated waste liquid flow, causing secondary pollution, and the copper foil wastewater treatment is one-time, and if the treatment is not complete, part of the heavy metal ions will still exist and enter the external environment, causing environmental pollution.

[0004] Therefore, how to realize the cyclic treatment of copper foil wastewater and extract different kinds of metal ions in copper foil wastewater has become a problem to be solved in the field. SUMMARY

[0005] The present application discloses a copper foil wastewater treatment device and an electrolytic copper foil production system, which aims to realize the cyclic treatment of copper foil wastewater and extract different kinds of metal ions in copper foil wastewater.

[0006] The application discloses a copper foil wastewater treatment device, which comprises a wastewater pool for containing copper foil wastewater; the copper foil wastewater treatment device further comprises a plurality of reaction systems connected in sequence; each reaction system comprises a reaction tank, an extraction tank and a recovery tank, the reaction tank is connected with the extraction tank, the extraction tank is connected with the recovery tank, and the reaction tanks in adjacent two reaction systems are connected with each other; the extraction tank is provided with an extractant and a back extractant, and the types of the extractants in adjacent two reaction systems are different; a negative pressure device is connected between the reaction tank and the extraction tank, and the negative pressure device is used for controlling the air pressure between the reaction tank and the extraction tank; the wastewater pool is connected with the reaction tank in the reaction system near one side of the wastewater pool; when the copper foil wastewater enters the reaction tank, the negative pressure device controls the air pressure in the reaction tank to reach a first preset air pressure, the extractant enters the reaction tank and is mixed with the copper foil wastewater; after the copper foil wastewater is mixed with the extractant, the negative pressure device controls the air pressure in the reaction tank to reach a second preset air pressure, the mixed copper foil wastewater enters the extraction tank, the back extractant is mixed with the mixed copper foil wastewater to obtain metal ions to be extracted, and the recovery tank recovers the metal ions to be extracted; the reaction tank passes the un-mixed copper foil wastewater into the reaction tank of the next reaction system for reaction.

[0007] Optionally, the extraction tank comprises a tank body, an adding opening is formed in the top of the tank body, and the extractant and the back extractant are added through the adding opening; a first filter membrane layer and a second filter membrane layer are arranged in the tank body, the filtering precision of the first filter membrane layer ranges from 5 μm to 10 μm, the second filter membrane layer comprises an oil-water separation ceramic ultrafiltration membrane, and the filtering precision of the second filter membrane layer ranges from 0.01 μm to 0.1 μm; a stirring device is further arranged between the first filter membrane layer and the second filter membrane layer, and the stirring device is used for mixing the extractant and the back extractant.

[0008] Optionally, the reaction tank comprises a reaction tank body, a stirring paddle and a third filter membrane, the stirring paddle is arranged in the middle of the reaction tank body and is used for stirring the copper foil wastewater and the extractant, the third filter membrane is arranged in the reaction tank body and is used for separating the copper foil wastewater mixed with the extractant, and an acidic solution is further added into the reaction tank body, and the acidic solution is used for adjusting the PH value in the reaction tank body.

[0009] Optionally, the acid solution comprises sulfuric acid; the reaction system comprises a first reaction system, a second reaction system, a third reaction system and a fourth reaction system, the first reaction system is used for extracting zinc ions, the second reaction system is used for extracting copper ions, the third reaction system is used for extracting nickel ions, and the fourth reaction system is used for extracting chromium ions; the concentration of the sulfuric acid added in the reaction tank of the first reaction system and the second reaction system ranges from 1% to 2%, the pH value in the reaction tank of the first reaction system ranges from 1.25 to 1.6, the pH value in the reaction tank of the second reaction system ranges from 0.8 to 1.3, sodium carbonate or sodium bicarbonate is added in the reaction tank of the third reaction system and the fourth reaction system, the pH value in the reaction tank of the third reaction system ranges from 5 to 5.6, and the pH value in the reaction tank of the fourth reaction system ranges from 5.7 to 6.2.

[0010] Optionally, in the first reaction system and the fourth reaction system, the extractant in the extraction tank comprises a mixture of methyltrioctylammonium chloride and methyltrioctylammonium chloride, the stripping agent in the extraction tank of the first reaction system is sodium hydroxide aqueous solution, and the stripping agent in the extraction tank of the fourth reaction system is sulfuric acid aqueous solution; in the second reaction system and the third reaction system, the extractant in the extraction tank comprises a mixture of 2-hydroxy-5-dodecyl salicylaldoxime and 2-hydroxy-5-nonyl phenylacetyl oxime, and the stripping agent is sulfuric acid aqueous solution.

[0011] Optionally, in the first reaction system, the concentration of the extractant in the extraction tank ranges from 5% to 13%; in the second reaction system, the concentration of the extractant in the extraction tank ranges from 2% to 7%; in the fourth reaction system and the third reaction system, the concentration of the extractant in the extraction tank is 10%; and in the first reaction system, the second reaction system, the third reaction system and the fourth reaction system, the mixing ratio of the extractant to kerosene ranges from 1:1 to 1:1.2.

[0012] Optionally, in the first reaction system and the fourth reaction system, the concentration of methyltrioctylammonium chloride in the extractant ranges from 75% to 90%, and the concentration of methyltrioctylammonium chloride in the extractant ranges from 10% to 25%; the concentration of the stripping agent in the first reaction system ranges from 5% to 10%; the concentration of the stripping agent in the second reaction system ranges from 35% to 55%; the concentration of the stripping agent in the third reaction system ranges from 10% to 23%; and the concentration of the stripping agent in the fourth reaction system ranges from 8% to 11.3%.

[0013] Optionally, the pressure in each of the reaction tanks in the first to fourth reaction systems is sequentially different by a preset pressure value, the preset pressure value ranges from 0.01 MPa to 0.3 MPa; and a one-way valve is installed on each of the fourth pipelines.

[0014] Optionally, the fourth reaction system is provided with a backflow port at the bottom of the reaction tank, and a backflow pipeline is connected between the backflow port and the wastewater pool; after the chromium metal recovery of the fourth reaction system is completed, the copper foil wastewater in the reaction tank flows into the wastewater pool through the backflow pipeline and reenters the reaction tank of the first reaction system.

[0015] The application further discloses an electrolytic copper foil production system, which comprises a copper foil surface treatment device and the copper foil wastewater treatment device.

[0016] The application sequentially connects multiple reaction systems, so that the copper foil wastewater in the wastewater pool can sequentially enter each reaction system for reaction. Each reaction system is provided with a reaction tank, an extraction tank and a recovery tank. The extraction tank is provided with an extractant and a back-extractant corresponding to the metal ions to be extracted. When the copper foil wastewater enters the reaction tank, the negative pressure device controls the air pressure in the reaction tank and the extraction tank to reach a first preset air pressure. At this time, the extractant in the extraction tank enters the reaction tank under the action of the air pressure and mixes with the copper foil wastewater, so that the corresponding metal ions in the copper foil wastewater are dissolved in the extractant. At this time, the negative pressure device controls the air pressure in the reaction tank and the extraction tank to reach a second preset air pressure, so that the copper foil wastewater mixed with the extractant enters the extraction tank under the action of the air pressure and mixes with the back-extractant in the extraction tank. The corresponding metal ions are extracted by reacting with the corresponding back-extractant, and then recovered by the recovery tank. Meanwhile, the un-mixed copper foil wastewater enters the next reaction system under the action of the air pressure for reaction to extract the corresponding metal ions. In this way, the copper foil wastewater sequentially passes through multiple reaction systems for reaction, so that the copper foil wastewater is cyclically treated to extract different types of metal ions from the copper foil wastewater, reduce the heavy metal pollution of the copper foil wastewater and realize the recycling of the heavy metal ions. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the embodiments of the application, form a part of the specification and illustrate the principles of the application. It will be apparent to those of ordinary skill in the art that other embodiments can be practiced with the drawings without adding creative steps or departing from the principles of the application. In the drawings:

[0018] Figure 1 a schematic diagram of an embodiment of the copper foil wastewater treatment device of the present application;

[0019] Figure 2 a block diagram of an embodiment of the electrolytic copper foil production system of the present application.

[0020] wherein, 10, electrolytic copper foil production system; 100, copper foil wastewater treatment device; 200, copper foil surface treatment device; 110, wastewater tank; 120, reaction system; 121, reaction tank; 122, reaction tank body; 123, stirring paddle; 124, third filter membrane; 130, extraction tank; 131, tank body; 132, addition port; 133, first filter membrane layer; 134, second filter membrane layer; 135, stirring device; 140, recovery tank; 141, negative pressure device; 150, first reaction system; 160, second reaction system; 170, third reaction system; 180, fourth reaction system; 181, backflow port; 182, backflow pipeline; 300, extractant; 400, stripping agent; 500, copper foil wastewater; 600, one-way valve. DETAILED DESCRIPTION

[0021] The present application will be described in detail below with reference to the accompanying drawings and optional embodiments. It should be noted that, under the premise of no conflict, each embodiment described below or each technical feature can be combined with any other embodiment or technical feature to form a new embodiment.

[0022] Figure 1 a schematic diagram of an embodiment of the copper foil wastewater treatment device of the present application, as Figure 1As shown, the application discloses a copper foil wastewater treatment device 100, which comprises a wastewater pool 110 for containing copper foil wastewater 500; the copper foil wastewater treatment device 100 further comprises a plurality of reaction systems 120 connected in sequence; each reaction system 120 comprises a reaction tank 121, an extraction tank 130 and a recovery tank 140, the reaction tank 121 is connected with the extraction tank 130, the extraction tank 130 is connected with the recovery tank 140, and the reaction tanks 121 in two adjacent reaction systems 120 are connected with each other; the extraction tank 130 is provided with an extractant 300 and a reverse extractant 400, and the extractants 300 in two adjacent reaction systems 120 are different in kind; a negative pressure device 141 is connected between the reaction tank 121 and the extraction tank 130, and the negative pressure device 141 is used for controlling the air pressure between the reaction tank 121 and the extraction tank 130; the wastewater pool 110 is connected with the reaction tank 121 in the reaction system 120 close to the wastewater pool 110; when the copper foil wastewater 500 enters the reaction tank 121, the negative pressure device 141 controls the air pressure in the reaction tank 121 to reach a first preset air pressure, and the extractant 300 enters the reaction tank 121 and is mixed with the copper foil wastewater 500; when the copper foil wastewater 500 is mixed with the extractant 300, the negative pressure device 141 controls the air pressure in the reaction tank 121 to reach a second preset air pressure, the mixed copper foil wastewater 500 enters the extraction tank 130, the reverse extractant 400 is mixed with the mixed copper foil wastewater 500 to obtain metal ions to be extracted, and the recovery tank 140 recovers the metal ions to be extracted; the reaction tank 121 passes the un-mixed copper foil wastewater 500 into the reaction tank 121 of the next reaction system 120 for reaction.

[0023] The application sets multiple reaction systems 120, and sequentially connects each reaction system 120, so that the copper foil wastewater 500 in the wastewater pool 110 can sequentially enter each reaction system 120 for reaction. Each reaction system 120 is provided with a reaction tank 121, an extraction tank 130 and a recovery tank 140. The extraction agent 300 corresponding to the metal ion to be extracted and the stripping agent 400 are added in the extraction tank 130. When the copper foil wastewater 500 enters the reaction tank 121, the negative pressure device 141 controls the air pressure in the reaction tank 121 and the extraction tank 130 to reach a first preset air pressure. At this time, the extraction agent 300 in the extraction tank 130 enters the reaction tank 121 under the action of air pressure and mixes with the copper foil wastewater 500, so that the corresponding metal ion in the copper foil wastewater 500 is dissolved in the extraction agent 300. At this time, the negative pressure device 141 controls the air pressure in the reaction tank 121 and the extraction tank 130 to reach a second preset air pressure, so that the copper foil wastewater 500 mixed with the extraction agent 300 enters the extraction tank 130 under the action of air pressure and mixes with the stripping agent 400 in the extraction tank 130. The corresponding metal ion is extracted by reacting with the corresponding stripping agent 400, and then recovered through the recovery tank 140. At the same time, the un-mixed copper foil wastewater 500 enters the next reaction system 120 for reaction and extraction of the corresponding metal ion under the action of air pressure. In this way, the copper foil wastewater 500 sequentially passes through multiple reaction systems 120 for reaction, realizes the cyclic treatment of the copper foil wastewater 500, extracts different kinds of metal ions in the copper foil wastewater 500, reduces the heavy metal pollution of the copper foil wastewater 500, and also realizes the recycling and reuse of the heavy metal ions.

[0024] It should be noted that the first preset air pressure in the application refers to that the negative pressure device 141 controls the air pressure in the reaction tank 121 to be less than the air pressure in the extraction tank 130, so that there is a pressure difference between the reaction tank 121 and the extraction tank 130. Under the action of the pressure difference, the extraction agent 300 in the extraction tank 130 enters the reaction tank 121 and mixes with the copper foil wastewater 500. The second preset air pressure refers to that the negative pressure device 141 controls the air pressure in the reaction tank 121 to be greater than the air pressure in the extraction tank 130, so that there is a pressure difference between the reaction tank 121 and the extraction tank 130. Under the action of the pressure difference, the copper foil wastewater 500 mixed with the extraction agent 300 in the reaction tank 121 enters the extraction tank 130 and mixes with the stripping agent 400.

[0025] In addition, in this application, the waste water tank 110 and the reaction tank 121, the reaction tank 121 of the adjacent two reaction systems 120, the reaction tank 121 and the extraction tank 130, the extraction tank 130 and the recovery tank 140 are connected by pipelines, so that the copper foil waste water 500 in the waste water tank 110 can enter the reaction tank 121 through the pipeline, the extractant 300 in the extraction tank 130 can enter the reaction tank 121 through the pipeline and react with the copper foil waste water 500, the metal ions extracted by the extraction tank 130 can enter the recovery tank 140 through the pipeline for recovery, and the copper foil waste water 500 not mixed with the extractant 300 can flow through the reaction tank 121 between the adjacent two reaction systems 120 through the pipeline.

[0026] Specifically, the extraction tank 130 includes a tank body 131, an adding port 132 is opened at the top of the tank body 131 for adding extractant 300 and stripping agent 400; a first filter membrane layer 133 and a second filter membrane layer 134 are arranged in the tank body 131, the filtering precision of the first filter membrane layer 133 ranges between 5μm and 10μm; the second filter membrane layer 134 includes an oil-water separation ceramic ultrafiltration membrane, and the filtering precision of the second filter membrane layer 134 ranges between 0.01μm and 0.1μm; a stirring device 135 is further arranged between the first filter membrane layer 133 and the second filter membrane layer 134, and the stirring device 135 is used for mixing the extractant 300 and the stripping agent 400.

[0027] When the reaction system 120 is continuously involved in the treatment process of the copper foil waste water 500, the extractant 300 and the stripping agent 400 in the extraction tank 130 will be consumed, and when the extractant 300 and the stripping agent 400 are insufficient, the extractant 300 and the stripping agent 400 can be added to the extraction tank 130 through the adding port 132 at the top of the tank body 131, so as to ensure that the reaction system 120 can continuously react with the copper foil waste water 500 and extract the corresponding metal ions.

[0028] And the extraction tank 130 has two layers of filter membranes, namely the first filter membrane layer 133 and the second filter membrane layer 134, the first filter membrane layer 133 can include a common folded membrane, and the filtering precision of the first filter membrane layer 133 ranges between 5μm and 10μm, such filtering precision can make the first filter membrane layer 133 remove large particle impurities in the extractant 300; and the second filter membrane layer 134 can include an oil-water separation ceramic ultrafiltration membrane, and the filtering precision thereof ranges between 0.01μm and 0.1μm, the second filter membrane layer 134 can prevent the extractant 300 from flowing into the recovery tank 140, thereby affecting the recovery effect of the metal ions, in addition, the second filter membrane layer 134 can also separate the extractant 300 and the stripping agent 400, so that the extractant 300 can be recycled to the reaction tank 121 for reaction.

[0029] In addition, the stirring device 135 is arranged between the first filter membrane layer 133 and the second filter membrane layer 134 in the present application. When the copper foil wastewater 500 mixed with the extractant 300 enters the extraction tank 130, the stirring device 135 is started to mix the copper foil wastewater 500 in the extraction tank 130 with the stripping agent 400, so that the stripping agent 400 can be fully mixed with the copper foil wastewater 500, thereby extracting the corresponding metal ions and entering the recovery tank 140 for recovery, which is beneficial to improve the extraction efficiency of metal ions.

[0030] Further, the reaction tank 121 comprises a reaction tank body 122, a stirring paddle 123 and a third filter membrane 124. The stirring paddle 123 is arranged in the middle of the reaction tank body 122 and is used to stir the copper foil wastewater 500 and the extractant 300. The third filter membrane 124 is arranged in the reaction tank body 122 and is used to separate the copper foil wastewater 500 after extraction with the extractant 300. An acidic solution is added in the reaction tank body 122, which is used to adjust the PH value in the reaction tank body 122.

[0031] Since the metal ions need to be diffused and dissolved from the copper foil wastewater 500 into the extractant 300, a certain reaction environment and reaction condition are required. Therefore, the acidic solution is added in the reaction tank body 122 in the present application to adjust the PH value in the reaction tank body 122. According to the concentration and type of the added acidic solution, the corresponding PH value in the reaction tank body 122 of the different reaction systems 120 is adjusted to meet the reaction environment required by the different extractants 300 when reacting with the copper foil wastewater 500, so as to ensure that the corresponding metal ions in the copper foil wastewater 500 can be dissolved and diffused in the corresponding extractant 300 in the reaction tank 121 of each reaction system 120, thereby ensuring that each reaction system 120 recovers different metal ions. This is beneficial to realize the recovery and reuse of heavy metal ions and reduce environmental pollution.

[0032] And, the reaction tank body 122 in the present application is installed with a stirring paddle 123 and a third filter membrane 124, when the extractant 300 enters into the reaction tank body 122, the extractant 300 and the copper foil wastewater 500 are mechanically stirred by the stirring paddle 123, so as to promote the extractant 300 to fully mix with the copper foil wastewater 500, and facilitate the metal ions to diffuse from the copper foil wastewater 500 and dissolve in the extractant 300, and the third filter membrane 124 can include an oil-water separation ceramic ultrafiltration membrane, when the corresponding metal ions in the copper foil wastewater 500 dissolve into the extractant 300, the third filter membrane 124 can be used to separate the copper foil wastewater 500 mixed with the extractant 300 from the copper foil wastewater 500 not mixed with the extractant 300, so as to facilitate the copper foil wastewater 500 mixed with the extractant 300 and the copper foil wastewater 500 not mixed with the extractant 300 to enter into the extraction tank 130 and the reaction tank 121 of the next reaction system 120 respectively and carry out different reactions when the air pressure of the reaction tank 121 and the extraction tank 130 is adjusted to the second preset air pressure by the negative pressure device 141.

[0033] Among them, the acid solution of the present application includes sulfuric acid; the reaction system 120 includes a first reaction system 150, a second reaction system 160, a third reaction system 170 and a fourth reaction system 180, the first reaction system 150 is used for extracting zinc ions, the second reaction system 160 is used for extracting copper ions, the third reaction system 170 is used for extracting nickel ions, and the fourth reaction system 180 is used for extracting chromium ions; the concentration of sulfuric acid added in the reaction tank 121 of the first reaction system 150 and the second reaction system 160 ranges from 1% to 2%, the PH value in the reaction tank 121 of the first reaction system 150 ranges from 1.25 to 1.6; the PH value in the reaction tank 121 of the second reaction system 160 ranges from 0.8 to 1.3; sodium carbonate or sodium bicarbonate is added in the reaction tank 121 of the third reaction system 170 and the fourth reaction system 180; the PH value in the reaction tank 121 of the third reaction system 170 ranges from 5 to 5.6; the PH value in the reaction tank 121 of the fourth reaction system 180 ranges from 5.7 to 6.2.

[0034] The application sets the first reaction system 150, the second reaction system 160, the third reaction system 170 and the fourth reaction system 180, respectively recovers the four kinds of heavy metal ions of zinc ions, copper ions, nickel ions and chromium ions in the copper foil wastewater 500, and according to the different kinds of metal ions recovered by each reaction system 120, the concentration of sulfuric acid added in the reaction tank 121 of the first reaction system 150 and the second reaction system 160 is 1% to 2%, and the PH value range in the reaction tank 121 of the first reaction system 150 is 1.25 to 1.6, so that the reaction tank 121 of the first reaction system 150 provides a reaction environment suitable for the zinc ions in the copper foil wastewater 500 to easily dissolve and diffuse in the corresponding extractant 300, the PH value range in the reaction tank 121 of the second reaction system 160 is 0.8 to 1.3, so that the reaction tank 121 of the second reaction system 160 provides a reaction environment suitable for the copper ions in the copper foil wastewater 500 to easily dissolve and diffuse in the corresponding extractant 300.

[0035] The sodium carbonate or sodium bicarbonate is added in the reaction tank 121 of the third reaction system 170 and the fourth reaction system 180, the PH value range in the reaction tank 121 of the third reaction system 170 is 5 to 5.6, so that the reaction tank 121 of the third reaction system 170 provides a reaction environment suitable for the nickel ions in the copper foil wastewater 500 to easily dissolve and diffuse in the corresponding extractant 300; the PH value range in the reaction tank 121 of the fourth reaction system 180 is 5.7 to 6.2, so that the reaction tank 121 of the fourth reaction system 180 provides a reaction environment suitable for the chromium ions to easily dissolve and diffuse in the corresponding extractant 300.

[0036] In the first reaction system 150 and the fourth reaction system 180, the extractant 300 in the extraction tank 130 includes a mixture of methyltrioctylammonium chloride and methyltrioctylammonium chloride, wherein the stripping agent 400 in the extraction tank 130 in the first reaction system 150 is sodium hydroxide aqueous solution, and the stripping agent 400 in the extraction tank 130 in the fourth reaction system 180 is sulfuric acid aqueous solution. In this way, in the first reaction system 150, after the extractant 300 enters the reaction tank 121 and mixes with the copper foil wastewater 500, the zinc ions in the copper foil wastewater 500 can dissolve and diffuse into the extractant 300, and the zinc ions are extracted by the stripping agent 400, so that the first reaction system 150 recovers the copper ions; in the fourth reaction system 180, after the extractant 300 enters the reaction tank 121 and mixes with the copper foil wastewater 500, the chromium ions in the copper foil wastewater 500 can dissolve and diffuse into the extractant 300, and the chromium ions are extracted by the stripping agent 400, so that the fourth reaction system 180 recovers the chromium ions.

[0037] The extractant 300 in the extraction tank 130 in the second reaction system 160 and the third reaction system 170 comprises a mixture of 2-hydroxy-5-dodecyl salicyl aldehyde oxime and 2-hydroxy-5-nonyl phenylacetone oxime, and the stripping agent 400 is an aqueous sulfuric acid solution. In this way, in the second reaction system 160, after the extractant 300 in the extraction tank 130 enters the reaction tank 121 and mixes with the copper foil wastewater 500, the copper ions in the copper foil wastewater 500 can dissolve and diffuse into the extractant 300, and the copper ions can be extracted by the stripping agent 400, so that the second reaction system 160 can recover the copper ions. In the third reaction system 170, after the extractant 300 in the extraction tank 130 enters the reaction tank 121 and mixes with the copper foil wastewater 500, the nickel ions in the copper foil wastewater 500 can dissolve and diffuse into the extractant 300, and the nickel ions can be extracted by the stripping agent 400, so that the third reaction system 170 can recover the nickel ions.

[0038] In the first reaction system 150, the concentration of the extractant 300 in the extraction tank 130 is between 5% and 13%; in the second reaction system 160, the concentration of the extractant 300 in the extraction tank 130 is between 2% and 7%; in the fourth reaction system 180 and the third reaction system 170, the concentration of the extractant 300 in the extraction tank 130 is 10%; and in the first reaction system 150, the second reaction system 160, the third reaction system 170, and the fourth reaction system 180, the mixing ratio of the extractant 300 to kerosene is between 1:1 and 1:1.2. In this way, the reaction effect of the extractant 300 and the copper foil wastewater 500 in each reaction system 120 can be improved, so that the corresponding metal ions in the copper foil wastewater 500 can dissolve and diffuse into the extractant 300, and each reaction system 120 can recover different types of metal ions.

[0039] In the extractant 300 in the first reaction system 150 and the fourth reaction system 180, the concentration of methyltrioctylammonium chloride is between 75% and 90%, and the concentration of methyltrioctylammonium chloride is between 10% and 25%; the concentration of the stripping agent 400 in the first reaction system 150 is between 5% and 10%; the concentration of the stripping agent 400 in the second reaction system 160 is between 35% and 55%; the concentration of the stripping agent 400 in the third reaction system 170 is between 10% and 23%; and the concentration of the stripping agent 400 in the fourth reaction system 180 is between 8% and 11.3%. In this way, the first reaction system 150 to the fourth reaction system 180 can extract and recover zinc, copper, nickel, and chromium, respectively.

[0040] In addition, since the third filter membrane 124 in the reaction tank 121 of each reaction system 120 needs to separate the copper foil wastewater 500 mixed with the extractant 300 and the copper foil wastewater 500 not mixed with the extractant 300, a certain pressure difference condition is required, therefore, in the first reaction system 150 to the fourth reaction system 180 of the present application, the pressure in each reaction tank 121 is sequentially different by a preset pressure value, and the preset pressure value ranges between 0.01 MPa and 0.3 MPa.

[0041] In this way, the third filter membrane 124 in the reaction tank 121 of the four reaction systems 120 can separate the mixed copper foil wastewater 500 from the un-mixed copper foil wastewater 500 after the extractant 300 for selectively extracting zinc in the first reaction system 150 is mixed with the copper foil wastewater 500, separate the mixed copper foil wastewater 500 from the un-mixed copper foil wastewater 500 after the extractant 300 for selectively extracting copper in the second reaction system 160 is mixed with the copper foil wastewater 500, separate the mixed copper foil wastewater 500 from the un-mixed copper foil wastewater 500 after the extractant 300 for selectively extracting nickel in the third reaction system 170 is mixed with the copper foil wastewater 500, and separate the mixed copper foil wastewater 500 from the un-mixed copper foil wastewater 500 after the extractant 300 for selectively extracting chromium in the fourth reaction system 180 is mixed with the copper foil wastewater 500; at the same time, the separation efficiency of the copper foil wastewater 500 mixed with the extractant 300 from the un-mixed copper foil wastewater 500 in each reaction system 120 can be accelerated, thereby improving the efficiency of the copper foil wastewater treatment device 100 in treating the copper foil wastewater 500.

[0042] In addition, a one-way valve 600 can also be installed on the pipeline connected between the reaction tanks 121 of the adjacent two reaction systems 120, and the one-way valve 600 is used to prevent the copper foil wastewater 500 in the reaction tank 121 of each reaction system 120 from flowing back to the previous reaction system 120.

[0043] Further, the bottom of the reaction tank 121 in the fourth reaction system 180 is provided with a backflow port 181, and the wastewater pool 110 and the backflow port 181 are connected through a backflow pipeline 182; after the chromium metal recovery in the fourth reaction system 180 is completed, the copper foil wastewater 500 in the reaction tank 121 flows into the wastewater pool 110 through the backflow pipeline 182, and re-enters the reaction tank 121 of the first reaction system 150.

[0044] The application connects the reaction tank 121 of the fourth reaction system 180 to the wastewater pool 110 through the reflux pipeline 182, so that the copper foil wastewater 500 is treated in the first reaction system 150, the second reaction system 160, the third reaction system 170 and the fourth reaction system 180 in turn, and then the treated copper foil wastewater 500 flows back to the wastewater pool 110 through the reflux pipeline 182, and then enters the first reaction system 150 again through the wastewater pool 110 for continuous circulation reaction, so that the copper foil wastewater 500 is treated multiple times by the entire copper foil wastewater treatment device 100, compared with only one treatment of the copper foil wastewater 500, multiple treatments can better recover heavy metal ions in the copper foil wastewater 500, and further reduce pollution to the environment, so that the copper foil wastewater 500 can be reused, and energy is effectively saved.

[0045] Figure 2 As shown in the block diagram of an embodiment of the electrolytic copper foil production system of the application, Figure 2 As shown in the block diagram of an embodiment of the electrolytic copper foil production system of the application,

[0046] However, the copper foil wastewater 500 produced by electroplating flushing contains a large amount of heavy metals, which may cause resource waste and environmental pollution if not effectively recovered.

[0047] Based on the above problems, the copper foil wastewater treatment device 100 in the electrolytic copper foil production system 10 is improved: a plurality of reaction systems 120 are arranged, and each reaction system 120 is sequentially connected, so that the copper foil wastewater 500 in the wastewater tank 110 can sequentially enter each reaction system 120 for reaction, and each reaction system 120 is provided with a reaction tank 121, an extraction tank 130 and a recovery tank 140, and the extraction agent 300 corresponding to the metal ions to be extracted and the stripping agent 400 are added in the extraction tank 130, when the copper foil wastewater 500 enters the reaction tank 121, the negative pressure device 141 controls the air pressure in the reaction tank 121 and the extraction tank 130 to reach the first preset air pressure, at this time, the extraction agent 300 in the extraction tank 130 enters the reaction tank 121 under the action of air pressure, and is mixed with the copper foil wastewater 500, and the corresponding metal ions in the copper foil wastewater 500 will be dissolved in the extraction agent 300; at this time, the negative pressure device 141 controls the air pressure in the reaction tank 121 and the extraction tank 130 to reach the second preset air pressure, so that the copper foil wastewater 500 mixed with the extraction agent 300 enters the extraction tank 130 under the action of air pressure, and is mixed with the stripping agent 400 in the extraction tank 130, and the corresponding metal ions are extracted after reaction with the corresponding stripping agent 400, and then are recovered through the recovery tank 140, and the un-mixed copper foil wastewater 500 is pushed into the next reaction system 120 under the action of air pressure to extract the corresponding metal ions, so that the copper foil wastewater 500 sequentially passes through the plurality of reaction systems 120 for reaction, realizing the cyclic treatment of the copper foil wastewater 500, so as to extract different kinds of metal ions in the copper foil wastewater 500, reduce the heavy metal pollution of the copper foil wastewater 500, and also realize the recycling of the heavy metal ions, thereby reducing the pollution of the electrolytic copper foil production system 10 to the environment and improving the energy recycling.

[0048] It should be noted that the inventive concept of the present application can form a very large number of embodiments, but the length of the application file is limited and cannot list them one by one, so the above described embodiments or technical features can be combined to form new embodiments without conflict, and the combination of each embodiment or technical feature will enhance the original technical effect.

[0049] The above is a further detailed description of the present application in combination with specific optional embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which should be regarded as falling within the protection scope of the present application.

Claims

1. A copper foil wastewater treatment device, comprising a wastewater tank for holding copper foil wastewater; characterized in that, The copper foil wastewater treatment device also includes multiple reaction systems connected in sequence; each reaction system includes a reaction tank, an extraction tank, and a recovery tank. The reaction tank is connected to the extraction tank, and the extraction tank is connected to the recovery tank. The reaction tanks of adjacent reaction systems are interconnected. The extraction tank is equipped with an extractant and a back-extraction agent, and the types of extractants in adjacent reaction systems are different. A negative pressure device is connected between the reaction tank and the extraction tank to control the air pressure between the reaction tank and the extraction tank. The wastewater tank is connected to the reaction tank in the reaction system near the wastewater tank; when the copper foil wastewater enters the reaction tank, the negative pressure device controls the air pressure in the reaction tank to reach the first preset air pressure, and the extractant enters the reaction tank and mixes with the copper foil wastewater; After the copper foil wastewater is mixed with the extractant, the negative pressure device controls the air pressure in the reaction tank to reach a second preset air pressure. The mixed copper foil wastewater enters the extraction tank, where the back-extraction agent mixes with the mixed copper foil wastewater to obtain the metal ions to be extracted. The recovery tank recovers the metal ions to be extracted. The reaction tank then passes the unmixed copper foil wastewater into the next reaction tank of the reaction system for further reaction. The first preset air pressure refers to the negative pressure device controlling the air pressure in the reaction tank to be lower than the air pressure in the extraction tank, so that there is a pressure difference between the reaction tank and the extraction tank. Under the action of the pressure difference, the extractant in the extraction tank enters the reaction tank and mixes with the copper foil wastewater. The second preset air pressure refers to the negative pressure device controlling the air pressure in the reaction tank to be greater than the air pressure in the extraction tank, so that there is a pressure difference between the reaction tank and the extraction tank. Under the action of the pressure difference, the copper foil wastewater mixed with the extractant in the reaction tank enters the extraction tank and mixes with the back extractant. The reaction vessel includes a reaction vessel body and a third filter membrane. The third filter membrane is laid inside the reaction vessel body and is used to separate copper foil wastewater after it is mixed with the extractant.

2. The copper foil wastewater treatment device as described in claim 1, characterized in that, The extraction tank includes a tank body, and the top of the tank body is provided with an addition port for adding the extractant and the back-extraction agent; The tank is provided with a first filter membrane layer and a second filter membrane layer. The filtration accuracy of the first filter membrane layer is between 5 μm and 10 μm. The second filter membrane layer includes an oil-water separation ceramic ultrafiltration membrane. The filtration accuracy of the second filter membrane layer is between 0.01 μm and 0.1 μm. A stirring device is also provided between the first filter membrane layer and the second filter membrane layer, the stirring device being used to mix the extractant and the back-extraction agent.

3. The copper foil wastewater treatment device as described in claim 2, characterized in that, The reaction vessel also includes a stirring paddle, which is located in the middle of the reaction vessel body and is used to stir the copper foil wastewater and the extractant; an acidic solution is also added to the reaction vessel body to adjust the pH value of the reaction vessel body.

4. The copper foil wastewater treatment device as described in claim 3, characterized in that, The acidic solution includes sulfuric acid; the reaction system includes a first reaction system, a second reaction system, a third reaction system, and a fourth reaction system, wherein the first reaction system is used to extract zinc ions, the second reaction system is used to extract copper ions, the third reaction system is used to extract nickel ions, and the fourth reaction system is used to extract chromium ions. Both the first and second reaction systems contain sulfuric acid at a concentration ranging from 1% to 2%. The pH value in the reaction tank of the first reaction system ranges from 1.25 to 1.6, and the pH value in the reaction tank of the second reaction system ranges from 0.8 to 1.

3. Sodium carbonate or sodium bicarbonate is added to the reaction vessels of both the third and fourth reaction systems; the pH value in the reaction vessel of the third reaction system is between 5 and 5.6; and the pH value in the reaction vessel of the fourth reaction system is between 5.7 and 6.

2.

5. The copper foil wastewater treatment device as described in claim 4, characterized in that, In both the first and fourth reaction systems, the extractant in the extraction tank comprises a mixture of methyltrioctylammonium chloride and methyltridecylammonium chloride. In the first reaction system, the back-extraction agent in the extraction tank is an aqueous sodium hydroxide solution, and in the fourth reaction system, the back-extraction agent in the extraction tank is an aqueous sulfuric acid solution. In both the second and third reaction systems, the extractant in the extraction tank comprises a mixture of 2-hydroxy-5-dodecyl salicylaldehyde oxime and 2-hydroxy-5-nonylacetophenone oxime, and the back-extraction agent is an aqueous sulfuric acid solution.

6. The copper foil wastewater treatment device as described in claim 5, characterized in that, In the first reaction system, the concentration of the extractant in the extraction tank is between 5% and 13%; In the second reaction system, the concentration of the extractant in the extraction tank is between 2% and 7%; In both the fourth and third reaction systems, the concentration of the extractant in the extraction tank is 10%. In the first reaction system, the second reaction system, the third reaction system, and the fourth reaction system, the mixing ratio of the extractant to kerosene is between 1:1 and 1:1.

2.

7. The copper foil wastewater treatment device as described in claim 6, characterized in that, In the extractants of the first reaction system and the fourth reaction system, the concentration range of methyltrioctylammonium chloride is between 75% and 90%, and the concentration range of methyltridecylammonium chloride is between 10% and 25%. The concentration of the back-extractant in the first reaction system is between 5% and 10%; the concentration of the back-extractant in the second reaction system is between 35% and 55%; the concentration of the back-extractant in the third reaction system is between 10% and 23%; and the concentration of the back-extractant in the fourth reaction system is between 8% and 11.3%.

8. The copper foil wastewater treatment device as described in claim 7, characterized in that, In the first to the fourth reaction systems, the pressure in each reaction vessel differs by a preset pressure value, which ranges from 0.01 MPa to 0.3 MPa.

9. The copper foil wastewater treatment device as described in claim 8, characterized in that, In the fourth reaction system, a reflux port is provided at the bottom of the reaction tank, and the wastewater pool is connected to the reflux port through a reflux pipe. After the chromium metal recovery of the fourth reaction system is completed, the copper foil wastewater in the reaction tank flows into the wastewater pool through the reflux pipe and re-enters the reaction tank of the first reaction system.

10. An electrolytic copper foil production system, comprising a copper foil surface treatment device, characterized in that, The electrolytic copper foil production system further includes a copper foil wastewater treatment device as described in any one of claims 1 to 9, wherein the copper foil wastewater treatment device is connected to the copper foil surface treatment device.

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