Recovery method

Abstract

The application provides a recovery method, comprising the following steps: a water washing liquid flows out from a water washing device and sequentially flows into a recovery device, a pretreatment device and a first reverse osmosis device; filtered water flowing out from the first reverse osmosis device sequentially flows into a water production device and a second reverse osmosis device; concentrated salt reaching a first target conductivity flows from the first reverse osmosis device into a management tank; concentrated salt not reaching the first target conductivity is backflowed to the pretreatment device, and the concentrated salt backflowed into the pretreatment device continues to be filtered by the first reverse osmosis device; filtered water reaching a second target conductivity is backflowed to the water washing device through a second three-way valve, and then the concentrated salt is backflowed from a second concentrated salt outlet of the second reverse osmosis device to the pretreatment device; filtered water not reaching the second target conductivity is backflowed to the water production device, and the filtered water backflowed into the water production device continues to be filtered by the second reverse osmosis device. The recovery method is beneficial to the closed-loop recovery of salt and water in the rinsing liquid, thereby reducing the production cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electroplating liquid recycling treatment, and particularly relates to a recycling method. BACKGROUND

[0002] The rinsing water of the electroplated part contains a large amount of electroplating salt, and the electroplating salt contains metal ions such as nickel ions. Direct discharge of the rinsing water will cause environmental pollution and is not conducive to recycling of the water and the electroplating salt, thereby causing resource waste. SUMMARY

[0003] In order to overcome the deficiencies of the prior art, the purpose of the present application is to provide a recycling method, which is beneficial to closed-loop recycling of the salt and water in the water washing liquid generated by rinsing the electroplated part, thereby reducing the production cost.

[0004] To solve the above problems, the technical scheme adopted by the present application is as follows:

[0005] A recycling method comprises the following steps:

[0006] The water washing liquid generated by rinsing the electroplated part flows out from the water washing device and sequentially flows into the recycling device, the pretreatment device and the first reverse osmosis device;

[0007] The filtered water generated after being filtered by the first reverse osmosis device flows out through the first filtered water outlet and sequentially flows into the water production device and the second reverse osmosis device;

[0008] The first conductivity meter is used to measure the conductivity of the liquid inlet of the first reverse osmosis device, the second conductivity meter is used to measure the conductivity of the filtered water output by the first reverse osmosis device, and whether the concentrated salt output by the first reverse osmosis device reaches the first target conductivity is determined according to the measured value of the first conductivity meter, and whether the first reverse osmosis device is normally filtered is determined according to the measured value of the second conductivity meter;

[0009] The concentrated salt reaching the first target conductivity flows into the management tank through the first three-way valve from the first concentrated salt outlet of the first reverse osmosis device, and then pure water is introduced from the first water inlet of the water production device to maintain the circulating water level;

[0010] The concentrated salt not reaching the first target conductivity flows back to the pretreatment device through the first three-way valve from the first concentrated salt outlet, and the concentrated salt flowing back into the pretreatment device continues to be filtered by the first reverse osmosis device. The concentrated salt circulates between the pretreatment device and the first reverse osmosis device until the conductivity of the concentrated salt reaches the first target conductivity;

[0011] The conductivity of the filtered water flowing out of the second purified water outlet of the second reverse osmosis device is measured using a third conductivity meter, and the filtered water reaching the second target conductivity is returned to the water washing device through a second three-way valve, after which the concentrated salt is returned to the pretreatment device from the second concentrated salt outlet of the second reverse osmosis device, and the filtering and returning step of the first reverse osmosis device is repeated;

[0012] The filtered water that does not reach the second target conductivity is returned to the water production device, and the filtered water returned to the water production device continues to be filtered by the second reverse osmosis device, and the filtered water circulates between the water production device and the second reverse osmosis device until the conductivity of the filtered water reaches the second target conductivity.

[0013] In some possible embodiments, further comprising:

[0014] A filter is used to filter solid impurities between the liquid outlet of the recovery device and the liquid inlet of the pretreatment device.

[0015] In some possible embodiments, the second purified water outlet is connected to the pretreatment device and the port of the second three-way valve leading to the water production device through a third three-way valve, the third three-way valve is connected between the second concentrated salt outlet and the pretreatment device, the ports connected by the third three-way valve and the second three-way valve are connected to a fourth three-way valve, one outlet of the fourth three-way valve is connected to the water production device, and the other outlet leads to a waste liquid discharge, and the recovery method further comprises the steps of:

[0016] A cleaning liquid is introduced from the first cleaning port of the water production device, the cleaning liquid flows into the second reverse osmosis device to clean the permeable membrane, and the trapped cleaning liquid is discharged to the waste liquid discharge through the third three-way valve and the fourth three-way valve from the second concentrated salt outlet;

[0017] The second reverse osmosis device after being cleaned by the pure water washing cleaning liquid is introduced from the first water inlet, the filtered water after washing is discharged to the waste liquid discharge through the second purified water outlet and the fourth three-way valve, and the trapped part of the aqueous solution is discharged to the waste liquid discharge through the third three-way valve and the fourth three-way valve.

[0018] In some possible embodiments, the first purified water outlet is connected to the water production device and the port of the first three-way valve leading to the pretreatment device through a fifth three-way valve, the fifth three-way valve is connected between the first purified water outlet and the water production device, the ports connected by the fifth three-way valve and the first three-way valve are connected to a sixth three-way valve, one outlet of the sixth three-way valve is connected to the pretreatment device, and the other outlet leads to a waste liquid discharge, and the recovery method further comprises:

[0019] The second cleaning port of the pretreatment device is connected to a cleaning liquid, the cleaning liquid flows into the first reverse osmosis device to clean the permeable membrane, and the trapped cleaning liquid is discharged from the first concentrated salt outlet through the first three-way valve and the sixth three-way valve to the waste liquid discharge.

[0020] The second water inlet of the pretreatment device is connected to a pure water washing cleaning liquid to clean the first reverse osmosis device, and the filtered water after washing is discharged from the first clean water outlet, the fifth three-way valve and the sixth three-way valve to the waste liquid discharge.

[0021] In some possible embodiments, the number of the first reverse osmosis devices is at least two, the at least two first reverse osmosis devices are connected in parallel, the liquid flowing out of the pretreatment device is divided into the at least two first reverse osmosis devices, and the liquids flowing out of the at least two first reverse osmosis devices are combined and then flow into a target device.

[0022] In some possible embodiments, the number of the second reverse osmosis devices is at least two, the at least two second reverse osmosis devices are connected in parallel, the liquid flowing out of the water production device is divided into the at least two second reverse osmosis devices, and the liquids flowing out of the at least two second reverse osmosis devices are combined and then flow into a target device.

[0023] In some possible embodiments, the method further comprises:

[0024] The first flow meter is used to measure the flow rate of the concentrated salt flowing back into the pretreatment device, the second flow meter is used to measure the flow rate of the pure water entering the water production device, and the third flow meter is used to measure the flow rate of the pure water flowing back to the water washing device.

[0025] When the measured value of the first flow meter becomes 0, the step of introducing pure water from the first water inlet to maintain the water level is performed, and the third flow meter is adjusted according to the measured value of the second flow meter to adjust the water inlet speed of the pure water, so that the flow rate flowing back to the water washing device is equivalent to the measured flow rate of the first flow meter.

[0026] In some possible embodiments, the method further comprises:

[0027] The first delivery pump is used to pump the liquid flowing out of the recovery device into the filter;

[0028] The second delivery pump is used to pump the liquid flowing out of the pretreatment device into the first reverse osmosis device;

[0029] The third delivery pump is used to pump the liquid flowing out of the water production device into the second reverse osmosis device.

[0030] In some possible embodiments, the method further comprises:

[0031] A cleaning liquid dosing machine is used to deliver cleaning liquid to the first cleaning port and the second cleaning port.

[0032] In some possible embodiments, the permeation membrane of the first reverse osmosis device is prepared by the following method:

[0033] The polysulfone-based membrane is immersed in a mesitylene mixed solution, the mesitylene mixed solution comprising mesitylene, graphene oxide and water, the mass fraction of the mesitylene being 15%-35%, and the mass fraction of the graphene oxide being 5%-10%;

[0034] The immersed polysulfone-based membrane is contacted with an isophthaloyl dichloride organic solution to perform a polymerization reaction, the mass fraction of the isophthaloyl dichloride in the isophthaloyl dichloride organic solution being 20%-50%, and the isophthaloyl dichloride: the mesitylene being 1.7-2:1 in terms of the amount of substance;

[0035] After the polymerization is completed, a heating treatment is performed, the heat treatment temperature being 65-70 DEG C, and the heat treatment time being 5-10 minutes.

[0036] Compared with the prior art, the application has the beneficial effects that:

[0037] In the application, the recovery method controls the circulation of the washing liquid among the washing device, the recovery device, the pretreatment device, the first reverse osmosis device, the water production device and the second reverse osmosis device, so that the salt and water in the washing liquid produced by rinsing the plated workpiece can be recycled, thereby reducing the production cost. In addition, using multiple conductivity meters to measure the conductivity facilitates intuitive understanding of the filtration of the washing liquid, and the first three-way valve and the second three-way valve facilitate adjustment of the backflow direction of the backflow liquid according to the filtration.

[0038] The application will be further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 The accompanying drawings are provided for the communication schematic diagram of the recovery equipment matched with the recovery method provided in the application.

[0040] Explanation of reference signs:

[0041] 10 - water washing device; 20 - recovery device; 23 - filter; 230 - first delivery pump; 30 - pretreatment device; 31 - second water inlet valve; 301 - second water inlet; 302 - second cleaning port; 34 - second delivery pump; 40 - first reverse osmosis device; 41 - first three-way valve; 401 - first concentrated salt outlet; 402 - first clean water outlet; 42 - sixth three-way valve; 43 - fifth three-way valve; 50 - water production device; 501 - first water inlet; 502 - first cleaning port; 51 - first water inlet valve; 56 - third delivery pump; 60 - second reverse osmosis device; 601 - second clean water outlet; 602 - second concentrated salt outlet; 61 - second three-way valve; 62 - third three-way valve; 63 - fourth three-way valve; 70 - management tank; 80 - cleaning liquid dosing machine; 340 - first conductivity meter; 420 - second conductivity meter; 610 - third conductivity meter. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] The terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish different objects, and are not used to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be a middle element. When an element is referred to as "provided on" another element, it can be provided on the other element or there can be a middle element.

[0044] An embodiment of the present application provides a recovery method, which can be used for recovering and treating rinse liquid of electroplated parts. The recovery method comprises the following steps.

[0045] The water washing liquid generated by rinsing the electroplated parts flows out from the water washing device 10 and sequentially flows into the recovery device 20, the pretreatment device 30, and the first reverse osmosis device 40.

[0046] In some embodiments, a filter 23 is used to filter solid impurities between the liquid outlet of the recovery device 20 and the liquid inlet of the pretreatment device 30, so as to avoid the solid impurities from entering the subsequent device for circulation.

[0047] In some embodiments, a first delivery pump 230 is used to pump the liquid flowing out of the recovery device 20 into the filter 23, and a second delivery pump 34 is used to pump the liquid flowing out of the pretreatment device 30 into the first reverse osmosis device 40, so as to improve the delivery power.

[0048] The filtered water produced by the first reverse osmosis device 40 flows out through a first filtered water outlet 402 and sequentially flows into the water production device 50 and the second reverse osmosis device 60. In some embodiments, a third delivery pump 56 is used to pump the liquid flowing out of the water production device 50 into the second reverse osmosis device 60. Pumping the liquid by using the delivery pump can improve the delivery power, thereby improving the filtering efficiency.

[0049] A first conductivity meter 340 is used to measure the conductivity of the liquid flowing into the first reverse osmosis device 40, and a second conductivity meter 420 is used to measure the conductivity of the filtered water flowing out of the first reverse osmosis device 40. The measurement value of the first conductivity meter 340 is used to determine whether the concentrated salt flowing out of the first reverse osmosis device 40 reaches the first target conductivity, and the measurement value of the second conductivity meter 420 is used to determine whether the first reverse osmosis device 40 is filtering normally.

[0050] The concentrated salt reaching the first target conductivity flows from a first concentrated salt outlet 401 of the first reverse osmosis device 40 into the management tank 70 through a first three-way valve 41. Then, pure water is introduced from a first water inlet 501 of the water production device 50 to maintain the circulating water level, i.e., the pure water introduced from the water production device 50 flows back into the first reverse osmosis device 40 through the second reverse osmosis device 60, the water washing device 10, the recovery device 20, and the pretreatment device 30 to maintain the water level in the circulating process.

[0051] The concentrated salt not reaching the first target conductivity flows from the first concentrated salt outlet 401 back into the pretreatment device 30 through the first three-way valve 41. The concentrated salt flowing back into the pretreatment device 30 continues to be filtered by the first reverse osmosis device 40. The concentrated salt circulates between the pretreatment device 30 and the first reverse osmosis device 40 until the conductivity of the concentrated salt reaches the first target conductivity. The concentrated salt reaching the first target conductivity flows into the management tank 70 again.

[0052] A third conductivity meter 610 is used to measure the conductivity of the filtered water flowing out of a second filtered water outlet 601 of the second reverse osmosis device 60. The filtered water reaching a second target conductivity flows back into the water washing device 10 through a second three-way valve 61. The pure water flowing back into the water washing device 10 can be used as new rinsing water. Then, the concentrated salt flows from a second concentrated salt outlet 602 of the second reverse osmosis device 60 back into the pretreatment device 30, and the filtering and backflow step of the first reverse osmosis device 40 is repeated.

[0053] The filtered water that has not reached the second target conductivity is returned to the water production device 50, and the filtered water returned to the water production device 50 is further filtered by the second reverse osmosis device 60. The filtered water is circulated between the water production device 50 and the second reverse osmosis device 60 until the filtered water reaches the second target conductivity. In an example, the second target conductivity can be less than the first target conductivity.

[0054] In some embodiments, a first flow meter is used to measure the flow rate of the concentrated salt returned to the pretreatment device 30, a second flow meter is used to measure the flow rate of the pure water into the water production device 50, and a third flow meter is used to measure the flow rate of the pure water returned to the water washing device 10 from the second clean water outlet 601. When the measured value of the first flow meter becomes zero, i.e., the concentrated salt flows into the management tank 70 (the flow rate into the management tank 70 is equivalent to the flow rate returned to the pretreatment device 30), the step of circulating the pure water from the first water inlet 501 to maintain the water level is performed, and the flow rate of the pure water returned to the water washing device 10 is adjusted according to the measured value of the second flow meter so that the flow rate measured by the first flow meter is equivalent to the flow rate returned. That is, the amount output to the management tank 70 is ensured to be equivalent to the amount of the circulating pure water replenished, so that the circulating water level of the entire system is maintained unchanged.

[0055] In some embodiments, the second clean water outlet 601 is connected to the pretreatment device 30 and the water production device 50 through a third three-way valve 62 connected between the second concentrated salt outlet 602 and the pretreatment device 30, and the outlet of the third three-way valve 62 is connected to the water production device 50 and the other outlet is connected to a waste liquid discharge. The recovery method further comprises the steps of:

[0056] The cleaning liquid is introduced from the first cleaning port 502 of the water production device 50, the cleaning liquid flows into the second reverse osmosis device 60 to clean the permeation membrane, and the trapped cleaning liquid is discharged from the second concentrated salt outlet 602 to the waste liquid discharge through the third three-way valve 62 and the fourth three-way valve 63.

[0057] The pure water is introduced from the first water inlet 501 to wash the second reverse osmosis device 60 after the cleaning of the cleaning liquid, the filtered water after washing is discharged from the second clean water outlet 601 and the fourth three-way valve 63 to the waste liquid discharge, and the trapped portion of the aqueous solution is discharged from the third three-way valve 62 and the fourth three-way valve 63 to the waste liquid discharge. It can be understood that the cleaning step of the second reverse osmosis device 60 can be performed before or after the circulation of the water washing liquid to remove impurities or residues on the reverse osmosis membrane.

[0058] In some embodiments, the first purified water outlet 402 is connected to the water production device 50 and the first three-way valve 41 through a fifth three-way valve 43, the fifth three-way valve 43 is connected between the first purified water outlet 402 and the water production device 50, the fifth three-way valve 43 and the first three-way valve 41 are connected to the sixth three-way valve 42, one outlet of the sixth three-way valve 42 is connected to the pretreatment device 30, and the other outlet is connected to the waste liquid discharge, and the recovery method further comprises:

[0059] The cleaning liquid is introduced from the second cleaning port 302 of the pretreatment device, the cleaning liquid flows into the first reverse osmosis device 40 to clean the permeable membrane, and the trapped cleaning liquid is discharged to the waste liquid discharge through the first three-way valve 41 and the sixth three-way valve 42.

[0060] The purified water washing liquid is introduced from the second water inlet 301 of the pretreatment device 30 to clean the first reverse osmosis device 40, and the filtered water after washing is discharged to the waste liquid discharge through the first purified water outlet 402, the fifth three-way valve 43 and the sixth three-way valve 42. It can be understood that the cleaning step of the first reverse osmosis device 40 can be performed before or after the water washing liquid circulation to remove impurities or residues on the reverse osmosis membrane.

[0061] In some embodiments, the number of first reverse osmosis devices 40 is at least two, the at least two first reverse osmosis devices 40 are connected in parallel, the liquid flowing out of the pretreatment device 30 is divided into the at least two first reverse osmosis devices 40, and the liquids flowing out of the at least two first reverse osmosis devices 40 are combined and then flow into a target device (such as the pretreatment device 30 or the water production device 50).

[0062] In some embodiments, the number of second reverse osmosis devices 60 is at least two, the at least two second reverse osmosis devices 60 are connected in parallel, the liquid flowing out of the water production device 50 is divided into the at least two second reverse osmosis devices 60, and the liquids flowing out of the at least two second reverse osmosis devices 60 are combined and then flow into a target device (such as the water production device 50 or the water washing device 10). Increasing the number of second reverse osmosis devices 60 and first reverse osmosis devices 40 and connecting them in parallel can improve the filtering efficiency.

[0063] In some embodiments, the cleaning liquid is delivered to the first cleaning port 502 and the second cleaning port 302 by using a cleaning liquid dosing machine 80, thereby reducing the labor intensity.

[0064] In some embodiments, the permeable membrane of the first reverse osmosis device 40 is prepared by immersing a polysulfone-based membrane in a mesitylene mixed solution, the mesitylene mixed solution comprises mesitylene, graphene oxide and water, the mass fraction of the mesitylene is 15% to 35%, and the mass fraction of the graphene oxide is 5% to 10%.

[0065] The immersed polysulfone-based membrane is contacted with an isophthaloyl dichloride organic solution to perform a polymerization reaction, the mass fraction of isophthaloyl dichloride in the isophthaloyl dichloride organic solution is 20%-50%, and the molar ratio of the isophthaloyl dichloride to the mesitylene is 1.7-2:1.

[0066] After the polymerization is completed, a heat treatment is performed, the heat treatment temperature is 65°C-70°C, and the heat treatment time is 5-10 minutes.

[0067] For example, in Example 1, the permeation membrane of the first reverse osmosis device 40 is prepared by immersing a polysulfone-based membrane in a mesitylene mixed solution including mesitylene, graphene oxide, and water, the mass fraction of the mesitylene is 15%, and the mass fraction of the graphene oxide is 8%. The immersed polysulfone-based membrane is contacted with an isophthaloyl dichloride organic solution to perform a polymerization reaction, the mass fraction of isophthaloyl dichloride in the isophthaloyl dichloride organic solution is 25%, and the molar ratio of the isophthaloyl dichloride to the mesitylene is 1.7:1. After the polymerization is completed, a heat treatment is performed, the heat treatment temperature is 65°C, and the heat treatment time is 5 minutes.

[0068] In Example 2, different from Example 1, in the preparation of the permeation membrane of the first reverse osmosis device 40, the mass fraction of the mesitylene is 18%, the mass fraction of the graphene oxide is 5%, the mass fraction of isophthaloyl dichloride is 30%, and the molar ratio of the isophthaloyl dichloride to the mesitylene is 2:1. The heat treatment temperature is 70°C, and the heat treatment time is 10 minutes.

[0069] In Example 3, different from Example 1, in the preparation of the permeation membrane of the first reverse osmosis device 40, the mass fraction of the mesitylene is 35%, the mass fraction of the graphene oxide is 10%, the mass fraction of isophthaloyl dichloride is 50%, and the molar ratio of the isophthaloyl dichloride to the mesitylene is 1.8:1. The heat treatment temperature is 70°C, and the heat treatment time is 10 minutes.

[0070] The permeation membrane provided in the application has a high desalination rate, so that the conductivity of the rinse water with a conductivity of 6000 μs / cm after the circulation treatment is recovered to 10 μs / cm (the level of pure water).

[0071] For example, the second reverse osmosis device 60 can use an existing commercial permeation membrane.

[0072] In the present application, the recovery method is to control the circulation of the washing liquid among the washing device 10, the recovery device 20, the pretreatment device 30, the first reverse osmosis device 40, the water production device 50 and the second reverse osmosis device 60, so that the salt and water in the washing liquid produced by rinsing the electroplated parts can be recycled, thereby reducing the production cost. The use of multiple conductivity meters to measure the conductivity facilitates intuitive understanding of the filtration of the washing liquid, and the setting of the first three-way valve 41 and the second three-way valve 61 facilitates adjusting the reflux direction of the reflux liquid according to the filtration condition.

[0073] Specifically, referring to Figure 1 , the recovery equipment adapted to the recovery method comprises the washing device 10, the recovery device 20, the pretreatment device 30, the first reverse osmosis device 40, the water production device 50 and the second reverse osmosis device 60 connected in sequence. That is, the liquid inlet of the recovery device 20 is connected to the liquid outlet of the washing device 10 for receiving the washing liquid flowing out, the liquid inlet of the pretreatment device 30 is connected to the liquid outlet of the recovery device 20 for receiving the recovery liquid flowing out, the liquid inlet of the first reverse osmosis device 40 is connected to the liquid outlet of the pretreatment device 30, and the liquid inlet of the second reverse osmosis device 60 is connected to the liquid outlet of the water production device 50.

[0074] The washing device 10 is used for washing the electroplated parts. The first reverse osmosis device 40 has a first concentrated salt water outlet 401 and a first pure water outlet 402, the first concentrated salt water outlet 401 is connected to the pretreatment device 30 and the management tank 70 through the first three-way valve 41, and the water production device 50 is connected to the first pure water outlet 402 for storing the filtered water flowing out. The water production device 50 is provided with a first water inlet 501 for introducing pure water. The second reverse osmosis device 60 has a second pure water outlet 601 and a second concentrated salt water outlet 602, the second pure water outlet 601 is connected to the water production device 50 and the washing device 10 through the second three-way valve 61. The second concentrated salt water outlet 602 is connected to the pretreatment device 30 to return the concentrated salt after the filtered water is discharged. The recovery equipment further comprises a first conductivity meter 340, a second conductivity meter 420 and a third conductivity meter 610, the first conductivity meter 340 is used to measure the conductivity of the liquid inlet of the first reverse osmosis device 40, for example, the first conductivity meter 340 can be arranged at the liquid inlet of the first reverse osmosis device 40 or at the connecting water pipe adjacent to the pretreatment device 30. The second conductivity meter 420 is used to measure the conductivity of the filtered water output by the first reverse osmosis device 40, for example, the second conductivity meter 420 can be arranged at the connecting water pipe adjacent to the first pure water outlet 402, and the third conductivity meter 610 is used to measure the conductivity of the filtered water of the second reverse osmosis device 60, for example, the third conductivity meter 610 can be arranged at the second pure water outlet 601 or can be arranged at the water pipe between the second three-way valve 61 and the second pure water outlet 601.

[0075] For example, any of the water washing device 10, the recovery device 20, the pretreatment device 30, the water production device 50 and the management tank 70 can be a tank or a tank body. The first reverse osmosis device 40 and the second reverse osmosis device 60 can have a structure available in the market, and thus the internal structure of the first reverse osmosis device 40 and the second reverse osmosis device 60 is not described herein. The connection between the structures can be achieved by water pipes (the connection lines between the structures shown in the figure are water pipes).

[0076] In some embodiments, the recovery device further comprises a filter 23, for example, the filter 23 can be a security filter. The filter 23 is arranged between the liquid outlet of the recovery device 20 and the liquid inlet of the pretreatment device 30.

[0077] In some embodiments, the water production device 50 is provided with a first cleaning port 502 for feeding cleaning liquid, for example, the number of the first cleaning port 502 can be two, and different first cleaning ports 502 can be used for feeding different kinds of cleaning liquid, for example, one first cleaning port 502 can be used for feeding acid, and the other first cleaning port 502 can be used for feeding alkali. It can be understood that the number of the first cleaning port 502 can also be more or one. The second clean water outlet 601 is connected to the pretreatment device 30 and the second three-way valve 61 of the water production device 50 through the third three-way valve 62, the third three-way valve 62 is connected between the second concentrated salt outlet 602 and the pretreatment device 30, the outlet connected by the third three-way valve 62 and the second three-way valve 61 is connected to the fourth three-way valve 63, one outlet of the fourth three-way valve 63 is connected to the water production device 50, and the other outlet is connected to a waste liquid discharge, for example, the waste liquid discharge can be provided with a waste liquid containing device to load waste liquid. The cooperation of the second three-way valve 61, the third three-way valve 62 and the fourth three-way valve 63 facilitates the discharge of cleaning waste liquid.

[0078] In some embodiments, the pre-treatment device 30 is provided with a second cleaning port 302 for feeding cleaning liquid, and a second water inlet 301 for feeding pure water. The first purified water outlet 402 is connected to the water production device 50 and the first three-way valve 41 via a fifth three-way valve 43. The fifth three-way valve 43 is connected between the first purified water outlet 402 and the water production device 50. The fifth three-way valve 43 and the first three-way valve 41 are connected to a sixth three-way valve 42. One outlet of the sixth three-way valve 42 is connected to the pre-treatment device 30, and the other outlet is connected to a waste liquid discharge. The sixth three-way valve 42 and the fourth three-way valve 63 can be connected to different waste liquid discharges, or can be connected to the same waste liquid discharge. A waste liquid storage device can be provided at the waste liquid discharge to store waste liquid. The first cleaning port 502 and the second cleaning port 302 facilitate cleaning of the reverse osmosis membrane in the reverse osmosis device. The cooperation between different three-way valves facilitates flexible adjustment of the flow direction of liquid.

[0079] It can be understood that the number of second cleaning ports 302 can be one or at least two (two second cleaning ports 302 are shown in the figure, one second cleaning port 302 can be used to feed alkali, and the other second cleaning port 302 can be used to feed acid).

[0080] In some embodiments, the recovery device further comprises a first water inlet valve 51 and a second water inlet valve 31. The first water inlet valve 51 is used to control whether the first water inlet 501 is connected to a water source or not. It can be understood that the first water inlet valve 51 can be installed on the first water inlet 501 or on a water pipe connected to the first water inlet 501. The second water inlet valve 31 is used to control whether the second water inlet 301 is connected to a water source or not. Similarly, the second water inlet valve 31 can be installed on the second water inlet 301 or on a water pipe connected to the second water inlet 301. The water inlet valve is provided to control the water inlet, which is convenient for operation.

[0081] In some embodiments, the recovery device further comprises a first flow meter, a second flow meter, and a third flow meter. The first flow meter is used to measure the flow rate of concentrated salt flowing back into the pre-treatment device 30. The first flow meter, the second flow meter, and the third flow meter can all be Hall flow meters. The first flow meter can be installed on a water pipe for transporting the backflow into the pre-treatment device 30 or on a backflow inlet of the pre-treatment device 30. The second flow meter is used to measure the flow rate of pure water entering the water production device 50. The second flow meter can be installed on the first water inlet 501 or on a water pipe connected to the first water inlet 501. The third flow meter is used to measure the flow rate of the second purified water outlet 601 flowing back to the water washing device 10. The third flow meter can be installed on a backflow water pipe flowing back to the water washing device 10 or on a backflow inlet of the water washing device 10. The flow meter facilitates quantitative maintenance of the liquid input-output balance.

[0082] In some embodiments, the recovery device further comprises a first delivery pump 230, a second delivery pump 34 and a third delivery pump 56. The first delivery pump 230 is disposed between the recovery device 20 and the pretreatment device 30, and is used to pump the liquid into the pretreatment device 30. The second delivery pump 34 is disposed between the pretreatment device 30 and the liquid inlet of the first reverse osmosis device 40, and is used to pump the liquid out of the pretreatment device 30 into the first reverse osmosis device 40. The third delivery pump 56 is disposed between the liquid outlet of the water production device 50 and the liquid inlet of the second reverse osmosis device 60, and is used to pump the liquid out of the water production device 50 into the second reverse osmosis device 60. The delivery pumps are provided to facilitate the liquid flow.

[0083] In some embodiments, the recovery device further comprises a cleaning liquid dosing machine 80, which is used to deliver cleaning liquid to the first cleaning port 502 and the second cleaning port 302. For example, the number of cleaning liquid dosing machines 80 can be two, one of which is an alkaline cleaning liquid dosing machine, and the other of which is an acid cleaning liquid dosing machine.

[0084] The above embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and substitutions made by those skilled in the art based on the present application are within the scope of the present application.

Claims

1. A recycling method, characterized by, The method comprises the following steps: The water rinsing solution produced by rinsing the electroplated parts flows out from the water rinsing device and sequentially flows into the recovery device, the pretreatment device and the first reverse osmosis device; The filtered water produced by filtering through the first reverse osmosis device flows out from the first filtered water outlet and sequentially flows into the water production device and the second reverse osmosis device; The conductivity of the liquid into the first reverse osmosis device is measured by using a first conductivity meter, the conductivity of the filtered water output by the first reverse osmosis device is measured by using a second conductivity meter, whether the concentrated salt output by the first reverse osmosis device reaches the first target conductivity is determined according to the measurement value of the first conductivity meter, and whether the first reverse osmosis device is normally filtered is determined according to the measurement value of the second conductivity meter; The concentrated salt reaching the first target conductivity flows into the management tank from the first concentrated salt outlet of the first reverse osmosis device through the first three-way valve, and then pure water is introduced into the first water inlet of the water production device to maintain the circulating water level, the pure water introduced into the water production device flows into the second reverse osmosis device, the water rinsing device, the recovery device and the pretreatment device, and then returns to the first reverse osmosis device to maintain the water level of the circulating process; The concentrated salt not reaching the first target conductivity returns to the pretreatment device from the first concentrated salt outlet through the first three-way valve, the concentrated salt returning into the pretreatment device continues to be filtered through the first reverse osmosis device, and the concentrated salt circulates between the pretreatment device and the first reverse osmosis device until the conductivity of the concentrated salt reaches the first target conductivity; The conductivity of the filtered water flowing out from the second filtered water outlet of the second reverse osmosis device is measured by using a third conductivity meter, the filtered water reaching the second target conductivity returns to the water rinsing device through the second three-way valve, and then the concentrated salt returns to the pretreatment device from the second concentrated salt outlet of the second reverse osmosis device, and the filtering and returning step of the first reverse osmosis device is repeated; The filtered water not reaching the second target conductivity returns to the water production device, and the filtered water returning into the water production device continues to be filtered through the second reverse osmosis device, and the filtered water circulates between the water production device and the second reverse osmosis device until the conductivity of the filtered water reaches the second target conductivity.

2. The recycling method of claim 1, wherein, Further comprising: A filter is used to filter solid impurities between the outlet of the recovery device and the inlet of the pretreatment device.

3. The recovery method according to claim 1 or 2, characterized by, The second filtered water outlet is connected to the pretreatment device and the second three-way valve through a third three-way valve, the third three-way valve is connected between the second concentrated salt outlet and the pretreatment device, the access ports of the third three-way valve and the second three-way valve are connected to a fourth three-way valve, one outlet of the fourth three-way valve is connected to the water production device, and the other outlet is connected to a waste liquid discharge, and the recovery method further comprises the steps of: A cleaning liquid is introduced from the first cleaning port of the water production device, the cleaning liquid flows into the second reverse osmosis device to clean the permeation membrane, and the trapped cleaning liquid is discharged from the second concentrated salt outlet through the third three-way valve and the fourth three-way valve to the waste liquid discharge; The second reverse osmosis device is cleaned by pure water washing and cleaning solution introduced through the first water inlet. The filtered water after washing is discharged to the waste liquid discharge point through the second clean water outlet and the fourth three-way valve. The intercepted part of the aqueous solution is discharged to the waste liquid discharge point through the third three-way valve and the fourth three-way valve.

4. The recycling method of claim 3, wherein, The first purified water outlet is connected to the water production device and the port of the first three-way valve leading to the pretreatment device via a fifth three-way valve. The fifth three-way valve connects the first purified water outlet and the water production device. The port connecting the fifth three-way valve and the first three-way valve is connected to a sixth three-way valve. One outlet of the sixth three-way valve is connected to the pretreatment device, and the other outlet leads to the waste liquid discharge point. The recycling method further includes: Cleaning liquid is introduced into the second cleaning port of the pretreatment device, and the cleaning liquid flows into the first reverse osmosis device to clean the permeation membrane. The retained cleaning liquid is discharged from the first concentrated salt outlet through the first three-way valve and the sixth three-way valve to the waste liquid discharge point. The first reverse osmosis device is cleaned by pure water washing solution after being introduced into the second inlet of the pretreatment device. The filtered water after washing is discharged to the waste liquid discharge point through the first clean water outlet, the fifth three-way valve and the sixth three-way valve.

5. The recycling method of claim 1, wherein, The number of the first reverse osmosis devices is at least two, and the at least two first reverse osmosis devices are connected in parallel. The liquid flowing out of the pretreatment device is diverted into the at least two first reverse osmosis devices, and the effluent from the at least two first reverse osmosis devices flows into the target device after converging.

6. The recycling method of claim 5, wherein, The number of the second reverse osmosis devices is at least two, and the at least two second reverse osmosis devices are connected in parallel. The liquid flowing out of the water production device is diverted into the at least two second reverse osmosis devices, and the effluent from the at least two second reverse osmosis devices flows into the target device after converging.

7. The recycling method of claim 1, wherein, Also includes: The first flow meter is used to measure the flow rate of concentrated salt flowing back into the pretreatment device, the second flow meter is used to measure the flow rate of pure water entering the water production device, and the third flow meter is used to measure the flow rate of the second purified water outlet flowing back to the washing device. When the measured value of the first flow meter becomes 0, the step of introducing pure water from the first inlet to maintain the circulating water level is performed. Based on the measured value of the second flow meter, the third flow meter is used to adjust the inlet speed of the pure water so that the flow rate returning to the washing device is equivalent to the return value measured by the first flow meter.

8. The recycling method of claim 2, wherein, Also includes: The liquid flowing from the recovery device is pumped into the filter using a first transfer pump. The effluent from the pretreatment unit is pumped into the first reverse osmosis unit using a second transfer pump. The third transfer pump is used to pump the effluent from the product water unit into the second reverse osmosis unit.

9. The recycling method of claim 4, wherein, Also includes: A cleaning fluid dosing machine is used to deliver cleaning fluid to the first cleaning port and the second cleaning port.

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