Electronickelling online high-power concentration recycling system and method

Abstract

The invention discloses an electroplating nickel online high-power concentration recycling system and method, and relates to the field of electroplating wastewater treatment, and the electroplating nickel online high-power concentration recycling system comprises a quartz sand filter, a security filter, a primary reverse osmosis device, a secondary reverse osmosis device, an electrodialysis device and a wastewater treatment station. According to the nickel electroplating online high-power concentration recycling system and method, useful substances in the wastewater can be recycled according to the procedures of reducing the amount of the electroplating wastewater at the source and generating the wastewater in an electroplating production line, and the purposes of recycling the useful substances, reducing the wastewater discharge amount and reducing the pollutant discharge amount are achieved; nickel sulfate or nickel ammonium sulfonate can be highly concentrated; equipment composition is simplified, operation and maintenance are easy, and the automatic control degree is improved; the water quantity of the concentrated solution can be effectively reduced; the device has the advantages that the occupied area is reduced, integration is achieved as much as possible, nickel metal is recycled or reused as much as possible, tap water is saved, the operation cost is saved, and the wastewater discharge amount is reduced.

Description

Technical Field

[0001] The present invention relates to the field of electroplating wastewater treatment, and particularly to an on-line high-fold concentration and reuse system and method for electroplating nickel. Background Art

[0002] Electroplating wastewater has the characteristics of large production volume, heavy pollution, complex treatment process, high treatment cost, and many secondary pollutions. Existing technologies mostly involve simple RO membrane filtration and concentration, or resin adsorption and concentration. When using RO membrane concentration, restricted by the recovery rate of the RO membrane, filtration pressure, and the membrane itself and the membrane system itself, it is impossible to simply highly concentrate the electroplating nickel washing water. Multiple high-pressure RO devices need to be connected in series for concentration, and the highest concentration can only reach 10%.

[0003] When using resin adsorption and concentration, it is applicable to the case of small treated water volume. When the water volume is large, there are problems such as a large amount of resin used and a large floor area. At the same time, the resin itself also has problems such as the need for frequent regeneration, complex regeneration processes, a decrease in adsorption capacity after regeneration, and the resin may become ineffective.

[0004] At the same time, the equipment and processes of existing technologies are complex, the degree of automatic control is poor, and high-concentration concentration cannot be achieved; high-pressure RO equipment is complex, high pressure poses safety hazards, RO membranes are easily blocked, frequent cleaning is required, the equipment occupies a large area, and the concentrated water volume of RO equipment is large; the water volume treated by resin adsorption is small, the resin needs to be regenerated frequently, the regeneration process is complex, the resin is easily ineffective, and the equipment occupies a large area.

[0005] Therefore, it is very necessary to propose an on-line high-fold concentration and reuse system and method for electroplating nickel to solve the above problems. Summary of the Invention

[0006] The main object of the present invention is to provide an on-line high-fold concentration and reuse system and method for electroplating nickel, which can effectively solve the problems in the background art.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] An on-line high-fold concentration and reuse system for electroplating nickel includes a quartz sand filter, a security filter, a first-stage reverse osmosis device, a second-stage reverse osmosis device, an electrodialysis device, and a wastewater treatment station. Lift pumps are installed at both the quartz sand filter and the security filter. The security filter is connected to the first-stage reverse osmosis device through a first high-pressure pump. The first-stage reverse osmosis device is connected to the second-stage reverse osmosis device through a second high-pressure pump. The water produced by the first-stage reverse osmosis device and the second-stage reverse osmosis device is used for reuse in production. The concentrated water produced by the first-stage reverse osmosis device and the second-stage reverse osmosis device is connected to the electrodialysis device through a pipeline. The water produced by the electrodialysis device is connected to the wastewater treatment station through a product water pipeline. The concentrated liquid produced by the electrodialysis device is discharged through a concentrated water pipeline.

[0009] Preferably, a semi-permeable membrane is installed in the electrodialysis device.

[0010] An on-line high-fold concentration and recycling method for electroplating nickel includes the following operating steps:

[0011] S1: The electroplating nickel-containing washing wastewater is discharged into the collection water tank;

[0012] S2: The electroplating nickel-containing water is pressurized by a lift pump and passed through a quartz sand filter and a security filter to remove particulate matters and impurities in the electroplating nickel-containing wastewater;

[0013] S3: The filtered wastewater is pressurized to 2-2.5 Mpa by a first high-pressure pump and a second high-pressure pump and filtered through a primary reverse osmosis device and a secondary reverse osmosis device;

[0014] S4: The heavy metal ion solution intercepted by the primary reverse osmosis device and the secondary reverse osmosis device is discharged as the concentrated water of the membrane, forming a concentrated solution of nickel sulfate and nickel ammonium sulfonate with a concentration of about 1%;

[0015] S5: The concentrated solution enters the electrodialysis device. The electrodialysis device enables the ions in the water to migrate through the membrane under the action of an electric field through the semi-permeable membrane. Through the selective passage of the semi-permeable membrane, a concentrated solution is generated, so that the concentration of nickel sulfate and nickel ammonium sulfonate in the concentrated solution generated by the electrodialysis reaches more than 17%. The produced water is discharged into the wastewater treatment station, and the concentrated solution generated by the electrodialysis is purified, thereby completing the high-fold concentration treatment.

[0016] Preferably, the semi-permeable membrane is an ion exchange membrane.

[0017] Compared with the prior art, the present invention provides an on-line high-fold concentration and recycling system and method for electroplating nickel, having the following beneficial effects:

[0018] 1. The on-line high-fold concentration and recycling system and method for electroplating nickel can reduce the amount of wastewater at the source for electroplating wastewater, recycle useful substances in the wastewater in the process of generating wastewater in the electroplating production line, achieve the purpose of recycling useful substances, reducing the amount of wastewater discharged, and reducing the amount of pollutants discharged, and can highly concentrate nickel sulfate or nickel ammonium sulfonate; and the equipment composition is simplified, easy to operate and maintain, and the degree of automatic control is improved; it can effectively reduce the amount of concentrated solution water; it has the advantages of reducing the floor area, being as integrated as possible, recycling nickel metal or recycling as much as possible, saving the amount of tap water, saving the operation cost, and reducing the amount of wastewater discharged.

[0019] 2. The on-line high-fold concentration and recycling system and method for nickel electroplating can highly concentrate nickel sulfate and nickel sulfamate, with the highest concentration up to 18%. The equipment has a simple composition, is easy to operate and maintain, and has a high degree of automatic control. The amount of water in the concentrated solution is small, and the final concentrated water volume is 40 - 50% less than that of multi-stage RO concentration. The overall floor area is small, it can be highly integrated, and can be installed near the production line or integrated with the production line. The high-fold concentrated solution can be used for nickel metal purification or directly used as the original solution for nickel electroplating, with high economic value. The clean water treated by the system can be directly recycled to the nickel plating water washing process, saving the consumption of tap water and operating costs. The amount of wastewater that can be discharged to the wastewater treatment station is small, reducing the treatment load of the wastewater treatment station.

[0020] 3. The on-line high-fold concentration and recycling system and method for nickel electroplating can intercept most of the ions in the wastewater after two-stage low-pressure RO membrane treatment, with the lowest concentration dropping to 1 PPM. It can be directly returned to the water washing section of the plating production line, effectively reducing the treatment load of the wastewater treatment station, reducing the addition of chemicals, lowering the treatment cost, and ensuring the stable compliance of the discharged metal ions. At the same time, it can also save the usage of tap water, achieving the purpose of cost savings.

[0021] 4. The on-line high-fold concentration and recycling system and method for nickel electroplating use ion exchange membranes in the electrodialysis equipment. Their charge properties can be divided into two types: cation exchange membranes and anion exchange membranes. In an electrolyte aqueous solution, cation exchange membranes allow cations to pass through while repelling and blocking anions, and anion exchange membranes allow anions to pass through while repelling and blocking cations. During the electrodialysis process, the ion exchange membranes do not exchange with a certain ion in the aqueous solution like ion exchange resins, but only play a role in selectively permeating ions with different electrical properties, that is, the ion exchange membranes do not need to be regenerated. At the same time, due to the very high concentration of nickel ions in the concentrated water produced by electrodialysis, it can be used for nickel metal purification or directly used as the original solution for nickel electroplating in the nickel plating production line, thus saving the usage of the original solution for nickel electroplating. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the flowchart of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0024] Example 1:

[0025] An on-line high-fold concentration and reuse system for electroplated nickel, comprising a quartz sand filter, a security filter, a first-stage reverse osmosis device, a second-stage reverse osmosis device, an electrodialysis device, and a wastewater treatment station. Lift pumps are installed at both the quartz sand filter and the security filter. The security filter is connected to the first-stage reverse osmosis device through a first high-pressure pump. The first-stage reverse osmosis device is connected to the second-stage reverse osmosis device through a second high-pressure pump. The water produced by the first-stage reverse osmosis device and the second-stage reverse osmosis device is used for reuse in production. The concentrated water produced by the first-stage reverse osmosis device and the second-stage reverse osmosis device is connected to the electrodialysis device through a pipeline. The water produced by the electrodialysis device is connected to the wastewater treatment station through a water production pipeline. The concentrated liquid produced by the electrodialysis device is discharged through a concentrated water pipeline. A semi-permeable membrane is installed in the electrodialysis equipment.

[0026] Example Two:

[0027] As Figure 1 shown, an on-line high-fold concentration and reuse method for electroplated nickel includes the following operating steps:

[0028] S1: The electroplated nickel-containing washing wastewater is discharged into a collection water tank;

[0029] S2: The electroplated nickel-containing water is pressurized by a lift pump and passed through the quartz sand filter and the security filter to remove the particulate matter and impurities in the electroplated nickel-containing wastewater;

[0030] S3: The filtered wastewater is pressurized to 2 - 2.5 Mpa by the first high-pressure pump and the second high-pressure pump and filtered through the first-stage reverse osmosis device and the second-stage reverse osmosis device;

[0031] S4: The heavy metal ion solution intercepted by the first-stage reverse osmosis device and the second-stage reverse osmosis device is discharged as the concentrated water of the membrane, forming a concentrated solution of nickel sulfate and nickel aminosulfonate with a concentration of about 1%;

[0032] S5: The concentrated solution enters the electrodialysis equipment. The electrodialysis equipment passes through a semi-permeable membrane, and the semi-permeable membrane is an ion exchange membrane, enabling the ions in the water to migrate through the membrane under the action of an electric field. Through the selective passage of the semi-permeable membrane, a concentrated solution is generated, so that the concentration of nickel sulfate and nickel aminosulfonate in the concentrated solution produced by the electrodialysis reaches more than 17%. The produced water is discharged into the wastewater treatment station, and the concentrated solution produced by the electrodialysis is purified, thereby completing the high-fold concentration treatment.

[0033] The method of the present invention is compared with the method of the prior art. The present invention is recorded as an example, and the process of the prior art is recorded as a comparative example. The following is a comparison table:

[0034]

[0035] Thus, it can be seen that the method of the present invention has excellent performance.

[0036] This system can reduce the amount of electroplating wastewater at the source. During the process of generating wastewater in the electroplating production line, it can recycle useful substances in the wastewater, achieving the goals of recycling useful substances, reducing the wastewater discharge volume, and reducing the pollutant discharge volume. It can highly concentrate nickel sulfate or nickel ammonium sulfonate; moreover, the equipment composition is simplified, making it easy to operate and maintain, and improving the degree of automatic control; it can effectively reduce the amount of concentrated liquid water; it has the advantages of reducing the floor area, being as integrated as possible, recycling nickel metal or recycling as much as possible, saving the usage of tap water, saving the operation cost, and reducing the discharged wastewater volume; it can highly concentrate nickel sulfate and nickel ammonium sulfonate, and the concentration can be concentrated up to 18% at most. Also, the equipment composition is simple, easy to operate and maintain, and has a high degree of automatic control; the amount of concentrated liquid water is small, and it is 40 - 50% less than the final concentrated water volume of multi-stage RO concentration; the overall floor area is small, and it can be highly integrated, and can be installed near the production line or integrated with the production line; the highly concentrated liquid can be used for nickel metal purification or directly used as the original solution for nickel electroplating, with high economic value; the clean water treated by the system can be directly recycled to the nickel plating water washing process, saving the usage of tap water and the operation cost; the amount of wastewater that can be discharged to the wastewater treatment station is small, reducing the treatment load of the wastewater treatment station; most of the ions in the wastewater after two-stage low-pressure RO membrane treatment are intercepted, and it can be reduced to a minimum of 1 PPM, and can be directly returned to the water washing section of the plating production line, which can effectively reduce the treatment load of the wastewater treatment station, reduce the chemical agent dosage, lower the treatment cost, and ensure the stable compliance of the discharged metal ions; at the same time, it can also save the usage amount of tap water, achieving the goal of cost savings; through the ion exchange membranes used in the electrodialysis equipment, their charge properties can be divided into two types: cation exchange membranes and anion exchange membranes. In an electrolyte aqueous solution, the cation exchange membrane allows cations to pass through while repelling and blocking anions, and the anion exchange membrane allows anions to pass through while repelling and blocking cations. During the electrodialysis process, the ion exchange membrane does not exchange with a certain ion in the aqueous solution like ion exchange resin, but only plays a role of selectively permeating ions with different electricities, that is, the ion exchange membrane does not need to be regenerated. At the same time, due to the very high concentration of nickel ions in the concentrated water generated by electrodialysis, it can be used for nickel metal purification or directly used as the original solution for nickel electroplating in the nickel plating production line, and based on this, the usage amount of the original solution for nickel electroplating can be saved.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An online high-fold concentration and recycling system for electroplating nickel, comprising a quartz sand filter, a security filter, a primary reverse osmosis device, a secondary reverse osmosis device, an electrodialysis device, and a wastewater treatment station, characterized in that: The quartz sand filter and the security filter are both equipped with lifting pumps. The security filter is connected to the primary reverse osmosis device through a first high-pressure pump, and the primary reverse osmosis device is connected to the secondary reverse osmosis device through a second high-pressure pump. The water produced by the primary reverse osmosis device and the secondary reverse osmosis device is used for reuse production. The concentrated water produced by the primary reverse osmosis device and the secondary reverse osmosis device is connected to the electrodialysis device through a pipeline. The water produced by the electrodialysis device is connected to the wastewater treatment station through a water production pipeline, and the concentrated liquid produced by the electrodialysis device is discharged through a concentrated water pipeline.

2. The on-line high-fold concentration and recycling system for electroplating nickel according to claim 1, characterized in that: The electrodialysis device is equipped with a semi-permeable membrane.

3. A method for online high-fold concentration and reuse of electroplated nickel, using an online high-fold concentration and reuse system for electroplated nickel according to claim 1-2, characterized in that: The steps include: S1: Electroplating nickel-containing washing wastewater is discharged into the collection tank; S2: The nickel-containing electroplating water is pressurized by a booster pump and passed through a quartz sand filter and a security filter to remove particles and impurities in the nickel-containing electroplating wastewater; S3: The filtered wastewater is pressurized to 2-2.5Mpa by the first high-pressure pump and the second high-pressure pump, and filtered through the first-stage reverse osmosis device and the second-stage reverse osmosis device; S4: The heavy metal ion solution intercepted by the primary reverse osmosis device and the secondary reverse osmosis device is discharged as concentrated water of the membrane to form a concentrated solution of nickel sulfate and ammonium nickel sulfonate solution with a concentration of about 1%; S5: The concentrated liquid enters the electrodialysis equipment. The electrodialysis equipment passes through a semi-permeable membrane, so that the ions in the water migrate through the membrane under the action of the electric field and selectively pass through the semi-permeable membrane to produce a concentrated liquid. The concentration of nickel sulfate and ammonium nickel sulfonate in the concentrated liquid produced by the electrodialysis reaches more than 17%. The produced water is discharged into a wastewater treatment station, and the concentrated liquid produced by the electrodialysis is purified to complete the high-fold concentration treatment.

4. A method for online high-fold concentration and recycling of electroplated nickel according to claim 2, characterized in that: The semi-permeable membrane is an ion exchange membrane.

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