CN115974327A - Nickel recovery system and process for nickel plating wastewater - Google Patents

Nickel recovery system and process for nickel plating wastewater Download PDF

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Publication number
CN115974327A
CN115974327A CN202310016543.1A CN202310016543A CN115974327A CN 115974327 A CN115974327 A CN 115974327A CN 202310016543 A CN202310016543 A CN 202310016543A CN 115974327 A CN115974327 A CN 115974327A
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China
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nickel
water
pipe
concentration
membrane
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王永辉
陈志锴
陈枫
黄思齐
雷超
叶平
朱琴
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SHANSHUILE SHENZHEN ENVIRONMENTAL TECHNOLOGIES CO LTD
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SHANSHUILE SHENZHEN ENVIRONMENTAL TECHNOLOGIES CO LTD
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The utility model relates to a nickel recovery system and technology of nickel plating waste water, belong to heavy metal ion electroplating wastewater treatment's technical field, it includes enrichment facility and electrolytic device, enrichment facility includes the collecting pit, multistage membrane system and reverse osmosis system, the collecting pit is arranged in carrying waste water to multistage membrane system, multistage membrane system is arranged in intercepting the nickel ion in the waste water and concentrates step by step, and multistage membrane system output dense water and product water, electrolytic device is used for carrying out the electrolysis with dense water and retrieves nickel metal, reverse osmosis system is used for retrieving product water. This application has the effect that can also effectual reduction use cost when improving nickel ion rate of recovery and recovery efficiency.

Description

Nickel recovery system and process for nickel plating wastewater
Technical Field
The application relates to the technical field of heavy metal ion electroplating wastewater treatment, in particular to a nickel recovery system and process for nickel plating wastewater.
Background
With the development of economy and the advancement of society, energy conservation and resource recycling have become inevitable and socially common. The resource recycling of the waste water is one development direction, and the nickel recovery is a specific implementation of the resource recycling of the metal waste water.
In the field of wastewater treatment, nickel-containing wastewater belongs to high-concentration refractory toxic wastewater. Heavy metals in the wastewater cannot be biodegraded and are enriched in organisms, so that chronic poisoning is caused. The existing method for treating nickel-containing wastewater is to add chemical agents to flocculate and precipitate nickel ions to form nickel-containing sludge. In addition, in order to meet the resource demand of metal wastewater, ion exchange resin methods are gradually appeared in the market. The ion exchange resin is insoluble high molecular spherical granular polymer synthesized by polymerizing styrene or acrylic acid or propylene ester to generate three-dimensional space network structure groups and introducing different types of chemical active groups into the groups. Active functional groups can dissociate ions to exchange with peripheral ions, so that the method can be used for adsorbing and removing heavy metal nickel in wastewater. Therefore, the ion exchange technology can realize the recycling of metal and achieve the dual purposes of wastewater treatment.
However, the ion exchange resin has a limited nickel ion concentration each time due to limited volume, and can be reused after desorption. Although functional groups on ion exchange resins can remove some ions from wastewater, when ion exchange resins are used for a period of time, the efficiency of removing ions is reduced due to the saturation of functional groups, thereby causing the deterioration of water quality. Moreover, the ion exchange resin is also influenced by impurities in the wastewater and is limited by the variety, yield and cost of the exchanger, the requirement on the pretreatment of the wastewater is high, and the regeneration of the ion exchange resin and the treatment of the regenerated liquid are difficult to solve.
In conclusion, the existing technology for treating nickel ion-containing electroplating wastewater has the defects of complex process, difficult control, secondary pollution, low removal rate and the like.
Disclosure of Invention
In order to reduce the use cost of a medicament and improve the recovery rate of metal resources, the application provides a nickel recovery system and a nickel recovery process from nickel plating wastewater.
In a first aspect, the application provides a nickel recovery system for nickel-plating wastewater, which adopts the following technical scheme:
the nickel recovery system comprises a concentration device and an electrolysis device, wherein the concentration device comprises a collecting tank, a multi-stage membrane system and a reverse osmosis system, the collecting tank is used for conveying the wastewater into the multi-stage membrane system, the multi-stage membrane system is used for intercepting and gradually concentrating nickel ions in the wastewater, the multi-stage membrane system outputs concentrated water and produced water, the electrolysis device is used for electrolyzing the concentrated water to recover nickel metal, and the reverse osmosis system is used for recovering the produced water.
By adopting the technical scheme, the nickel ions are concentrated by the concentrating device, the concentrating device can also treat and recycle the produced water in the wastewater, after the wastewater in the application is treated by the concentrating device, 90% -95% of the wastewater can be recycled, the nickel ions can be concentrated while the wastewater is recycled, the membrane adopted in the multi-stage membrane system is used for selectively removing the heavy metal ions in the aqueous solution, and only has the interception effect on the nickel metal ions in the wastewater, by utilizing the characteristic, purified water flows out of one side of the membrane, the nickel ions can be concentrated by the other side of the membrane, and the nickel-containing wastewater is concentrated in high concentration step by step through the membrane permeation, so that the aim of metal wastewater pretreatment is fulfilled; the nickel ions after the concentration treatment can be electrolyzed by an electrolysis device to obtain metallic nickel, thereby realizing the recovery of nickel metal in the wastewater;
compared with the prior art that the chemical agent is nickel ion precipitation or the nickel ions are adsorbed, desorbed and recovered by using ion exchange resin, the method adopts the multistage membrane system in the concentration device to set nickel ion concentration membranes with different grades, and gradually concentrates the nickel ions in the wastewater, so that the method can treat the nickel-containing wastewater with large water volume and high concentration, prolong the continuous operation time of equipment, improve the nickel ion recovery efficiency, effectively reduce the use cost and have good economic value; and this application is through setting up reverse osmosis system for the stable up to standard of product water quality water yield among the enrichment facility, the recycle of the product water of being convenient for.
Optionally, the multistage membrane system includes a primary concentrating component, a secondary concentrating component and a tertiary concentrating component, the primary concentrating component includes a primary tube and a primary membrane filled in the primary tube, the secondary concentrating component includes a secondary tube and a secondary membrane filled in the secondary tube, and the tertiary concentrating component includes a tertiary tube and a tertiary membrane filled in the tertiary tube; the first-stage tube, the second-stage tube and the third-stage tube are arranged in series, and nickel ions in the wastewater are intercepted and concentrated step by step in sequence; and the produced water of the first-stage concentration component enters a reverse osmosis system.
By adopting the technical scheme, the primary tube, the secondary tube and the tertiary tube are arranged in series, and the primary membrane, the secondary membrane and the tertiary membrane which are adopted in the device are all hollow cylindrical structures; the waste water is collected in a collecting tank and then is conveyed into a primary pipe, the waste water in the primary pipe passes through a primary membrane, the primary membrane is used for intercepting and concentrating nickel ions, purified water, namely produced water, is formed in the hollow part of the primary membrane after passing through the primary membrane, the concentrated water produced by the primary membrane can enter a secondary pipe, and the produced water enters a reverse osmosis system for recovery treatment; concentrated water produced by the first-stage membrane enters the diode to be concentrated continuously, so that concentrated water produced by the second-stage membrane enters the triode, and produced water produced by the diode enters the collecting pool; similarly, the three-level membrane in the triode continuously concentrates nickel ions in the concentrated water, the concentration generated by the triode enters an electrolysis device for electrolyzing and recovering nickel metal, and the produced water enters a collection pool for continuous circulating concentration.
Optionally, the produced water of the second-stage concentration component and the third-stage concentration component and the concentrated water produced by the reverse osmosis system are collected in a collection tank for concentration again.
By adopting the technical scheme, as the produced water of the second-level concentration component and the third-level concentration component and the concentrated water produced by the reverse osmosis system are collected in the collecting tank for circular concentration, the economic value of the waste water is developed to the maximum extent, and meanwhile, the recovery rate of the nickel metal is further improved.
Optionally, the number of the first-stage concentration assemblies is several, and each of the first-stage concentration assemblies is arranged in series.
Through adopting above-mentioned technical scheme, when the quantity of first-level concentrated subassembly is a plurality of, can improve the concentrated efficiency to nickel ion to the concentration that makes the concentrated water of concentrated system output in the nickel ion is higher.
Optionally, the electrolysis apparatus includes a rectifier, an electrolysis bath, a transit bath, and an air suction assembly for waste gas treatment, the number of electrolysis baths is several, the transit bath is used for receiving concentrated water produced by the multistage membrane system, and the transit bath is communicated with each electrolysis bath through a liquid inlet pipe; each electrolytic tank is provided with a cathode plate, an anode plate and a heating rod, and the rectifier is electrically connected with the cathode plate and the anode plate.
By adopting the technical scheme, the rectifier mainly plays a role in supplying power to the cathode plate and the anode plate, and because the concentrated water contains high-concentration nickel ions, the concentrated water enters the transfer tank and then enters each electrolytic tank through the liquid inlet pipe, the nickel ions in the nickel-containing concentrated water are always in unordered motion, after the rectifier is electrified with direct current, the ions in the concentrated water make directional motion, the cations move to the cathode, and the electrons are obtained on the cathode plate and are reduced; and anionsMoving to the anode, losing electrons on the anode plate and oxidizing; in the electrolysis of concentrated water containing nickel, SO 4 8315and Cl - Losing electrons at the anode and being oxidized into oxygen and chlorine to be discharged; the nickel ions obtain electrons at the cathode, and are reduced into metal nickel to be separated out on the cathode to form a nickel plate, and the heavy metal nickel ions in the wastewater are finally removed.
Optionally, each electrolytic cell is communicated with the transit trough through a liquid outlet pipe, and is used for collecting electrolyzed concentrated water in the transit trough; and the transfer tank is also used for being communicated with the alkaline barrel.
By adopting the technical scheme, the liquid inlet pipe is used for conveying the nickel-containing concentrated water to the electrolytic tank for electrolysis, and after the concentrated water reaches a certain liquid level, the electrolyzed concentrated water overflows into the liquid outlet pipe and then enters the transfer tank again through the liquid outlet pipe, so that the nickel-containing concentrated water circularly flows in the transfer tank and the electrolytic tank, the nickel ions can be electrolyzed and recovered to the maximum extent, and the recovery rate of the nickel ions is further improved; the transfer tank can effectively circulate the concentrated water, and simultaneously can enable the concentrated water in the electrolytic tank to uniformly flow, and can realize the adjustment of the pH value of the concentrated water.
Optionally, the air suction assembly comprises an air suction pipe and a waste gas tower, the air suction pipe is communicated with the transit tank and each electrolytic tank, and the air suction pipe is also communicated with the waste gas tower so as to be used for removing waste gas and vapor in the electrolytic tank.
Through adopting above-mentioned technical scheme, at nickeliferous dense water electrolysis in-process, the heating rod can heat up the dense water to SO in the dense water 4 8315and Cl - The anode loses electrons and is oxidized into oxygen and chlorine to be discharged, the air suction pipe is used for absorbing waste gas and water vapor generated after concentrated water is heated and then conveying the waste gas and the water vapor to a waste gas tower for waste treatment, and the environment protection is facilitated.
Optionally, an aeration assembly is arranged in the transit tank, the aeration assembly comprises an air pump, an air inlet pipe and a perforated aeration pipe, the perforated aeration pipe is arranged on the bottom wall of the transit tank, and the air inlet pipe is communicated with the perforated aeration pipe.
By adopting the technical scheme, the air pump is started, air is pumped into the perforated aeration pipe through the air inlet pipe, and the perforated aeration pipe is used for stirring the concentrated water in the transfer tank so as to improve the electrolysis effect of the concentrated water.
In a second aspect, the application provides a nickel recovery process for nickel plating wastewater, which adopts the following technical scheme:
a nickel recovery process for nickel plating wastewater comprises the following steps:
(1) And (3) concentrating wastewater: collecting the acidic nickel-containing wastewater in a collecting tank, and sequentially concentrating nickel ions step by step through a first-stage concentration component, a second-stage concentration component and a third-stage concentration component by a multi-stage concentration system to obtain concentrated water and produced water;
(2) And (3) RO membrane filtration: the produced water produced by the first-stage concentration component is recycled by the reverse osmosis system, and the concentrated water produced by the reverse osmosis system is collected in the collecting tank again by the water pipe for multi-stage concentration again;
(3) Water production circulation: the produced water produced by the second-stage concentration component and the third-stage concentration component is collected again in the collecting tank through a water pipe to be concentrated again in multiple stages;
(4) Electrolytic recovery: and (4) feeding the concentrated water produced by the multistage membrane system into an electrolysis device for electrolysis so as to reduce nickel ions to nickel metal on the cathode plate for recovery.
By adopting the technical scheme, the wastewater treatment process adopted by the application carries out step-by-step concentration on nickel ions by arranging the multi-stage concentration membrane, so that the nickel-containing wastewater with large water volume and high concentration can be treated, the nickel ions are concentrated, and meanwhile, a reverse osmosis system can be utilized to recycle produced water, the continuous operation time of equipment is prolonged, and the nickel ion recovery efficiency and the treatment efficiency of the produced water are improved; therefore, the treatment process adopted by the method can effectively reduce the treatment cost, improve the recovery rate and the recovery efficiency of the metallic nickel, simultaneously give consideration to the recovery and utilization of the produced water, and has good economic value.
In summary, the present application includes at least one of the following beneficial technical effects:
1. according to the method, the nickel ion concentration membranes with different grades are arranged in the multi-stage membrane system in the concentration device, and the nickel ions in the wastewater are concentrated step by step, so that the nickel-containing wastewater with large water volume and high concentration can be treated, the continuous operation time of equipment is prolonged, the nickel ion recovery efficiency is improved, the use cost can be effectively reduced, and the method has a good economic value;
2. the method treats the nickel-containing wastewater, the treated nickel-containing wastewater reaches the standard, simultaneously 90% -95% of the wastewater can be recycled, and the concentration system uses the multi-stage membrane to concentrate the nickel-containing wastewater, so that the nickel concentration is at least 30000mg/L, the service life of the recovery system is long, the cost is reduced, and the economic value is improved;
3. the treatment process can effectively reduce the treatment cost, improve the recovery rate and the recovery efficiency of the metal nickel, simultaneously also give consideration to the recovery and the utilization of the produced water, and has good economic value.
Drawings
Fig. 1 is a schematic view of the overall configuration of a concentration device of a recovery system according to an embodiment of the present application.
FIG. 2 is a schematic view of the overall structure of an electrolyzer of the recovery system in the embodiment of the present application.
FIG. 3 is a schematic view of a partial structure of an electrolyzer of a recovery system according to an embodiment of the present application.
Fig. 4 is a schematic structural view of a transit tank of the recovery system of the embodiment of the present application to show an aeration assembly.
FIG. 5 is a flow chart of a nickel recovery process of nickel plating wastewater in an embodiment of the present application.
Description of the reference numerals: 1. a concentration device; 11. a multi-stage membrane system; 111. a first concentration component; 1111. a first-stage pipe; 112. a secondary concentration component; 1121. a diode; 113. a tertiary concentration assembly; 1131. a tertiary pipe; 114. a water inlet pipe; 115. a water outlet pipe; 116. a water production pipe; 117. a sampling head; 2. an electrolysis device; 21. mounting a carrier plate; 22. a rectifier; 221. a copper plate; 23. copper bars; 24. an electrolytic cell; 241. an anode plate; 242. a cathode plate; 243. a heating rod; 25. a transit trough; 251. a liquid inlet pipe; 252. a liquid outlet pipe; 26. a liquid pump; 27. an air suction assembly; 271. an air suction pipe; 272. an off-gas column; 28. an alkaline barrel; 29. an aeration assembly; 291. an air inlet pipe; 292. perforating an aeration pipe; 30. a turning plate type liquid level meter.
Detailed Description
The present application is described in further detail below with reference to the attached drawing figures.
The embodiment of the application discloses nickel recovery system for nickel plating wastewater.
Referring to fig. 1 and 2, the nickel recovery system for nickel plating wastewater comprises a concentration device 1 and an electrolysis device 2, wherein the concentration device 1 comprises a collection tank (not shown in the figure), a multistage membrane system 11 and a reverse osmosis system (not shown in the figure). In the embodiment of the present application, the collecting tank is filled with nickel-containing acidic wastewater to be treated, and the collecting tank is communicated with the multistage membrane system 11 through a water pipe. The multistage membrane system 11 is used for intercepting and concentrating nickel ions step by step so that the concentration of the nickel ions in the concentrated water finally produced by the multistage membrane system 11 reaches 30000mg/L and above, the requirement of pretreatment of a recovery system is met, and the subsequent electrolytic device 2 can conveniently perform homogeneous electrolysis on the concentrated water to recover metal nickel. The produced water of multistage membrane system 11 output can flow into reverse osmosis system, and reverse osmosis system handles the product water, and product water quality and water yield are stable up to standard for 90% ~ 95% waste water can recycle. Consequently, this application sets up the concentrated membrane of nickel ion of different grades through adopting multistage membrane system 11, carries out concentration step by step with the nickel ion in the waste water, can handle the nickeliferous waste water of big water yield, high concentration, and extension equipment continuous operation duration can also effectually reduce use cost when improving nickel ion rate of recovery and recovery efficiency, has fine economic value.
The multistage membrane system 11 includes a first-stage concentration module 111, a second-stage concentration module 112, and a third-stage concentration module 113, and the number of the first-stage concentration modules 111 may be plural, and the number of the first-stage concentration modules 111 employed in the embodiment of the present application is one. The primary concentrating module 111 includes a primary pipe 1111 and a primary membrane (not shown) filled in the primary pipe 1111, and the two primary pipes 1111 are connected in series and connected. The secondary concentration component 112 includes a secondary tube 1121 and a secondary membrane (not shown in the figure) filled in the secondary tube 1121, the tertiary concentration component 113 includes a tertiary tube 1131 and a tertiary membrane (not shown in the figure) filled in the tertiary tube 1131, and the two primary tubes 1111, the secondary tube 1121 and the tertiary tube 1131 are arranged in series. In the embodiment of the present application, the primary tube 1111, the secondary tube 1121, and the tertiary tube 1131 are all cylindrical structures, and the primary membrane, the secondary membrane, and the tertiary membrane are also all hollow cylindrical structures. The number of the primary membranes in each primary tube 1111 is two, and the two primary membranes are connected in series; the number of the secondary membranes is also two, and the two secondary membranes are communicated with each other and are arranged in the diode 1121 in series; the number of the three-stage membranes is also two, and the three-stage membranes are communicated with each other and are arranged in the three-stage pipe 1131 in series. In the embodiment of the application, the adopted primary membrane is a primary concentration membrane, the secondary membrane is a secondary concentration membrane, and the tertiary membrane is a high-pressure concentration membrane.
The primary pipe 1111, the secondary pipe 1121 and the tertiary pipe 1131 are respectively provided with a water inlet pipe 114 and a water outlet pipe 115, the water outlet pipe 115 on the primary pipe 1111 is used for being communicated with the water inlet pipe 114 on the secondary pipe 1121, the water outlet pipe 115 on the secondary pipe 1121 is used for being communicated with the water inlet pipe 114 on the tertiary pipe 1131, and the water outlet pipe 115 of the tertiary pipe 1131 is used for conveying concentrated water to the electrolyzing device 2. One ends of the primary tube 1111, the secondary tube 1121 and the tertiary tube 1131 are respectively provided with a water production pipe 116 through screws, and the water production pipe 116 is respectively communicated with the primary membrane, the secondary membrane and the tertiary membrane. The water outlets of the water inlet pipe 114 and the water outlet pipe 115 on the primary pipe 1111, the secondary pipe 1121 and the tertiary pipe 1131 are all positioned at the outer sides of the primary membrane, the secondary membrane and the tertiary membrane, the acidic nickel-containing wastewater enters the primary pipe 1111 through the water inlet pipe 114, the wastewater is positioned at the outer side of the primary membrane at the moment, the wastewater passes through the primary membrane, and purified water, namely produced water enters the hollow part of the primary membrane through the primary membrane and then flows out through the water producing pipe 116; the nickel ions in the wastewater are trapped and concentrated by the first-stage membrane, and then flow out to a concentration barrel (not shown in the figure) through a water outlet pipe 115. The concentration treatment of the wastewater by the secondary tube 1121 and the tertiary tube 1131 is the same as above, concentrated water produced by the tertiary tube 1131 is collected in a concentration barrel, and then an operator conveys the concentrated water in the concentration barrel to the electrolysis device 2 for recovering the electrolytic nickel metal.
One end of the primary pipe 1111, the secondary pipe 1121 and the tertiary pipe 1131, which is far away from the water production pipe 116, is also provided with a sampling head 117 through a screw, the sampling head 117 is respectively communicated with the primary membrane, the secondary membrane and the tertiary membrane, and an operator can take out filtered water produced through the sampling head 117 for detection. And the produced water from the primary pipe 1111 is sent to the reverse osmosis system through the produced water pipe 116 for treatment and recycling.
In the embodiment of the present application, the water producing pipe 116 on the tertiary pipe 1131 may be communicated with the secondary pipe 1121 through a water pipe, so that the water produced by the tertiary pipe 1131 enters the secondary pipe 1121 for cyclic concentration; and the water production pipe 116 on the secondary tube 1121 can be communicated with the primary tube 1111 through a water pipe, so that the water produced by the secondary tube 1121 enters the primary tube 1111 to be circularly concentrated. In other embodiments, the produced water from the secondary tube 1121 and the tertiary tube 1131 can be collected in a collecting tank through the produced water tube 116 for cyclic concentration.
Reverse osmosis system includes product cask, one-level reverse osmosis membrane, second grade reverse osmosis membrane and retrieval and utilization bucket, and one-level reverse osmosis membrane and second grade reverse osmosis membrane series connection set up, and the one-level reverse osmosis membrane and the second grade reverse osmosis membrane that adopt in this application embodiment are reverse osmosis retrieval and utilization membrane. The product water bucket collects the product water of one-level pipe 1111 output for in carrying product water to one-level reverse osmosis membrane and second grade reverse osmosis membrane, the product water of the processing output of product water process two-stage reverse osmosis membrane enters into the retrieval and utilization bucket, and the dense water of one-level reverse osmosis membrane and second grade reverse osmosis membrane output can be concentrated in the collecting pit through the water piping collection again and carry out the cyclic concentration.
Referring to fig. 2 and 3, the electrolyzer 2 comprises a mounting-support plate 21, a rectifier 22, an electrolytic bath 24, a relay bath 25 and a draft assembly 27 for exhaust gas treatment, and the rectifier 22, the electrolytic bath 24, the relay bath 25 and the draft assembly 27 are all disposed on the mounting-support plate 21. The number of the electrolytic cells 24 can be multiple, and the number of the electrolytic cells 24 used in the embodiment of the present application is two, and two electrolytic cells 24 are arranged on the mounting support plate 21 in parallel. The transfer tank 25 is used for receiving concentrated water in the concentrated solution barrel, the transfer tank 25 is communicated with each electrolytic tank 24 through a liquid inlet pipe 251, a liquid pump 26 is arranged on the mounting support plate 21 through a screw, and the liquid pump 26 is used for pumping the concentrated water in the transfer tank 25 into the two electrolytic tanks 24 through the liquid inlet pipe 251 for electrolysis. The electrolysis device 2 also comprises an alkaline barrel 28, and the alkaline barrel 28 is communicated with the transfer tank 25 through a pipeline, so that the function of adjusting the pH value of the concentrated water can be realized.
The blowing assembly comprises an air suction pipe 271 and a waste gas tower 272, the air suction pipe 271 is integrally formed on the transit tank 25 and the two electrolytic tanks 24, the air suction pipe 271 is communicated with the transit tank 25 and the two electrolytic tanks 24, and the air suction pipe 271 is communicated with the waste gas tower 272. The suction pipe 271 is used for absorbing the exhaust gas and the vapor in the electrolytic cell 24 and conveying the exhaust gas and the vapor to the exhaust gas tower 272 for exhaust gas treatment.
Two rows of copper bars 23 are arranged on the upper edge of the electrolytic cell 24 through screws, and the copper bars 23 are respectively positioned on two sides of the notch. Each electrolytic tank 24 is provided with a plurality of cathode plates 242 and anode plates 241, and two ends of each cathode plate 242 and anode plate 241 are respectively clamped on the copper bar 23. The rectifier 22 transmits current to the copper bar 23 through the copper plate 221, and the positive electrode of the rectifier 22 is electrically connected with the anode plate 241 while the negative electrode is electrically connected with the cathode plate 242. Each electrolytic cell 24 is also provided with a heating rod 243 to heat the concentrated water in the electrolytic cell 24. The two electrolytic tanks 24 are provided with a flap type liquid level meter 30 in a magnetic attraction way, and the flap type liquid level meter 30 controls the automatic operation of the rectifier 22 and the liquid pump 26 by sensing the liquid level in the electrolytic tanks 24.
In the embodiment of the present application, the liquid inlet pipe 251 is located at the bottom of each electrolytic cell 24, the liquid outlet pipe 252 is integrally formed at the position of each electrolytic cell 24 close to the notch, and the liquid outlet pipe 252 is respectively communicated with the transfer tank 25 and the two electrolytic cells 24, so that the electrolyzed concentrated water overflowing from the electrolytic cell 24 enters the transfer tank 25 to continue the circular electrolysis. Emptying pipes (not shown in the figure) are integrally formed on the side walls of the transit tank 25 and the two electrolytic tanks 24, after the nickel ions of the concentrated water in the transit tank 25 and the electrolytic tanks 24 are electrolyzed, the concentrated water is drained through the emptying pipes, and then the concentrated water containing the nickel ions can be added into the transit tank 25 again to continue the circular electrolysis.
Referring to fig. 4, an aeration assembly 29 is further disposed in the transit tank 25, the aeration assembly 29 includes an air pump (not shown), an air inlet pipe 291 and perforated aeration pipes 292, the perforated aeration pipes 292 are disposed on the bottom wall of the transit tank 25 in a rectangular distribution, and the air inlet pipe 291 is communicated with the perforated aeration pipes 292. The air pump is started to pump air into the perforated aeration pipe 292 through the air inlet pipe 291, and the perforated aeration pipe 292 is used for stirring the concentrated water in the transit tank 25 so as to improve the electrolysis effect on the concentrated water.
The embodiment of the application also discloses a nickel recovery process for nickel plating wastewater, which comprises the following steps:
(1) And (3) concentrating wastewater: collecting the acidic nickel-containing wastewater in a collecting tank, and then sequentially passing the acidic nickel-containing wastewater through a first-stage concentration component 111, a second-stage concentration component 112 and a third-stage concentration component 113 to gradually concentrate nickel ions in the wastewater to obtain concentrated water and produced water;
(2) And (3) RO membrane filtration: the produced water produced by the first-stage concentration component 111 is recycled through the reverse osmosis system, and the concentrated water produced by the reverse osmosis system is collected again in the collection pool through a water pipe to be concentrated again in multiple stages;
(3) Water production circulation: the produced water produced by the second-stage concentration component 112 and the third-stage concentration component 113 is collected again in the collecting tank through a water pipe to be concentrated again in multiple stages;
(4) Electrolytic recovery: the concentrated water produced by the multi-stage membrane system 11 is pumped into the electrolytic bath 24 of the electrolytic device 2 for electrolysis, so that nickel ions are reduced to nickel metal on the cathode plate 242 for recovery.
The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (9)

1. A nickel recovery system for nickel plating wastewater is characterized in that: the device comprises a concentration device (1) and an electrolysis device (2), wherein the concentration device (1) comprises a collecting tank, a multi-stage membrane system (11) and a reverse osmosis system, the collecting tank is used for conveying wastewater into the multi-stage membrane system (11), the multi-stage membrane system (11) is used for intercepting nickel ions in the wastewater and concentrating the nickel ions step by step, the multi-stage membrane system (11) outputs concentrated water and produced water, the electrolysis device (2) is used for electrolyzing the concentrated water to recover nickel metal, and the reverse osmosis system is used for recovering the produced water.
2. The nickel recovery system from nickel plating waste water according to claim 1, characterized in that: the multistage membrane system (11) comprises a primary concentrating component (111), a secondary concentrating component (112) and a tertiary concentrating component (113), wherein the primary concentrating component (111) comprises a primary tube (1111) and a primary membrane filled in the primary tube (1111), the secondary concentrating component (112) comprises a secondary tube (1121) and a secondary membrane filled in the secondary tube (1121), and the tertiary concentrating component (113) comprises a tertiary tube (1131) and a tertiary membrane filled in the tertiary tube (1131); the primary tube (1111), the secondary tube (1121) and the tertiary tube (1131) are arranged in series, and nickel ions in the wastewater are intercepted and concentrated step by step in sequence; the produced water of the primary concentration component (111) enters a reverse osmosis system.
3. The system for recovering nickel from nickel plating wastewater according to claim 2, characterized in that: the water produced by the secondary concentration component (112) and the tertiary concentration component (113) and the concentrated water produced by the reverse osmosis system are collected in a collecting tank for concentration again.
4. The nickel recovery system from nickel plating waste water according to claim 2, characterized in that: the number of the primary concentrating assemblies (111) is a plurality, and the primary concentrating assemblies (111) are arranged in series.
5. The nickel recovery system from nickel plating waste water according to claim 1, characterized in that: the electrolysis device (2) comprises a rectifier (22), electrolysis baths (24), a transfer bath (25) and an air suction assembly (27) for waste gas treatment, wherein the number of the electrolysis baths (24) is several, the transfer bath (25) is used for receiving concentrated water produced by a multi-stage membrane system (11), and the transfer bath (25) is communicated with each electrolysis bath (24) through a liquid inlet pipe (251); each of the electrolytic cells (24) has a cathode plate (242), an anode plate (241), and a heating rod (243), and the rectifier (22) is electrically connected to the cathode plate (242) and the anode plate (241).
6. A nickel waste water nickel recovery system of claim 5, characterized in that: each electrolytic cell (24) is communicated with the transit trough (25) through a liquid outlet pipe (252) and is used for collecting electrolyzed concentrated water in the transit trough (25); and the transit trough (25) is also used for being communicated with an alkaline barrel (28).
7. The system for recovering nickel from nickel plating wastewater according to claim 5, characterized in that: the air suction assembly (27) comprises an air suction pipe (271) and an exhaust gas tower (272), the air suction pipe (271) is communicated with the transit tank (25) and each electrolytic tank (24), and the air suction pipe (271) is also communicated with the exhaust gas tower (272) so as to be used for removing the exhaust gas and the steam in the electrolytic tank (24).
8. The system for recovering nickel from nickel plating wastewater according to claim 5, characterized in that: an aeration assembly (29) is arranged in the transit tank (25), the aeration assembly (29) comprises an air pump, an air inlet pipe (291) and a perforated aeration pipe (292), the perforated aeration pipe (292) is arranged on the bottom wall of the transit tank (25), and the air inlet pipe (291) is communicated with the perforated aeration pipe (292).
9. A nickel recovery process from nickel plating waste water according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:
(1) And (3) concentrating wastewater: collecting the acidic nickel-containing wastewater in a collecting tank, and sequentially passing through a first-stage concentration component (111), a second-stage concentration component (112) and a third-stage concentration component (113) to gradually concentrate nickel ions through a multi-stage concentration system to obtain concentrated water and produced water;
(2) And (3) RO membrane filtration: the produced water produced by the first-stage concentration component (111) is recycled through the reverse osmosis system, and the concentrated water produced by the reverse osmosis system is collected in the collection pool again through a water pipe for multi-stage concentration again;
(3) Water production circulation: the produced water produced by the second-stage concentration component (112) and the third-stage concentration component (113) is collected again in the collecting tank through a water pipe for multi-stage concentration again;
(4) Electrolytic recovery: the concentrated water produced by the multi-stage membrane system (11) enters an electrolysis device (2) for electrolysis, so that nickel ions are reduced to nickel metal on a cathode plate (242) for recovery.
CN202310016543.1A 2023-01-06 2023-01-06 Nickel recovery system and process for nickel plating wastewater Pending CN115974327A (en)

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