Treatment system for nickel-containing waste liquid

Abstract

The utility model relates to the technical field of waste liquid treatment, and particularly discloses a nickel-containing waste liquid treatment system which comprises a liquid storage tank for loading nickel-containing waste liquid, a sulfuric acid quantifying tank, an ammonia water quantifying tank, an adjusting tank, a filter press, an intermediate tank, an eluent quantifying tank, an ion exchange device, a temporary storage tank, a stirring tank, an ammonium sulfate quantifying tank, a crystallization tank and a centrifugal machine, the liquid storage tank, the sulfuric acid quantifying tank and the ammonia water quantifying tank are all connected with the adjusting tank; the output end of the adjusting tank is connected with the filter press; the output end of the filter press is connected with the intermediate tank; the intermediate tank and the eluent quantifying tank are both connected with the ion exchange device; the output end of the ion exchange device is connected with the temporary storage tank; the temporary storage tank, the sulfuric acid quantifying tank and the ammonium sulfate quantifying tank are all connected with the stirring tank; the output end of the stirring tank, the crystallization tank and the centrifugal machine are sequentially connected, a nickel-ammonium sulfate-containing crystal substance is formed in the crystallization tank, and the centrifugal machine separates out the nickel-ammonium sulfate-containing crystal substance. The device can be used for recovering nickel resources and reducing the pollution of waste liquid to the environment.

Description

Technical Field

[0001] The utility model relates to the technical field of waste liquid treatment, in particular to a treatment system for nickel-containing waste liquid. Background Art

[0002] Nickel, with its excellent wear resistance, corrosion resistance, and weldability, is widely used in electroplating and other fields. Nickel-containing wastewater primarily comes from plating tank wastewater and rinse water during the nickel plating process. Discharging untreated nickel-containing wastewater not only harms the environment and human health, but also wastes precious metal resources. Therefore, it is necessary to develop a treatment system for nickel-containing wastewater to recover nickel resources and reduce environmental pollution. Utility Model Content

[0003] The utility model provides a treatment system for nickel-containing waste liquid, which can recycle nickel resources and reduce the pollution of the waste liquid to the environment.

[0004] In order to solve the above problems, the present invention adopts the following technical solutions:

[0005] The embodiment of the utility model provides a treatment system for nickel-containing waste liquid, comprising a liquid storage tank for loading nickel-containing waste liquid, a sulfuric acid quantitative tank, an ammonia quantitative tank, a regulating tank, a filter press, an intermediate tank, an eluent quantitative tank, an ion exchange device, a temporary storage tank, a stirring tank, an ammonium sulfate quantitative tank, a crystallization tank and a centrifuge; the liquid storage tank, the sulfuric acid quantitative tank and the ammonia quantitative tank are all connected to the regulating tank to mix the nickel-containing waste liquid, sulfuric acid and ammonia; the output end of the regulating tank is connected to the filter press, and the filter press is used to filter out sludge; the output end of the filter press is connected to the intermediate tank, The intermediate tank and the eluent metering tank are both connected to an ion exchange device, which is used to perform ion exchange; the output end of the ion exchange device is connected to a temporary storage tank to transport the eluted eluent to the temporary storage tank; the temporary storage tank, the sulfuric acid metering tank and the ammonium sulfate metering tank are all connected to a stirring tank, which is used to mix the solution, sulfuric acid and ammonium sulfate in the temporary storage tank; the output end of the stirring tank, the crystallization tank and the centrifuge are connected in sequence, the crystallization tank is used to form nickel-ammonium sulfate crystals, and the centrifuge is used to separate the nickel-ammonium sulfate crystals.

[0006] In some embodiments, it also includes an evaporator, a condensed wastewater tank and a concentration tank. The ion exchange device is connected to the evaporator to transport the waste liquid after ion exchange to the evaporator. The evaporator is used to concentrate and evaporate the waste liquid after ion exchange; the evaporator is connected to the concentration tank to transport the evaporated concentrated liquid to the concentration tank; the evaporator is connected to the condensed wastewater tank to transport the condensed water generated by evaporation to the condensed wastewater tank.

[0007] In some embodiments, a desalination tank is further included. The ion exchange device, the desalination tank and the regulating tank are connected in sequence. The desalination tank is used to receive the waste liquid generated by the ion exchange resin after washing and eluting with pure water and transport the waste liquid to the regulating tank.

[0008] In some embodiments, an intermediate transition tank is further included. The centrifuge, the intermediate transition tank and the regulating tank are connected in sequence. The intermediate transition tank is used to receive the waste liquid separated by the centrifuge and transport the waste liquid to the regulating tank.

[0009] In some embodiments, a first collecting tank is further included, which is connected to the regulating tank to collect sulfuric acid mist and ammonia gas in the regulating tank.

[0010] In some embodiments, a second collecting tank is further included, wherein the second collecting tank is connected to the stirring tank to collect sulfuric acid mist in the stirring tank.

[0011] The utility model has at least the following beneficial effects: the utility model performs a mixed reaction on nickel-containing waste liquid, sulfuric acid and ammonia water, and then transports the reaction mixture to a filter press for filtration, inputs the filtered solution into an ion exchange device, the ion exchange device performs ion exchange on the solution, and then elutes with an eluent, and the eluted solution, a sulfuric acid quantitative tank and an ammonium sulfate quantitative tank are mixed and reacted in a stirring tank, a crystallization tank forms nickel-ammonium sulfate crystals, and a centrifuge is used to separate the nickel-ammonium sulfate crystals, thereby recovering nickel resources in the nickel-containing waste liquid and reducing the pollution of the waste liquid to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural schematic diagram of a system for treating nickel-containing waste liquid according to an embodiment of the present invention.

[0013] Wherein, the accompanying drawings are marked as follows:

[0014] Liquid storage tank 11, sulfuric acid metering tank 12, ammonia water metering tank 13, regulating tank 14, filter press 15, intermediate tank 16, eluent metering tank 17, ion exchange device 18, temporary storage tank 19, stirring tank 20, ammonium sulfate metering tank 21, crystallization tank 22, centrifuge 23. DETAILED DESCRIPTION

[0015] The following description of the present invention, with reference to the accompanying drawings, is provided to facilitate a more comprehensive understanding of the various embodiments of the present invention as defined in the claims and their equivalents. The description includes various specific details to assist understanding, but these details should be construed as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present invention.

[0016] In the description of the present invention, descriptions of directions, such as up, down, front, back, left, right, etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0017] It will be understood that when one element (e.g., a first element) is “connected” to another element (e.g., a second element), the element may be directly connected to the other element or an intervening element (e.g., a third element) may be present between the element and the other element.

[0018] The embodiment of the present invention provides a system for treating nickel-containing waste liquid, such as Figure 1 As shown, the system comprises a liquid storage tank 11, a sulfuric acid quantitative tank 12, an ammoniacal liquor quantitative tank 13, an adjusting tank 14, a filter press 15, an intermediate tank 16, an eluent quantitative tank 17, an ion exchange unit 18, a temporary storage tank 19, a stirring tank 20, an ammonium sulfate quantitative tank 21, a crystallization tank 22 and a centrifuge 23 for loading nickel-containing waste liquid. The sulfuric acid quantitative tank 12 is loaded with sulfuric acid and is used for quantitatively outputting sulfuric acid, and the ammoniacal liquor quantitative tank 13 is loaded with ammoniacal liquor and is used for quantitatively outputting ammoniacal liquor. The liquid storage tank 11, the sulfuric acid quantitative tank 12 and the ammoniacal liquor quantitative tank 13 are all connected to the adjusting tank 14 to mix the nickel-containing waste liquid, sulfuric acid and ammoniacal liquor, and then to adjust the pH value of the solution, preferably the pH value of the solution is controlled within the range of 5.5-6.0. The output end of the adjusting tank 14 is connected to the filter press 15, which is used to filter out the sludge generated by the reaction, and the sludge is processed by hazardous waste transfer. The output of filter press 15 is connected to intermediate tank 16, where the filtrate is transferred for storage. Both intermediate tank 16 and eluent metering tank 17 are connected to ion exchange unit 18, which contains ion exchange resin, which absorbs ions from the solution through ion exchange. Eluent metering tank 17 holds and quantitatively outputs eluent, which can be a sulfuric acid solution. After the ion exchange is complete, the ion exchange resin is eluted with the sulfuric acid solution to produce a nickel sulfate solution. The output of ion exchange unit 18 is connected to temporary storage tank 19, where the eluted eluent is also transferred. The temporary storage tank 19, the sulfuric acid metering tank 12 and the ammonium sulfate metering tank 21 are all connected to the stirring tank 20, which is used to mix the solution, sulfuric acid and ammonium sulfate in the temporary storage tank 19; the output end of the stirring tank 20, the crystallization tank 22 and the centrifuge 23 are connected in sequence, the crystallization tank 22 is used to form nickel-ammonium sulfate crystals, and the centrifuge 23 is used to separate the nickel-ammonium sulfate crystals to prepare nickel-ammonium sulfate. In this way, the nickel resources in the nickel-containing waste liquid can be recovered for reuse, and the pollution of the waste liquid to the environment is reduced, which is more environmentally friendly.

[0019] In some embodiments, the treatment system for nickel-containing waste liquid further includes an evaporator, a condensed wastewater tank, and a concentration tank. After ion exchange, the ion exchange resin absorbs ions in the solution, producing deionized waste liquid. The tank ion exchange device 18 is connected to the evaporator to transport the ion-exchanged waste liquid to the evaporator. The evaporator is used to concentrate and evaporate the ion-exchanged waste liquid. The evaporator is connected to the concentration tank to transport the evaporated concentrated liquid to the concentration tank, so that the concentrated liquid is stored in the concentration tank and later treated as hazardous waste. The evaporator is also connected to the condensed wastewater tank to transport the condensed water produced by evaporation to the condensed wastewater tank. The condensed wastewater can be sent to the comprehensive treatment area for treatment in the later stage and reused in production after meeting the standards.

[0020] This embodiment treats the waste liquid after ion exchange to avoid pollution to the environment, and collects the condensed waste water for secondary utilization, thereby improving resource utilization.

[0021] In some embodiments, the treatment system for nickel-containing waste liquid also includes a dilute washing tank, an ion exchange device 18, a dilute washing tank and a regulating tank 14 connected in sequence, and the eluted ion exchange resin needs to be rinsed with pure water until it is neutral before it can be used. The dilute washing tank is used to receive the waste liquid generated by the eluted ion exchange resin after the pure water rinse and transport the waste liquid to the regulating tank 14 so that the eluted ions can continue to enter the system, thereby improving the recovery rate of nickel resources.

[0022] In some embodiments, the treatment system for nickel-containing waste liquid also includes an intermediate transition tank, and the centrifuge 23, the intermediate transition tank and the regulating tank 14 are connected in sequence. The centrifuge 23 will separate the waste liquid. The intermediate transition tank is used to receive the waste liquid separated by centrifuge 23 and transport the waste liquid to the regulating tank 14 so that the nickel resources remaining in the waste liquid can re-enter the system, thereby improving the recovery rate of nickel resources.

[0023] In some embodiments, the nickel-containing waste liquid treatment system also includes a first collecting tank, which is connected to the regulating tank 14. Both sulfuric acid and ammonia are volatile. The first collecting tank is used to collect sulfuric acid mist and ammonia in the regulating tank 14 to prevent sulfuric acid mist and ammonia from being directly discharged into the atmosphere, thereby reducing pollution to the environment.

[0024] In some embodiments, the nickel-containing waste liquid treatment system further includes a second collecting tank connected to the stirring tank 20 for collecting sulfuric acid mist in the stirring tank 20 to prevent the sulfuric acid mist from being directly discharged into the atmosphere, thereby reducing pollution to the environment.

[0025] The terms and words used in the above description and claims are not limited to their literal meanings, but are merely used by the applicant to enable a clear and consistent understanding of the present invention. Therefore, it should be clear to those skilled in the art that the above description of various embodiments of the present invention is provided for illustration only and is not intended to limit the present invention as defined in the appended claims and their equivalents.

Claims

1. A system for treating nickel-containing waste liquid, characterized in that: The invention comprises a liquid storage tank for loading nickel-containing waste liquid, a sulfuric acid quantitative tank, an ammonia quantitative tank, a regulating tank, a filter press, an intermediate tank, an eluent quantitative tank, an ion exchange device, a temporary storage tank, a stirring tank, an ammonium sulfate quantitative tank, a crystallization tank and a centrifuge; the liquid storage tank, the sulfuric acid quantitative tank and the ammonia quantitative tank are all connected to the regulating tank to mix the nickel-containing waste liquid, sulfuric acid and ammonia; the output end of the regulating tank is connected to the filter press, and the filter press is used to filter out sludge; the output end of the filter press is connected to the intermediate tank, and the intermediate tank and the eluent quantitative tank are all connected. It is connected to an ion exchange device, which is used to perform ion exchange; the output end of the ion exchange device is connected to a temporary storage tank to transport the eluted eluate to the temporary storage tank; the temporary storage tank, the sulfuric acid metering tank and the ammonium sulfate metering tank are all connected to a stirring tank, which is used to mix the solution, sulfuric acid and ammonium sulfate in the temporary storage tank; the output end of the stirring tank, a crystallization tank and a centrifuge are connected in sequence, the crystallization tank is used to form nickel-ammonium sulfate crystals, and the centrifuge is used to separate the nickel-ammonium sulfate crystals.

2. The nickel-containing waste liquid treatment system according to claim 1, wherein: It also includes an evaporator, a condensed wastewater tank and a concentration tank. The ion exchange device is connected to the evaporator to transport the waste liquid after ion exchange to the evaporator. The evaporator is used to concentrate and evaporate the waste liquid after ion exchange; the evaporator is connected to the concentration tank to transport the evaporated concentrated liquid to the concentration tank; the evaporator is connected to the condensed wastewater tank to transport the condensed water generated by evaporation to the condensed wastewater tank.

3. The nickel-containing waste liquid treatment system according to claim 1, wherein: It also includes a dilute washing tank. The ion exchange device, the dilute washing tank and the regulating tank are connected in sequence. The dilute washing tank is used to receive the waste liquid generated by the ion exchange resin after washing and eluting with pure water and transport the waste liquid to the regulating tank.

4. The nickel-containing waste liquid treatment system according to claim 1, wherein: It also includes an intermediate transition tank. The centrifuge, the intermediate transition tank and the regulating tank are connected in sequence. The intermediate transition tank is used to receive the waste liquid separated by the centrifuge and transport the waste liquid to the regulating tank.

5. The nickel-containing waste liquid treatment system according to claim 1, wherein: The system also includes a first collecting tank, which is connected to the regulating tank and is used to collect sulfuric acid mist and ammonia gas in the regulating tank.

6. The nickel-containing waste liquid treatment system according to claim 1, wherein: The invention also comprises a second collecting tank, which is connected to the stirring tank and is used for collecting sulfuric acid mist in the stirring tank.

Images