Electroless nickel plating bath solution resource recovery system

Abstract

The utility model discloses a kind of chemical nickel plating tank liquid resource recovery systems, it is related to waste liquid processing technical field, comprising: solid-liquid separation device, the solid-liquid separation device is used to filter and remove suspended solids and precipitate in chemical nickel plating tank liquid, obtain clear liquid;Ion exchange device, the ion exchange device is used to absorb nickel ion in the clear liquid, and obtain rich nickel desorption liquid by desorption;Evaporation concentration device, the evaporation concentration device is used to carry out evaporation concentration treatment to the ion exchange device production after the liquid;Desorption liquid impurity removal device, the desorption liquid impurity removal device is used to remove the impurity and oil of the rich nickel desorption liquid;Nickel electro-accumulation device, the nickel electro-accumulation device is used to carry out electro-accumulation treatment to the rich nickel desorption liquid after impurity removal.The utility model can efficiently recover nickel in chemical nickel plating tank liquid, and recycle and utilize nitrogen, phosphorus and other resources in chemical nickel plating tank liquid.

Description

Technical Field

[0001] This utility model relates to the field of waste liquid treatment technology, and in particular to a chemical nickel plating bath liquid resource recovery system. Background Technology

[0002] Plating solutions are generally prepared with nickel sulfate, nickel acetate, etc. as the main salts, hypophosphite, sodium borohydride, borane, hydrazine, etc. as reducing agents, and various additives are added. The plating is carried out in an acidic solution at 90°C or a neutral or alkaline solution at near room temperature. Depending on the reducing agent used, plating solutions can be divided into two main categories: electroless nickel-phosphorus plating and electroless nickel-boron plating.

[0003] Electroless nickel plating solutions are disposed of after a period of use; however, their water composition is complex, containing various substances such as complexing agents, hypophosphite, and pH buffers. Among these, the complexing agents in the wastewater combine with nickel ions to form small complex molecules. These complex molecules are relatively stable, making it difficult for nickel ions to precipitate with sodium hydroxide or other heavy metal chelating agents. Therefore, electroless nickel plating is very difficult to handle, and companies typically entrust the disposal of the waste plating solution to third-party hazardous waste treatment companies.

[0004] Therefore, there is an urgent need to provide a chemical nickel plating bath resource recovery system to solve the above-mentioned technical problems existing in the prior art. Utility Model Content

[0005] The purpose of this invention is to provide a chemical nickel plating bath resource recovery system to solve the problems existing in the prior art. It can efficiently recover nickel from the chemical nickel plating bath and also recover and utilize resources such as nitrogen and phosphorus from the chemical nickel plating bath.

[0006] To achieve the above objectives, this utility model provides the following solution: This utility model provides a chemical nickel plating bath solution resource recovery system, including: A solid-liquid separation device is used to filter and remove suspended solids and precipitates from the electroless nickel plating bath to obtain a clear liquid. An ion exchange device is used to adsorb nickel ions in the supernatant and to obtain a nickel-rich desorption solution by desorption. An evaporation and concentration apparatus, wherein the evaporation and concentration apparatus is used to evaporate and concentrate the post-exchange liquid produced by the ion exchange apparatus; A desorption liquid impurity removal device is used to remove impurities and oil from the nickel-rich desorption liquid; A nickel electrowinning apparatus for electrowinning the nickel-rich desorption solution after impurity removal.

[0007] Preferably, the solid-liquid separation device is a bag filter.

[0008] Preferably, the inlet of the solid-liquid separation device is also connected to a raw water tank via an inlet pipe. The raw water tank is used to temporarily store the electroless nickel plating bath solution. The clear liquid outlet of the solid-liquid separation device is also connected to a clear liquid collection tank, which is used to collect the clear liquid.

[0009] Preferably, the ion exchange device includes an ion exchange resin column and a first preparation tank. The ion exchange resin column is connected to the clear liquid collection tank, and the clear liquid in the clear liquid collection tank can be transported to the ion exchange resin column. The ion exchange resin column is filled with resin for recovering nickel ions from the clear liquid. The first preparation tank can hold the desorption solution and is connected to the ion exchange resin column, so that the desorption solution can be transported into the ion exchange resin column to desorb the resin therein.

[0010] Preferably, the evaporation and concentration device includes a neutralization reaction tank, a triple-effect evaporator, and a second preparation tank. The neutralization reaction tank is connected to the ion exchange device and can transport the ion exchange liquid produced by the ion exchange device to the neutralization reaction tank. The second preparation tank can hold alkaline solution, and the second preparation tank is connected to an alkaline solution inlet pipe, which can transport the alkaline solution to the neutralization reaction tank. The neutralization reaction tank is also equipped with a stirring device. The triple-effect evaporator is connected to the neutralization reaction tank, and the adjusted liquid in the neutralization reaction tank can be transported to the triple-effect evaporator for evaporation and concentration; wherein, the triple-effect evaporator is also connected to a steam source, which provides steam to the triple-effect evaporator.

[0011] Preferably, the triple-effect evaporator is also connected to a condensate collection tank and a product collection tank.

[0012] Preferably, the desorption liquid impurity removal device includes an extraction box and an activated carbon adsorption column. The extraction box is connected to the ion exchange device and can transport the nickel-rich desorption liquid into the extraction box. The extraction box is provided with an extractant to extract impurities in the nickel-rich desorption liquid. The activated carbon adsorption column is connected to the extraction box and can remove oil from the nickel-rich desorption liquid.

[0013] Preferably, the nickel electrowinning device includes a nickel electrowinning tank and a liquid alkali absorption tank. The nickel electrowinning tank is connected to the desorption liquid impurity removal device, and the nickel-rich desorption liquid after impurity removal can be introduced into the nickel electrowinning tank. The nickel electrowinning tank is provided with an anode plate and a cathode plate, and both the anode plate and the cathode plate are electrically connected to a DC power supply. Nickel ions in the nickel-rich desorption liquid can be reduced to metallic nickel products at the cathode plate. The top of the nickel electrowinning cell is also equipped with an exhaust fan, which is connected to the liquid alkali absorption tank and can transport the chlorine gas generated during the electrowinning process to the liquid alkali tank, which contains liquid alkali.

[0014] Preferably, the nickel electrodeposition tank is also connected to a transfer tank, and the electrodeposition solution overflowing from the nickel electrodeposition tank can be discharged into the transfer tank.

[0015] Preferably, the transfer tank is also connected to the clear liquid collection tank.

[0016] The present invention achieves the following technical advantages over the prior art: The chemical nickel plating bath resource recovery system of this utility model mainly includes: a solid-liquid separation device, which is used to filter and remove suspended solids and precipitates in the chemical nickel plating bath to obtain a clear liquid; an ion exchange device, which is used to selectively adsorb nickel ions in the clear liquid and obtain a nickel-rich desorption liquid through desorption; an evaporation and concentration device, which is used to evaporate and concentrate the post-exchange liquid produced by the ion exchange device, and after alkaline evaporation and concentration, a product rich in potassium, nitrogen, and phosphorus can be obtained, which can be used as a raw material for agricultural fertilizer and sold externally; a desorption liquid impurity removal device, which is used to remove impurities and oil from the nickel-rich desorption liquid. Specifically, copper, zinc, and other impurities in the nickel-rich desorption liquid can be removed by an extraction process, and then oil in the nickel-rich desorption liquid can be removed by activated carbon adsorption; and a nickel electrodeposition device, which is used to electrodeposit the nickel-rich desorption liquid after impurity removal to obtain a cathode nickel product.

[0017] This invention enables efficient recovery of nickel from electroless nickel plating baths, and also allows for the recycling of resources such as nitrogen and phosphorus from the electroless nickel plating baths. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the chemical nickel plating bath solution resource recovery system in an embodiment of this utility model.

[0020] In the diagram: 1-Raw water tank; 2-Bag filter; 3-Clear liquid collection tank; 4-Resin column; 5-Extraction box; 6-Activated carbon adsorption column; 7-Nickel electrowinning tank; 8-Second preparation tank; 9-First preparation tank; 10-Neutralization reaction tank; 11-Triple-effect evaporator; 12-Condensate collection tank; 13-Product collection tank; 14-Transfer tank; 15-Exhaust fan; 16-Liquid alkali absorption tank. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] The purpose of this invention is to provide a chemical nickel plating bath resource recovery system to solve the problems existing in the prior art. It can efficiently recover nickel from the chemical nickel plating bath and also recover and utilize resources such as nitrogen and phosphorus from the chemical nickel plating bath.

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1 like Figure 1 As shown, this embodiment provides a chemical nickel plating bath solution resource recovery system, which mainly includes: A solid-liquid separation device is used to filter and remove suspended solids and precipitates from the electroless nickel plating bath to obtain a clear liquid. An ion exchange device is used to selectively adsorb nickel ions in the supernatant and obtain a nickel-rich desorption solution by desorption. An evaporation and concentration device is used to evaporate and concentrate the post-exchange liquid produced by the ion exchange device. After alkaline evaporation and concentration, a product rich in potassium, nitrogen, and phosphorus can be obtained, which can be used as a raw material for agricultural fertilizer for export. The desorption liquid impurity removal device is used to remove impurities and oil from the nickel-rich desorption liquid. Specifically, copper, zinc and other impurities in the nickel-rich desorption liquid can be removed by an extraction process, and then oil in the nickel-rich desorption liquid can be removed by activated carbon adsorption. A nickel electrowinning apparatus is used to electrowinically process the nickel-rich desorption solution after impurity removal, thereby obtaining a cathode nickel product.

[0025] This embodiment can efficiently recover nickel from the electroless nickel plating bath and also recover and utilize resources such as nitrogen and phosphorus from the electroless nickel plating bath.

[0026] In this embodiment, the solid-liquid separation device is preferably a bag filter 2, or other filters that meet the solid-liquid separation requirements can be selected, which will not be described in detail in this embodiment.

[0027] Furthermore, the inlet of the solid-liquid separation device is connected to a raw water tank 1 via an inlet pipe. The raw water tank 1 is used to temporarily store the electroless nickel plating bath solution. The clear liquid outlet of the solid-liquid separation device is also connected to a clear liquid collection tank 3, which is used to collect the clear liquid. The inlet pipe is also equipped with a booster pump and a valve. The booster pump is used to provide power for the flow of the electroless nickel plating bath solution, and the valve is used to control the opening and closing of the inlet pipe.

[0028] In this embodiment, the ion exchange device mainly includes an ion exchange resin column 4 and a first preparation tank 9. The ion exchange resin column 4 is connected to the clear liquid collection tank 3 via a clear liquid inlet pipe. The clear liquid inlet pipe is equipped with a booster pump and a valve, which allows the clear liquid in the clear liquid collection tank 3 to be transported to the ion exchange resin column 4. The ion exchange resin column 4 can be made of acrylic or fiberglass and is filled with resin (preferably 930 chelating resin) accounting for 50-70% of its volume for selectively recovering nickel ions from the clear liquid. The first preparation tank 9 can hold desorption solution, which can be 10% hydrochloric acid. The first preparation tank 9 is connected to the ion exchange resin column 4 via a desorption solution inlet pipe, which is equipped with a booster pump and a valve, allowing the desorption solution to be transported to the ion exchange resin column 4 for desorption of the saturated resin.

[0029] In this embodiment, the evaporation and concentration device mainly includes a neutralization reaction tank 10, a triple-effect evaporator 11, and a second preparation tank 8. The neutralization reaction tank 10 is connected to the ion exchange resin column 4 of the ion exchange device through a pipeline, which can transport the post-exchange liquid generated by the ion exchange device to the neutralization reaction tank 10. The second preparation tank 8 can hold an alkaline solution, preferably a 30% potassium hydroxide solution, and the second preparation tank 8 is connected to an alkaline solution inlet pipe. The alkaline solution inlet pipe is equipped with a booster pump and a valve, which can transport the alkaline solution to the neutralization reaction tank 10. The neutralization reaction tank 10 is also equipped with a stirring device, which can stir the alkaline solution and the post-exchange liquid to fully mix and adjust the pH of the post-exchange liquid to 10.5.

[0030] It should be noted that the stirring device can be selected according to specific needs. For example, the stirring device may include a drive motor and a stirring paddle. The output shaft of the drive motor is connected to the stirring paddle, and the drive motor can drive the stirring paddle to rotate to achieve stirring. Alternatively, other stirring devices with different structures can be selected as needed, which will not be described in detail in this embodiment.

[0031] In this embodiment, the triple-effect evaporator 11 is connected to the neutralization reaction tank 10 via a pipeline equipped with a pump and valves. The adjusted liquid in the neutralization reaction tank 10 can be transported to the triple-effect evaporator 11 through the pipeline for evaporation and concentration, controlling the concentration ratio to 25-30 times, to obtain a sol-like product rich in potassium, nitrogen, and phosphorus. The triple-effect evaporator 11 is also connected to a steam source, which provides the required steam to the triple-effect evaporator 11. The steam source can be selected as needed, for example, a steam boiler can be used to provide steam.

[0032] Furthermore, the triple-effect evaporator 11 is also connected to a condensate collection tank 12 and a product collection tank 13, which can transport the generated condensate to the condensate collection tank 12 for periodic discharge; and store the potassium-, nitrogen-, and phosphorus-rich sol-like products in the product collection tank 13 for periodic processing.

[0033] In this embodiment, the desorption liquid impurity removal device mainly includes an extraction tank 5 and an activated carbon adsorption column 6. The extraction tank 5 is connected to the ion exchange resin column 4 of the ion exchange device, and can transport nickel-rich desorption liquid to the extraction tank 5. The extraction tank 5 is provided with an extractant (preferably P507 extractant), which can selectively extract copper and zinc impurities in the desorption liquid, while nickel ions remain in the raffinate. The activated carbon adsorption column 6 is connected to the extraction tank 5 through a pipeline equipped with a pump and valves. The raffinate can be passed into the activated carbon adsorption column 6, which is filled with activated carbon. Through the adsorption and filtration functions of the activated carbon, the oil in the desorption liquid is removed.

[0034] In this embodiment, the nickel electrowinning device mainly includes a nickel electrowinning tank 7 and a liquid alkali absorption tank 16. The nickel electrowinning tank 7 is connected to the activated carbon adsorption column 6 of the desorption liquid impurity removal device. The nickel-rich desorption liquid after impurity removal can be introduced into the nickel electrowinning tank 7. The nickel electrowinning tank 7 is provided with an anode plate and a cathode plate. Both the anode plate and the cathode plate are electrically connected to a DC power supply. Nickel ions in the desorption liquid are reduced to metallic nickel products at the cathode plate. The top of the nickel electrowinning tank 7 is also provided with an exhaust fan 15. The exhaust fan 15 is connected to the liquid alkali absorption tank 16 and can transport the chlorine gas generated during the electrowinning process to the liquid alkali tank. After absorption by the liquid alkali (liquid sodium hydroxide) in the liquid alkali tank, sodium hypochlorite solution can be obtained.

[0035] Furthermore, the nickel electrowinning tank 7 is also connected to a transfer tank 14, and the electrowinning lean solution overflowing from the nickel electrowinning tank 7 can be discharged into the transfer tank 14. The transfer tank 14 is connected to the clear liquid collection tank 3 through a pipeline, which is equipped with a pump and valve to periodically transfer the electrowinning lean solution into the clear liquid collection tank 3.

[0036] The working process of the chemical nickel plating bath solution resource recovery system in this embodiment is as follows: Step 1) Pass the electroless nickel plating bath solution into bag filter 2 for filtration, and discharge the resulting clear liquid into clear liquid collection tank 3; Step 2) By adjusting the frequency of the booster pump, the clear liquid is passed into the ion exchange resin column 4 at a flow rate of 2-4 BV / h, and the resulting post-exchange liquid is discharged to the neutralization reaction tank 10. After the resin in the ion exchange resin column 4 is saturated, it is desorbed by 10% hydrochloric acid in the first preparation tank 9. The amount of dilute hydrochloric acid used is 2-3 BV, the desorption time is 1-1.5h, and the nickel-rich desorbed liquid is discharged to the extraction tank 5. Step 3) After the post-exchange liquid, which accounts for more than 80% of its total volume, is collected in the neutralization reaction tank 10, the stirring device is turned on for stirring. A 30% concentration potassium hydroxide solution is introduced into the second preparation tank 8 to adjust the pH of the post-exchange liquid to 10.5. Then the solution is introduced into the triple-effect evaporator 11 and the concentration ratio is controlled to be 25-30 times to obtain a sol-like product rich in potassium, nitrogen and phosphorus. The product is stored in the product collection tank 13 and processed periodically. The condensate is discharged into the condensate collection tank 12 and discharged periodically. Step 4) The nickel-rich desorption solution is passed into the extraction tank 5. The copper, zinc and other impurity metal ions in the desorption solution are selectively extracted using P507 extractant. The nickel ions remain in the raffinate. The raffinate is then passed into the activated carbon adsorption column 6. The oil in the desorption solution is removed by the adsorption and filtration functions of the activated carbon adsorption column 6. Step 5) After the degreasing and nickel-rich desorption solution is fed into the nickel electrodeposition tank 7 through the inlet at the bottom of the nickel electrodeposition tank 7, turn on the exhaust fan 15 and turn on the matching DC power supply, controlling the current density to 150A / m 2 Simultaneously, the pump flow rate is adjusted (this pump can be the pump between the extraction tank 5 and the activated carbon adsorption column 6, or it can also be installed on the pipeline between the nickel electrowinning tank 7 and the activated carbon adsorption column 6) to ensure that the desorbed solution has a relative residence time of 3-4 hours in the nickel electrowinning tank 7. The overflowing lean electrowinning solution is discharged to the transfer tank 14 and periodically transferred to the clear liquid collection tank 3. The chlorine gas generated during the electrowinning process is drawn by the exhaust fan 15 to the liquid alkali absorption tank 16, where sodium hypochlorite is formed. This portion of sodium hypochlorite can be used for the comprehensive treatment of electroplating wastewater.

[0037] Finally, it should be noted that due to the large fluctuations in the output of electroless nickel plating bath solutions in electroplating enterprises and the unstable supply of raw water to the system, the system does not need to meet the requirements of continuous treatment. In actual treatment, a single-tank reaction treatment mode is often adopted.

[0038] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A chemical nickel plating bath solution resource recovery system, characterized in that: include: A solid-liquid separation device is used to filter and remove suspended solids and precipitates from the electroless nickel plating bath to obtain a clear liquid. An ion exchange device is used to adsorb nickel ions in the supernatant and to obtain a nickel-rich desorption solution by desorption. An evaporation and concentration apparatus, wherein the evaporation and concentration apparatus is used to evaporate and concentrate the post-exchange liquid produced by the ion exchange apparatus; A desorption liquid impurity removal device is used to remove impurities and oil from the nickel-rich desorption liquid; A nickel electrowinning apparatus for electrowinning the nickel-rich desorption solution after impurity removal.

2. The chemical nickel plating bath resource recovery system according to claim 1, characterized in that: The solid-liquid separation device is a bag filter.

3. The chemical nickel plating bath resource recovery system according to claim 1 or 2, characterized in that: The inlet of the solid-liquid separation device is also connected to a raw water tank via an inlet pipe. The raw water tank is used to temporarily store the electroless nickel plating bath solution. The clear liquid outlet of the solid-liquid separation device is also connected to a clear liquid collection tank, which is used to collect the clear liquid.

4. The chemical nickel plating bath resource recovery system according to claim 3, characterized in that: The ion exchange device includes an ion exchange resin column and a first preparation tank. The ion exchange resin column is connected to the clear liquid collection tank, and the clear liquid in the clear liquid collection tank can be transported to the ion exchange resin column. The ion exchange resin column is filled with resin for recovering nickel ions from the clear liquid. The first preparation tank can hold the desorption solution and is connected to the ion exchange resin column, so that the desorption solution can be transported into the ion exchange resin column to desorb the resin therein.

5. The chemical nickel plating bath resource recovery system according to claim 1, characterized in that: The evaporation and concentration device includes a neutralization reaction tank, a triple-effect evaporator, and a second preparation tank. The neutralization reaction tank is connected to the ion exchange device and can transport the exchanged liquid produced by the ion exchange device to the neutralization reaction tank. The second preparation tank is capable of holding alkaline solution, and the second preparation tank is connected to an alkaline solution inlet pipe, which can transport the alkaline solution to the neutralization reaction tank. The neutralization reaction tank is also equipped with a stirring device. The triple-effect evaporator is connected to the neutralization reaction tank, and the adjusted liquid in the neutralization reaction tank can be transported to the triple-effect evaporator for evaporation and concentration; wherein, the triple-effect evaporator is also connected to a steam source, which provides steam to the triple-effect evaporator.

6. The chemical nickel plating bath resource recovery system according to claim 5, characterized in that: The triple-effect evaporator is also connected to a condensate collection tank and a product collection tank.

7. The chemical nickel plating bath resource recovery system according to claim 1, characterized in that: The desorption liquid impurity removal device includes an extraction box and an activated carbon adsorption column. The extraction box is connected to the ion exchange device and can transport nickel-rich desorption liquid into the extraction box. The extraction box is equipped with an extractant to extract impurities in the nickel-rich desorption liquid. The activated carbon adsorption column is connected to the extraction box and can remove oil from the nickel-rich desorption liquid.

8. The chemical nickel plating bath resource recovery system according to claim 3, characterized in that: The nickel electrowinning device includes a nickel electrowinning tank and a liquid alkali absorption tank. The nickel electrowinning tank is connected to the desorption liquid impurity removal device, and the nickel-rich desorption liquid after impurity removal can be introduced into the nickel electrowinning tank. The nickel electrowinning tank is provided with an anode plate and a cathode plate, both of which are electrically connected to a DC power supply. Nickel ions in the nickel-rich desorption liquid can be reduced to metallic nickel products at the cathode plate. The top of the nickel electrowinning cell is also equipped with an exhaust fan, which is connected to the liquid alkali absorption tank and can transport the chlorine gas generated during the electrowinning process to the liquid alkali absorption tank, which contains liquid alkali.

9. The chemical nickel plating bath resource recovery system according to claim 8, characterized in that: The nickel electrodeposition tank is also connected to a transfer tank, and the electrodeposition lean solution overflowing from the nickel electrodeposition tank can be discharged into the transfer tank.

10. The chemical nickel plating bath resource recovery system according to claim 9, characterized in that: The transfer tank is also connected to the clear liquid collection tank.

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