CN210683962U - Nitric acid deplating liquid recycling system - Google Patents
Nitric acid deplating liquid recycling system Download PDFInfo
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- CN210683962U CN210683962U CN201921432922.4U CN201921432922U CN210683962U CN 210683962 U CN210683962 U CN 210683962U CN 201921432922 U CN201921432922 U CN 201921432922U CN 210683962 U CN210683962 U CN 210683962U
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The utility model provides a nitric acid stripping solution recycling system and a method, which comprises a stripping aqueduct; a deplating liquid storage tank; a concentrated sulfuric acid storage tank; a freezing and crystallizing device; a first solid-liquid separation device; a distillation apparatus; a condenser; a distillate storage tank; a dissolving tank; a first electrolysis device; a displacement device; a second solid-liquid separation device; a second electrolysis device. The utility model discloses in, at first through adding concentrated sulfuric acid in moving back the plating bath, make nitrate wherein turn into the sulfate, then the cooling makes the sulfate separate out, realize solid-liquid separation, solution after the separation is through distillation and cooling, obtain pure nitric acid solution, the crystal that solid-liquid separation obtained is dissolved and is carried out the electrolysis, make simple substance copper separate out, the impurity metal ion in solution is gone out to the rethread nickel replacement method, then carry out the secondary electrolysis, obtain simple substance nickel, thereby nitric acid in having realized moving back the plating bath, the recycle of copper and nickel, the innocent treatment to moving back the plating bath has been realized.
Description
Technical Field
The invention relates to the technical field of nitric acid deplating liquid circulating equipment, in particular to a nitric acid deplating liquid recycling system.
Background
The nitric acid stripping solution mainly exists in PCB and electroplating industries, and is a stripping waste liquid generated by dissolving a plating layer on an electroplating hanger by nitric acid and dissolving a plating layer on an electroplated defective product by nitric acid.
The electroplating rack is a hanging tool and a conductive tool for electroplating, metal coatings such as copper, nickel and the like are deposited in the process of immersing various electroplating solutions and chemical plating solutions, and when the thicknesses reach a certain value, deplating is needed. When a poor plating layer is generated, the plated piece is scrapped, and the plating layer on the poor plated piece is usually stripped, namely deplating, and then returning to the secondary processing. The electroplating hanger and the base material are also mainly made of iron, stainless steel and aluminum materials, a copper layer and a nickel layer on the surface of the hanger or a poor plated part can be stripped at one time by using nitric acid, and the hanger or the base material cannot be damaged due to passivation of the nitric acid on the surface of the iron, stainless steel and aluminum materials, so that the nitric acid is widely used for deplating at present. When the nitric acid stripping solution is used for a period of time, the concentrations of copper nitrate and nickel nitrate are gradually increased, so that the dissolving speeds of copper and nickel in nitric acid are inhibited, and when the speeds cannot meet the production requirement, the fresh nitric acid stripping solution is replaced. The deplating waste liquid generated in the deplating process contains a large amount of heavy metals (copper and nickel) and total nitrogen (nitrate radical), and if the deplating waste liquid is not properly treated, the ecological environment can be seriously damaged.
At present, the treatment method of nitric acid deplating waste liquor mainly comprises an acid-base neutralization precipitation method and an electrolysis method. The acid-base neutralization precipitation method can only remove heavy metals in the waste liquid, and has the defects that the generated waste water contains high-concentration nitrate ions and cannot be removed, and the total nitrogen still exceeds the standard. The electrolytic method can separate out copper in the deplating waste liquid on the surface of the cathode plate of the electrolytic bath and recover the copper plate. The method has the disadvantages that nickel and other impurity metals in the waste liquid can not be electrolytically separated out under the acid separation condition, the nickel stripping effect is poor when the electrolyzed nitric acid stripping liquid is recycled, the recycling rate is not high, and the recycling significance is not great.
SUMMERY OF THE UTILITY MODEL
According to the not enough of prior art more than, the utility model provides a useless nitric acid is handled and is used vacuum distillation equipment can realize recycling the copper in the deplating liquid, nickel and nitric acid.
The utility model provides a its technical problem adopt following technical scheme to realize:
a nitric acid deplating liquid recycling system comprises
A transition groove is withdrawn;
the deplating liquid storage tank is used for receiving the deplating liquid output by the deplating groove;
the concentrated sulfuric acid storage tank is used for providing a preset amount of concentrated sulfuric acid into the deplating solution storage tank so as to convert nitrate in the deplating solution into sulfate and free nitric acid;
the freezing and crystallizing device is used for cooling the deplating liquid added with the concentrated sulfuric acid so as to separate out sulfate crystals;
the first solid-liquid separation device is used for separating sulfate crystals from free nitric acid to obtain sulfate crystals and a nitric acid solution;
the distillation device is used for distilling the nitric acid solution obtained by the first solid-liquid separation device;
the inlet of the condenser is connected to the outlet of the distillation device and is used for collecting nitric acid steam output by the distillation device;
the distillate storage tank is used for collecting the distillate output by the condenser;
the dissolving tank is used for dissolving the sulfate crystals obtained by the first solid-liquid separation device to obtain a sulfate solution;
the first electrolysis device is used for electrolyzing copper sulfate in the sulfate solution output by the dissolving tank;
the replacement device is used for adding solid nickel into the solution output by the first electrolysis device to replace impurity metal ions in the solution and obtain a nickel sulfate solution and impurity solid metal;
the second solid-liquid separation device is used for separating the nickel sulfate solution from impurity solid metal;
and the second electrolysis device is used for electrolyzing the nickel sulfate solution.
As an optional implementation manner, the system further comprises a concentration adjusting device and a concentrated nitric acid storage tank, wherein the concentration adjusting device is used for adjusting the nitric acid distillate stored in the distillate storage tank and the concentrated nitric acid output by the concentrated nitric acid storage tank according to a preset proportion, and inputting the nitric acid distillate and the concentrated nitric acid into the annealing tank.
As an optional embodiment, the distillation device is further configured to output the distilled concentrated solution to the freezing and crystallizing device.
As an optional implementation manner, the system further comprises a regenerated sulfuric acid storage tank, wherein the regenerated sulfuric acid storage tank is used for storing the solution output by the first electrolysis device, and the regenerated sulfuric acid storage tank is further used for mixing the solution with the concentrated sulfuric acid in the concentrated sulfuric acid storage tank according to a preset proportion and outputting the mixed solution to the deplating solution storage tank.
As an alternative embodiment, the solid nickel is nickel powder.
The utility model has the advantages that:
the utility model discloses in, at first through adding concentrated sulfuric acid in moving back the plating bath, make nitrate wherein turn into the sulfate, then the cooling makes the sulfate separate out, realize solid-liquid separation, solution after the separation is through distillation and cooling, obtain pure nitric acid solution, the crystal that solid-liquid separation obtained is dissolved and is carried out the electrolysis, make simple substance copper separate out, the impurity metal ion in solution is gone out to the rethread nickel replacement method, then carry out the secondary electrolysis, obtain simple substance nickel, thereby nitric acid in having realized moving back the plating bath, the recycle of copper and nickel, the innocent treatment to moving back the plating bath has been realized.
Drawings
The present invention will be further explained with reference to the drawings and examples.
FIG. 1 is a front view of the system of the present embodiment;
FIG. 2 is a flow chart of a method of the present embodiment.
In the figure, 1-a transition tank, 2-a deplating liquid storage tank, 3-a concentrated sulfuric acid storage tank, 4-a freezing and crystallizing device, 5-a first solid-liquid separation device, 6-a distillation device, 7-a condenser, 8-a distillate storage tank, 9-a dissolving tank, 10-a first electrolysis device, 11-a replacement device, 12-a second solid-liquid separation device, 13-a second electrolysis device, 14-a concentration preparation device, 15-a concentrated nitric acid storage tank and 16-a regenerated sulfuric acid storage tank.
Detailed Description
In the following description of the embodiments, the detailed description of the embodiments of the present invention, such as the shapes and structures of the components, the mutual positions and connection relationships between the components, the functions and working principles of the components, the manufacturing processes, and the operation and use methods, will be further described in detail to help those skilled in the art to understand the concept and technical solutions of the present invention more completely, accurately and deeply.
As a first aspect of the present invention, as shown in FIG. 1, there is provided a nitric acid deplating solution recycling system comprising
A retreat aqueduct 1;
the deplating liquid storage tank 2 is used for receiving the deplating liquid output by the deplating tank 1;
the concentrated sulfuric acid storage tank 3 is used for providing a preset amount of concentrated sulfuric acid into the deplating solution storage tank 2 so as to convert nitrate in the deplating solution into sulfate and free nitric acid;
the freezing and crystallizing device 4 is used for cooling the deplating liquid added with the concentrated sulfuric acid so as to separate out sulfate crystals;
a first solid-liquid separation device 5 for separating sulfate crystals from free nitric acid to obtain sulfate crystals and a nitric acid solution;
a distillation device 6 for distilling the nitric acid solution obtained by the first solid-liquid separation device 5;
a condenser 7, wherein the inlet of the condenser 7 is connected to the outlet of the distillation device 6 and is used for collecting nitric acid steam output by the distillation device 6;
a distillate storage tank 8 for collecting the distillate output by the condenser 7;
a dissolving tank 9 for containing dilute sulfuric acid electrolyte for dissolving the sulfate crystals obtained by the first solid-liquid separation device 5 to obtain a sulfate solution;
a first electrolysis device 10 for electrolyzing copper sulfate in the sulfate solution output from the dissolution tank 9;
a replacement device 11, configured to add solid nickel to the solution output by the first electrolysis device 10 to replace impurity metal ions, such as copper ions, in the solution, and obtain a nickel sulfate solution and impurity solid metal;
a second solid-liquid separation device 12 for separating the nickel sulfate solution from the impurity solid metal;
and a second electrolysis device 13 for electrolyzing the nickel sulfate solution.
The utility model discloses in, at first through concentrated sulfuric acid storage tank 3's setting, make it can be to the concentrated sulfuric acid of output (also can be the sulphuric acid that has preset concentration after diluting) in the deplating liquid storage tank 2, will move back the nitrate in the plating bath (mainly be copper nitrate and nickel nitrate) and turn into sulfate and free nitric acid, then through freezing crystallization device 4's setting, adopt the freezing solubility that reduces the sulfate of the frozen mode of cooling, make it appear, cooperate first solid-liquid separation equipment 5 again, salt out sulfuric acid. The nitric acid solution after the sulfate precipitation is used by matching a distillation device 6 and a condenser 7, distillation purification is carried out, the obtained distillate (namely, pure nitric acid solution) is stored in a distillate storage tank 8, so that the recovery of nitric acid is realized, in addition, dilute sulfuric acid electrolyte is used for dissolving sulfate crystals output by a first solid-liquid separation device 5 to obtain a sulfate solution, and the dissolved sulfate solution is electrolyzed by a first electrolysis device 10 to obtain elemental copper and a sulfuric acid solution; after the concentration of nickel ions in the sulfuric acid solution reaches a preset concentration (close to saturation), the sulfuric acid solution is placed in a replacement device 11, metal nickel is added into the replacement device, impurity metal ions in the sulfuric acid solution are removed by a replacement method, the sulfuric acid solution only containing the nickel ions and impurity solid metal are obtained, the impurity solid metal is removed by using a second solid-liquid separation device 12, and then the sulfuric acid solution with the impurity metal ions removed is placed in a second electrolysis device 13 for electrolysis, so that elemental nickel is obtained. The utility model discloses in, at first through adding concentrated sulfuric acid in moving back the plating bath, make nitrate wherein turn into the sulfate, then the cooling makes the sulfate separate out, realize solid-liquid separation, solution after the separation is through distillation and cooling, obtain pure nitric acid solution, the crystal that solid-liquid separation obtained is dissolved and is carried out the electrolysis, make simple substance copper separate out, the impurity metal ion in solution is gone out to the rethread nickel replacement method, then carry out the secondary electrolysis, obtain simple substance nickel, thereby nitric acid in having realized moving back the plating bath, the recycle of copper and nickel, the innocent treatment to moving back the plating bath has been realized.
The freezing crystallization device 4 is used for cooling and freezing a nitric acid solution containing sulfate to achieve the purpose of phase separation of nitric acid and sulfate such as copper ions, nickel ions and the like, the solubility of copper sulfate and nickel sulfate is greatly reduced under the condition of low temperature, and crystal precipitation is formed when supersaturation is achieved; the solubility of copper nitrate and nickel nitrate is far higher than that of copper sulfate and nickel sulfate, and the nitric acid still remains in the solution.
The distillation device 6 adopts low-temperature vacuum distillation to reduce nitrogen oxides generated by decomposition of nitric acid and reduce air pollution.
Before the distillation device 6 works, a preset amount of sulfuric acid with preset concentration, such as 98% sulfuric acid or a preset amount of sulfuric acid solution generated by the first electrolysis device 10, needs to be added into the distillation device 6, and the action principle is as follows: the nitric acid solution contains nitrate (mainly copper nitrate and nickel nitrate) and nitric acid, if the nitric acid is directly distilled without adding sulfuric acid, the nitric acid reaches a boiling point during distillation and heating to form steam and then is condensed into dilute nitric acid, but the nitrate has a high boiling point and cannot be evaporated and recycled into a distillate, and the amount of the nitric acid obtained by distillation is small and the concentration is low. Sulfuric acid is added, the nitrate is replaced by nitric acid and sulfate by the sulfuric acid, and the nitric acid obtained by distillation has high content and high concentration, so that the yield of the nitric acid can be improved.
The dissolving tank 9 is filled with a dilute sulfuric acid solution for dissolving the crystal separated by the solid-liquid separation device to obtain a strong acid electrolyte containing copper sulfate, nickel sulfate and dilute sulfuric acid.
The first electrolysis device 10 comprises a cathode electrode plate and an anode electrode plate, and is used for carrying out electrolysis treatment on the strongly acidic electrolyte obtained by stirring and dissolving in the dissolving tank 9 to generate a copper plate and a sulfuric acid solution containing sulfate. (the sulfuric acid solution generated by the electrolytic regeneration device is a mixed dilute sulfuric acid solution containing nickel sulfate, sulfuric acid and a small amount of copper sulfate)
Copper plate and sulfuric acid production by electrolysis principle: copper sulfate is ionized into sulfate ions (SO42-) and copper ions (Cu2+) in the solution, water is ionized into hydroxide ions (OH-) and acid ions (H +), wherein C (SO42-) + C (OH-) ═ C (Cu2+) + C (H +). Under the condition of introducing direct current, cationic copper ions (Cu2+) in the nickel sulfate migrate to the cathode and are reduced and consumed on the surface of the cathode to obtain a metal copper plate; the anionic hydroxide ions (OH-) in the water migrate to the anode and are oxidized to oxygen (O2) by the anode surface. Copper ions (Cu2+) and hydroxyl ions (OH-) are consumed, the concentration is greatly reduced, the concentration of acid radical ions (H +) and sulfate ions (SO42-) is unchanged, and the acid radical ions (H +) and the sulfate ions (SO42-) are integrated to generate sulfuric acid; the nickel ions do not react with the cathode and the anode under the strong acidic condition.
Specifically, the content of nickel powder in the replacement device 11 is 10g/L, the particle size of the nickel powder is 50 meshes, and the reaction time is 24 hours, so that the copper in the electrolyte can be reduced to 10 ppm.
As an optional implementation manner, the system further comprises a concentration adjusting device 14 and a concentrated nitric acid storage tank 15, wherein the concentration adjusting device 14 is configured to adjust a preset proportion of the nitric acid distillate stored in the distillate storage tank 8 and the concentrated nitric acid output from the concentrated nitric acid storage tank 15, and input the nitric acid distillate and the concentrated nitric acid into the reduction tank 1.
So, through increasing blending device and concentrated nitric acid storage tank 15, the cooperation distillate storage jar 8 uses, can let in the returning ferry 1 again with the nitric acid after retrieving and use, has realized the recovery of nitric acid and has recycled.
As an alternative embodiment, the distillation device 6 is further configured to output the distilled concentrated solution to the freezing and crystallizing device 4. In the operation process of the distillation device 6, the concentrated solution which is rich in various metal impurities is always remained, wherein copper ions and nickel ions are contained, and the concentrated solution is added into the freezing crystallization device 4, so that the yield of the elemental metal can be improved, and the environment pollution is avoided.
As an optional implementation manner, the system further comprises a regenerated sulfuric acid storage tank 16, where the regenerated sulfuric acid storage tank 16 is used for storing the solution output by the first electrolysis device 10, and the regenerated sulfuric acid storage tank 16 is further used for mixing the solution with the concentrated sulfuric acid in the concentrated sulfuric acid storage tank 3 in a preset ratio and outputting the mixture to the deplating solution storage tank 2, so as to reduce the usage amount of pure concentrated sulfuric acid. Through calculation, the consumption of pure concentrated sulfuric acid can be reduced by about 90%.
The concentration of nickel ions in the solution obtained by the first electrolysis device 10 is limited, and if the nickel ions are directly replaced and the elemental nickel is recycled by secondary electrolysis, the efficiency is not high, so that the solution obtained by the first electrolysis device 10 can be firstly placed in the regenerated sulfuric acid storage tank 16, and then the solution and the concentrated sulfuric acid in the concentrated sulfuric acid storage tank 3 are mixed according to a preset proportion and then introduced into the deplating solution storage tank 2 to perform the process of converting nitrate into sulfate, on one hand, the use amount of the concentrated sulfuric acid is reduced, on the other hand, the content of the nickel ions in the solution is improved by recycling, and after the nickel ions reach a preset concentration (for example, the nickel ions are close to saturation), the secondary electrolysis is performed to obtain the elemental nickel.
Specifically, the solid nickel is nickel powder, the nickel powder can perform a displacement reaction with copper ions in the regenerated sulfuric acid to displace the copper ions into copper powder (copper simple substance), and the copper powder can be filtered and separated from the solution.
The utility model discloses in, at first through adding concentrated sulfuric acid in moving back the plating bath, make nitrate wherein turn into the sulfate, then the cooling makes the sulfate separate out, realize solid-liquid separation, solution after the separation is through distillation and cooling, obtain pure nitric acid solution, the crystal that solid-liquid separation obtained is dissolved and is carried out the electrolysis, make simple substance copper separate out, the impurity metal ion in solution is gone out to the rethread nickel replacement method, then carry out the secondary electrolysis, obtain simple substance nickel, thereby nitric acid in having realized moving back the plating bath, the recycle of copper and nickel, the innocent treatment to moving back the plating bath has been realized.
As a second aspect of the present invention, as shown in FIG. 2, there is provided a method for recycling nitric acid deplating solution, comprising
Step S10, adding sulfuric acid with preset concentration into the deplating solution according to a preset proportion so as to convert nitrate in the deplating solution into sulfate and free nitric acid and obtain a sulfate-containing nitric acid solution;
step S20, crystallizing and precipitating sulfate by a cooling and freezing mode;
step S30, carrying out solid-liquid separation on the sulfate crystal and the nitric acid solution;
step S40, distilling and condensing the nitric acid solution to obtain pure nitric acid distillate;
step S50, electrolyzing the sulfate crystal by using dilute sulfuric acid electrolyte to obtain elemental copper and sulfuric acid solution;
step S60, after the concentration of nickel ions in the sulfuric acid solution reaches a preset concentration, adding a preset amount of simple substance nickel into the sulfuric acid solution to replace impurity metal ions in the sulfuric acid solution, and obtaining sulfuric acid containing nickel sulfate and impurity solid metal;
step S70, carrying out solid-liquid separation on the sulfuric acid solution and impurity solid metal;
and step S80, electrolyzing the sulfuric acid solution to obtain the simple substance nickel.
As an optional implementation manner, the method further comprises the step of blending the nitric acid distillate and the concentrated nitric acid according to a preset proportion to obtain nitric acid with a preset concentration, and then inputting the nitric acid into the reduction tank.
As an optional implementation manner, after distilling and condensing the nitric acid solution to obtain a pure nitric acid distillate, the method further comprises the step of cooling and freezing the concentrated solution remaining after distillation to crystallize and separate out sulfate therein.
As an optional embodiment, after the sulfate crystal is electrolyzed by using the dilute sulfuric acid electrolyte to obtain elemental copper and a sulfuric acid solution, the method further includes the steps of mixing the sulfuric acid solution and sulfuric acid with a preset concentration according to a preset ratio, and adding the deplating solution.
As an alternative embodiment, before distilling and condensing the nitric acid solution to obtain a pure nitric acid distillate, the method further comprises the step of adding a preset amount of sulfuric acid into the nitric acid solution.
The above exemplary description of the present invention is provided, and it is obvious that the present invention is not limited by the above manner, as long as the present invention adopts various insubstantial improvements of the method concept and technical solution, or the present invention is directly applied to other occasions without improvement, all within the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (5)
1. A nitric acid deplating liquid recycling system is characterized in that: comprises that
A transition groove is withdrawn;
the deplating liquid storage tank is used for receiving the deplating liquid output by the deplating groove;
the concentrated sulfuric acid storage tank is used for providing a preset amount of concentrated sulfuric acid into the deplating solution storage tank so as to convert nitrate in the deplating solution into sulfate and free nitric acid;
the freezing and crystallizing device is used for cooling the deplating liquid added with the concentrated sulfuric acid so as to separate out sulfate crystals;
the first solid-liquid separation device is used for separating sulfate crystals from free nitric acid to obtain sulfate crystals and a nitric acid solution;
the distillation device is used for distilling the nitric acid solution obtained by the first solid-liquid separation device;
the inlet of the condenser is connected to the outlet of the distillation device and is used for collecting nitric acid steam output by the distillation device;
the distillate storage tank is used for collecting the distillate output by the condenser;
the dissolving tank is used for dissolving the sulfate crystals obtained by the first solid-liquid separation device to obtain a sulfate solution;
the first electrolysis device is used for electrolyzing copper sulfate in the sulfate solution output by the dissolving tank;
the replacement device is used for adding solid nickel into the solution output by the first electrolysis device to replace impurity metal ions in the solution and obtain a nickel sulfate solution and impurity solid metal;
the second solid-liquid separation device is used for separating the nickel sulfate solution from impurity solid metal;
and the second electrolysis device is used for electrolyzing the nickel sulfate solution.
2. A nitric acid deplating solution recycling system according to claim 1, wherein: the concentration adjusting device is used for adjusting the nitric acid distillate stored in the distillate storage tank and the concentrated nitric acid output by the concentrated nitric acid storage tank according to a preset proportion, and inputting the nitric acid distillate and the concentrated nitric acid into the transition groove.
3. A nitric acid deplating solution recycling system according to claim 1, wherein: the distillation device is also used for outputting the distilled concentrated solution to the freezing and crystallizing device.
4. A nitric acid deplating solution recycling system according to claim 1, wherein: still include regeneration sulphuric acid storage jar, regeneration sulphuric acid storage jar is used for the storage the solution of first electrolytic device output, regeneration sulphuric acid storage jar still is used for exporting to the deplating liquid storage tank after the concentrated sulfuric acid in solution and the concentrated sulfuric acid storage tank mixes with preset proportion.
5. A nitric acid deplating solution recycling system according to claim 1, wherein: the solid nickel is nickel powder.
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| CN201921432922.4U CN210683962U (en) | 2019-08-30 | 2019-08-30 | Nitric acid deplating liquid recycling system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112708885A (en) * | 2020-12-16 | 2021-04-27 | 华润环保发展有限公司 | Recycling method and system for copper-etching waste nitric acid |
| CN113073328A (en) * | 2021-03-23 | 2021-07-06 | 江苏净拓环保科技有限公司 | Nitric acid deplating cyclic regeneration system and method |
-
2019
- 2019-08-30 CN CN201921432922.4U patent/CN210683962U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112708885A (en) * | 2020-12-16 | 2021-04-27 | 华润环保发展有限公司 | Recycling method and system for copper-etching waste nitric acid |
| CN113073328A (en) * | 2021-03-23 | 2021-07-06 | 江苏净拓环保科技有限公司 | Nitric acid deplating cyclic regeneration system and method |
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