CN112759114A - Treatment method of metal electroplating waste liquid - Google Patents
Treatment method of metal electroplating waste liquid Download PDFInfo
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- CN112759114A CN112759114A CN202011482980.5A CN202011482980A CN112759114A CN 112759114 A CN112759114 A CN 112759114A CN 202011482980 A CN202011482980 A CN 202011482980A CN 112759114 A CN112759114 A CN 112759114A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
Abstract
The invention provides a method for treating metal electroplating waste liquid, which comprises the following steps: obtaining a pretreatment electroplating solution; filtering to remove precipitate to obtain upper layer waste liquid A; filtering to remove precipitate to obtain upper layer waste liquid B; adsorbing and exhausting residual waste liquid in the adsorption tank; introducing into an ion exchange resin system, collecting in a recovery water pool, and recycling. The invention adopts the mixed solution of sulfuric acid and hydrogen peroxide and ammonia water to perform precipitation treatment on the metal electroplating waste liquid in the coagulating sedimentation tank, adopts sodium hydroxide solution and sodium hydrosulfite to perform secondary precipitation treatment on the metal electroplating waste liquid, is convenient to remove harmful metals in the metal electroplating waste liquid, has simple and convenient operation, and adopts Fe3O4Is a core, SiO2The nano particles serving as the shell layer are used as an adsorbent, and the mixed solution is treated by an ion exchange resin system, so that the adsorption efficiency is improved, and the treatment cost of the electroplating waste liquid is reduced.
Description
Technical Field
The invention relates to the technical field of electroplating waste liquid treatment, in particular to a treatment method of metal electroplating waste liquid.
Background
The electroplating technology plays a very important role in modern industrial society, and electroplating can form a required plating layer on the surface of a device according to requirements, so that the electroplating technology plays a very important role in industry. The main plating species of electroplating comprise nickel plating, chromium plating, silver plating, copper plating and the like, waste liquid containing nickel, chromium, silver and copper is inevitably generated correspondingly in the electroplating production process, and the waste liquid generated in the electroplating industrial process needs to be treated due to the pollution of the waste liquid. However, the current treatment method of metal plating waste liquid has problems of poor operability and low adsorption efficiency, which increases the treatment cost of the plating waste liquid.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a method for treating metal electroplating waste liquid.
In order to achieve the purpose, the invention adopts the following technical scheme:
a treatment method of metal electroplating waste liquid comprises the following steps:
(1) freely settling electroplating waste liquid generated in the electroplating process to remove suspended matters, and filtering fine particles larger than 4 microns in the electroplating waste liquid to obtain pretreated electroplating liquid;
(2) conveying the pretreated electroplating solution obtained in the step (1) into a coagulating sedimentation tank, adding a mixed solution of sulfuric acid and hydrogen peroxide, stirring by a stirring device to fully mix the solution, adding ammonia water, stirring and mixing for 10-20min, layering the mixed solution in the coagulating sedimentation tank, and filtering to remove precipitates to obtain an upper-layer waste liquid A;
(3) adding a sodium hydroxide solution into the waste liquid A obtained in the step (2), stirring the mixed liquid in the coagulating sedimentation tank for 10-15min by a stirring device, adding sodium hydrosulfite after reaction for reaction, layering the mixed liquid in the coagulating sedimentation tank, and filtering to remove precipitates to obtain an upper-layer waste liquid B;
(4) injecting the waste liquid B obtained in the step (3) into a treatment reaction tank, adding acid to adjust the pH to 2.5-4, conveying the waste liquid B into an adsorption tank, and adding Fe3O4Is a core, SiO2The nano particles as the shell layer are continuously adsorbed to the adsorption tank by using the adsorbent, the adsorption is stopped when the COD of the water reaches 150-165mg/L, and the residual waste liquid in the adsorption tank is drained after the adsorption is finished;
(5) and (4) introducing the waste liquid in the step (4) into an ion exchange resin system, sequentially analyzing the waste liquid by sulfuric acid, distilled water and ethanol to obtain a treatment solution, and collecting the treated solution into a recovery water tank for recycling.
Preferably, the volume ratio of the sulfuric acid to the hydrogen peroxide in the mixed solution of the sulfuric acid and the hydrogen peroxide in the step (2) is 1: 4-8.
Preferably, the ammonia water in the step (2) is 18-23% by mass.
Preferably, the mass fraction of the sodium hydroxide solution in the step (3) is 0.1-1% of the sodium hydroxide solution.
Preferably, the stirring speed of the stirring device in the step (2) and the step (3) is 300-450 r/min.
Preferably, the adsorption time in the step (4) is 3 to 6 hours.
Preferably, the ethanol used in the step (5) is ethanol with a mass concentration of 60-95%.
The invention has the beneficial effects that: compared with the prior art, the invention provides a treatment method of metal electroplating waste liquid, which adopts mixed solution of sulfuric acid and hydrogen peroxide and ammonia water to carry out precipitation treatment on the metal electroplating waste liquid in a coagulating sedimentation tank, adopts sodium hydroxide solution and sodium hydrosulfite to carry out secondary precipitation treatment on the metal electroplating waste liquid, is convenient to remove harmful metals in the metal electroplating waste liquid, has simple and convenient operation, and adopts Fe3O4Is a core, SiO2The nano particles serving as the shell layer are used as an adsorbent, and the mixed solution is treated by an ion exchange resin system, so that the adsorption efficiency is improved, and the treatment cost of the electroplating waste liquid is reduced.
Detailed Description
The invention is further illustrated by the following examples:
a treatment method of metal electroplating waste liquid comprises the following steps:
(1) freely settling electroplating waste liquid generated in the electroplating process to remove suspended matters, and filtering fine particles larger than 4 microns in the electroplating waste liquid to obtain pretreated electroplating liquid;
(2) conveying the pretreated electroplating solution obtained in the step (1) into a coagulating sedimentation tank, adding a mixed solution of sulfuric acid and hydrogen peroxide, stirring by a stirring device to fully mix the solution, adding ammonia water, stirring and mixing for 10-20min, layering the mixed solution in the coagulating sedimentation tank, and filtering to remove precipitates to obtain an upper-layer waste liquid A;
(3) adding a sodium hydroxide solution into the waste liquid A obtained in the step (2), stirring the mixed liquid in the coagulating sedimentation tank for 10-15min by a stirring device, adding sodium hydrosulfite after reaction for reaction, layering the mixed liquid in the coagulating sedimentation tank, and filtering to remove precipitates to obtain an upper-layer waste liquid B;
(4) injecting the waste liquid B obtained in the step (3) into a treatment reaction tank, adding acid to adjust the pH to 2.5-4, conveying the waste liquid B into an adsorption tank, and adding Fe3O4Is a core, SiO2The nano particles as the shell layer are continuously adsorbed to the adsorption tank by using the adsorbent, the adsorption is stopped when the COD of the water reaches 150-165mg/L, and the residual waste liquid in the adsorption tank is drained after the adsorption is finished;
(5) and (4) introducing the waste liquid in the step (4) into an ion exchange resin system, sequentially analyzing the waste liquid by sulfuric acid, distilled water and ethanol to obtain a treatment solution, and collecting the treated solution into a recovery water tank for recycling.
Preferably, the volume ratio of the sulfuric acid to the hydrogen peroxide in the mixed solution of the sulfuric acid and the hydrogen peroxide in the step (2) is 1: 4-8.
Preferably, the ammonia water in the step (2) is 18-23% by mass.
Preferably, the mass fraction of the sodium hydroxide solution in the step (3) is 0.1-1% of the sodium hydroxide solution.
Preferably, the stirring speed of the stirring device in the step (2) and the step (3) is 300-450 r/min.
Preferably, the adsorption time in the step (4) is 3 to 6 hours.
Preferably, the ethanol used in the step (5) is ethanol with a mass concentration of 60-95%.
Example 1
A treatment method of metal electroplating waste liquid comprises the following steps:
(1) freely settling electroplating waste liquid generated in the electroplating process to remove suspended matters, and filtering fine particles larger than 4 microns in the electroplating waste liquid to obtain pretreated electroplating liquid;
(2) conveying the pretreated electroplating solution obtained in the step (1) into a coagulating sedimentation tank, adding a mixed solution of sulfuric acid and hydrogen peroxide, wherein the volume ratio of the sulfuric acid to the hydrogen peroxide in the mixed solution of the sulfuric acid and the hydrogen peroxide is 1:4, stirring by a stirring device to fully mix, wherein the stirring speed of the stirring device is 300r/min, then adding ammonia water, stirring and mixing for 10min, wherein the ammonia water is 18% ammonia water in mass percentage concentration, layering the mixed solution in the coagulating sedimentation tank, and filtering to remove precipitates to obtain upper-layer waste liquid A;
(3) adding a sodium hydroxide solution into the waste liquor A obtained in the step (2), wherein the sodium hydroxide solution is 0.1% by mass, stirring the mixed liquor in the coagulating sedimentation tank for 10min by using a stirring device, wherein the stirring speed of the stirring device is 300r/min, adding sodium hydrosulfite for reaction after the reaction, layering the mixed liquor in the coagulating sedimentation tank, and filtering to remove precipitates to obtain an upper-layer waste liquor B;
(4) injecting the waste liquid B obtained in the step (3) into a treatment reaction tank, adding acid to adjust the pH to 2.5, conveying the waste liquid B into an adsorption tank, and adding Fe3O4Is a core, SiO2Continuously adsorbing the nano particles serving as the shell layer to the adsorption tank by using the nano particles as an adsorbent, stopping adsorption when COD (chemical oxygen demand) of water in the adsorption tank reaches 150mg/L, wherein the adsorption time is 3 hours, and discharging residual waste liquid in the adsorption tank after adsorption is finished;
(5) and (3) introducing the waste liquid obtained in the step (4) into an ion exchange resin system, sequentially analyzing by sulfuric acid, distilled water and ethanol to obtain a treatment solution, wherein the ethanol used is 60% ethanol in mass concentration, and collecting the treated solution into a recovery water tank for recycling.
Example 2
A treatment method of metal electroplating waste liquid comprises the following steps:
(1) freely settling electroplating waste liquid generated in the electroplating process to remove suspended matters, and filtering fine particles larger than 4 microns in the electroplating waste liquid to obtain pretreated electroplating liquid;
(2) conveying the pretreated electroplating solution obtained in the step (1) into a coagulating sedimentation tank, adding a mixed solution of sulfuric acid and hydrogen peroxide, wherein the volume ratio of the sulfuric acid to the hydrogen peroxide in the mixed solution of the sulfuric acid and the hydrogen peroxide is 1:8, stirring by a stirring device to fully mix, wherein the stirring speed of the stirring device is 450r/min, then adding ammonia water, stirring and mixing for 20min, wherein the ammonia water is 23% by mass, layering the mixed solution in the coagulating sedimentation tank, and filtering to remove precipitates to obtain an upper-layer waste liquid A;
(3) adding a sodium hydroxide solution into the waste liquid A obtained in the step (2), wherein the sodium hydroxide solution is 1% by mass, stirring the mixed liquid in the coagulating sedimentation tank for 15min by using a stirring device, the stirring speed of the stirring device is 450r/min, adding sodium hydrosulfite for reaction after the reaction, layering the mixed liquid in the coagulating sedimentation tank, and filtering to remove precipitates to obtain an upper-layer waste liquid B;
(4) injecting the waste liquid B obtained in the step (3) into a treatment reaction tank, adding acid to adjust the pH value to 4, conveying the solution to an adsorption tank, and adding Fe3O4Is a core, SiO2Continuously adsorbing the nano particles serving as the shell layer to an adsorption tank by using an adsorbent, stopping adsorption when COD (chemical oxygen demand) of water reaches 165mg/L, wherein the adsorption time is 6 hours, and discharging residual waste liquid in the adsorption tank after adsorption is finished;
(5) and (3) introducing the waste liquid obtained in the step (4) into an ion exchange resin system, sequentially analyzing by sulfuric acid, distilled water and ethanol to obtain a treatment solution, wherein the ethanol used is 95% ethanol in mass concentration, and collecting the treated solution into a recovery water tank for recycling.
Example 3
A treatment method of metal electroplating waste liquid comprises the following steps:
(1) freely settling electroplating waste liquid generated in the electroplating process to remove suspended matters, and filtering fine particles larger than 4 microns in the electroplating waste liquid to obtain pretreated electroplating liquid;
(2) conveying the pretreated electroplating solution obtained in the step (1) into a coagulating sedimentation tank, adding a mixed solution of sulfuric acid and hydrogen peroxide, wherein the volume ratio of the sulfuric acid to the hydrogen peroxide in the mixed solution of the sulfuric acid and the hydrogen peroxide is 1:6, stirring by a stirring device to fully mix, wherein the stirring speed of the stirring device is 350r/min, then adding ammonia water, stirring and mixing for 15min, wherein the ammonia water is 20% ammonia water in mass percentage concentration, layering the mixed solution in the coagulating sedimentation tank, and filtering to remove precipitates to obtain upper-layer waste liquid A;
(3) adding a sodium hydroxide solution into the waste liquor A obtained in the step (2), wherein the sodium hydroxide solution is 0.8% by mass, stirring the mixed liquor in the coagulating sedimentation tank for 13min by using a stirring device, wherein the stirring speed of the stirring device is 350r/min, adding sodium hydrosulfite for reaction after the reaction, layering the mixed liquor in the coagulating sedimentation tank, and filtering to remove precipitates to obtain an upper-layer waste liquor B;
(4) injecting the waste liquid B obtained in the step (3) into a treatment reaction tank, adding acid to adjust the pH value to 3, conveying the mixture into an adsorption tank, and adding Fe3O4Is a core, SiO2Continuously adsorbing the nano particles serving as the shell layer to an adsorption tank by using an adsorbent, stopping adsorption when COD (chemical oxygen demand) of water reaches 160mg/L, wherein the adsorption time is 4 hours, and discharging residual waste liquid in the adsorption tank after adsorption is finished;
(5) and (3) introducing the waste liquid in the step (4) into an ion exchange resin system, sequentially analyzing by sulfuric acid, distilled water and ethanol to obtain a treatment solution, wherein the used ethanol is 75% ethanol by mass concentration, and collecting the treated solution into a recovery water tank for recycling.
The invention has been described in an illustrative manner, and it is to be understood that the invention is not limited to the specific embodiments described above, but is intended to cover various modifications, which may be made by the methods and technical solutions of the invention, or may be applied to other applications without modification.
Claims (7)
1. A treatment method of metal electroplating waste liquid is characterized by comprising the following steps:
(1) freely settling electroplating waste liquid generated in the electroplating process to remove suspended matters, and filtering fine particles larger than 4 microns in the electroplating waste liquid to obtain pretreated electroplating liquid;
(2) conveying the pretreated electroplating solution obtained in the step (1) into a coagulating sedimentation tank, adding a mixed solution of sulfuric acid and hydrogen peroxide, stirring by a stirring device to fully mix the solution, adding ammonia water, stirring and mixing for 10-20min, layering the mixed solution in the coagulating sedimentation tank, and filtering to remove precipitates to obtain an upper-layer waste liquid A;
(3) adding a sodium hydroxide solution into the waste liquid A obtained in the step (2), stirring the mixed liquid in the coagulating sedimentation tank for 10-15min by a stirring device, adding sodium hydrosulfite after reaction for reaction, layering the mixed liquid in the coagulating sedimentation tank, and filtering to remove precipitates to obtain an upper-layer waste liquid B;
(4) injecting the waste liquid B obtained in the step (3) into a treatment reaction tank, adding acid to adjust the pH to 2.5-4, conveying the waste liquid B into an adsorption tank, and adding Fe3O4Is a core, SiO2The nano particles as the shell layer are continuously adsorbed to the adsorption tank by using the adsorbent, the adsorption is stopped when the COD of the water reaches 150-165mg/L, and the residual waste liquid in the adsorption tank is drained after the adsorption is finished;
(5) and (4) introducing the waste liquid in the step (4) into an ion exchange resin system, sequentially analyzing the waste liquid by sulfuric acid, distilled water and ethanol to obtain a treatment solution, and collecting the treated solution into a recovery water tank for recycling.
2. The method for treating a metal plating waste liquid according to claim 1, wherein the volume ratio of the sulfuric acid to the hydrogen peroxide in the mixed solution of the sulfuric acid and the hydrogen peroxide in the step (2) is 1: 4-8.
3. The method for treating a metal plating waste liquid according to claim 1, wherein the ammonia water in the step (2) is 18 to 23% by mass.
4. The method according to claim 1, wherein the sodium hydroxide solution in the step (3) is 0.1 to 1% by mass of an aqueous sodium hydroxide solution.
5. The method as claimed in claim 1, wherein the stirring speed of the stirring device in step (2) and step (3) is 300-450 r/min.
6. The method according to claim 1, wherein the adsorption time in the step (4) is 3 to 6 hours.
7. The method for treating a metal plating waste liquid according to claim 1, wherein the ethanol used in the step (5) is ethanol having a mass concentration of 60 to 95%.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4009101A (en) * | 1973-03-29 | 1977-02-22 | Kayabakogyo-Kabushiki-Kaisha | Recycle treatment of waste water from nickel plating |
| CN105753223A (en) * | 2016-05-12 | 2016-07-13 | 东莞市联洲知识产权运营管理有限公司 | Treatment method of electroplating effluent containing heavy metal ions |
| CN108911229A (en) * | 2018-06-02 | 2018-11-30 | 南通盛州电子科技有限公司 | A kind of cupro-nickel electroplating effluent recovery of circulatory system and recovery method |
| CN111003853A (en) * | 2019-12-23 | 2020-04-14 | 黄河水利职业技术学院 | Electroplating waste liquid treatment method |
-
2020
- 2020-12-16 CN CN202011482980.5A patent/CN112759114A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4009101A (en) * | 1973-03-29 | 1977-02-22 | Kayabakogyo-Kabushiki-Kaisha | Recycle treatment of waste water from nickel plating |
| CN105753223A (en) * | 2016-05-12 | 2016-07-13 | 东莞市联洲知识产权运营管理有限公司 | Treatment method of electroplating effluent containing heavy metal ions |
| CN108911229A (en) * | 2018-06-02 | 2018-11-30 | 南通盛州电子科技有限公司 | A kind of cupro-nickel electroplating effluent recovery of circulatory system and recovery method |
| CN111003853A (en) * | 2019-12-23 | 2020-04-14 | 黄河水利职业技术学院 | Electroplating waste liquid treatment method |
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