CN109250803B - Electroplating wastewater treatment device and treatment method - Google Patents
Electroplating wastewater treatment device and treatment method Download PDFInfo
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
- C02F1/763—Devices for the addition of such compounds in gaseous form
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
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- C02F2101/00—Nature of the contaminant
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- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/206—Manganese or manganese compounds
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- 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
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- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention provides an electroplating wastewater treatment device and a treatment method, which comprises a wastewater storage tank, wherein the wastewater storage tank is connected with an oxidation reaction tank, a stirring device is arranged in the oxidation reaction tank, the oxidation reaction tank is connected with a mixing reaction tank, the mixing reaction tank is connected with a filtering tank, and a carbon dioxide introducing device is arranged in the mixing reaction tank. Waste lithium batteries and electroplating wastewater are combined, the content of each metal in the wastewater is regulated and controlled, so that the waste lithium batteries meet the requirements of the lithium batteries, aluminum in the waste batteries is not required to be removed independently, carbon dioxide and sodium metaaluminate are used for reacting to coat the generated nickel-cobalt lithium manganate, the electrochemical performance of the lithium batteries is improved, and finally the electroplating wastewater is discharged up to the standard.
Description
Technical Field
The invention relates to the field of electroplating wastewater treatment, in particular to an electroplating wastewater treatment device and a treatment method.
Background
The electroplating wastewater mainly comprises wastewater and waste liquid discharged from electroplating factories or workshops, such as plating part rinsing water, waste bath solution, equipment cooling water, ground washing water and the like. Because the plating species is more, the process is complicated, the water quality is complex, the components are not easy to control, the electroplating wastewater mainly contains heavy metal ions such as chromium, nickel, copper and the like, cyanide and the like, and belongs to carcinogenic, teratogenic and mutagenic highly toxic substances, thereby causing great harm to the living environment of human beings and other organisms.
The electroplating wastewater can be generally divided into three types, wherein the first type is chromium-containing electroplating wastewater, the chromium ion concentration in the electroplating wastewater is higher, the second type is cyanogen-containing electroplating wastewater, the cyanide ion concentration in the wastewater is higher, and the third type is general electroplating wastewater, and the wastewater mainly contains a large amount of heavy metal ions.
For example, chinese patent 201110431946X discloses a method for recycling heavy metals from a heavy metal-containing electroplating wastewater treatment agent, which comprises the steps of: the method comprises the steps of enabling the low-concentration electroplating wastewater containing heavy metal ions to pass through ion exchange resin, enabling the heavy metal ions contained in the electroplating wastewater to be completely adsorbed on the ion exchange resin, separating clean water until the adsorption of the ion exchange resin is saturated, adding eluent to enable the heavy metal ions adsorbed on the ion exchange resin to be separated from the ion exchange resin to produce high-concentration electroplating wastewater, then adding a reducing agent into the high-concentration electroplating wastewater to perform reduction reaction to obtain a water-insoluble reduction product containing the heavy metal ions, adding a flocculating agent to accelerate the coagulation of the reduction product, finally separating precipitates by a method such as filtration or centrifugation, and recovering heavy metal substances through high-temperature calcination to serve as useful industrial raw materials.
Alloy plating is an important field of electroplating processes because alloys can combine the advantages of a single metal and have new properties, such as hardness, corrosion resistance, functionality, etc., that a single metal does not possess.
The electroplating process for making diamond bit features that the loose diamond particles are solidified in electroplated layer by electrodeposition of metal, resulting in cutting function of diamond particles. The service life of the diamond drill bit depends on the property of the matrix to a great extent, so the diamond drill bit puts very strict requirements on the performance of the matrix material, and most of ternary alloy coatings used for the diamond drill bit at present are nickel-cobalt-manganese ternary alloys.
The annual average wastewater production amount of the electroplating wastewater industry in China is up to 40 hundred million tons, which accounts for 1/6 of the total industrial wastewater discharge amount, and the components of the generated wastewater are complicated and variable due to the complexity of the electroplating wastewater. At present, most electroplating plants adopt a lime chemical precipitation method as an actual treatment mode for phosphorus-containing wastewater, but the phosphorus concentration of effluent after precipitation treatment is still maintained at 5-10mg/L, which is difficult to reach the standard.
Aiming at electroplating wastewater containing heavy metals and a large amount of phosphorus, the main treatment method at present is a precipitation method, and the method mainly has the following defects: the process is complex, the requirements on subsequent treatment process and environment are high, the purification efficiency is not high, the national discharge standard of electroplating wastewater is difficult to achieve, the investment cost is high, more treatment process steps and treatment devices are needed, a large amount of chemical reagents are consumed in the treatment process, heavy metals in the wastewater are easy to waste, and waste cannot be changed into valuables.
Disclosure of Invention
The invention provides an electroplating wastewater treatment device and a treatment method, wherein electroplating wastewater containing phosphorus, aluminum, cobalt and manganese is treated and recycled with a waste nickel-cobalt-manganese ternary lithium battery, and an aluminum oxide coated nickel-cobalt lithium manganate material is finally prepared so as to improve the recovery rates of heavy metals in the electroplating wastewater and the waste battery.
The technical scheme for realizing the invention is as follows: the utility model provides an electroplating effluent treatment plant, includes the waste water hold up tank, the waste water hold up tank links to each other with the oxidation reaction pond, is equipped with agitating unit in the oxidation reaction pond, and the oxidation reaction pond links to each other with mixed reaction pond, and mixed reaction pond links to each other with the filtering ponds, it lets in the device to be equipped with carbon dioxide in the mixed reaction pond.
The oxidation reaction tank is connected with the chlorine dioxide tank, the hydrogen peroxide tank and the sodium hypochlorite tank.
The method for treating the wastewater of the electroplating wastewater treatment device comprises the following steps:
(a) collecting electroplating wastewater containing phosphorus, aluminum, cobalt and manganese, and storing the electroplating wastewater into a wastewater storage tank;
(b) adding a sodium hydroxide solution into the wastewater, adjusting the pH value of the wastewater, adding a compound oxidant, and performing an oxidation reaction in an oxidation reaction tank;
(c) immersing the waste nickel-cobalt-manganese ternary lithium battery positive electrode piece into acid liquor, taking out the aluminum foil after the positive active material is separated from the aluminum foil current collector, adding a reducing agent into the acid liquor, heating and stirring until the ternary positive electrode material is dissolved, and filtering to obtain filtrate;
(d) mixing the wastewater in the step (b) and the filtrate in the step (c), adjusting the pH value to 1.5-5.0 in a mixed reaction tank, and regulating and controlling the contents of nickel, cobalt and manganese in the mixed solution to make the mixed solution meet the molecular formula LiNixCoyMn1-x-yO2Wherein x is>0，y>0，x+y<1, obtaining a regulating stock solution;
(e) adding sodium hydroxide solution into the regulating stock solution in the step (d) for reaction, and introducing CO after the reaction2Gas, when the aluminum content in the mixed alkali liquor is less than 50ppm, stopping introducing CO2Gas to obtain solid material;
(f) and (e) filtering, washing and drying the solid material obtained in the step (e), adding lithium carbonate after drying, uniformly mixing, and calcining at high temperature to obtain the aluminum oxide coated nickel cobalt lithium manganate material.
The mass concentration of the sodium hydroxide solution in the step (b) is 15-25wt%, and the pH value is adjusted to 7-9.
The compound oxidant in the step (b) is a mixture of chlorine dioxide, hydrogen peroxide and a sodium hypochlorite solution, wherein the mass ratio of the chlorine dioxide to the hydrogen peroxide to the sodium hypochlorite is 1: (1-2): (2-5).
The acid solution in the step (c) comprises hydrochloric acid or sulfuric acid, and the concentration of the acid solution is 0.1-10 mol/L; taking 10g of the positive pole piece of the waste nickel-cobalt-manganese ternary lithium battery as a reference, and the using amount of the acid solution is 0.5-1L.
The reducing agent in the step (c) is hydrogen peroxide, sulfite, bisulfite and thiosulfate, and the concentration of the reducing agent is 0.1-5 mol/L; the method is characterized in that 10g of the waste nickel-cobalt-manganese ternary lithium battery positive pole piece is taken as a reference, and the addition amount of a reducing agent is 0.25-0.5L.
In the step (c), the heating temperature is 30-100 ℃, and the stirring time is 40-120 min.
In the step (e), the mass ratio of the stock solution to the sodium hydroxide solution is regulated to be (20-30) to (70-80), and the mass concentration of the sodium hydroxide solution is 15-25 wt%.
The calcination temperature in the step (e) is 680-720 ℃, and the calcination time is 9-12 h.
The invention has the beneficial effects that:
(1) the method comprises the steps of firstly removing phosphorus in the phosphorus-containing low-concentration wastewater by using a compound oxidant, so that the concentration of the phosphorus in the wastewater is reduced to 2-5mg/L, and adsorbing a part of P again by using sodium metaaluminate generated in the later stage in the process of adjusting by using sodium hydroxide, so that the total phosphorus concentration of effluent meets the discharge standard;
(2) according to the invention, the waste lithium battery and the electroplating wastewater are combined, the content of each metal in the wastewater is regulated and controlled to meet the requirements of the lithium battery, aluminum in the waste battery is not required to be removed independently, the generated nickel cobalt lithium manganate is coated by utilizing the reaction of carbon dioxide and sodium metaaluminate, the electrochemical performance of the lithium battery is improved, and the electroplating wastewater finally reaches the standard and is discharged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the structure of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The utility model provides an electroplating effluent treatment plant, includes waste water hold up tank 1, waste water hold up tank 1 links to each other with oxidation reaction tank 2, is equipped with agitating unit in oxidation reaction tank 2, and oxidation reaction tank 2 links to each other with mixed reaction tank 3, and mixed reaction tank 3 links to each other with filtering ponds 4, it lets in device 5 to be equipped with carbon dioxide in the mixed reaction tank 3.
The oxidation reaction tank 2 is connected with a chlorine dioxide tank 6, a hydrogen peroxide tank 7 and a sodium hypochlorite tank 8.
Example 1
An electroplating wastewater comprehensive treatment process comprises the following steps:
(1) collecting electroplating wastewater containing phosphorus, aluminum, cobalt and manganese; wherein the phosphorus content in the electroplating wastewater is 48.9mg/L, the total manganese content is 18.2 mg/L, the total cobalt content is 6.3 mg/L, and the total aluminum content is 7.38 mg/L;
(2) adding a sodium hydroxide solution with the mass concentration of 15wt% in the morning into the wastewater, adjusting the pH value of the wastewater to 7, and adding a compound oxidant, wherein the compound oxidant is a mixture of chlorine dioxide, hydrogen peroxide and a sodium hypochlorite solution, and the mass ratio of the chlorine dioxide, the hydrogen peroxide and the sodium hypochlorite is 1: 1: 2, carrying out an oxidation reaction;
(3) immersing the positive pole piece of the waste nickel-cobalt-manganese ternary lithium battery into a hydrochloric acid solution with the concentration of 0.1mol/L, wherein the use amount of the hydrochloric acid solution is 0.5L on the basis of 10g of the positive pole piece of the waste nickel-cobalt-manganese ternary lithium battery; after the positive electrode active material is separated from the aluminum foil current collector, taking out the aluminum foil, adding hydrogen peroxide with the concentration of 0.1mol/L into acid liquor, heating to 30 ℃, stirring for 120 min until the ternary positive electrode material is dissolved, and filtering to obtain filtrate; taking 10g of the positive pole piece of the waste nickel-cobalt-manganese ternary lithium battery as a reference, wherein the addition amount of the reducing agent is 0.25L;
(4) mixing the wastewater obtained in the step (2) and the filtrate obtained in the step (3), adjusting the pH to 1.5, and regulating and controlling the contents of nickel, cobalt and manganese in the mixed solution to make the nickel, cobalt and manganese meet the molecular formula LiNi0.5Co0.2Mn0.3O2Is regulated and controlledStock solution;
(5) adding sodium hydroxide solution into the regulating stock solution in the step (4) for reaction, wherein the mass ratio of the regulating stock solution to the sodium hydroxide solution is 20:80, the mass concentration of the sodium hydroxide solution is 15wt%, and introducing CO after the reaction2Gas, when the aluminum content in the mixed alkali liquor is less than 50ppm, stopping introducing CO2Gas to obtain solid material;
(6) and (3) filtering, washing and drying the solid material obtained in the step (5), adding lithium carbonate after drying, uniformly mixing, and calcining at high temperature, wherein the calcining temperature is 680 ℃, the calcining time is 12 hours, so as to obtain the aluminum oxide coated nickel cobalt lithium manganate material, and the lithium content in the aluminum oxide coated nickel cobalt lithium manganate material reaches 8 wt%.
Properties of the alumina-coated lithium nickel cobalt manganese oxide Material prepared in example 1
In the embodiment, the content of phosphorus in the wastewater can be reduced to be below 0.5mg/L, the discharge standard of electroplating pollutants is reached, the content of metal ions in the wastewater can be recycled, and finally the wastewater is discharged up to the standard.
Example 2
An electroplating wastewater comprehensive treatment process comprises the following steps:
(1) collecting electroplating wastewater containing phosphorus, aluminum, cobalt and manganese; wherein the phosphorus content in the electroplating wastewater is 48.9mg/L, the total manganese content is 18.2 mg/L, the total cobalt content is 6.3 mg/L, and the total aluminum content is 7.38 mg/L;
(2) adding a sodium hydroxide solution with the mass concentration of 20wt% in the morning into the wastewater, adjusting the pH value of the wastewater to 8, and adding a compound oxidant, wherein the compound oxidant is a mixture of chlorine dioxide, hydrogen peroxide and a sodium hypochlorite solution, and the mass ratio of the chlorine dioxide, the hydrogen peroxide and the sodium hypochlorite is 1: 1.5: 3, carrying out oxidation reaction;
(3) immersing the waste nickel-cobalt-manganese ternary lithium battery positive pole piece into a hydrochloric acid or sulfuric acid solution with the concentration of 5 mol/L, taking out the aluminum foil after the positive active material is separated from the aluminum foil current collector, adding sodium sulfite with the concentration of 3 mol/L into an acid solution, heating to 80 ℃, stirring for 80 min until the ternary positive pole material is dissolved, and filtering to obtain a filtrate; taking 10g of the positive pole piece of the waste nickel-cobalt-manganese ternary lithium battery as a reference, wherein the addition amount of the reducing agent is 0.4L;
(4) mixing the wastewater obtained in the step (2) and the filtrate obtained in the step (3), adjusting the pH to 3.0, and regulating and controlling the contents of nickel, cobalt and manganese in the mixed solution to make the nickel, cobalt and manganese meet the molecular formula LiNi0.5Co0.2Mn0.3O2Obtaining a regulating and controlling stock solution;
(5) adding sodium hydroxide solution into the regulating stock solution in the step (4) for reaction, wherein the mass ratio of the regulating stock solution to the sodium hydroxide solution is 25:75, the mass concentration of the sodium hydroxide solution is 20wt%, and introducing CO after the reaction2Gas, when the aluminum content in the mixed alkali liquor is less than 50ppm, stopping introducing CO2Gas to obtain solid material;
(6) and (3) filtering, washing and drying the solid material obtained in the step (5), adding lithium carbonate after drying, uniformly mixing, and calcining at a high temperature of 700 ℃ for 10 hours to obtain the aluminum oxide coated nickel cobalt lithium manganate material, wherein the lithium content in the aluminum oxide coated nickel cobalt lithium manganate material reaches 7 wt%.
Properties of the alumina-coated lithium nickel cobalt manganese oxide Material prepared in example 2
In the embodiment, the content of phosphorus in the wastewater can be reduced to be below 0.48mg/L, the discharge standard of electroplating pollutants is met, the content of metal ions in the wastewater can be recycled, and finally the wastewater is discharged up to the standard.
Example 3
An electroplating wastewater comprehensive treatment process comprises the following steps:
(1) collecting electroplating wastewater containing phosphorus, aluminum, cobalt and manganese; wherein the phosphorus content in the electroplating wastewater is 48.9mg/L, the total manganese content is 18.2 mg/L, the total cobalt content is 6.3 mg/L, and the total aluminum content is 7.38 mg/L;
(2) adding a sodium hydroxide solution with the mass concentration of 25wt% in the morning into the wastewater, adjusting the pH value of the wastewater to 9, and adding a compound oxidant, wherein the compound oxidant is a mixture of chlorine dioxide, hydrogen peroxide and a sodium hypochlorite solution, and the mass ratio of the chlorine dioxide, the hydrogen peroxide and the sodium hypochlorite is 1: 2: 5, carrying out oxidation reaction;
(3) immersing the anode piece of the waste nickel-cobalt-manganese ternary lithium battery into a hydrochloric acid or sulfuric acid solution with the concentration of 10 mol/L, taking out the aluminum foil after the anode active material is separated from the aluminum foil current collector, adding sodium bisulfite with the concentration of 5 mol/L into the acid solution, heating to 100 ℃, stirring for 40 min until the ternary anode material is dissolved, and filtering to obtain a filtrate; taking 10g of the positive pole piece of the waste nickel-cobalt-manganese ternary lithium battery as a reference, wherein the addition amount of the reducing agent is 0.5L;
(4) mixing the wastewater obtained in the step (2) and the filtrate obtained in the step (3), adjusting the pH to 5.0, and regulating and controlling the contents of nickel, cobalt and manganese in the mixed solution to make the nickel, cobalt and manganese meet the molecular formula LiNi0.6Co0.2Mn0.2O2Wherein x is>0，y>0，x+y<1, obtaining a regulating stock solution;
(5) adding sodium hydroxide solution into the regulating stock solution in the step (4) for reaction, wherein the mass ratio of the regulating stock solution to the sodium hydroxide solution is 30:70, the mass concentration of the sodium hydroxide solution is 25wt%, and introducing CO after the reaction2Gas, when the aluminum content in the mixed alkali liquor is less than 50ppm, stopping introducing CO2Gas to obtain solid material;
(6) and (3) filtering, washing and drying the solid material obtained in the step (5), adding lithium carbonate after drying, uniformly mixing, and calcining at high temperature, wherein the calcining temperature is 720 ℃, the calcining time is 9 hours, so that the nickel-cobalt lithium manganate material coated with the aluminum oxide is obtained, and the lithium content in the nickel-cobalt lithium manganate material coated with the aluminum oxide reaches 7.5 wt%.
Properties of the alumina-coated lithium nickel cobalt manganese oxide Material prepared in example 3
In the embodiment, the content of phosphorus in the wastewater can be reduced to be below 0.35mg/L, the discharge standard of electroplating pollutants is reached, the content of metal ions in the wastewater can be recycled, and finally the wastewater is discharged up to the standard.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A method for treating electroplating wastewater is characterized by comprising the following steps: the method comprises the following steps:
(a) collecting electroplating wastewater containing phosphorus, aluminum, cobalt and manganese, and storing the electroplating wastewater into a wastewater storage tank (1);
(b) adding a sodium hydroxide solution into the wastewater, adjusting the pH value of the wastewater, adding a compound oxidant, and performing an oxidation reaction in an oxidation reaction tank (2);
(c) immersing the waste nickel-cobalt-manganese ternary lithium battery positive electrode piece into acid liquor, taking out the aluminum foil after the positive active material is separated from the aluminum foil current collector, adding a reducing agent into the acid liquor, heating and stirring until the ternary positive electrode material is dissolved, and filtering to obtain filtrate;
(d) mixing the wastewater in the step (b) and the filtrate in the step (c), adjusting the pH value in the mixed reaction tank (3) to be 1.5-5.0, and regulating and controlling the contents of nickel, cobalt and manganese in the mixed solution to enable the mixed solution to accord with the molecular formula LiNixCoyMn1-x-yO2Wherein x is>0，y>0，x+y<1, obtaining a regulating stock solution;
(e) adding sodium hydroxide solution into the regulating stock solution in the step (d) for reaction, and introducing CO after the reaction2Gas, when the aluminum content in the mixed alkali liquor is less than 50ppm, stopping introducing CO2Gas to obtain solid material;
(f) filtering, washing and drying the solid material obtained in the step (e), adding lithium carbonate after drying, uniformly mixing, and calcining at high temperature to obtain an aluminum oxide coated nickel cobalt lithium manganate material;
wherein electroplating effluent treatment plant, including waste water hold up tank (1), waste water hold up tank (1) links to each other with oxidation reaction pond (2), is equipped with agitating unit in oxidation reaction pond (2), and oxidation reaction pond (2) link to each other with mixed reaction pond (3), and mixed reaction pond (3) link to each other with filtering ponds (4), it lets in device (5) to be equipped with carbon dioxide in mixed reaction pond (3).
2. The method for treating electroplating wastewater according to claim 1, wherein: the oxidation reaction tank (2) is connected with a chlorine dioxide tank (6), a hydrogen peroxide tank (7) and a sodium hypochlorite tank (8).
3. The method for treating electroplating wastewater according to claim 1, wherein: the mass concentration of the sodium hydroxide solution in the step (b) is 15-25wt%, and the pH value is adjusted to 7-9.
4. The method for treating electroplating wastewater according to claim 1, wherein: the compound oxidant in the step (b) is a mixture of chlorine dioxide, hydrogen peroxide and a sodium hypochlorite solution, wherein the mass ratio of the chlorine dioxide to the hydrogen peroxide to the sodium hypochlorite is 1: (1-2): (2-5).
5. The method for treating electroplating wastewater according to claim 1, wherein: the acid solution in the step (c) comprises hydrochloric acid or sulfuric acid, and the concentration of the acid solution is 0.1-10 mol/L; taking 10g of the positive pole piece of the waste nickel-cobalt-manganese ternary lithium battery as a reference, and the using amount of the acid solution is 0.5-1L.
6. The method for treating electroplating wastewater according to claim 1, wherein: the reducing agent in the step (c) is hydrogen peroxide, sulfite, bisulfite and thiosulfate, and the concentration of the reducing agent is 0.1-5 mol/L; the method is characterized in that 10g of the waste nickel-cobalt-manganese ternary lithium battery positive pole piece is taken as a reference, and the addition amount of a reducing agent is 0.25-0.5L.
7. The method for treating electroplating wastewater according to claim 1, wherein: in the step (c), the heating temperature is 30-100 ℃, and the stirring time is 40-120 min.
8. The method for treating electroplating wastewater according to claim 1, wherein: in the step (e), the mass ratio of the stock solution to the sodium hydroxide solution is regulated to be (20-30) to (70-80), and the mass concentration of the sodium hydroxide solution is 15-25 wt%.
9. The method for treating electroplating wastewater according to claim 1, wherein: the calcination temperature in the step (f) is 680-720 ℃, and the calcination time is 9-12 h.
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