Extracting agent and method for purifying cyanided copper-containing wastewater by using same

Abstract

The invention provides an extraction agent and a method for purifying cyanided copper-containing wastewater by using the extraction agent, and belongs to the technical field of wastewater purification. According to the extraction agent, an imidazole ring is used as a molecular skeleton, an aliphatic chain functional group is introduced through quaternization reaction, the hydrophobic property of the extraction agent is adjusted, and it is guaranteed that the extraction agent is not dissolved in an inorganic water phase. S-activation sites are formed by derivatization of amino, formation of thioester groups and hydrolysis of terminal sulfydryl under the alkaline condition and can be effectively bonded with copper ions (I), meanwhile, the S-activation sites and lone pair electrons on adjacent N atoms cooperate with each other to chelate the copper ions (I) to the maximum extent, it is guaranteed that the copper ions exist in the form of chelate, and the copper ions can be effectively bonded to the copper ions (I). And further conversion into a free state form is avoided. In addition, lone pair electrons on an N atom and carboxyl can cooperate with each other, so that targeted chelation of copper ions (II) in a solution is realized. According to the method, copper in the cyanide-containing wastewater is efficiently extracted, and the purpose of purifying the cyanide copper-containing wastewater is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater purification, and particularly to an extractant and a method for purifying copper cyanide-containing wastewater using the same. Background Art

[0002] Copper-containing wastewater generated in industries such as chemical engineering / painting and electroplating often exists in the form of cyanide complexes. The copper element in the copper cyanide-containing wastewater exhibits different valence states, such as [Cu(CN) 2 - , [Cu(CN) 3 2- , [Cu(CN) 4 3- . The copper plating rinse wastewater contains 300 - 450 mg / L of free cyanide ions and 400 - 550 mg / L of [Cu(CN) 2 - or [Cu(CN) 4 3- .

[0003] In the prior art, the treatment measures for copper cyanide-containing wastewater mainly include acidification aeration alkali liquor neutralization method, chlorination method, electrolytic oxidation method, ferrous sulfate complexation method, air stripping method, etc. Among them, the alkali chlorination method is prone to cause secondary pollution, the purification degree of the ferrous sulfate complexation method is incomplete, the electrolytic oxidation method has high energy consumption, and the air stripping method pollutes the atmosphere. Compared with the above methods, the extraction process is not prone to cause secondary pollution and has a high purification degree, showing obvious advantages.

[0004] The extraction capacity is defined as the maximum capacity of the target ion to be retained. If the total amount of the target ion exceeds the capacity of the extractant, it will cause incomplete extraction of the target ion, remaining in the inorganic phase, and ultimately affecting the purification effect of the target ion. Since the content in the copper cyanide-containing waste liquid is relatively large and the extraction capacity of the existing extractants is limited, it is difficult to achieve efficient extraction of copper. In order to meet the national discharge standards for the effluent, a large amount of extractant is required.

[0005] In view of this, it is necessary to design an improved extractant and a method for purifying copper cyanide-containing wastewater to solve the above problems. Summary of the Invention

[0006] In view of the technical problems existing in the background art, the present application provides an extractant and a method for purifying copper cyanide-containing wastewater using the same. The extractant uses an imidazole ring as the molecular backbone, and through a quaternization reaction, an aliphatic chain functional group is introduced to adjust the hydrophobic property of the extractant, ensuring that the extractant is insoluble in the inorganic aqueous phase. By derivatizing the amino group, a thioester group is formed, and the terminal mercapto group hydrolyzes under alkaline conditions to form an S - activation site, which can effectively bond with cuprous ions (Ⅰ). At the same time, S - ​​​​​The activation site and the lone pair electrons on the adjacent N atom cooperate with each other to maximize the chelation of copper ions (I), ensuring that the copper ions exist in the form of chelates and will not be further converted into the free state. In addition, the lone pair electrons on the N atom and the carboxyl group can cooperate with each other to achieve the targeted chelation of copper ions (II) in the solution. At the same time, the steric effect of the thioester group results in the final chelation product existing in the trans form, and this spatial orientation greatly improves the stability of the copper chelate, which is beneficial to the conversion of copper ions (II) from the inorganic interface to the organic interface during the extraction process.

[0007] That is, by designing the molecular skeleton of the extractant, the types of functional group derivatization, and the regulation of steric hindrance, the present application ensures the efficient chelation of the activation site of the extractant molecule with copper ions of different valence states, realizes the efficient extraction of copper in the cyanide-containing wastewater, and achieves the purpose of purifying the copper-containing cyanide wastewater.

[0008] In the first aspect, the present application provides an extractant, and the structural formula of the extractant is as follows: .

[0009] In the second aspect, the present application provides a method for purifying copper-containing cyanide wastewater with an extractant. The extraction is carried out using the aforementioned extractant, and the method includes the following steps: S1, mixing and dissolving the extractant with a diluent to obtain an extractant diluent; S2, adding the extractant diluent to the copper-containing cyanide alkaline solution to achieve the selective extraction of copper in the cyanide solution.

[0010] Further, the pH range of the copper-containing cyanide alkaline solution is 9-11.

[0011] Further, the diluent is sulfonated kerosene.

[0012] Further, copper exists in the form of [Cu(CN) 2 - , [Cu(CN) 3 2- , [Cu(CN) 4 3- in the solution.

[0013] Further, in the extractant diluent, the volume ratio of the extractant to the diluent is 1:(10-100).

[0014] Further, the concentration range of free cyanide in the copper-containing cyanide alkaline solution is 100 mg / L-1000 mg / L, and the concentration range of total cyanide is 100 mg / L-2000 mg / L.

[0015] ​​​Further, the copper-containing cyanide wastewater is one or more of the copper-containing cyanide waste liquid remaining after the activated carbon adsorption of the cyanide gold extraction solution, the copper-containing cyanide waste liquid remaining after the ion exchange resin adsorption of the cyanide gold extraction solution, the copper-containing cyanide electroplating waste liquid, and the copper plating rinsing wastewater.

[0016] Further, the volume ratio of the diluent of the extractant to the copper-containing alkaline cyanide solution is 1:(1 - 10).

[0017] The beneficial effects of this application are as follows: 1) This application provides an extractant. This extractant uses an imidazole ring as the molecular skeleton. Through quaternization reaction, aliphatic chain functional groups are introduced to adjust the hydrophobic property of the extractant, ensuring that the extractant is insoluble in the inorganic aqueous phase. By derivatizing the amino group to form a thioester group, the terminal mercapto group hydrolyzes under alkaline conditions to form an S - activation site, which can effectively bond with cuprous ions (Ⅰ). At the same time, the S - activation site and the lone pair electrons on the adjacent N atom cooperate with each other to chelate cuprous ions (Ⅰ) to the greatest extent, ensuring that the cuprous ions exist in the form of chelates and will not be further converted into the free state. Moreover, the lone pair electrons on the N atom and the carboxyl group can cooperate with each other to achieve targeted chelation of cupric ions (Ⅱ) in the solution. At the same time, the steric effect of the thioester group causes the final chelation product to exist in the trans form, and this spatial orientation greatly improves the stability of the copper chelate, which is beneficial to the conversion of cupric ions (Ⅱ) from the inorganic interface to the organic interface during the extraction process.

[0018] 2) By designing the molecular skeleton of the extractant, regulating the types of functional group derivatization and steric hindrance, this application ensures the efficient chelation of the activation sites of the extractant molecules with cupric ions of different valence states, realizes the efficient extraction of copper in the cyanide-containing wastewater, and achieves the purpose of purifying the copper-containing cyanide wastewater.

[0019] The above description is only an overview of the technical solution of this application. In order to be able to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the specific embodiments of this application are specifically given below. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solution of this application, the drawings used in this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is the synthesis route diagram of the extractant provided by this application.

[0022] Figure 2 The physical diagram of the extractant provided for this application.

[0023] Figure 3 The 1H NMR spectrum of the extractant provided for this application; among them, (a) is the full 1H NMR spectrum, and (b) is the enlarged spectrum in the range of chemical shift 0.5 - 4 ppm of the 1H NMR spectrum.

[0024] Figure 4 The mechanism diagram of the interaction between the extractant provided for this application and copper ions. Detailed implementation manners

[0025] Next, embodiments of the technical solution of this application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of this application, so they are only examples and cannot be used to limit the protection scope of this application.

[0026] In a first aspect, an embodiment of this application provides an extractant, and the structural formula of this extractant is as follows: .

[0027] In a second aspect, this application provides a method for purifying cyanide-containing copper wastewater with an extractant. The extraction is carried out using the aforementioned extractant, and it includes the following steps: S1. Mix and dissolve the extractant with a diluent to obtain an extractant diluent; Among them, the diluent is sulfonated kerosene. In the extractant diluent, the volume ratio of the extractant to the diluent is 1:(10 - 100).

[0028] S2. Add the extractant diluent to the copper-containing cyanide alkaline solution to achieve selective extraction of copper in the cyanide solution.

[0029] Among them, in step S2, sodium hydroxide is used to adjust the pH range of the copper-containing cyanide alkaline solution to 9 - 11.

[0030] Copper exists in the solution in the form of [Cu(CN) 2 - , [Cu(CN) 3 2- , [Cu(CN) 4 3- .

[0031] The concentration range of free cyanide in the copper-containing cyanide alkaline solution is 100 mg / L - 1000 mg / L, and the concentration range of total cyanide is 100 mg / L - 2000 mg / L.

[0032] The volume ratio of the extractant diluent to the copper-containing cyanide alkaline solution is 1:(1 - 10).​​​

[0033] In the technical solution of the embodiment of the present application, the extractant has an imidazole ring as the molecular backbone. Through quaternization reaction, aliphatic chain functional groups are introduced to adjust the hydrophobic property of the extractant, ensuring that the extractant is insoluble in the inorganic aqueous phase. By derivatizing the amino group to form a thioester group, the terminal mercapto group hydrolyzes under alkaline conditions to form S - activation sites, which can effectively bond with cuprous ions (Ⅰ). At the same time, S - the activation sites and the lone pair electrons on the adjacent N atom cooperate with each other to chelate cuprous ions (Ⅰ) to the greatest extent, ensuring that the cuprous ions exist in the form of chelates and will not be further converted into the free state. Moreover, the lone pair electrons on the N atom and the carboxyl group can cooperate with each other to achieve targeted chelation of cupric ions (Ⅱ) in the solution. At the same time, the steric effect of the thioester group results in the final chelation product existing in the trans form, and this spatial orientation greatly improves the stability of the copper chelate, which is beneficial to the conversion of cupric ions (Ⅱ) from the inorganic interface to the organic interface during the extraction process, realizing the efficient extraction of copper in the cyanide-containing wastewater and achieving the purpose of purifying the copper-containing cyanide wastewater.

[0034] In the technical solution of the embodiment of the present application, by using a specific extractant, copper in the solution is selectively extracted. After the extraction is completed, the organic phase is separated, and the concentration of copper in the inorganic liquid phase solution is detected and the extraction rate is calculated. This method can selectively extract copper in the solution, reduce the interference of other impurities, and improve the purity of copper. By recovering valuable metals from the wastewater, environmental pollution is reduced, which is beneficial to realizing sustainable development. This method has simple steps and is easy to operate, which is beneficial to popularization and application in actual production.

[0035] The copper-containing cyanide wastewater is one or more of the copper-containing cyanide waste liquid remaining after the activated carbon adsorption of the cyanide gold extraction solution, the copper-containing cyanide waste liquid remaining after the ion exchange resin adsorption of the cyanide gold extraction solution, the copper-containing cyanide electroplating waste liquid, and the copper plating rinse wastewater.

[0036] In the technical solution of the embodiment of the present application, the extractant can effectively extract copper from different types of wastewater, while ensuring the environmental protection, safety and economic benefits of the process.

[0037] The following lists some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain the present application, and should not be construed as a limitation to the present application. For those without specific techniques or conditions noted in the embodiments, the techniques or conditions described in the literature in the field or according to the product specifications are followed. For reagents or instruments without indicating the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0038] Example 1 This embodiment provides an extractant, and the structural formula of the extractant is as follows: 。

[0039] The synthesis route diagram of the extractant is as Figure 1 shown, and specifically includes the following steps: A1. Add 1 mol of histidine (A) and 0.6 mol of copper chloride to 5 L of deionized water at 60 °C, adjust the pH of the solution to 9 with sodium hydroxide, maintain the temperature at 60 °C, and stir for 24 h. Evaporate the solution to a volume of 1 L, filter, and collect the solid. Add the collected solid to 5 L of ethanol solution, heat to 40 °C, stir and dissolve for 36 h, collect the solution phase, and perform vacuum distillation to collect the precipitated bright blue scaly solid (B), with a yield of 18 - 20%.

[0040] A2. Add 0.5 mol of B and 0.7 mol of 1-bromobutane to 1 L of absolute ethanol, add an appropriate amount of sodium hydroxide, and the concentration of sodium hydroxide is 0.1 mol / L. Under the condition of 80 °C, reflux and react for 36 h. After the reaction is completed, use vacuum distillation to remove the solvent ethanol and excess 1-bromobutane, collect the solid (C), add saturated ammonia water, dissolve it by ultrasonic treatment, filter, and remove copper hydroxide. Then add deionized water, dissolve it by ultrasonic treatment, and filter and wash until it is weakly alkaline or neutral. Since the subsequent reaction needs to be carried out under alkaline conditions, it is not necessary to wash repeatedly. Since the product of step A2 contains part of sodium hydroxide, the cumulative yield is calculated together with the subsequent step A3.

[0041] A3. Add the product of step A2 to an excess of CS 2 solution, the mass concentration of the solid CS 2 solution is 400 g / L, add sodium hydroxide, and the mass concentration of sodium hydroxide and CS 2 solution is 100 g / L. Heat to 40 °C to reflux and react for 3 h. After the reaction is completed, perform vacuum distillation on the solution to remove the excess carbon disulfide. Use dilute hydrochloric acid (V 盐酸 : V 去离子水 = 1:10) to adjust the pH of the residual solution to neutral, and perform vacuum rotary evaporation at 70 °C in a water bath until all the liquid evaporates to obtain a bright yellow oily compound, product D, that is, the extractant, with a yield of 72 - 76%. Its physical diagram is as Figure 2 shown.

[0042] Since the thioester group in the extractant of Example 1 is unstable under neutral and acidic conditions, a small amount of sodium hydroxide solution needs to be added to adjust it to alkaline (pH = 10) before analysis can be carried out. The nuclear magnetic resonance hydrogen spectrum of the extractant obtained in Example 1 under alkaline conditions (pH = 10) is as Figure 3 shown.

[0043] Dissolve the extractant prepared in Example 1 in the deuterated solvent D 2Nuclear magnetic resonance hydrogen spectrum test was carried out in O, and the test results are as Figure 3 shown in (a) of. It can be seen that the peak intensity of the deuterated solvent is much higher than that of the extractant, indicating that the solubility of the extractant in the aqueous phase is limited under alkaline conditions, which is beneficial to avoiding the residue of the extractant in the aqueous phase and preventing secondary pollution of the water body.

[0044] The range of the chemical shift of nuclear magnetic resonance hydrogen spectrum from 0.5 to 4 ppm was magnified, as shown in Figure 3 (b) of. It can be seen that 1HNMR (D 2 O, 400MHZ): δ8.50 (H, thioamide N-H), δ6.80 - 7.50 (2H, imidazole ring H), δ2.75~2.85(4H, -CH 2 -CH 2 -), δ2.90~3.20 (4H, substituents -CH at positions 1 and 4 of the imidazole ring 2 -fragment), δ3.70 (1H, -CH).

[0045] Example 2 This example provides a method for purifying copper cyanide-containing wastewater with an extractant. The extractant used is the extractant prepared in Example 1; the specific steps are as follows: S1. Mix the extractant with sulfonated kerosene at a volume ratio of 1:10 and dissolve it by ultrasonic treatment to obtain a diluted extractant solution.

[0046] S2. Adjust the pH of the copper-containing cyanide solution to 11 with sodium hydroxide; At room temperature, take 10 ml of the diluted extractant solution in step S1 and add it to 50 mL of copper cyanide-containing electroplating wastewater with a copper ion concentration of 100 ppm. In a water bath oscillator at 25 °C, after shaking for 5 min, separate the organic phase, and detect the copper concentration in the inorganic liquid phase solution by ICP-OES, so as to calculate the extraction rate of copper in the solution by the extractant.

[0047] Examples 3 - 4 and Comparative Examples 1 - 6 Examples 3 - 4 and Comparative Examples 1 - 6 respectively provide a method for purifying copper cyanide-containing wastewater with an extractant. Compared with Example 2, the only difference is that the pH value of the wastewater is different (adjust the pH value to a predetermined value with sodium hydroxide or hydrochloric acid), as shown in Table 1. Other experimental parameters and conditions are basically the same as those in Example 2 and will not be elaborated here.

[0048] Table 1 pH values and extraction effects of Examples 2 - 4 and Comparative Examples 1 - 6 — represents below the detection limit of ICP-OES.

[0049] As can be seen from Table 1, the extractant prepared in Example 1 has high extraction ability for copper in the copper-containing cyanide waste liquid within a specific pH range (9 - 11), and the extraction effect reaches over 96.0%. When the pH is greater than or equal to 12, part of the copper in the liquid phase precipitates and separates from the inorganic solution system, unable to undergo mass transfer reaction with the organic solution phase, resulting in the inability to extract the precipitated copper and ultimately reducing the extraction effect. When the pH rises to 14, most of the copper exists in the form of precipitate (copper hydroxide). The solubility of copper hydroxide is relatively low, and there is only a small amount of copper hydroxide in the aqueous phase. The copper hydroxide dissolved in the aqueous phase is extracted by the extractant, and the final extraction rate is only 3%.

[0050] It can be seen that when the pH is 8, the carboxyl group of the active site in the extractant is not activated, and the leaching effect of copper is limited, only 43.1%. When the pH is less than or equal to 7, the extractant exists in the form of neutral molecules or protons, and the active sites S - and the carboxyl group are not activated and cannot bond with copper ions, resulting in the inability to extract copper.

[0051] Examples 5 - 12 In Examples 5 - 12, experiments were carried out to extract and separate copper from the mixed ion solution (a solution with multiple coexisting ions) using the extractant prepared in Example 1. The main difference among Examples 5 - 12 lies in the different metal ion concentrations in the solution to be treated. The specific operation steps are as follows: A series of cyanide-blended solutions containing different concentration ratios of copper to gold, silver, arsenic, and iron were prepared, and the pH of the cyanide-blended solution was 10 (when the pH is 11, part of the arsenic precipitates, so the pH was selected as 10).

[0052] The extractant prepared in Example 1 was mixed with sulfonated kerosene at a volume ratio of 1:10 and ultrasonically dissolved to obtain a diluted extractant solution; 10 ml of the diluted extractant solution was added to 50 mL of the solution to be treated with different concentrations respectively. After shaking for 20 min, the inorganic liquid phase was taken, and the concentrations of various metal ions in the inorganic liquid phase solution were detected by ICP - OES to calculate the extraction rate.

[0053] The extraction effects of the extractant prepared in Example 1 on various metal ions in the blended solution are shown in Table 2.

[0054] Table 2 Extraction ability of the extractant for various metal ions in the mixed ion solution — represents below the detection limit of ICP - OES.

[0055] As can be seen from Table 2, the extractant has a selective extraction effect on copper in the cyanide waste liquid, and does not extract gold, silver, and arsenic ions. It will extract a small amount of iron ions, and the extraction rate is less than 13%. The main reason is that some divalent iron forms stable ferrocyanide ions with cyanide, and the stability of ferrocyanide ions is at the same order of magnitude as the chelation product of ferrous ions and the extractant. Furthermore, some ferrocyanide ions undergo an ion exchange reaction with the extractant, resulting in a small amount of co-extraction.

[0056] Examples 13 - 16 and Comparative Examples 7 - 8 Examples 13 - 16 and Comparative Examples 7 - 8 were used to conduct experiments on extracting copper from copper-containing solutions with different cyanide concentrations using the extractant prepared in Example 1. The main difference between Examples 13 - 16 and Comparative Examples 7 - 8 is the different cyanide concentrations in the solution to be treated. The specific operation steps are as follows: A series of copper-containing solutions with different cyanide concentrations were prepared, with the cyanide concentration based on the total cyanide concentration. Among them, the concentration of copper analyzed by ICP - OES was 25 mg / L, and the pH of the cyanide solution was 10.

[0057] The extractant prepared in Example 1 was mixed with sulfonated kerosene at a volume ratio of 1:10 and dissolved by ultrasonic treatment to obtain a diluted extractant solution; 100 ml of the diluted extractant solution was respectively added to 50 mL of the solution to be treated with different cyanide concentrations. After shaking for 20 min, the inorganic liquid phase was taken, and the concentration of copper ions in the inorganic liquid phase solution was detected by ICP - OES to calculate the extraction rate.

[0058] The extraction effect of the extractant prepared in Example 1 on copper-containing solutions with different cyanide concentrations is shown in Table 3.

[0059] Table 3 Extraction ability of the extractant for copper in copper-containing solutions with different cyanide concentrations As can be seen from Table 3, the extractant has a good extraction effect on copper in cyanide waste liquid with a cyanide concentration of 100 - 2000 mg / L, and the extraction rate is greater than 90%. When the cyanide concentration is greater than 2000 mg / L, the extraction rate of copper drops below 90%. The main reason is that the reaction of cyanide with the extractant to extract copper by ion exchange is essentially a competitive chelation / complexation reaction, and the concentrations of the two substances have a direct impact on the direction of the competitive reaction. The main reason for not conducting comparative experiments with a cyanide concentration less than 100 mg / L is that the amount of cyanide cannot fully meet the theoretical value required by copper ions in the copper ion system with complex valence states, and some excess copper ions will exist in the form of precipitation, interfering with the experiment.

[0060] The cyanide-containing copper wastewater can be one or more of the residual copper-containing cyanide waste liquid adsorbed by activated carbon from the cyanide gold extraction solution, the residual copper-containing cyanide waste liquid adsorbed by ion exchange resin from the cyanide gold extraction solution, copper-containing cyanide electroplating waste liquid, and copper plating rinsing wastewater.

[0061] It should be noted that this application is not limited to the above embodiments. The above embodiments are only examples, and embodiments with the same structure and the same effect within the technical scope of this application are included in the technical scope of this application. In addition, within the scope of not departing from the main idea of this application, various modifications that can be thought of by those skilled in the art to the embodiments, and other ways constructed by combining some of the components in the embodiments are also included in the scope of this application.

Claims

1. An extractant, characterized in that The structural formula of the extractant is as follows: 。 2. A method for purifying cyanide copper-containing wastewater using an extractant, wherein the extractant according to claim 1 is used for extraction, characterized in that: The following steps are involved: S1, mixing and dissolving an extractant and a diluent to obtain an extractant dilution solution; S2, adding the extractant diluent to the copper-containing cyanide alkaline solution to achieve selective extraction of copper in the cyanide solution.

3. The method for purifying cyanide copper-containing wastewater using an extractant according to claim 2, characterized in that: The pH range of the copper-containing cyanide alkaline solution is 9-11.

4. The method for purifying cyanide copper-containing wastewater using an extractant according to claim 2, characterized in that: The diluent is sulfonated kerosene.

5. The method for purifying cyanide copper-containing wastewater using an extractant according to claim 2, characterized in that: Copper in solution is [Cu(CN)2] - , [Cu(CN)3] 2- , [Cu(CN)4] 3- Form exists.

6. The method for purifying cyanide copper-containing wastewater using an extractant according to claim 2, characterized in that: In the extractant diluent, the volume ratio of the extractant to the diluent is 1:(10-100).

7. The method for purifying cyanide copper-containing wastewater using an extractant according to claim 2, characterized in that: The concentration of free cyanide in the copper-containing cyanide alkaline solution is in the range of 100 mg / L-1000 mg / L, and the concentration of total cyanide is in the range of 100 mg / L-2000 mg / L.

8. The method for purifying cyanide copper-containing wastewater using an extractant according to claim 2, characterized in that: The cyanide copper-containing wastewater is one or more of the following: residual copper-containing cyanide waste liquid adsorbed by activated carbon in cyanide gold extraction solution, residual copper-containing cyanide waste liquid adsorbed by ion exchange resin in cyanide gold extraction solution, copper-containing cyanide electroplating waste liquid, and copper plating rinsing wastewater.

9. The method for purifying cyanide copper-containing wastewater using an extractant according to claim 2, characterized in that: The volume ratio of the extractant diluent to the copper-containing cyanide alkaline solution is 1:(1-10).

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