A method for preparing a high-concentration cyanide wastewater treatment agent

Abstract

This invention discloses a method for preparing a high-concentration cyanide wastewater treatment agent. The method includes the following steps: mixing coal gangue and tourmaline, crushing and grinding the mixture, and passing it through a sieve of 1000 mesh or higher to obtain a coal gangue / tourmaline mixed powder; dissolving polyacrylamide in water to obtain a polyacrylamide solution with a concentration of 3-8 wt%; then ultrasonically dispersing the obtained coal gangue / tourmaline mixed powder in the polyacrylamide solution to obtain a suspension; adding a cationic monomer and an initiator to the obtained suspension to carry out a polymerization reaction to obtain copolymer I; adding polylactic acid-glycolic acid copolymer microspheres and a crosslinking agent to the obtained copolymer I, stirring the reaction, and after the reaction is completed, washing and drying the product to obtain the high-concentration cyanide wastewater treatment agent. The treatment agent of this invention can effectively remove high-concentration cyanide.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and more specifically, relates to a method for preparing a high-concentration cyanide wastewater treatment agent. Background Technology

[0002] Cyanide refers to compounds whose molecules contain a cyanide group (CN). - Substances containing cyanide generally include: 1) inorganic cyanides containing cyanide ions, such as HCN and NaCN; 2) complexed cyanides that are abundant in cyanide-containing wastewater, such as Zn(CN)2. 2- Cu(CN)2 - 3) Organic cyanides with a cyano group (-CN) as the functional group are called nitriles. They can be considered as compounds in which the hydrogen atoms in an HCN molecule are replaced by hydrocarbon groups.

[0003] Cyanides are widely used in industrial production. The cyanide ion (CN) - Cyanide reacts with heavy metal ions to form complexes. Therefore, cyanide is an essential chemical raw material in ammonia synthesis, coking plants, hydrometallurgy, and electroplating. It is also frequently used in mining, jewelry, steel and metal industries, chemical production, and food processing. Because the cyanide ions (CN-) precipitated from cyanide in solution are highly toxic and can harm the vital signs of organisms, cyanide is classified as a highly toxic substance. It cannot be directly discharged into natural water bodies, nor can it be degraded using traditional biological treatment technologies.

[0004] Currently, the treatment processes for cyanide-containing wastewater are divided into oxidation, precipitation, and recovery methods. Oxidation methods are the most widely used, including sulfur dioxide air oxidation, chlor-alkali oxidation, ozone oxidation, electrolysis, and hydrogen peroxide oxidation. Oxidation methods generally suffer from high reagent costs, and also introduce other salts, causing secondary pollution. Furthermore, they are ineffective at treating ferrocyanide complexes. Precipitation methods generally cannot completely remove complexed cyanides. Recovery methods typically involve sulfuric acid acidification or the zinc sulfate-sulfuric acid process. Additionally, ion exchange and semi-permeable membrane methods are under research and development. Both ion exchange and semi-permeable membrane methods suffer from high treatment costs. Summary of the Invention

[0005] The primary objective of this invention is to provide a method for preparing a high-concentration cyanide wastewater treatment agent, which can effectively remove high-concentration cyanide.

[0006] Therefore, the present invention provides the following technical solution.

[0007] One aspect of the present invention provides a method for preparing a high-concentration cyanide wastewater treatment agent, the method comprising the following steps:

[0008] Coal gangue and tourmaline are mixed, crushed, ground, and passed through a sieve of 1000 mesh or higher to obtain coal gangue / tourmaline mixed powder;

[0009] Polyacrylamide is dissolved in water to obtain a polyacrylamide solution with a concentration of 3-8 wt%. Then, the obtained coal gangue / tourmaline mixed powder is ultrasonically dispersed in the polyacrylamide solution to obtain a suspension.

[0010] The obtained suspension was added with cationic monomer and initiator to carry out a polymerization reaction to obtain copolymer I;

[0011] Polylactic acid-glycolic acid copolymer microspheres and a crosslinking agent were added to the obtained copolymer I, and the mixture was stirred and reacted. After the reaction was completed, the product was washed and dried to obtain the high-concentration cyanide wastewater treatment agent.

[0012] In a preferred embodiment of the present invention, the coal gangue and tourmaline are mixed in a mass ratio of 1:1 to 3.

[0013] In a preferred embodiment of the present invention, the tourmaline is selected from one of the following: Bouguer tourmaline, magnesium tourmaline, iron tourmaline, lithium tourmaline, iron-magnesium tourmaline, calcium-magnesium tourmaline, black tourmaline, and calcium-lithium tourmaline.

[0014] In a preferred embodiment of the present invention, the coal gangue / tourmaline mixed powder is added at a mass-to-volume ratio of 1g to 100-300mL with the polyacrylamide solution.

[0015] In a preferred embodiment of the present invention, the cationic monomer is selected from any one of 2-ethylhexyl (meth)acrylate, isobornyl (meth)acrylate, lauryl (meth)acrylate, allyl (meth)acrylate, and stearyl (meth)acrylate.

[0016] In a preferred embodiment of the present invention, the amount of the cationic monomer added is 1 to 3 times the mass of the polyacrylamide.

[0017] In a preferred embodiment of the present invention, the initiator is selected from any one of sodium persulfate, potassium persulfate, and ammonium persulfate.

[0018] In a preferred embodiment of the present invention, the amount of the initiator added is 0.5 to 1% of the mass of the cationic monomer.

[0019] In a preferred embodiment of the present invention, the polylactic acid-glycolic acid copolymer microspheres have an average particle size of 1–10 μm and an average molecular weight of 1 × 10⁻⁶. 4 ~1×10 10 It is polymerized from lactic acid and glycolic acid in a molar ratio of 1:1 to 3.

[0020] In a preferred embodiment of the present invention, the amount of polylactic acid-hydroxyacetic acid copolymer microspheres added is 0.5 to 1 times the mass of copolymer I.

[0021] In a preferred embodiment of the present invention, the crosslinking agent is selected from any one of catechol, hydroquinone, resorcinol, and glutaraldehyde.

[0022] In a preferred embodiment of the present invention, the amount of crosslinking agent added is 0.1 to 0.15 times the mass of copolymer I.

[0023] In a preferred embodiment of the present invention, the stirring reaction conditions are: temperature 40-60°C, time 4-10h.

[0024] By employing the above technical solution, the present invention has at least the following advantages:

[0025] This invention uses coal gangue and tourmaline as raw materials. Based on the various metal cations contained in coal gangue and tourmaline, the mixture of coal gangue and tourmaline possesses the function of complexing cyanide ions. Furthermore, polyacrylamide-grafted cationic monomers are used to coat the coal gangue and tourmaline powders. This not only provides the product with a large amount of positive charge but also prevents the leaching of metal ions from the coal gangue and tourmaline, thereby avoiding heavy metal pollution to water bodies. Finally, by adding polylactic acid-glycolic acid copolymer microspheres and cross-linking polymerization under the action of a cross-linking agent, the treatment agent acquires a porous structure and a three-dimensional network structure. This allows the final product to not only complex cyanide but also adsorb it, effectively reducing cyanide in wastewater.

[0026] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below. Detailed Implementation

[0027] To make the technical means, creative features, achieved objectives, and effects of this invention readily understandable, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0028] Unless otherwise specified, the percentage content mentioned in this invention refers to mass percentage for solid-liquid mixtures and solid-phase-solid mixtures, and volume percentage for liquid-phase-liquid mixtures.

[0029] Unless otherwise specified, all percentage concentrations mentioned in this invention refer to the final concentration. The final concentration refers to the proportion of the added component in the system after the addition of that component.

[0030] Unless otherwise specified, the temperature parameters in this invention can be either constant temperature processing or processing within a certain temperature range. The constant temperature processing allows temperature fluctuations within the precision range controlled by the instrument.

[0031] Unless otherwise specified, the experimental methods used in the following examples are all conventional methods.

[0032] Unless otherwise specified, the coal gangue used in the following examples was sourced from a coal mine in Datong, Shanxi Province; the polylactic acid-glycolic acid copolymer microspheres had an average particle size of 1–10 μm and an average molecular weight of 1 × 10⁻⁶. 4 ~1×10 10 It is polymerized from lactic acid and glycolic acid in a molar ratio of 1:2; other materials and reagents are available commercially.

[0033] Example 1:

[0034] A method for preparing a high-concentration cyanide wastewater treatment agent includes the following steps:

[0035] Coal gangue and iron-magnesium tourmaline were mixed in a mass ratio of 1:2, then crushed, ground, and passed through a 1000-mesh sieve to obtain a coal gangue / iron-magnesium tourmaline mixed powder. Polyacrylamide was dissolved in water to obtain a 5.5 wt% polyacrylamide solution. Then, the obtained coal gangue / iron-magnesium tourmaline mixed powder was ultrasonically dispersed in the polyacrylamide solution at a mass-to-volume ratio of 1 g: 200 mL to obtain a suspension.

[0036] The obtained suspension was mixed with 2-ethylhexyl (meth)acrylate (twice the mass of polyacrylamide) and ammonium persulfate (0.75% of the mass of 2-ethylhexyl (meth)acrylate) to carry out a polymerization reaction, yielding copolymer I.

[0037] Polylactic acid-glycolic acid copolymer microspheres (0.75 times the mass of copolymer I) and catechol (0.125 times the mass of copolymer I) were added to the obtained copolymer I, and the mixture was stirred at 50°C for 7 hours. After the reaction was completed, the product was washed and dried to obtain the high-concentration cyanide wastewater treatment agent.

[0038] Example 2:

[0039] A method for preparing a high-concentration cyanide wastewater treatment agent includes the following steps:

[0040] Coal gangue and iron-magnesium tourmaline were mixed in a mass ratio of 1:3, then crushed, ground, and passed through a 1000-mesh sieve to obtain a coal gangue / iron-magnesium tourmaline mixed powder. Polyacrylamide was dissolved in water to obtain a 3wt% polyacrylamide solution. The obtained coal gangue / iron-magnesium tourmaline mixed powder was then ultrasonically dispersed in the polyacrylamide solution at a mass-volume ratio of 1g:300mL to obtain a suspension.

[0041] The obtained suspension was mixed with isoborneol methacrylate (3 times the mass of polyacrylamide) and ammonium persulfate (0.5% of the mass of isoborneol methacrylate) to carry out a polymerization reaction, yielding copolymer I.

[0042] Polylactic acid-glycolic acid copolymer microspheres (addition amount is 1 times the mass of copolymer I) and catechol (addition amount is 0.15 times the mass of copolymer I) were added to the obtained copolymer I, and the mixture was stirred at 50°C for 7 hours. After the reaction was completed, the product was washed and dried to obtain the high-concentration cyanide wastewater treatment agent.

[0043] Example 3:

[0044] A method for preparing a high-concentration cyanide wastewater treatment agent includes the following steps:

[0045] Coal gangue and iron-magnesium tourmaline were mixed in a 1:1 mass ratio, crushed, ground, and passed through a 1000-mesh sieve to obtain a coal gangue / iron-magnesium tourmaline mixed powder. Polyacrylamide was dissolved in water to obtain an 8 wt% polyacrylamide solution. Then, the obtained coal gangue / iron-magnesium tourmaline mixed powder was ultrasonically dispersed in the polyacrylamide solution at a mass-to-volume ratio of 1 g:100 mL to obtain a suspension.

[0046] The obtained suspension was mixed with lauryl methacrylate (1 times the mass of polyacrylamide) and sodium persulfate (1% of the mass of lauryl methacrylate) to carry out a polymerization reaction, yielding copolymer I.

[0047] Polylactic acid-glycolic acid copolymer microspheres (0.5 times the mass of copolymer I) and hydroquinone (0.15 times the mass of copolymer I) were added to the obtained copolymer I, and the mixture was stirred at 50°C for 7 hours. After the reaction was completed, the product was washed and dried to obtain the high-concentration cyanide wastewater treatment agent.

[0048] Example 4:

[0049] A method for preparing a high-concentration cyanide wastewater treatment agent includes the following steps:

[0050] Coal gangue and calcium-magnesium tourmaline were mixed in a mass ratio of 1:2, then crushed, ground, and passed through a 1000-mesh sieve to obtain a coal gangue / calcium-magnesium tourmaline mixed powder. Polyacrylamide was dissolved in water to obtain a 4 wt% polyacrylamide solution. The obtained coal gangue / calcium-magnesium tourmaline mixed powder was then ultrasonically dispersed in the polyacrylamide solution at a mass-to-volume ratio of 1 g: 250 mL to obtain a suspension.

[0051] The obtained suspension was mixed with allyl methacrylate (twice the mass of polyacrylamide) and sodium persulfate (0.6% of the mass of allyl methacrylate) to carry out a polymerization reaction, yielding copolymer I.

[0052] Polylactic acid-glycolic acid copolymer microspheres (0.9 times the mass of copolymer I) and hydroquinone (0.14 times the mass of copolymer I) were added to the obtained copolymer I, and the mixture was stirred at 50°C for 7 hours. After the reaction was completed, the product was washed and dried to obtain the high-concentration cyanide wastewater treatment agent.

[0053] Example 5:

[0054] A method for preparing a high-concentration cyanide wastewater treatment agent includes the following steps:

[0055] Coal gangue and calcium-magnesium tourmaline were mixed in a mass ratio of 1:3, then crushed, ground, and passed through a 1000-mesh sieve to obtain a coal gangue / calcium-magnesium tourmaline mixed powder. Polyacrylamide was dissolved in water to obtain a 7 wt% polyacrylamide solution. The obtained coal gangue / calcium-magnesium tourmaline mixed powder was then ultrasonically dispersed in the polyacrylamide solution at a mass-to-volume ratio of 1 g:150 mL to obtain a suspension.

[0056] Add (meth)stearyl acrylate (3 times the mass of polyacrylamide) and potassium persulfate (0.9% of the mass of (meth)stearyl acrylate) to the obtained suspension to carry out a polymerization reaction to obtain copolymer I.

[0057] Polylactic acid-glycolic acid copolymer microspheres (0.6 times the mass of copolymer I) and resorcinol (0.12 times the mass of copolymer I) were added to the obtained copolymer I, and the mixture was stirred at 50°C for 7 hours. After the reaction was completed, the product was washed and dried to obtain the high-concentration cyanide wastewater treatment agent.

[0058] Example 6:

[0059] A method for preparing a high-concentration cyanide wastewater treatment agent includes the following steps:

[0060] Coal gangue and calcium-magnesium tourmaline were mixed in a 1:1 mass ratio, crushed, ground, and passed through a 1000-mesh sieve to obtain a coal gangue / calcium-magnesium tourmaline mixed powder. Polyacrylamide was dissolved in water to obtain a 5 wt% polyacrylamide solution. Then, the obtained coal gangue / calcium-magnesium tourmaline mixed powder was ultrasonically dispersed in the polyacrylamide solution at a mass-to-volume ratio of 1 g: 200 mL to obtain a suspension.

[0061] The obtained suspension was mixed with cationic monomer (1 times the mass of polyacrylamide) and potassium persulfate (0.8% of the mass of cationic monomer) to carry out a polymerization reaction, yielding copolymer I.

[0062] Polylactic acid-glycolic acid copolymer microspheres (0.8 times the mass of copolymer I) and glutaraldehyde (0.13 times the mass of copolymer I) were added to the obtained copolymer I, and the mixture was stirred at 50°C for 7 hours. After the reaction was completed, the product was washed and dried to obtain the high-concentration cyanide wastewater treatment agent.

[0063] Comparative Example 1:

[0064] A method for preparing a high-concentration cyanide wastewater treatment agent includes the following steps:

[0065] Polyacrylamide was dissolved in water to obtain a 5.5 wt% polyacrylamide solution. Then, 2-ethylhexyl (meth)acrylate (twice the mass of polyacrylamide) and ammonium persulfate (0.75% of the mass of 2-ethylhexyl (meth)acrylate) were added to carry out a polymerization reaction to obtain copolymer I.

[0066] Polylactic acid-glycolic acid copolymer microspheres (0.75 times the mass of copolymer I) and catechol (0.125 times the mass of copolymer I) were added to the obtained copolymer I, and the mixture was stirred at 50°C for 7 hours. After the reaction was completed, the product was washed and dried to obtain the high-concentration cyanide wastewater treatment agent.

[0067] Comparative Example 2:

[0068] A method for preparing a high-concentration cyanide wastewater treatment agent includes the following steps:

[0069] Coal gangue and iron-magnesium tourmaline were mixed in a mass ratio of 1:2, then crushed, ground, and passed through a 1000-mesh sieve to obtain a coal gangue / iron-magnesium tourmaline mixed powder. Polyacrylamide was dissolved in water to obtain a 5.5 wt% polyacrylamide solution. Then, the obtained coal gangue / iron-magnesium tourmaline mixed powder was ultrasonically dispersed in the polyacrylamide solution at a mass-to-volume ratio of 1 g: 200 mL to obtain a suspension.

[0070] The obtained suspension was mixed with 2-ethylhexyl (meth)acrylate (twice the mass of polyacrylamide) and ammonium persulfate (0.75% of the mass of 2-ethylhexyl (meth)acrylate) to produce copolymer I, which was used as a treatment agent for high-concentration cyanide wastewater.

[0071] Comparative Example 3:

[0072] A method for preparing a high-concentration cyanide wastewater treatment agent includes the following steps:

[0073] Coal gangue and iron-magnesium tourmaline were mixed in a mass ratio of 1:2, crushed, ground, and passed through a 1000-mesh sieve to obtain coal gangue / iron-magnesium tourmaline mixed powder, which was used as a treatment agent for high-concentration cyanide wastewater.

[0074] Comparative Example 4:

[0075] A method for preparing a high-concentration cyanide wastewater treatment agent includes the following steps:

[0076] Coal gangue and iron-magnesium tourmaline were mixed at a mass ratio of 1:0.5, then crushed, ground, and passed through a 1000-mesh sieve to obtain a coal gangue / iron-magnesium tourmaline mixed powder. Polyacrylamide was dissolved in water to obtain a 12wt% polyacrylamide solution. The obtained coal gangue / iron-magnesium tourmaline mixed powder was then ultrasonically dispersed in the polyacrylamide solution at a mass-volume ratio of 1g:400mL to obtain a suspension.

[0077] The obtained suspension was mixed with 2-ethylhexyl (meth)acrylate (twice the mass of polyacrylamide) and ammonium persulfate (0.75% of the mass of 2-ethylhexyl (meth)acrylate) to carry out a polymerization reaction, yielding copolymer I.

[0078] Polylactic acid-glycolic acid copolymer microspheres (twice the mass of copolymer I) and catechol (0.125 times the mass of copolymer I) were added to the obtained copolymer I, and the mixture was stirred at 50°C for 7 hours. After the reaction was completed, the product was washed and dried to obtain the high-concentration cyanide wastewater treatment agent.

[0079] Example 5:

[0080] A method for preparing a high-concentration cyanide wastewater treatment agent includes the following steps:

[0081] Coal gangue and iron-magnesium tourmaline were mixed at a mass ratio of 1:0.5, then crushed, ground, and passed through a 1000-mesh sieve to obtain a coal gangue / iron-magnesium tourmaline mixed powder. Polyacrylamide was dissolved in water to obtain a 1 wt% polyacrylamide solution. The obtained coal gangue / iron-magnesium tourmaline mixed powder was then ultrasonically dispersed in the polyacrylamide solution at a mass-volume ratio of 1 g:50 mL to obtain a suspension.

[0082] The obtained suspension was mixed with 2-ethylhexyl (meth)acrylate (4 times the mass of polyacrylamide) and ammonium persulfate (0.1% of the mass of 2-ethylhexyl (meth)acrylate) to carry out a polymerization reaction, yielding copolymer I.

[0083] Polylactic acid-glycolic acid copolymer microspheres (1.5 times the mass of copolymer I) and catechol (0.125 times the mass of copolymer I) were added to the obtained copolymer I, and the mixture was stirred at 50°C for 7 hours. After the reaction was completed, the product was washed and dried to obtain the high-concentration cyanide wastewater treatment agent.

[0084] Experimental Example: Detection of the Removal Efficacy of Different Cyanide Removal Agents on Cyanide and Metal Ions in Wastewater

[0085] Experimental subjects: Cyanide removal agents of Examples 1-6 and Comparative Examples 1-4.

[0086] Experimental method: The cyanide-containing wastewater used in the experiment was taken from the wastewater discharged by a coking plant in Hebei Province. The total cyanide concentration in the initial wastewater was 1250 mg / L.

[0087] 3. Take 5.5L of the above wastewater and divide it into 11 groups of 500mL each. Add 50mg of the treatment agent of Examples 1-6 and Comparative Examples 1-5 to each group of wastewater. Stir at 400rpm for 10min and let stand for 2h. Then take the supernatant to test the cyanide concentration and calculate the cyanide removal rate.

[0088] Removal rate % = (Initial pollutant concentration - Post-treatment pollutant concentration) / Initial pollutant concentration × 100%.

[0089] Experimental results: see Table 1.

[0090] As can be seen from the results in Table 1, the treatment agents prepared according to the methods of Examples 1-6 of this invention have a significantly higher removal rate of cyanide in wastewater than the treatment agents of Comparative Examples 1-5. This indicates that the cyanide removal agent of this invention has a good cyanide removal effect, thereby achieving the purpose of improving water quality.

[0091] Table 1. Removal rate of cyanide by different treatment agents

[0092]

[0093]

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the methods and techniques disclosed above without departing from the scope of the present invention to create equivalent embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for producing a high-concentration cyanide wastewater treatment agent, characterized by, The method comprises the following steps: mixing coal gangue and tourmaline, crushing, grinding, and passing through a 1000-mesh sieve to obtain a coal gangue / tourmaline mixed powder; polyacrylamide is dissolved in water to obtain a polyacrylamide solution with a concentration of 3-8 wt%, and then the obtained coal gangue / tourmaline mixed powder is ultrasonically dispersed in the polyacrylamide solution to obtain a suspension; a cationic monomer and an initiator are added to the obtained suspension to perform a polymerization reaction to obtain a copolymer I; poly(lactic-co-glycolic acid) microspheres and a crosslinking agent are added to the obtained copolymer I, and a stirring reaction is performed, and after the reaction is completed, the product is washed and dried to obtain the high-concentration cyanide wastewater treatment agent; the cationic monomer is selected from any one of 2-ethylhexyl (meth)acrylate, isobornyl (meth)acrylate, lauryl (meth)acrylate, allyl (meth)acrylate, and stearyl (meth)acrylate; the initiator is selected from any one of sodium persulfate, potassium persulfate, and ammonium persulfate; The polylactic acid-glycolic acid copolymer microspheres have an average particle size of 1-10 μm and an average molecular weight of 1×105-1×107. 4 10 The polylactic acid-glycolic acid copolymer is polymerized from lactic acid and glycolic acid in a molar ratio of 1:1-3.​ the crosslinking agent is selected from any one of catechol, hydroquinone, resorcinol, and glutaraldehyde.

2. The method of producing a high concentration cyanide wastewater treatment agent according to claim 1, characterized by, The coal gangue and tourmaline are mixed in a mass ratio of 1:1-3.

3. The method of producing a high-concentration cyanide wastewater treatment agent according to claim 1 or 2, characterized by, The tourmaline is selected from one of buergerite, magnesium tourmaline, iron tourmaline, lithium tourmaline, iron-magnesium tourmaline, calcium-magnesium tourmaline, black tourmaline, and calcium-lithium tourmaline.

4. The method of producing a high concentration cyanide wastewater treatment agent according to claim 1, characterized by, The coal gangue / tourmaline mixed powder is added in an amount of 1 g:100-300 mL of polyacrylamide solution in mass / volume ratio.

5. The method of producing the high concentration cyanide wastewater treatment agent according to claim 1, characterized by, The cationic monomer is added in an amount of 1-3 times the mass of the polyacrylamide.

6. The method of producing a high concentration cyanide wastewater treatment agent according to claim 1, characterized by, The initiator is added in an amount of 0.5-1% of the mass of the cationic monomer.

7. The method of producing a high concentration cyanide wastewater treatment agent according to claim 1, characterized by, The poly(lactic-co-glycolic acid) is added in an amount of 0.5-1 times the mass of the copolymer I.

8. The method of producing the high concentration cyanide wastewater treatment agent according to claim 1, characterized by, The crosslinking agent is added in an amount of 0.1-0.15 times the mass of the copolymer I.

9. The method of producing the high concentration cyanide wastewater treatment agent according to claim 1, characterized by, The stirring reaction conditions are: a temperature of 40-60℃ and a time of 4-10 h.

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