Cyanide removal particle electrode and preparation method thereof, and method and device for treating high-concentration cyanide-containing wastewater

Abstract

A cyanide removal particle electrode suitable for treating high-concentration cyanide-containing wastewater and completely removing cyanide, a preparation method, and a method and device for treating high-concentration cyanide-containing wastewater. The cyanide removal particle electrode is composed of foam metal, metal salt and adhesive. The method for treating high-concentration cyanide-containing wastewater can perform cyanide-breaking treatment on cyanide-containing wastewater with a cyanide ion concentration of 2000-3000 mg / L. The treatment device includes an ozone-three-dimensional electrolysis main reactor. The main reactor can treat high-concentration cyanide-containing wastewater to meet the standards in a relatively short time. The cyanide removal particle electrode has excellent electrochemical performance, a simple preparation method, can be mass-produced, and has high space utilization. It is filled between the anode and cathode plates of traditional two-dimensional electrolysis to form a third electrode, thereby constructing a cyanide ion removal device with light weight, small footprint, high efficiency and low energy consumption.

Description

Technical Field

[0001] The invention relates to the treatment of high-concentration cyanide-containing wastewater, and in particular to a particle electrode used in the treatment, a preparation method thereof and a treatment device used in the treatment. Background Art

[0002] Cyanide plating is one of the commonly used plating types, mainly used for zinc plating, lead plating, copper plating, silver plating, and gold plating. In addition to the highly toxic free cyanide contained in this type of cyanide-containing wastewater, there are also complex ions such as copper cyanide, chromium cyanide, and silver cyanide, and the cyanide concentration is relatively high. In addition, cyanide is a highly toxic substance. Cyanide will combine with ferricytochrome in organisms to generate cyanide ferricytochrome oxidase and lose the function of transferring oxygen, causing tissue hypoxia in animals. Therefore, the discharge of cyanide-containing wastewater will directly threaten the safety of the surrounding water environment.

[0003] Electrochemical oxidation has the advantages of no secondary pollution, strong controllability, low energy consumption, simple reaction equipment and operation, etc. It is known as an environmentally friendly green technology and is gaining more and more attention. It can achieve the purpose of destroying cyanide by using anode reaction or strong oxidants such as hydroxyl radicals generated on the electrode surface.

[0004] The three-dimensional electrolysis technology is based on the traditional two-dimensional flat electrode. The addition of particle electrodes increases the surface-to-volume ratio of the electrolytic cell. In addition, the small spacing between the filled particle electrodes increases the mass transfer rate of the material, which can improve the current efficiency and processing capacity. The performance of the three-dimensional particle electrode determines the processing efficiency of the three-dimensional electrolysis. At present, there are problems in the application such as short-circuit (because the particle electrodes are too close together and the entire electrode is in a static state, the overall resistance of the particle electrode filled between the anode and the cathode is too small, resulting in the numerous micro-electric fields formed by these particle electrodes being very weak and unable to oxidize the wastewater) and low current efficiency, which affect the processing effect.

[0005] In recent years, research on the treatment of cyanide with ozone has been widely carried out. Ozone can release atomic oxygen in aqueous solution to participate in the reaction, showing strong oxidizing properties and can completely oxidize free cyanide. This method does not add other pollutants in the whole process, has no secondary pollution, and has a small amount of sludge, but it has the disadvantage of high electricity costs. In addition, using ozone alone cannot completely oxidize cyanide. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a cyanide-removing particle electrode which is suitable for treating high-concentration cyanide-containing wastewater and can completely remove cyanide, a preparation method thereof, and a method and device for treating high-concentration cyanide-containing wastewater.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] The cyanide-removing particle electrode of the present invention is characterized in that it is composed of foam metal as a matrix, a metal salt as a catalyst and an adhesive, the adhesive uniformly bonds the metal salt to the surface of the foam metal and the three-dimensional network holes, the foam metal is foam nickel, foam copper or foam titanium; the metal salt is a combination of copper oxide, iron oxide, manganese oxide, zinc oxide, zirconium oxide, cobalt oxide, tin oxide and cerium oxide; the adhesive is polyacrylamide or calcium lignin sulfonate.

[0009] The weight percentages of the foam metal, metal salt and adhesive components are 50%-70%, 25%-40% and 5%-10% respectively.

[0010] The porosity of the three-dimensional network holes of the foam metal reaches 95%-98%, and the particle size of the cyanide removal particle electrode is 5mm-10mm.

[0011] The method for preparing the cyanide removal particle electrode of the present invention is characterized in that the method comprises the following steps:

[0012] Step 1: Pretreatment of foam metal

[0013] 1) Soak the foam metal in 0.5-1 mol / L sodium hydroxide solution for 1-2 hours, filter it and wash it with deionized water until it is neutral;

[0014] 2) ultrasonically clean the cleaned metal foam for 5-10 minutes, filter it and dry it at 105-110°C for 12-24 hours;

[0015] Step 2: Preparation of metal salts

[0016] Cu(NO3)2, Fe(NO3)3, Mn(NO3)2, Zn(NO3)2·6H2O, Zr(NO3)4·5H2O, Co(NO3)2·6H2O, Sn(NO3)4, Ce(NO3)3·6H2O were added into water, and fully dissolved and mixed under the action of a magnetic stirrer to obtain a mixed solution;

[0017] The total mass of Cu(NO3)2, Fe(NO3)3, Mn(NO3)2, Zn(NO3)2·6H2O, Zr(NO3)4·5H2O, Co(NO3)2·6H2O, Sn(NO3)4, and Ce(NO3)3·6H2O is 25%-40% of the mass of the foamed metal;

[0018] Step 3: Dipping

[0019] Add the foamed metal and the metal salt obtained in step 1 and step 2 into a vessel containing polyacrylamide or calcium lignin sulfonate solution and mix for 3-6 hours, and filter to obtain the foamed metal bonded with the metal salt;

[0020] Step 4: Drying

[0021] The foamed metal obtained in the previous step is placed in a drying oven and dried at 85-105°C for 12-24h;

[0022] Step 5: Calcination and activation

[0023] The dried foamed metal obtained in the previous step is placed in a muffle furnace, fired at 550-600°C for 2-4 hours, and cooled to room temperature to obtain a calcined and activated cyanide removal particle electrode.

[0024] In the method for preparing the cyanide removal particle electrode, in the mixed solution,

[0025] The molar ratio of Cu element to Fe element is 0.2-0.5:1;

[0026] The molar ratio of Cu element to Mn element is 0.5-1:1;

[0027] The molar ratio of Cu element to Zn element is 1-4:1;

[0028] The molar ratio of Cu element to Zr element is 2-5:1;

[0029] The molar ratio of Cu element to Co element is 1-5:1;

[0030] The molar ratio of Cu element to Sn element is 15-20:1;

[0031] The molar ratio of Cu element to Ce element is 15-25:1.

[0032] The method for treating high-concentration cyanide-containing wastewater of the present invention comprises the following steps:

[0033] Step 1: Adjust the pH value of the cyanide-containing wastewater solution

[0034] Inject cyanide wastewater with a cyanide ion concentration of 2000-3000 mg / L into the pH adjustment tank to adjust its pH value to 8-10;

[0035] Step 2: Cyanide Destruction

[0036] The cyanide-containing wastewater after pH adjustment is pumped into an ozone-three-dimensional electrolysis device for catalytic electrolysis to destroy cyanide, wherein the cyanide removal particle electrode according to any one of claims 1 to 3 is filled between the anode and the cathode in the ozone-three-dimensional electrolysis device;

[0037] Step 3: Flocculation and precipitation

[0038] After the cyanide ion concentration in the cyanide-containing wastewater stock solution drops to 0.1-0.5 mg / L, the wastewater after the cyanide ions are decomposed is passed into the flocculation tank, and an appropriate amount of flocculant is added for flocculation and precipitation;

[0039] Step 4: Discharge

[0040] The wastewater treated in step 3 is filtered and the qualified filtrate is directly discharged.

[0041] In the method for treating high-concentration cyanide-containing wastewater, the DC voltage applied between the anode and the cathode is 20-50V, and the current density is 40-60mA / cm 2 .

[0042] In the method for treating high-concentration cyanide-containing wastewater, in the ozone-three-dimensional electrolysis device, the mass ratio of the cyanide-removing particle electrode to the cyanide-containing wastewater stock solution is 1:1-1:1.5; the catalytic electrolysis cyanide-destroying reaction time is 60-120 minutes.

[0043] The device for treating high-concentration cyanide-containing wastewater of the present invention comprises a shell, characterized in that: the shell is divided into two upper and lower cavities, the upper cavity is a catalytic electrolysis reaction system, the lower cavity is an ozone aeration system, and a ventilation baffle is provided between the upper cavity and the lower cavity; wherein,

[0044] The catalytic electrolysis reaction system is composed of an anode, a cathode and the cyanide removal particle electrode filled between the anode and the cathode;

[0045] The ozone aeration system consists of an aeration pipe, one end of which passes through the side wall of the shell and is connected to an external ozone generator;

[0046] A water inlet for cyanide-containing wastewater is arranged at the bottom of one side of the shell corresponding to the upper cavity, and an overflow port for discharging cyanide-destroyed wastewater out of the device is arranged at the top of the other side of the shell corresponding to the upper cavity.

[0047] In the device for treating high-concentration cyanide-containing wastewater, the anode is a graphite anode, the cathode is a graphite cathode, and the ozone ventilation volume is controlled at 5-10 g / h.

[0048] The ozone-three-dimensional electrolysis device of the present invention can treat high-concentration cyanide-containing wastewater to meet the standard in a relatively short time. The cyanide removal particle electrode of the present invention has excellent electrochemical performance, a simple preparation method, can be mass-produced, and has high space utilization. It is filled between the anode and cathode plates of the traditional two-dimensional electrolysis to form a third electrode, thereby constructing a cyanide removal device with light weight, small footprint, high efficiency and low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1It is a schematic diagram of the ozone-three-dimensional electrolysis main reactor 1 in the device of the present invention.

[0050] The reference numerals are as follows:

[0051] Ozone-three-dimensional electrolysis main reactor 1, upper cavity 2, lower cavity 3, ventilation baffle 4, cyanide removal particle electrode 5, water inlet 6, overflow port 7, power supply 8, anode 81, cathode 82, shell 9, aeration pipe 91, ozone generator 92. DETAILED DESCRIPTION

[0052] 1. Cyanide removal particle electrode

[0053] The invention provides a novel cyanide removal particle electrode which can effectively remove cyanide ions in industrial wastewater with a cyanide ion concentration of 2000-3000 mg / L (high-concentration cyanide-containing wastewater in the industry).

[0054] The cyanide removal particle electrode is composed of foamed metal, metal salt and adhesive.

[0055] The foam metal is used as the matrix of the cyanide removal particle electrode, and a plurality of three-dimensional network holes are evenly distributed on it. The metal salt is used as a catalyst, and the adhesive evenly fixes the metal salt on the surface of the foam metal and the inner surface of the three-dimensional network holes.

[0056] The foam metal can be foam nickel, foam copper or foam titanium. These foam metals not only have numerous three-dimensional network holes, but also can be produced according to customer needs in terms of the size of the three-dimensional network holes. That is, the size of the three-dimensional network holes can be designed according to demand.

[0057] The metal salt is a combination of copper oxide, iron oxide, manganese oxide, zinc oxide, zirconium oxide, cobalt oxide, tin oxide and cerium oxide.

[0058] The adhesive is polyacrylamide or calcium lignin sulfonate (calcium lignin sulfonate is a multi-component high molecular polymer anionic surfactant with strong dispersibility, adhesion and chelating properties).

[0059] The weight percentages of the foam metal, metal salt and adhesive components in the cyanide removal particle electrode of the present invention are preferably 50%-70%, 25%-40% and 5%-10%. The porosity of the three-dimensional network holes of the foam metal is 95%-98%, and the particle size of the cyanide removal particle electrode is 5mm-10mm.

[0060] The above-mentioned cyanide removal particle electrode loads active components such as metal oxides with catalytic functions on the surface of the foam metal matrix and in the three-dimensional network pores in the matrix, which greatly increases the specific surface area of ​​the catalyst, while also avoiding the loss of active components and extending the service life of the cyanide removal particle electrode.

[0061] 2. Method for making the above-mentioned cyanide removal particle electrode

[0062] Step 1: Pretreatment of foam metal

[0063] 1) Soak the foam metal in a 0.5-1 mol / L sodium hydroxide solution for 1-2 hours to remove dirt on the surface of the foam metal and in the three-dimensional network pores (to facilitate the subsequent bonding of metal oxides), filter and wash with deionized water until neutral;

[0064] 2) Ultrasonic cleaning of the cleaned foam metal for 5-10 minutes to remove fine dirt adhering to the pores of the three-dimensional network, filtering with a 100-300 mesh PP filter cloth, and then drying at 105-110°C for 12-24 hours;

[0065] Step 2: Preparation of metal salts

[0066] Cu(NO3)2, Fe(NO3)3, Mn(NO3)2, Zn(NO3)2·6H2O, Zr(NO3)4·5H2O, Co(NO3)2·6H2O, Sn(NO3)4, Ce(NO3)3·6H2O were added into water, and fully dissolved and mixed under the action of a magnetic stirrer to obtain a mixed solution;

[0067] Wherein, the total mass of Cu(NO3)2, Fe(NO3)3, Mn(NO3)2, Zn(NO3)2·6H2O, Zr(NO3)4·5H2O, Co(NO3)2·6H2O, Sn(NO3)4 and Ce(NO3)3·6H2O is 25%-40% of the mass of the foam metal;

[0068] The molar ratio of Cu element to Fe element is 0.2-0.5:1;

[0069] The molar ratio of Cu element to Mn element is 0.5-1:1;

[0070] The molar ratio of Cu element to Zn element is 1-4:1;

[0071] The molar ratio of Cu element to Zr element is 2-5:1;

[0072] The molar ratio of Cu element to Co element is 1-5:1;

[0073] The molar ratio of Cu element to Sn element is 15-20:1;

[0074] The molar ratio of Cu element to Ce element is 15-25:1.

[0075] Step 3: Dipping

[0076] The foamed metal and metal salt obtained in step 1 and step 2 are added into a vessel containing polyacrylamide or calcium lignin sulfonate solution and mixed for 3-6 hours. The foamed metal bonded with the metal salt is collected by filtration, and the unreacted metal salt solution is removed.

[0077] Step 4: Drying

[0078] The foamed metal obtained in the previous step is placed in a drying oven and dried at 85-105°C for 12-24 hours to tightly combine the metal salt and the foamed metal.

[0079] Step 5: Calcination and activation

[0080] The dried foamed metal obtained in the previous step is placed in a muffle furnace, fired at 550-600°C for 2-4 hours, and cooled to room temperature to obtain a calcined and activated cyanide removal particle electrode.

[0081] 3. Method for treating high-concentration cyanide-containing wastewater of the present invention

[0082] Here are the steps:

[0083] Step 1: Adjust the pH value of the cyanide-containing wastewater solution

[0084] The cyanide-containing wastewater with a cyanide ion concentration of 2000-3000 mg / L is injected into the pH adjustment tank to adjust its pH value to 8-10 to avoid the formation of toxic hydrogen cyanide gas in the cyanide-containing wastewater under acidic conditions.

[0085] Step 2: Cyanide Destruction

[0086] The cyanide-containing wastewater after pH adjustment is pumped into an ozone-three-dimensional electrolysis device (hereinafter also referred to as an electrolysis device) for catalytic electrolysis to destroy cyanide. The anode and cathode in the ozone-three-dimensional electrolysis device are filled with the cyanide removal particle electrode of the present invention.

[0087] During electrolysis, a pulsed DC voltage of 20-50V and a current density of 40-60mA / cm2 are applied between the anode and cathode in the ozone-3D electrolysis device. 2 .

[0088] In the ozone-three-dimensional electrolysis device, the mass ratio of the filled cyanide removal particle electrode to the cyanide-containing wastewater stock solution is 1:1-1:1.5; the catalytic electrolysis cyanide destruction reaction time is 60-120 minutes.

[0089] When the cyanide removal particle electrode is filled in the electrolysis device, the wastewater in the electrolysis device can flow freely between the three-dimensional network holes of the foam metal, which greatly accelerates the convection between the wastewater and the cyanide removal particle electrode, greatly improves the mass transfer efficiency of the wastewater, and highlights the synergistic effect of "large specific surface area + efficient mass transfer efficiency". The electrons generated by the metal oxide carried by the foam metal under the excitation of the electric field oxidize the cyanide ions. At the same time, the ozone introduced as an oxidant can also further oxidize the cyanide ions.

[0090] The above process occurs at the anode as follows:

[0091] CN - +20H - -2e→CNO - +H20

[0092] CNO - +40H - -6e→2C02↑+N2↑+2H20

[0093] The above-mentioned cyanide destruction process can directly oxidize the cyanide ions in the wastewater into carbon dioxide and nitrogen, thereby effectively removing the cyanide ions and greatly improving the removal rate of the cyanide ions.

[0094] Step 3: Flocculation and precipitation

[0095] After the above treatment, the wastewater is sampled for testing. When the cyanide ion concentration in the cyanide-containing wastewater drops to 0.1-0.5 mg / L, it is passed into a flocculation tank, and an appropriate amount of flocculant (the flocculant can be polyacrylamide) is added for flocculation and precipitation, and the cyanide ions in this part of the wastewater are further removed in the form of carbon dioxide and nitrogen.

[0096] Step 4: Discharge

[0097] The wastewater treated in step 3 is filtered and the qualified filtrate is directly discharged.

[0098] 4. Device for treating high-concentration cyanide-containing wastewater of the present invention

[0099] like Figure 1 As shown, the device includes a high-concentration cyanide-containing wastewater collection tank (not shown in the figure), a pH adjustment tank (not shown in the figure), an ozone-three-dimensional electrolysis main reactor 1, a sedimentation tank (not shown in the figure) and a bag filter (not shown in the figure).

[0100] The ozone-three-dimensional electrolysis main reactor 1 (also called the ozone-three-dimensional electrolysis device) is composed of a shell 9 and an ozone aeration system. The shell 9 is divided into two upper and lower cavities, the upper cavity 2 is the cavity where the catalytic electrolysis reaction system is located, and the lower cavity 3 is the cavity where the ozone aeration system is located. A ventilation baffle 4 is provided between the upper cavity 2 and the lower cavity 3.

[0101] 1. The cyanide-containing wastewater collection pool is used to collect the industrial wastewater stock solution containing cyanide ions with a concentration of 2000-3000 mg / L. The water outlet of the collection pool is connected to the water inlet 6 of the pH adjustment pool through a pipeline.

[0102] 2. The water outlet of the pH adjustment tank is connected to the water inlet 6 of the ozone-three-dimensional electrolysis main reactor 1, and a wastewater lifting pump is arranged in the middle.

[0103] 3. The water inlet 6 of the ozone-three-dimensional electrolysis main reactor 1 is arranged at the bottom of one side of the shell 9 corresponding to the upper cavity 2. The cyanide-containing wastewater stock solution enters the upper cavity 2 through the water inlet 6 and flows upward from the bottom of the upper cavity 2. At this time, after the cyanide-containing wastewater stock solution is mixed with the ozone fed from the lower cavity 3, part of the cyanide ions in the wastewater stock solution are oxidized and decomposed. During the electrolysis process of the cyanide-containing wastewater stock solution flowing upward, a sufficient oxidation reaction occurs with the cyanide removal particle electrode 5 filled in the upper cavity 2, further decomposing the undecomposed cyanide ions in the wastewater.

[0104] 4. An overflow port 7 is provided at the top of the other side of the shell 9 corresponding to the upper cavity 2 to discharge the waste water after cyanide destruction out of the device.

[0105] 5. A catalytic electrolysis reaction system, which is composed of an anode 81, a cathode 82 and the cyanide removal particle electrode 5 of the present invention filled between the anode 81 and the cathode 82.

[0106] The anode 81 is a graphite anode 81 , and the cathode 82 is a graphite cathode 82 . The anode 81 and the cathode 82 are connected to the positive and negative electrodes of the external power source 8 , respectively.

[0107] 6. The ozone aeration system is composed of an aeration pipe 91 and an ozone generator 92. One end of the aeration pipe 91 passes through the side wall of the shell 9 and is connected to the external ozone generator 92.

[0108] The ozone ventilation rate is controlled at 5-10 g / h.

[0109] 7. The water outlet of the ozone-three-dimensional electrolysis main reactor is connected to the sedimentation tank.

[0110] 8. The outlet of the sedimentation tank is connected to the bag filter.

Claims

1. A method for treating high-concentration cyanide-containing wastewater, comprising the following steps: Step 1: Adjust the pH value of the cyanide-containing wastewater solution Inject cyanide wastewater with a cyanide ion concentration of 2000-3000 mg / L into the pH adjustment tank to adjust its pH value to 8-10; Step 2: Cyanide Destruction The cyanide-containing wastewater after pH adjustment is pumped into an ozone-three-dimensional electrolysis device for catalytic electrolysis to destroy cyanide, wherein a cyanide removal particle electrode composed of foam metal as a matrix, metal salt as a catalyst and a binder is filled between the anode and the cathode in the ozone-three-dimensional electrolysis device; The porosity of the three-dimensional network holes of the foam metal is 95%-98%, and the particle size of the cyanide removal particle electrode is 5mm-10mm; During electrolysis, 20-50V and a current density of 40-60mA / cm are applied between the anode and cathode in the ozone-3D electrolysis device. 2 The pulsed DC voltage is applied, and the wastewater in the electrolysis device flows between the three-dimensional network holes, accelerating the convection between the wastewater and the cyanide removal particle electrodes, and the introduced ozone further oxidizes the cyanide ions; Step 3: Flocculation and precipitation After the cyanide ion concentration in the cyanide-containing wastewater stock solution drops to 0.1-0.5 mg / L, the wastewater after the cyanide ions are decomposed is passed into the flocculation tank, and an appropriate amount of flocculant is added for flocculation and precipitation; Step 4: Discharge The wastewater treated in step 3 is filtered and the qualified filtrate is directly discharged.

2. The method for treating high-concentration cyanide-containing wastewater according to claim 1, characterized in that: In the ozone-three-dimensional electrolysis device, the mass ratio of the filled cyanide removal particle electrode to the cyanide-containing wastewater stock solution is 1:1-1:1.5; the catalytic electrolysis cyanide destruction reaction time is 60-120 minutes.

3. The method for treating high-concentration cyanide-containing wastewater according to claim 2, characterized in that: The foam metal is foam nickel, foam copper or foam titanium; the metal salt is Cu(NO3)2, Fe(NO3)3, Mn(NO3)2, Zn(NO3)2·6H2O, Zr(NO3)4·5H2O, Co(NO3)2· 6H2O, Sn(NO3)4, Ce(NO3)3·6H2O are mixed; the adhesive is polyacrylamide or calcium lignin sulfonate, wherein, The molar ratio of Cu element to Fe element is 0.2-0.5:1; The molar ratio of Cu element to Mn element is 0.5-1:1; The molar ratio of Cu element to Zn element is 1-4:1; The molar ratio of Cu element to Zr element is 2-5:1; The molar ratio of Cu element to Co element is 1-5:1; The molar ratio of Cu element to Sn element is 15-20:1; The molar ratio of Cu element to Ce element is 15-25:

1.

4. The method for treating high-concentration cyanide-containing wastewater according to claim 3, characterized in that: The weight percentages of the foam metal, metal salt and adhesive components are 50%-70%, 25%-40% and 5%-10% respectively.

5. A method for preparing a cyanide removal particle electrode for use in the method for treating high-concentration cyanide-containing wastewater according to any one of claims 1 to 4, comprising the following steps: Step 1: Pretreatment of foam metal 1) Soak the foam metal in 0.5-1 mol / L sodium hydroxide solution for 1-2 hours, filter it and wash it with deionized water until it is neutral; 2) ultrasonically clean the cleaned metal foam for 5-10 minutes, filter it and dry it at 105-110°C for 12-24 hours; Step 2: Preparation of metal salts Cu(NO3)2, Fe(NO3)3, Mn(NO3)2, Zn(NO3)2·6H2O, Zr(NO3)4·5H2O, Co(NO3)2·6H2O, Sn(NO3)4, Ce(NO3)3·6H2O were added into water, and fully dissolved and mixed under the action of a magnetic stirrer to obtain a mixed solution; The total mass of Cu(NO3)2, Fe(NO3)3, Mn(NO3)2, Zn(NO3)2·6H2O, Zr(NO3)4·5H2O, Co(NO3)2·6H2O, Sn(NO3)4, and Ce(NO3)3·6H2O is 25%-40% of the mass of the foamed metal; Step 3: Dipping Add the foamed metal and the metal salt obtained in step 1 and step 2 into a vessel containing polyacrylamide or calcium lignin sulfonate solution and mix for 3-6 hours, and filter to obtain the foamed metal bonded with the metal salt; Step 4: Drying The foamed metal obtained in the previous step is placed in a drying oven and dried at 85-105°C for 12-24h; Step 5: Calcination and activation The dried foamed metal obtained in the previous step is placed in a muffle furnace, fired at 550-600°C for 2-4 hours, and cooled to room temperature to obtain a calcined and activated cyanide removal particle electrode.

6. A device for treating high-concentration cyanide-containing wastewater, comprising a housing (9), characterized in that: The housing (9) is divided into two upper and lower cavities, the upper cavity (2) is a catalytic electrolysis reaction system, the lower cavity (3) is an ozone aeration system, and a ventilation baffle (4) is provided between the upper cavity (2) and the lower cavity (3); wherein, The catalytic electrolysis reaction system is composed of an anode (81), a cathode (82), and a cyanide removal particle electrode filled between the anode (81) and the cathode (82) and is used in the method for treating high-concentration cyanide-containing wastewater according to any one of claims 1 to 4; The ozone aeration system comprises an aeration pipe (91), one end of which passes through the side wall of the shell (9) and is connected to an external ozone generator (92); A water inlet (6) for the cyanide-containing wastewater is provided at the bottom of one side of the shell (9) corresponding to the upper cavity (2), and an overflow port (7) for discharging the cyanide-destroyed wastewater from the device is provided at the top of the other side of the shell (9) corresponding to the upper cavity (2).

7. The device for treating high-concentration cyanide-containing wastewater according to claim 6, characterized in that: The anode (81) is a graphite anode (81), the cathode (82) is a graphite cathode (82), and the ozone ventilation rate is controlled at 5-10 g / h.

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