A continuous cyanide breaking device

Abstract

The utility model belongs to the field of sewage treatment, and specifically discloses a continuous cyanide breaking device, comprising: a cyanide breaking kettle, provided with a heating device and a cyanide-containing wastewater feeding pipe, the top of the cyanide breaking kettle is connected to the spray tower; an oxidation kettle, provided with a cooling device and a chlorine-containing oxidant feeding pipe, the bottom of the oxidation kettle is respectively connected to the spray tower and the wastewater system; the top of the spray tower is connected to the tail gas system, and the bottom is connected to the oxidation kettle; a control system is used to realize automatic control of the continuous cyanide breaking device. The device is not only simple in structure, but also has a wide range of applications. The cyanide ion concentration in the wastewater treated by the continuous cyanide breaking device of the utility model is less than 5ppm, and the ammonia nitrogen concentration is less than 200ppm, so that the direct discharge of the cyanide-containing wastewater after treatment can be realized.

Description

Technical Field

[0001] The utility model belongs to the field of sewage treatment, and specifically relates to a continuous cyanide breaking device. Background Art

[0002] Cyanide wastewater refers specifically to wastewater containing cyanide. Cyanide is a class of compounds containing a carbon-nitrogen triple bond (-C≡N). The most common and common substance among cyanides, hydrogen cyanide (HCN), is a colorless gas or liquid with a slightly bitter almond smell. According to the type of functional group connected to it, it is often divided into inorganic cyanide and organic cyanide. Inorganic cyanide includes hydrocyanic acid, potassium cyanide, sodium cyanide, cyanogen chloride, etc. Organic cyanide generally includes nitriles (-C-CN) and isonitriles (-C-NC), such as acetonitrile, acrylonitrile and ethyl isocyanide. Due to the high toxicity of the cyanide group in cyanide, destroying the carbon-nitrogen triple bond (-C≡N) in cyanide-containing wastewater, that is, cyanide breaking treatment, has become one of the key points and difficulties in the field of cyanide-containing industrial wastewater treatment.

[0003] Cyanide-containing wastewater mainly comes from three occasions, namely, cyanide production wastewater, cyanide utilization wastewater and other product wastewater. Cyanide production wastewater mainly refers to wastewater generated by the production of inorganic cyanide and organic cyanide, such as sodium cyanide production wastewater. Due to the characteristics of cyanide ion (CN-) that it is easy to form a stable metal cyanide complex with precious metals, cyanide is often used in electroplating, metallurgy, metal processing and other industries, thus forming cyanide utilization wastewater, such as dissolving and extracting gold, metal parts processing and cutting, electroplating, etc. cyanide-containing wastewater. Other product wastewater mainly comes from the chemical, pharmaceutical and other industries, such as pesticide, pharmaceutical intermediate processing, coking, steelmaking industry wastewater, chemical fiber synthesis, synthetic ammonia process wastewater, etc.

[0004] The discharge of cyanide-containing wastewater into natural water bodies will seriously pollute the environment, threaten human health and the life of aquatic organisms. Excessive cyanide content in wastewater will affect the normal operation of the ecosystem. At present, the main methods for breaking cyanide in cyanide-containing wastewater are acid chlorination and alkaline chlorination. The acid chlorination method is to add acid to cyanide-containing wastewater to acidify cyanide ions into hydrocyanic acid. After hydrocyanic acid becomes gas, sodium hypochlorite or calcium hypochlorite is used to break cyanide. Because hydrocyanic acid is extremely volatile and toxic, it is difficult to control. In industry, extremely high-standard control measures are required to prevent people from poisoning. The alkaline chlorination method requires two-stage cyanide breaking to completely treat cyanide wastewater. The first-stage cyanide breaking requires adding lime or alkali to the cyanide-containing wastewater to adjust the pH value to above 10.5, and then adding sodium hypochlorite or calcium hypochlorite; the second-stage cyanide breaking requires adding acid to the cyanide-containing wastewater to adjust the pH value to about 8, and then adding sodium hypochlorite or calcium hypochlorite. This method not only requires two-stage cyanide breaking to completely treat cyanide wastewater, but also the amount of sodium hypochlorite or calcium hypochlorite used is relatively large. The chlorine oxidant usually added is 4 to 8 times the molar mass of the cyanide-containing compound, and the treatment cost is high.

[0005] Patent CN202410382267.5 discloses a treatment system for cyanide-containing wastewater, including a pretreatment system, a cyanide breaking system and a separation and recovery system, wherein the pretreatment system includes a pretreatment tank and a pretreatment tower, the pretreatment tank is used to adjust the pH of the feed wastewater, and the pretreatment tower is used to adjust the ammonia nitrogen of the feed wastewater. CN202320326355.4 discloses a cyanide-containing wastewater deep treatment system, including a regulating tank, a primary reaction tank, a tertiary reaction tank, and a multi-effect clarification treatment equipment connected in sequence, wherein the primary reaction tank is connected to a sulfuric acid dosing device and a sodium sulfite dosing device for adjusting the pH value. It can be seen that the pH value needs to be adjusted in the existing cyanide-containing wastewater system, and the process flow is long, the device is complex, and the cost is high. Utility Model Content

[0006] In order to solve the above problems, the utility model proposes a continuous cyanide breaking device suitable for industrial production, which has a simple structure, low operating cost and a wide range of applications. The system of the utility model is used to treat cyanide-containing wastewater, and the cyanide ion concentration in the treated wastewater is less than 5ppm, the ammonia nitrogen concentration is less than 200ppm, and the COD concentration is less than 3000ppm, so that the cyanide-containing wastewater can be directly discharged after treatment.

[0007] The utility model provides a continuous cyanide breaking device, which comprises:

[0008] A cyanide-breaking kettle is provided with a heating device and a cyanide-containing wastewater feeding pipe, and the top of the cyanide-breaking kettle is connected to the spray tower;

[0009] An oxidation kettle is provided with a cooling device and a chlorine-containing oxidant feed pipe, and the bottom of the oxidation kettle is respectively connected to the spray tower and the wastewater system;

[0010] A spray tower, the top of which is connected to the tail gas system, and the bottom of which is connected to the oxidation kettle;

[0011] The control system is used to realize automatic control of the continuous cyanide breaking device, and the automatic control can be fully automatic control or semi-automatic control.

[0012] Preferably, the continuous cyanide breaking device comprises a heat exchange device, and the top of the cyanide breaking kettle is connected to the heat exchange device and the spray tower in sequence.

[0013] Preferably, the chlorine-containing oxidant feed pipe is provided with an automatic chlorine-containing oxidant dosing system; and the oxidation kettle is provided with a stirring device.

[0014] Preferably, the continuous cyanide breaking device includes a monitoring system, which includes at least one of a temperature monitoring system, a pressure monitoring system, a cyanide ion concentration monitoring system and an ammonia nitrogen monitoring system; the monitoring system can directly or indirectly transmit at least a part of the monitored signal to the control system.

[0015] Preferably, the continuous cyanide breaking device comprises a stripping tower, and the bottom of the cyanide breaking kettle is connected to the stripping tower.

[0016] Preferably, the continuous cyanide breaking device further comprises an ammonia water tank, the bottom of the cyanide breaking kettle is connected to the stripping tower, and the stripping tower is respectively connected to a sewage discharge system and an ammonia water tank.

[0017] Preferably, the stripping tower is provided with a plurality of condensers in series, and the top of the stripping tower is connected to the condensers and the ammonia water tank in sequence.

[0018] Preferably, an exhaust valve is provided on the top of the cyanide-breaking kettle, and the exhaust valve is connected to the spray tower.

[0019] Preferably, a gas distribution device is provided at the bottom of the spray tower, and the gas distributor is connected to the exhaust valve.

[0020] Preferably, the spray tower is provided with several layers of fillers, and a spray device is provided above each layer of fillers, and the spray device is connected to the bottom of the oxidation kettle.

[0021] Compared with the prior art, the utility model has the following advantages:

[0022] 1. The continuous cyanide breaking device involved in the utility model has a simple structure and a short process flow. The cyanide-containing waste liquid does not need to be adjusted for pH value. The cyanide can be broken directly in the cyanide breaking kettle by high temperature and low pressure, and ammonia in the waste water can be recovered.

[0023] 2. The utility model utilizes a spray tower to absorb the gas generated in the cyanide breaking process, which not only greatly reduces the amount of chlorine oxidant used and reduces the process cost, but also the chlorine-containing oxidant is mixed and absorbed with the gas generated in the cyanide breaking kettle by spraying, thereby improving the absorption efficiency.

[0024] 3. The cyanide ion concentration in the wastewater treated by the continuous cyanide breaking device of the utility model can be reduced to less than 5ppm. The wastewater after cyanide breaking is further sent to the stripping tower for nitrogen recovery, and the recovered nitrogen can be finally extracted as dilute ammonia water. After steam stripping, the ammonia nitrogen concentration in the wastewater reaches below 200ppm. The cyanide ion concentration is diluted to below 0.5ppm with cyanide-free water and then directly sent to the sewage station for treatment as ordinary sewage.

[0025] 4. The cyanide-breaking kettle, spray tower and oxidation kettle contained in the continuous cyanide-breaking device of the utility model each have different functions. After the treated cyanide-containing wastewater in the cyanide-breaking kettle is discharged, a new batch of cyanide-containing wastewater to be treated can be put in for continuous treatment.

[0026] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0028] Figure 1 A schematic diagram of a continuous cyanide breaking device in one embodiment of the utility model is shown.

[0029] Description of reference numerals:

[0030] 1. Cyanide-breaking kettle; 2. Spray tower; 3. Oxidation kettle; 4. Stripping tower; 5. Ammonia water tank; 6. Oxidation kettle circulation pump; 7. Cyanide-containing wastewater feed pipe; 8. Chlorine-containing oxidant feed pipe; 9. Condenser I; 10. Condenser II; 11. Condenser III; 12. Dilute ammonia water; 13. Tail gas; 14. Sewage discharge system; 15. High-salt wastewater system; 16. Heat exchange device; 17. Chlorine-containing oxidant automatic dosing system; J1-J4, monitoring system. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein.

[0032] The continuous cyanide breaking device in the utility model comprises:

[0033] A cyanide-breaking kettle is provided with a heating device and a cyanide-containing wastewater feeding pipe, and the top of the cyanide-breaking kettle is connected to the spray tower;

[0034] An oxidation kettle is provided with a cooling device and a chlorine-containing oxidant feed pipe, and the bottom of the oxidation kettle is respectively connected to the spray tower and the wastewater system;

[0035] A spray tower, the top of which is connected to the tail gas system, and the bottom of which is connected to the oxidation kettle;

[0036] A control system is used to realize automatic control of the continuous cyanide breaking device.

[0037] In the utility model, the top of the cyanide breaking kettle is preferably provided with an exhaust valve, which is connected to the spray tower. In order to achieve uniform distribution of gas, a gas distribution device is preferably provided at the bottom of the spray tower, and the gas distributor is connected to the exhaust valve. The spray tower can also be provided with several layers of fillers, and a spray device is provided above each layer of fillers, and the spray device is connected to the bottom of the oxidation kettle.

[0038] Cyanide wastewater is heated and pressurized in the closed kettle of cyanide breaking kettle, and after keeping for a period of time, the exhaust valve is opened to introduce the gas phase in the kettle into the spray tower. The chlorine-containing oxidant solution from the oxidation kettle is sprayed onto the filler through a spray device, and the gas phase from the cyanide breaking kettle is evenly distributed through a gas distributor. On the surface of the filler, the gas-liquid two-phase close contact is carried out for mass transfer. The top of the spray tower is preferably provided with a condenser, and when the absorption liquid is extracted from the bottom of the tower and sent to the oxidation kettle for recycling, the top gas phase can be refluxed to the spray tower after condensation recovery, and the uncondensed gas phase is discharged to the tail gas system. When the cyanide ion concentration in the cyanide breaking kettle to be monitored is less than 5ppm, the cyanide breaking treatment of cyanide wastewater is completed.

[0039] In the utility model, a heat exchange device is preferably arranged between the exhaust valve and the spray tower, that is, after the gas phase in the cyanide-breaking kettle is discharged through the exhaust valve, it is initially cooled by the heat exchange device and then sent to the spray tower to mix with the chlorine-containing oxidant solution. In this way, not only the temperature in the spray tower can be controlled, but also the temperature of the circulating flow in the spray tower and the oxidation kettle can be reduced, further ensuring that the temperature in the oxidation kettle is controlled below the use temperature.

[0040] In order to further recycle nitrogen, preferably, the continuous cyanide breaking device includes a stripping tower, and the bottom of the cyanide breaking kettle is connected to the stripping tower. Further preferably, the continuous cyanide breaking device includes an ammonia water tank, and the bottom of the cyanide breaking kettle is connected to the stripping tower, and the stripping tower is respectively connected to the sewage discharge system and the ammonia water tank. More preferably, the stripping tower is provided with a plurality of condensers in series, and the top of the stripping tower is sequentially connected to the condenser and the ammonia water tank. Specifically, the wastewater that has completed the cyanide breaking in the cyanide breaking kettle is sent to the stripping tower for further steam stripping to reduce the ammonia nitrogen concentration in the wastewater, and the stripping treatment can be stopped when the ammonia nitrogen concentration is less than 200ppm. The gas phase evaporated during the stripping period can be sent to the ammonia water tank after condensation recovery, and finally extracted as a dilute ammonia product.

[0041] In the utility model, preferably, a stirring device is also provided in the oxidation kettle. The stirring device can fully mix the circulating flow and avoid the phenomenon of excessively high local temperature in the chlorine oxidant mixed liquid in the oxidation kettle.

[0042] In order to fully realize the automatic treatment of cyanide-containing wastewater, preferably, the chlorine-containing oxidant feed pipe is provided with an automatic chlorine-containing oxidant dosing system; the continuous cyanide breaking device includes a monitoring system, and the monitoring system includes at least one of a temperature monitoring system, a pressure monitoring system, a cyanide ion concentration monitoring system and an ammonia nitrogen monitoring system. The monitoring system can directly or indirectly transmit at least a part of the monitored signal to the control system.

[0043] In the utility model, when the temperature monitoring system and the pressure monitoring system monitor that the pressure in the cyanide-breaking kettle reaches a set value and stabilizes for a period of time, the signal is fed back to the control system, and the control system opens the exhaust valve of the cyanide-breaking kettle to introduce the gas phase into the spray tower. At the same time, the temperature monitoring system monitors the temperature in the oxidation kettle in real time to control the temperature of the chlorine-containing oxidant solution below the use temperature. When the cyanide ion concentration monitoring system monitors that the cyanide ion concentration in the cyanide-breaking kettle is less than 5ppm, the control system determines that the cyanide-breaking is completed, closes the exhaust valve, and starts the automatic dosing system of the chlorine-containing oxidant, and continues to add the chlorine-containing oxidant solution into the oxidation kettle until the gas in the spray tower is completely absorbed, and then the waste water that has completed the cyanide-breaking is slowly transferred out of the cyanide-breaking kettle.

[0044] During the material circulation of the spray tower, the ammonia nitrogen concentration in the oxidation kettle also needs to be monitored in real time. When the ammonia nitrogen monitoring system feeds back that the ammonia nitrogen concentration in the oxidation kettle is greater than 10ppm, the control system will gradually close the exhaust valve and start the automatic chlorine-containing oxidant dosing system at the same time to add sodium hypochlorite solution to the oxidation kettle and remove the high-salt wastewater in the oxidation kettle at the same rate until the ammonia nitrogen concentration in the oxidation kettle is less than or equal to 10ppm. The control system will stop the automatic chlorine-containing oxidant dosing system and slowly open the exhaust valve.

[0045] Example 1

[0046] A continuous cyanide breaking device Figure 1 As shown, it includes: a cyanide-breaking kettle 1, a spray tower 2, an oxidation kettle 3, a stripping tower 4, a heat exchange device 16, a control system and a monitoring system J1-J4; wherein,

[0047] The cyanide-breaking kettle 1 is provided with a heating device, a cyanide-containing wastewater feed pump and a cyanide-containing wastewater feed pipe 7. The top of the cyanide-breaking kettle 1 is provided with an exhaust valve, which is connected to the heat exchange device 16 and the spray tower 2 in sequence, and is connected to the stripping tower 4 at the bottom.

[0048] The oxidation kettle 3 is provided with a cooling device, an oxidation kettle circulation pump 6, a chlorine-containing oxidant feed pipe 9 and a stirring device. The bottom of the oxidation kettle 3 is connected to the spray tower 2, the top of the oxidation kettle 3 and the high-salt wastewater system 15 respectively through the oxidation kettle circulation pump 6; the chlorine-containing oxidant feed pipe 9 is provided with a chlorine-containing oxidant automatic dosing system 17.

[0049] The top of the spray tower 2 is connected to the condenser 1 9 in turn, and the bottom is connected to the oxidation kettle 3. The condenser 1 9 is connected to the top of the spray tower 2 and the tail gas system respectively. A gas distribution device is provided at the bottom of the spray tower 2, and the gas distributor is connected to the exhaust valve of the spray tower 2 through a pipeline. The spray tower is provided with several layers of packing, and a spray device is provided above each layer of packing, and the spray device is connected to the bottom of the oxidation kettle.

[0050] The top of the stripping tower is connected to the condenser II 10 , the condenser III 11 and the ammonia water tank 5 in sequence, and the bottom is connected to the sewage discharge system 14 .

[0051] The monitoring system includes a temperature monitoring system, a pressure monitoring system, a cyanide ion concentration monitoring system and an ammonia nitrogen monitoring system.

[0052] The specific working process is as follows: first, the cyanide-containing wastewater is injected into the cyanide-breaking kettle through the cyanide-containing wastewater feed pipe, and then the heating device is turned on to heat the cyanide-containing wastewater. As the heating proceeds, the wastewater pressure in the cyanide-breaking kettle will also rise. At the same time, the chlorine-containing oxidant solution is injected into the oxidation kettle through the chlorine-containing oxidant feed pipe, and the temperature in the oxidation kettle is maintained below the use temperature through the cooling device. The temperature change in the oxidation kettle is monitored throughout by the temperature monitoring system. After the temperature monitoring system and the pressure monitoring system detect that the cyanide-containing wastewater reaches the set temperature and pressure, the temperature and pressure are maintained for a period of time, and then the exhaust valve on the cyanide-breaking kettle is opened, and the gas phase is discharged from the exhaust valve on the top of the cyanide-breaking kettle and enters the gas distribution device at the bottom of the spray tower after being cooled by the heat exchange device. The chlorine-containing oxidant solution from the oxidation kettle is sprayed from the spray device of the spray tower to the packing layer, and contacts the gas phase evenly distributed by the gas distribution device in reverse. The liquid phase in the spray tower is sent back to the oxidation kettle, and continues to participate in the circulation of the material through the oxidation kettle circulating pump. After the gas phase is cooled by condenser I, the condensed material returns to the spray tower, and the uncondensed material is sent to the tail gas system. When the cyanide ion concentration monitoring system monitors that the cyanide ion concentration in the cyanide breaking kettle is less than 5ppm, the cyanide breaking treatment of the cyanide-containing wastewater is completed.

[0053] During the material circulation of the above-mentioned spray tower, the ammonia nitrogen monitoring system monitors the ammonia nitrogen concentration in the oxidation kettle in real time. When the ammonia nitrogen monitoring system feeds back that the ammonia nitrogen concentration in the oxidation kettle is greater than 10ppm, the control system gradually closes the exhaust valve, and starts the automatic dosing system of the chlorine-containing oxidant at the same time, replenishes the sodium hypochlorite solution into the oxidation kettle, and extracts the high-salt wastewater in the oxidation kettle at the same rate until the ammonia nitrogen concentration in the oxidation kettle is less than or equal to 10ppm. The control system will stop the automatic dosing system of the chlorine-containing oxidant, and then slowly open the exhaust valve to continue absorbing the gas phase from the cyanide breaking kettle.

[0054] Close the exhaust valve, start the automatic dosing system of chlorine-containing oxidant, and continue to add sodium hypochlorite solution for spraying to absorb the residual gas in the spray tower. After the gas is completely absorbed, the wastewater with cyanide broken is sent to the stripping tower. The cyanide-breaking wastewater is continuously steam stripped in the stripping tower, wherein the gas phase is continuously condensed by condenser II and condenser III and sent to the ammonia water tank to be extracted as dilute ammonia water, and the liquid phase is sent to the sewage station after the ammonia nitrogen monitoring system detects that the ammonia nitrogen concentration is less than 200ppm. After the wastewater with cyanide broken in the cyanide breaking kettle is sent to the stripping tower, a new batch of cyanide-containing wastewater can enter the cyanide breaking kettle again, and the cyanide breaking treatment is continuously carried out in the system.

[0055] The above-mentioned continuous cyanide breaking device is used to treat cyanide-containing wastewater, and the specific applications are as follows:

[0056] Application Example 1

[0057] Source of cyanide wastewater: wastewater after cyanidation and amination steps in the chemical preparation of L-carnitine. In the cyanide wastewater, the cyanide ion concentration is 3100ppm, the ammonia nitrogen concentration is 900ppm, the COD concentration is 13300ppm, and the pH is 10.

[0058] Application Example 2

[0059] The difference from Application Example 1 is that the wastewater comes from a one-pot synthesis process for preparing D,L-pantoic acid lactone using isobutyraldehyde as raw material. In the cyanide-containing wastewater, the cyanide ion concentration is 4300ppm, the ammonia nitrogen concentration is 2200ppm, the COD concentration is 14700ppm, and the pH is 5.

[0060] Application Example 3

[0061] The difference from Application Example 1 is that the wastewater comes from industrial cyanide-containing wastewater, the chlorine oxidant in the oxidation kettle is a 10wt% sodium hypochlorite aqueous solution, and in the cyanide-containing wastewater, the cyanide ion concentration is 8200ppm, the ammonia nitrogen concentration is 400ppm, the COD concentration is 23600ppm, and the pH is 6.

[0062] Table 1

[0063]

[0064] It can be seen from Table 1 above that the continuous cyanide breaking device of the utility model can effectively treat cyanide-containing wastewater, and the cyanide ion concentration in the treated wastewater is less than 5ppm, and the ammonia nitrogen concentration is less than 200ppm.

[0065] The various embodiments of the utility model have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A continuous cyanide breaking device, characterized in that: The continuous cyanide breaking device comprises: A cyanide-breaking kettle is provided with a heating device and a cyanide-containing wastewater feeding pipe, and the top of the cyanide-breaking kettle is connected to a spray tower; An oxidation kettle is provided with a cooling device and a chlorine-containing oxidant feed pipe, and the bottom of the oxidation kettle is respectively connected to the spray tower and the wastewater system; A spray tower, the top of which is connected to the tail gas system, and the bottom of which is connected to the oxidation kettle; A control system is used to realize automatic control of the continuous cyanide breaking device.

2. The continuous cyanide breaking device according to claim 1, characterized in that: The continuous cyanide breaking device comprises a heat exchange device, and the top of the cyanide breaking kettle is connected with the heat exchange device and the spray tower in sequence.

3. The continuous cyanide breaking device according to claim 1, characterized in that: The chlorine-containing oxidant feed pipe is provided with an automatic chlorine-containing oxidant dosing system; and the oxidation kettle is provided with a stirring device.

4. The continuous cyanide breaking device according to claim 1, characterized in that: The continuous cyanide breaking device comprises a monitoring system, and the monitoring system comprises at least one of a temperature monitoring system, a pressure monitoring system, a cyanide ion concentration monitoring system and an ammonia nitrogen monitoring system.

5. The continuous cyanide breaking device according to claim 1, characterized in that: The continuous cyanide breaking device comprises a stripping tower, and the bottom of the cyanide breaking kettle is connected to the stripping tower.

6. The continuous cyanide breaking device according to claim 5, characterized in that: The continuous cyanide breaking device also includes an ammonia water tank, and the stripping tower is connected to the sewage discharge system and the ammonia water tank respectively.

7. The continuous cyanide breaking device according to claim 6, characterized in that: The stripping tower is provided with a plurality of condensers in series, and the top of the stripping tower is connected with the condensers and the ammonia water tank in sequence.

8. The continuous cyanide breaking device according to claim 1, characterized in that: The top of the cyanide-breaking kettle is provided with an exhaust valve, and the exhaust valve is connected to the spray tower.

9. The continuous cyanide breaking device according to claim 8, characterized in that: A gas distribution device is provided at the bottom of the spray tower, and the gas distribution device is connected to the exhaust valve.

10. The continuous cyanide breaking device according to claim 9, characterized in that: The spray tower is provided with several layers of fillers, and a spray device is provided above each layer of fillers, and the spray device is connected to the bottom of the oxidation kettle.

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