A rapid detection method for cyanide in industrial wastewater

Abstract

The invention provides a kind of rapid detection method of cyanide in industrial wastewater, belong to the field of wastewater detection technology, it solves the technical problems such as existing sampling is uneven, detection accuracy is low.The rapid detection method of cyanide in this industrial wastewater, comprises the following steps: taking di-o-toluidine and hydrochloric acid and putting them into a reactor, after stirring and mixing, sending them into the liquid storage tank of detection equipment for storage;Detection equipment is placed in a wastewater tank, and multiple sampling components of detection equipment extend into the bottom of the wastewater tank, and the sampling component separates part of the wastewater in a confined space, then stirs and crushes the wastewater;After stirring and crushing, part of the wastewater is pumped into the detection box using a water pump;The mixed solution in the liquid storage tank is sent into the detection box using a quantitative liquid discharge mechanism and mixed with wastewater;After standing for 2 5min, the color of the liquid in the detection box is observed.The present invention has the advantages that cyanide is evenly distributed when sampling, improves detection accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater detection and relates to a detection method, in particular to a rapid detection method for cyanide in industrial wastewater. Background Art

[0002] Industrial wastewater refers to wastewater and liquid waste discharged during production processes. It contains industrial materials, intermediates, by-products, and pollutants generated during the production process. It is a major cause of environmental pollution, particularly water pollution. Common industrial wastewater includes cyanide wastewater.

[0003] Cyanide-containing wastewater refers to wastewater containing cyanide. Cyanide is divided into two categories: one is inorganic cyanide, such as hydrocyanic acid and its salts; the other is organic cyanide or nitrile, such as acrylonitrile and acetonitrile. The characteristic of cyanide ions is that they easily form complexes with certain metals. Nitrile is a compound in which a hydrocarbon group is connected to the carbon atom of a cyanide group, and it has a distinctive odor. In the coal coking process, hydrogen cyanide (ECN) is used to produce polyacrylonitrile fiber, sodium cyanide is used in metal electroplating, ore flotation, and the production of dyes, pharmaceuticals, and plastics, and potassium cyanide is used in the electrolytic refining of platinum. Metal coloring, electroplating, and pharmaceutical production processes all generate cyanide-containing wastewater.

[0004] The current method for detecting cyanide-containing wastewater mostly involves sampling and then using cyanide detection equipment to detect whether the wastewater exceeds the standard. Not only is the investment cost and subsequent maintenance cost of the detection equipment high, but the detection cycle is also long, which is not as convenient as on-site detection.

[0005] A search revealed a Chinese patent document that discloses a method for rapid qualitative testing of cyanide content in wastewater treatment [Application Number: 202011518773.0; Publication Number: CN 112798577A]. This method uses a mixed solution of o-toluidine and hydrochloric acid as the test reagent. First, a certain amount of cyanide-containing wastewater is injected into a test tube. Then, several drops of the test reagent are added to the test tube. Finally, the test tube is allowed to stand for 1-3 minutes and the color of the test tube is observed. The determination method is as follows: if the color of the cyanide-containing wastewater test tube turns yellow, it indicates that the wastewater contains excessive residual chlorine, meaning that the amount of sodium hypochlorite added is sufficient to oxidize free and partially complexed cyanide, and the cyanide-containing wastewater meets the standard. If the color of the cyanide-containing wastewater test tube does not turn yellow, it indicates that the amount of sodium hypochlorite added is too little, and the cyanide-containing wastewater exceeds the standard. The present invention provides a method for quickly and qualitatively testing the cyanide content in wastewater treatment. The method has the advantages of simple operation, low investment cost, rapid detection, and can determine whether the wastewater is qualified by direct observation, thus providing convenience for on-site detection.

[0006] Although the detection method disclosed in this patent can determine whether the wastewater is qualified through direct observation, which provides convenience for on-site detection, since the wastewater will produce precipitation when it is stored, some cyanide will settle to the bottom. When sampling, only the liquid above will be taken, which affects the accuracy of the detection. Even if a part of the precipitation is taken out during sampling, the ratio of precipitation to wastewater cannot be guaranteed, and the detection accuracy is limited. Summary of the Invention

[0007] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose a rapid detection method for cyanide in industrial wastewater. The technical problem to be solved by the invention is: how to achieve uniform distribution of cyanide during sampling and improve detection accuracy.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A rapid detection method for cyanide in industrial wastewater comprises the following steps:

[0010] S1. Place di-o-toluidine and hydrochloric acid into a reaction kettle, stir and mix, and then place them into a liquid storage tank of a detection device for storage;

[0011] S2. Place the detection device in the wastewater pool, and extend multiple sampling components of the detection device into the bottom of the wastewater pool. The sampling components separate part of the wastewater in a closed space, and then stir and crush the wastewater;

[0012] S3. After the mixing and crushing is completed, a part of the wastewater is pumped into the detection box using a water pump;

[0013] S4. The mixed liquid in the liquid storage tank is sent into the detection box by using the quantitative liquid discharge mechanism to mix with the wastewater;

[0014] S5. After standing for 2-5 minutes, observe the color of the liquid in the test box. If the color of the cyanide-containing wastewater test box turns yellow, it means that the wastewater contains excessive cyanide, that is, the amount of the mixed solution of o-toluidine and hydrochloric acid added is sufficient to oxidize free and part of the complexed cyanide, and the cyanide-containing wastewater meets the standard; if the color of the cyanide-containing wastewater test tube does not show yellow, it means that the amount of the mixed solution of o-toluidine and hydrochloric acid added is too little, and the cyanide-containing wastewater exceeds the standard.

[0015] The reagents required for the mixed solution of o-tolidine and hydrochloric acid are: analytically pure o-tolidine and analytically pure hydrochloric acid.

[0016] The mixed solution of o-toluidine and hydrochloric acid is prepared by weighing 0.2 g of o-toluidine and dissolving it in 10 ml of 1:4 hydrochloric acid, adding water to 100 ml, and adding 100 ml of 1:4 hydrochloric acid under continuous stirring to prepare a mixed solution.

[0017] The equipment used in the steps S1-S5 is a detection device, which includes a base, an air bag fixed on the periphery of the base, an air pump provided on the air bag, a plurality of sampling components provided on the lower side of the base, a detection box fixed on the upper side of the base, an observation window provided on the front side of the detection box, a bracket fixed on the upper side of the base, a liquid storage tank fixed on the bracket, a quantitative liquid discharge mechanism provided between the liquid storage tank and the detection box, the sampling component includes a first sampling cylinder and a second sampling cylinder, the second sampling cylinder extends into the first sampling cylinder, and a telescopic mechanism is provided between the first sampling cylinder and the second sampling cylinder, and a rotating motor is fixed on the upper end of the first sampling cylinder The rotating motor is located in the machine base, and the output shaft end of the rotating motor is fixed with a first stirring shaft, and a plurality of first crushing knives are fixed on the first stirring shaft. A telescopic cavity is opened inside the first stirring shaft, and a second stirring shaft is slidably connected in the telescopic cavity. A plurality of second crushing knives are slidably connected on the second stirring shaft. The lower end of the second stirring shaft is rotatably connected to the limited seat, and the limited seat is fixedly connected to the lower end of the second sampling cylinder through a connecting rod. A liquid pump is fixed on the first sampling cylinder, and a liquid suction tube extending into the first sampling cylinder is fixed at the liquid inlet end of the liquid pump, and a liquid delivery tube is fixed at the liquid outlet end of the liquid pump, and the other end of the liquid delivery tube is fixedly connected to the detection box.

[0018] The working principle of the present invention is: during operation, the air bag is inflated by an air pump. Initially, the second sampling tube is retracted into the first sampling tube. After the equipment is placed in the designated position in the wastewater pool, the telescopic mechanism drives the second sampling tube to extend, so that the second sampling tube descends until the lower end of the second sampling tube contacts the bottom of the wastewater pool. The air bag is deflated, and then the rotating motor is started. The rotating motor drives the first stirring shaft and the second stirring shaft to rotate, thereby using the first crushing knife and the second crushing knife to stir the wastewater, so that the sediment inside the wastewater pool is lifted up, and the first crushing knife and the second crushing knife are used to crush the particles. After crushing for a period of time, the liquid extraction pump extracts the waste liquid from the enclosed space formed by the first sampling tube and the second sampling tube through the liquid extraction tube, and then sends it into the detection box through the liquid delivery tube. After a certain amount is extracted, it is quantitatively discharged. The mechanism sends a certain amount of a mixture of o-toluidine and hydrochloric acid into the detection box, and after standing for 2-5 minutes, observes the color of the liquid in the detection box. If the color of the cyanide-containing wastewater detection box turns yellow, it means that the wastewater contains excessive cyanide, that is, the dosage of the o-toluidine and hydrochloric acid mixture is sufficient to oxidize free and part of the complex cyanide, and the cyanide-containing wastewater meets the standard; if the color of the cyanide-containing wastewater test tube does not show yellow, it means that the dosage of the o-toluidine and hydrochloric acid mixture is too small, and the cyanide-containing wastewater exceeds the standard. With the setting of this structure, multi-point sampling can be carried out in the wastewater pool, and the sediment at the bottom of the wastewater pool can be lifted and crushed, so that the pollutants in the wastewater are evenly distributed, so that when sampling, the wastewater quality of the sample is consistent with that in the wastewater pool, thereby greatly ensuring the accuracy of the detection.

[0019] The telescopic mechanism includes a telescopic motor, a telescopic slot is opened inside the first sampling tube, a telescopic motor is fixed to the bottom of the telescopic slot, a threaded rod is fixed to the output shaft end of the telescopic motor, a telescopic seat is threadedly connected to the threaded rod, the telescopic seat is fixedly connected to the second sampling tube, and telescopic covers are fixed on the upper and lower sides of the telescopic seat, and the other end of the telescopic cover is fixedly connected to the telescopic cavity.

[0020] With the above structure, during operation, the telescopic motor drives the threaded rod to rotate, and the threaded rod drives the telescopic seat to move up and down, thereby driving the second sampling tube to rise and fall, so that the second sampling tube can contact the bottom of the wastewater pool during operation, and when stored, the second sampling tube can be put away, which is not only convenient for storage, but also more convenient when the device enters and exits the wastewater pool. The setting of the telescopic cover can make the threaded rod located in a closed space, preventing wastewater from contacting the threaded rod, thereby protecting the threaded rod.

[0021] A liquid delivery pump is fixed to the upper outer end of the first sampling cylinder, the liquid inlet end of the liquid delivery pump is fixedly connected to a telescopic tube, the other end of the telescopic tube is connected to the lower end of the second sampling cylinder, and the liquid outlet end of the liquid delivery pump is connected to the upper part of the first sampling cylinder.

[0022] By adopting the above structure, while the wastewater is being stirred and crushed, the liquid feeding pump can be turned on, so that the wastewater in the lower part of the second sampling tube is sent to the upper part of the first sampling tube through the telescopic tube, so that the wastewater with higher concentration in the lower part can be mixed with the wastewater with higher concentration in the upper part, thereby improving the uniformity of the wastewater inside the sampling tube and ensuring the quality of sampling.

[0023] A plurality of sliding seats are slidably connected to the second stirring shaft, the second crushing knife is fixedly connected to the sliding seat, a plurality of grooves are provided on the inner circumference of the sliding seat, a first spring is fixed inside the groove, a limiting block is fixed at the other end of the first spring, an unlocking cavity is provided inside the second stirring shaft, a plurality of limiting holes are provided on the second stirring shaft, one end of the limiting hole is connected to the unlocking cavity, the other end of the limiting hole corresponds to the groove, the limiting block extends into the limiting hole, an unlocking rod is fixed in the telescopic cavity, an unlocking assembly is provided in the limiting hole, and the lower end of the unlocking rod extends into the unlocking cavity.

[0024] With the above structure, during normal operation, the limit block is inserted into the limit hole to limit the sliding seat, so that the second crushing knife can work normally. When the second sampling cylinder moves into the first sampling cylinder, the unlocking rod contacts the unlocking component of the upper sliding seat from top to bottom in sequence, so that the unlocking component pushes out the corresponding limit block, so that the upper sliding seat can release the limit with the second stirring shaft, thereby preventing the upper sliding seat from interfering with the recovery action of the second stirring shaft.

[0025] A connecting rope is fixed between adjacent sliding seats, a connecting rope is also fixed between the sliding seat at the lower end and the limiting seat, and a connecting rope is fixed between the sliding seat at the upper end and the first stirring shaft.

[0026] With the above structure, when the second stirring shaft is unfolded, the sliding seat can be moved back to the initial position under the action of the connecting rope, so that the limiting block can re-enter the limiting hole to limit the sliding seat.

[0027] The unlocking assembly includes a second spring, which is fixed in the limiting hole. A triangular seat is fixed to the other end of the second spring. A pointed cone portion cooperating with the triangular seat is provided at the lower end of the unlocking rod. An ejection rod is fixed to one end of the triangular seat located in the limiting hole, and the ejection rod is in contact with the limiting block.

[0028] With the above structure, when the unlocking rod descends, the pointed cone contacts the triangular seat, thereby pushing the triangular seat into the limit hole, driving the ejection rod to move, and the ejection rod ejects the limit block to complete the unlocking operation of the sliding seat. The whole process has a high degree of automation, good structural tightness, low failure rate and low cost.

[0029] The quantitative discharge mechanism includes a discharge pipe, the upper end of the discharge pipe is connected to the liquid storage tank, the lower end of the discharge pipe is connected to the detection box, a control valve is provided on the discharge pipe, a driving gear is fixed on the valve stem of the control valve, an annular buoyancy seat is placed inside the detection box, a driving rod is fixed on the annular buoyancy seat, a support rod is fixed on the detection box, a lifting rod is slidably connected to the support rod, a mounting plate is fixed on the driving rod and the lifting rod, an electric telescopic column is fixed on the mounting plate, a tooth plate is fixed on the telescopic end of the electric telescopic column, a limiting slide rail is fixed on the discharge pipe, the limiting slide rail is slidably connected to the limiting slide, and the driving rod and the lifting rod are fixedly connected to the limiting slide through a connecting rod.

[0030] When the gear train is in a state of equilibrium, the gear train is moved upwards and the gears on the left and right engage with the gear train, thereby driving the gear train to rotate and closing the control valve, so that the mixed solution of o-toluidine and hydrochloric acid in the liquid storage tank enters the detection box. When the mixed solution of o-toluidine and hydrochloric acid is added, the annular buoyancy seat continues to rise, and the gear train on the left is disengaged from the drive gear. Under the action of the connecting rod and the lifting rod, the gear train on the right continues to rise. After the mixed solution of o-toluidine and hydrochloric acid is added to a certain extent, the gear train on the right engages with the drive gear, driving the drive gear to reverse, thereby closing the control valve and stopping the addition of liquid, thus realizing the work of quantitative addition of liquid. The gear train has a high degree of automation, does not require manual control, does not require measuring elements, has a low failure rate, and when it needs to return to its original position, the electric telescopic column drives the gear train to move so that the gear train will not engage with the drive gear, and the return operation can be performed. The operation is simple and convenient.

[0031] Compared with the existing technology, this rapid detection method for cyanide in industrial wastewater has the following advantages:

[0032] 1. By adopting the detection method of the present invention, cyanide in the wastewater can be evenly distributed during sampling, thereby ensuring the accuracy of sampling and thus the accuracy of detection. At the same time, it is not necessary to disturb all the wastewater in the wastewater pool, thereby reducing the detection cost and detection difficulty. At the same time, the use of a multi-point sampling method can further ensure the accuracy of detection.

[0033] 2. During operation, the air bag is inflated by the air pump. Initially, the second sampling tube is retracted into the first sampling tube. After the equipment is placed in the designated position in the wastewater pool, the telescopic mechanism drives the second sampling tube to extend, so that the second sampling tube descends until the lower end of the second sampling tube contacts the bottom of the wastewater pool. The air bag is deflated, and then the rotating motor is started. The rotating motor drives the first stirring shaft and the second stirring shaft to rotate, thereby using the first crushing knife and the second crushing knife to stir the wastewater, so that the sediment inside the wastewater pool is lifted up, and the first crushing knife and the second crushing knife are used to crush the particles. After crushing for a period of time, the liquid extraction pump extracts the waste liquid from the enclosed space formed by the first sampling tube and the second sampling tube through the liquid extraction tube, and then sends it into the detection box through the liquid feeding tube. After a certain amount of liquid is extracted, a certain amount is discharged through the quantitative liquid discharge mechanism. A quantitative mixture of o-toluidine and hydrochloric acid is fed into the detection box. After standing for 2-5 minutes, the color of the liquid in the detection box is observed. If the color of the cyanide-containing wastewater detection box turns yellow, it means that the wastewater contains excessive cyanide, that is, the dosage of the o-toluidine and hydrochloric acid mixture is sufficient to oxidize free and part of the complex cyanide, and the cyanide-containing wastewater meets the standard; if the color of the cyanide-containing wastewater test tube does not show yellow, it means that the dosage of the o-toluidine and hydrochloric acid mixture is too small, and the cyanide-containing wastewater exceeds the standard. With the setting of this structure, multi-point sampling can be carried out in the wastewater pool, and the sediment at the bottom of the wastewater pool can be lifted and crushed, so that the pollutants in the wastewater are evenly distributed, so that when sampling, the wastewater quality of the sample is consistent with that in the wastewater pool, thereby greatly ensuring the accuracy of the detection.

[0034] 3. While the wastewater is being stirred and crushed, the liquid feeding pump can be turned on to allow the wastewater in the lower part of the second sampling tube to be fed into the upper part of the first sampling tube through the telescopic tube, so that the wastewater with higher concentration in the lower part can be mixed with the wastewater with higher concentration in the upper part, thereby improving the uniformity of the wastewater inside the sampling tube and ensuring the quality of sampling.

[0035] 4. During normal operation, the limit block is inserted into the limit hole to limit the sliding seat so that the second crushing knife can work normally. When the second sampling cylinder moves into the first sampling cylinder, the unlocking rod contacts the unlocking component of the upper sliding seat from top to bottom in sequence, so that the unlocking component pushes out the corresponding limit block, so that the upper sliding seat can release the limit with the second stirring shaft, thereby preventing the upper sliding seat from interfering with the recovery action of the second stirring shaft.

[0036] 5. When the second stirring shaft is unfolded, the sliding seat can be moved back to the initial position under the action of the connecting rope, so that the limit block can re-enter the limit hole to limit the sliding seat.

[0037] 6. When wastewater is added into the detection box, under the action of buoyancy, the annular buoyancy seat moves up, and the two tooth plates rise. After the left tooth plate rises to a certain position, it meshes with the drive gear, thereby driving the drive gear to rotate, so that the control valve opens, and the mixed solution of o-toluidine and hydrochloric acid in the storage tank enters the detection box. When the mixed solution of o-toluidine and hydrochloric acid is added, the annular buoyancy seat continues to rise, and the left tooth plate disengages from the drive gear. Under the action of the connecting rod and the lifting rod, the right tooth plate continues to rise. After the mixed solution of o-toluidine and hydrochloric acid is added to a certain level, the right tooth plate meshes with the drive gear, driving the drive gear to reverse, thereby closing the control valve and stopping the addition of liquid, realizing the work of quantitative addition, with a high degree of automation, no need for manual control, no need for measuring elements, and a low failure rate. When it needs to return, the electric telescopic column drives the tooth plate to move so that the tooth plate will not mesh with the drive gear, and the return operation can be performed. The operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a process flow chart of the present invention.

[0039] Figure 2 It is a structural schematic diagram of the detection equipment in the present invention.

[0040] Figure 3 It is a structural schematic diagram of the sampling component in the present invention.

[0041] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle.

[0042] Figure 5 yes Figure 3 A partial enlarged view of point A in the middle.

[0043] Figure 6 It is a schematic structural diagram of the first stirring shaft and the second stirring shaft in the present invention.

[0044] Figure 7 Figure 6 A partial enlarged view of point C in the middle.

[0045] Figure 8 It is a structural schematic diagram of the quantitative liquid discharge component in the present invention.

[0046] Figure 9 It is a schematic diagram of the installation structure of the tooth plate in the present invention.

[0047] In the figure, 1, machine base; 2, sampling assembly; 3, detection box; 4, bracket; 5, liquid storage tank; 6, first sampling tube; 7, second sampling tube; 8, rotating motor; 9, first stirring shaft; 10, first crushing knife; 11, sliding seat; 12, second crushing knife; 13, liquid feeding pump; 14, telescopic tube; 15, liquid extraction tube; 16, liquid extraction pump; 17, liquid feeding tube; 18, telescopic slot; 19, telescopic motor; 20, threaded rod; 21, telescopic seat; 22, telescopic cover; 23, limit seat; 24, connecting rod; 25, telescopic Retraction chamber; 26. Unlocking rod; 27. Unlocking chamber; 28. Connecting rope; 29. Groove; 30. First spring; 31. Limit block; 32. Limit hole; 33. Second spring; 34. Triangular seat; 35. Ejector rod; 36. Observation window; 37. Annular buoyancy seat; 38. Driving rod; 39. Limit slide rail; 40. Drain pipe; 41. Limit slide; 42. Control valve; 43. Valve stem; 44. Driving gear; 45. Mounting plate; 46. Electric telescopic column; 47. Gear plate; 48. Support rod; 49. Lifting rod. DETAILED DESCRIPTION

[0048] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0049] like Figures 1-9 As shown, the rapid detection method of cyanide in industrial wastewater comprises the following steps:

[0050] S1, taking di-o-toluidine and hydrochloric acid into a reaction kettle, stirring and mixing, and then sending them into the liquid storage tank 5 of the detection equipment for storage;

[0051] S2. Place the detection device in the wastewater pool, and extend multiple sampling components 2 of the detection device into the bottom of the wastewater pool. The sampling components 2 separate part of the wastewater in a closed space, and then stir and crush the wastewater;

[0052] S3, after the stirring and crushing is completed, a part of the wastewater is pumped into the detection box 3 by a water pump;

[0053] S4, the mixed liquid in the liquid storage tank 5 is sent into the detection box 3 by the quantitative liquid discharge mechanism to mix with the wastewater;

[0054] S5. After standing for 2-5 minutes, observe the color of the liquid in the detection box 3. If the color of the cyanide-containing wastewater detection box 3 turns yellow, it means that the wastewater contains excessive cyanide, that is, the amount of the mixed solution of o-toluidine and hydrochloric acid added is sufficient to oxidize free and part of the complexed cyanide, and the cyanide-containing wastewater meets the standard; if the color of the cyanide-containing wastewater test tube does not show yellow, it means that the amount of the mixed solution of o-toluidine and hydrochloric acid added is too little, and the cyanide-containing wastewater exceeds the standard.

[0055] The reagents required for the mixed solution of o-tolidine and hydrochloric acid are: analytically pure o-tolidine and analytically pure hydrochloric acid.

[0056] The mixed solution of o-toluidine and hydrochloric acid is prepared by weighing 0.2 g of o-toluidine and dissolving it in 10 ml of 1:4 hydrochloric acid, adding water to 100 ml, and adding 100 ml of 1:4 hydrochloric acid under continuous stirring to prepare a mixed solution.

[0057] The equipment used in the steps S1-S5 is a detection device, which includes a base 1, an air bag is fixed on the periphery of the base 1, an air pump is provided on the air bag, a plurality of sampling components 2 are provided on the lower side of the base 1, a detection box 3 is fixed on the upper side of the base 1, an observation window 36 is provided on the front side of the detection box 3, a bracket 4 is fixed on the upper side of the base 1, a liquid storage tank 5 is fixed on the bracket 4, a quantitative liquid discharge mechanism is provided between the liquid storage tank 5 and the detection box 3, the sampling component 2 includes a first sampling cylinder 6 and a second sampling cylinder 7, the second sampling cylinder 7 extends into the first sampling cylinder 6, and a telescopic mechanism is provided between the first sampling cylinder 6 and the second sampling cylinder 7, a rotating motor 8 is fixed on the upper end of the first sampling cylinder 6, and the rotating motor 8 Located in the machine base 1, the output shaft end of the rotating motor 8 is fixed with a first stirring shaft 9, and a number of first crushing knives 10 are fixed on the first stirring shaft 9. A telescopic cavity 25 is opened inside the first stirring shaft 9, and a second stirring shaft is slidably connected in the telescopic cavity 25. A number of second crushing knives 12 are slidably connected on the second stirring shaft. The lower end of the second stirring shaft is rotatably connected to a limit seat 23, and the limit seat 23 is fixedly connected to the lower end of the second sampling cylinder 7 through a connecting rod 24. A liquid pump 16 is fixed on the first sampling cylinder 6, and a liquid inlet end of the liquid pump 16 is fixed with a liquid suction tube 15 extending into the first sampling cylinder 6, and a liquid delivery tube 17 is fixed to the liquid outlet end of the liquid pump 16. The other end of the liquid delivery tube 17 is fixed to the detection box 3.

[0058] With the above structure, when working, the air bag is inflated by the air pump. Initially, the second sampling tube 7 is retracted into the first sampling tube 6. After the equipment is placed in the designated position in the wastewater tank, the telescopic mechanism drives the second sampling tube 7 to extend, so that the second sampling tube 7 descends until the lower end of the second sampling tube 7 contacts the bottom of the wastewater tank. The air bag is deflated, and then the rotating motor 8 is started. The rotating motor 8 drives the first stirring shaft 9 and the second stirring shaft to rotate, so that the first crushing knife 10 and the second crushing knife 12 are used to stir the wastewater, so that the sediment inside the wastewater tank is lifted up, and the first crushing knife 10 and the second crushing knife 12 are used to crush the particles. After crushing for a period of time, the liquid extraction pump 16 extracts the waste liquid from the enclosed space formed by the first sampling tube 6 and the second sampling tube 7 through the liquid extraction pipe 15, and then sends it into the detection box 3 through the liquid feeding pipe 17. When the waste liquid is extracted to a certain level After the quantity is measured, a certain amount of the mixed solution of o-toluidine and hydrochloric acid is sent into the detection box 3 through the quantitative discharge mechanism. After standing for 2-5 minutes, the color of the liquid in the detection box 3 is observed. If the color of the cyanide-containing wastewater detection box 3 turns yellow, it means that the wastewater contains excessive cyanide, that is, the dosage of the mixed solution of o-toluidine and hydrochloric acid is sufficient to oxidize free and part of the complex cyanide, and the cyanide-containing wastewater meets the standard; if the color of the cyanide-containing wastewater test tube does not show yellow, it means that the dosage of the mixed solution of o-toluidine and hydrochloric acid is too small, and the cyanide-containing wastewater exceeds the standard. With the setting of this structure, multi-point sampling can be carried out in the wastewater pool, and the sediment at the bottom of the wastewater pool can be lifted and crushed, so that the pollutants in the wastewater are evenly distributed, so that when sampling, the wastewater quality of the sample is consistent with that in the wastewater pool, thereby greatly ensuring the accuracy of the detection.

[0059] The telescopic mechanism includes a telescopic motor 19, a telescopic slot 18 is opened inside the first sampling tube 6, the telescopic motor 19 is fixed to the bottom of the telescopic slot 18, a threaded rod 20 is fixed to the output shaft end of the telescopic motor 19, a telescopic seat 21 is threadedly connected to the threaded rod 20, the telescopic seat 21 is fixedly connected to the second sampling tube 7, and telescopic covers 22 are fixed on the upper and lower sides of the telescopic seat 21, and the other end of the telescopic cover 22 is fixedly connected to the telescopic cavity 25.

[0060] With the above structure, during operation, the telescopic motor 19 drives the threaded rod 20 to rotate, and the threaded rod 20 drives the telescopic seat 21 to move up and down, thereby driving the second sampling tube 7 to rise and fall, so that the second sampling tube 7 can contact the bottom of the wastewater pool during operation, and when stored, the second sampling tube 7 can be folded up, which is not only convenient for storage, but also more convenient when the device enters and exits the wastewater pool. The setting of the telescopic cover 22 can make the threaded rod 20 located in a closed space, preventing wastewater from contacting the threaded rod 20, thereby protecting the threaded rod 20.

[0061] A liquid feeding pump 13 is fixed to the upper outer end of the first sampling cylinder 6 , and a telescopic tube 14 is fixedly connected to the liquid inlet end of the liquid feeding pump 13 . The other end of the telescopic tube 14 is connected to the lower end of the second sampling cylinder 7 , and the liquid outlet end of the liquid feeding pump 13 is connected to the upper part of the first sampling cylinder 6 .

[0062] By adopting the above structure, while the wastewater is being stirred and crushed, the liquid feeding pump 13 can be turned on, so that the wastewater in the lower part of the second sampling tube 7 is sent to the upper part of the first sampling tube through the telescopic tube 14, so that the wastewater with higher concentration in the lower part can be mixed with the wastewater with higher concentration in the upper part, thereby improving the uniformity of the wastewater inside the sampling tube and ensuring the quality of sampling.

[0063] A plurality of sliding seats 11 are slidably connected to the second stirring shaft, and the second crushing knife 12 is fixedly connected to the sliding seat 11. A plurality of grooves 29 are provided on the inner periphery of the sliding seat 11, and a first spring 30 is fixed inside the groove 29. A limiting block 31 is fixed at the other end of the first spring 30. An unlocking cavity 27 is provided inside the second stirring shaft, and a plurality of limiting holes 32 are provided on the second stirring shaft. One end of the limiting hole 32 is communicated with the unlocking cavity 27, and the other end of the limiting hole 32 corresponds to the groove 29. The limiting block 31 extends into the limiting hole 32, and an unlocking rod 26 is fixed in the telescopic cavity 25. An unlocking assembly is provided in the limiting hole 32, and the lower end of the unlocking rod 26 extends into the unlocking cavity 27.

[0064] With the above structure, during normal operation, the limit block 31 is inserted into the limit hole 32 to limit the sliding seat 11, so that the second crushing knife 12 can work normally. When the second sampling cylinder 7 moves into the first sampling cylinder 6, the unlocking rod 26 contacts the unlocking component of the upper sliding seat 11 from top to bottom, so that the unlocking component pushes out the corresponding limit block 31, so that the upper sliding seat 11 can release the limit with the second stirring shaft, thereby preventing the upper sliding seat 11 from interfering with the recovery action of the second stirring shaft.

[0065] A connecting rope 28 is fixed between adjacent sliding seats 11 , a connecting rope 28 is also fixed between the lowermost sliding seat 11 and the limiting seat 23 , and a connecting rope 28 is fixed between the uppermost sliding seat 11 and the first stirring shaft 9 .

[0066] With the above structure, when the second stirring shaft is unfolded, the connecting rope 28 can move the sliding seat 11 back to its initial position, so that the limiting block 31 can re-enter the limiting hole 32 to limit the sliding seat 11.

[0067] The unlocking assembly includes a second spring 33, which is fixed in the limiting hole 32. A triangular seat 34 is fixed to the other end of the second spring 33. The lower end of the unlocking rod 26 is provided with a pointed cone portion that cooperates with the triangular seat 34. An ejection rod 35 is fixed to one end of the triangular seat 34 located in the limiting hole 32, and the ejection rod 35 is in contact with the limiting block 31.

[0068] With the above structure, when the unlocking rod 26 descends, the pointed cone portion contacts the triangular seat 34, thereby pushing the triangular seat 34 to move into the limiting hole 32, driving the ejection rod 35 to move, and the ejection rod 35 ejects the limiting block 31 to complete the unlocking operation of the sliding seat 11. The whole process has a high degree of automation, good structural tightness, low failure rate and low cost.

[0069] The quantitative discharge mechanism includes a discharge pipe 40, the upper end of the discharge pipe 40 is connected to the liquid storage tank 5, and the lower end of the discharge pipe 40 is connected to the detection box 3. A control valve 42 is provided on the discharge pipe 40, and a driving gear 44 is fixed on the valve stem 43 of the control valve 42. An annular buoyancy seat 37 is placed inside the detection box 3, and a driving rod 38 is fixed on the annular buoyancy seat 37. A support rod 48 is fixed on the detection box 3, and a lifting rod 49 is slidably connected to the support rod 48. A mounting plate 45 is fixed on the driving rod 38 and the lifting rod 49, and an electric telescopic column 46 is fixed on the mounting plate 45. The telescopic end of the electric telescopic column 46 is fixed with a tooth plate 47, and a limiting slide rail 39 is fixed on the discharge pipe 40. The limiting slide rail 39 is slidably connected to the limiting slide 41, and the driving rod 38 and the lifting rod 49 are fixedly connected to the limiting slide 41 through a connecting rod 24.

[0070] With the above structure, when wastewater is added to the detection box 3, under the action of buoyancy, the annular buoyancy seat 37 moves up, the two tooth plates 47 rise, and after the left tooth plate 47 rises to a certain position, it engages with the drive gear 44, thereby driving the drive gear 44 to rotate, so that the control valve 42 is opened, and the mixed solution of o-toluidine and hydrochloric acid in the liquid storage tank 5 enters the detection box 3. When the mixed solution of o-toluidine and hydrochloric acid is added, the annular buoyancy seat 37 continues to rise, and the left tooth plate 47 disengages from the drive gear 44. Under the action of , the toothed plate 47 on the right continues to rise. After the mixed solution of o-toluidine and hydrochloric acid is added to a certain level, the toothed plate 47 on the right engages with the driving gear 44, driving the driving gear 44 to reverse, thereby closing the control valve 42 and stopping the addition of liquid, thereby realizing the work of quantitative addition of liquid, with a high degree of automation, no need for manual control, no need for measuring elements, and a low failure rate. When it needs to return to its original position, the electric telescopic column 46 drives the toothed plate 47 to move, so that the toothed plate 47 will not engage with the driving gear 44, and the return operation can be performed, which is simple and convenient to operate.

[0071] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A rapid detection method for cyanide in industrial wastewater, characterized in that: The following steps are involved: S1, putting di-o-toluidine and hydrochloric acid into a reaction kettle, stirring and mixing, and then sending them into the liquid storage tank (5) of the detection equipment for storage; S2. placing the detection device in the wastewater pool, with multiple sampling components (2) of the detection device extending into the bottom of the wastewater pool, the sampling components (2) separating part of the wastewater in a closed space, and then stirring and crushing the wastewater; S3, after the mixing and crushing is completed, a part of the wastewater is pumped into the detection box (3) by using a water pump; S4, sending the mixed liquid in the liquid storage tank (5) into the detection tank (3) by using the quantitative liquid discharge mechanism to mix with the wastewater; S5. After standing for 2-5 minutes, observe the color of the liquid in the test box (3). If the color of the cyanide-containing wastewater test box (3) turns yellow, it means that the wastewater contains excessive cyanide, that is, the amount of the mixed solution of o-toluidine and hydrochloric acid added is sufficient to oxidize free and part of the complexed cyanide, and the cyanide-containing wastewater meets the standard; if the color of the cyanide-containing wastewater test tube does not show yellow, it means that the amount of the mixed solution of o-toluidine and hydrochloric acid added is too little, and the cyanide-containing wastewater exceeds the standard; The detection equipment used in the steps S1-S5 includes a machine base (1), an air bag is fixed on the periphery of the machine base (1), an air pump is provided on the air bag, a plurality of sampling components (2) are provided on the lower side of the machine base (1), a detection box (3) is fixed on the upper side of the machine base (1), an observation window (36) is provided on the front side of the detection box (3), a bracket (4) is fixed on the upper side of the machine base (1), a liquid storage tank (5) is fixed on the bracket (4), a quantitative liquid discharge mechanism is provided between the liquid storage tank (5) and the detection box (3), the sampling component (2) includes a first sampling cylinder (6) and a second sampling cylinder (7), the second sampling cylinder (7) extends into the first sampling cylinder (6), and a telescopic mechanism is provided between the first sampling cylinder (6) and the second sampling cylinder (7), a rotating motor (8) is fixed on the upper end of the first sampling cylinder (6), and the rotating motor (8) is located In the machine base (1), a first stirring shaft (9) is fixed to the output shaft end of the rotating motor (8), and a plurality of first crushing knives (10) are fixed to the first stirring shaft (9). A telescopic cavity (25) is opened inside the first stirring shaft (9), and a second stirring shaft is slidably connected in the telescopic cavity (25). A plurality of second crushing knives (12) are slidably connected to the second stirring shaft. The lower end of the second stirring shaft is rotatably connected to a limit seat (23), and the limit seat (23) is fixedly connected to the lower end of the second sampling cylinder (7) through a connecting rod (24). A liquid pump (16) is fixed to the first sampling cylinder (6), and a liquid pumping tube (15) extending into the first sampling cylinder (6) is fixed to the liquid inlet end of the liquid pump (16), and a liquid delivery tube (17) is fixed to the liquid outlet end of the liquid pump (16), and the other end of the liquid delivery tube (17) is fixedly connected to the detection box (3).

2. The rapid detection method for cyanide in industrial wastewater according to claim 1, characterized in that: The reagents required for the mixed solution of o-tolidine and hydrochloric acid are: analytically pure o-tolidine and analytically pure hydrochloric acid.

3. A rapid detection method for cyanide in industrial wastewater according to claim 1, characterized in that, The mixed solution of o-toluidine and hydrochloric acid is prepared by weighing 0.2 g of o-toluidine and dissolving it in 10 ml of 1:4 hydrochloric acid, adding water to 100 ml, and adding 100 ml of 1:4 hydrochloric acid under continuous stirring to prepare a mixed solution.

4. The rapid detection method for cyanide in industrial wastewater according to claim 1, wherein The telescopic mechanism includes a telescopic motor (19), a telescopic slot (18) is provided inside the first sampling tube (6), a telescopic motor (19) is fixed to the bottom of the telescopic slot (18), a threaded rod (20) is fixed to the output shaft end of the telescopic motor (19), a telescopic seat (21) is threadedly connected to the threaded rod (20), the telescopic seat (21) is fixedly connected to the second sampling tube (7), and telescopic covers (22) are fixed to the upper and lower sides of the telescopic seat (21), and the other end of the telescopic cover (22) is fixedly connected to the telescopic cavity (25).

5. A rapid detection method for cyanide in industrial wastewater according to claim 1, characterized in that, A liquid delivery pump (13) is fixed to the upper outer end of the first sampling cylinder (6), a liquid inlet end of the liquid delivery pump (13) is fixedly connected to a telescopic tube (14), the other end of the telescopic tube (14) is communicated with the lower end of the second sampling cylinder (7), and the liquid outlet end of the liquid delivery pump (13) is communicated with the upper part of the first sampling cylinder (6).

6. A rapid detection method for cyanide in industrial wastewater according to claim 1, characterized in that, A plurality of sliding seats (11) are slidably connected to the second stirring shaft, and the second crushing knife (12) is fixedly connected to the sliding seat (11). A plurality of grooves (29) are provided on the inner periphery of the sliding seat (11), and a first spring (30) is fixed inside the groove (29). A limiting block (31) is fixed to the other end of the first spring (30). An unlocking cavity (27) is provided inside the second stirring shaft, and a plurality of limiting holes (32) are provided on the second stirring shaft. One end of the limiting hole (32) is communicated with the unlocking cavity (27), and the other end of the limiting hole (32) corresponds to the groove (29). The limiting block (31) extends into the limiting hole (32). An unlocking rod (26) is fixed in the telescopic cavity (25), and an unlocking assembly is provided in the limiting hole (32). The lower end of the unlocking rod (26) extends into the unlocking cavity (27).

7. A rapid detection method for cyanide in industrial wastewater according to claim 6, characterized in that, A connecting rope (28) is fixed between adjacent sliding seats (11), a connecting rope (28) is also fixed between the lowermost sliding seat (11) and the limiting seat (23), and a connecting rope (28) is fixed between the uppermost sliding seat (11) and the first stirring shaft (9).

8. A rapid detection method for cyanide in industrial wastewater according to claim 6, characterized in that, The unlocking assembly includes a second spring (33), the second spring (33) is fixed in the limiting hole (32), the other end of the second spring (33) is fixed with a triangular seat (34), the lower end of the unlocking rod (26) is provided with a pointed cone portion that cooperates with the triangular seat (34), and one end of the triangular seat (34) located in the limiting hole (32) is fixed with an ejection rod (35), and the ejection rod (35) contacts the limiting block (31).

9. The rapid detection method for cyanide in industrial wastewater according to claim 1, characterized in that: The quantitative liquid discharge mechanism comprises a liquid discharge pipe (40), the upper end of the liquid discharge pipe (40) is connected to the liquid storage tank (5), the lower end of the liquid discharge pipe (40) is connected to the detection box (3), a control valve (42) is provided on the liquid discharge pipe (40), a driving gear (44) is fixed on the valve stem (43) of the control valve (42), an annular buoyancy seat (37) is placed inside the detection box (3), a driving rod (38) is fixed on the annular buoyancy seat (37), a support rod (48) is fixed on the detection box (3), and the support rod (44) is fixed on the detection box (3). 8) is slidably connected to a lifting rod (49), a mounting plate (45) is fixed to the driving rod (38) and the lifting rod (49), an electric telescopic column (46) is fixed to the mounting plate (45), a tooth plate (47) is fixed to the telescopic end of the electric telescopic column (46), a limiting slide rail (39) is fixed to the discharge pipe (40), a limiting slide rail (39) is slidably connected to a limiting slide seat (41), and the driving rod (38) and the lifting rod (49) are fixedly connected to the limiting slide seat (41) through a connecting rod (24).

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