Rapid detection method for cyanide in industrial wastewater

Abstract

The invention provides a rapid detection method for cyanide in industrial wastewater, belongs to the technical field of wastewater detection, and solves the technical problems of non-uniform sampling, low detection accuracy and the like in the prior art. The rapid detection method for the cyanide in the industrial wastewater comprises the following steps: putting 2-(2-toluidine) and hydrochloric acid into a reaction kettle, stirring and mixing, and then feeding into a liquid storage tank of detection equipment for storage; the detection equipment is placed in a wastewater pool, a plurality of sampling assemblies of the detection equipment extend into the bottom of the wastewater pool, part of wastewater is separated in a closed space by the sampling assemblies, and then the wastewater is stirred and crushed; after stirring and crushing are completed, pumping part of wastewater into a detection box by using a water pump; the mixed liquid in the liquid storage tank is fed into the detection tank by using a quantitative liquid discharge mechanism and is mixed with the wastewater; and after standing for 2-5 minutes, observing the color of the liquid in the detection box. The method has the advantages that cyanide is uniformly distributed during sampling, and the detection accuracy is improved.

Description

Technical Field

[0001] The present 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 Technique

[0002] Industrial wastewater refers to the wastewater and waste liquid discharged during the process production, which contains industrial production materials, intermediate products, by-products lost with water, and pollutants generated during the production process. It is an important cause of environmental pollution, especially water pollution. Common industrial wastewater includes cyanide-containing wastewater, etc.

[0003] Cyanide-containing wastewater, that is, wastewater containing cyanide. Cyanides are 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, acetonitrile, etc. The characteristic of cyanide ions is that they are easy to form complexes with certain metals. Nitrile is a compound in which the carbon atom of the hydrocarbon group is connected to the cyanide group, and it has a special odor. During the coal coking process, hydrogen cyanide (HCN) is used to produce polyacrylonitrile fibers, sodium cyanide is used for metal electroplating, ore flotation, and the production of dyes, drugs and plastics. Potassium cyanide is used for the electrolytic refining of platinum, metal coloring, electroplating and pharmaceutical production processes will all produce cyanide-containing wastewater.

[0004] Most of the current detection methods for cyanide-containing wastewater are to sample and then use cyanide detection equipment to detect whether the wastewater exceeds the standard. Not only the investment cost of the detection equipment and the later maintenance cost are high, but also the detection cycle is long, which is not as convenient as on-site detection.

[0005] After retrieval, for example, a Chinese patent document discloses a detection method for rapidly qualitatively testing the cyanide content in wastewater treatment

Application No.: 202011518773.0; Publication No.: CN 112798577A

[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. However, when the wastewater is stored, precipitation will occur, causing some cyanides to precipitate to the bottom. When sampling, only the upper liquid is taken, resulting in the influence on the detection accuracy. Even if a part of the precipitate is taken during sampling, it is impossible to ensure the ratio of the precipitate to the wastewater, and the detection accuracy is limited. Summary of the Invention

[0007] The object of the present invention is to address the above problems existing in the prior art and propose a rapid detection method for cyanides in industrial wastewater. The technical problem to be solved by this invention is: how to achieve uniform distribution of cyanides during sampling and improve the detection accuracy.

[0008] The object of the present invention can be achieved by the following technical solutions:

[0009] A rapid detection method for cyanides in industrial wastewater includes the following steps:

[0010] S1. Put o - tolidine and hydrochloric acid into the reaction kettle, stir and mix them, and then send them into the storage tank of the detection equipment for storage.

[0011] S2. Place the detection equipment in the wastewater pool, extend multiple sampling components of the detection equipment to 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 stirring and crushing are completed, use a water pump to pump part of the wastewater into the detection box.

[0013] S4. Send the mixed liquid in the storage tank into the detection box by using a 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 detection box. If the color of the detection box for cyanide - containing wastewater turns yellow, it indicates that there is excessive cyanide in the wastewater, that is, the dosage of the o - tolidine and hydrochloric acid mixed solution is sufficient to oxidize free and partial complex cyanides, and the cyanide - containing wastewater meets the standard; if the color of the test tube for cyanide - containing wastewater does not show yellow, it indicates that the dosage of the o - tolidine and hydrochloric acid mixed solution is too small, and the cyanide - containing wastewater exceeds the standard.

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

[0016] The preparation method of the mixed solution of o - tolidine and hydrochloric acid is: weigh 0.2 g of o - tolidine, dissolve it in 10 ml of 1:4 hydrochloric acid, add water to 100 ml, and add 100 ml of 1:4 hydrochloric acid under continuous stirring to prepare the mixed solution.

[0017] The equipment used in the steps S1 - S5 is a detection device. The detection device includes a machine base. An airbag is fixed on the outer periphery of the machine base. An air inflation pump is arranged on the airbag. A number of sampling components are arranged on the lower side of the machine base. A detection box is fixed on the upper side of the machine base. An observation window is arranged on the front side of the detection box. A support is fixed on the upper side of the machine base. A liquid storage tank is fixed on the support. A quantitative liquid discharge mechanism is arranged 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 arranged between the first sampling cylinder and the second sampling cylinder. The upper end of the first sampling cylinder is fixed with a rotary motor. The rotary motor is located inside the machine base. The output shaft end of the rotary motor is fixed with a first stirring shaft. A number of first crushing knives are fixed on the first stirring shaft. A telescopic cavity is opened inside the first stirring shaft. A second stirring shaft is slidably connected in the telescopic cavity. A number of second crushing knives are slidably connected on the second stirring shaft. The lower end of the second stirring shaft is rotatably connected with a limit seat. The limit seat is fixedly connected with the lower end of the second sampling cylinder through a connecting rod. A liquid extraction pump is fixed on the first sampling cylinder. The liquid inlet end of the liquid extraction pump is fixed with a liquid extraction pipe extending into the first sampling cylinder. The liquid outlet end of the liquid extraction pump is fixed with a liquid delivery pipe. The other end of the liquid delivery pipe is fixedly connected with the detection box.

[0018] The working principle of the present invention is as follows: During operation, the airbag is inflated by the air inflation pump. Initially, the second sampling cylinder is retracted into the first sampling cylinder. After the equipment is placed at a specified position in the wastewater pool, the telescopic mechanism drives the second sampling cylinder to extend, so that the second sampling cylinder descends until the lower end of the second sampling cylinder contacts the bottom of the wastewater pool. Then the airbag deflates. Then the rotary motor is started. The rotary motor drives the first stirring shaft and the second stirring shaft to rotate, so as to stir the wastewater by using the first crushing knives and the second crushing knives, making the sediment in the wastewater pool rise while using the first crushing knives and the second crushing knives to perform a crushing operation on 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 cylinder and the second sampling cylinder through the liquid extraction pipe, and then sends it into the detection box through the liquid delivery pipe. After a certain amount is extracted, a certain amount of the mixture of o - tolidine and hydrochloric acid is sent into the detection box through the quantitative liquid discharge mechanism. After standing for 2 - 5 minutes, observe the color of the liquid in the detection box. If the color of the detection box for the cyanide - containing wastewater turns yellow, it indicates that there is excessive cyanide in the wastewater, that is, the dosage of the mixture of o - tolidine and hydrochloric acid is sufficient to oxidize free and partial complex cyanide, and the cyanide - containing wastewater meets the standard. If the color of the test tube for the cyanide - containing wastewater does not show yellow, it indicates that the dosage of the mixture of o - tolidine and hydrochloric acid is too small, and the cyanide - containing wastewater exceeds the standard. With the adoption of this structural arrangement, multi - point sampling can be carried out in the wastewater pool, and at the same time, the sediment at the bottom of the wastewater pool can be lifted and crushed, making the pollutants in the wastewater evenly distributed, so that when sampling, the quality of the sampled wastewater is consistent with that in the wastewater pool, thus greatly ensuring the accuracy of the detection.

[0019] The telescopic mechanism includes a telescopic motor. A telescopic groove is formed inside the first sampling cylinder. The telescopic motor is fixed at the bottom of the telescopic groove. 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 cylinder. Telescopic covers are fixed on both the upper and lower sides of the telescopic seat. 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 cylinder to lift and lower, so that the second sampling cylinder can contact the bottom of the wastewater tank during operation, and when storing, the second sampling cylinder can be retracted, which is not only convenient for storage but also more convenient when the device enters and exits the wastewater tank. The setting of the telescopic cover can make the threaded rod located in a closed space, preventing wastewater from contacting the threaded rod and realizing the protection of the threaded rod.

[0021] A liquid delivery pump is fixed to the upper end of the outer side of the first sampling cylinder. The liquid inlet end of the liquid delivery pump is fixedly connected with a telescopic pipe. The other end of the telescopic pipe communicates with the lower end of the second sampling cylinder. The liquid outlet end of the liquid delivery pump communicates with the upper part of the first sampling cylinder.

[0022] With the above structure, while stirring and crushing the wastewater, the liquid delivery pump can be turned on, so that the wastewater at the lower part of the second sampling cylinder is sent into the upper part of the first sampling pipe through the telescopic pipe, so that the wastewater with a higher concentration at the lower part can be mixed with the wastewater with a higher concentration at the upper part, improving the uniformity of the wastewater inside the sampling cylinder and thus ensuring the quality of sampling.

[0023] A number of sliding seats are slidably connected to the second stirring shaft. The second crushing knife is fixedly connected to the sliding seat. A number of grooves are formed in the inner circumference of the sliding seat. A first spring is fixed inside the groove. The other end of the first spring is fixed with a limiting block. An unlocking cavity is formed inside the second stirring shaft. A number of limiting holes are formed in the second stirring shaft. One end of the limiting hole communicates with the unlocking cavity, and the other end of the limiting hole corresponds to the groove. The limiting block extends into the limiting hole. An unlocking rod is fixed inside the telescopic cavity. An unlocking component is arranged in the limiting hole. The lower end of the unlocking rod extends into the unlocking cavity.

[0024] With the above structure, during normal operation, the limiting block is inserted into the limiting 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 components of the upper sliding seats from top to bottom in sequence, so that the unlocking components push out the corresponding limiting blocks, so that the upper sliding seats can be released from the limit of the second stirring shaft, thus preventing the upper sliding seats from interfering with the recovery action of the second stirring shaft.

[0025] A connecting rope is fixed between the adjacent sliding seats, and a connecting rope is also fixed between the lowermost sliding seat and the limit seat, and a connecting rope is fixed between the uppermost sliding seat and the first stirring shaft.

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

[0027] The unlocking assembly includes a second spring fixed in the limiting hole. The other end of the second spring is fixed with a triangular seat. The lower end of the unlocking rod is provided with a tapered portion that cooperates with the triangular seat. A ejecting rod is fixed at one end of the triangular seat located in the limiting hole, and the ejecting rod contacts the limiting block.

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

[0029] The quantitative liquid discharge mechanism includes a liquid discharge pipe. The upper end of the liquid discharge pipe is communicated with the liquid storage tank, and the lower end of the liquid discharge pipe is communicated with the detection tank. A control valve is arranged on the liquid discharge pipe. A driving gear is fixed on the valve stem of the control valve. An annular buoyancy seat is placed inside the detection tank. A driving rod is fixed on the annular buoyancy seat. A support rod is fixed on the detection tank. A lifting rod is slidably connected to the support rod. Mounting plates are fixed on both the driving rod and the lifting rod. An electric telescopic column is fixed on the mounting plate. The telescopic end of the electric telescopic column is fixed with a toothed plate. A limiting slide rail is fixed on the liquid discharge pipe. A limiting slide seat is slidably connected to the limiting slide rail. Both the driving rod and the lifting rod are fixedly connected to the limiting slide seat through connecting rods.

[0030] With the above structure, when adding waste water into the detection tank, under the action of buoyancy, the annular buoyancy seat moves upward, and the two toothed plates rise. After the left toothed plate rises to a certain position, it meshes with the driving gear, thereby driving the driving gear to rotate, opening the control valve, and enabling the mixture of o-toluidine and hydrochloric acid in the liquid storage tank to enter the detection tank. When the mixture of o-toluidine and hydrochloric acid is added, the annular buoyancy seat continues to rise, and the left toothed plate disengages from the driving gear. Under the action of the connecting rod and the lifting rod, the right toothed plate continues to rise. After the mixture of o-toluidine and hydrochloric acid is added to a certain extent, the right toothed plate meshes with the driving gear, driving the driving gear to reverse, thereby closing the control valve and stopping the liquid addition, realizing the work of quantitative liquid addition. The degree of automation is high, no manual control is required, no measuring elements are needed, the failure rate is low, and when it needs to return to the original position, the electric telescopic column drives the toothed plate to move, so that the toothed plate does not mesh with the driving gear, and the return operation can be carried out, and the operation is simple and convenient.

[0031] Compared with the prior art, the rapid detection method for cyanide in industrial wastewater has the following advantages:

[0032] 1. By using the detection method of the present invention, when sampling, the cyanide in the wastewater can be evenly distributed, ensuring the accuracy of sampling, thereby guaranteeing the accuracy of detection. At the same time, it is not necessary to disturb all the wastewater in the wastewater tank, reducing the detection cost and difficulty. At the same time, by adopting the method of multi-point sampling, the accuracy of detection can be further guaranteed.

[0033] 2. During operation, the airbag is inflated by an air pump. Initially, the second sampling cylinder is retracted into the first sampling cylinder. After the device is placed at a designated position in the wastewater tank, the telescopic mechanism drives the second sampling cylinder to extend, so that the second sampling cylinder descends until the lower end of the second sampling cylinder contacts the bottom of the wastewater tank. Then the airbag deflates, and then the rotary motor is started. The rotary 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, causing the sediment in the wastewater tank to be lifted while using the first crushing knife and the second crushing knife to crush the particles. After crushing for a period of time, the liquid extraction pump extracts the waste liquid from the closed space formed by the first sampling cylinder and the second sampling cylinder through the liquid extraction pipe, and then sends it into the detection box through the liquid delivery pipe. After extracting a certain amount, a certain amount of the mixture of o-toluidine and hydrochloric acid is sent into the detection box through the quantitative liquid discharge mechanism. After standing for 2 - 5 minutes, observe the color of the liquid in the detection box. If the color of the detection box for the wastewater containing cyanide turns yellow, it indicates that the wastewater contains excessive cyanide, that is, the dosage of the mixture of o-toluidine and hydrochloric acid is sufficient to oxidize free and partial complex cyanide, and the wastewater containing cyanide meets the standard; if the color of the test tube for the wastewater containing cyanide does not show yellow, it indicates that the dosage of the mixture of o-toluidine and hydrochloric acid is too small, and the wastewater containing cyanide exceeds the standard. By adopting this structural arrangement, multi-point sampling can be carried out in the wastewater tank, and at the same time, the sediment at the bottom of the wastewater tank can be lifted and crushed, making the pollutants in the wastewater evenly distributed, so that when sampling, the quality of the sample wastewater is consistent with that in the wastewater tank, thus greatly ensuring the accuracy of detection.

[0034] 3. While stirring and crushing the wastewater, the liquid delivery pump can be turned on, so that the wastewater at the lower part of the second sampling cylinder is sent into the upper part of the first sampling pipe through the telescopic pipe, thereby enabling the wastewater with a higher concentration at the lower part to be mixed with the wastewater with a higher concentration at the upper part, improving the uniformity of the wastewater inside the sampling cylinder, and thus ensuring the quality of sampling.

[0035] 4. During normal operation, the limit block is inserted into the limit hole to limit the sliding seat, enabling the second crushing knife to operate properly. When the second sampling cylinder moves into the first sampling cylinder, the unlocking rod contacts the unlocking components of the upper sliding seat from top to bottom in sequence, causing the unlocking components to eject the corresponding limit block, so that the upper sliding seat can be disengaged from the limit of 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 unfolds, under the action of the connecting rope, the sliding seat can move back to the initial position, so that the limit block can re-enter the limit hole to limit the sliding seat.

[0037] 6. When adding wastewater into the detection box, under the action of buoyancy, the annular buoyancy seat moves upward, and the two toothed plates rise. After the left toothed plate rises to a certain position, it meshes with the driving gear, thereby driving the driving gear to rotate, opening the control valve, and enabling the mixture of o-toluidine and hydrochloric acid in the liquid storage tank to enter the detection box. When the mixture of o-toluidine and hydrochloric acid is added, the annular buoyancy seat continues to rise, and the left toothed plate disengages from the driving gear. Under the action of the connecting rod and the lifting rod, the right toothed plate continues to rise. After the mixture of o-toluidine and hydrochloric acid is added to a certain extent, the right toothed plate meshes with the driving gear, driving the driving gear to reverse, thereby closing the control valve and stopping the liquid addition, realizing the work of quantitative liquid addition. The degree of automation is high, without the need for manual control or measuring elements, and the failure rate is low. When returning to the original position is required, the electric telescopic column drives the toothed plate to move, so that the toothed plate does not mesh with the driving gear, and the return operation can be performed, and the operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0041] Figure 4 is Figure 3 the partial enlarged view at B in

[0042] Figure 5 is Figure 3 the partial enlarged view at A in

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

[0044] Figure 7 Figure 6 the partial enlarged view at C in

[0045] Figure 8 is a schematic structural view of the quantitative liquid discharging assembly in the present invention.

[0046] Figure 9 is a schematic installation structure view of the toothed plate in the present invention.

[0047] In the figure, 1 is the machine base; 2 is the sampling assembly; 3 is the detection box; 4 is the bracket; 5 is the liquid storage tank; 6 is the first sampling cylinder; 7 is the second sampling cylinder; 8 is the rotation motor; 9 is the first stirring shaft; 10 is the first crushing knife; 11 is the sliding seat; 12 is the second crushing knife; 13 is the liquid delivery pump; 14 is the telescopic pipe; 15 is the liquid suction pipe; 16 is the liquid suction pump; 17 is the liquid delivery pipe; 18 is the telescopic groove; 19 is the telescopic motor; 20 is the threaded rod; 21 is the telescopic seat; 22 is the telescopic cover; 23 is the limit seat; 24 is the connecting rod; 25 is the telescopic cavity; 26 is the unlocking rod; 27 is the unlocking cavity; 28 is the connecting rope; 29 is the groove; 30 is the first spring; 31 is the limit block; 32 is the limit hole; 33 is the second spring; 34 is the triangular seat; 35 is the ejecting rod; 36 is the observation window; 37 is the annular buoyancy seat; 38 is the driving rod; 39 is the limit sliding rail; 40 is the liquid discharge pipe; 41 is the limit sliding seat; 42 is the control valve; 43 is the valve rod; 44 is the driving gear; 45 is the mounting plate; 46 is the electric telescopic column; 47 is the toothed plate; 48 is the support rod; 49 is the lifting rod. Detailed implementation manners

[0048] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0049] As Figures 1-9 shown, the rapid detection method for cyanide in industrial wastewater of the present invention includes the following steps:

[0050] S1. Put o - tolidine and hydrochloric acid into the reaction kettle, stir and mix them, and then send them into the liquid storage tank 5 of the detection equipment for storage;

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

[0052] S3. After the stirring and crushing are completed, use a water pump to pump part of the wastewater into the detection box 3;

[0053] S4. Send the mixed liquid in the liquid storage tank 5 into the detection box 3 by using the quantitative liquid discharging mechanism to mix with the wastewater;

[0054] S5. After standing still 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 indicates that there is excessive cyanide in the wastewater, that is, the dosage of the mixture of o-tolidine and hydrochloric acid is sufficient to oxidize free and partial 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 mixture of o-tolidine and hydrochloric acid is too small, and the cyanide-containing wastewater exceeds the standard.

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

[0056] The preparation method of the mixed solution of o-tolidine and hydrochloric acid is: weigh 0.2 g of o-tolidine and dissolve it in 10 ml of 1:4 hydrochloric acid, add water to 100 ml, and add 100 ml of 1:4 hydrochloric acid while stirring continuously to obtain the mixed solution.

[0057] The equipment used in the steps S1 - S5 is detection equipment. The detection equipment includes a machine base 1. An airbag is fixed on the outer periphery of the machine base 1, and an air pump is arranged on the airbag. A number of sampling components 2 are arranged 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 arranged on the front side of the detection box 3. A support 4 is fixed on the upper side of the machine base 1. A liquid storage tank 5 is fixed on the support 4. A quantitative liquid discharge mechanism is arranged 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 arranged between the first sampling cylinder 6 and the second sampling cylinder 7. A rotary motor 8 is fixed at the upper end of the first sampling cylinder 6. The rotary motor 8 is located inside the machine base 1. The output shaft end of the rotary motor 8 is fixed with a first stirring shaft 9. 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. 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 with a limit seat 23. The limit seat 23 is fixedly connected with the lower end of the second sampling cylinder 7 through a connecting rod 24. A liquid extraction pump 16 is fixed on the first sampling cylinder 6. The liquid inlet end of the liquid extraction pump 16 is fixed with a liquid extraction pipe 15 extending into the first sampling cylinder 6. The liquid outlet end of the liquid extraction pump 16 is fixed with a liquid delivery pipe 17. The other end of the liquid delivery pipe 17 is fixedly connected with the detection box 3.

[0058] With the above structure, during operation, the airbag is inflated using an air pump. Initially, the second sampling cylinder 7 is retracted into the first sampling cylinder 6. After placing the device at a designated position in the wastewater tank, the telescopic mechanism drives the second sampling cylinder 7 to extend, causing the second sampling cylinder 7 to descend until the lower end of the second sampling cylinder 7 contacts the bottom of the wastewater tank. Then, the airbag deflates. Next, the rotary motor 8 is started, and the rotary motor 8 drives the first stirring shaft 9 and the second stirring shaft to rotate. Thereby, the wastewater is agitated using the first crushing knife 10 and the second crushing knife 12, causing the sediment inside the wastewater tank to be lifted while the first crushing knife 10 and the second crushing knife 12 perform a crushing operation on 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 cylinder 6 and the second sampling cylinder 7 through the liquid extraction pipe 15, and then sends it into the detection box 3 through the liquid delivery pipe 17. After extracting a certain amount, a certain amount of the mixture of o - tolidine and hydrochloric acid is sent into the detection box 3 through the quantitative liquid 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 detection box 3 for cyanide - containing wastewater turns yellow, it indicates that the wastewater contains excessive cyanide, that is, the dosage of the mixture of o - tolidine 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 test tube for cyanide - containing wastewater does not show yellow, it indicates that the dosage of the mixture of o - tolidine 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 tank, and at the same time, the sediment at the bottom of the wastewater tank can be lifted and crushed, making the pollutants in the wastewater evenly distributed. Thus, when sampling, the quality of the sample wastewater is consistent with that in the wastewater tank, greatly ensuring the accuracy of the detection.

[0059] The telescopic mechanism includes a telescopic motor 19. A telescopic groove 18 is formed inside the first sampling cylinder 6. The telescopic motor 19 is fixed to the bottom of the telescopic groove 18. The output shaft end of the telescopic motor 19 is fixed with a threaded rod 20. A telescopic seat 21 is threadedly connected to the threaded rod 20. The telescopic seat 21 is fixedly connected to the second sampling cylinder 7. Telescopic covers 22 are fixed on both the upper and lower sides of the telescopic seat 21. 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 cylinder 7 to rise and fall, enabling the second sampling cylinder 7 to contact the bottom of the wastewater tank during operation. When storing, the second sampling cylinder 7 can be retracted, which is not only convenient for storage but also makes it more convenient for the device to enter and exit the wastewater tank. The setting of the telescopic cover 22 can keep the threaded rod 20 in a closed space, preventing the wastewater from contacting the threaded rod 20 and protecting the threaded rod 20.

[0061] A liquid delivery pump 13 is fixedly installed at the upper end of the outer side of the first sampling cylinder 6. The liquid inlet end of the liquid delivery pump 13 is fixedly connected with a telescopic pipe 14. The other end of the telescopic pipe 14 communicates with the lower end of the second sampling cylinder 7. The liquid outlet end of the liquid delivery pump 13 communicates with the upper part of the first sampling cylinder 6.

[0062] With the above structure, while stirring and pulverizing the wastewater, the liquid delivery pump 13 can be turned on, so that the wastewater at the lower part of the second sampling cylinder 7 is sent into the upper part of the first sampling pipe through the telescopic pipe 14, so that the wastewater with a higher concentration at the lower part can be mixed with the wastewater with a higher concentration at the upper part, improving the uniformity of the wastewater inside the sampling cylinder, and thus ensuring the quality of sampling.

[0063] A plurality of sliding seats 11 are slidably connected to the second stirring shaft. The second pulverizing knife 12 is fixedly connected with the sliding seat 11. A plurality of grooves 29 are formed in the inner circumference of the sliding seat 11. A first spring 30 is fixedly installed inside the groove 29. The other end of the first spring 30 is fixedly connected with a limiting block 31. An unlocking cavity 27 is formed inside the second stirring shaft. A plurality of limiting holes 32 are formed in the second stirring shaft. One end of the limiting hole 32 communicates with the unlocking cavity 27. 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 fixedly installed inside the telescopic cavity 25. An unlocking component is arranged inside the limiting hole 32. The lower end of the unlocking rod 26 extends into the unlocking cavity 27.

[0064] With the above structure, during normal operation, the limiting block 31 is inserted into the limiting hole 32 to limit the sliding seat 11, so that the second pulverizing knife 12 can work normally. When the second sampling cylinder 7 moves towards the first sampling cylinder 6, the unlocking rod 26 contacts the unlocking components of the upper sliding seats 11 from top to bottom in sequence, so that the unlocking components push out the corresponding limiting blocks 31, so that the upper sliding seats 11 can be released from the limitation of the second stirring shaft, thus preventing the upper sliding seats 11 from interfering with the recovery action of the second stirring shaft.

[0065] Connecting ropes 28 are fixedly connected between adjacent sliding seats 11. A connecting rope 28 is also fixedly connected between the lowermost sliding seat 11 and the limiting seat 23. A connecting rope 28 is fixedly connected between the uppermost sliding seat 11 and the first stirring shaft 9.

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

[0067] The unlocking component includes a second spring 33, which 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 tapered portion that cooperates with the triangular seat 34. One end of the triangular seat 34 located in the limiting hole 32 is fixed with an ejecting rod 35, and the ejecting rod 35 contacts the limiting block 31.

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

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

[0070] With the above structure, when adding waste water into the detection tank 3, under the action of buoyancy, the annular buoyancy seat 37 moves upward, and the two toothed plates 47 rise. After the left toothed plate 47 rises to a certain position, it meshes with the driving gear 44, thereby driving the driving gear 44 to rotate, causing the control valve 42 to open, and enabling the mixture of o-toluidine and hydrochloric acid in the liquid storage tank 5 to enter the detection tank 3. When the mixture of o-toluidine and hydrochloric acid is added, the annular buoyancy seat 37 continues to rise, and the left toothed plate 47 disengages from the driving gear 44. Under the action of the connecting rod 24 and the lifting rod 49, the right toothed plate 47 continues to rise. After the mixture of o-toluidine and hydrochloric acid is added to a certain extent, the right toothed plate 47 meshes with the driving gear 44, driving the driving gear 44 to reverse, thereby causing the control valve 42 to close and stop adding liquid, realizing the work of quantitative liquid addition. The degree of automation is high, no manual control is required, no measuring element is needed, and the failure rate is low. When returning to the original position is required, the electric telescopic column 46 drives the toothed plate 47 to move, so that the toothed plate 47 does not mesh with the driving gear 44, and the return operation can be carried out. The operation is simple and convenient.

[0071] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A rapid detection method for cyanide in industrial wastewater, characterized in that: The following steps are involved: S1, putting o-toluidine and hydrochloric acid into a reaction kettle, stirring and mixing, and then sending them into a liquid storage tank (5) of a detection device 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 stirring and crushing is completed, a part of the waste water 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 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 dosage of the mixed solution of o-toluidine and hydrochloric acid 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 dosage of the mixed solution of o-toluidine and hydrochloric acid is too small, and the cyanide-containing wastewater exceeds the standard.

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 preparation method of the mixed solution of o-toluidine and hydrochloric acid is as follows: weigh 0.2 g of o-toluidine and dissolve it in 10 ml of 1:4 hydrochloric acid, add water to 100 ml, and add 100 ml of 1:4 hydrochloric acid under constant stirring to obtain a mixed solution.

4. A rapid detection method for cyanide in industrial wastewater according to claim 1, characterized in that: The equipment used in the steps S1-S5 is a detection equipment, which comprises a machine base (1), an air bag is fixed on the outer periphery of the machine base (1), an air pump is arranged on the air bag, a plurality of sampling components (2) are arranged 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 arranged 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 box (5) is fixed on the bracket (4), a quantitative liquid discharge mechanism is arranged between the liquid storage box (5) and the detection box (3), the sampling component (2) comprises 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 arranged 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), a plurality 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), a second stirring shaft is slidably connected in the telescopic cavity (25), a plurality 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), the limit seat (23) is fixedly connected to the lower end of the second sampling tube (7) through a connecting rod (24), a liquid pump (16) is fixed to the first sampling tube (6), a liquid inlet end of the liquid pump (16) is fixed with a liquid pumping tube (15) extending into the first sampling tube (6), a liquid outlet end of the liquid pump (16) is fixed with a liquid delivery tube (17), and the other end of the liquid delivery tube (17) is fixedly connected to the detection box (3).

5. A rapid detection method for cyanide in industrial wastewater according to claim 4, characterized in that: The telescopic mechanism comprises a telescopic motor (19), a telescopic groove (18) is provided inside the first sampling tube (6), a telescopic motor (19) is fixed at the bottom of the telescopic groove (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), a telescopic cover (22) is 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).

6. A rapid detection method for cyanide in industrial wastewater according to claim 4, 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 connected to the lower end of the second sampling cylinder (7); and the liquid outlet end of the liquid delivery pump (13) is connected to the upper part of the first sampling cylinder (6).

7. A rapid detection method for cyanide in industrial wastewater according to claim 4, characterized in that: A plurality of sliding seats (11) are slidably connected to the second stirring shaft, the second crushing knife (12) is fixedly connected to the sliding seat (11), a plurality of grooves (29) are provided on the inner circumference of the sliding seat (11), 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, 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), 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), an unlocking assembly is arranged in the limiting hole (32), and the lower end of the unlocking rod (26) extends into the unlocking cavity (27).

8. A rapid detection method for cyanide in industrial wastewater according to claim 7, 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).

9. The rapid detection method for cyanide in industrial wastewater according to claim 7, characterized in that: The unlocking assembly comprises a second spring (33), the second spring (33) is fixed in the limiting hole (32), a triangular seat (34) is fixed to the other end of the second spring (33), a pointed cone portion cooperating with the triangular seat (34) is arranged at the lower end of the unlocking rod (26), 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) contacts the limiting block (31).

10. The rapid detection method for cyanide in industrial wastewater according to claim 4, 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 box (5), the lower end of the liquid discharge pipe (40) is connected to the detection box (3), a control valve (42) is arranged 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 with a lifting rod (49), a mounting plate (45) is fixed on the driving rod (38) and the lifting rod (49), an electric telescopic column (46) is fixed on the mounting plate (45), a tooth plate (47) is fixed on the telescopic end of the electric telescopic column (46), a limiting slide rail (39) is fixed on the discharge pipe (40), a limiting slide seat (41) is slidably connected on the limiting slide rail (39), 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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