Purification device and purification method for producing thiourea

Abstract

The invention provides a purification device and a purification method for producing thiourea, and relates to the field of thiourea purification. The device comprises a bottom plate, the upper surface of the bottom plate is fixedly connected with a dissolving device, the upper surface, close to the right end, of the bottom plate is fixedly connected with an impurity removal device, a first pipeline is fixedly connected between the dissolving device and the impurity removal device, and the first pipeline is communicated with the dissolving device and the impurity removal device; a cleaning device is arranged on the upper surface, close to the front side, of the bottom plate. The spray thrower arranged in the fixed plate is used for spraying conveyed water flow out to clean the thiourea crystal, and the eccentric wheel is arranged to drive the movable plate to shake to conduct shaking and turning-over operation on the thiourea crystal, so that the thiourea crystal is efficiently cleaned. The obliquely arranged moving plate can shake the thiourea crystals to the left end and move the thiourea crystals out through a sliding outlet, so that the thiourea crystals are conveniently collected, and cleaning water flow is moved into the dissolving tank through the arranged water tank to be partially recycled.

Description

Technical Field

[0001] The invention relates to the technical field of thiourea purification, in particular to a purification device and a purification method for producing thiourea. Background Art

[0002] Thiourea is an organic compound with a chemical structure of CS(NH2)2. It is a product obtained by the reaction of thiocyanic acid and urea. Thiourea is easily soluble in water, presents as colorless crystals, and has a structure similar to urea. It is a compound with bifunctional groups, containing both thiocyanate groups and urea groups, so it has strong coordination and metal complexing ability. It is mainly used as a chemical reagent, such as a catalyst, metal corrosion inhibitor, and reducing agent for dyes. In the agricultural field, thiourea can be used as a plant growth regulator to help improve the yield and quality of crops. In the medical field, it is sometimes used as a drug intermediate. Used in photosensitive materials, electroplating processes, etc., thiourea, as a multifunctional compound, has a wide range of applications and chemical properties, and plays an important role in different industries.

[0003] In the production process of thiourea, other substances or reaction by-products are often generated. These impurities will affect the purity and performance of thiourea. Especially in the fields of medicine and electronics, it is necessary to ensure that thiourea does not contain impurities that are harmful to the application. Therefore, it is often necessary to purify thiourea. In the existing thiourea purification equipment, after purifying thiourea, thiourea will be placed in a bucket filled with clean water for washing. The water after washing will be poured out and directly stored and transported to the sewage treatment plant. However, it is wasteful to directly transport some thiourea residues in the washing water to the sewage treatment plant for treatment, and such washing wastes water resources. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the shortcomings of the prior art, the present invention provides a purification device and a purification method for producing thiourea, which solves the problem that the water containing some thiourea residues during cleaning is directly transported to a sewage plant for treatment, which is wasteful and the cleaning method wastes water resources.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a purification device and purification method for producing thiourea, comprising a bottom plate, a dissolving device is fixedly connected to the upper surface of the bottom plate, a de-impurity device is fixedly connected to the upper surface of the bottom plate near the right end, a first pipeline is fixedly connected between the dissolving device and the de-impurity device, the first pipeline is connected with the dissolving device and the de-impurity device, a cleaning device is arranged on the upper surface of the bottom plate near the front side, a crystallization device is arranged on the upper surface of the cleaning device, a placement groove is arranged on the upper surface of the bottom plate near the cleaning device, a second pipeline is fixedly connected between the crystallization device and the de-impurity device, the second pipeline is connected with the crystallization device and the de-impurity device.

[0008] Preferably, the cleaning device includes a fixed block, an eccentric wheel, a connecting rod, a connecting block, a movable plate, a sliding block, a limiting long plate, a first water filter hole, a sliding outlet and a water tank, the fixed block is fixedly connected to the upper surface of the bottom plate, the inner surface of the fixed block is fixedly connected to the first motor, the eccentric wheel is fixedly connected to the output end of the first motor, the lower surface of the connecting rod is fixedly connected to the first movable pin, the connecting rod is movably connected to the upper surface of the eccentric wheel near the edge through the first movable pin, the inner surface of the connecting block is rotatably connected to the second movable pin, and the left end of the connecting rod is movably connected to the inner surface of the connecting block through the second movable pin.

[0009] Preferably, the left end of the connecting block is fixedly connected to the right side surface of the movable plate, the sliding block is fixedly connected to the front and rear sides of the movable plate, the first water filter hole is opened on the bottom surface of the movable plate, the sliding outlet is opened on the upper surface at the left end edge of the movable plate, the movable plate is slidably connected to the inner surface of the limiting long plate through the sliding block, the limiting long plate is fixedly connected to the upper surface of the bottom plate near the two sides of the placement groove, and the movable plate is inclinedly arranged on the side surface of the limiting long plate.

[0010] Preferably, the dissolution device includes a dissolution tank, a first shell, a first stirring rod, a first stirring blade, an upstream blade, a first water pump, a water inlet pipe and a second water pump, the lower surface of the dissolution tank is fixedly connected to the upper surface of the base plate, the first shell is fixedly connected to the upper surface of the dissolution tank, a second motor is fixedly connected inside the first shell, and an electric heating device is provided on the inner surface of the bottom of the dissolution tank.

[0011] Preferably, the upper end of the first stirring rod passes through the dissolution tank and is fixedly connected to the output end of the second motor, the first stirring blade is fixedly connected to the side surface of the first stirring rod, the upstream blade is fixedly connected to the side surface of the lower end of the first stirring rod, and the second water pump is fixedly connected to the inner surface of the water inlet pipe.

[0012] Preferably, the second water pump is fixedly connected to the upper surface of the base plate, the upper end of the water inlet pipe is fixedly connected to the inner surface of the dissolution tank, the first water pump is fixedly connected to the right inner surface of the dissolution tank, the first pipe is fixedly connected to the inner surface of the first water pump, and the first pipe is connected to the dissolution tank.

[0013] Preferably, the impurity removal device includes an impurity removal shell, a stretching plate, a handle, a sliding plate and a second water filter hole. The lower end of the impurity removal shell is fixedly connected to the upper surface of the bottom plate, the sliding plate is fixedly connected to the side surface of the stretching plate, the handle is fixedly connected to the rear surface of the stretching plate, the stretching plate is slidably connected to the inner surface of the impurity removal shell through the sliding plate, the second water filter hole is opened on the lower surface of the stretching plate, filter cotton is installed on the inner side of the stretching plate, and the impurity removal shell is fixedly connected to a third water pump near the lower end and located at the position of the second pipeline.

[0014] Preferably, the crystallization device includes a second shell, a temperature-controlled water tank, a second stirring rod, a second stirring blade, a propulsion blade, a fixed plate and a crystallization tank, the fixed plate is fixedly connected to the upper surface of the limiting long plate, the conical plate is fixedly connected to the inner surface of the fixed plate, the crystallization tank is fixedly connected to the upper surface of the conical plate, the second shell is fixedly connected to the upper surface of the crystallization tank, the temperature-controlled water tank is fixedly connected to the annular surface of the crystallization tank, the inner surface of the second shell is fixedly connected with a third motor, and the second stirring rod passes through the crystallization tank and is fixedly connected to the output end of the third motor.

[0015] Preferably, the propulsion blade is fixedly connected to the side surface of the second stirring rod, the propulsion blade contacts the inner side of the conical plate, the second stirring blade is fixedly connected to the side surface of the second stirring rod at the upper end of the propulsion blade, a sprayer is provided on the inner side of the fixed plate near the conical plate, the right end of the sprayer is fixedly connected to a water inlet, water pipes are respectively provided at the upper and lower ends of the temperature control water tank, and an electric valve is provided at the lower end of the conical plate.

[0016] Working principle: thiourea and water are placed in a dissolving tank and the first motor is started to drive the first stirring rod to rotate. The first stirring blade stirs the liquid, and the electric heating device is started to heat the liquid. The upstream blade stirs the settled thiourea to the upper end to quickly heat the liquid and accelerate the dissolution. The dissolved liquid is then transported to the impurity removal shell through the first pipe by the first water pump and flows into the stretching plate. The liquid is filtered through the filter cotton arranged thereon to filter out the impurities therein, and then flows downward through the second filter hole. The third water pump transports the filtered liquid to the middle. The temperature-controlled water tank is externally connected to a temperature-controlling device. The temperature-controlling device transports the water after temperature adjustment from the water pipe at the lower end of the temperature-controlled water tank to the temperature-controlled water tank. After the temperature-controlled water tank is filled, it flows out from the water pipe at the upper end to the temperature-controlling device for continuous circulation to control the temperature in the crystallization tank. At the same time, The third motor is started to drive the second stirring blade and the propulsion blade to rotate, driving the liquid to accelerate cooling, thereby precipitating the thiourea crystals therein, starting the electric valve to open the opening, and the precipitated crystals are continuously pressed downward by the rotation of the propulsion blade, and flow into the movable plate from the opening, and the liquid flows into the water tank below through the first water filter hole, and the first motor is started to drive the fixed block to rotate, and the eccentric wheel rotates to drive the movable plate to move continuously, and at the same time, the water delivery equipment externally connected to the water inlet is started to deliver water to the sprayer, and the sprayer sprays water to the thiourea crystals to clean them, and the cleaning water will flow into the water tank through the first water filter hole, and the thiourea crystals will slide onto the placement tank through the sliding outlet under the continuous movement of the movable plate, and then be collected, and the second water pump will deliver part of the liquid collected in the water tank to the dissolution tank through the water inlet pipe to dissolve the thiourea therein, and the remaining part of the liquid will be reserved for use in the next dissolution to reduce waste.

[0017] (III) Beneficial effects

[0018] The present invention provides a purification device and a purification method for producing thiourea, which have the following beneficial effects:

[0019] 1. The upflow blades are tilted to stir the thiourea and heated water at the bottom of the dissolution tank to the upper end to fully dissolve them.

[0020] 2. By setting a stretching plate in the impurity removal crystal, when a large amount of impurities are stored, the stretching plate can be pulled out to replace the filter cotton therein, thereby achieving a quick replacement effect.

[0021] 3. The temperature is controlled by pouring water with adjusted temperature into the temperature-controlled water tank from the water pipe at the lower end of the temperature-controlled water tank and circulating it out from the water pipe at the upper end of the temperature-controlled water tank to facilitate the precipitation of thiourea crystals. The propulsion blades set will press down the thiourea crystals when rotating, making it easier to discharge the thiourea crystals.

[0022] 4. The water flow delivered is sprayed out through the sprayer arranged in the fixed plate to clean the thiourea crystals, and the eccentric wheel arranged drives the movable plate to shake and turn over the thiourea crystals, so as to efficiently clean the thiourea crystals. The inclined movable plate will shake the thiourea crystals to the left end and move them out through the sliding outlet for easy collection. The cleaning water flow is moved to the dissolution tank through the arranged water tank for partial recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of a purification device and a purification method for producing thiourea proposed by the present invention;

[0024] Figure 2 A rear view of a purification device and a purification method for producing thiourea proposed by the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of a purification device and a purification method for producing thiourea proposed by the present invention;

[0026] Figure 4 This is a schematic structural diagram of a cleaning device for producing thiourea and a purification method proposed by the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of a dissolving device for producing thiourea and a purification method proposed by the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of an impurity removal device for a purification device and a purification method for producing thiourea proposed by the present invention;

[0029] Figure 7 The present invention provides a schematic structural diagram of a crystallization device for producing thiourea using a purification device and a purification method.

[0030] Among them, 1. bottom plate; 2. placement tank; 3. cleaning device; 301. fixed block; 302. eccentric wheel; 303. connecting rod; 304. connecting block; 305. moving plate; 306. sliding block; 307. limiting long plate; 308. first water filter hole; 309. sliding outlet; 310. water tank; 4. dissolving device; 401. dissolving tank; 402. first shell; 403. first stirring rod; 404. first stirring blade; 405. upstream blade; 406. first water pump ; 407, water inlet pipe; 408, second water pump; 5, impurity removal device; 501, impurity removal shell; 502, stretching plate; 503, handle; 504, sliding plate; 505, second water filter hole; 6, crystallization device; 601, second shell; 602, temperature-controlled water tank; 603, second stirring rod; 604, second stirring blade; 605, propulsion blade; 606, fixed plate; 607, crystallization tank; 608, conical plate; 7, first pipeline; 8, second pipeline; 9, water inlet. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1-7 As shown, an embodiment of the present invention provides a purification device and a purification method for producing thiourea, comprising a bottom plate 1, a dissolving device 4 is fixedly connected to the upper surface of the bottom plate 1, a de-impurity device 5 is fixedly connected to the upper surface of the bottom plate 1 near the right end, a first pipe 7 is fixedly connected between the dissolving device 4 and the de-impurity device 5, the first pipe 7 is communicated with the dissolving device 4 and the de-impurity device 5, a cleaning device 3 is arranged on the upper surface of the bottom plate 1 near the front side, a crystallization device 6 is arranged on the upper surface of the cleaning device 3, a placement groove 2 is arranged on the upper surface of the bottom plate 1 near the cleaning device 3, a second pipe 8 is fixedly connected between the crystallization device 6 and the de-impurity device 5, the second pipe 8 is communicated with the crystallization device 6 and the de-impurity device 5, and the thiourea placed on the placement groove 2 can be collected by a scraper or other tool.

[0033] The cleaning device 3 includes a fixed block 301, an eccentric wheel 302, a connecting rod 303, a connecting block 304, a movable plate 305, a sliding block 306, a limiting long plate 307, a first water filter hole 308, a sliding outlet 309 and a water tank 310. The fixed block 301 is fixedly connected to the upper surface of the bottom plate 1, the inner surface of the fixed block 301 is fixedly connected to the first motor, the eccentric wheel 302 is fixedly connected to the output end of the first motor, the lower surface of the connecting rod 303 is fixedly connected to the first movable pin, the connecting rod 303 is movably connected to the upper surface of the eccentric wheel 302 near the edge through the first movable pin, and the inner surface of the connecting block 304 is rotatably connected to the second movable pin. Pin, the left end of the connecting rod 303 is movably connected to the inner surface of the connecting block 304 through a second movable pin, the left end of the connecting block 304 is fixedly connected to the right side surface of the movable plate 305, the sliding block 306 is fixedly connected to the front and rear sides of the movable plate 305, the first water filter hole 308 is opened on the bottom surface of the movable plate 305, the sliding outlet 309 is opened on the upper surface at the left end edge of the movable plate 305, the movable plate 305 is slidably connected to the inner surface of the limiting long plate 307 through the sliding block 306, the limiting long plate 307 is fixedly connected to the upper surface of the bottom plate 1 near the two sides of the placement groove 2, and the movable plate 305 is inclinedly arranged on the side surface of the limiting long plate 307.

[0034] The first motor is started to drive the fixed block 301 to rotate, and the eccentric wheel 302 rotates to drive the movable plate 305 to move continuously. At the same time, the water delivery device connected to the water inlet 9 is started to deliver water to the sprayer. The sprayer is connected to a water faucet. The sprayer sprays water to the thiourea crystals to clean them. The cleaning water will flow into the water tank 310 through the first water filter hole 308. The thiourea crystals will slide onto the placement tank 2 through the sliding outlet 309 under the continuous movement of the movable plate 305. The water in the water tank 310 will be delivered to the dissolution tank 401 for recycling through the action of the second water pump 408, and the circulation can also be stopped and adjusted automatically.

[0035] The dissolving device 4 includes a dissolving tank 401, a first shell 402, a first stirring rod 403, a first stirring blade 404, an upstream blade 405, a first water pump 406, a water inlet pipe 407 and a second water pump 408. The lower surface of the dissolving tank 401 is fixedly connected to the upper surface of the bottom plate 1, the first shell 402 is fixedly connected to the upper surface of the dissolving tank 401, the first shell 402 is fixedly connected to the upper surface of the dissolving tank 401, the first shell 402 is fixedly connected to the second motor, the inner surface of the bottom of the dissolving tank 401 is provided with an electric heating device, the upper end of the first stirring rod 403 passes through the dissolving tank 401 and is fixedly connected to the output end of the second motor, the first stirring blade 404 is fixedly connected to the side surface of the first stirring rod 403, and the upstream blade 405 is fixedly connected to the upper surface of the bottom plate 1. The first stirring rod 403 is fixedly connected to the side surface of the lower end of the first stirring rod 403, the second water pump 408 is fixedly connected to the inner surface of the water inlet pipe 407, the second water pump 408 is fixedly connected to the upper surface of the bottom plate 1, the upper end of the water inlet pipe 407 is fixedly connected to the inner surface of the dissolution tank 401, the first water pump 406 is fixedly connected to the right inner surface of the dissolution tank 401, the first pipeline 7 is fixedly connected to the inner surface of the first water pump 406, the first pipeline 7 is connected to the dissolution tank 401, the dissolution tank 401 is connected to a pipeline for conveying raw materials, the upstream blades 405 stir the settled thiourea to the upper end to quickly heat the liquid and accelerate the dissolution, and the rotation direction of the upstream blades 405 is the direction that drives the water flow to move upward.

[0036] The impurity removal device 5 includes an impurity removal shell 501, a stretching plate 502, a handle 503, a sliding plate 504 and a second water filter hole 505. The lower end of the impurity removal shell 501 is fixedly connected to the upper surface of the bottom plate 1, the sliding plate 504 is fixedly connected to the side surface of the stretching plate 502, the handle 503 is fixedly connected to the rear surface of the stretching plate 502, the stretching plate 502 is slidably connected to the inner surface of the impurity removal shell 501 through the sliding plate 504, the second water filter hole 505 is opened on the lower surface of the stretching plate 502, and filter cotton is installed on the inner side of the stretching plate 502. A third water pump is fixedly connected to the impurity removal shell 501 near the lower end and located at the position of the second pipe 8, and the installed filter cotton can be replaced.

[0037] The crystallization device 6 includes a second shell 601, a temperature-controlled water tank 602, a second stirring rod 603, a second stirring blade 604, a propulsion blade 605, a fixed plate 606 and a crystallization tank 607, wherein the fixed plate 606 is fixedly connected to the upper surface of the limit long plate 307, the conical plate 608 is fixedly connected to the inner surface of the fixed plate 606, the crystallization tank 607 is fixedly connected to the upper surface of the conical plate 608, the second shell 601 is fixedly connected to the upper surface of the crystallization tank 607, the temperature-controlled water tank 602 is fixedly connected to the annular surface of the crystallization tank 607, and the inner surface of the second shell 601 is fixedly connected to the first Three motors, the second stirring rod 603 passes through the crystallization tank 607 and is fixedly connected to the output end of the third motor, the propulsion blade 605 is fixedly connected to the side surface of the second stirring rod 603, the propulsion blade 605 contacts the inner side of the conical plate 608, the second stirring blade 604 is fixedly connected to the side surface of the second stirring rod 603 located at the upper end of the propulsion blade 605, a sprayer is provided on the inner side of the fixed plate 606 near the conical plate 608, the right end of the sprayer is fixedly connected to the water inlet 9, the upper and lower ends of the temperature control water tank 602 are respectively provided with water pipes, and the lower end of the conical plate 608 is provided with an electric valve.

[0038] The temperature-controlled water tank 602 is externally connected to a temperature control device. The temperature control device transports water whose temperature has been adjusted to an appropriate temperature from a water pipe at the lower end of the temperature-controlled water tank 602 to the temperature-controlled water tank 602. After the temperature-controlled water tank 602 is filled, the water flows out from the water pipe at the upper end to the temperature control device and circulates continuously to control the temperature in the crystallization tank 607.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A purification device and a purification method for producing thiourea, comprising a bottom plate (1), characterized in that: A dissolving device (4) is fixedly connected to the upper surface of the bottom plate (1); a de-impurity device (5) is fixedly connected to the upper surface of the bottom plate (1) near the right end; a first pipeline (7) is fixedly connected between the dissolving device (4) and the de-impurity device (5); the first pipeline (7) is connected to the dissolving device (4) and the de-impurity device (5); a cleaning device (3) is arranged on the upper surface of the bottom plate (1) near the front side; a crystallization device (6) is arranged on the upper surface of the cleaning device (3); a placement groove (2) is arranged on the upper surface of the bottom plate (1) near the cleaning device (3); a second pipeline (8) is fixedly connected between the crystallization device (6) and the de-impurity device (5); the second pipeline (8) is connected to the crystallization device (6) and the de-impurity device (5).

2. A purification device and purification method for producing thiourea according to claim 1, characterized in that: The cleaning device (3) comprises a fixed block (301), an eccentric wheel (302), a connecting rod (303), a connecting block (304), a movable plate (305), a sliding block (306), a limiting long plate (307), a first water filtering hole (308), a sliding outlet (309) and a water tank (310); the fixed block (301) is fixedly connected to the upper surface of the bottom plate (1); the inner surface of the fixed block (301) is fixedly connected to a first motor; the eccentric wheel (302) is fixedly connected to the output end of the first motor; the lower surface of the connecting rod (303) is fixedly connected to a first movable pin; the connecting rod (303) is movably connected to the upper surface of the eccentric wheel (302) near the edge through the first movable pin; the inner surface of the connecting block (304) is rotatably connected to a second movable pin; the left end of the connecting rod (303) is movably connected to the inner surface of the connecting block (304) through the second movable pin.

3. A purification device and purification method for producing thiourea according to claim 2, characterized in that: The left end of the connecting block (304) is fixedly connected to the right side surface of the movable plate (305), the sliding block (306) is fixedly connected to the front and rear sides of the movable plate (305), the first water filtering hole (308) is provided on the bottom surface of the movable plate (305), the sliding outlet (309) is provided on the upper surface at the left end edge of the movable plate (305), the movable plate (305) is slidably connected to the inner side surface of the limiting long plate (307) through the sliding block (306), the limiting long plate (307) is fixedly connected to the upper surface of the bottom plate (1) near the two sides of the placement groove (2), and the movable plate (305) is tiltedly arranged on the side surface of the limiting long plate (307).

4. A purification device and purification method for producing thiourea according to claim 1, characterized in that: The dissolving device (4) comprises a dissolving tank (401), a first shell (402), a first stirring rod (403), a first stirring blade (404), an upstream blade (405), a first water pump (406), a water inlet pipe (407) and a second water pump (408); the lower surface of the dissolving tank (401) is fixedly connected to the upper surface of the bottom plate (1); the first shell (402) is fixedly connected to the upper surface of the dissolving tank (401); a second motor is fixedly connected inside the first shell (402); and an electric heating device is provided on the inner surface of the bottom of the dissolving tank (401).

5. A purification device and purification method for producing thiourea according to claim 4, characterized in that: The upper end of the first stirring rod (403) passes through the dissolution tank (401) and is fixedly connected to the output end of the second motor; the first stirring blade (404) is fixedly connected to the side surface of the first stirring rod (403); the upstream blade (405) is fixedly connected to the side surface of the lower end of the first stirring rod (403); and the second water pump (408) is fixedly connected to the inner surface of the water inlet pipe (407).

6. A purification device and purification method for producing thiourea according to claim 4, characterized in that: The second water pump (408) is fixedly connected to the upper surface of the bottom plate (1), the upper end of the water inlet pipe (407) is fixedly connected to the inner surface of the dissolution tank (401), the first water pump (406) is fixedly connected to the right inner surface of the dissolution tank (401), the first pipeline (7) is fixedly connected to the inner surface of the first water pump (406), and the first pipeline (7) is connected to the dissolution tank (401).

7. A purification device and purification method for producing thiourea according to claim 1, characterized in that: The impurity removal device (5) comprises an impurity removal housing (501), a stretching plate (502), a handle (503), a sliding plate (504) and a second water filter hole (505); the lower end of the impurity removal housing (501) is fixedly connected to the upper surface of the bottom plate (1); the sliding plate (504) is fixedly connected to the side surface of the stretching plate (502); the handle (503) is fixedly connected to the rear side surface of the stretching plate (502); the stretching plate (502) is slidably connected to the inner side surface of the impurity removal housing (501) through the sliding plate (504); the second water filter hole (505) is provided on the lower side surface of the stretching plate (502); a filter cotton is installed on the inner side of the stretching plate (502); and a third water pump is fixedly connected to the impurity removal housing (501) near the lower end and located at the position of the second pipeline (8).

8. A purification device and purification method for producing thiourea according to claim 2, characterized in that: The crystallization device (6) comprises a second shell (601), a temperature-controlled water tank (602), a second stirring rod (603), a second stirring blade (604), a propulsion blade (605), a fixed plate (606) and a crystallization tank (607), wherein the fixed plate (606) is fixedly connected to the upper surface of the limiting long plate (307), the conical plate (608) is fixedly connected to the inner surface of the fixed plate (606), the crystallization tank (607) is fixedly connected to the upper surface of the conical plate (608), the second shell (601) is fixedly connected to the upper surface of the crystallization tank (607), the temperature-controlled water tank (602) is fixedly connected to the annular surface of the crystallization tank (607), the inner surface of the second shell (601) is fixedly connected to a third motor, and the second stirring rod (603) passes through the crystallization tank (607) and is fixedly connected to the output end of the third motor.

9. A purification device and purification method for producing thiourea according to claim 8, characterized in that: The propulsion blade (605) is fixedly connected to the side surface of the second stirring rod (603), and the propulsion blade (605) contacts the inner side of the conical plate (608). The second stirring blade (604) is fixedly connected to the side surface of the second stirring rod (603) located at the upper end of the propulsion blade (605). A sprayer is provided on the inner side of the fixed plate (606) near the conical plate (608), and the right end of the sprayer is fixedly connected to a water inlet (9). The upper and lower ends of the temperature control water tank (602) are respectively provided with water pipes, and the lower end of the conical plate (608) is provided with an electric valve.

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