Potassium chloride solution evaporative crystallization device

Abstract

The invention relates to the technical field of evaporative crystallization, in particular to a potassium chloride solution evaporative crystallization device. Comprising an equipment frame; a bottom plate is fixedly mounted on the equipment frame, and an evaporation mechanism is arranged on the bottom plate; according to the evaporation mechanism disclosed by the invention, the separation part is used for stirring in the evaporation process of the potassium chloride solution so as to improve the precipitation efficiency of crystals, and meanwhile, the precipitated crystals can be filtered to the drying part in time, so that the crystals are effectively prevented from being excessively increased in the evaporation barrel, the flowability of the solution is kept, and the stirring and heating uniformity is also ensured; the problem that the mixing efficiency is reduced due to increase of the crystals is avoided, and the crystals in the drying part are heated and pre-dried through the suction part by utilizing steam heat generated by evaporating the potassium chloride solution, so that the utilization rate of energy is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of evaporation crystallization, and particularly relates to an evaporation crystallization device for potassium chloride solution. Background Art

[0002] The evaporation crystallization of potassium chloride solution is an important chemical separation and purification technology, which is widely used to extract high-purity potassium chloride crystals from aqueous solutions containing potassium chloride. The extraction method is to put the potassium chloride solution into a heating cylinder for heating and evaporation, and stir it to continuously reduce the water content in the solution until the potassium chloride concentration in the solution exceeds its solubility limit at the current temperature. At this time, the excess potassium chloride will precipitate in the form of crystals. After the crystallization is completed, the crystals are taken out for subsequent drying and other operations.

[0003] However, there are the following problems in the current evaporation crystallization process of potassium chloride: 1. The existing crystallization method is to crystallize all the substances in the potassium chloride solution at one time and then take them out together for subsequent operations. However, during the evaporation crystallization process, the crystals gradually precipitate and grow larger, resulting in a smaller internal space in the heating cylinder, affecting the stirring, thus reducing the mixing efficiency, resulting in different concentrations in different parts of the solution, and further affecting the growth rate and morphology of the crystals. Moreover, the thermal conductivities between the solid crystals and the liquid are different, and the presence of larger crystals will form a heat insulation effect, hindering the effective transfer of heat to the interior of the solution, thereby reducing the overall heating efficiency. 2. The crystals are taken out and dried only after the potassium chloride solution is completely converted into crystals, which means that the steam heat generated by heating the solution during the entire evaporation process is not effectively utilized, resulting in low energy utilization rate in the overall processing process. Summary of the Invention

[0004] In view of the above problems, the embodiments of the present application provide an evaporation crystallization device for potassium chloride solution to solve the above-mentioned technical problems.

[0005] To achieve the above object, the embodiments of the present application provide the following technical solutions: The embodiments of the present application provide an evaporation crystallization device for potassium chloride solution, including an equipment rack; a bottom plate is fixedly installed on the equipment rack, and an evaporation mechanism is arranged on the bottom plate.

[0006] The evaporation mechanism includes an evaporation cylinder. The evaporation cylinder is fixedly installed on the bottom plate through a support seat. The evaporation cylinder has a semi-circular structure. An electric heating wire for heating the potassium chloride solution in the evaporation cylinder is arranged on the evaporation cylinder. A U-shaped plate is fixedly installed at the upper end of the evaporation cylinder. A protective cover is rotatably installed at the upper end of the U-shaped plate, and a liquid inlet pipe is communicated with the protective cover.

[0007] A separation part for stirring the potassium chloride solution and timely separating the precipitated crystals from the mother liquor is provided on the U-shaped plate. A drying part for pre-drying the separated crystals is provided on the bottom plate. A scraping part for scraping the crystals on the separation part to the drying part is also provided on the U-shaped plate.

[0008] A suction part for pre-drying the crystals by using the heat of the steam generated by heating the potassium chloride solution is provided on the bottom plate.

[0009] As a preferred solution, the separation part includes a shaft column. A shaft column coaxial with the evaporation cylinder is rotatably installed between the two horizontal sections of the U-shaped plate. A filter plate is slidably installed in the evaporation cylinder. The middle part of the filter plate is fixedly connected to the shaft column. A stepping motor with an output shaft fixedly connected to the shaft column is fixedly installed at the front end of the front horizontal section of the U-shaped plate.

[0010] As a preferred solution, the drying part includes a drying pipe. A drying pipe located on the right side of the evaporation cylinder is fixedly installed at the upper end of the bottom plate. A guide plate is installed between the drying pipe and the evaporation cylinder. A discharge hole coaxial with the drying pipe is opened on the bottom plate. A semi-circular plate is fixedly installed at the upper end of the drying pipe. The front and rear end faces of the semi-circular plate are respectively fixedly connected to the two horizontal sections of the U-shaped plate. A cover plate is jointly fixedly installed on the semi-circular plate and the upper end of the U-shaped plate. A stirring rod is rotatably installed in the drying pipe. The upper end of the stirring rod rotatably penetrates the cover plate. A linkage is provided between the stirring rod and the shaft column. An opening and closing part for opening and closing the lower port of the drying pipe is provided on the bottom plate.

[0011] As a preferred solution, the scraping part includes inclined grooves. Inclined grooves that slope upward from bottom to right are opened on the two horizontal sections of the U-shaped plate and on the right side of the shaft column. Sliders are slidably installed in the inclined grooves. A scraper that abuts against the filter plate is jointly fixedly installed between the two sliders. A driving part for driving the slider to move is jointly provided on the shaft column and the bottom plate.

[0012] As a preferred solution, the driving part includes a limiting groove. A limiting groove is opened at the upper end of the bottom plate and behind the evaporation cylinder. A sliding seat is slidably installed in the limiting groove. A compression spring is fixedly installed between the right end of the sliding seat and the inner wall of the limiting groove. A vertical plate is fixedly installed at the upper end of the sliding seat. A waist-shaped groove is opened on the vertical plate. A roller that slidably penetrates the waist-shaped groove is fixedly installed at the rear end of the rear slider. A pushing component for pushing the vertical plate to move is provided on the shaft column.

[0013] As a preferred solution, the suction part includes a pipeline. A pipeline is communicated above the protective cover. A vertical cylinder is fixedly installed at the upper end of the bottom plate and in front of the evaporation cylinder. A filter box is communicated at the upper end of the vertical cylinder. A telescopic pipe is communicated between the filter box and the pipeline. A suction pump is fixedly installed at the upper end of the bottom plate. The intake end of the suction pump is communicated with the vertical cylinder through an intake pipe. A communication component is provided between the outlet end of the suction pump and the drying pipe.

[0014] As a preferred embodiment, the linkage member includes a rotating shaft, the upper end of the cover plate is rotatably mounted with the rotating shaft through a shaft plate, the rotating shaft and the stirring rod are connected via a bevel gear set, and the rotating shaft and the shaft column are connected via a pulley mechanism.

[0015] As a preferred embodiment, the opening and closing part includes a corner cylinder, which is fixedly installed on the upper end of the base plate and in front of the drying tube. The telescopic section of the corner cylinder slides through the base plate and is fixedly installed with a connecting plate, and a sealing disk is fixedly installed on the upper end of the connecting plate through a column.

[0016] As a preferred embodiment, the connecting component includes a spiral flow channel, the drying tube is provided with a spiral flow channel, both ends of the spiral flow channel pass through the drying tube, and the air outlet end of the suction pump is connected to one of the ports of the spiral flow channel through the air outlet pipe.

[0017] As a preferred solution, the pushing assembly includes a driving rod, the rear end of the shaft column is fixedly mounted with the driving rod, and rollers are rotatably mounted on the front sides of both ends of the driving rod.

[0018] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: 1. The evaporation mechanism of the present invention stirs the potassium chloride solution during the evaporation process through the separation part to improve the crystal precipitation efficiency, and at the same time, the precipitated crystals can be filtered to the drying part in time, effectively preventing the excessive growth of the crystals in the evaporation cylinder, which not only maintains the fluidity of the solution, but also ensures the uniformity of stirring and heating, and avoids the problem of reduced mixing efficiency due to crystal growth. The steam heat generated by evaporating the potassium chloride solution is used by the suction part to heat and pre-dry the crystals in the drying part to improve energy utilization.

[0019] 2. The separation section provided in the present invention can stir the potassium chloride solution by rotating the filter plate, so that the potassium chloride solution is evenly heated, thereby improving the crystal precipitation efficiency. After the crystals are precipitated, the filter plate can also filter the crystals out of the solution in time, and push the crystals to the drying section through the scraper to avoid affecting the mixing efficiency and heating efficiency due to the increase of the crystals.

[0020] 3. The suction part provided in the present invention filters the steam generated by heating the potassium chloride solution and passes it to the drying part to pre-dry the crystals, and improves the drying effect by rotating the stirring rod, thereby improving the efficiency of subsequent processing and the utilization rate of energy.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0024] Figure 2 It is a structural schematic diagram of the evaporation mechanism of the present invention.

[0025] Figure 3 It is a cross-sectional view of the present invention.

[0026] Figure 4 It is a schematic structural diagram of the separation unit of the present invention.

[0027] Figure 5 It is a schematic structural diagram of the driving member of the present invention.

[0028] Figure 6 It is a structural schematic diagram of the opening and closing member of the present invention.

[0029] Figure numerals: 10, equipment frame; 11, bottom plate; 2, evaporation mechanism; 20, evaporation cylinder; 21, shaped plate; 22, protective cover; 23, liquid inlet pipe; 24, drying section; 240, drying tube; 241, guide plate; 242, semicircular plate; 243, cover plate; 244, stirring rod; 3, linkage; 30, rotating shaft; 31, bevel gear set; 32, pulley mechanism; 4, opening and closing member; 40, corner cylinder; 41, connecting plate; 42, sealing disk; 25, separation section; 2 50. Shaft column; 251. Filter plate; 252. Stepper motor; 26. Scraper unit; 260. Inclined chute; 261. Sliding block; 262. Scraper; 5. Driving member; 50. Sliding seat; 51. Compression spring; 52. Vertical plate; 53. Roller; 54. Driving rod; 55. Roller; 27. Suction unit; 270. Pipeline; 271. Vertical cylinder; 272. Filter box; 273. Telescopic tube; 274. Suction pump; 275. Inlet pipe; 276. Spiral flow channel; 277. Outlet pipe. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0031] As Figure 1 shown, a potassium chloride solution evaporation crystallization device includes an equipment rack 10; a bottom plate 11 is fixedly installed on the equipment rack 10, and an evaporation mechanism 2 is arranged on the bottom plate 11.

[0032] As Figure 1 、 Figure 2 and Figure 3 shown, the evaporation mechanism 2 includes an evaporation cylinder 20. The evaporation cylinder 20 is fixedly installed on the bottom plate 11 through a support seat. The evaporation cylinder 20 has a semi-circular structure. An electric heating wire (not shown in the figure) for heating the potassium chloride solution in the evaporation cylinder 20 is arranged on the evaporation cylinder 20. A U-shaped plate 21 is fixedly installed at the upper end of the evaporation cylinder 20. A protective cover 22 is rotatably installed at the upper end of the U-shaped plate 21, and a liquid inlet pipe 23 is communicated with the protective cover 22.

[0033] As Figure 1 and Figure 2 shown, a separation part 25 for stirring the potassium chloride solution and timely separating the precipitated crystals from the mother liquor is arranged on the U-shaped plate 21. A drying part 24 for pre-drying the separated crystals is arranged on the bottom plate 11. A scraping part 26 for scraping the crystals on the separation part 25 to the drying part 24 is also arranged on the U-shaped plate 21.

[0034] As Figure 1 and Figure 2 shown, a suction part 27 for pre-drying the crystals by using the heat of the steam generated by heating the potassium chloride solution is arranged on the bottom plate 11.

[0035] During specific operation, a certain amount of potassium chloride solution is transported into the evaporation cylinder 20 through the liquid inlet pipe 23. Then, the separation part 25 stirs the solution in the evaporation cylinder 20. At the same time, the potassium chloride solution in the evaporation cylinder 20 is heated by the electric heating wire on the evaporation cylinder 20 to precipitate crystals. The separation part 25 moves the precipitated crystals into the drying part 24, and the suction part 27 uses the steam generated by heating the potassium chloride to pre-dry the potassium chloride crystals in the drying part 24.

[0036] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4 shown, the separation part 25 includes a shaft column 250. A shaft column 250 coaxial with the evaporation cylinder 20 is rotatably installed between the two transverse sections of the U-shaped plate 21. A filter plate 251 is slidably installed in the evaporation cylinder 20. The middle part of the filter plate 251 is fixedly connected to the shaft column 250. A stepping motor 252 with an output shaft fixedly connected to the shaft column 250 is fixedly installed at the front end of the front transverse section of the U-shaped plate 21.

[0037] As Figure 1 、 Figure 2 、 Figure 4 and Figure 5 shown, the scraping part 26 includes an inclined groove 260. The two transverse sections of the U-shaped plate 21 on the right side of the shaft column 250 are both provided with inclined grooves 260 that are inclined from bottom to upper right. Sliders 261 are slidably installed in the inclined grooves 260. A scraper 262 that abuts against the filter plate 251 is fixedly installed between the two sliders 261. A driving member 5 for driving the slider 261 to move is jointly provided on the shaft column 250 and the bottom plate 11.

[0038] As Figure 2 and Figure 5 shown, the driving member 5 includes a limiting groove. A limiting groove is opened at the upper end of the bottom plate 11 and behind the evaporation cylinder 20. A sliding seat 50 is slidably installed in the limiting groove. A compression spring 51 is fixedly installed between the right end of the sliding seat 50 and the inner wall of the limiting groove. A vertical plate 52 is fixedly installed at the upper end of the sliding seat 50. A waist-shaped groove is opened on the vertical plate 52. A roller 53 that slidably penetrates through the waist-shaped groove is fixedly installed at the rear end of the rear slider 261. A pushing component for pushing the vertical plate 52 to move is provided on the shaft column 250.

[0039] As Figure 5 shown, the pushing component includes a driving rod 54. A driving rod 54 is fixedly installed at the rear end of the shaft column 250. Roller shafts 55 are rotatably installed on the front sides of both ends of the driving rod 54.

[0040] During specific operation, the stepping motor 252 drives the filter plate 251 to rotate through the shaft column 250. The filter plate 251 stirs the heated potassium chloride solution in the evaporation cylinder 20, so that the potassium chloride solution in the evaporation cylinder 20 is heated evenly to accelerate the precipitation of crystals. As the potassium chloride solution in the evaporation cylinder 20 is heated and the potassium chloride concentration exceeds its solubility at this temperature, the solution enters a supersaturated state. At this stage, potassium chloride begins to precipitate from the solution and form tiny crystal nuclei, and these crystal nuclei will gradually grow larger to form visible crystals.

[0041] The precipitated crystals will be filtered by the filter plate 251 to separate from the mother liquor. At this time, the scraper 262 abuts against the lower end face of the filter plate 251, and at the same time, the roller shaft 55 abuts against the vertical plate 52. Then, as the shaft column 250 continues to rotate, the driving rod 54 will push the vertical plate 52 to move to the right through the roller shaft 55. The vertical plate 52 will drive the scraper 262 to move to the right along the inclined groove 260 through the roller 53 and the slider 261, so that the scraper 262 remains in contact with the filter plate 251 as the filter plate 251 rotates, and the crystals on the filter plate 251 are scraped into the drying part 24 for drying. When the distance between the scraper 262 and the shaft column 250 is greater than half of the length of the filter plate 251, as the shaft column 250 continues to rotate, the lower part of the filter plate 251 can rotate away from the scraper 262. Then, the shaft column 250 will drive the driving rod 54 and the roller shaft 55 away from the vertical plate 52. The vertical plate 52 will move leftward and reset under the action of the compression spring 51. The vertical plate 52 will also drive the scraper 262 to move leftward and reset through the roller 53 and the slider 261. Then, the upper part of the filter plate 251 will rotate into the solution and filter out crystals again, and then repeat the above operation to scrape the filtered crystals into the drying part 24. Repeat this operation until all the crystals in the potassium chloride solution are precipitated and pushed into the drying part 24 for pre-drying.

[0042] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, the drying part 24 includes a drying tube 240. The upper end of the bottom plate 11 is fixedly installed with a drying tube 240 located on the right side of the evaporation cylinder 20. A guide plate 241 is installed between the drying tube 240 and the evaporation cylinder 20. The bottom plate 11 is provided with a discharge hole coaxial with the drying tube 240. The upper end of the drying tube 240 is fixedly installed with a semi-circular plate 242. The front and rear end faces of the semi-circular plate 242 are respectively fixedly connected to the two transverse sections of the U-shaped plate 21. A cover plate 243 is fixedly installed together on the upper ends of the semi-circular plate 242 and the U-shaped plate 21. A stirring rod 244 is rotatably installed in the drying tube 240. The upper end of the stirring rod 244 rotatably penetrates through the cover plate 243. A linkage member 3 is provided between the stirring rod 244 and the shaft column 250. The bottom plate 11 is provided with an opening and closing member 4 for opening and closing the lower port of the drying tube 240.

[0043] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, the linkage member 3 includes a rotating shaft 30. The upper end of the cover plate 243 is rotatably installed with a rotating shaft 30 through a shaft plate. The rotating shaft 30 and the stirring rod 244 are传动连接通过锥齿轮组31传动连接. The rotating shaft 30 and the shaft column 250 are传动连接通过皮带轮机构32传动连接.

[0044] As Figure 4 and Figure 6 It should be noted that there are some inaccuracies in the original Chinese text in the description of the transmission connection in item . The correct expressions in English are "driven by a bevel gear set 31" and "driven by a pulley mechanism 32" respectively. The above translation has been corrected accordingly.As shown, the opening and closing member 4 includes a corner cylinder 40, and the corner cylinder 40 is fixedly installed at the upper end of the base plate 11 and in front of the drying tube 240. The telescopic section of the corner cylinder 40 slides through the base plate 11 and is fixedly installed with a connecting plate 41, and the upper end of the connecting plate 41 is fixedly installed with a sealing disk 42 through a column.

[0045] During specific operation, the shaft column 250 will drive the rotating shaft 30 to rotate through the pulley mechanism 32 during rotation, and the rotating shaft 30 will drive the stirring rod 244 to rotate through the bevel gear set 31. At the same time, the suction part 27 will pump the steam generated by the heated potassium chloride solution into the drying tube 240 to pre-dry the crystals in the drying tube 240. After the pre-drying is completed, the corner cylinder 40 drives the sealing disk 42 to move downward through the connecting plate 41 and the column to first move away from the drying tube 240 and the bottom plate 11, and then rotate ninety degrees away from the discharge hole. At this time, the lower port of the drying tube 240 is opened, and then with the rotation of the stirring rod 244, the pre-dried crystals can be quickly discharged through the discharge hole for centralized collection and treatment. After the crystals are discharged, the corner cylinder 40 first drives the sealing disk 42 to rotate ninety degrees through the connecting plate 41 and the column to make the drying tube 240 coaxial, and then drives the sealing disk 42 to move into the drying tube 240 to achieve the resetting of the sealing disk 42 and close the lower port of the drying tube 240 again.

[0046] like Figure 1 , Figure 3 and Figure 4 As shown, the suction part 27 includes a pipe 270, and the pipe 270 is connected just above the protective cover 22. A vertical tube 271 is fixedly installed at the upper end of the base plate 11 and in front of the evaporating tube 20. The upper end of the vertical tube 271 is connected to a filter box 272, and a telescopic tube 273 is connected between the filter box 272 and the pipe 270. A suction pump 274 is fixedly installed on the upper end of the base plate 11, and the air inlet end of the suction pump 274 is connected to the vertical tube 271 through an air inlet pipe 275, and a connecting component is arranged between the air outlet end of the suction pump 274 and the drying tube 240.

[0047] like Figure 1 , Figure 2 and Figure 6 As shown, the connecting component includes a spiral flow channel 276. The drying tube 240 is provided with a spiral flow channel 276. Both ends of the spiral flow channel 276 pass through the drying tube 240. The air outlet end of the suction pump 274 is connected to one of the ports of the spiral flow channel 276 through the air outlet pipe 277.

[0048] During specific operation, the suction pump 274 operates to draw the steam generated by the evaporating solution in the evaporating tube 20 into the telescopic tube 273 through the pipeline 270, and then enters the vertical tube 271 through the filter box 272. The filter box 272 is equipped with activated carbon and a filter screen to remove moisture and particulate matter in the steam. Finally, the steam is transported to the spiral flow channel 276 through the air inlet pipe 275, the suction pump 274 and the air outlet pipe 277. The gas in the spiral flow channel 276 transfers heat to the crystals in the drying tube 240 to pre-dry the crystals, thereby improving the efficiency of subsequent operations.

[0049] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0050] In addition, the terms "first", "second", "number one", "number two" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "number one", "number two" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A potassium chloride solution evaporation crystallization device, comprising an equipment frame (10); characterized in that: A bottom plate (11) is fixedly installed on the described equipment rack (10), and an evaporation mechanism (2) is arranged on the bottom plate (11); among which: The described evaporation mechanism (2) includes an evaporation cylinder (20). The evaporation cylinder (20) is fixedly installed on the bottom plate (11) through a support seat. The evaporation cylinder (20) is of a semi-circular structure. An electric heating wire for heating the potassium chloride solution in the evaporation cylinder (20) is arranged on the evaporation cylinder (20). A U-shaped plate (21) is fixedly installed at the upper end of the evaporation cylinder (20). A protective cover (22) is rotatably installed at the upper end of the U-shaped plate (21). A liquid inlet pipe (23) is communicated with the protective cover (22). A separation part (25) for stirring the potassium chloride solution and timely separating the precipitated crystals from the mother liquor is arranged on the U-shaped plate (21). A drying part (24) for pre-drying the separated crystals is arranged on the bottom plate (11). A scraping part (26) for scraping the crystals on the separation part (25) to the drying part (24) is also arranged on the U-shaped plate (21). A suction part (27) for pre-drying the crystals by using the heat of the steam generated by heating the potassium chloride solution is arranged on the bottom plate (11).

2. A potassium chloride solution evaporation crystallization device according to claim 1, characterized in that: The described separation part (25) includes a shaft column (250). A shaft column (250) coaxial with the evaporation cylinder (20) is rotatably installed between the two transverse sections of the U-shaped plate (21). A filter plate (251) is slidably installed in the evaporation cylinder (20). The middle part of the filter plate (251) is fixedly connected with the shaft column (250). A stepping motor (252) with an output shaft fixedly connected with the shaft column (250) is fixedly installed at the front end of the front transverse section of the U-shaped plate (21).

3. A potassium chloride solution evaporation crystallization device according to claim 2, characterized in that: The described drying part (24) includes a drying pipe (240). The drying pipe (240) is fixedly installed at the upper end of the bottom plate (11) on the right side of the evaporation cylinder (20). A guide plate (241) is installed between the drying pipe (240) and the evaporation cylinder (20). A discharge hole coaxial with the drying pipe (240) is opened on the bottom plate (11). A semi-circular plate (242) is fixedly installed at the upper end of the drying pipe (240). The front and rear end faces of the semi-circular plate (242) are respectively fixedly connected with the two transverse sections of the U-shaped plate (21). A cover plate (243) is jointly fixedly installed on the semi-circular plate (242) and the upper end of the U-shaped plate (21). A stirring rod (244) is rotatably installed in the drying pipe (240). The upper end of the stirring rod (244) rotatably penetrates through the cover plate (243). A linkage part (3) is arranged between the stirring rod (244) and the shaft column (250). An opening and closing part (4) for opening and closing the lower port of the drying pipe (240) is arranged on the bottom plate (11).

4. A potassium chloride solution evaporation crystallization device according to claim 2, characterized in that: The described scraping part (26) includes an inclined chute (260). The two transverse sections of the U-shaped plate (21) on the right side of the shaft column (250) are both provided with inclined chutes (260) that slope from bottom to upper right. Sliders (261) are slidably installed in the inclined chutes (260). A scraper (262) that抵触 the filter plate (251) is fixedly installed between the two sliders (261). A driving member (5) for driving the sliders (261) to move is jointly provided on the shaft column (250) and the bottom plate (11).

5. A potassium chloride solution evaporation crystallization device according to claim 4, characterized in that: The described driving member (5) includes a limiting groove. A limiting groove is opened at the upper end of the bottom plate (11) and behind the evaporation cylinder (20). A sliding seat (50) is slidably installed in the limiting groove. A compression spring (51) is fixedly installed between the right end of the sliding seat (50) and the inner wall of the limiting groove. A vertical plate (52) is fixedly installed at the upper end of the sliding seat (50). A waist-shaped groove is opened on the vertical plate (52). A roller (53) that slidably penetrates the waist-shaped groove is fixedly installed at the rear end of the rear slider (261). A pushing component for pushing the vertical plate (52) to move is provided on the shaft column (250).

6. A potassium chloride solution evaporation crystallization device according to claim 3, characterized in that: The described suction part (27) includes a pipeline (270). A pipeline (270) is communicated above the protective cover (22). A vertical cylinder (271) is fixedly installed at the upper end of the bottom plate (11) and in front of the evaporation cylinder (20). A filter box (272) is communicated at the upper end of the vertical cylinder (271). A telescopic pipe (273) is communicated between the filter box (272) and the pipeline (270). A suction pump (274) is fixedly installed at the upper end of the bottom plate (11). The intake end of the suction pump (274) is communicated with the vertical cylinder (271) through an intake pipe (275). A communicating component is provided between the outlet end of the suction pump (274) and the drying pipe (240).

7. A potassium chloride solution evaporation crystallization device according to claim 3, characterized in that: The described linkage member (3) includes a rotating shaft (30). The upper end of the cover plate (243) is rotatably installed with a rotating shaft (30) through a shaft plate. The rotating shaft (30) and the stirring rod (244) are传动连接 through a bevel gear set (31). The rotating shaft (30) and the shaft column (250) are传动连接 through a pulley mechanism (32).

8. A potassium chloride solution evaporation crystallization device according to claim 3, characterized in that: The described opening and closing member (4) includes a corner cylinder (40). A corner cylinder (40) is fixedly installed at the upper end of the bottom plate (11) and in front of the drying pipe (240). The telescopic section of the corner cylinder (40) slidably penetrates the bottom plate (11) and then a connecting plate (41) is fixedly installed. A sealing disk (42) is fixedly installed at the upper end of the connecting plate (41) through a column.

9. A potassium chloride solution evaporation crystallization device according to claim 6, characterized in that: The described communicating component includes a spiral flow channel (276). A spiral flow channel (276) is opened on the drying pipe (240). Both ends of the spiral flow channel (276) penetrate the drying pipe (240). The outlet end of the suction pump (274) is communicated with one of the ports of the spiral flow channel (276) through an outlet pipe (277).

10. A potassium chloride solution evaporation crystallization device according to claim 5, characterized in that: The described pushing component includes a driving rod (54). A driving rod (54) is fixedly installed at the rear end of the shaft column (250). Roller shafts (55) are rotatably installed on the front sides of both ends of the driving rod (54).

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