Melt crystallization tower and crystallization method

Abstract

The invention belongs to the technical field of melt crystallization, particularly relates to a melt crystallization tower and a crystallization method, and provides the following scheme aiming at the problem that the outer wall of a compact crystallization pipe of a crystallization tower in the prior art is inconvenient to clean in time: the melt crystallization tower comprises a tower pipe body which is integrally of a vertical tubular structure; a bottom frame is fixed to the outer wall of the bottom end of the tower pipe body, a bottom supporting ring is fixed to the position, close to the bottom end, of the circumferential inner wall of the tower pipe body, an upwards-bent heating pipe is inserted into the middle of the bottom supporting ring, and a potato-chip-shaped partition plate with an upward concave face is fixed to the position, close to the middle, of the circumferential inner wall of the tower pipe body. A filter screen plate is embedded in the middle of the groove bottom of the potato chip-shaped partition plate; and a horizontal sealing baffle plate is fixed above the position, close to the potato-chip-shaped partition plate, in the tower pipe body. The outer wall of the crystallization pipe can be brushed regularly during crystallization, so that the situation that the heat conduction efficiency becomes poor due to scaling of the pipe wall of the crystallization pipe can be prevented.

Description

Technical Field

[0001] The invention relates to the technical field of melt crystallization, and in particular to a melt crystallization tower and a crystallization method. Background Art

[0002] The melt crystallization tower is a device used to separate crystals from molten substances. It is widely used in the chemical, pharmaceutical, metallurgical and other industries to purify substances, separate different components or recover target products. It is a separation device that uses temperature gradient to guide the crystallization process. It is suitable for many industrial fields, especially the purification and separation of high-purity chemicals. Its core principle is to use the difference in solubility of substances at different temperatures to transform the solute from a molten state into a crystalline solid through temperature control.

[0003] After searching, it is found that the crystallization tower system in the prior art will produce a lot of scale and dirt on the outer wall of the crystallization tube after a period of use, which will affect the measurement and conduction of temperature. Most of the crystallization tubes in the prior art are made densely, which is particularly time-consuming and laborious to clean. Therefore, we propose a new crystallization tower and crystallization method that are easy to clean the surface of the crystallization tube. Summary of the invention

[0004] In view of the technical problem that the crystallization tower in the prior art is not convenient for timely cleaning the dense outer wall of the crystallization tube, the present invention adopts the following technical solution: A melting crystallization tower comprises a tower tube body with an overall vertical tubular structure, a bottom frame is fixed to the outer wall of the bottom end of the tower tube body, a bottom support ring is fixed to the circumferential inner wall of the tower tube body near the bottom end, and a heating tube bent upward is inserted in the middle of the bottom support ring, a potato chip-shaped partition with a concave surface facing upward is fixed to the circumferential inner wall of the tower tube body near the middle, and a filter screen is embedded in the middle of the groove bottom of the potato chip-shaped partition; a horizontal sealing baffle is fixed to the inside of the tower tube body near the potato chip-shaped partition, a plug hole is opened in the middle of the sealing baffle, and a vertical sealing through-tube is inserted in the plug hole; the circumferential inner wall of the tower tube body is fixed to the upper part of the potato chip-shaped partition, and a plug hole is opened in the middle of the sealing baffle, and a vertical sealing through-tube is inserted in the plug hole; A cap-shaped tube is fixed near the top, and an annular top cover is fixed to the circumferential outer wall of the cap-shaped tube near the top; the annular top cover, the tower tube body and the outer side of the annular top cover constitute a temporary storage chamber; the lower surface of the cap-shaped tube and the upper side of the sealing baffle form a crystallization chamber; a plurality of crystallization tubes with a centrally symmetrical distribution and a spiral structure are plugged into the surface of the cap-shaped tube; an anti-channeling bearing is fixed to the circumferential inner wall of the cap-shaped tube near the bottom, and a transmission tube extending into the crystallization chamber is rotatably connected to the anti-channeling bearing, and a plurality of spirally distributed cleaning rods are fixed to the circumferential outer wall of the transmission tube, and a brush head is fixed to the end of each cleaning rod away from the transmission tube.

[0005] Preferably, a liquid inlet pipe is inserted into the circumferential outer wall of the tower tube body near the top, and the same circulation pipe is inserted into the outer wall of the tower tube body near the upper and lower ends, the suction port end of the circulation pipe is inserted into the circumferential outer wall of the tower tube body near the bottom, and a circulation pump is provided near the bottom of the circulation pipe; the top water outlet end of the circulation pipe is inserted into a temporary storage cavity, so that when in use, the filtered liquid with small crystal particles can be recirculated and crystallized again until the crystal particles reach the required size.

[0006] Preferably, the bottom ends of the plurality of crystallization tubes are reserved with parallel and vertical straight tubes, and the bottom ends of the straight tubes at the bottom ends of the crystallization tubes are slidably sleeved with sealing sleeves, the circumferential outer wall of the sealing sleeve is reserved with a clamping ring, and there is an inherent compression spring between the upper surface of the clamping ring and the lower surface of the sealing baffle plate; the compression spring is sleeved on the corresponding outer wall of the straight tube; the circumferential inner wall of the cap-shaped tube is fixed with a fixed socket near the top, and an electric push rod is fixed on the surface of the fixed socket, and a pressure block is fixed on the top of the extension rod of the electric push rod, the circumferential inner wall of the sealing through-tube is slidably inserted with a hanging rod, and the top end of the hanging rod is fixed to the lower surface of the pressure block, and the bottom end of the hanging rod passes through the sealing through-tube and is fixed with a support plate; the circumferential outer wall of the support plate is reserved with an ear plate for sealing the pipe opening at the bottom end of the sealing sleeve.

[0007] Preferably, a rubber plug is fixed on the upper surface of the ear plate, and the top of the rubber plug is matched with the inner diameter of the straight tube, and a plurality of rib plates are fixed on the circumferential outer wall of the heating tube; thus, the sealing effect can be improved.

[0008] Preferably, a driven gear ring is sleeved on the outer circumferential wall of the top end of the transmission tube, and a motor seat is fixed to the inner wall of the cap-shaped tube near the bottom end, a reduction motor is fixed on the surface of the motor seat, and a driving gear meshing with the driven gear ring is fixed on the top end of the output shaft of the reduction motor; the surface of the crystal tube can be cleaned by controlling the start of the reduction motor.

[0009] Preferably, the bottom end of the cap-shaped tube is provided with a plurality of through holes, and the top end of the crystallization tube is inserted into the corresponding through holes; the plane where the top end opening of the crystallization tube is located is higher than the top end opening height of the through hole; it can play a certain filtering role when leaking liquid and can block some solidified block objects.

[0010] Preferably, the outer wall of the tower tube body is located at the upper and lower ends of the crystallization chamber, and cooling water pipes for water inlet and outlet are respectively connected, and the outer wall of the tower tube body is provided with an observation window on the front side, and the observation window is embedded with transparent glass, so that the state of the outer wall of the internal crystallization tube can be observed in real time to determine whether its surface needs to be cleaned.

[0011] Preferably, a circular hole with a hole center line passing through the axial line of the tower tube body is opened on the tube wall of the tower tube body above the potato chip-shaped partition, and a grain removal mechanism is arranged in the circular hole, and the grain removal mechanism comprises a straight tube embedded in the circular hole, an eccentric bell tube with a large opening facing the straight tube is fixed at one end of the straight tube away from the tower tube body, and a plug ring is embedded at the opening of the eccentric bell tube, and a hinged cover is hingedly connected to the surface of the plug ring; a sealing bearing is embedded on the thick tube wall of the eccentric bell tube, and a through-core spiral rod is rotatably connected in the sealing bearing , and two limit snap rings are fixed to the smooth rod part of the spiral rod near the sealed bearing, and the same spring retaining ring is rotatably connected between the two limit snap rings; a tightening spring is fixed to the side of the spring retaining ring, and the other end of the tightening spring is fixed to the surface of the hinged cover; an anti-twist sleeve is sleeved on the end of the spiral rod away from the potato chip-shaped partition, and a driving motor is fixed to the end of the anti-twist sleeve through a coupling; a permanent magnet is fixed to the end of the spiral rod away from the driving motor, and an electromagnet is embedded in the end of the outer wall of the tower tube body close to the permanent magnet.

[0012] Preferably, one end of the eccentric trumpet tube away from the straight-through tube is connected to a material receiving pipe, and the material receiving pipe is connected to an evaporator, so that the finished product after crystallization can be purified again.

[0013] A melt crystallization method comprises the following steps: S1: Before use, fill the crystallization chamber with cooling water, and then pass the saturated liquid into the temporary storage chamber from the liquid inlet pipe. Before passing into the temporary storage chamber, ensure that the ear plate of the support plate blocks the bottom ends of multiple crystallization tubes. After the crystallization tubes are filled and stay for a period of time, that is, after the crystallization period is over, start the electric push rod; S2: Before starting the electric push rod to discharge the crystals, first ensure that the electromagnet is energized, that is, the spiral rod and the hinged cover are tightly pressed against the end close to the plug ring; at this time, the crystals with large diameters are intercepted by the filter screen at the bottom of the potato chip-shaped partition groove, and the remaining liquid and small crystals fall onto the top of the bottom support ring below, and wait for the cycle crystallization after heating; S3: When a large number of large-diameter grains accumulate on the potato chip-shaped partition, the electromagnet can be turned off, and the drive motor can be controlled to start, so as to scrape the grains that meet the demand into the receiving pipe.

[0014] The beneficial effects of the present invention are: 1. By setting a transmission tube rotating in the crystallization chamber and cooperating with a brush head with a spiral distribution on its outer wall, the outer wall of the crystallization tube can be brushed regularly during crystallization, thereby preventing the heat conduction efficiency from being deteriorated due to scaling of the tube wall of the crystallization tube.

[0015] 2. By setting the hanging rod and the support plate with ear plates, the bottom water outlets of the three crystallization tubes can be blocked during crystallization, so that the liquid inside them stops flowing temporarily, which is conducive to full crystallization. After a period of crystallization, when more large grains are formed, water can be discharged again to quickly flush out the grains.

[0016] 3. By setting the permanent magnet and electromagnet, when the electromagnet is fed with current in different directions, it can form an attractive or repulsive force with the end of the permanent magnet, thereby blocking and opening the hinged cover, and the rotating spiral rod can be used to scrape off the large-diameter grains left after filtration. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a melt crystallization tower proposed by the present invention; Figure 2 A schematic diagram of a melt crystallization tower and a rear structure of a crystallization device proposed by the present invention; Figure 3 A top view of a melt crystallization tower proposed by the present invention; Figure 4 A melting crystallization tower proposed by the present invention Figure 3 Schematic diagram of the cross-sectional structure along line AA; Figure 5 A melting crystallization tower proposed by the present invention Figure 4 A schematic diagram of the enlarged structure at B in the middle; Figure 6 This is a schematic structural diagram of a grain removal mechanism in a melt crystallization tower proposed by the present invention; Figure 7 A schematic diagram of the assembly structure of a crystallization tube in a melt crystallization tower proposed by the present invention; Figure 8 This is a schematic diagram of the structure of a heating tube in a melting crystallization tower proposed by the present invention.

[0018] In the figure: 1, tower tube body; 101, potato chip-shaped partition; 102, sealing baffle; 2, liquid inlet pipe; 3, cap-shaped pipe; 4, annular top cover; 5, circulation pipe; 6, brush head; 7, observation window; 8, electromagnet; 9, circulation pump; 10, bottom frame; 11, material receiving pipe; 12, grain removal mechanism; 121, straight-through pipe; 122, eccentric trumpet pipe; 123, plug ring; 124, hinged cover; 125, screw rod; 126, limit Snap ring; 127, spring retaining ring; 128, anti-twist sleeve; 129, permanent magnet; 13, heating tube; 131, rib plate; 132, bottom support ring; 14, cooling water pipe; 15, pressure block; 16, reduction motor; 17, driven gear ring; 18, crystal tube; 19, sealing tube; 20, support plate; 21, transmission tube; 22, cleaning rod; 23, fixed base; 24, suspension rod; 25, compression spring; 26, sealing sleeve. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Reference Figure 1-8A melting crystallization tower comprises a tower tube body 1 of an overall vertical tubular structure, a bottom frame 10 is fixed to the outer wall of the bottom end of the tower tube body 1, a bottom support ring 132 is fixed to the inner wall of the circumference of the tower tube body 1 near the bottom end, and a heating tube 13 bent upward is inserted in the middle of the bottom support ring 132, and the top air outlet of the heating tube 13 passes through the side, and a burner is inserted into the inner wall of the heating tube 13 for heating, a potato chip-shaped partition 101 with a concave surface facing upward is fixed to the inner wall of the circumference of the tower tube body 1 near the middle, and a filter screen is embedded in the middle of the groove bottom of the potato chip-shaped partition 101; a horizontal sealing baffle 102 is fixed to the inside of the tower tube body 1 near the top of the potato chip-shaped partition 101, and a plug hole is opened in the middle of the sealing baffle 102, and a vertical sealing through-tube 19 is inserted in the plug hole; a cap-shaped tube 3 is fixed to the inner wall of the circumference of the tower tube body 1 near the top, and the outer circumference of the cap-shaped tube 3 An annular top cover 4 is fixed to the wall near the top; the annular top cover 4, the tower tube body 1 and the outer side of the annular top cover 4 constitute a temporary storage chamber; the lower surface of the cap-shaped tube 3 and the upper side of the sealing baffle 102 form a crystallization chamber; a plurality of crystallization tubes 18 with a centrally symmetrical distribution and a spiral structure are inserted on the surface of the cap-shaped tube 3; an anti-channeling bearing is fixed to the circumferential inner wall of the cap-shaped tube 3 near the bottom end, and a transmission tube 21 extending into the crystallization chamber is rotatably connected in the anti-channeling bearing, and a plurality of spirally distributed cleaning rods 22 are fixed to the circumferential outer wall of the transmission tube 21, and a brush head 6 is fixed to the end of each cleaning rod 22 away from the transmission tube 21; by setting the transmission tube 21 rotating in the crystallization chamber in conjunction with the brush head 6 with a spirally distributed outer wall thereof, the outer wall of the crystallization tube 18 can be brushed regularly during crystallization, thereby preventing the heat conduction efficiency from being deteriorated due to scaling of the tube wall of the crystallization tube 18.

[0021] Reference Figure 4 A liquid inlet pipe 2 is inserted into the circumferential outer wall of the tower tube body 1 near the top, and the same circulation pipe 5 is inserted into the outer wall of the tower tube body 1 near the upper and lower ends. The suction port end of the circulation pipe 5 is inserted into the circumferential outer wall of the tower tube body 1 near the bottom, and a circulation pump 9 is arranged near the bottom of the circulation pipe 5; the top water outlet end of the circulation pipe 5 is inserted into the temporary storage cavity, so that when in use, the filtered liquid with small crystal particles can be recirculated and crystallized again until the crystal particles reach the required size.

[0022] Reference Figure 4 and Figure 7, the bottom ends of the plurality of crystal tubes 18 are reserved with mutually parallel and vertical straight tubes, and the bottom ends of the straight tubes at the bottom ends of the crystal tubes 18 are all slidably sleeved with sealing sleeves 26, and the circumferential outer wall of the sealing sleeve 26 is reserved with a clamping ring, and there is an inherent compression spring 25 between the upper surface of the clamping ring and the lower surface of the sealing baffle 102; the compression spring 25 is sleeved on the corresponding outer wall of the straight tube; the circumferential inner wall of the cap-shaped tube 3 is fixed with a fixed card seat 23 near the top, and the surface of the fixed card seat 23 is fixed with an electric push rod, and the top end of the electric push rod extension rod is fixed with a pressure block 15, and the circumferential inner wall of the sealing through tube 19 is sealed. A hanging rod 24 is inserted into the wall for sliding, and the top of the hanging rod 24 is fixed on the lower surface of the pressing block 15, and the bottom end of the hanging rod 24 passes through the sealing through-tube 19 to be fixed with a supporting plate 20; the circumferential outer wall of the supporting plate 20 is reserved with an ear plate for sealing the bottom end pipe opening of the sealing sleeve 26; by setting the hanging rod 24 and the supporting plate 20 with ear plates, the bottom end water outlets of the three crystallization tubes 18 can be blocked during crystallization, so that the liquid inside them stops flowing temporarily, which is conducive to sufficient crystallization. After a period of crystallization, when more large grains are formed, water can be discharged again to quickly flush out the grains.

[0023] Reference Figure 7 The upper surface of the ear plate is fixed with a rubber plug, and the top of the rubber plug is adapted to the inner diameter of the straight tube. The circumferential outer wall of the heating tube 13 is fixed with a plurality of rib plates 131, which can improve the sealing effect.

[0024] Reference Figure 3-Figure 4 A driven gear ring 17 is sleeved on the outer wall of the top circumference of the transmission tube 21, and a motor seat is fixed to the inner wall of the cap-shaped tube 3 near the bottom end, a reduction motor 16 is fixed on the surface of the motor seat, and a driving gear meshing with the driven gear ring 17 is fixed on the top of the output shaft of the reduction motor 16; the surface of the crystal tube 18 can be cleaned by controlling the start of the reduction motor 16.

[0025] Reference Figure 4 The bottom end of the cap-shaped tube 3 is provided with a plurality of through holes, and the top end of the crystallization tube 18 is inserted into the corresponding through holes; the plane where the top opening of the crystallization tube 18 is located is higher than the top opening height of the through hole; it can play a certain filtering role when leaking liquid, and can block some solidified block objects.

[0026] Reference Figure 1-Figure 2 The outer wall of the tower tube body 1 is located at the upper and lower ends of the crystallization chamber, and cooling water pipes 14 for water inlet and outlet are respectively inserted therein. The outer wall of the tower tube body 1 is provided with an observation window 7 at the front. The observation window 7 is embedded with transparent glass, so that the state of the outer wall of the internal crystallization tube 18 can be observed in real time to determine whether its surface needs to be cleaned.

[0027] Reference Figure 4-Figure 6The tube wall of the tower tube body 1 is located above the potato chip-shaped partition 101 and is provided with a circular hole whose hole center line passes through the axis line of the tower tube body 1, and a grain removal mechanism 12 is arranged in the circular hole, and the grain removal mechanism 12 includes a straight tube 121 embedded in the circular hole, and an eccentric trumpet tube 122 with a large opening facing the straight tube 121 is fixed at one end of the straight tube 121 away from the tower tube body 1, and a plug ring 123 is embedded at the opening of the eccentric trumpet tube 122, and a hinged cover 124 is hinged on the surface of the plug ring 123; a sealing bearing is embedded on the thick tube wall of the eccentric trumpet tube 122, and a through-core spiral rod 125 is rotatably connected in the sealing bearing, and two limit snap rings 126 are fixed to the light rod part of the spiral rod 125 near the sealing bearing, and the two limit snap rings 126 are fixed between the two limit snap rings 126 The same spring retaining ring 127 is rotatably connected thereto; a locking spring is fixed to the side of the spring retaining ring 127, and the other end of the locking spring is fixed to the surface of the hinged cover 124; an anti-twist sleeve 128 is sleeved on the end of the spiral rod 125 away from the potato chip-shaped partition 101, and the end of the anti-twist sleeve 128 is fixed to the driving motor through a coupling; a permanent magnet 129 is fixed to the end of the spiral rod 125 away from the driving motor, and an electromagnet 8 is embedded at the end of the outer wall of the tower tube body 1 close to the permanent magnet 129. When current in different directions is passed through the electromagnet 8, an attractive or repulsive force can be formed with the end of the permanent magnet 129, thereby blocking and pulling open the hinged cover 124, and the large-diameter grains left after filtration can be scraped off by cooperating with the rotating spiral rod 125.

[0028] Reference Figure 6 One end of the eccentric trumpet tube 122 away from the straight tube 121 is connected to a material receiving tube 11, and the material receiving tube 11 is connected to an evaporator, so that the finished product after crystallization can be purified again.

[0029] A melt crystallization method, the method comprising the following steps: S1: Before use, the crystallization chamber is filled with cooling water, and then the saturated liquid is passed into the temporary storage chamber from the liquid inlet pipe 2. Before passing into the temporary storage chamber, ensure that the ear plate of the support plate 20 blocks the bottom ends of the plurality of crystallization tubes 18. After the crystallization tubes 18 are filled and stay for a period of time, that is, after the crystallization period ends, the electric push rod is started; S2: Before starting the electric push rod to discharge the crystals, first ensure that the electromagnet 8 is energized, that is, the spiral rod 125 and the hinged cover 124 are tightly pressed against the end close to the plug ring 123; at this time, the crystals with large diameters are intercepted by the filter screen at the bottom of the potato chip-shaped partition 101, and the remaining liquid and small crystals fall onto the bottom support ring 132 below, and wait for cyclic crystallization after heating; S3: When the large-diameter grains on the potato chip-shaped partition 101 accumulate to a large extent, the electromagnet 8 can be turned off, and the driving motor can be controlled to start, so as to scrape the grains that meet the demand into the receiving pipe 11.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A melt crystallization tower, comprising a tower tube body (1) of an overall vertical tubular structure, a bottom frame (10) being fixed to the outer wall of the bottom end of the tower tube body (1), a bottom support ring (132) being fixed to the inner wall of the circumference of the tower tube body (1) near the bottom end, and an upwardly bent heating tube (13) being inserted in the middle of the bottom support ring (132), characterized in that: A potato chip-shaped partition (101) with a concave surface facing upward is fixed near the middle of the circumferential inner wall of the tower tube body (1), and a filter screen is embedded in the middle of the groove bottom of the potato chip-shaped partition (101); a horizontal sealing baffle (102) is fixed inside the tower tube body (1) near the potato chip-shaped partition (101), and a plug hole is opened in the middle of the sealing baffle (102), and a vertical sealing through-tube (19) is inserted into the plug hole; a cap-shaped tube (3) is fixed near the top of the circumferential inner wall of the tower tube body (1), and an annular top is fixed near the top of the circumferential outer wall of the cap-shaped tube (3). The cover (4) comprises a cap-shaped tube (3); the lower surface of the cap-shaped tube (3) and the upper part of the sealing baffle plate (102) form a crystallization chamber; a plurality of crystallization tubes (18) with a centrally symmetrical distribution and a spiral structure are inserted into the surface of the cap-shaped tube (3); an anti-slip bearing is fixed to the circumferential inner wall of the cap-shaped tube (3) near the bottom end, and a transmission tube (21) extending into the crystallization chamber is rotatably connected to the anti-slip bearing; a plurality of cleaning rods (22) distributed in a spiral shape are fixed to the circumferential outer wall of the transmission tube (21), and a brush head (6) is fixed to the end of each cleaning rod (22) away from the transmission tube (21).

2. A melt crystallization tower according to claim 1, characterized in that: A liquid inlet pipe (2) is inserted into the circumferential outer wall of the tower tube body (1) near the top, and a same circulation pipe (5) is inserted into the outer wall of the tower tube body (1) near the upper and lower ends, the suction port end of the circulation pipe (5) is inserted into the circumferential outer wall of the tower tube body (1) near the bottom, and a circulation pump (9) is provided near the bottom of the circulation pipe (5); the top water outlet end of the circulation pipe (5) is inserted into the temporary storage cavity.

3. A melt crystallization tower according to claim 2, characterized in that, A straight tube is reserved at the bottom end of each of the plurality of crystallization tubes (18), and a sealing sleeve (26) is slidably sleeved at the bottom end of each of the straight tubes at the bottom end of the crystallization tube (18). A clamping ring is reserved at the circumferential outer wall of the sealing sleeve (26), and a compression spring (25) is inherently disposed between the upper surface of the clamping ring and the lower surface of the sealing baffle plate (102); the compression spring (25) is sleeved on the outer wall of the corresponding straight tube; a fixed clamping seat (26) is fixed near the top of the circumferential inner wall of the cap-shaped tube (3). 3), and an electric push rod is fixed on the surface of the fixed base (23), a pressure block (15) is fixed on the top of the extension rod of the electric push rod, a suspension rod (24) is slidably inserted into the circumferential inner wall of the sealing through-tube (19), and the top of the suspension rod (24) is fixed on the lower surface of the pressure block (15), and the bottom end of the suspension rod (24) passes through the sealing through-tube (19) and is fixed with a support plate (20); an ear plate is reserved on the circumferential outer wall of the support plate (20) for sealing the bottom end pipe opening of the sealing sleeve (26).

4. A melt crystallization tower according to claim 3, characterized in that: A rubber plug is fixed to the upper surface of the ear plate, and the top end of the rubber plug is matched to the inner diameter of the straight tube. A plurality of rib plates (131) are fixed to the circumferential outer wall of the heating tube (13).

5. A melt crystallization tower according to claim 4, characterized in that: A driven gear ring (17) is sleeved on the outer circumferential wall of the top end of the transmission tube (21), and a motor seat is fixed to the inner wall of the cap-shaped tube (3) near the bottom end, a reduction motor (16) is fixed to the surface of the motor seat, and a driving gear meshing with the driven gear ring (17) is fixed to the top end of the output shaft of the reduction motor (16).

6. A melt crystallization tower according to claim 5, characterized in that: The bottom end of the cap-shaped tube (3) is provided with a plurality of through holes, and the top end of the crystallization tube (18) is inserted into the corresponding through holes; the plane where the top end opening of the crystallization tube (18) is located is higher than the top end opening height of the through hole.

7. A melt crystallization tower according to claim 6, characterized in that: The outer wall of the tower tube body (1) is located at the upper and lower ends of the crystallization chamber, and cooling water pipes (14) for water inlet and outlet are respectively inserted therein, and the outer wall of the tower tube body (1) is provided with an observation window (7) at the front, and the observation window (7) is embedded with transparent glass.

8. A melt crystallization tower according to claim 7, characterized in that: The tube wall of the tower tube body (1) is located above the potato chip-shaped partition (101) and is provided with a circular hole whose center line passes through the axis line of the tower tube body (1), and a grain removal mechanism (12) is arranged in the circular hole, and the grain removal mechanism (12) comprises a straight tube (121) embedded in the circular hole, an eccentric bell tube (122) with a large opening facing the straight tube (121) is fixed at one end of the straight tube (121) away from the tower tube body (1), and a plug ring (123) is embedded at the opening of the eccentric bell tube (122), and a hinged cover (124) is hingedly connected to the surface of the plug ring (123); a sealing bearing is embedded in the thick tube wall of the eccentric bell tube (122), and a spiral rod (125) penetrating the center is rotatably connected in the sealing bearing, and Two limit snap rings (126) are fixed to the bare rod portion of the spiral rod (125) near the sealing bearing, and a spring retaining ring (127) is rotatably connected between the two limit snap rings (126); a clamping spring is fixed to the side of the spring retaining ring (127), and the other end of the clamping spring is fixed to the surface of the hinged cover (124); an anti-twist sleeve (128) is sleeved on one end of the spiral rod (125) away from the potato chip-shaped partition (101), and a driving motor is fixed to the end of the anti-twist sleeve (128) via a coupling; a permanent magnet (129) is fixed to one end of the spiral rod (125) away from the driving motor, and an electromagnet (8) is embedded in the end of the outer wall of the tower tube body (1) near the permanent magnet (129).

9. A melt crystallization tower according to claim 8, characterized in that: One end of the eccentric trumpet tube (122) away from the straight-through tube (121) is connected to a material receiving tube (11), and the material receiving tube (11) is connected to the evaporator.

10. A melt crystallization method, performed using a melt crystallization tower as claimed in any one of claims 1 to 9, characterized in that: The method comprises the following steps: S1: before use, the crystallization chamber is filled with cooling water, and then the saturated liquid is passed from the liquid inlet pipe (2) into the temporary storage chamber. Before passing the liquid into the temporary storage chamber, ensure that the ear plate of the support plate (20) blocks the bottom ends of the plurality of crystallization tubes (18). After the crystallization tubes (18) are filled and stay there for a period of time, that is, after the crystallization period ends, the electric push rod is started; S2: Before starting the electric push rod to discharge the crystal grains, first ensure that the electromagnet (8) is energized, that is, the spiral rod (125) and the hinged cover (124) are tightly pressed against one end close to the plug ring (123); at this time, the crystal grains with large diameters are intercepted by the filter screen at the bottom of the potato chip-shaped partition (101), and the remaining liquid and small crystal grains fall onto the bottom support ring (132) below, and wait for cyclic crystallization after heating; S3: When a large number of large-diameter crystal grains are accumulated on the potato chip-shaped partition plate (101), the electromagnet (8) can be turned off, and the driving motor can be controlled to start, so as to scrape the crystal grains that meet the demand into the receiving pipe (11).

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