An ultrafine ammonium paratungstate evaporation crystallization device and crystallization method

Abstract

The application discloses an ultrafine ammonium paratungstate evaporation crystallization device and a crystallization method. The device comprises a shell, an evaporation barrel is arranged at the middle of the top end of the shell, a feeding pipe and a collecting pipe are arranged at the top end of the evaporation barrel, the other end of the collecting pipe is connected with the shell, the collecting pipe is arranged in a U shape, a heater is arranged at the bottom of the evaporation barrel, and a collecting assembly is arranged in the shell through the collecting pipe. The device has the beneficial effects that the collecting assembly, the flow guiding assembly, the drainage assembly and the screening assembly are arranged, the steam and the ammonia gas generated during evaporation can be utilized again, the ammonia gas and the steam can be filtered at the same time, the high energy of the high pressure of the ammonia gas can drive the screening assembly to screen the ammonium paratungstate crystals, and therefore, the device for separating the ammonia gas and the water vapor is not needed during the crystallization of the ammonium paratungstate, and the working efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ammonium paratungstate processing, in particular to an ultrafine ammonium paratungstate evaporation crystallization device and crystallization method. BACKGROUND

[0002] Ammonium paratungstate is a chemical substance, mainly white crystals, there are two kinds of flaky or needle-like, used to make tungsten trioxide or blue tungsten oxide metal tungsten powder, also used as the manufacture of ammonium paratungstate and other tungsten compounds, used in the petroleum chemical industry as an additive. With the continuous development of high performance tungsten materials and tungsten alloy, the application prospect of high purity ammonium paratungstate (APT) will be more broad, therefore, the preparation process of high purity ammonium paratungstate (APT) has attracted people's attention.

[0003] When the ammonium paratungstate solution is evaporated, water vapor and ammonia will appear, and after the water vapor and ammonia are discharged, they need to be collected for secondary separation, and at the same time, the ammonium paratungstate needs to be sieved after evaporation, which also needs to be taken out for sieving after evaporation crystallization, which will result in a large amount of work intensity for processing water vapor, ammonia and ammonium paratungstate crystals, thereby consuming a certain amount of time.

[0004] In view of the problems in the related art, no effective solution has been proposed so far. SUMMARY

[0005] In view of the problems in the related art, the present application proposes an ultrafine ammonium paratungstate evaporation crystallization device and crystallization method. To overcome the above technical problems existing in the prior art.

[0006] The technical scheme of the present application is as follows: an ultrafine ammonium paratungstate evaporation crystallization device, comprising an outer shell, an evaporation barrel is installed in the middle of the top end of the outer shell, an inlet pipe and a collection pipe are installed at the top end of the evaporation barrel respectively, the other end of the collection pipe is connected with the outer shell, and the collection pipe is arranged in a U shape, a heater is installed at the bottom of the evaporation barrel, a collection assembly is installed in the outer shell through the collection pipe, a flow guide assembly is installed at the bottom of the outer shell, a discharge assembly is installed at the end of the outer shell away from the collection pipe, and a sieving assembly is connected with the evaporation barrel through the discharge assembly.

[0007] Further, the collection assembly comprises a partition plate, the partition plate is installed between the inner wall of the outer shell and the evaporation barrel, a one-way valve is installed on the partition plate, the collection pipe extends into the outer shell and is connected with the one-way valve, a steam pump is installed at the other end of the one-way valve, the steam pump is installed at the bottom end of the partition plate, and the output end of the steam pump faces downward.

[0008] Further, the flow guide assembly comprises a telescopic rod, which is installed in the shell below the baffle plate, and a return spring is sleeved outside the telescopic rod, wherein the top end of the telescopic rod is installed with an inclined plate, which is inclined to the evaporation barrel and the bottom end thereof is attached to the bottom of the evaporation barrel.

[0009] Further, the bottom end of the inclined plate is fixedly installed with a sliding plate, the bottom end of the shell is installed with a clamping plate below the sliding plate, wherein a cavity is formed between the clamping plate and the inner wall of the shell through a groove on the clamping plate, the sliding plate is inserted into the clamping plate and is in sliding connection with the groove in the clamping plate, the middle part of the bottom end of the shell is obliquely provided with a soda lime bag, the top end of the soda lime bag is connected to the bottom end of the evaporation barrel near the corner of the inclined plate, and the bottom end of the soda lime bag is connected to the middle part of the bottom end of the shell.

[0010] Further, the drainage assembly comprises a horizontal plate, a through hole is formed in the middle part of the horizontal plate, a check valve is installed at one end of the horizontal plate away from the soda lime bag, a sealing plate is connected to the horizontal plate through a piston outside the shell, and the through hole is blocked by the sealing plate, a drainage pipe is installed at the other end of the check valve, a ring cavity pipe is installed at the top end of the drainage pipe, a positioning ring is connected to the ring cavity pipe through a piston inside the ring cavity pipe, a drainage cavity pipe is connected to the top of the drainage pipe through a piston, a drainage port is formed in a part of the drainage cavity pipe outside the drainage pipe, and the positioning ring is connected to the outside of the drainage cavity pipe through a connecting rod.

[0011] Further, the screening assembly comprises a screening chute, which is symmetrically formed in the evaporation barrel, wherein the screening chute near the side of the drainage pipe is T-shaped, a screening plate is slidingly installed between the screening chutes, a screening slide plate is installed at one end of the screening plate near the T-shaped screening chute, a driving rod is symmetrically installed at one end of the screening slide plate near the drainage cavity pipe, the driving rod extends to the outside of the evaporation barrel and is installed with a triangular plate, the triangular plate is installed with a driving spring between the evaporation barrel, wherein the bottom end of the evaporation barrel is installed with soft rods equal in number to the screening holes of the screening plate through a supporting plate, the soft rods extend into the screening holes and are processed to form spherical surfaces, the top end of the soft rods is formed with a screening groove at the spherical surface, and a heat insulation layer is coated on the inner wall of the evaporation barrel.

[0012] According to another aspect of the present application, there is provided an ammonium paratungstate evaporation crystallization method for the above-mentioned ultra-fine ammonium paratungstate evaporation crystallization device.

[0013] The crystallization method of the multi-layer ultra-fine ammonium paratungstate evaporation crystallization device comprises the following steps:

[0014] S101, the ammonium paratungstate solution is transported into the evaporation barrel through the feeding pipe;

[0015] S102, at this time, the heater is started to heat the solution on the screening plate until boiling starts evaporation;

[0016] S103, the steam pump is started, the evaporated steam and ammonia gas are transported to the shell through the one-way valve and pressurized, as the gas pressure increases, the inclined plate will be pushed to move downward, then the steam and ammonia gas are transported to the bottom of the shell;

[0017] S104, the water vapor is absorbed by the lime bag, and the ammonia gas is filtered to the other side of the lime bag;

[0018] S105, after evaporation, cooling is carried out, and after cooling, the sealing plate is pulled out;

[0019] S106, as the internal ammonia gas continues to output, the gradual increase of the internal gas pressure will push the exhaust cavity pipe, which will drive the screening assembly to screen;

[0020] S107, pushing the exhaust cavity pipe will exhaust through the exhaust port, and then restore the original state, and the above steps are repeated by increasing the internal gas pressure.

[0021] S108, the connecting pipeline is connected at the exhaust port to recover the ammonia gas, and the connecting pipeline is connected at the steam filter to recover the water.

[0022] Based on S106, as the ammonia gas is output, the gas pressure in the exhaust pipe is greater than the gas pressure in the annular cavity pipe, so that the exhaust port is exhausted.

[0023] The present application provides a superfine ammonium paratungstate evaporation crystallization device and crystallization method, which has the following beneficial effects:

[0024] 1、The collecting assembly, flow guiding assembly, exhaust assembly and screening assembly are arranged, so that the steam and ammonia gas generated during evaporation can be reused, the ammonia gas and steam can be filtered at the same time, and the high-energy high-pressure ammonia gas can drive the screening assembly to screen the ammonium paratungstate crystals, thereby eliminating the need for a device to separate ammonia gas and water vapor during crystallization of ammonium paratungstate, and greatly improving the working efficiency.

[0025] The ammonium paratungstate solution is transported into the evaporation barrel through the feed pipe, the heater is started to heat, the ammonium paratungstate solution is boiled and evaporated, when steam appears, the steam pump is started, the steam and ammonia gas evaporated by the ammonium paratungstate are transported into the space between the partition plate and the inclined plate, the steam pump is pressurized, the inclined plate moves downward under the pressure of the steam and ammonia gas, at this time, the steam and ammonia gas are transported to the lime bag along with the downward movement of the inclined plate, the water in the water vapor is absorbed by the lime bag, and the ammonia gas is filtered out, so that the ammonia gas is transported to the other side of the lime bag for storage.

[0026] At this time, after the evaporation of ammonium paratungstate is finished, cooling is performed, the sealing plate in the horizontal plate is extracted after the cooling is finished, and the sealing plate is not completely extracted, that is, the through hole is communicated with the check valve. At this time, because the internal air pressure is relatively high, the high-pressure ammonia gas in the check valve is transported to the exhaust pipe. Then, the high-pressure ammonia gas in the exhaust pipe pushes the exhaust cavity pipe outward. When the air pressure in the exhaust pipe is greater than the air pressure in the annular cavity pipe, the exhaust cavity pipe is pushed outward. Then, the movement of the exhaust cavity pipe pushes the movement of the triangular plate, and the movement of the triangular plate pushes the sliding of the screening plate in the screening sliding groove. At this time, the ammonia gas in the exhaust cavity pipe is discharged through the exhaust port, the internal air pressure is reduced, and then the exhaust cavity pipe is reset. The screening plate is reset by the driving spring, so that the screening plate in the evaporation barrel is driven to screen reciprocatingly. In addition, the movement of the screening plate during screening pushes the soft rod, so that the soft rod is inclined, the screening groove on the soft rod is turned downward, the fine ammonium paratungstate crystals are taken away, and the impurities are left above, so that the screening is performed without affecting the storage solution.

[0027] After the work is finished, the plug on the shell can be pulled out by using the air pump or the water pump, so that the ammonia gas in the shell is extracted. The position of the exhaust pipe of the shell is communicated with the position during the work, the discharged ammonia gas is collected, and the filtered water is collected by the water pump for the next use. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0029] Figure 1 It is an external view of a superfine ammonium paratungstate evaporation crystallization device according to an embodiment of the present application.

[0030] Figure 2 It is a shell internal structure schematic view of a superfine ammonium paratungstate evaporation crystallization device according to an embodiment of the present application.

[0031] Figure 3 It is a shell internal structure schematic view of a superfine ammonium paratungstate evaporation crystallization device according to an embodiment of the present application.

[0032] Figure 4 It is an enlarged view of A of a superfine ammonium paratungstate evaporation crystallization device according to an embodiment of the present application.

[0033] Figure 5This is a cross-sectional view of an ultrafine ammonium paratungstate evaporation and crystallization apparatus according to an embodiment of the present invention;

[0034] Figure 6 This is a cross-sectional front view of an ultrafine ammonium paratungstate evaporation and crystallization apparatus according to an embodiment of the present invention;

[0035] Figure 7 This is an enlarged view of section B of an ultrafine ammonium paratungstate evaporation and crystallization apparatus according to an embodiment of the present invention.

[0036] In the picture:

[0037] 1. Outer shell; 2. Evaporation tank; 3. Feed pipe; 4. Collection pipe; 5. Heater; 6. Collection assembly; 7. Guide assembly; 8. Discharge assembly; 9. Screening assembly; 601. Baffle plate; 602. One-way valve; 603. Steam pump; 701. Telescopic rod; 702. Return spring; 703. Inclined plate; 704. Slide plate; 705. Clamping plate; 706. Cavity; 707. Soda lime bag; 801. Horizontal plate; 802. Through hole; 803. Check valve; 804. Sealing plate; 805. Discharge pipe; 806. Annular cavity tube; 807. Positioning ring; 808. Discharge cavity tube; 809. Discharge port; 901. Screen trough; 902. Screening plate; 903. Screen slide plate; 904. Drive rod; 905. Triangular plate; 906. Drive spring; 907. Soft rod; 908. Screen groove. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0039] like Figures 1-7 As shown, an ultrafine ammonium paratungstate evaporation and crystallization device according to an embodiment of the present invention includes a shell 1, an evaporation tank 2 installed at the top center of the shell 1, a feed pipe 3 and a collection pipe 4 respectively installed at the top of the evaporation tank 2, the other end of the collection pipe 4 being connected to the shell 1, and the collection pipe 4 being U-shaped, a heater 5 installed at the bottom of the evaporation tank 2, a collection assembly 6 installed inside the shell 1 through the collection pipe 4, a flow guiding assembly 7 installed at the bottom of the shell 1, a discharge assembly 8 installed at the end of the shell 1 away from the collection pipe 4, and a screening assembly 9 connected to the evaporation tank 2 through the discharge assembly 8.

[0040] Through the setting of the collecting assembly 6, the flow guide assembly 7, the excretion assembly 8 and the screening assembly 9, the steam and the ammonia gas generated during evaporation can be utilized again, the ammonia gas and the steam can be filtered at the same time, and the high energy of the high pressure of the ammonia gas can drive the screening assembly 9 to screen the ammonium paratungstate crystals, so that the device for separating the ammonia gas and the steam is omitted during the crystallization of the ammonium paratungstate, and the working efficiency is greatly improved.

[0041] In addition, as shown in the drawings, Figures 2-6 In one embodiment, the collecting assembly 6 includes a partition plate 601 installed between the inner wall of the shell 1 and the evaporation barrel 2, a one-way valve 602 installed on the partition plate 601, the collecting pipe 4 extending into the shell 1 and connected with the one-way valve 602, a steam pump 603 installed at the other end of the one-way valve 602, the steam pump 603 installed at the bottom end of the partition plate 601, the output end of the steam pump 603 downward, the flow guide assembly 7 including a telescopic rod 701 installed below the partition plate 601 in the shell 1, a reset spring 702 sleeved outside the telescopic rod 701, a top end of the telescopic rod 701 installed with an inclined plate 703, the inclined plate 703 inclined to the evaporation barrel 2, the bottom end of the inclined plate 703 downwardly inclined and fitted at the junction of the evaporation barrel 2, a slide plate 704 fixedly installed at the bottom of the inclined plate 703, a clamping plate 705 installed below the slide plate 704 in the shell 1, a cavity 706 formed by the recess on the clamping plate 705 and the inner wall of the shell 1, the slide plate 704 inserted into the clamping plate 705 and slidably connected with the recess in the clamping plate 705, an alkali lime bag 707 obliquely arranged at the middle part of the bottom end of the shell 1, the top of the alkali lime bag 707 connected with the junction of the evaporation barrel 2 and the corner of the inclined plate 703, and the bottom end of the alkali lime bag 707 connected with the middle part of the bottom end of the shell 1, the ammonium paratungstate solution transported into the evaporation barrel 2 through the feed pipe 3, the heater 5 started to heat, the ammonium paratungstate solution boiled and evaporated, the steam pump 603 started when the steam generated, the steam and the ammonia gas evaporated by the ammonium paratungstate transported into the space between the partition plate 601 and the inclined plate 703, the steam pump 603 pressurized, the inclined plate 703 moved downward under the pressure of the steam and the ammonia gas, the steam and the ammonia gas transported to the alkali lime bag 707 at this time, the water in the steam absorbed by the alkali lime bag 707, and the ammonia gas filtered out, so that the ammonia gas transported to the other side of the alkali lime bag 707 for storage.

[0042] In addition, as shown in the drawings, Figures 4-7As shown, in one embodiment, the excretion assembly 8 includes a horizontal plate 801, a through hole 802 is formed in the middle of the horizontal plate 801, a check valve 803 is installed at one end of the horizontal plate 801 away from the lime bag 707, a sealing plate 804 is connected to the outside of the housing 1 at the horizontal plate 801, and the sealing plate 804 blocks the through hole 802, the other end of the check valve 803 is installed with an excretion pipe 805, the outside top end of the excretion pipe 805 is installed with an annular cavity pipe 806, a positioning ring 807 is connected to the inside of the annular cavity pipe 806, the top of the excretion pipe 805 is connected with an excretion cavity pipe 808, a part of the outside of the excretion cavity pipe 808 located in the excretion pipe 805 is formed with an excretion port 809, the inside of the positioning ring 807 is connected with the outside of the excretion cavity pipe 808 through a connecting rod, the screening assembly 9 includes a sieve chute 901, the sieve chute 901 is symmetrically formed in the evaporation barrel 2, and the sieve chute 901 on the side close to the excretion pipe 805 is T-shaped, a sieve dividing plate 902 is slidingly installed between the sieve chutes 901, the sieve dividing plate 902 is installed with a sieve sliding plate 903 at one end close to the T-shaped sieve chute 901, drive rods 904 are symmetrically installed at one end of the sieve sliding plate 903 close to the excretion cavity pipe 808, the drive rods 904 extend to the outside of the evaporation barrel 2 and are installed with a triangular plate 905, the triangular plate 905 is installed with a drive spring 906 between the evaporation barrel 2, a number of soft rods 907 equal to the sieve holes of the sieve dividing plate 902 are installed on the bottom end of the evaporation barrel 2 through a support plate, and the soft rods 907 extend into the sieve holes and are processed to form a spherical surface, the top end of the soft rod 907 is formed with a sieve groove 908 at the spherical surface, a heat insulation layer is coated on the inner wall of the evaporation barrel 2, after the evaporation of ammonium paratungstate is completed, cooling is performed, and after cooling is completed, the sealing plate 804 in the horizontal plate 801 is pulled out, but the sealing plate 804 is not completely pulled out, that is, the through hole 802 is communicated with the check valve 803, at this time, because the internal air pressure is high, the high-pressure ammonia gas in the excretion pipe 805 is transported through the check valve 803, then the high-pressure ammonia gas in the excretion pipe 805 pushes the excretion cavity pipe 808 to move outward, when the air pressure in the excretion pipe 805 is greater than the air pressure in the annular cavity pipe 806, the excretion cavity pipe 808 is pushed to move outward, then the movement of the excretion cavity pipe 808 pushes the movement of the triangular plate 905, at the same time, the sieve dividing plate 902 slides in the sieve chute 901, at this time, the ammonia gas in the excretion cavity pipe 808 is discharged through the excretion port 809, the internal air pressure is reduced, then the excretion cavity pipe 808 returns to the original position, and the sieve dividing plate is reset through the drive spring 906, so that the evaporation barrel 2 is driven and screened by the reciprocating movement of the sieve dividing plate 902, in addition, the movement of the sieve dividing plate 902 pushes the soft rod 907 to make the soft rod 907 tilt, so that the sieve groove 908 on the soft rod 907 rotates downward, and the fine ammonium paratungstate crystals are taken away,The impurities will be left above, thereby screening without affecting the storage solution. After the work is completed, the plug on the shell 1 is pulled out, the ammonia gas in the shell 1 is pumped out, the discharged ammonia gas is collected, and the filtered water is collected by the water pump for next use.

[0043] An ultrafine ammonium paratungstate evaporation crystallization device includes the following steps:

[0044] S101, the ammonium paratungstate solution is transported into the evaporation barrel through the feeding pipe;

[0045] S102, the heater is started to heat the solution on the screening plate until boiling starts to evaporate;

[0046] S103, the steam pump is started to transport the evaporated steam and ammonia gas into the shell through the one-way valve and pressurize, and the gas pressure increase will push the inclined plate to move downward, and then the steam and ammonia gas are transported to the bottom of the shell;

[0047] S104, the water vapor is absorbed by the lime bag, and the ammonia gas is filtered to the other side of the lime bag;

[0048] S105, after the evaporation is completed, cooling is performed, and the sealing plate is pulled out after cooling;

[0049] S106, as the internal ammonia gas continues to be output, the gradual increase of the internal gas pressure will push the exhaust cavity pipe to drive the screening assembly to screen;

[0050] S107, the exhaust cavity pipe is pushed to exhaust through the exhaust port, and then returns to the original state, and the above steps are repeated by the increase of the internal gas pressure;

[0051] S108, the ammonia gas is recovered through the connecting pipeline at the exhaust, and the water is recovered through the connecting pipeline at the steam filtering.

[0052] Based on S106, the gas pressure in the exhaust pipe is greater than the gas pressure in the annular cavity pipe, and the ammonia gas is discharged through the exhaust port.

[0053] Through the above method, when working, the water vapor and ammonia gas evaporated and separated during the crystallization of ammonium paratungstate can be recovered and separated, the pressurized ammonia gas can be used to start the screening device, and the separation device and the screening device in the existing device are omitted, thereby greatly increasing the efficiency of the device in use for crystallization of ammonium paratungstate.

[0054] Based on the above scheme, the working principle or operation process of the application in practical application is as follows: the ammonium paratungstate solution is delivered into the evaporation barrel 2 through the feed pipe 3, then the feed pipe 3 is sealed, the heater 5 is started to heat, so that the ammonium paratungstate solution is boiled and evaporated, when the steam appears, the steam pump 603 is started, when the steam pump 603 is started, the steam and ammonia gas evaporated from the ammonium paratungstate are delivered into the space between the partition plate 601 and the inclined plate 703, at the same time, the steam pump 603 is pressurized, so that the inclined plate 703 moves downward under the pressure of the steam and ammonia gas, at this time, the steam and ammonia gas will be delivered to the soda lime bag 707 along with the downward movement of the inclined plate 703, the water in the water vapor is absorbed by the soda lime bag 707, and the ammonia gas is filtered out, so that the ammonia gas is delivered to the other side of the soda lime bag 707 for storage, at this time, after the evaporation of ammonium paratungstate is completed, cooling is carried out, after cooling is completed, the sealing plate 804 in the horizontal plate 801 is pulled out, and the sealing plate 804 is not completely pulled out, that is, the through hole 802 is communicated with the check valve 803, at this time, because the internal air pressure is high, the ammonia gas in the discharge pipe 805 is delivered through the check valve 803, then the high-pressure ammonia gas in the discharge pipe 805 pushes the discharge cavity pipe 808 outward, when the air pressure in the discharge pipe 805 is greater than the air pressure in the annular cavity pipe 806, the discharge cavity pipe 808 is pushed outward, then the movement of the discharge cavity pipe 808 pushes the movement of the triangular plate 905, at the same time, the sieve plate 902 slides in the sieve chute 901, at this time, the ammonia gas in the discharge cavity pipe 808 is discharged through the discharge port 809, the internal air pressure is reduced, then the discharge cavity pipe 808 returns to the original position, the sieve plate is reset by the driving spring 906, so that the sieve plate 902 in the evaporation barrel 2 is driven and sieved in a reciprocating manner, in addition, the movement of the sieve plate 902 pushes the soft rod 907 when sieving, so that the soft rod 907 is inclined, so that the sieve groove 908 on the soft rod 907 rotates downward, and the fine ammonium paratungstate crystals are taken away, and the impurities are left above, so that sieving is carried out without affecting the storage solution.

[0055] With the above scheme of the application, the steam and ammonia gas generated during evaporation can be used twice when the application is working, and the ammonia gas and steam can be filtered at the same time, and the high-energy high-pressure ammonia gas can drive the sieve assembly 9 to sieve the ammonium paratungstate crystals, so that the device for separating ammonia gas and water vapor is not needed when the ammonium paratungstate is crystallized, and the working efficiency is greatly improved.

[0056] The above only describes the preferred embodiments of the application and is not intended to limit the application, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. An ultrafine ammonium paratungstate evaporation and crystallization apparatus, comprising a shell (1), characterized in that, An evaporation tank (2) is installed in the middle of the top of the outer shell (1). A feed pipe (3) and a collection pipe (4) are installed at the top of the evaporation tank (2). The other end of the collection pipe (4) is connected to the outer shell (1) and the collection pipe (4) is U-shaped. A heater (5) is installed at the bottom of the evaporation tank (2). A collection assembly (6) is installed in the outer shell (1) through the collection pipe (4). A flow guiding assembly (7) is installed at the bottom of the outer shell (1). A discharge assembly (8) is installed at the end of the outer shell (1) away from the collection pipe (4). A screening assembly (9) is connected to the evaporation tank (2) through the discharge assembly (8). The collecting assembly (6) includes a partition (601) installed between the inner wall of the outer shell (1) and the evaporation tank (2), and a one-way valve (602) is installed on the partition (601). The collecting pipe (4) extends into the outer shell (1) and is connected to the one-way valve (602). A steam pump (603) is installed at the other end of the one-way valve (602). The steam pump (603) is installed at the bottom end of the partition (601), and the output end of the steam pump (603) faces downward. A soda lime bag (707) is inclinedly arranged in the middle of the bottom of the outer shell (1). The excretion assembly (8) includes a horizontal plate (801), a through hole (802) is provided in the middle of the horizontal plate (801), a check valve (803) is installed at the end of the horizontal plate (801) away from the soda lime bag (707), a sealing plate (804) is piston-connected to the outer side of the outer shell (1) at the horizontal plate (801), and the sealing plate (804) blocks the through hole (802), and an excretion pipe (805) is installed at the other end of the check valve (803); An annular cavity tube (806) is installed at the outer top of the discharge tube (805). A positioning ring (807) is connected to the piston inside the annular cavity tube (806). A discharge cavity tube (808) is connected to the piston at the top of the discharge tube (805). A discharge port (809) is opened on the outer part of the discharge cavity tube (808) located inside the discharge tube (805). The inner side of the positioning ring (807) is connected to the outer side of the discharge cavity tube (808) through a connecting rod. The screening assembly (9) includes a screen chute (901) symmetrically arranged inside the evaporation tank (2). The screen chute (901) near the drain pipe (805) is T-shaped. A slidable screening plate (902) is installed between the screen chute (901). A screening slide plate (903) is installed at one end of the screening plate (902) near the T-shaped screen chute (901). A drive rod (904) is symmetrically installed at one end of the screening slide plate (903) near the drain pipe (808). The drive rod (904) extends to the outside of the evaporation tank (2) and is fitted with a triangular plate (905). The triangular plate (905) is aligned with the... A drive spring (906) is installed between the evaporation tanks (2). The bottom of the evaporation tank (2) is equipped with a number of soft rods (907) equal to the number of sieve holes of the sieve plate (902) by a support plate. The soft rods (907) extend into the sieve holes and are processed to form a spherical surface. The top of the soft rods (907) is provided with a sieve groove (908) at the spherical surface. When the air pressure in the drain pipe (805) is greater than the air pressure in the annular cavity (806), the drain pipe (808) will be pushed to move outward. Then, the movement of the drain pipe (808) will push the triangular plate (905) to move, and at the same time, the sieve plate (902) will be pushed to slide in the sieve groove (901).

2. The ultrafine ammonium paratungstate evaporation and crystallization apparatus according to claim 1, characterized in that, The flow guiding assembly (7) includes a telescopic rod (701), which is installed inside the housing (1) directly below the partition (601). A return spring (702) is sleeved on the outside of the telescopic rod (701). An inclined plate (703) is installed at the top of the telescopic rod (701). The inclined plate (703) is inclined toward the evaporator (2), and the downward inclined bottom end is attached to the bottom angle of the evaporator (2).

3. The ultrafine ammonium paratungstate evaporation and crystallization apparatus according to claim 2, characterized in that, A sliding plate (704) is fixedly installed at the bottom of the inclined plate (703) that is tilted downwards. A retaining plate (705) is installed at the bottom of the inner end of the outer shell (1) directly below the sliding plate (704). A cavity (706) is formed between the groove on the retaining plate (705) and the inner wall of the outer shell (1). The sliding plate (704) is inserted into the retaining plate (705) and slidably connected with the groove in the retaining plate (705).

4. The ultrafine ammonium paratungstate evaporation and crystallization apparatus according to claim 2, characterized in that, The top of the soda lime bag (707) is connected to the bottom of the evaporator (2) near the corner of the inclined plate (703), and the bottom of the soda lime bag (707) is connected to the middle of the bottom of the outer shell (1).

5. The ultrafine ammonium paratungstate evaporation and crystallization apparatus according to claim 1, characterized in that, The inner wall of the evaporator (2) is coated with a heat insulation layer.

6. A method for evaporating and crystallizing fine ammonium paratungstate, characterized in that, An ultrafine ammonium paratungstate evaporation and crystallization apparatus according to any one of claims 1-3 includes the following steps: S101, Ammonium paratungstate solution is conveyed to the evaporation tank through the feed pipe; S102, At this time, the heater is started to heat the solution on the sieve plate until it boils and begins to evaporate; S103, start the steam pump, and deliver the evaporated steam and ammonia to the shell through the one-way valve and pressurize it. As the pressure increases, it will push the inclined plate downward, and then the steam and ammonia will be delivered to the bottom of the shell. S104, water vapor is absorbed by the soda lime bag, while ammonia is filtered to the other side of the soda lime bag; S105, after evaporation is complete, cool it down, and then pull out the sealing plate; S106, as the internal ammonia gas is continuously output, the internal gas pressure gradually increases, which will push the discharge chamber pipe and drive the screening component to perform screening. S107, pushing the discharge tube will release air through the discharge port, and then return to its original state. The above steps are repeated by increasing the internal air pressure. S108, a connecting pipe is installed at the exhaust outlet to recover ammonia, and a connecting pipe is installed at the steam filter to recover water. Based on the fact that S106, as ammonia is output, the gas pressure in its discharge pipe is greater than the gas pressure inside the annular cavity tube before it is discharged through the discharge port.

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