Ammonium rhenate evaporative crystallization device

Abstract

The utility model provides an ammonium rhenate evaporative crystallization device which comprises a stock solution pool and a feeding pump which are connected, a discharging pipe of the feeding pump is connected with an ammonia evaporation structure, the ammonia evaporation structure comprises a first feeding pipe connected with a discharging pipe of the feeding pump, one end of the first feeding pipe is connected with a first heat exchanger, and the other end of the first feeding pipe is connected with a second heat exchanger. The second end of the first feeding pipe is connected with one end of a discharging pump, the top of the first heat exchanger is connected with an evaporator, the leaching tower is arranged, so that ammonia gas is effectively prevented from overflowing in the evaporation process, and the vacuum pump is arranged, so that the stability of negative pressure is effectively ensured; a mist eliminator is arranged on the evaporator, and a primary circulating water pump is arranged, so that the rhenium-containing liquid is effectively prevented from overflowing; effective transfer of heat is ensured by arranging the second heat exchanger, the crystallization efficiency of the whole system is ensured by arranging the freezing crystallization tank, and the technical problem that the evaporation crystallization efficiency of an existing ammonium perrhenate evaporation crystallization device is low is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of preparation of hydrometallurgical chemical products and relates to a crystallization device, in particular to an ammonium rhenate evaporation crystallization device. Background Art

[0002] In the rhenium metal recovery system, the evaporation and crystallization of rhenium-containing liquid is a key link in production. Due to the special physical and chemical properties of rhenium-containing liquid, the conventional room temperature and pressure evaporation process equipment used in the existing industry has low evaporation efficiency and is unsafe and environmentally unfriendly, and cannot meet the production needs of high-quality rhenium products. After summary, there are mainly the following defects. In order to eliminate the following equipment drawbacks, it is necessary to innovate technology and develop a new evaporation and crystallization device suitable for ammonium perrhenate.

[0003] (1) Low evaporation efficiency. The rhenium-containing liquid has a high boiling point at room temperature, and the temperature required for evaporation is high, resulting in low evaporation efficiency. (2) Large evaporation losses. The cooling efficiency of existing coolers is not high, causing rhenium to enter the cooling water and be discharged, resulting in waste of rhenium metal. (3) Low crystallization efficiency. During the room temperature crystallization process, the crystallization time is long, the crystal form is uneven, and the rhenium concentration in the tail liquid is high. (4) High environmental risks. The rhenium-containing liquid contains a large amount of ammonia water. During the evaporation process, a large amount of ammonia gas overflows from the system, causing environmental pollution. (5) Low degree of automation. The working environment conditions of operators are poor and the work intensity is high. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide an ammonium perrhenate evaporation crystallization device to solve the technical problem of low evaporation crystallization efficiency of the existing ammonium perrhenate evaporation crystallization device.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] An ammonium rhenate evaporation crystallization device comprises a connected raw liquid pool and a feed pump, the discharge pipe of the feed pump is connected to an ammonia evaporation structure, the ammonia evaporation structure comprises a first feed pipe connected to the discharge pipe of the feed pump, one end of the first feed pipe is connected to a first heat exchanger, the second end of the first feed pipe is connected to one end of the discharge pump, the top of the first heat exchanger is connected to an evaporator, the bottom of the evaporator is connected to the other end of the discharge pump through the first discharge pipe, the upper half of the evaporator is provided with a foam catcher, the upper half of the evaporator is connected to a condenser through a first branch pipe, a condensation reflux device is provided on the first branch pipe, the bottom of the condensation reflux device is connected to the evaporator, and the bottom of the condenser is respectively connected to a condensate discharge structure and a negative pressure extraction structure through a first water outlet pipe;

[0007] The discharge pipe is provided with a feed regulating valve, the first feed pipe is provided with a first valve, the first discharge pipe is provided with a second valve, the first feed pipe between the first valve and the discharge pipe is connected with a second discharge pipe, the end of the second discharge pipe is provided with a freezing crystallization tank, and the second discharge pipe is provided with a third valve;

[0008] The condensed water discharge structure includes a condensed water tank connected to the first water outlet pipe and a spare condensed water tank, the bottom of the condensed water tank is connected to the second condensed water pump, the bottom of the spare condensed water tank is connected to the first condensed water pump, and the first condensed water pump is connected to the second condensed water pump;

[0009] The negative pressure extraction structure includes a vacuum pump connected to the first water outlet pipe, the top of the vacuum pump is connected to a cooler through the first air outlet pipe, the bottom of the cooler is connected to the bottom of the vacuum pump, the side wall of the cooler is connected to a circulating water station, and the top of the cooler is connected to an ammonia recovery structure;

[0010] The ammonia recovery structure comprises a leaching tower connected to the cooler through a first air inlet pipe, the leaching tower is sequentially connected to a circulating water pump and a water storage tank through a second water inlet pipe, the water storage tank is connected to the bottom of the leaching tower, and a gas outlet is opened at the top of the leaching tower;

[0011] It also includes a circulating cooling water structure, which includes a cooling water tank connected to a circulating water station, a primary circulating water pump connected to the bottom of the cooling water tank, the primary circulating water pump is respectively connected to the water inlet ends of a third condensing water pump, a feed pump, a discharge pump, a first condensing water pump and a second condensing water pump, the water outlet ends of the third condensing water pump, the feed pump, the discharge pump, the first condensing water pump and the second condensing water pump are commonly connected to a second heat exchanger, and the second heat exchanger is connected to the circulating water station; the third condensing water pump is connected to a steam condensing water tank, and the steam condensing water tank is connected to the first heat exchanger; a circulating loop is arranged between the circulating water station and the condenser.

[0012] The utility model also includes the following technical features:

[0013] A viewing window is arranged on the side wall of the lower half of the evaporator.

[0014] The freezing crystallization tank is provided with a thermometer.

[0015] A magnetic flap level gauge is arranged in the standby condensate water tank.

[0016] The second heat exchanger is a plate heat exchanger.

[0017] The foam catcher is a horizontal plate arranged on the inner wall of the evaporator in a staggered manner.

[0018] The bottom of the cooler and the vacuum pump are provided with water supply valves.

[0019] The freezing crystallization tank is connected with a compressor unit.

[0020] The first heat exchanger is provided with a steam inlet valve.

[0021] The cooling water tank is arranged to be open.

[0022] Compared with the prior art, the utility model has the following beneficial technical effects:

[0023] The utility model effectively prevents ammonia from overflowing during the evaporation process by arranging a leaching tower, and effectively ensures the stability of negative pressure by arranging a vacuum pump; effectively prevents rhenium-containing liquid from overflowing by installing a foam catcher on the evaporator and arranging a primary circulation water pump; ensures effective heat transfer by arranging a second heat exchanger, and ensures the overall crystallization efficiency of the system by arranging a freezing crystallization tank, thereby solving the technical problem of low evaporation crystallization efficiency of the existing ammonium perrhenate evaporation crystallization device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the overall structural diagram of this device.

[0025] The meanings of the various numbers in the figure are: cooling water tank 1, second heat exchanger 2, steam regulating valve 3, first heat exchanger 4, foam trap 5, evaporator 6, window 7, steam condensate tank 8, feed regulating valve 9, primary circulation water pump 10, third condensate pump 11, feed pump 12, discharge pump 13, first condensate pump 14, second condensate pump 15, condenser 16, condensate tank 17, spare condensate tank 18, magnetic flap level gauge 19, first air inlet pipe 20, cooler 2 1, vacuum pump 22, water supply valve 23, elution tower 24, water storage tank 25, circulating water pump 26, circulating water station 27, compressor unit 28, thermometer 29, freezing crystallization tank 30, raw liquid pool 31, first feed pipe 32, first discharge pipe 33, first branch pipe 34, condenser reflux device 35, first water outlet pipe 36, first valve 37, second valve 38, second discharge pipe 39, third valve 40, first air outlet pipe 41, second water inlet pipe 42, circulation loop 43;

[0026] Discharge pipe 1201, discharge pipe 1202.

[0027] The specific contents of the utility model are further explained in detail below in conjunction with the embodiments. DETAILED DESCRIPTION

[0028] It should be noted that, unless otherwise specified, all components in the present invention are components known in the art.

[0029] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of the present application fall within the protection scope of the present invention.

[0030] The utility model provides an ammonium rhenate evaporation crystallization device, comprising a connected raw liquid pool 31 and a feed pump 12, wherein an ammonia evaporation structure is connected to a discharge pipe 1202 of the feed pump 12, wherein the ammonia evaporation structure comprises a first feed pipe 32 connected to the discharge pipe 1202 of the feed pump 12, wherein one end of the first feed pipe 32 is connected to a first heat exchanger 4, wherein a second end of the first feed pipe 32 is connected to one end of a discharge pump 13, wherein an evaporator 6 is connected to the top of the first heat exchanger 4, wherein the bottom of the evaporator 6 is connected to the other end of the discharge pump 13 through a first discharge pipe 33, wherein a foam catcher 5 is provided at the upper half of the evaporator 6, wherein the upper half of the evaporator 6 is connected to a condenser 16 through a first branch pipe 34, wherein a condensation reflux device 35 is provided on the first branch pipe 34, wherein the bottom of the condensation reflux device 35 is connected to the evaporator 6, wherein the bottom of the condenser 16 is respectively connected to a condensate discharge structure and a negative pressure extraction structure through a first water outlet pipe 36;

[0031] The discharge pipe 1202 is provided with a feed regulating valve 9, the first feed pipe 32 is provided with a first valve 37, the first discharge pipe 33 is provided with a second valve 38, the first feed pipe 32 between the first valve 37 and the discharge pipe 1202 is connected with a second discharge pipe 39, the end of the second discharge pipe 39 is provided with a freezing crystallization tank 30, and the second discharge pipe 39 is provided with a third valve 40;

[0032] The condensed water discharge structure includes a condensed water tank 17 and a standby condensed water tank 18 connected to the first water outlet pipe 36, the bottom of the condensed water tank 17 is connected to the second condensed water pump 15, the bottom of the standby condensed water tank 18 is connected to the first condensed water pump 14, and the first condensed water pump 14 is connected to the second condensed water pump 15;

[0033] The negative pressure extraction structure includes a vacuum pump 22 connected to a first water outlet pipe 36, the top of the vacuum pump 22 is connected to a cooler 21 through a first air outlet pipe 41, the bottom of the cooler 21 is connected to the bottom of the vacuum pump 22, a circulating water station 27 is connected to the side wall of the cooler 21, and the top of the cooler 21 is connected to an ammonia recovery structure;

[0034] The ammonia recovery structure includes a leaching tower 24 connected to the cooler 21 through a first air inlet pipe 20, the leaching tower 24 is sequentially connected to a circulating water pump 26 and a water storage tank 25 through a second water inlet pipe 42, the water storage tank 25 is connected to the bottom of the leaching tower 24, and a gas outlet is opened at the top of the leaching tower 24;

[0035] It also includes a circulating cooling water structure, which includes a cooling water tank 1 connected to a circulating water station 27, a primary circulating water pump 10 connected to the bottom of the cooling water tank 1, and the water inlets of a third condensing water pump 11, a feed pump 12, a discharge pump 13, a first condensing water pump 14 and a second condensing water pump 15 are respectively connected to the primary circulating water pump 10, and the water outlets of the third condensing water pump 11, the feed pump 12, the discharge pump 13, the first condensing water pump 14 and the second condensing water pump 15 are commonly connected to a second heat exchanger 2, and the second heat exchanger 2 is connected to the circulating water station 27; the third condensing water pump 11 is connected to a steam condensing water tank 8, and the steam condensing water tank 8 is connected to the first heat exchanger 4; a circulating loop 43 is arranged between the circulating water station 27 and the condenser 16.

[0036] Operation of negative pressure pump water circulation system: After the vacuum pump 22 is turned on, the water is discharged to the cooler 21 through the first outlet pipe 41. The cooler is connected to the cooling circulating water. The liquid in the cooler is recycled to the vacuum pump 22 through the water supply valve 23, thereby realizing the water circulation of the water ring vacuum pump and maintaining the process temperature through the cooler.

[0037] Operation of the evaporated ammonia recovery system: After the system is operating normally, the ammonia overflowing from the system enters the elution tower 24 through the first air inlet pipe 20, the circulating water pump 26 is turned on, and the eluent in the water tank 25 is eluted from top to bottom through the second water inlet pipe 42. The eluent in the elution tower 24 is returned to the water tank 25 and recycled to absorb the ammonia overflowing from the evaporation process.

[0038] Operation of the primary circulating water system: the primary water in the cooling water tank 1 passes through the primary circulating water pump 10 and enters the third condensing water pump 11, the feed pump 12, the discharge pump 13, the first condensing water pump 14 and the second condensing water pump 15 in parallel. After the primary water is discharged, it converges and enters the second heat exchanger 2, and returns to the cooling water tank 1 after being cooled by the second heat exchanger 2.

[0039] Foam capture operation during evaporation: During the evaporation of the material, the foam in the evaporator 6 passes through the foam capture device 5 and then enters the condenser 16 for cooling.

[0040] Crystallization discharging operation: After the material reaches the evaporation ratio, the feed regulating valve 9 is closed, the discharging pump 13, the second valve 38 and the third valve 40 are opened, and the evaporated liquid enters the cooling crystallization tank 30 through the second discharging pipe 39.

[0041] Condensate drainage operation under negative pressure state: When the system is operating normally, the condensate can be switched to the condensate tank 17 or the spare condensate tank 18. When the liquid level exceeds the set value, it is discharged through the first condensate pump 14 and the second condensate pump 15. The condensate is discharged by a dual system, which can effectively improve the system operation stability.

[0042] By setting up the elution tower 24, the ammonia gas is effectively prevented from overflowing during the evaporation process, and the vacuum pump 22 is effectively ensured to be stable. By installing the smudge trap 5 on the evaporator 6 and setting up the primary circulation water pump 10, the rhenium-containing liquid is effectively prevented from overflowing. By setting up the second heat exchanger 2, the effective transfer of heat is ensured, and by setting up the freezing crystallization tank 30, the overall crystallization efficiency of the system is ensured, thereby solving the technical problem of low evaporation and crystallization efficiency of the existing ammonium perrhenate evaporation and crystallization device.

[0043] In the above technical solution, the circulating water station is shared instead of one, and the raw liquid pool 31 and the feed pump 12 are connected via the feed pipe 1201 .

[0044] Specifically, a viewing window 7 is provided on the side wall of the lower half of the evaporator 6 for observing the evaporation status of the material during the evaporation process.

[0045] Specifically, the freezing crystallization tank 30 is provided with a thermometer 29 for observing the crystallization control temperature.

[0046] Specifically, a magnetic flap level gauge 19 is provided in the standby condensate water tank 18 for observing the liquid level of the condensate water tank.

[0047] Specifically, the second heat exchanger 2 is a plate heat exchanger.

[0048] Specifically, the foam catcher 5 is a horizontal plate staggeredly arranged on the inner wall of the evaporator 6. Through the S-shaped arrangement, the steam travel is increased and the condensation effect is improved.

[0049] Preferably, the foam catcher 5 is composed of three layers of horizontal plates, and the horizontal plates are composed of 5 mm screens.

[0050] Specifically, a water supply valve 23 is provided between the bottom of the cooler 21 and the vacuum pump 22 , and is used to cut off the water source in the cooler 21 when the vacuum pump 22 is inspected and repaired.

[0051] Specifically, the freezing crystallization tank 30 is connected to a compressor unit 28 for providing refrigeration and cooling the refrigerant.

[0052] Specifically, the first heat exchanger 4 is provided with a steam inlet valve 3 for providing an evaporation heat source.

[0053] Specifically, the cooling water tank 1 is arranged to be open, so as to facilitate observation of leakage during the operation of the equipment.

Claims

1. An ammonium rhenate evaporation crystallization device, comprising a connected stock solution tank (31) and a feed pump (12), characterized in that: The discharge pipe (1202) of the feed pump (12) is connected to an ammonia evaporation structure, and the ammonia evaporation structure includes a first feed pipe (32) connected to the discharge pipe (1202) of the feed pump (12), one end of the first feed pipe (32) is connected to a first heat exchanger (4), the second end of the first feed pipe (32) is connected to one end of the discharge pump (13), the top of the first heat exchanger (4) is connected to an evaporator (6), and the bottom of the evaporator (6) is connected to the first discharge pipe (1202). The material pipe (33) is connected to the other end of the discharge pump (13); the upper half of the evaporator (6) is provided with a foam catcher (5); the upper half of the evaporator (6) is connected to the condenser (16) via a first branch pipe (34); a condenser reflux device (35) is provided on the first branch pipe (34); the bottom of the condenser reflux device (35) is connected to the evaporator (6); the bottom of the condenser (16) is respectively connected to a condensate discharge structure and a negative pressure extraction structure via a first water outlet pipe (36); The discharge pipe (1202) is provided with a feed regulating valve (9), the first feed pipe (32) is provided with a first valve (37), the first discharge pipe (33) is provided with a second valve (38), the first feed pipe (32) between the first valve (37) and the discharge pipe (1202) is connected with a second discharge pipe (39), a freezing crystallization tank (30) is provided at the end of the second discharge pipe (39), and the second discharge pipe (39) is provided with a third valve (40); The condensate discharge structure comprises a condensate tank (17) and a spare condensate tank (18) connected to the first water outlet pipe (36); the bottom of the condensate tank (17) is connected to a second condensate pump (15); the bottom of the spare condensate tank (18) is connected to a first condensate pump (14); the first condensate pump (14) is connected to the second condensate pump (15); The negative pressure extraction structure comprises a vacuum pump (22) connected to a first water outlet pipe (36); the top of the vacuum pump (22) is connected to a cooler (21) via a first air outlet pipe (41); the bottom of the cooler (21) is connected to the bottom of the vacuum pump (22); a circulating water station (27) is connected to the side wall of the cooler (21); and the top of the cooler (21) is connected to an ammonia recovery structure; The ammonia recovery structure comprises a leaching tower (24) connected to the cooler (21) via a first air inlet pipe (20), the leaching tower (24) being connected in sequence to a circulating water pump (26) and a water storage tank (25) via a second water inlet pipe (42), the water storage tank (25) being connected to the bottom of the leaching tower (24), and a gas outlet being provided at the top of the leaching tower (24); The invention also includes a circulating cooling water structure, wherein the circulating cooling water structure includes a cooling water tank (1) connected to a circulating water station (27); the bottom of the cooling water tank (1) is connected to a primary circulating water pump (10); the primary circulating water pump (10) is respectively connected to the water inlet ends of a third condensing water pump (11), a feed pump (12), a discharge pump (13), a first condensing water pump (14) and a second condensing water pump (15); the water outlet ends of the third condensing water pump (11), the feed pump (12), the discharge pump (13), the first condensing water pump (14) and the second condensing water pump (15) are commonly connected to a second heat exchanger (2); the second heat exchanger (2) is connected to the circulating water station (27); the third condensing water pump (11) is connected to a steam condensing water tank (8), and the steam condensing water tank (8) is connected to the first heat exchanger (4); a circulating loop (43) is arranged between the circulating water station (27) and the condenser (16).

2. The ammonium rhenate evaporation crystallization device according to claim 1, characterized in that: A viewing window (7) is provided on the side wall of the lower half of the evaporator (6).

3. The ammonium rhenate evaporation crystallization device according to claim 1, characterized in that: The freezing crystallization tank (30) is provided with a thermometer (29).

4. The ammonium rhenate evaporation crystallization device according to claim 1, characterized in that: A magnetic flap level gauge (19) is arranged in the standby condensate water tank (18).

5. The ammonium rhenate evaporation crystallization device according to claim 1, characterized in that: The second heat exchanger (2) is a plate heat exchanger.

6. The ammonium rhenate evaporation crystallization device according to claim 1, characterized in that: The foam catcher (5) is a horizontal plate arranged on the inner wall of the evaporator (6) in a staggered manner.

7. The ammonium rhenate evaporation crystallization device according to claim 1, characterized in that: A water supply valve (23) is provided at the bottom of the cooler (21) and the vacuum pump (22).

8. The ammonium rhenate evaporation crystallization device according to claim 1, characterized in that: The freezing crystallization tank (30) is connected to a compressor unit (28).

9. The ammonium rhenate evaporation crystallization device according to claim 1, characterized in that: The first heat exchanger (4) is provided with a steam inlet valve (3).

10. The ammonium rhenate evaporation crystallization device according to claim 1, characterized in that: The cooling water tank (1) is arranged to be open.

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