Reconcentration evaporator for rhenium-containing solutions

Abstract

The utility model discloses the technical field's concentrated evaporation kettle of rhenium-containing liquid includes the sealed evaporation chamber, is provided with the stirring system in the evaporation chamber, the evaporation chamber still has the condensation system, and the bottom of evaporation chamber is provided with the discharge gate, and the discharge gate is connected with the discharge valve, the stirring system includes the stirring rod that inserts its inside from the evaporation chamber top, and the stirring rod fixed has two layers of paddles in the evaporation chamber inside, and the other end of stirring rod is connected with the output end of motor. Through setting the stirring system adaptation high density characteristic of two layers of paddles, ensure that the material is more uniform in the concentration evaporation process, avoid local crystallization deposition, the stainless steel main body plus four fluorine anticorrosion outer lining of stirring rod and paddle can effectively resist the corrosion of rhenium-containing liquid and crystallization product, prolong the service life of equipment.

Description

Technical Field

[0001] This utility model belongs to the field of concentration and evaporation technology, specifically relating to a concentration and evaporation kettle containing rhenium liquid. Background Technology

[0002] In rhenium metal recovery processes, the post-concentration and crystallization stage of rhenium-containing solutions is the core step that determines the quality of the final product, ammonium perrylate, and the rhenium recovery rate. As the target product for the concentration and crystallization of rhenium-containing solutions, ammonium perrylate has unique physicochemical properties, such as high density, easy crystallization, easy corrosion of equipment, and the generation of a large amount of foam due to negative pressure changes during evaporation. These properties place stringent requirements on the adaptability of the concentration and crystallization equipment.

[0003] However, existing concentration and evaporation equipment has many problems in practical applications: the stirring system is difficult to adapt to the high-density ammonium perrylate material during the crystallization process, which easily leads to uneven stirring, and the equipment material is easily corroded by the material, affecting the crystallization efficiency and equipment life.

[0004] An unreasonable discharge structure design can easily lead to blockage of the discharge port due to the adhesion of ammonium permanganate crystals, resulting in operational interruption.

[0005] The connection between the evaporation and cooling processes lacks an effective foam trapping and reflux design, making it easy for foam to enter the cooling system with the steam, resulting in the loss of rhenium and reducing the recovery rate.

[0006] The cooling system is inefficient, and the connecting parts are easily damaged due to material properties or operational vibrations, increasing maintenance costs.

[0007] The limited heating and temperature control range cannot meet the temperature requirements of rhenium-containing liquids at different process stages (such as high-temperature concentration and low-temperature freezing crystallization), thus restricting process flexibility.

[0008] These problems directly lead to low concentration and crystallization efficiency and insufficient concentration ratio of existing equipment, which seriously restricts the effect of concentration and crystallization of rhenium-containing solutions, and consequently affects the quality of ammonium perrylate products and the recovery benefits of rhenium metal. Utility Model Content

[0009] The purpose of this invention is to provide a rhenium-containing liquid concentration and evaporation kettle to improve the concentration and crystallization efficiency of rhenium-containing liquid.

[0010] The technical solution adopted in this utility model is: a rhenium-containing liquid concentration evaporator, including a sealed evaporation chamber, a stirring system is provided in the evaporation chamber, the evaporation chamber is also connected to a condensation system, and a discharge port is opened at the bottom of the evaporation chamber, and a discharge valve is connected to the discharge port;

[0011] The stirring system includes a stirring rod inserted into the top of the evaporation chamber. The stirring rod inside the evaporation chamber has two layers of blades fixed to it, and the other end of the stirring rod is connected to the output end of the motor.

[0012] The present invention is further characterized in that: both the stirring rod and the blade are made of stainless steel, and the outer surface of the stainless steel body is covered with a polytetrafluoroethylene lining.

[0013] The discharge valve is a top-mounted rotary discharge valve, which is connected to the discharge port by a snap-fit, and the discharge valve outlet is vertically downward.

[0014] The evaporation chamber and the condensation system are connected by a connecting pipe. The end of the connecting pipe closest to the evaporation chamber is the inlet, and the other end is the outlet. The diameter of the outlet pipe is larger than that of the inlet pipe, and the entire connecting pipe is inclined, forming a slope where the inlet end is lower than the outlet end.

[0015] A foam trap made of polytetrafluoroethylene is installed in the middle of the connecting pipe. The foam trap is circular and has several through holes evenly distributed on its surface. The diameter of each through hole is no more than 0.5 cm.

[0016] The condensation system includes a condenser and a condenser flask, which are connected by a PTFE hose.

[0017] The condenser flask is placed on a movable flask holder, and the evaporation chamber is placed on a movable rack.

[0018] There are at least two condensation systems.

[0019] The outer surface of the evaporator is covered with a jacket, and a closed cavity is formed between the jacket and the outer wall of the evaporator.

[0020] There is a through-hole thermometer inserted into the top of the evaporation chamber.

[0021] The beneficial effects of this utility model are:

[0022] 1. This utility model adapts the high-density characteristics of crystalline ammonium permanganate by setting up a stirring system with upper and lower layers of blades, ensuring more uniform stirring of materials during the concentration and evaporation process and avoiding local crystal deposition; the stirring rod and blades are made of stainless steel body with PTFE anti-corrosion lining, which can effectively resist the corrosion of rhenium-containing liquid and crystal products, and extend the service life of the equipment.

[0023] 2. This utility model adopts a top-mounted rotary discharge valve, which, with a snap-fit ​​connection and a vertically downward outlet, can adapt to the physical characteristics of ammonium perrylate crystallization, reduce material retention at the discharge port, effectively avoid blockage, and ensure smooth discharge.

[0024] 3. The foam trap between the evaporation chamber and the condensation system of this utility model can effectively prevent the boiling foam of the material caused by the change of negative pressure from entering the condensation system; the slope design of the connecting pipe allows the foam trap liquid to flow back to the evaporation chamber by gravity, directly reducing the risk of rhenium loss with the foam and improving the recovery rate.

[0025] 4. The condenser and condenser bottle of this utility model are connected by a PTFE hose. The PTFE hose is corrosion-resistant and highly flexible, which can reduce the frequency of damage to the connecting pipe caused by equipment vibration or operation.

[0026] 5. This utility model can improve cooling efficiency by setting up at least two condensation systems that can be used in parallel, or one can be used and the other can be kept on standby to ensure production continuity; the dual cooling system is combined with the refrigerant cooling system to adapt to the cooling requirements of different concentration stages. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0028] In the diagram: 1. Condenser, 2. Foam trap, 3. Knob, 4. PTFE hose, 5. Vent port, 7. Exhaust port, 9. Lifting beam, 10. Motor, 11. Thermometer, 12. Stirring rod, 13. Paddle, 14. Discharge valve, 15. Moving frame, 16. Refrigerant inlet, 17. Jacket, 18. Discharge port, 19. Coolant inlet, 20. Interface, 21. Coolant outlet, 22. Condensate bottle, 23. Bottle holder. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0030] Example 1

[0031] This embodiment includes a rhenium liquid concentration and evaporation kettle, such as... Figure 1 As shown, the evaporation chamber includes a sealed chamber, the interior of which is a cavity for concentrating and crystallizing rhenium-containing liquid. A stirring rod 12 is vertically installed through the center of the top of the evaporation chamber, with its upper end extending outside the chamber and fixedly connected to the output shaft of a motor 10. The motor 10 drives the stirring rod 12 to rotate around its own axis. Two layers of flat, bladed blades 13 are fixedly fixed at intervals above and below the stirring rod 12 within the evaporation chamber. These blades are horizontally distributed on both sides of the stirring rod 12 and, as the stirring rod 12 rotates, create a uniform up-and-down agitation of the material within the evaporation chamber. A discharge port 18 is located at the center of the bottom of the evaporation chamber, and a discharge valve 14 is connected below the discharge port 18. The opening at the top of the evaporation chamber is also connected to a condensation system via pipes and interfaces, allowing the steam generated during evaporation to enter the condensation system for processing.

[0032] Example 2

[0033] Based on Example 1, in this example:

[0034] Both the stirring rod 12 and the two layers of blades 13 are made of stainless steel as the main material. The stainless steel material ensures the structural strength of the stirring components and can withstand the impact of materials during stirring. The outer surface of the stainless steel body is entirely covered with a layer of polytetrafluoroethylene (PTFE), which adheres tightly to the stainless steel surface. PTFE is corrosion-resistant and effectively isolates the stainless steel from the corrosion caused by rhenium-containing liquids and the crystallization product ammonium rheniumate, while also reducing the adhesion of materials to the surface of the stirring components, ensuring the stability of the stirring efficiency.

[0035] Example 3

[0036] Based on Example 2, in this example:

[0037] The discharge valve 14 is a top-mounted knob structure. Its upper part connects quickly and seals to the discharge port 18 at the bottom of the evaporation chamber via a snap-fit ​​mechanism. This snap-fit ​​connection facilitates disassembly and cleaning later. The lower port of the discharge valve 14 is circular, with its bottom surface at least 20cm above the ground, and the outlet direction is vertically downwards. This structure allows for the placement of a receiving container below the discharge port and utilizes the material's own gravity to facilitate smooth discharge, preventing the accumulation and blockage of crystallized material at the outlet.

[0038] Example 4

[0039] Based on Example 3, in this example:

[0040] The condensation system includes a condenser 1 and a condenser flask 22. The inlet of the condenser 1 is connected to the inlet of the evaporation chamber via a pipe, and the outlet of the condenser 1 is connected to the inlet of the condenser flask 22 via a PTFE hose 4. The PTFE hose 4 has a diameter of 10cm, and its two ends are fixed to the outlet of the condenser 1 and the inlet of the condenser flask 22 respectively by clips. The flexibility of the hose can reduce the damage to the connection parts caused by equipment vibration. The condenser flask 22 is placed on a movable flask holder 23, and the bottom of the flask holder is equipped with casters with locking function. The evaporation chamber is fixed on a movable frame 15, and the bottom of the movable frame 15 is also equipped with lockable casters, which facilitates the overall or partial adjustment of the equipment position.

[0041] A knob 3 is installed at the outlet of condenser 1. By rotating it, the passage between condenser 1 and condenser bottle 22 can be directly controlled to open or close, facilitating flexible control of the condensation system's operating status. A coolant inlet 19 is located at the top of condenser 1, and a coolant outlet 21 is located at the bottom, forming a top-to-bottom coolant circulation path. When the steam generated in the evaporation chamber enters through the air inlet at the bottom of condenser 1, it forms a counter-current contact with the coolant flowing in from the top coolant inlet 19. Through efficient heat exchange, the steam condenses into a liquid state, ensuring condensation efficiency while allowing the condensed liquid to flow towards condenser bottle 22 via gravity.

[0042] The top of the condenser bottle 22 is provided with a vent 5 and the bottom is provided with a drain 7. When the liquid level in the condenser bottle 22 is high, the knob 3 is closed, the vent 5 is opened to cut off the negative pressure at the condenser bottle 22, and then the drain 7 is opened to drain the liquid. After the liquid is drained, the drain 7 is closed and the knob 3 is opened to complete the condensation operation.

[0043] The condensing system comprises at least two independent condenser 1 and condenser bottle 22 combinations. The steam inlet of the two combinations is connected to the steam outlet of the evaporation chamber via a three-way valve. Flexible switching can be achieved by adjusting the opening and closing state of the three-way valve: when it is necessary to improve condensing efficiency, the steam inlet valve is fully opened, and steam enters both condensers 1 simultaneously. After being collected by their respective condenser bottles 22, the steam is combined to form a parallel operation mode; when it is necessary to inspect or maintain one of the combinations, the steam inlet valve of that combination is closed, leaving only the valve of the other combination open, which can switch to the "one in use, one standby" mode to ensure continuous and uninterrupted operation of the condensing system.

[0044] Example 5

[0045] Based on Example 4, in this example:

[0046] The evaporator chamber and condenser 1 are connected by a horizontal connecting pipe. The end of the connecting pipe closer to the evaporator chamber is the inlet, and the end closer to the condenser 1 is the outlet. The outlet diameter is larger than the inlet diameter, and the entire connecting pipe is inclined, with the inlet end slightly lower and the outlet end slightly higher, forming a certain slope. A polytetrafluoroethylene (PTFE) foam trap 2 is installed in the middle of the connecting pipe. The foam trap 2 is circular, with multiple circular through holes of no more than 0.5 cm in diameter evenly distributed on its surface. The foam trap 2 is fixed to the connecting pipe by a clip 20 and can be quickly and manually removed for cleaning. The foam trap prevents foam generated by negative pressure changes in the evaporator chamber from entering the cooling chamber, while the captured liquid can flow back to the evaporator chamber along the slope of the connecting pipe.

[0047] Example 6

[0048] Based on Example 5, in this example:

[0049] The outer wall of the evaporation chamber is covered by a jacket 17, forming a closed cavity between the jacket 17 and the outer wall of the evaporation chamber. A refrigerant inlet 16 is provided on the upper side wall of the cavity for filling the cavity with heating oil. The temperature of the material in the evaporation chamber can be adjusted by regulating the temperature of the heating oil to meet the concentration or freeze crystallization requirements of different processes. A vertically inserted thermometer 11 is also inserted into the material in the evaporation chamber at the top of the evaporation chamber. The sensing end of the thermometer 11 extends into the material in the evaporation chamber, while the dial is exposed outside the evaporation chamber. It can monitor and display the temperature of the material in real time, providing a basis for adjusting process parameters.

[0050] When using:

[0051] First, check the sealing performance of the evaporation chamber to ensure that the stirring system and condensation system are tightly connected; inject the rhenium-containing liquid through the feed inlet at the top of the evaporation chamber, ensuring that the liquid level does not exceed 2 / 3 of the evaporation chamber volume; inject heating oil into the jacket 17 according to process requirements, and adjust the direct-insertion thermometer to the monitoring state; open the refrigerant inlet 16 of the condensation system to put the condenser 1 into operation.

[0052] Next, the motor is turned on, driving the stirring rod 12 to rotate the upper and lower blades 13 (the speed can be adjusted according to the material concentration) to ensure that the rhenium-containing liquid is mixed evenly; the temperature of the evaporation chamber is controlled by heating oil through the jacket 17 (e.g., set to 80-100℃ for the high-temperature concentration stage and -5-5℃ for the freezing crystallization stage), and the direct-insertion temperature gauge 11 displays the material temperature in real time to ensure stable operation within the set range.

[0053] Next, the steam generated by the evaporation of the rhenium-containing liquid under heating and stirring enters the condenser 1 through the connecting pipe between the evaporation chamber and the condensation system; when the steam flows through the foam trap 2, the foam is intercepted, and the liquid flows back to the evaporation chamber along the inclined connecting pipe, reducing rhenium loss; the steam is condensed into liquid in the condenser and flows into the condenser bottle 22 for collection through the PTFE hose 4.

[0054] When the ammonium perrylate concentration in the evaporation chamber reaches the crystallization condition, maintain the temperature and continue stirring until crystallization is complete; turn off the heating system, and after the material has cooled slightly, rotate the top-mounted knob discharge valve 14, and the crystallized product will be discharged from the vertically downward outlet. The tail liquid can be treated again.

[0055] Finally, after stopping the machine, disassemble the clip-connected discharge valve 14, foam trap 2, and PTFE hose 4, and rinse the residual material with clean water; lift the stirring system using the manual lifting device 9, and inspect the PTFE lining of the blades 13 and stirring rod 12; move the lockable bottle holder 23 of the condenser flask 22 and the movable frame 15 of the evaporation chamber, clean the area around the equipment, and complete the maintenance.

[0056] This invention employs a dual cooling system and a refrigerant cooling system. The device has been modified and upgraded to address the specific working conditions of the rhenium-containing liquid concentration and evaporation process in terms of material stirring, material discharge, foam capture during evaporation, condensate discharge, and equipment maintenance platform. This effectively improves the concentration efficiency and rhenium recovery rate of the rhenium-containing liquid evaporation and crystallization process.

[0057] In the description of the embodiments of this utility model, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A rhenium-containing liquid concentration and evaporation kettle, characterized in that, It includes a sealed evaporation chamber, a stirring system is installed inside the evaporation chamber, and a condensation system is also connected to the evaporation chamber. A discharge port (18) is opened at the bottom of the evaporation chamber, and a discharge valve (14) is connected to the discharge port (18). The stirring system includes a stirring rod (12) inserted into the evaporation chamber from the top. The stirring rod (12) located inside the evaporation chamber is fixed with two layers of blades (13). The other end of the stirring rod (12) is connected to the output end of the motor (10).

2. The rhenium-containing liquid concentration and evaporation kettle according to claim 1, characterized in that, The stirring rod (12) and the blade (13) are both made of stainless steel, and the stainless steel body is covered with a polytetrafluoroethylene lining.

3. The rhenium-containing liquid concentration and evaporation kettle according to claim 1, characterized in that, The discharge valve (14) is an top-mounted rotary discharge valve, which is connected to the discharge port (18) by a snap fastener. The outlet of the discharge valve (14) is vertically downward.

4. The rhenium-containing liquid concentration and evaporation kettle according to claim 1, characterized in that, The evaporation chamber and the condensation system are connected by a connecting pipe. The end of the connecting pipe closest to the evaporation chamber is the inlet, and the other end is the outlet. The diameter of the outlet pipe is larger than that of the inlet pipe, and the entire connecting pipe is inclined, forming a slope where the inlet end is lower than the outlet end.

5. The rhenium-containing liquid concentration and evaporation kettle according to claim 4, characterized in that, A foam trap (2) made of polytetrafluoroethylene is installed in the middle of the connecting pipe. The foam trap (2) is circular and has several through holes evenly opened on its surface. The diameter of the through holes is no more than 0.5 cm.

6. The rhenium-containing liquid concentration and evaporation kettle according to claim 1, characterized in that, The condensation system includes a condenser (1) and a condenser bottle (22), which are connected by a PTFE hose (4).

7. The rhenium-containing liquid concentration and evaporation kettle according to claim 6, characterized in that, The condenser (22) is placed on a movable bottle holder (23), and the evaporation chamber is placed on a movable frame (15).

8. The rhenium-containing liquid concentration and evaporation kettle according to claim 1, characterized in that, The condensation system has at least two sets.

9. The rhenium-containing liquid concentration and evaporation kettle according to claim 1, characterized in that, The outer surface of the evaporator is covered with a jacket (17), and a closed cavity is formed between the jacket (17) and the outer wall of the evaporator.

10. The rhenium-containing liquid concentration and evaporation vessel according to claim 1, characterized in that, The top of the evaporation chamber has a direct-insertion thermometer (11) inserted inside.

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