Europium chloride hexahydrate preparation system

Abstract

The utility model discloses a europium chloride hexahydrate preparation system, which comprises a feeding system, a reaction system arranged at the downstream of the feeding system, and a collection system arranged at the downstream of the reaction system, the feeding system comprises a stirring tank and an acid tank which are communicated at an outlet, the reaction system comprises a continuous reactor, and the collection system comprises a finished product tank, an inlet of the stirring tank is connected with a europium oxide powder conveying channel and a purified water conveying channel to prepare europium oxide slurry, a reaction channel and a cooling channel are arranged in the continuous reactor, and heat at the reaction channel can be absorbed by the cooling channel. Europium oxide slurry prepared by the stirring tank reacts with hydrochloric acid, so that the reaction intensity is effectively reduced; a reaction channel and a cooling channel are arranged in the continuous reactor, so that the continuous reactor has extremely high heat transfer efficiency, specific surface area and homogenizing effect, heat can be taken in time, and the sudden boiling phenomenon is avoided. The continuous reactor can realize continuous production of europium chloride hexahydrate, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of preparation of europium trichloride hexahydrate, and particularly relates to a preparation system for europium trichloride hexahydrate. Background Art

[0002] The preparation method of europium trichloride hexahydrate is to dissolve europium oxide in concentrated hydrochloric acid to obtain an aqueous solution of europium trichloride hexahydrate, and the reaction process is a highly exothermic reaction.

[0003] Currently, in the traditional method for preparing europium trichloride hexahydrate, the europium oxide raw material used for reacting with hydrochloric acid is solid europium oxide, and the mixing of europium oxide and hydrochloric acid is generally carried out using equipment such as a beaker, a stirring kettle with a jacket or coil pipes. The solid europium oxide will exacerbate the heat release of the reaction. Directly putting it into the reaction kettle or beaker will make the reaction more intense. The stirring kettle with a jacket or coil pipes is mainly suitable for controlling the temperature of a stable reaction and cannot extract heat in time and control the reaction rate for the violent reaction between hydrochloric acid and europium oxide. The heat generated by the highly exothermic reaction cannot be taken away in time, and it is extremely easy to occur the phenomenon of sudden boiling. The sudden boiling and overflowing of the tank will lead to the risks of equipment damage, environmental pollution and personal injury. Although the method of slowly stirring and preparing with a beaker will reduce the phenomenon of sudden boiling, the production efficiency is very low, and the phenomenon of sudden boiling cannot be completely avoided. And the traditional method is mostly an intermittent production method and cannot achieve continuous production. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is that currently, the preparation reaction of europium trichloride hexahydrate is intense, and the phenomenon of sudden boiling is easy to occur during the reaction, which poses a safety hazard.

[0005] In order to achieve the above object, the utility model provides a preparation system for europium trichloride hexahydrate, including: a feeding system, a reaction system arranged downstream of the feeding system, and a collecting system arranged downstream of the reaction system. The feeding system includes a stirring tank and an acid tank with connected outlets. The reaction system includes a continuous reactor. The collecting system includes a finished product tank. Among them, the inlet of the stirring tank is connected with a europium oxide powder conveying channel and a purified water conveying channel to prepare a europium oxide slurry. The continuous reactor is provided with a reaction channel and a cooling channel, and the heat at the reaction channel can be absorbed by the cooling channel.

[0006] In some embodiments, the stirring tank includes a stirring member, and the stirring member is a turbine stirrer or a blade stirrer.

[0007] In some embodiments, the continuous reactor is a microchannel reactor, including a reaction plate and a heat exchange plate arranged opposite to each other. The reaction channel is arranged in the reaction plate, and the cooling channel is arranged in the heat exchange plate.

[0008] In some embodiments, the reaction channels are formed as continuous and bent multi-segments in the reaction plate along a direction parallel to the length or width of the reaction plate.

[0009] In some embodiments, the diameter of the reaction channels is set to be greater than or equal to 1.5 millimeters.

[0010] In some embodiments, the interval range between the reaction plate and the heat exchange plate is set to be 3 to 5 millimeters.

[0011] In some embodiments, the continuous reactor is a tubular reactor, including a reaction tube and a jacket tube sleeved outside the reaction tube. The reaction channel is arranged in the reaction tube, and the cooling channel is arranged in the jacket tube.

[0012] In some embodiments, the continuous reactor is a tubular reactor, including a reaction tube and a coiled tube sleeved outside the reaction tube. The reaction channel is arranged in the reaction tube, and the cooling channel is arranged in the coiled tube.

[0013] In some embodiments, the number of the continuous reactors is one or more.

[0014] In some embodiments, the feeding system further includes a process air conveying pipeline, on which a pressure controller and a control valve are arranged. The process air conveying pipeline is connected to the inlet of the stirring tank to ensure the pressure stability inside the stirring tank, and the process air conveying pipeline is connected to the inlet of the acid tank to ensure the pressure stability inside the acid tank.

[0015] In some embodiments, a control valve is arranged at the outlet of the stirring tank, a control valve and a hydrochloric acid flowmeter are arranged at the outlet of the acid tank, and a total flowmeter is arranged at the inlet of the continuous reactor to adjust the flow rates of the europium oxide slurry and hydrochloric acid entering the continuous reactor.

[0016] In some embodiments, the collection system further includes an acid circulation pipeline, in which a circulation pump is arranged. The first end of the acid circulation pipeline is communicated with the finished product tank, and the second end of the acid circulation pipeline is communicated with the acid tank.

[0017] In some embodiments, a breathing valve is arranged on the finished product tank to ensure the pressure stability inside the finished product tank.

[0018] In some embodiments, the material of the continuous reactor is a corrosion-resistant non-metallic material, tantalum material or Hastelloy.

[0019] Through the above technical solution, a preparation system for europium trichloride hexahydrate provided by the utility model sets a stirring tank in the feeding system, and reacts the europium oxide slurry prepared by the stirring tank with hydrochloric acid. Compared with the method of directly putting solid europium oxide into hydrochloric acid solution, the intensity of the reaction is effectively reduced. At the same time, a continuous reactor is set in the reaction system. The continuous reactor is provided with a reaction channel and a cooling channel, so that it has extremely high heat transfer efficiency, specific surface area and homogenization effect, can take heat in time, and avoids the generation of sudden boiling phenomenon. Moreover, the continuous reactor can realize the continuous production of europium trichloride hexahydrate, and greatly improves the production efficiency compared with the intermittent production method of the existing beaker or stirring kettle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 is a schematic diagram of a preparation system for europium trichloride hexahydrate disclosed in an embodiment of the present utility model;

[0022] Figure 2 is a working principle diagram of an embodiment of the reactor of the preparation system for europium trichloride hexahydrate disclosed in an embodiment of the present utility model;

[0023] Figure 3 is a structural schematic diagram of an embodiment of the reactor for preparing europium trichloride hexahydrate disclosed in an embodiment of the present utility model.

[0024] DESCRIPTION OF THE REFERENCE NUMERALS

[0025] 1. Stirring tank; 2. Acid tank; 3. Continuous reactor; 4. Product tank; 5. Circulation pump; 6. Control valve; 7. Check valve; 8. Hydrochloric acid flowmeter; 9. Total flowmeter; 10. Breather valve; 11. Europium oxide powder conveying channel; 12. Purified water conveying channel; 13. Reaction plate; 14. Heat exchange plate; 15. Acid circulation pipeline; 16. Pressure controller; 17. Process air conveying pipeline; 18. Stirring member; 19. Purified water flowmeter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will further describe in detail the embodiments of the present utility model in conjunction with the drawings and embodiments. The following detailed description and drawings are used to exemplarily illustrate the principle of the present utility model, but cannot be used to limit the scope of the present utility model. The present utility model can be implemented in many different forms, not limited to the specific embodiments disclosed in the text, but including all technical solutions falling within the scope of the claims.

[0027] These embodiments of the present utility model are provided to make the present utility model thorough and complete, and to fully convey the scope of the present utility model to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the compositions of materials, numerical expressions and values set forth in these embodiments should be construed as merely exemplary, rather than as limitations.

[0028] It should be noted that in the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is greater than or equal to two; the orientation or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present utility model. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0029] In addition, the "first", "second" and similar terms used in the present utility model do not denote any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Terms such as "comprising" or "including" mean that the elements before this term cover the elements listed after this term, and do not exclude the possibility of also covering other elements.

[0030] It should also be noted that in the description of the present utility model, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. When it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0031] All terms used in the present utility model have the same meanings as those understood by those of ordinary skill in the art to which the present utility model pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as those, should be construed as having meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0032] Known technologies, methods, and equipment for those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be regarded as part of the specification.

[0033] To solve the problems that the preparation reaction of europium trichloride hexahydrate in the prior art is violent, easy to produce bumping phenomenon during the reaction, and there are potential safety hazards, the utility model provides a preparation system for europium trichloride hexahydrate, including: a feeding system, a reaction system arranged downstream of the feeding system, and a collection system arranged downstream of the reaction system. The feeding system includes a stirring tank 1 and an acid tank 2 with connected outlets. The reaction system includes a continuous reactor 3, and the collection system includes a finished product tank 4. Among them, the inlet of the stirring tank 1 is connected with a europium oxide powder conveying channel 11 and a purified water conveying channel 12 to prepare a europium oxide slurry. A reaction channel and a cooling channel are arranged in the continuous reactor 3, and the heat at the reaction channel can be absorbed by the cooling channel.

[0034] Among them, as Figure 1 shown, the feeding system is used to convey the raw material europium oxide slurry and hydrochloric acid required for preparing europium trichloride hexahydrate to the reaction system.

[0035] The europium oxide slurry can be prepared by the stirring tank 1. Specifically, two inlets can be opened on the stirring tank 1 and connected with the europium oxide powder conveying channel 11 and the purified water conveying channel 12 respectively. The europium oxide powder conveying channel 11 is used to convey solid europium oxide powder to the stirring tank 1, and the purified water conveying channel 12 is used to convey purified water to the stirring tank 1. The europium oxide powder and the purified water are stirred and mixed in the stirring tank 1 to form a europium oxide slurry. Compared with solid europium oxide powder, the europium oxide in slurry state can effectively reduce the intensity of the reaction when reacting with hydrochloric acid.

[0036] Hydrochloric acid can be stored in the acid tank 2. An inlet can be opened on the acid tank 2 and connected with a hydrochloric acid conveying channel for conveying hydrochloric acid to the acid tank 2. Control valves 6 can be arranged on the europium oxide powder conveying channel 11, the purified water conveying channel 12, and the hydrochloric acid conveying channel to respectively control the opening and closing of each channel and adjust the flow rate. A purified water flowmeter 19 can also be arranged on the purified water conveying channel 12 to monitor the purified water flow rate in real time.

[0037] The reaction system is used to receive the europium oxide slurry and hydrochloric acid conveyed from the feeding system and realize the reaction between the europium oxide slurry and hydrochloric acid.

[0038] Specifically, the inlet of the continuous reactor 3 can be connected with a feeding pipe, and the feeding pipe can be simultaneously communicated with the outlets of the stirring tank 1 and the acid tank 2 to receive and preliminarily mix the europium oxide slurry and hydrochloric acid. It should be noted that the heat generated by the preliminary reaction of the europium oxide slurry and hydrochloric acid in the feeding pipe is relatively low, the reaction is not violent, and the bumping phenomenon will not occur. The europium oxide slurry and hydrochloric acid can enter the continuous reactor 3 by means of blower transportation or pump transportation.

[0039] The reaction between europium oxide slurry and hydrochloric acid can be carried out in the continuous reactor 3. The continuous reactor 3 is provided with a reaction channel and a cooling channel. The heat at the reaction channel can be absorbed by the cooling channel, enabling it to have extremely high heat transfer efficiency, specific surface area, and homogenization effect, being able to extract heat in a timely manner, making the temperature near constant everywhere in the reaction channel, and fundamentally avoiding the occurrence of sudden boiling phenomenon.

[0040] The reaction system can also include a cooling water delivery channel, which is connected to the inlet of the cooling channel in the continuous reactor 3, and is used to supply cooling water to the reaction system to absorb the heat generated by the reaction between europium oxide slurry and hydrochloric acid. The cooling water delivery channel can preferably be designed as a cooling water circulation pipeline to recycle the cooling water and reduce production costs.

[0041] The collection system is used to receive the finished product europium trichloride hexahydrate solution prepared by the feeding system. Specifically, the finished product europium trichloride hexahydrate solution is collected by the finished product tank 4. The inlet of the finished product tank 4 can be communicated with the outlet of the reaction channel of the continuous reactor 3. A control valve 6 can also be provided at the outlet of the finished product tank 4 to control the opening and closing of the outlet end of the finished product tank 4 and the flow rate of the output finished product europium trichloride hexahydrate solution.

[0042] In the europium trichloride hexahydrate preparation system provided by the present utility model, a stirring tank 1 is arranged in the feeding system, and the europium oxide slurry prepared by the stirring tank 1 reacts with hydrochloric acid. Compared with the method of directly putting solid europium oxide into hydrochloric acid solution, the intensity of the reaction is effectively reduced; at the same time, a continuous reactor 3 is arranged in the reaction system. The continuous reactor 3 is provided with a reaction channel and a cooling channel, enabling it to have extremely high heat transfer efficiency, specific surface area, and homogenization effect, being able to extract heat in a timely manner, and avoiding the occurrence of sudden boiling phenomenon. Moreover, the continuous reactor 3 can realize the continuous production of europium trichloride hexahydrate, greatly improving the production efficiency compared with the existing batch production methods using beakers or stirring kettles.

[0043] In some embodiments, the stirring tank 1 includes a stirring member 18, and the stirring member 18 is a turbine stirrer or a paddle stirrer. As Figure 1 shown, the stirring tank 1 includes a stirring member 18 located at the central axis and penetrating from the top. The stirring member 18 can be a turbine stirrer or a paddle stirrer, enabling the europium oxide powder to be fully mixed with pure water, and avoiding the reaction of the powder in a solid state with hydrochloric acid after sedimentation. The stirring member 18 is preferably a turbine stirrer, and the turbine stirrer can keep the materials with fine particle size and large density (such as europium oxide powder) in a pulping and eddy state, with better mixing effect.

[0044] In some embodiments, the continuous reactor 3 is a microchannel reactor, including a reaction plate 13 and a heat exchange plate 14 arranged opposite to each other. The reaction plate 13 is provided with a reaction channel, and the heat exchange plate 14 is provided with a cooling channel.

[0045] Specifically, as Figures 1-3 shown, the feed pipe at the inlet of the continuous reactor 3 can be connected to the inlet of the reaction channel in the reaction plate 13. The flow direction of the europium oxide slurry and hydrochloric acid in the reaction channel is the same as the flow direction of the cooling water in the cooling channel, so that heat can be removed from the reaction in a timely manner and the heat removal effect is better. The heat exchange plate 14 can be arranged on either side of the reaction plate 13, or one heat exchange plate 14 can be arranged on each side of the reaction plate 13. The heat exchange plate 14 and the reaction plate 13 are close to each other but not in contact. During actual production, the heat exchange plate 14 and the reaction plate 13 can be arranged horizontally or vertically at intervals. The reaction channels in the reaction plate 13 can be arranged in a single layer, or arranged in a double layer to meet a larger production volume of europium trichloride hexahydrate. When the reaction channels are in a double layer, the inlets of the double-layer reaction channels can both be connected to the feed pipe of the continuous reactor 3. Similarly, the outlets of the double-layer reaction channels can both be connected to the discharge pipe of the continuous reactor 3.

[0046] In some embodiments, the reaction channels are formed in the reaction plate 13 as continuous and bent multiple segments along a direction parallel to the length or width of the reaction plate 13.

[0047] As Figure 3 shown, the reaction channels can be arranged as continuous and bent multiple segments along a direction parallel to the length or width of the reaction plate 13. Specifically, the reaction channels can be arranged as multiple parallel channels along the length or width of the reaction plate 13. In the direction from the inlet to the outlet of the reaction plate 13, the outlet of the previous segment of the adjacent two segments of channels is connected to the inlet of the next segment of the channel, finally forming continuous and bent multiple segments of channels. Such a method effectively prolongs the heat exchange time between the reactants and the coolant, and further improves the heat transfer efficiency of the continuous reactor 3.

[0048] In addition, in a microchannel reactor, according to different reaction systems, different shaped partition blocks (such as umbrella-shaped, heart-shaped, linear, O-shaped, mixed-shaped, etc.) can be further designed in the reaction channels, so that multiple reactants are continuously split and then merged in the reaction channels, realizing full mixing, mass transfer and reaction. As Figure 3 shown, the partition block in the reaction channel of the reaction plate 13 for preparing europium trichloride hexahydrate is preferably a heart-shaped partition block.

[0049] In some embodiments, the diameter of the reaction channels is set to be greater than or equal to 1.5 millimeters.

[0050] The multi-stage channel structure in the reaction plate 13 will increase the pressure drop of the continuous reactor 3, and there is a risk of channel blockage. Therefore, the europium oxide powder needs to be ground in advance. The average particle size of the ground powder is preferably less than or equal to 10 microns, and the maximum particle size is less than or equal to 50 microns. At the same time, the diameter of the reaction channel is set to be greater than or equal to 1.5 mm, and the medium flow rate is not less than 1 m / s to avoid blockage of the reaction channel by the reactants, so that the continuous reactor 3 can continuously and stably output the finished product europium trichloride hexahydrate solution, realizing the continuity of the preparation process. In actual production, it has been statistically found that the europium trichloride hexahydrate preparation system of the present utility model can prepare 0.5 tons of the finished product europium trichloride hexahydrate solution every day, which greatly improves the output compared with the previous method of preparing 80 liters of the finished product europium trichloride hexahydrate solution using a beaker every day.

[0051] In some embodiments, the spacing range between the reaction plate 13 and the heat exchange plate 14 is set to be 3 to 5 mm. As Figure 2 shown, a certain gap needs to be maintained between the reaction plate 13 and the heat exchange plate 14. A smaller gap makes the distance between the reaction plate 13 and the heat exchange plate 14 shorter, thereby increasing the heat transfer surface area, but at the same time it will also increase the pressure drop in the reaction channel. Therefore, the spacing range between the reaction plate 13 and the heat exchange plate 14 is preferably set to be 3 to 5 mm.

[0052] In some embodiments, the continuous reactor 3 is a tubular reactor, including a reaction tube and a jacket tube sleeved outside the reaction tube. A reaction channel is provided in the reaction tube, and a cooling channel is provided in the jacket tube.

[0053] In some specific embodiments, the reaction tube of the tubular reactor is a long tube structure, which can be connected to the feed tube at the inlet of the continuous reactor 3, and the inlet of the jacket tube can be connected to the cooling water delivery channel. The tubular reactor has a large heat exchange surface, high production capacity per unit volume, high volumetric efficiency, and good heat transfer effect and production continuity.

[0054] In some embodiments, the continuous reactor 3 is a tubular reactor, including a reaction tube and a coil tube sleeved outside the reaction tube. A reaction channel is provided in the reaction tube, and a cooling channel is provided in the coil tube.

[0055] In some specific embodiments, the reaction tube of the tubular reactor is a long tube structure, which can be connected to the feed tube at the inlet of the continuous reactor 3, and the inlet of the coil tube can be connected to the cooling water delivery channel. The tubular reactor has a large heat exchange surface, high production capacity per unit volume, high volumetric efficiency, and good heat transfer effect and production continuity.

[0056] In some embodiments, the number of continuous reactors 3 is one or more. The number of continuous reactors 3 can be selected as one or more according to production requirements. Multiple continuous reactors 3 can be connected in series or in parallel. Specifically, multiple continuous reactors 3 can be connected in series in sequence, or can be simultaneously connected to a main pipeline in the reaction system. When multiple continuous reactors 3 are connected in parallel, control valves can be provided at the inlet of each continuous reactor 3 and on the main pipeline between two adjacent continuous reactors 3, so that the number of continuous reactors 3 participating in reaction heat exchange during each production process can be increased or decreased according to actual needs, improving flexibility.

[0057] In some embodiments, the feed system further includes a process air conveying pipeline 17. A pressure controller 16 and a control valve 6 are provided on the process air conveying channel 17. The process air conveying pipeline 17 is connected to the inlet of the mixing tank 1 to ensure the pressure stability inside the mixing tank 1, and the process air conveying pipeline 17 is connected to the inlet of the acid tank 2 to ensure the pressure stability inside the acid tank 2.

[0058] As Figure 1 shown, both the mixing tank 1 and the acid tank 2 are pressure vessels, and it is necessary to ensure the pressure stability inside the device. Therefore, a process air conveying pipeline 17 needs to be provided in the feed system. Specifically, the process air conveying pipeline 17 can include a main pipeline and two branch pipelines connected to the main pipeline. An opening can be made at the inlet of the mixing tank 1 to connect to one branch pipeline of the process air conveying pipeline 17, and an opening can be made at the inlet of the acid tank 2 to connect to the other branch pipeline of the process air conveying pipeline 17. A pressure controller 16 and a control valve 6 can be provided on the main pipeline of the process air conveying pipeline 17 to monitor and regulate the total conveying volume of the process air entering the feed system, and control valves 6 can be provided on the two branch pipelines to regulate the conveying volume of the process air entering the mixing tank 1 and the acid tank 2.

[0059] In some embodiments, a control valve 6 is provided at the outlet of the mixing tank 1, a control valve 6 and a hydrochloric acid flowmeter 8 are provided at the outlet of the acid tank 2, and a total flowmeter 9 is provided at the inlet of the continuous reactor 3 to regulate the flow rates of the europium oxide slurry and hydrochloric acid entering the continuous reactor 3.

[0060] As Figure 1 shown, the hydrochloric acid flowmeter 8 is used to measure the flow rate of hydrochloric acid entering the continuous reactor 3 from the acid tank 2, and the total flowmeter 9 is used to measure the total flow rate of the europium oxide slurry and hydrochloric acid entering the continuous reactor 3. From this, the flow rate of the europium oxide slurry entering the continuous reactor 3 can be further calculated. By providing control valves 6 at the outlet of the mixing tank 1, the outlet of the acid tank 2, and the inlet of the continuous reactor 3, the flow rates of the europium oxide slurry and hydrochloric acid entering the continuous reactor 3 can be adjusted in a timely manner, so that the ratio of the europium oxide slurry and hydrochloric acid is maintained within a suitable range, and then precise temperature control of the reaction process can be achieved.

[0061] In some embodiments, the collection system further includes an acid circulation pipeline 15, in which a circulation pump 5 is provided. The first end of the acid circulation pipeline 15 communicates with the finished product tank 4, and the second end of the acid circulation pipeline 15 communicates with the acid tank 2.

[0062] As Figure 1 shown, during actual production, there will still be a situation where some hydrochloric acid does not fully react with the europium oxide slurry. This part of the hydrochloric acid will be transported from the continuous reactor 3 to the finished product tank 4 along with the finished product europium trichloride hexahydrate solution. Therefore, to ensure the full utilization of hydrochloric acid, an acid circulation pipeline 15 is added to the collection system. The europium trichloride hexahydrate solution containing hydrochloric acid enters the acid tank 2 again and is introduced into the continuous reactor 3 for the reaction of hydrochloric acid with the europium oxide slurry until all the hydrochloric acid in the finished product tank 4 has reacted.

[0063] In some embodiments, a breathing valve 10 is provided on the finished product tank 4 to ensure the stability of the pressure inside the finished product tank 4. The breathing valve 10 can not only isolate the internal space of the finished product tank 4 from the atmosphere within a certain pressure range, but also open to communicate with the atmosphere when the pressure exceeds or is lower than this pressure range, ensuring the stability of the pressure inside the finished product tank 4.

[0064] In some embodiments, the continuous reactor 3 is made of a corrosion-resistant non-metallic material or tantalum or Hastelloy.

[0065] So far, the embodiments of the present invention have been described in detail. To avoid obscuring the concept of the present invention, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed here based on the above description.

[0066] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be equivalently replaced without departing from the scope and spirit of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A system for preparing europium trichloride hexahydrate, characterized in that: include: A feeding system, a reaction system arranged downstream of the feeding system, and a collection system arranged downstream of the reaction system, wherein the feeding system comprises a stirring tank (1) and an acid tank (2) whose outlets are connected, the reaction system comprises a continuous reactor (3), and the collection system comprises a finished product tank (4), wherein the inlet of the stirring tank (1) is connected to a europium oxide powder conveying channel (11) and a clean water conveying channel (12) to prepare europium oxide slurry, and the continuous reactor (3) is provided with a reaction channel and a cooling channel, and the heat at the reaction channel can be absorbed by the cooling channel.

2. The system for preparing europium trichloride hexahydrate according to claim 1, characterized in that: The stirring tank (1) comprises a stirring member (18), wherein the stirring member (18) is a turbine stirrer or a paddle stirrer.

3. The system for preparing europium trichloride hexahydrate according to claim 1, characterized in that: The continuous reactor (3) is a microchannel reactor, comprising a reaction plate (13) and a heat exchange plate (14) arranged opposite to each other, the reaction plate (13) being provided with the reaction channel, and the heat exchange plate (14) being provided with the cooling channel.

4. The system for preparing europium trichloride hexahydrate according to claim 3, characterized in that: The reaction channel is formed in the reaction plate (13) as a plurality of continuous and bent sections along a length or width direction parallel to the reaction plate (13).

5. The system for preparing europium trichloride hexahydrate according to claim 4, characterized in that: The diameter of the reaction channel is set to be greater than or equal to 1.5 mm.

6. The system for preparing europium trichloride hexahydrate according to claim 3, characterized in that: The interval between the reaction plate (13) and the heat exchange plate (14) is set to range from 3 to 5 millimeters.

7. The system for preparing europium trichloride hexahydrate according to claim 1, characterized in that: The continuous reactor (3) is a tubular reactor, comprising a reaction tube and a jacket tube sleeved outside the reaction tube, the reaction tube being provided with the reaction channel, and the jacket tube being provided with the cooling channel.

8. The system for preparing europium trichloride hexahydrate according to claim 1, characterized in that: The continuous reactor (3) is a tubular reactor, comprising a reaction tube and a coiled tube sleeved outside the reaction tube, the reaction tube being provided with the reaction channel, and the coiled tube being provided with the cooling channel.

9. The system for preparing europium trichloride hexahydrate according to claim 1, characterized in that: The number of the continuous reactor (3) is one or more.

10. The system for preparing europium trichloride hexahydrate according to claim 1, characterized in that: The feeding system further comprises a process air delivery pipeline (17), on which a pressure controller (16) and a control valve (6) are arranged. The process air delivery pipeline (17) is connected to the inlet of the stirring tank (1) to ensure that the pressure inside the stirring tank (1) is stable. The process air delivery pipeline (17) is connected to the inlet of the acid tank (2) to ensure that the pressure inside the acid tank (2) is stable.

11. The system for preparing europium trichloride hexahydrate according to claim 1, characterized in that: A control valve (6) is provided at the outlet of the stirring tank (1), the control valve (6) and a hydrochloric acid flowmeter (8) are provided at the outlet of the acid tank (2), and a total flowmeter (9) is provided at the inlet of the continuous reactor (3) to adjust the flow of europium oxide slurry and hydrochloric acid entering the continuous reactor (3).

12. The system for preparing europium trichloride hexahydrate according to claim 1, characterized in that: The collection system further comprises an acid circulation pipeline (15), wherein a circulation pump (5) is arranged in the acid circulation pipeline (15), a first end of the acid circulation pipeline (15) is connected to the finished product tank (4), and a second end of the acid circulation pipeline (15) is connected to the acid tank (2).

13. The system for preparing europium trichloride hexahydrate according to claim 1, characterized in that: The finished product tank (4) is provided with a breathing valve (10) to ensure that the pressure inside the finished product tank (4) is stable.

14. The system for preparing europium trichloride hexahydrate according to claim 1, characterized in that: The material of the continuous reactor (3) is a corrosion-resistant non-metallic material or a tantalum material or a Hastelloy alloy.

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