Preparation equipment of anhydrous lanthanum bromide

By using a preparation device that accelerates gas mixing and solid-liquid separation, the problems of long mixing time and low separation efficiency in the preparation of anhydrous lanthanum bromide have been solved, achieving efficient preparation and simplified operation, and improving the user experience and durability of the device.

CN223774814UActive Publication Date: 2026-01-09BAOTOU MING XIN TECH CO LTD
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Patent Information

Application Number
CN202520134122.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-01-21
Publication Date
2026-01-09
Estimated Expiration
2035-01-21

AI Technical Summary

Technical Problem

Traditional anhydrous lanthanum bromide preparation methods suffer from low raw material mixing efficiency, limited gas diffusion rate, and long mixing time, which affect product quality and production efficiency. Furthermore, the low solid-liquid separation efficiency and easy clogging of filter pores increase operational difficulty and cost.

Method used

The preparation equipment includes a fixed base, clamping rod, vacuum roasting flask, fixed bed reactor, partition and filter plate. Gas mixing is accelerated through gas supply pipe and gas inlet pipe, and the filter plate is cleared by a rotating rod and a dial driven by a servo motor to achieve rapid solid-liquid separation.

Benefits of technology

It improves gas mixing efficiency, simplifies operation steps, enhances device convenience, increases solid-liquid separation efficiency, shortens preparation time, reduces manual labor intensity, and extends device lifespan.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of rare earth material preparation, and discloses anhydrous lanthanum bromide preparation equipment, which comprises a fixed bottom table, a first fixed plate, a second fixed plate, a third fixed plate and a fourth fixed plate, the fixed bottom table is fixedly placed on a table top, the outer wall of one side of the fixed bottom table is fixedly provided with the first fixed plate, and the top of the first fixed plate is provided with a driving structure; the clamping rod is fixedly mounted at the top of the fixed bottom table, and a vacuum roasting bottle is mounted in the clamping rod in a clamping manner; the preparation structure comprises a preparation part and a screening part, the preparation part comprises a first preparation tank arranged at the top of the fixed bottom table, a fixed bed reactor is fixedly mounted in the first preparation tank, and a third cover plate is fixedly mounted at the top of the first preparation tank, so that the purposes of adding raw material gas and accelerating mixing are achieved; the mixed gas is purified, so that the preparation efficiency of the rare earth catalyst is improved, the use convenience of the device is improved, the gas is quickly mixed, and the operation steps of the device are simplified.
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Description

Technical Field

[0001] This utility model belongs to the field of rare earth material preparation technology, specifically, it relates to a preparation device for anhydrous lanthanum bromide. Background Technology

[0002] Anhydrous lanthanum bromide, as a high-performance rare earth compound, demonstrates indispensable value in numerous high-tech fields. In catalysis, its unique chemical properties make anhydrous lanthanum bromide a highly efficient catalyst for various chemical reactions, significantly improving reaction rates and selectivity while reducing energy consumption and byproduct formation, thus promoting the development of green chemistry and fine chemicals. In the field of scintillation crystals, anhydrous lanthanum bromide, due to its excellent optical properties and scintillation characteristics, is widely used in high-energy physics, nuclear medicine imaging, and safety detection, providing strong support for scientific research and technological applications.

[0003] However, in the traditional preparation of anhydrous lanthanum bromide, the mixing efficiency between the gaseous and solid feedstocks is one of the key factors affecting product quality and production efficiency. Due to the limited gas diffusion rate during mixing, coupled with the non-uniformity of gas flow distribution within the reactor, mixing time is often prolonged, thus extending the entire preparation cycle. This not only increases production costs but may also affect the uniformity and purity of the product.

[0004] Furthermore, the solid-liquid mixture generated during the preparation process presents challenges in subsequent processing. To obtain high-purity anhydrous lanthanum bromide, solid-liquid separation of the reaction products is typically required. However, traditional sieving or filtration methods are prone to pore clogging when handling mixtures containing small particles or sticky substances, leading to low separation efficiency and even affecting the final product quality. This not only increases operational difficulty and labor costs but may also damage equipment and reduce its lifespan.

[0005] In view of this, this utility model is proposed. Utility Model Content

[0006] To solve the aforementioned technical problem of slow raw material mixing rate, the basic concept of the technical solution adopted by this utility model is as follows:

[0007] An apparatus for preparing anhydrous lanthanum bromide, comprising:

[0008] A fixed base is fixedly placed on a table surface. A first fixed plate is fixedly installed on one outer wall of the fixed base, and a driving structure is provided on the top of the first fixed plate.

[0009] The clamping rod is fixedly installed on the top of the fixed base, and a vacuum roasting flask is clamped inside the clamping rod;

[0010] The preparation structure comprises a preparation part and a screening part, the preparation part comprises a first preparation tank arranged on the top of the fixed base, a fixed bed reactor is fixedly arranged in the first preparation tank, a third cover plate is fixedly arranged on the top of the first preparation tank, and the screening part comprises a second preparation tank arranged on the top of the fixed base, a partition plate is fixedly arranged in the second preparation tank, and a filter plate is clampedly arranged in the partition plate.

[0011] The fixed ring plates are fixedly arranged on the outer walls of one side of the fixed base, the number of the fixed ring plates is two groups, and the inner walls of the two groups of fixed ring plates are fixedly connected with the outer walls of the first preparation tank and the second preparation tank.

[0012] As a preferred embodiment of the utility model, the preparation part further comprises a gas conveying pipe fixedly arranged at the bottom of the first preparation tank, a hole is formed in the outer wall of one side of the first preparation tank, an exhaust valve is fixedly arranged in the hole, two groups of connecting rods are fixedly arranged at the bottom of the third cover plate, and a first annular gas conveying plate is fixedly arranged at the bottom of the connecting rod.

[0013] As a preferred embodiment of the utility model, the preparation part further comprises a second annular gas conveying plate rotatably arranged at the bottom of the third cover plate, four groups of second gas conveying openings are fixedly arranged at the bottom of the first annular gas conveying plate, four groups of first gas conveying openings are fixedly arranged at the bottom of the second annular gas conveying plate, a first gas inlet pipe is fixedly arranged at the top of the first annular gas conveying plate, one end of the first gas inlet pipe extends to the top of the third cover plate, a second gas inlet pipe is fixedly arranged at the top of the second annular gas conveying plate, and one end of the second gas inlet pipe extends to the top of the third cover plate.

[0014] As a preferred embodiment of the utility model, the screening part further comprises a discharge pipe fixedly arranged at the bottom of the second preparation tank, a first cover plate is fixedly arranged at the top of the second preparation tank, a second cover plate is clampedly arranged in the first cover plate, a first rotating rod is rotatably arranged in the first cover plate, a push plate is fixedly arranged at the bottom of the first rotating rod, the bottom of the push plate is tightly attached to the top of the filter plate, and the first rotating rod is sleeved and arranged in the partition plate.

[0015] As a preferred embodiment of the utility model, the driving structure further comprises a servo motor fixedly arranged at the top of the first fixed plate, a rotating shaft is rotatably arranged at the bottom of the first fixed plate, a second rotating rod is fixedly arranged at one end of the rotating shaft, one end of the second rotating rod is fixedly connected with the top of the first annular gas conveying plate, and the output shaft of the servo motor is fixedly connected with the other end of the rotating shaft through a shaft coupling.

[0016] As a preferred embodiment of the utility model, the driving structure further comprises another group of second rotating rods fixedly arranged at one end of the first rotating rod, belt pulleys are fixedly arranged on the outer walls of the two groups of second rotating rods, and a transmission belt is sleeved and arranged between the two groups of belt pulleys.

[0017] As a preferred embodiment of the utility model, a group of drawstrings are fixedly installed on the top of the second cover plate and the filter plate, a gas leakage valve is clamped and installed on the top of the vacuum roasting bottle, a transfusion tube is fixedly installed on the outer wall of the vacuum roasting bottle, one end of the transfusion tube is fixedly connected with the inside of the second preparation tank, and one end of the gas conveying tube extends to the inside of the vacuum roasting bottle.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1. The purpose of adding and accelerating mixing of raw gas is achieved, the mixed gas is purified, the preparation efficiency of rare earth catalytic material is improved, the convenience of device use is improved, the gas is quickly mixed, and the device operation steps are simplified.

[0020] 2. The purpose of dredging the solid-liquid separation device is achieved, the solid-liquid separation efficiency of the device is improved, the preparation efficiency of rare earth catalytic material is improved, the preparation time of the device is shortened, and the use experience of the device is optimized.

[0021] 3. The purpose of driving the device is achieved, the preparation material is conveyed, the efficiency of manual preparation is improved, the work pressure of manual work is reduced, the device is convenient to use, and the durability of the device is improved.

[0022] The specific embodiments of the utility model will be described in further detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] In the drawings:

[0024] Figure 1 It is the front view of the utility model;

[0025] Figure 2 It is the structure schematic view of the utility model;

[0026] Figure 3 It is the second rotating rod structure schematic view of the utility model;

[0027] Figure 4 It is the second preparation tank split view of the utility model;

[0028] Figure 5 It is the third cover plate structure schematic view of the utility model;

[0029] Figure 6 It is the second annular gas conveying plate structure schematic view of the utility model;

[0030] Figure 7 It is the first preparation tank structure schematic view of the utility model.

[0031] In the figure: 10, fixed base; 11, clamping rod; 12, vacuum roasting bottle; 13, air release valve; 14, infusion tube; 15, first preparation tank; 16, fixed bed reactor; 17, exhaust valve; 18, gas conveying pipe; 19, second preparation tank; 20, fixed ring plate; 21, first cover plate; 22, second cover plate; 23, discharge pipe; 24, first rotating rod; 25, push plate; 26, partition plate; 27, filter plate; 28, second rotating rod; 29, pulley; 30, transmission belt; 31, third cover plate; 32, connecting rod; 33, first annular gas conveying plate; 34, second annular gas conveying plate; 35, first gas inlet; 36, second gas inlet; 37, first gas inlet pipe; 38, second gas inlet pipe; 39, first fixed plate; 40, servo motor; 41, rotating shaft. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model.

[0033] Embodiment one: a preparation device of anhydrous lanthanum bromide, specifically as shown in Figure 1 , Figure 3 and Figure 4 , comprising a fixed base 10, the fixed base 10 is fixedly placed on a table top, a first fixed plate 39 is fixedly installed on one side of the outer wall of the fixed base 10, and a driving structure is arranged on the top of the first fixed plate 39; a clamping rod 11 is fixedly installed on the top of the fixed base 10, and a vacuum roasting bottle 12 is clamped and installed in the clamping rod 11; a preparation structure, the preparation structure comprises a preparation part and a screening part, the preparation part comprises a first preparation tank 15 arranged on the top of the fixed base 10, a fixed bed reactor 16 is fixedly installed in the first preparation tank 15, a third cover plate 31 is fixedly installed on the top of the first preparation tank 15, and the screening part comprises a second preparation tank 19 arranged on the top of the fixed base 10, a partition plate 26 is fixedly installed in the second preparation tank 19, and a filter plate 27 is detachably installed in the partition plate 26; a fixed ring plate 20 is fixedly installed on one side of the outer wall of the fixed base 10, the number of the fixed ring plate 20 is two groups, and the inner walls of the two groups of fixed ring plates 20 are fixedly connected with the outer walls of the first preparation tank 15 and the second preparation tank 19 respectively. The preparation rate of raw materials is accelerated through the preparation structure.

[0034] Specifically as shown in Figure 1 , Figure 3 , Figure 6 and Figure 7As shown, the preparation part further comprises a gas conveying pipe 18 fixedly installed at the bottom of the first preparation tank 15, a hole is formed on the outer wall of one side of the first preparation tank 15, and an exhaust valve 17 is fixedly installed in the hole, two groups of connecting rods 32 are fixedly installed at the bottom of the third cover plate 31, and a first annular gas conveying plate 33 is fixedly installed at the bottom of the connecting rod 32. The fixed bed reactor 16 is fixed by the first preparation tank 15, the raw material is purified by the fixed bed reactor 16, and the purified mixed gas is conveyed to the inside of the vacuum flask 12 by the gas conveying pipe 18, and the exhaust valve 17 is used to output the waste gas and waste material.

[0035] Specifically as Figure 1 、 Figure 3 、 Figure 5 、 Figure 6 and Figure 7 As shown, the preparation part further comprises a second annular gas conveying plate 34 rotatably installed at the bottom of the third cover plate 31, four groups of second gas inlets 36 are fixedly installed at the bottom of the first annular gas conveying plate 33, four groups of first gas inlets 35 are fixedly installed at the bottom of the second annular gas conveying plate 34, a first gas inlet pipe 37 is fixedly installed at the top of the first annular gas conveying plate 33, one end of the first gas inlet pipe 37 extends to the top of the third cover plate 31, a second gas inlet pipe 38 is fixedly installed at the top of the second annular gas conveying plate 34, and one end of the second gas inlet pipe 38 extends to the top of the third cover plate 31. The raw material gas is conveyed to the inside of the first preparation tank 15 through the first gas inlet pipe 37 and the second gas inlet pipe 38, the gas output by the first gas inlet 35 and the second gas inlet 36 is stirred and mixed when the first annular gas conveying plate 33 rotates in the first preparation tank 15, the gas flow speed is accelerated, and the gas mixing efficiency is improved.

[0036] According to the above, through the structures of the first preparation tank 15, the fixed bed reactor 16, the exhaust valve 17, the gas conveying pipe 18, the third cover plate 31, the connecting rod 32, the first annular gas conveying plate 33, the second annular gas conveying plate 34, the first gas inlet 35, the second gas inlet 36, the first gas inlet pipe 37 and the second gas inlet pipe 38, the purpose of adding and accelerating the mixing of the raw material gas is achieved, the mixed gas is purified, the preparation efficiency of the rare earth catalyst is improved, the convenience of using the device is improved, the gas is quickly mixed, and the operation steps of the device are simplified.

[0037] Example Two: Based on example one, specifically as Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the screening part further comprises a discharge pipe 23 fixedly installed at the bottom of the second preparation tank 19, the top of the second preparation tank 19 is fixedly installed with a first cover plate 21, the inside of the first cover plate 21 is clampedly installed with a second cover plate 22, the inside of the first cover plate 21 is rotatably installed with a first rotating rod 24, the bottom of the first rotating rod 24 is fixedly installed with a push plate 25, the bottom of the push plate 25 is tightly attached to the top of a filter plate 27, and the first rotating rod 24 is sleevedly installed in the inside of a partition plate 26. The collected distillate is delivered to the top of the partition plate 26 through the second preparation tank 19, and the distillate is subjected to solid-liquid separation through the filter plate 27. When the first rotating rod 24 rotates, the push plate 25 is driven to rotate, the particles blocking the holes of the filter plate 27 are pushed, and the solid-liquid separation efficiency is improved.

[0038] According to the above, through the structures of the second preparation tank 19, the first cover plate 21, the second cover plate 22, the discharge pipe 23, the first rotating rod 24, the push plate 25, the partition plate 26 and the filter plate 27, the purpose of dredging the solid-liquid separation device is achieved, the solid-liquid separation efficiency is improved, the preparation efficiency of the rare earth catalyst is improved, the preparation time of the device is shortened, and the use experience of the device is optimized.

[0039] Example Three: Based on examples one and two, as shown in Figure 1 , Figure 2 and Figure 3 , the driving structure further comprises a servo motor 40 fixedly installed at the top of the first fixed plate 39, the bottom of the first fixed plate 39 is rotatably installed with a rotating shaft 41, one end of the rotating shaft 41 is fixedly installed with a second rotating rod 28, one end of the second rotating rod 28 is fixedly connected with the top of the first annular gas conveying plate 33, and the output shaft of the servo motor 40 is fixedly connected with the other end of the rotating shaft 41 through a shaft coupling. The servo motor 40 is started to drive the rotating shaft 41 to rotate.

[0040] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 6 , the driving structure further comprises another group of second rotating rods 28 fixedly installed at one end of the first rotating rod 24, a belt pulley 29 is fixedly installed on the outer wall of the two groups of second rotating rods 28, and a transmission belt 30 is sleevedly installed between the two groups of belt pulleys 29. The two groups of belt pulleys 29 are driven to move under the action of the transmission belt 30, and the first annular gas conveying plate 33 and the first rotating rod 24 are driven to rotate.

[0041] As shown in Figure 1 and Figure 2As shown, the top of the second cover plate 22 and the filter plate 27 are fixedly installed with a group of pull belts, the top of the vacuum flask 12 is clampedly installed with the air release valve 13, the outer wall of the vacuum flask 12 is fixedly installed with the liquid delivery pipe 14, one end of the liquid delivery pipe 14 is fixedly connected with the inside of the second preparation tank 19, and one end of the gas delivery pipe 18 extends to the inside of the vacuum flask 12. The vacuum flask 12 is depressurized through the air release valve 13, the mixed gas is delivered to the inside of the vacuum flask 12 through the gas delivery pipe 18, the distilled liquid is delivered to the inside of the second preparation tank 19 through the liquid delivery pipe 14, and the vacuum flask 12 can be heated through an external heating device to make the gas in the vacuum flask 12 perform distillation treatment.

[0042] In summary, through the structures of the fixed base 10, the clamping rod 11, the vacuum flask 12, the air release valve 13, the liquid delivery pipe 14, the first preparation tank 15, the gas delivery pipe 18, the second preparation tank 19, the first rotating rod 24, the second rotating rod 28, the belt pulley 29, the transmission belt 30, the first annular gas delivery plate 33, the first fixed plate 39, the servo motor 40 and the rotating shaft 41, the device can be driven, the preparation material can be delivered, the efficiency of manual preparation can be improved, the work pressure of manual work can be reduced, the device is convenient to use, and the durability of the device is improved.

[0043] Working principle: raw materials (such as lanthanum oxide La2O3) are placed in a vacuum roasting bottle 12 clamped by a clamping rod 11 on a fixed base 10, hydrogen bromide gas (HBr) is introduced into the first preparation tank 15 through the first gas inlet pipe 37 and the second gas inlet pipe 38, the servo motor 40 is started, the rotating shaft 41 is driven to rotate, and then the first annular gas distribution plate 33 and the second annular gas distribution plate 34 are driven to rotate in the first preparation tank 15 through the second rotating rod 28. The rotating motion makes the gas output from the first gas inlet 35 and the second gas inlet 36 to be efficiently stirred and mixed above the fixed bed reactor 16, accelerates the flow speed of the gas flow, and improves the mixing efficiency of the gas and the solid raw materials. In an argon atmosphere, lanthanum oxide reacts with hydrogen bromide gas in the fixed bed reactor 16 to generate lanthanum bromide. The reaction temperature is controlled by an external heating device, and is usually maintained at 500-700 DEG C. The reaction time is about 3-4 hours. The waste gas generated during the reaction is discharged from the system through the exhaust valve 17. The mixture (which may contain lanthanum bromide, ammonium bromide and unreacted substances) after the reaction is transported to the vacuum roasting bottle 12 through the gas pipe 18 for distillation treatment. The vacuum roasting bottle 12 can be heated by an external heating device to distill the gas in the interior. The distillate enters the second preparation tank 19 through the liquid inlet pipe 14. In the second preparation tank 19, the distillate is subjected to solid-liquid separation through the filter plate 27. In order to prevent the filter plate 27 from being blocked, the first rotating rod 24 is driven to rotate by the servo motor 40, and the rotating plate 25 is rotated, so that the particles blocking the filter holes are removed and the solid-liquid separation efficiency is improved. The solid product (such as high-purity anhydrous lanthanum bromide) after separation is collected from the discharge pipe 23, and after dehydration and purification, the anhydrous lanthanum bromide is ready for the preparation of rare earth catalyst materials or other applications.

[0044] It can be understood that the utility model is described through some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the utility model. In addition, under the guidance of the utility model, these features and embodiments can be modified to adapt to specific conditions and materials without departing from the spirit and scope of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope protected by the utility model.

Claims

1. An apparatus for preparing anhydrous lanthanum bromide, characterized in that, include: A fixed base (10) is fixedly placed on a table surface. A first fixed plate (39) is fixedly installed on one side of the outer wall of the fixed base (10). A driving structure is provided on the top of the first fixed plate (39). Clamping rod (11) is fixedly installed on the top of the fixed base (10), and a vacuum roasting flask (12) is clamped inside the clamping rod (11); The preparation structure includes a preparation section and a sieving section. The preparation section includes a first preparation tank (15) located on the top of a fixed base (10). A fixed bed reactor (16) is fixedly installed inside the first preparation tank (15). A third cover plate (31) is fixedly installed on the top of the first preparation tank (15). The sieving section includes a second preparation tank (19) located on the top of a fixed base (10). A partition plate (26) is fixedly installed inside the second preparation tank (19). A filter plate (27) is snapped into the inside of the partition plate (26). Fixed ring plate (20) is fixedly installed on one side of the outer wall of the fixed base (10). There are two sets of fixed ring plates (20). The inner walls of the two sets of fixed ring plates (20) are fixedly connected to the outer walls of the first preparation tank (15) and the second preparation tank (19), respectively.

2. The apparatus for preparing anhydrous lanthanum bromide according to claim 1, characterized in that, The preparation unit also includes a gas supply pipe (18) fixedly installed at the bottom of the first preparation tank (15). A hole is opened on one side of the outer wall of the first preparation tank (15), and an exhaust valve (17) is fixedly installed in the hole. Two sets of connecting rods (32) are fixedly installed at the bottom of the third cover plate (31), and a first annular gas supply plate (33) is fixedly installed at the bottom of the connecting rods (32).

3. The apparatus for preparing anhydrous lanthanum bromide according to claim 1, characterized in that, The preparation unit also includes a second annular gas conveying plate (34) rotatably mounted on the bottom of the third cover plate (31). The bottom of the first annular gas conveying plate (33) is fixedly mounted with four sets of second gas inlets (36). The bottom of the second annular gas conveying plate (34) is fixedly mounted with four sets of first gas inlets (35). The top of the first annular gas conveying plate (33) is fixedly mounted with a first air inlet pipe (37). One end of the first air inlet pipe (37) extends to the top of the third cover plate (31). The top of the second annular gas conveying plate (34) is fixedly mounted with a second air inlet pipe (38). One end of the second air inlet pipe (38) extends to the top of the third cover plate (31).

4. The apparatus for preparing anhydrous lanthanum bromide according to claim 1, characterized in that, The screening section also includes a discharge pipe (23) fixedly installed at the bottom of the second preparation tank (19). A first cover plate (21) is fixedly installed on the top of the second preparation tank (19). A second cover plate (22) is snapped into the inside of the first cover plate (21). A first rotating rod (24) is rotatably installed inside the first cover plate (21). A lever plate (25) is fixedly installed at the bottom of the first rotating rod (24). The bottom of the lever plate (25) is in close contact with the top of the filter plate (27). The first rotating rod (24) is sleeved and installed inside the partition plate (26).

5. The apparatus for preparing anhydrous lanthanum bromide according to claim 1, characterized in that, The drive structure also includes a servo motor (40) fixedly installed on the top of the first fixed plate (39). A rotating shaft (41) is rotatably installed on the bottom of the first fixed plate (39). A second rotating rod (28) is fixedly installed on one end of the rotating shaft (41). One end of the second rotating rod (28) is fixedly connected to the top of the first annular air conveying plate (33). The output shaft of the servo motor (40) is fixedly connected to the other end of the rotating shaft (41) through a coupling.

6. The apparatus for preparing anhydrous lanthanum bromide according to claim 1, characterized in that, The drive structure also includes another set of second rotating rods (28) fixedly installed at one end of the first rotating rod (24). Pulleys (29) are fixedly installed on the outer walls of the two sets of second rotating rods (28), and a transmission belt (30) is sleeved between the two sets of pulleys (29).

7. The apparatus for preparing anhydrous lanthanum bromide according to claim 4, characterized in that, A set of pull straps is fixedly installed on the top of the second cover plate (22) and the filter plate (27). A vent valve (13) is snapped onto the top of the vacuum roasting flask (12). An infusion tube (14) is fixedly installed on the outer wall of the vacuum roasting flask (12). One end of the infusion tube (14) is fixedly connected to the inside of the second preparation tank (19). One end of the gas infusion tube (18) extends into the inside of the vacuum roasting flask (12).