A phosphorus recovery device

Abstract

This utility model relates to the technical field of phosphorus recovery equipment and discloses a phosphorus recovery device, including a small electric arc furnace with a connection box on the left side wall of the small electric arc furnace. This phosphorus recovery device uses a float-linkage control system of an automatic water injection component. When the water level in the connection box drops, the float drops synchronously with the liquid level, causing the extension rod and the pressing block to move downwards. When the water level is at the lowest point of the device's operation, the pressing block engages with the pressing energizer switch, triggering the energizer switch. The water pump automatically starts and injects water into the connection box through the water injection pipe. When the water level rises to a set height, the float pushes the pressing block against the pressing energizer switch, stopping the water pump from injecting water. This achieves fully automatic closed-loop control of the condensate. This design completely eliminates the lag of traditional manual water injection, avoids the risk of condensation interruption due to water level fluctuations, and further improves the practicality of the device.

Description

Technical Field

[0001] This utility model relates to the technical field of phosphorus recovery equipment, specifically a phosphorus recovery device. Background Technology

[0002] Indium phosphide is a core material for the preparation of high-frequency and high-speed semiconductor devices, and is widely used in optical communication, microwave devices and infrared detectors. In the polycrystalline synthesis process, phosphorus, as a key raw material, often participates in the reaction in elemental form. However, it has a low boiling point (about 280°C for white phosphorus) and is chemically active, making it easy to volatilize or form by-products at high temperatures, resulting in a raw material utilization rate of less than 70%. If unreacted phosphorus resources are not effectively recovered, it will not only increase production costs, but may also cause safety hazards and environmental pollution due to phosphorus vapor leakage. Therefore, it is necessary to use phosphorus recovery equipment.

[0003] However, existing phosphorus recovery devices mostly use static heating, resulting in uneven mixing of waste and reducing agent, leading to low phosphide decomposition efficiency. Some elemental phosphorus adheres to the furnace wall due to local overheating and sintering, causing resource waste. Furthermore, the critical water cooling process relies on manual operation, which can easily lead to safety issues due to untimely water injection. Therefore, a phosphorus recovery device is proposed to solve the above-mentioned technical problems. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a phosphorus recovery device that has advantages such as uniform mixing of waste materials and reducing agents and automatic water injection. It solves the problems of existing phosphorus recovery devices that mostly use static heating, resulting in uneven mixing of waste materials and reducing agents, leading to low phosphide decomposition efficiency, and some elemental phosphorus adhering to the furnace wall due to local overheating and sintering, causing resource waste. Furthermore, the water cooling process relies on manual operation, which can easily lead to safety issues due to untimely water injection.

[0006] (II) Technical Solution

[0007] To achieve the above-mentioned purpose of uniformly mixing waste materials and reducing agents and automatically injecting water, this utility model provides the following technical solution: a phosphorus recovery device, including a small electric arc furnace, a connecting box provided on the left side wall of the small electric arc furnace, a partition plate provided on the inner wall of the connecting box, a stirring assembly provided on the right side wall of the small electric arc furnace with one end extending into its interior and rotatably connected to the left side of its inner wall, a connecting pipe provided on the top of the small electric arc furnace with one end extending into the interior of the connecting box, an annular heat exchange pipe provided on the end of the connecting pipe away from the small electric arc furnace with one end extending to the bottom of the partition plate, an automatic water injection assembly provided on the top of the connecting box with one end extending into its interior, and an exhaust fan provided on the left side wall of the connecting box, with an exhaust pipe provided on the air inlet end of the exhaust fan with one end extending into the interior of the connecting box and located below the partition plate;

[0008] The stirring assembly includes a motor fixing frame. The motor fixing frame is provided on the right side wall of the small electric arc furnace. A servo motor is provided on the right side of the inner wall of the motor fixing frame. A stirring shaft is provided at the output shaft of the servo motor, with one end extending into the interior of the small electric arc furnace and rotatably connected to the left side of its inner wall.

[0009] The automatic water injection assembly includes a mounting plate. The mounting plate is located on the top of the connecting box. A crimp-off switch is located on the front side wall of the mounting plate. A crimp-on switch is located below the crimp-off switch on the front side wall of the mounting plate. An extension rod is located on the top of the crimp-on switch, with one end extending into the interior of the connecting box. A crimping block is located on the top of the extension rod, which fits tightly against the bottom of the crimp-off switch. A float ball is located at the bottom of the extension rod. A water pump is located on the right side of the mounting plate on the top of the connecting box. A water injection pipe is located at the outlet end of the water pump, with one end extending into the interior of the connecting box. The water inlet end of the water pump is located outside the connecting box.

[0010] Preferably, the outer surface of the stirring shaft is fixedly connected with stirring blades arranged in a spiral shape. The stirring blades are made of high-temperature resistant ceramic, and the distance between the stirring blades and the inner wall of the small electric arc furnace is 5-10 mm.

[0011] Preferably, the top of the small electric arc furnace is fixedly connected to a material injection pipe with one end extending into it, and the top of the material injection pipe is provided with a sealing cap.

[0012] Preferably, the rear side wall of the motor fixing frame is provided with a maintenance box door, and the exterior of the maintenance box door has a number of heat dissipation mesh holes.

[0013] Preferably, the inner wall of the connecting box is connected to a drain pipe extending to its rear side at one end, the drain pipe being located above the partition plate, and the inner wall of the connecting box is connected to a discharge pipe extending to its rear side at one end, the discharge pipe being located below the partition plate, and valves are fixedly connected to the outside of both the drain pipe and the discharge pipe.

[0014] Preferably, both the crimp-off switch and the crimp-on switch are micro-limit switches, and the control circuit of the water pump is electrically connected to the crimp-off switch and the crimp-on switch respectively.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, the present invention provides a phosphorus recovery device, which has the following beneficial effects:

[0017] 1. This phosphorus recovery device, by setting up a stirring assembly, uses a servo motor to drive spirally distributed high-temperature resistant ceramic stirring blades to perform high-frequency uniform stirring of indium phosphide waste and reducing agents (such as coke) in a small electric arc furnace. This effectively increases the heating area of ​​the material and significantly improves the reaction rate compared to traditional static heating. The safe distance design between the stirring blades and the furnace wall avoids mechanical friction damage to the furnace body and ensures that the material in dead corners is fully turned over, significantly reducing the waste of elemental phosphorus due to local overheating. This effectively improves the material utilization rate and enhances the practicality of the device.

[0018] 2. This phosphorus recovery device utilizes a float-linked control system in its automatic water injection assembly. When the water level in the connection box drops, the float descends synchronously with the liquid level, causing the extension rod and the pressing block to move downwards. When the water level reaches the lowest point of the device's operation, the pressing block engages with the pressing energizer switch, triggering the switch and automatically starting the water pump to inject water into the connection box through the injection pipe. When the water level rises to the set height, the float pushes the pressing block against the pressing energizer switch, stopping the water pump from injecting water. This achieves fully automatic closed-loop control of the condensate. This design completely eliminates the lag inherent in traditional manual water injection, avoids the risk of condensation interruption due to water level fluctuations, and further improves the device's practicality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This utility model Figure 1 Enlarged diagram of point A in the middle.

[0021] In the diagram: 1. Small electric arc furnace; 2. Connecting box; 3. Stirring assembly; 31. Motor fixing frame; 32. Servo motor; 33. Stirring shaft; 4. Divider plate; 5. Connecting pipe; 6. Annular heat exchanger tube; 7. Automatic water injection assembly; 71. Mounting plate; 72. Crimp power off switch; 73. Crimp power on switch; 74. Extension rod; 75. Crimping block; 76. Float ball; 77. Water pump; 78. Water injection pipe; 8. Exhaust fan; 9. Exhaust pipe. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-2 A phosphorus recovery device includes a small electric arc furnace 1. A feeding pipe extending into the furnace is fixedly connected to the top of the small electric arc furnace 1, and a sealing cap is provided at the top of the feeding pipe. A connecting box 2 is fixedly connected to the left side wall of the small electric arc furnace 1, and a partition plate 4 is fixedly connected to the inner wall of the connecting box 2. A stirring assembly 3 extending into the furnace and rotatably connected to the left side of the furnace's inner wall is movably connected to the right side wall of the small electric arc furnace 1. The stirring assembly 3 includes a motor mounting frame 31. The rear side wall of the motor mounting frame 31 is provided with a maintenance box door. The exterior of the maintenance box door has a number of heat dissipation mesh holes. A servo motor 32 is fixedly connected to the right side of the inner wall of the motor mounting frame 31. A stirring shaft 33 is fixedly connected to the output shaft of the servo motor 32, with one end extending into the interior of the small electric arc furnace 1 and rotatably connected to the left side of its inner wall. Spiral stirring blades are fixedly connected to the outer surface of the stirring shaft 33. The stirring blades are made of high-temperature resistant ceramic, and the distance between the stirring blades and the inner wall of the small electric arc furnace 1 is 5-10mm.

[0024] A connecting pipe 5 extending into the interior of a connecting box 2 is fixedly connected to the top of a small electric arc furnace 1. A solenoid valve is fixedly connected to the outside of the connecting pipe 5. An annular heat exchange pipe 6 extending to the bottom of a partition plate 4 is fixedly connected to the end of the connecting pipe 5 away from the small electric arc furnace 1. An automatic water injection assembly 7 extending into the top of the connecting box 2 is movably connected to the top. The automatic water injection assembly 7 includes a mounting plate 71. The mounting plate 71 is fixedly connected to the top of the connecting box 2. A crimp-on switch 72 is fixedly connected to the front side wall of the mounting plate 71. A crimp-off switch 73 located below the crimp-on switch 72 is fixedly connected to the front side wall of the mounting plate 71. The crimp-on switch 72... Both the press-on switch 73 and the press-off switch 74 are micro-limit switches, and the control circuit of the water pump 77 is electrically connected to the press-off switch 72 and the press-on switch 73 respectively. The top of the press-on switch 73 is movably connected to an extension rod 74 that extends into the inside of the connecting box 2. The top of the extension rod 74 is fixedly connected to a press block 75 that fits tightly against the bottom of the press-off switch 72. The bottom of the extension rod 74 is fixedly connected to a float ball 76. The top of the connecting box 2 is fixedly connected to a water pump 77 located on the right side of the mounting plate 71. The outlet end of the water pump 77 is fixedly connected to a water injection pipe 78 that extends into the inside of the connecting box 2. The inlet end of the water pump 77 is located outside the connecting box 2.

[0025] A blower 8 is fixedly connected to the left side wall of the connecting box 2. An exhaust pipe 9 is fixedly connected to the air inlet end of the blower 8, extending into the interior of the connecting box 2 and located below the partition plate 4. A metal filter screen with a mesh size of 0.1-0.3mm is provided at the air inlet end of the exhaust pipe 9. A drain pipe extending to the rear side of the inner wall of the connecting box 2 is connected to the drain pipe, which is located above the partition plate 4. A discharge pipe extending to the rear side of the inner wall of the connecting box 2 is connected to the discharge pipe, which is located below the partition plate 4. Valves are fixedly connected to the outside of both the drain pipe and the discharge pipe.

[0026] In use, indium phosphide waste crushed to a particle size ≤5mm is first mixed with coke at a mass ratio of 1:0.5~1:1, and then added to a small electric arc furnace 1 through a feeding pipe. The servo motor 32 is started to drive the spiral high-temperature resistant ceramic stirring blades to stir the material at a speed of 80-120 r / min. Simultaneously, the electric arc furnace is heated to 1400-1600℃, causing the InP waste and coke to undergo a high-temperature reduction reaction to generate phosphorus vapor. The phosphorus vapor enters the annular heat exchange tube 6 in the connecting box 2 through the connecting pipe 5. During this process, the automatic water injection component 7 in the connecting box... Ball 76 is linked to control the water pump, realizing the automatic closed-loop injection of condensate, which cools and condenses phosphorus vapor into liquid phosphorus. The condensed liquid phosphorus falls into the bottom of the connecting box 2 and flows into the liquid collection tank through the discharge pipe. The cooling water can be recycled or discharged. At the same time, the exhaust fan 8 extracts the tail gas and connects it to the waste gas treatment system. After the reaction is completed, the equipment can be easily maintained and circulated, thus forming a closed loop of "heating decomposition - condensation recovery - safe treatment" to achieve efficient recovery of phosphorus. At the same time, the staff can clean the inside of the small electric arc furnace 1 through the injection pipe.

[0027] It is worth noting that the small electric arc furnace 1, servo motor 32, and exhaust fan 8 mentioned in this application are all externally connected to a drive power supply and a control switch, and the water pump 77 is also externally connected to a drive power supply. Furthermore, the small electric arc furnace 1, servo motor 32, water pump 77, and exhaust fan 8 are all conventional and known equipment. The standard parts used in this application can all be purchased from the market. The specific connection methods of each part are all connected using conventional methods such as bolts, rivets, and welding that are mature in the prior art. Moreover, the machinery, parts, and equipment all use conventional models in the prior art. In addition, the circuit connection uses conventional connection methods in the prior art. The contents not described in detail in the description belong to the prior art known to those skilled in the art, and will not be described in detail here.

[0028] In summary, this phosphorus recovery device, through the installation of a stirring assembly 3, with a servo motor 32 driving spirally distributed high-temperature resistant ceramic stirring blades, can perform high-frequency uniform stirring of indium phosphide waste and reducing agents (such as coke) in a small electric arc furnace 1. This effectively increases the heated area of ​​the material, and the reaction rate is significantly improved compared to traditional static heating. The safe distance design between the stirring blades and the furnace wall avoids mechanical friction damage to the furnace body and ensures that materials in dead corners are fully agitated, significantly reducing phosphorus sintering waste caused by local overheating. This effectively improves material utilization and enhances the practicality of the device. Through the linkage control system of the float 76 of the automatic water injection assembly 7, when the water level in the connecting box 2 drops, the float 76 descends synchronously with the liquid level, driving the extension rod 74 and the pressing block 75 to move down. When the water level is at the lowest point of equipment operation... At this time, the pressing block 75 is in contact with the pressing switch 73, triggering the pressing switch 73. The water pump 77 automatically starts and injects water into the connection box 2 through the water injection pipe 78. When the water level rises to the set height, the float ball 76 pushes the pressing block 75 to press against the pressing switch 72, and the water pump 77 stops injecting water, realizing fully automatic closed-loop control of condensate. This design completely eliminates the lag of traditional manual water injection, avoids the risk of condensation interruption caused by water level fluctuations, further improves the practicality of the device, and solves the problem that existing phosphorus recovery devices mostly use static heating, resulting in uneven mixing of waste and reducing agent, leading to low phosphide decomposition efficiency. Some elemental phosphorus is sintered and adheres to the furnace wall due to local overheating, causing resource waste. Secondly, the key link of water cooling relies on manual operation, which is prone to safety problems caused by untimely water injection.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for phosphorus recovery comprising a small-scale electric arc furnace (1), characterized in that: The small electric arc furnace (1) has a connecting box (2) on its left side wall, a partition plate (4) on its inner wall, a stirring assembly (3) extending into its interior and rotatably connected to its inner wall on its right side wall, a connecting pipe (5) extending into the connecting box (2) on its top, an annular heat exchange pipe (6) extending into the bottom of the partition plate (4) on the end of the connecting pipe (5) away from the small electric arc furnace (1), an automatic water injection assembly (7) extending into its interior on its top, an exhaust fan (8) on the left side wall of the connecting box (2), and an exhaust pipe (9) extending into the connecting box (2) and located below the partition plate (4) on the air inlet end of the exhaust fan (8). The stirring assembly (3) includes a motor fixing frame (31). The right side wall of the small electric arc furnace (1) is provided with a motor fixing frame (31). The right side of the inner wall of the motor fixing frame (31) is provided with a servo motor (32). The output shaft of the servo motor (32) is provided with a stirring shaft (33) that extends into the interior of the small electric arc furnace (1) and is rotatably connected to the left side of its inner wall. The automatic water injection assembly (7) includes an installation plate (71). The top of the connection box (2) is provided with the installation plate (71). The front side wall of the installation plate (71) is provided with a crimping power-off switch (72). The front side wall of the installation plate (71) is provided with a crimping power-on switch (73) located below the crimping power-off switch (72). The top of the crimping power-on switch (73) is provided with an extension rod (74) extending into the connection box (2). The top of the extension rod (74) is provided with a crimping block (75) that fits tightly against the bottom of the crimping power-off switch (72). The bottom of the extension rod (74) is provided with a float ball (76). The top of the connection box (2) is provided with a water pump (77) located to the right of the installation plate (71). The outlet end of the water pump (77) is provided with a water injection pipe (78) extending into the connection box (2). The inlet end of the water pump (77) is located outside the connection box (2).

2. A device for phosphorus recovery according to claim 1, characterized in that: The outer surface of the stirring shaft (33) is fixedly connected with stirring blades arranged in a spiral shape. The stirring blades are made of high-temperature resistant ceramic, and the distance between the stirring blades and the inner wall of the small electric arc furnace (1) is 5-10 mm.

3. The apparatus for phosphorus recovery according to claim 1, characterized in that: The top of the small electric arc furnace (1) is fixedly connected to a material injection pipe with one end extending into it, and a sealing cap is provided on the top of the material injection pipe.

4. The phosphorus recovery apparatus according to claim 1, characterized in that: The rear side wall of the motor fixing frame (31) is provided with a maintenance box door, and the exterior of the maintenance box door is provided with a number of heat dissipation mesh holes.

5. The phosphorus recovery apparatus according to claim 1, characterized in that: The inner wall of the connecting box (2) is connected to a drain pipe extending to its rear side. The drain pipe is located above the partition plate (4). The inner wall of the connecting box (2) is connected to a discharge pipe extending to its rear side. The discharge pipe is located below the partition plate (4). Valves are fixedly connected to the outside of both the drain pipe and the discharge pipe.

6. The phosphorus recovery apparatus according to claim 1, characterized in that: Both the crimp-off switch (72) and the crimp-on switch (73) are micro-limit switches, and the control circuit of the water pump (77) is electrically connected to the crimp-off switch (72) and the crimp-on switch (73) respectively.

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