Stirring and firing system for aluminum phosphide production

Abstract

The utility model relates to a stirring and firing system for aluminum phosphide production, and belongs to the technical field of aluminum phosphide production. Comprising a furnace body arranged in a foundation pit and a powder mixing machine arranged above the ground, electric heaters are evenly arranged on the inner wall of the furnace body, a feeding port and a discharging port are formed in the powder mixing machine, a ground rail is arranged below the discharging port, and an electric self-walking rail car walking in the length direction of the ground rail is arranged on the ground rail. A firing inner container is further arranged in the furnace body, and the furnace further comprises a lifting device used for lifting the firing inner container. The utility model has the beneficial effects that raw materials for producing aluminum phosphide are mixed by utilizing the powder mixer, then the fired liner is transferred to the hoisting position by utilizing the electric self-walking rail car and is transferred into the furnace body by utilizing the hoisting device, and after the firing is finished, the fired liner is transferred into the furnace body by utilizing the hoisting device. The firing inner container in the furnace body and the reactants in the firing inner container can be transferred to the next working procedure through the lifting device, the connection of the previous working procedure and the next working procedure is smooth, and therefore the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a stirring and calcining system for aluminum phosphide production, belonging to the field of aluminum phosphide production technology. Background Technology

[0002] Industrially, aluminum phosphide tablets or granules are commonly produced by calcining red phosphorus and aluminum powder at high temperatures. This method is simple to operate and relatively inexpensive, and is often used in the production of fumigant insecticides. Typical reaction conditions involve high-temperature calcination, and the product contains approximately 56% aluminum phosphide.

[0003] A utility model patent with patent number 202122886088.X discloses a reactor for aluminum phosphide production, comprising a base, a reaction tank, a connecting tank, and a lid. Two uprights are symmetrically arranged on the base. The connecting tank has an overall annular structure and fits snugly around the outside of the reaction tank, with the reaction tank and connecting tank rotatably connected. The lid is fitted onto the upper side of the reaction tank. A reversing shaft is provided on the inner side of each upright, and the reversing shaft is fixedly connected to the connecting tank. An annular drive belt is provided at the bottom of the reaction tank, and drive rollers are provided on the sides of the uprights, with the drive rollers cooperating with the drive belt. Both the reversing shaft and the drive rollers are driven by motors, and the motors are electrically connected to a controller. This utility model can achieve stirring and mixing of raw materials, and the reversing shaft enables the reaction tank to be flipped, facilitating the pouring out of raw materials and effectively improving the efficiency of raw material mixing.

[0004] While the aforementioned patent can achieve the function of mixing raw materials, the current technology is not comprehensive and has the following drawbacks: 1. In the existing aluminum phosphide production process, mixing and firing need to be separated into two steps. Due to the limitations of the process flow and equipment, the connection between the two processes is not smooth, which leads to a decrease in production efficiency. 2. Due to uneven heating, some of the mixed powder inside the firing tank may fail to form aluminum phosphide, resulting in defective products and further increasing production costs.

[0005] To solve one of the above problems, there is an urgent need for a stirring and calcining system for aluminum phosphide production. Utility Model Content

[0006] Based on the shortcomings of the existing technology, the technical problem to be solved by this utility model is: how to achieve smooth connection between the preceding and following processes, thereby increasing production efficiency. To this end, a stirring and calcining system for aluminum phosphide production is provided.

[0007] The present invention relates to a stirring and calcining system for aluminum phosphide production, comprising a furnace body disposed in a foundation pit and a powder mixer disposed above ground. Electric heaters are uniformly arranged on the inner wall of the furnace body. The powder mixer has an inlet and an outlet, a ground track below the outlet, an electric self-propelled railcar traveling along its length on the ground track, a stabilizing frame mounted on the electric self-propelled railcar, a calcining liner disposed within the furnace body, and a lifting device for hoisting the calcining liner.

[0008] This application utilizes a lifting device to hoist the firing liner onto an electric self-propelled railcar and open the tank cover. The stabilizing frame on the electric self-propelled railcar ensures stability during the movement of the firing liner, preventing tilting. The electric self-propelled railcar then transfers the firing liner to a position below a powder mixer, where the raw materials for producing aluminum phosphide are mixed. The mixed raw materials are discharged into the firing liner through the outlet. After the reaction materials are filled, the tank cover is closed. The electric self-propelled railcar then transfers the firing liner to a hoisting position, and the lifting device transfers it into the furnace. The furnace cover is then closed, and the electric heater is turned on. The raw materials inside the firing liner are fired through the furnace. After firing is complete, the furnace cover is opened, and the lifting device allows the firing liner and its reactants to be transferred to the next process. The firing liner is then disassembled to obtain aluminum phosphide.

[0009] Preferably, the firing liner has a split structure, including an upper tank and a lower tank. A connecting flange A is provided on the outer wall of the bottom of the upper tank, and a connecting flange B is provided on the outer wall of the top of the lower tank. The connecting flange A and the connecting flange B are connected by connecting bolts. A tank lifting lug is provided on the outer wall of the upper part of the upper tank. A tank cover is fastened to the top opening of the upper tank, and the bottom of the lower tank is sealed by the tank bottom.

[0010] The upper and lower tanks can be disassembled by setting connecting flange A, connecting flange B, and connecting bolts, making it easy to remove the finished aluminum phosphide product from the firing liner. The tank lifting lugs facilitate the hoisting of the firing liner, and the tank cover allows for easier opening and closing of the top opening of the upper tank.

[0011] Preferably, the powder mixer is a three-dimensional mixer. Driven by the drive shaft, the loading cylinder undergoes repeated translational rotation and tumbling movements, causing the material to move in three directions—circumferential, radial, and axial—along the cylinder. This achieves the mutual flow, diffusion, accumulation, and mixing of various materials, resulting in uniform mixing and excellent mixing performance.

[0012] Preferably, the lifting device includes a suspension rail and a suspended electric monorail trolley that travels along the length of the suspension rail. An electric hoist is mounted on the suspended electric monorail trolley, and a lifting frame is suspended from the lifting wire rope of the electric hoist. Two sets of hooks are installed at equal intervals on the lifting frame. The suspended electric monorail trolley can move along the length of the suspension rail, carrying the electric hoist. The electric hoist can control the raising and lowering of the lifting frame via the lifting wire rope. The hooks can cooperate with the furnace cover lifting lugs for lifting the furnace cover, or with the tank body lifting lugs for facilitating the lifting of the firing liner.

[0013] Preferably, a furnace cover is detachably installed on the top of the furnace body, and a furnace cover lifting lug is installed on the furnace cover.

[0014] Preferably, the furnace body is connected to an auxiliary cooling mechanism to achieve rapid cooling and facilitate subsequent operations.

[0015] Preferably, the auxiliary cooling mechanism includes an air supply duct, a return air duct, a plate heat exchanger, and a cooling tower. One end of the return air duct extends to the upper inner part of the furnace body, and the other end of the return air duct is connected to the heat medium inlet of the plate heat exchanger. One end of the air supply duct extends to the bottom inner part of the furnace body, and the other end of the air supply duct is connected to the heat medium outlet of the plate heat exchanger. The refrigerant outlet of the plate heat exchanger is connected to the inlet of the cooling tower through a first circulation pipe, and the refrigerant inlet of the plate heat exchanger is connected to the outlet of the cooling tower through a second circulation pipe to form a closed-loop circulating cooling water pipeline. A cooling circulation pump is installed on the first circulation pipe, and an exhaust fan is installed on the air supply duct. After the firing reaction of the inner liner is completed, the exhaust fan, cooling circulation pump and cooling tower are turned on. The high-temperature gas in the furnace enters the plate heat exchanger through the return air pipe, and then is discharged into the furnace through the plate heat exchanger and exhaust fan. The cooling tower, together with the cooling circulation pump, can continuously provide cooling water to the plate heat exchanger. The hot air in the furnace completes heat exchange in the plate heat exchanger, which can quickly cool down the firing inner liner in the furnace, making it easier to carry out the next step of operation.

[0016] Preferably, the cooling tower is a closed-loop cooling tower.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The stirring and calcining system for aluminum phosphide production described in this utility model uses a powder mixer to mix the raw materials used in aluminum phosphide production. Then, an electric self-propelled railcar is used to transfer the calcining liner to the hoisting position, and the hoisting device is used to transfer the calcining liner into the furnace. After calcination is completed, the hoisting device can be used to transfer the calcining liner and the reactants inside the calcining liner to the next process. The connection between the preceding and following processes is smooth, thereby increasing production efficiency.

[0019] The stirring and calcining system for aluminum phosphide production described in this utility model has electric heaters uniformly arranged on the inner wall of the furnace body to solve the problem that some mixed powders may fail to form aluminum phosphide due to uneven heating.

[0020] The stirring and calcining system for aluminum phosphide production described in this utility model includes a cooling tower and a cooling circulation pump that continuously provide cooling water to the plate heat exchanger. The hot air in the furnace body completes heat exchange in the plate heat exchanger, thereby rapidly cooling the calcining liner in the furnace body, facilitating the next step of the operation. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the internal structure of the fired inner liner of this utility model;

[0025] In the diagram: 1. Furnace body; 2. Electric heater; 3. Firing liner; 3.1. Upper tank; 3.2. Lower tank; 3.3. Connecting flange A; 3.4. Connecting flange B; 3.5. Connecting bolts; 3.6. Tank cover; 3.7. Tank lifting lugs; 3.8. Tank bottom; 4. Lifting rail; 5. Suspended electric monorail trolley; 6. Electric hoist; 7. Lifting wire rope; 8. Hanger; 9. Hook; 10. Powder mixer; 11. Feed inlet; 12. Discharge outlet; 13. Ground track; 14. Electric self-propelled railcar; 15. Stabilizing frame; 16. Furnace cover; 17. Furnace cover lifting lugs; 18. Air supply duct; 19. Return air duct; 20. Plate heat exchanger; 21. Cooling tower; 22. Cooling circulation pump; 23. Exhaust fan. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings: The present invention will be further described below through specific embodiments, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0027] Example 1, such as Figure 1As shown, the stirring and calcining system for aluminum phosphide production includes a furnace body 1 set in a pit and a powder mixer 10 set above the ground. Electric heaters 2 are uniformly arranged on the inner wall of the furnace body 1. The powder mixer 10 has a feed inlet 11 and a discharge outlet 12. A ground track 13 is located below the discharge outlet 12. An electric self-propelled railcar 14 that travels along the length of the ground track 13 is mounted on the ground track 13. A stabilizing frame 15 is installed on the electric self-propelled railcar 14. The furnace body 1 also includes a calcining liner 3 and a lifting device for hoisting the calcining liner 3.

[0028] This application utilizes a lifting device to hoist the fired inner liner 3 onto an electric self-propelled railcar 14 and opens the tank cover 3.6. The stabilizing frame 15 on the electric self-propelled railcar 14 can ensure the stability of the electric self-propelled railcar 14 when carrying the fired inner liner 3, and prevent tilting. Then, the electric self-propelled railcar 14 transfers the calcining inner liner 3 to the area below the powder mixer 10. The powder mixer 10 mixes the raw materials used to produce aluminum phosphide. The mixed raw materials are discharged into the calcining inner liner 3 through the discharge port 12. After the reaction raw materials are filled, the tank cover 3.6 is closed. Then, the electric self-propelled railcar 14 transfers the calcining inner liner 3 to the hoisting position, and the hoisting device is used to transfer the calcining inner liner 3 into the furnace body 1. The furnace cover 16 is then closed, and the electric heater 2 is turned on. The raw materials in the calcining inner liner 3 are calcined through the furnace body 1. After calcination is completed, the furnace cover 16 is opened, and the hoisting device can be used to transfer the calcining inner liner 3 and the reactants in the calcining inner liner 3 to the next process. The calcining inner liner 3 is then disassembled to obtain aluminum phosphide.

[0029] Example 2, as Figure 1 As shown, the stirring and calcining system for aluminum phosphide production includes a furnace body 1 set in a pit and a powder mixer 10 set above the ground. Electric heaters 2 are uniformly arranged on the inner wall of the furnace body 1. The powder mixer 10 has a feed inlet 11 and a discharge outlet 12. A ground track 13 is located below the discharge outlet 12. An electric self-propelled railcar 14 that travels along the length of the ground track 13 is mounted on the ground track 13. A stabilizing frame 15 is installed on the electric self-propelled railcar 14. The furnace body 1 also includes a calcining liner 3 and a lifting device for hoisting the calcining liner 3.

[0030] Furthermore, referring to Figure 3The inner liner 3 is a split structure, including an upper tank 3.1 and a lower tank 3.2. A connecting flange A3.3 is provided on the outer wall of the bottom of the upper tank 3.1, and a connecting flange B3.4 is provided on the outer wall of the top of the lower tank 3.2. The connecting flanges A3.3 and B3.4 are connected by connecting bolts 3.5. A tank lifting lug 3.7 is provided on the outer wall of the upper part of the upper tank 3.1. A tank cover 3.6 is fastened to the top opening of the upper tank 3.1, and the bottom of the lower tank 3.2 is sealed by a tank bottom 3.8.

[0031] The upper tank 3.1 and lower tank 3.2 can be disassembled by setting connecting flange A3.3, connecting flange B3.4, and connecting bolts 3.5, making it easy to remove the finished aluminum phosphide product from the firing inner liner 3. The tank lifting lugs 3.7 facilitate the hoisting of the firing inner liner 3, and the tank cover 3.6 makes it easier to open and close the top opening of the upper tank 3.1.

[0032] Furthermore, the powder mixer 10 is a three-dimensional mixer. Driven by the drive shaft, the loading cylinder performs a series of compound movements, including translation, rotation, and tumbling, which causes the material to move in three directions—circumferential, radial, and axial—along the cylinder. This enables the mutual flow, diffusion, accumulation, and mixing of various materials, achieving uniform mixing and obtaining excellent mixing results.

[0033] Furthermore, the lifting device includes a suspension rail 4 and a suspended electric monorail trolley 5 that travels along the length of the suspension rail 4. An electric hoist 6 is mounted on the suspended electric monorail trolley 5, and a lifting frame 8 is suspended from the lifting wire rope 7 of the electric hoist 6. Two sets of hooks 9 are installed at equal intervals on the lifting frame 8. The suspended electric monorail trolley 5 can move along the length of the suspension rail 4, carrying the electric hoist 6. The electric hoist 6 can control the lifting and lowering of the lifting frame 8 via the lifting wire rope 7. The hooks 9 can cooperate with the furnace cover lifting lug 17 for lifting the furnace cover 16, and can also cooperate with the tank body lifting lug 3.7 for facilitating the lifting of the firing inner liner 3.

[0034] Furthermore, a furnace cover 16 is detachably installed on the top of the furnace body 1, and a furnace cover lug 17 is installed on the furnace cover 16.

[0035] Example 3, as Figure 2 As shown, the difference from Embodiment 2 is that the furnace body 1 is externally connected to an auxiliary cooling mechanism. This achieves rapid cooling, facilitating the next step of the operation.

[0036] Furthermore, the auxiliary cooling mechanism includes an air supply duct 18, a return air duct 19, a plate heat exchanger 20, and a cooling tower 21. One end of the return air duct 19 extends to the upper inner part of the furnace body 1, and the other end of the return air duct 19 is connected to the heat medium inlet of the plate heat exchanger 20. One end of the air supply duct 18 extends to the bottom inner part of the furnace body 1, and the other end of the air supply duct 18 is connected to the heat medium outlet of the plate heat exchanger 20. The refrigerant outlet of the plate heat exchanger 20 is connected to the inlet of the cooling tower 21 through a first circulation pipe, and the refrigerant inlet of the plate heat exchanger 20 is connected to the outlet of the cooling tower 21 through a second circulation pipe to form a closed-loop circulating cooling water pipeline. A cooling circulation pump 22 is installed on the first circulation pipe, and an exhaust fan 23 is installed on the air supply duct 18.

[0037] The furnace body 1 has an inlet pipe (not shown) for introducing inert gas, which ensures the stable progress of the aluminum phosphide reaction.

[0038] After the firing of the inner liner 3 is completed, the exhaust fan 23, cooling circulation pump 22, and cooling tower 21 can be turned on. The high-temperature gas in the furnace body 1 enters the plate heat exchanger 20 through the return air pipe 19, and then is discharged into the furnace body 1 through the plate heat exchanger 20 and the exhaust fan 23. The cooling tower 21, together with the cooling circulation pump 22, can continuously provide cooling water to the plate heat exchanger 20. The hot air in the furnace body 1 completes heat exchange in the plate heat exchanger 20, which can quickly cool down the firing of the inner liner 3 in the furnace body 1, making it easier to carry out the next step of the operation.

[0039] Furthermore, the cooling tower 21 is a closed-loop cooling tower.

[0040] The stirring and calcining system for aluminum phosphide production described in this utility model uses a powder mixer to mix the raw materials used in aluminum phosphide production. Then, an electric self-propelled railcar is used to transfer the calcining liner to the hoisting position, and the hoisting device is used to transfer the calcining liner into the furnace. After calcination is completed, the hoisting device can be used to transfer the calcining liner and the reactants inside the calcining liner to the next process. The connection between the preceding and following processes is smooth, thereby increasing production efficiency.

[0041] The stirring and calcining system for aluminum phosphide production described in this utility model has electric heaters uniformly arranged on the inner wall of the furnace body to solve the problem that some mixed powders may fail to form aluminum phosphide due to uneven heating.

[0042] The stirring and calcining system for aluminum phosphide production described in this utility model includes a cooling tower and a cooling circulation pump that continuously provide cooling water to the plate heat exchanger. The hot air in the furnace body completes heat exchange in the plate heat exchanger, thereby rapidly cooling the calcining liner in the furnace body, facilitating the next step of the operation.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

[0044] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A stirring and calcining system for aluminum phosphide production, comprising a furnace body disposed in a pit and a powder mixer disposed above ground, wherein electric heaters are uniformly arranged on the inner wall of the furnace body, characterized in that: The powder mixer has a feed inlet and a discharge outlet. Below the discharge outlet is a ground track. An electric self-propelled railcar travels along the length of the ground track. A stabilizing frame is installed on the electric self-propelled railcar. The furnace body also contains a firing liner and a lifting device for hoisting the firing liner.

2. The stirred calcination system for aluminum phosphide production according to claim 1, characterized in that, The firing liner has a split structure, including an upper tank and a lower tank. A connecting flange A is provided on the outer wall of the bottom of the upper tank, and a connecting flange B is provided on the outer wall of the top of the lower tank. The connecting flange A and the connecting flange B are connected by connecting bolts. A tank lifting lug is provided on the outer wall of the upper part of the upper tank. A tank cover is fastened to the top opening of the upper tank, and the bottom of the lower tank is sealed by the tank bottom.

3. The stirred calcination system for aluminum phosphide production according to claim 1, characterized in that, The powder mixer is a three-dimensional mixer.

4. The stirred calcination system for aluminum phosphide production according to any one of claims 1-3, characterized in that, The lifting device includes a rail and a suspended electric monorail trolley that travels along the length of the rail. An electric hoist is installed on the suspended electric monorail trolley, and a lifting frame is suspended on the lifting wire rope of the electric hoist. Two sets of hooks are installed at equal intervals on the lifting frame.

5. The stirred calcination system for aluminum phosphide production according to claim 4, characterized in that, The furnace body is detachably fitted with a furnace cover on its top, and the furnace cover is fitted with furnace cover lugs.

6. The stirred calcination system for aluminum phosphide production according to claim 5, characterized in that, The furnace body is connected to an auxiliary cooling mechanism.

7. The stirred calcination system for aluminum phosphide production according to claim 6, characterized in that, The auxiliary cooling mechanism includes an air supply duct, a return air duct, a plate heat exchanger, and a cooling tower. One end of the return air duct extends to the upper inner part of the furnace body, and the other end of the return air duct is connected to the heat medium inlet of the plate heat exchanger. One end of the air supply duct extends to the bottom inner part of the furnace body, and the other end of the air supply duct is connected to the heat medium outlet of the plate heat exchanger. The refrigerant outlet of the plate heat exchanger is connected to the inlet of the cooling tower through a first circulation pipe, and the refrigerant inlet of the plate heat exchanger is connected to the outlet of the cooling tower through a second circulation pipe to form a closed-loop circulating cooling water pipeline. A cooling circulation pump is installed on the first circulation pipe, and an exhaust fan is installed on the air supply duct.

8. The stirred calcination system for aluminum phosphide production according to claim 7, characterized in that, The cooling tower is a closed-loop cooling tower.

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