Reaction kettle and method for preparing sodium nitrate by adopting reaction kettle

Abstract

The invention discloses a reaction kettle and a method for preparing sodium nitrate by adopting the reaction kettle, and relates to the technical field of reaction kettles.According to the scheme, a kettle body comprises an upper shell and a lower shell, a stirring mechanism is installed in the kettle body and used for stirring raw materials, a gas circulation mechanism is installed at the bottom of the kettle body, and the gas circulation mechanism is communicated with the upper shell and the lower shell. A stirring mechanism is arranged in the kettle body, a gas circulation mechanism is arranged in the kettle body and used for driving gas in the kettle body to flow, an adjusting mechanism is arranged in the kettle body, and the adjusting mechanism is used for adjusting the volume in the kettle body. In addition, part of the volatilized materials can be dissolved into the material solution again for continuous reaction, so that the materials can be wasted, and the subsequent tail gas treatment cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of reactors, in particular to a reactor and a method for preparing sodium nitrate by using the reactor. Background Art

[0002] Sodium nitrate is an important chemical raw material with wide applications in multiple industries. Currently, sodium nitrate is commonly produced industrially by neutralizing sodium hydroxide with nitric acid. In this production process, the reaction is usually carried out in a reactor.

[0003] However, existing production processes present several pressing challenges. Nitric acid is highly volatile, and during the reaction, some of it evaporates into the air, preventing it from being redissolved in the reaction solution for reuse. This not only wastes the nitric acid raw material and increases production costs, but the volatile nitric acid gas also requires specialized tail gas treatment, further increasing tail gas treatment costs. Furthermore, improper handling of the volatile nitric acid gas can easily pollute the environment.

[0004] On the other hand, during the reaction process, the reaction solution may stratify, and parameters such as solution concentration and temperature may vary between different layers. Single-layer stirring cannot effectively mix the solutions at different layers, resulting in insufficient reaction and affecting the production efficiency and product quality of sodium nitrate. For example, in the early stages of the reaction, the upper layer solution may have a higher nitric acid concentration, while the lower layer solution may have a higher sodium hydroxide concentration. If layered stirring is not performed, the neutralization reaction will be incomplete, resulting in the production of more by-products and reducing the purity of the sodium nitrate. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a reactor and a method for preparing sodium nitrate using the reactor, which solves the problems raised in the background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a reactor, comprising a reactor body, the reactor body comprising an upper shell and a lower shell, a stirring mechanism installed inside the reactor body, the stirring mechanism is used to stir the raw materials, a gas circulation mechanism is installed at the bottom of the reactor body, the gas circulation mechanism is used to drive the gas flow inside the reactor body, and an adjustment mechanism is installed inside the reactor body, the adjustment mechanism is used to adjust the pressure inside the reactor body.

[0007] Preferably, the stirring mechanism includes a driving assembly and a stirring assembly slidably sleeved on the outside of the driving assembly, the driving assembly is used to drive the stirring assembly to rotate, and the stirring assembly is used to stir the material in the kettle body, the driving assembly includes a motor installed on the top of the kettle body, the output shaft of the motor is fixedly connected to the main shaft, and the bottom end of the main shaft is fixedly connected to the spline shaft, and the rotation of the motor can drive the main shaft and the spline shaft to rotate.

[0008] The stirring assembly includes a spline sleeve slidingly sleeved on the outside of the spline shaft, two stirring rods are symmetrically installed on both sides of the bottom end of the spline sleeve, and multiple arc plates are installed on the outer surface of the stirring rod in sequence. The rotation of the spline shaft can drive the spline sleeve and the stirring rod installed on the spline sleeve to rotate, thereby stirring the material. The spline shaft and spline sleeve are arranged so that the stirring rod can move up and down while rotating.

[0009] A reset spring is fixedly connected between the top end of the spline sleeve and the bottom end of the main shaft. The bottom end of the main shaft is equipped with a protective cover which is a sliding sleeve arranged on the outside of the top end of the spline shaft. The reset spring is provided to facilitate the reset of the spline sleeve and the stirring, and the protective cover can wrap and protect the reset spring.

[0010] Preferably, the gas circulation mechanism includes a mounting plate installed at the bottom of the kettle body, an air intake shell and a gearbox are installed on one side of the mounting plate, the bottom end of the air intake shell is rotatably connected to a driven shaft fixedly connected to the output end of the gearbox, the top of the driven shaft is fixedly connected to a turbine fan blade, a connecting pipe is fixedly connected between one side of the bottom end of the air intake shell and one side of the kettle body, the top of the air intake shell is fixedly connected to an aeration pipe, the top of the aeration pipe is fixedly connected to a plurality of aeration nozzles, the aeration nozzles are fixedly installed inside the bottom end of the kettle body, and can extract the gas above the material and aerate it out through the aeration nozzles at the bottom, so that the volatilized material can re-enter the material solution, avoiding waste, and at the same time reducing the cost of subsequent exhaust gas treatment.

[0011] Preferably, the aeration nozzle is connected to the interior of the kettle body, and a one-way valve is installed inside the aeration nozzle. The aeration nozzle is located below the corresponding curved plate. The airflow burst out of the aeration nozzle can generate an upward thrust on the curved plate on the stirring body, thereby lifting the curved plate and the stirring rod. In conjunction with the reset spring, the material solution can be stirred up and down, thereby improving the stirring effect.

[0012] Preferably, an air outlet is provided on the top side of the lower shell, and an air inlet is provided on the bottom side of the air inlet shell. Both ends of the connecting pipe are fixedly connected to the air outlet and the air inlet respectively, so as to facilitate the flow of gas.

[0013] Preferably, the input end of the gearbox is fixedly connected to a driving shaft, the top end of the driving shaft is sealingly and rotatably connected to the bottom of the kettle body, and the top end of the driving shaft is fixedly connected to the bottom end of the spline shaft. When the motor drives the main shaft and the spline shaft to rotate, the driving shaft can be driven to rotate, and then the gearbox can be driven to operate, and the driven shaft installed on the output end of the gearbox can be driven to rotate faster, and then the turbine blades can be driven to rotate, driving the gas flow.

[0014] Preferably, the adjusting mechanism includes an adjusting plate that is slidably sleeved on the outside of the main shaft, and two first connecting members are symmetrically installed on both sides of the lower surface of the adjusting plate, the interior of the first connecting member is rotatably connected to a spring telescopic rod, the bottom end of the spring telescopic rod is rotatably connected to a second connecting member, and the second connecting member is fixedly connected to the inner wall of the kettle body by bolts. The adjusting plate connected by the sliding connection can move up when the pressure increases during the reaction in the kettle body, and can automatically adjust the reaction pressure in the kettle body, and can generate a certain pressure on the gas under the action of the spring telescopic rod, thereby increasing the driving force of the gas on the turbine blades, thereby reducing the load of the motor and increasing the service life of the motor, and since the second connecting member and the first connecting member are fixedly connected by bolts, the adjusting mechanism can be disassembled to achieve other uses, thereby improving practicality.

[0015] Preferably, the outer surface of the adjustment plate is fixedly connected to a first sealing ring that cooperates with the inner wall of the kettle body, and the inner wall of the adjustment plate is fixedly connected to a second sealing ring that cooperates with the outer wall of the main shaft. The adjustment plate and the second connecting part are both located inside the upper shell body. The first sealing ring can improve the sealing between the adjustment plate and the kettle body, and the second sealing ring can improve the sealing between the adjustment plate and the main shaft to avoid gas leakage.

[0016] Preferably, a plurality of first connecting pipes are sequentially installed on the top of the upper shell, a plurality of second connecting pipes are sequentially installed on the top side of the lower shell, and a feed pipe and a discharge pipe are respectively installed on the top and bottom sides of the lower shell. The first connecting pipe and the second connecting pipe are provided to facilitate the installation of the corresponding valve body and the detection equipment, and the feed pipe and the discharge pipe are provided to facilitate the addition and discharge of materials.

[0017] A method for preparing sodium nitrate comprises the following steps: S1. Install corresponding valve bodies and corresponding detection equipment on the second connecting pipe, the feed pipe and the discharge pipe, and then add the sodium hydroxide solution and nitric acid solution used to prepare sodium nitrate into the kettle body through the feed pipe in sequence; S2. Start the stirring mechanism to stir and mix the materials in the kettle; S3. The operation of the stirring mechanism can drive the operation of the gas circulation mechanism, which can extract the gas above the material and aerate it from the bottom of the material, so that the nitric acid volatilized in the gas can be re-dissolved into the material liquid, which can avoid waste and reduce the subsequent cost of tail gas. S4. The airflow generated by the aeration of the gas circulation mechanism can push the stirring rod in the stirring mechanism, which can be driven up and down by the cooperation of the return spring. The gas circulation mechanism can make the materials fully mixed and reacted, thereby improving the efficiency of sodium nitrate production; S5. After sufficient reaction, open the valve on the discharge pipe to discharge the prepared sodium nitrate solution, and then evaporate and concentrate it to obtain sodium nitrate.

[0018] The present invention provides a reactor and a method for preparing sodium nitrate using the reactor. The reactor has the following beneficial effects: The reactor and the method for preparing sodium nitrate using the reactor are characterized by the provided stirring mechanism and gas circulation mechanism. The operation of the stirring mechanism not only stirs the material solution in the reactor body, but also drives the operation of the gas circulation mechanism, thereby extracting the gas above the material solution and aerating it into the material solution, so that part of the volatilized material can be re-dissolved in the material solution to continue the reaction. This not only avoids material waste but also reduces the cost of subsequent tail gas treatment. In addition, the airflow generated by the aeration of the gas circulation mechanism can also drive the stirring component in the stirring mechanism to move up and down, thereby fully mixing and stirring the material solution and improving the reaction efficiency.

[0019] The reactor and the method for preparing sodium nitrate using the reactor can automatically adjust the pressure in the reactor body through the provided regulating mechanism, and can maintain a certain pressure of the gas during the pressure regulation process, which can play a certain driving role on the turbine fan blades in the gas circulation mechanism, thereby reducing the load of the motor in the stirring mechanism and further increasing the service life of the motor in the stirring mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of another angle of the present invention; Figure 3 It is a schematic diagram of the internal structure of the present invention; Figure 4 It is a schematic structural diagram of the driving assembly and the stirring assembly of the present invention; Figure 5 It is a structural schematic diagram of the main shaft, spline sleeve and driving shaft of the present invention; Figure 6 It is a structural schematic diagram of the stirring assembly of the present invention; Figure 7 It is a partial structural diagram of the gas fantasy mechanism of the present invention; Figure 8 It is a structural schematic diagram of the adjustment mechanism of the present invention.

[0021] In the figure, 1. kettle body; 11. upper shell; 12. lower shell; 121. air outlet; 2. stirring mechanism; 21. motor; 22. main shaft; 23. spline shaft; 24. spline sleeve; 25. stirring rod; 26. arc plate; 27. return spring; 28. protective cover; 3. gas circulation mechanism; 31. mounting plate; 32. air inlet shell; 321. air inlet; 33. gearbox; 34. driven shaft; 35. turbine blade; 36. aeration pipe; 37. aeration nozzle; 38. driving shaft; 4. adjusting mechanism; 41. adjusting plate; 42. first connecting piece; 43. spring telescopic rod; 44. second connecting piece; 45. first sealing ring; 46. second sealing ring; 5. first connecting pipe; 6. second connecting pipe; 7. feed pipe; 8. discharge pipe. DETAILED DESCRIPTION

[0022] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] Example 1: Figures 1 to 8 As shown, a reactor comprises a reactor body 1, which comprises an upper shell 11 and a lower shell 12. A stirring mechanism 2 is installed inside the reactor body 1, and the stirring mechanism 2 is used to stir the raw materials. A gas circulation mechanism 3 is installed at the bottom of the reactor body 1, and the gas circulation mechanism 3 is used to drive the flow of gas inside the reactor body 1. An adjusting mechanism 4 is installed inside the reactor body 1, and the adjusting mechanism 4 is used to adjust the pressure inside the reactor body 1.

[0024] The material solution in the kettle body 1 can be stirred by the stirring mechanism 2, and the operation of the stirring mechanism 2 can also drive the operation of the gas circulation mechanism 3, which can extract the gas above the material solution and aerate it into the material solution, so that some volatilized materials can be re-dissolved in the material solution to continue the reaction, which not only saves material waste, but also reduces the cost of subsequent tail gas treatment. The airflow generated by the aeration of the gas circulation mechanism 3 can also push the stirring mechanism 2 to move up and down, and then the material solution can be fully mixed and stirred to improve the reaction efficiency. The regulating mechanism 4 can automatically adjust the pressure in the kettle body 1, and the gas can maintain a certain pressure during the pressure adjustment process, which can play a certain driving role on the gas circulation mechanism 3, thereby reducing the load of the stirring mechanism 2 and thus improving the service life of the stirring mechanism 2.

[0025] Example 2: Figures 3 to 6 As shown, the stirring mechanism 2 includes a driving component and a stirring component slidably sleeved on the outside of the driving component, the driving component is used to drive the stirring component to rotate, and the stirring component is used to stir the material in the kettle body 1. The driving component includes a motor 21 installed on the top of the kettle body 1, and the output shaft of the motor 21 is fixedly connected to the main shaft 22, and the bottom end of the main shaft 22 is fixedly connected to the spline shaft 23. The stirring component includes a spline sleeve 24 slidably sleeved on the outside of the spline shaft 23, and two stirring rods 25 are symmetrically installed on both sides of the bottom end of the spline sleeve 24, and the outer surface of the stirring rod 25 is sequentially installed with multiple arc plates 26.

[0026] The rotation of the motor 21 can drive the main shaft 22 and the spline shaft 23 to rotate, and the spline sleeve 24 can drive the stirring rod 25 and the arc plate 26 to rotate, so as to stir the material solution in the kettle body 1.

[0027] Furthermore, a return spring 27 is fixedly connected between the top end of the spline sleeve 24 and the bottom end of the main shaft 22 , and a protective cover 28 is installed at the bottom end of the main shaft 22 and is slidably sleeved on the outside of the top end of the spline shaft 23 .

[0028] With the cooperation of the spline shaft 23 and the spline sleeve 24, the spline sleeve 24 and the stirring rod 25 can move up and down, and the return spring 27 can drive the spline sleeve 24 and the stirring rod 25 to move downward and reset after the spline sleeve 24 and the stirring rod 25 move up. The return spring 27 can be shielded and protected by the protective cover 28.

[0029] Example 3: Figures 3 to 7As shown, the gas circulation mechanism 3 includes a mounting plate 31 mounted on the bottom of the kettle body 1. An air intake housing 32 and a gearbox 33 are mounted on one side of the mounting plate 31. A driven shaft 34, which is fixedly connected to the output end of the gearbox 33, is rotatably connected to the bottom end of the air intake housing 32. A turbine blade 35 is fixedly connected to the top end of the driven shaft 34. A connecting pipe is fixedly connected between one side of the bottom end of the air intake housing 32 and one side of the kettle body 1. An aeration pipe 36 is fixedly connected to the top end of the air intake housing 32. A plurality of aeration nozzles 37 are fixedly connected to the top end of the aeration pipe 36. The aeration nozzles 37 are fixedly mounted inside the bottom end of the kettle body 1. A driving shaft 38 is fixedly connected to the input end of the gearbox 33. The top end of the driving shaft 38 is sealed and rotatably connected to the bottom of the kettle body 1, and the top end of the driving shaft 38 is fixedly connected to the bottom end of the spline shaft 23.

[0030] When the motor 21 drives the spline shaft 23 to rotate, it can also drive the driving shaft 38 at the bottom to rotate. The rotation of the driving shaft 38 can drive the gearbox 33 and the driven shaft 34 installed at the output end of the gearbox 33 to rotate, and then drive the turbine blades 35 installed at the top of the driven shaft 34 to rotate rapidly. The gas above the material solution in the kettle body 1 can be extracted and transported to the aeration pipe 36 through the connecting pipe, and sprayed out through multiple aeration nozzles 37, so that some volatilized materials can be re-dissolved in the material solution to continue the reaction, which not only saves material waste but also reduces the cost of subsequent exhaust gas treatment.

[0031] It should be noted that in this technical solution, a large gear and a small gear that mesh with each other are installed in a rotating manner in the gearbox. The large gear is fixedly connected to the bottom end of the driving shaft 38, and the small gear is fixedly connected to the bottom end of the driven shaft 34. When the driving shaft 38 drives the large gear to rotate, it can drive the small gear and the driven shaft 34 to rotate rapidly, thereby achieving a speed-increasing effect, increasing the wind force generated by the turbine blades 35, and allowing the air to flow smoothly.

[0032] Furthermore, the aeration nozzle 37 is communicated with the interior of the kettle body 1 , a one-way valve is installed inside the aeration nozzle 37 , and the aeration nozzle 37 is located below the corresponding arc-shaped plate 26 .

[0033] The one-way valve provided can prevent the material solution from flowing into the aeration nozzle 37, thereby acting as a one-way passage. As the stirring rod 25 and the curved plate 26 rotate, when the curved plate 26 rotates to above the aeration nozzle 37, the airflow aerated by the aeration nozzle 37 will push the curved plate 26 to move upward, thereby pushing the stirring rod 25 to move upward. When the curved plate 26 moves out from above the aeration nozzle 37, the spline sleeve 24 and the stirring rod 25 will move downward under the action of the return spring 27, thereby stirring the material solution at different upper and lower positions. Combined with the aeration of the aeration nozzle 37, the material solution can be fully mixed and stirred, thereby improving the reaction efficiency.

[0034] Furthermore, an air outlet 121 is provided on the top side of the lower shell 12, and an air inlet 321 is provided on the bottom side of the air inlet shell 32. Both ends of the connecting pipe are fixedly connected to the air outlet 121 and the air inlet 321 respectively.

[0035] It should be noted that both ends of the connecting pipe are connected to the air outlet 121 and the air inlet 321 respectively through flanges and threads, so as to facilitate the installation and removal of the connecting pipe.

[0036] Example 4: Figure 3 and Figure 8 As shown, the adjustment mechanism 4 includes an adjustment plate 41 that is slidably sleeved on the outside of the main shaft 22, and two first connecting members 42 are symmetrically installed on both sides of the lower surface of the adjustment plate 41. The inside of the first connecting member 42 is rotatably connected to a spring telescopic rod 43, and the bottom end of the spring telescopic rod 43 is rotatably connected to a second connecting member 44, and the second connecting member 44 is fixedly connected to the inner wall of the kettle body 1 by bolts.

[0037] When the pressure in the kettle body 1 changes, the sliding adjustment plate 41 can be raised and lowered to avoid excessive pressure in the kettle body 1. Under the action of the spring telescopic rod 43, while adjusting the pressure in the kettle body 1, the gas in the kettle body 1 can be kept at a certain pressure. At this time, the turbine blades 35 in the gas circulation mechanism 3 can be driven to a certain extent, thereby reducing the load of the motor 21 in the stirring mechanism 2 and thereby improving the service life of the motor 21 in the stirring mechanism 2.

[0038] Since the first connecting member 42 and the second connecting member 44 are both installed by bolts, the adjustment mechanism 4 can be installed and disassembled. After the adjustment mechanism 4 is disassembled, the working volume of the kettle body 1 can be increased, thereby improving the practicality of the reactor.

[0039] Furthermore, the outer surface of the adjustment plate 41 is fixedly connected to a first sealing ring 45 that cooperates with the inner wall of the kettle body 1, and the inner wall of the adjustment plate 41 is fixedly connected to a second sealing ring 46 that cooperates with the outer wall of the main shaft 22. The adjustment plate 41 and the second connecting member 44 are both located inside the upper shell 11.

[0040] The first sealing ring 45 can improve the sealing between the adjustment plate 41 and the kettle body 1, and the second sealing ring 46 can improve the sealing between the adjustment plate 41 and the main shaft 22 to avoid gas leakage.

[0041] A plurality of first connecting pipes 5 are sequentially installed on the top of the upper shell 11, a plurality of second connecting pipes 6 are sequentially installed on the top side of the lower shell 12, and a feed pipe 7 and a discharge pipe 8 are respectively installed on the top and bottom sides of the lower shell 12.

[0042] The first connecting pipe 5 and the second connecting pipe 6 are provided to facilitate installation of corresponding valve bodies and detection equipment, and the feeding pipe 7 and the discharging pipe 8 are provided to facilitate addition and discharge of materials.

[0043] Working principle: When in use, sodium hydroxide and nitric acid solution for preparing sodium nitrate are added to the reactor in sequence through the feed pipe 7. During the production process, the motor 21 in the stirring mechanism 2 is started. The rotation of the motor 21 can drive the main shaft 22 and the spline shaft 23 to rotate, and the spline sleeve 24 can drive the stirring rod 25 and the arc plate 26 to rotate, so as to stir the material solution in the reactor body 1.

[0044] When the motor 21 drives the spline shaft 23 to rotate, it can also drive the driving shaft 38 at the bottom to rotate. The rotation of the driving shaft 38 can drive the gearbox 33 and the driven shaft 34 installed at the output end of the gearbox 33 to rotate, and then drive the turbine blades 35 installed at the top of the driven shaft 34 to rotate rapidly. The gas above the material solution in the kettle body 1 can be extracted and transported to the aeration pipe 36 through the connecting pipe, and sprayed out through multiple aeration nozzles 37, so that some volatilized materials can be re-dissolved in the material solution to continue the reaction, which not only saves material waste but also reduces the cost of subsequent exhaust gas treatment.

[0045] As the stirring rod 25 and the curved plate 26 rotate, when the curved plate 26 rotates to above the aeration nozzle 37, the airflow aerated by the aeration nozzle 37 will push the curved plate 26 to move upward, and then push the stirring rod 25 to move upward. When the curved plate 26 moves out from above the aeration nozzle 37, the spline sleeve 24 and the stirring rod 25 will move downward under the action of the return spring 27, so that the material solution can be stirred at different positions above and below. In conjunction with the aeration of the aeration nozzle 37, the material solution can be fully mixed and stirred, thereby improving the reaction efficiency.

[0046] When the pressure in the kettle body 1 changes, the sliding adjustment plate 41 can be raised and lowered to avoid excessive pressure in the kettle body 1. Under the action of the spring telescopic rod 43, while adjusting the pressure in the kettle body 1, the gas in the kettle body 1 can be kept at a certain pressure. At this time, the turbine blades 35 in the gas circulation mechanism 3 can be driven to a certain extent, thereby reducing the load of the motor 21 in the stirring mechanism 2 and thereby improving the service life of the motor 21 in the stirring mechanism 2.

[0047] After sufficient reaction, open the valve on the discharge pipe to discharge the prepared sodium nitrate solution.

[0048] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0049] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A reactor, comprising a reactor body (1), characterized in that: The kettle body (1) comprises an upper shell (11) and a lower shell (12); a stirring mechanism (2) is installed inside the kettle body (1); the stirring mechanism (2) is used to stir the raw materials; a gas circulation mechanism (3) is installed at the bottom of the kettle body (1); the gas circulation mechanism (3) is used to drive the flow of gas inside the kettle body (1); and an adjustment mechanism (4) is installed inside the kettle body (1); the adjustment mechanism (4) is used to adjust the pressure inside the kettle body (1).

2. A reactor according to claim 1, characterized in that: The stirring mechanism (2) comprises a driving assembly and a stirring assembly slidably sleeved outside the driving assembly, the driving assembly is used to drive the stirring assembly to rotate, and the stirring assembly is used to stir the material in the kettle body (1), the driving assembly comprises a motor (21) mounted on the top of the kettle body (1), the output shaft of the motor (21) is fixedly connected to the main shaft (22), and the bottom end of the main shaft (22) is fixedly connected to the spline shaft (23); The stirring assembly comprises a spline sleeve (24) which is slidably sleeved on the outside of the spline shaft (23); two stirring rods (25) are symmetrically mounted on both sides of the bottom end of the spline sleeve (24); and a plurality of arc plates (26) are sequentially mounted on the outer surfaces of the stirring rods (25); A return spring (27) is fixedly connected between the top end of the spline sleeve (24) and the bottom end of the main shaft (22), and a protective cover (28) is installed at the bottom end of the main shaft (22) and is slidingly sleeved outside the top end of the spline shaft (23).

3. A reactor according to claim 2, characterized in that: The gas circulation mechanism (3) comprises a mounting plate (31) mounted on the bottom of the kettle body (1), an air intake housing (32) and a gearbox (33) are mounted on one side of the mounting plate (31), a driven shaft (34) is rotatably connected to the bottom end of the air intake housing (32) and is fixedly connected to the output end of the gearbox (33), a turbine blade (35) is fixedly connected to the top end of the driven shaft (34), a connecting pipe is fixedly connected between one side of the bottom end of the air intake housing (32) and one side of the kettle body (1), an aeration pipe (36) is fixedly connected to the top end of the aeration pipe (36), a plurality of aeration nozzles (37) are fixedly mounted inside the bottom end of the kettle body (1).

4. A reactor according to claim 3, characterized in that: The aeration nozzle (37) is connected to the interior of the kettle body (1), a one-way valve is installed inside the aeration nozzle (37), and the aeration nozzle (37) is located below the corresponding arc plate (26).

5. A reactor according to claim 3, characterized in that: An air outlet (121) is provided on one side of the top end of the lower shell (12), an air inlet (321) is provided on one side of the bottom end of the air inlet shell (32), and both ends of the connecting pipe are fixedly connected to the air outlet (121) and the air inlet (321), respectively.

6. A reactor according to claim 3, characterized in that: The input end of the gearbox (33) is fixedly connected to a driving shaft (38), the top end of the driving shaft (38) is sealingly rotatably connected to the bottom end of the kettle body (1), and the top end of the driving shaft (38) is fixedly connected to the bottom end of the spline shaft (23).

7. The reactor according to claim 1, characterized in that: The adjusting mechanism (4) comprises an adjusting plate (41) which is slidably sleeved on the outside of the main shaft (22); two first connecting members (42) are symmetrically mounted on both sides of the lower surface of the adjusting plate (41); a spring telescopic rod (43) is rotatably connected to the inside of the first connecting member (42); the bottom end of the spring telescopic rod (43) is rotatably connected to a second connecting member (44); and the second connecting member (44) is fixedly connected to the inner wall of the kettle body (1) by bolts.

8. A reactor according to claim 7, characterized in that: The outer surface of the adjustment plate (41) is fixedly connected to a first sealing ring (45) that matches the inner wall of the kettle body (1), and the inner wall of the adjustment plate (41) is fixedly connected to a second sealing ring (46) that matches the outer wall of the main shaft (22). The adjustment plate (41) and the second connecting member (44) are both located inside the upper shell (11).

9. The reactor according to claim 1, characterized in that: A plurality of first connecting pipes (5) are sequentially mounted on the top of the upper shell (11), a plurality of second connecting pipes (6) are sequentially mounted on one side of the top end of the lower shell (12), and a feed pipe (7) and a discharge pipe (8) are respectively mounted on one side of the top end and the bottom end of the lower shell (12).

10. A method for preparing sodium nitrate, using a reactor according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1 installs a valve body and a detection device on the second connecting pipe (6), the feed pipe (7) and the discharge pipe (8), and sequentially adds a sodium hydroxide solution and a nitric acid solution to the kettle body (1) through the feed pipe (7); S2, starting the stirring mechanism (2) to stir and mix the materials in the kettle (1); S3, the stirring mechanism (2) operates to drive the gas circulation mechanism (3), which extracts the gas above the material and aerates it from the bottom, so that the volatilized nitric acid is dissolved into the liquid again, reducing waste and exhaust gas treatment costs; S4, gas circulation mechanism (3) aeration airflow pushes the stirring rod (25), and the stirring rod moves up and down in cooperation with the return spring (27), thereby strengthening the material mixing reaction and improving the production efficiency; S5. After the reaction is completed, the valve of the discharge pipe (8) is opened to discharge the solution, and sodium nitrate is obtained by evaporation and concentration.

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