Three-axis linkage synthesis mixing equipment, mixing reaction method and method for preparing ferric oxalate

Abstract

The invention particularly relates to three-axis linkage synthesis mixing equipment, a mixing reaction method and a method for preparing ferric oxalate. The three-axis linkage synthesis mixing equipment comprises a motor and a gear box, a volute is arranged at the top of the outer barrel, and an air outlet is formed in one side of the volute and used for exhausting air; the three rotating shafts are arranged in the outer cylinder body, each rotating shaft is provided with an inner cylinder body, a plurality of vertically arranged gas-liquid separation plates are uniformly arranged on the upper part of each inner cylinder body along the peripheral side, and a plurality of layers of blades which are parallel to one another and are obliquely arranged are arranged on the lower part of each inner cylinder body along the peripheral side; the bottom of the volute is provided with an opening matched with the inner cylinder with the gas-liquid separation plate in size; the inner cylinders on the three rotating shafts are mutually enclosed to form an inner duct, and the rotating shafts are synchronously driven by a motor to rotate through a gearbox; a plurality of annular separation discs are arranged on the inner wall of the outer cylinder body; and an air inlet is further formed in the peripheral side of the outer cylinder body. The method has the advantages that the contact area and the contact time of the solvent and the air are fully increased and prolonged in a weightless state.

Description

Technical Field

[0001] The invention relates to the technical field of chemical mixing equipment, in particular to a three-axis linkage synthesis mixing equipment and a mixing reaction method and a method for preparing ferric oxalate. Background Art

[0002] Conventional mixing processing equipment in the prior art generally adopts reaction stirring kettles, reaction stirring tanks, reaction mixers, etc. In chemical mixing operations, the solvent containing chemicals needs to fully react with the oxygen in the air. The conventional stirring kettle can only exert a stirring force on the solvent so that the solvent is in a continuously rotating inertial system, and it cannot increase the contact area with the oxygen in the air. Some prior arts have made improvements to this technical problem by adding an aeration device to the stirring kettle to increase the mixing amount of air in the stirred solvent. However, this technical solution is still not obvious and efficient enough in increasing the efficiency of the reaction between air oxygen and solvent.

[0003] Therefore, it is urgent to design a three-axis linkage synthesis mixing equipment and a mixing reaction method and a method for preparing ferric oxalate to increase the contact area between the solvent containing chemicals and the air and accelerate the reaction speed and efficiency of oxygen in the air and the chemicals. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a three-axis linkage synthesis mixing device and a mixing reaction method and a method for preparing ferric oxalate, so as to increase the contact area between a solvent containing chemicals and air, and accelerate the reaction speed and efficiency of oxygen in the air and chemicals.

[0005] In order to achieve the above-mentioned purpose, a three-axis linkage synthesis mixing equipment is designed, comprising: a motor and a gear box; an outer cylinder, a volute is provided on the top of the outer cylinder, and an air outlet is provided on one side of the volute for exhaust; three rotating shafts are arranged in the outer cylinder, and an inner cylinder is provided on each rotating shaft, and a plurality of vertically arranged gas-liquid separation plates are evenly arranged along the circumference of the upper part of the inner cylinder, and a plurality of layers of blades parallel to each other and inclined are provided along the circumference of the lower part of the inner cylinder; an opening matching the size of the inner cylinder with the gas-liquid separation plate is provided at the bottom of the volute; the inner cylinders on the three rotating shafts are mutually enclosed to form an inner channel, and the rotating shafts are synchronously driven to rotate by the motor through the gear box; the blades are used to generate centrifugal gravity through rotation to lift and shear the liquid in the outer cylinder into atomized particles, and at the same time drive the gas in the outer cylinder to rise to supply gas for the mixing reaction in the equipment; a plurality of annular separation disks are provided on the inner wall of the outer cylinder, and an air inlet is also provided on the circumference of the outer cylinder.

[0006] Preferably, the present invention also includes: the volute includes an inner circular flow channel arranged in the center and an outer circular flow channel arranged outside the inner circular flow channel, one end of the outer circular flow channel is connected to the inner circular flow channel, and the other end is connected to the air outlet; a reflow gap channel is also provided at the bottom of the inner circular flow channel, the reflow gap channel connects the volute and the outer cylinder, moisture remains in the air entering the volute, the inner circular flow channel and the outer circular flow channel of the volute form a dynamic resistance in the volute, the dynamic resistance causes the moisture to form condensation droplets on the inner wall of the volute, and the droplets flow back to the outer cylinder through the reflow gap channel.

[0007] Preferably, the present invention also includes: the three rotating shafts are evenly arranged along the circumferential direction of the central axis of the outer cylinder and are located inside the outer cylinder, the inner cylinders on the three rotating shafts are mutually enclosed to form an inner duct, and the gaps between the inner cylinders on the three rotating shafts and the outer cylinder form an outer duct.

[0008] Preferably, the present invention also includes: a sealed shell is also provided on the outside of the equipment, a shell air inlet and a shell air outlet are provided on the peripheral side of the shell, the shell air outlet is connected to the air outlet of the volute, and the shell air inlet is connected to the air inlet on the outer cylinder.

[0009] Preferably, the present invention also includes: among the upper and lower adjacent blades, the shearing end point of the upper blade matches with the shearing starting point of the adjacent lower blade to form a matching relationship with an inclined angle, and the shearing area of ​​each layer of blades is spirally covered along the axial direction of the impeller cylinder to form a continuous inclined shearing channel.

[0010] Preferably, the present invention further comprises: the blade is used for cutting, shearing, mixing and dispersing the liquid in the outer cylinder.

[0011] Preferably, the present invention further comprises: a liquid inlet is provided in the middle of the outer cylinder, and a liquid outlet is provided at the bottom of the inner and outer cylinders.

[0012] Preferably, the present invention further comprises: three rotating bearing bases are arranged on the outer side of the bottom of the outer cylinder, and the lower ends of the three rotating shafts pass through the outer cylinder and are arranged in the rotating bearing bases.

[0013] The present invention also provides a mixing reaction method using the three-axis linkage synthesis mixing device, and the method is specifically as follows: S1. Add the mixture or compound to be processed into the interior of the device through the liquid inlet in the middle of the device; S2. Start the motor to drive the three rotating shafts and the inner cylinder to rotate synchronously; S3. The inclined blades on the inner cylinder cause the inner channel surrounded by the inner cylinder of the three rotating shafts to generate an upward airflow; S4. The upward airflow pushes the mixture or compound to move upward from the bottom of the outer cylinder, and during the movement, the blades of the inner cylinder cut, shear, mix and disperse the mixture or compound; S5. The mixture or compound is separated into gas and liquid at the gas-liquid separation plate at the top of the outer cylinder, and the gas separated from the gas and liquid enters the volute from the opening at the bottom of the volute. Under the action of air resistance in the volute, the moisture in the air forms droplets and condenses into droplets through the wall and flows back into the equipment, and the gas is discharged at the volute outlet; a. The gas rises in the inner channel and enters the top of the outer cylinder. The gas-liquid separation plate of the inner cylinder on the three rotating shafts rotates to complete the filtrate of the liquid in the gas. After the gas enters the volute, the moisture is further separated on the inner wall of the volute and then discharged from the outlet; b. The liquid mixture or compound is scattered on the separation disk on the inner wall of the outer cylinder under the diffusion of the inner cylinder on the three rotating shafts, and flows into the liquid outlet after repeated mixing along the separation disk by stratification under the action of gravity; S6. The gas outside the outer cylinder enters from the air inlet, and drives the liquid mixture or compound flowing down under the action of gravity to re-enter the inner channel for mixing through the rotating blades on the inner cylinder; S7. Repeat the above steps to achieve a continuous cycle mixing reaction.

[0014] The present invention also provides a method for preparing ferrous oxalate, which is specifically as follows: A1. Adding ferrous oxalate solution to the three-axis linkage synthesis mixing equipment; A2. Sending air into the equipment at a flow rate of 100m³-150m³ / h through the blower of the equipment to promote the oxidation reaction; A3. Using the three rotating axes to rotate in a linked manner to mix air and liquid at high speed, generating nano molecules with bubble dynamics in the equipment, thereby achieving oxidation of ferrous oxalate; A4. Without adding hydrogen peroxide or any external oxidant, adjusting the equipment speed to 800 r / min and maintaining the temperature at 30°C; A5. Under the above conditions, sending air into the equipment for continuous mixing and stirring for 2 hours to complete the oxidation conversion of ferrous oxalate to form ferric oxalate.

[0015] Compared with the prior art, the present invention has the following advantages: Based on the principles of fluid mechanics and aerodynamics, the solvent liquid containing chemicals is cut, sheared, mixed and dispersed, and the air intake and air flow rate in the mixing container are increased so that the solvent can remain in a weightless state. The solvent in a weightless state fully increases the contact area and contact time with the air, which speeds up the reaction efficiency of the chemicals per unit time, improves the process and efficiency of chemical processing, shortens the processing time of chemical processing, and reduces the processing workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 , is a front perspective view of the present invention; Figure 2 , is a top perspective view of the present invention; Figure 3 , is a schematic diagram of the inner cylinder of the present invention; Figure 4 , is a top view schematic diagram of the blade layout on the inner cylinder of the present invention; In the figure: 1 outer cylinder, 2 volute, 2.1 inner circular flow channel, 2.2 outer circular flow channel, 3 gas outlet, 4 rotating shaft, 5 inner cylinder, 6 gas-liquid separation plate, 7 blade, 7.1 shear end point, 7.2 shear start point, 8 separation plate, 9 liquid outlet, 10 inner channel, 11 outer channel. DETAILED DESCRIPTION

[0017] In order to make the purpose, principle and structure of the present invention more clear, it is further described below in conjunction with the drawings and specific embodiments.

[0018] The invention provides a three-axis linkage synthesis mixing device and a mixing reaction method and a method for preparing ferric oxalate.

[0019] Embodiment 1: See also Figures 1 to 4 This embodiment provides a three-axis linkage synthesis mixing device, which is set on the ground through a frame structure and includes: a motor, a gear box, an outer cylinder 1 and a shell.

[0020] The outer cylinder 1 is arranged in a housing of a sealing structure, the motor and the gear box are arranged on the top of the outer cylinder 1, and a volute 2 is also arranged on the top of the outer cylinder 1, and the volute 2 forms a avoidance with the motor and the gear box. Three openings are opened at the bottom of the volute 2 to form a connection with the outer cylinder 1. Several layers of annular separation discs 9 are also arranged on the inner wall of the outer cylinder 1, and an air inlet is also arranged on the peripheral side of the outer cylinder 1.

[0021] Three rotating shafts 4 are evenly arranged in the outer cylinder 1 along the circumferential direction of the central axis of the outer cylinder 1. The top ends of the three rotating shafts 4 are connected to the motor through a gear box, and the motor can simultaneously drive the three rotating shafts 4 to perform synchronous rotation. An inner cylinder 5 is also arranged on each rotating shaft 4. The inner cylinder 5 is a cylinder, and a through hole for accommodating the rotating shaft 4 is opened in the vertical direction of the center of the inner cylinder 5.

[0022] A plurality of gas-liquid separation plates 6 are arranged on the upper part of the inner cylinder 5 along the outer side surface. The rotation of the rotating shaft 4 drives the inner cylinder 5 and thus drives the gas-liquid separation plates 6 to rotate. The gap formed by the inner cylinders 5 enclosed by the three rotating shafts 4 is an inner channel 10. The inner channel 10 is at the central axis of the outer cylinder 1. The gap between the inner cylinder 5 and the outer cylinder 1 forms an outer duct 11. The airflow can flow between the inner channel 10 and the outer duct 11 and fully contact and mix with the liquid in the outer cylinder 1.

[0023] The inner diameter of the opening at the bottom of the volute 2 matches the outer diameter of the inner cylinder 5 with the gas-liquid separation plate 6, with a slight gap left.

[0024] The lower part of the inner cylinder 5 is provided with several layers of parallel blades 7 along the outer circumference. The blades 7 are all inclined and evenly arranged along the circumference of the inner cylinder 5. The blades 7 are located inside the outer cylinder 1 and in the lower section of the connecting cavity, and a continuous shearing track is formed between the upper and lower adjacent blades 7.

[0025] Specifically, the top of an inclined blade is the shearing starting point 7.2, and the bottom is the shearing end point 7.1. Among the upper and lower adjacent blades 7, the shearing end point 7.1 of the upper blade 7 and the shearing starting point 7.2 of the adjacent lower blade 7 are in a matching relationship. By setting a phase difference between the upper and lower adjacent blades 7, a matching relationship with an inclined angle can be formed between the upper and lower adjacent blades 7. The shearing areas of each layer of blades 7 are spirally covered along the axial direction of the inner cylinder 5 to form a continuous inclined shearing channel.

[0026] The inner cylinder 5 is driven by the motor to rotate at a high speed, and the blade 7 and the gas-liquid separation plate 6 rotate accordingly. Under the action of the rotation of the blade 7 and the inclined shear channel, the blade 7 generates a centrifugal force on the liquid and gas in the outer cylinder 1, driving and guiding the liquid and gas to move upward along the inclined shear channel. The liquid collides and shears with the blades 7 on the upper and lower layers between the inclined shear channels, and the liquid is sheared into atomized particles. The liquid in the atomized particle state is fully contacted and mixed with the rising gas.

[0027] When the un-atomized liquid, atomized particles and air are lifted to the upper part of the outer cylinder 1 by the blade 7, they are separated from the blade 7 and collide with the gas-liquid separation plate 6. The gas-liquid separation plate 7 is vertically arranged, and as the inner cylinder 5 rotates, the gas-liquid separation plate 7 applies a horizontal lateral force to the un-atomized liquid and the atomized particles, so that the un-atomized liquid and the atomized particles move in the lateral direction away from the inner cylinder 5 and collide with the separation disk 9 of the outer cylinder 1.

[0028] The un-atomized liquid with a higher density and a larger mass is thrown onto the separation disk 9 along the horizontal lateral direction under the lateral sweeping rotation of the gas-liquid separation plate 6, and flows downward under the action of gravity, preventing the un-atomized liquid from entering the volute 2.

[0029] The atomized particles with higher density and mass collide with the annular separation disk 9 to form droplets. Under the action of gravity, the droplets flow down layer by layer along the multi-layer separation disks to the bottom of the outer cylinder 1, preventing the atomized particles from entering the volute 2, and also mixing with the rising gas during the laminar flow.

[0030] Air with lower density and smaller mass will flow into the volute 2 from the gap between the openings at the top of the outer cylinder 1 and the bottom of the volute 2 driven by the rising air.

[0031] The volute 2 includes an inner circular flow channel 2.1 and an outer circular flow channel 2.2. The bottom of the inner circular flow channel 2.1 is connected to the outer cylinder 1. The outer circular flow channel 2.2 is arranged around the circumference of the inner circular flow channel 2.1. One end of the outer circular flow channel 2.2 is connected to the inner circular flow channel 2.1, and the other end is connected to the air outlet 3. The gas entering the volute 2 first enters the inner circular flow channel 2.1, then flows into the outer circular flow channel 2.2 and finally flows out from the air outlet 3. The outer circular flow channel 2.2 is a structure that changes from narrow to wide from the inner circular flow channel 2.1 to the air outlet 3. Under the action of this structure of the volute 2, part of the moisture in the air entering the volute 2 will condense into droplets on the inner wall of the volute 2. A number of reflux gap channels with microporous structures are provided at the bottom of the volute 2, and the reflux gap channels are connected to the outer cylinder 1. Under the action of gravity, liquid droplets flow into the reflux gap channels along the inner wall of the volute 2, and flow into the outer cylinder 1 from the reflux gap channels, so that the liquid flows back into the equipment again.

[0032] Three rotating bearing seats are also provided on the outside of the bottom of the outer cylinder 1. The bottoms of the three rotating shafts 4 pass through the outer cylinder 1 and are arranged in the rotating bearing base. The rotating bearing base provides support for the rotating shaft 4 and ensures the free rotation of the rotating shaft 4.

[0033] An air inlet is also provided on the side wall of the shell, and the air inlet of the shell is communicated with the air inlet provided on the side wall of the outer cylinder 1. External air is sprayed into the outer cylinder 1 from the air inlet through an external fan or a booster pump.

[0034] The side of the outer cylinder 1 is provided with a liquid inlet, and the bottom of the outer cylinder 1 is provided with a liquid outlet 12, and a clearance is formed between the liquid inlet and the volute 2, the motor, and the gear box. The liquid deposited at the bottom of the outer cylinder 1 under the action of gravity flows out from the liquid outlet 12, passes through the liquid circulation pipeline and the booster pump, and is sprayed into the outer cylinder 1 again from the liquid inlet.

[0035] A vacuum machine, a pressure gauge, a negative pressure gauge and a thermometer are also provided in the outer cylinder 1. Preferably, the air inlet of the shell can be closed, and the vacuum negative pressure state in the outer cylinder 1 can be realized by continuously pumping air from the air outlet 3 through the fan.

[0036] Embodiment 2: The present embodiment provides a mixing reaction method using the three-axis linkage synthesis mixing equipment, and the method is specifically as follows: S1. Add the mixture or compound to be processed into the interior of the equipment through the liquid inlet at the top of the equipment; S2. Start the motor to drive the three rotating shafts 4 and the inner cylinder 5 to rotate synchronously; S3. The inclined blade 7 on the inner cylinder 5 causes the inner passage 10 surrounded by the three rotating shafts 4 and the inner cylinder 5 to generate an upward airflow; S4. The upward airflow pushes the mixture or compound to move upward from the bottom of the outer cylinder 1, and at the same time, the blade 7 of the inner cylinder 5 cuts, shears, mixes and disperses the mixture or compound; S5. The mixture or compound is separated into gas and liquid at the gas-liquid separation plate 6 at the top of the outer cylinder 1, and the gas separated from the gas and liquid forms droplets in the volute 2 and condenses into droplets through the wall and flows back into the equipment, and the gas is discharged at the air outlet 3 of the volute 2. a. The gas rises in the inner channel 10 of the rotating shaft 4 and enters the top of the outer cylinder 1. The gas-liquid separation plate 6 of the inner cylinder 5 on the three rotating shafts 4 rotates to complete the filtrate of the liquid in the gas. After the gas enters the volute 2, the moisture is further separated on the inner wall of the volute 2 and then discharged from the gas outlet 3; b. The liquid mixture or compound is scattered on the separation disk 9 on the inner wall of the outer cylinder 1 under the diffusion of the inner cylinder 5 of the three rotating shafts 4, and is repeatedly mixed in layers along the separation disk 9 under the action of gravity and then flows into the liquid outlet 12; S6. The gas outside the outer cylinder 1 enters from the air inlet, passes through the rotating blade 7 on the inner cylinder 5, and drives the liquid mixture or compound flowing down under the action of gravity to re-enter the inner channel 10 for mixing; S7. Repeat the above steps to achieve a continuous cycle mixing reaction.

[0037] Embodiment three: The present embodiment provides a method for preparing ferrous oxalate, and the specific steps are as follows: A1. Adding ferrous oxalate solution into a three-axis linkage synthesis mixing device; A2. Sending air into the device at a flow rate of 100m³-150m³ / h through the blower of the device to promote the oxidation reaction; A3. Using the three-axis linkage rotation to mix the air and liquid at high speed, generating nano molecules with bubble dynamics in the device, and realizing the oxidation of ferrous oxalate; A4. Without adding hydrogen peroxide or any external oxidant, adjusting the speed of the device to 800 r / min and maintaining the temperature at 30°C; A5. Under the above conditions, stirring is continued for 2 hours to complete the oxidation conversion of ferrous oxalate to generate ferric oxalate.

[0038] In the test of processing lithium battery electrolyte containing ferrous oxalate, the equipment can save 20% of raw materials, improve compound processing efficiency by 35%, and reduce energy consumption by 25%. The processing time is shortened by 50%, energy consumption is reduced by 30%, and production efficiency is increased by 40%. Changing the process conditions to process compound processing, optimizing and shortening the time, significantly reducing the processing process, improving processing efficiency and reducing costs.

[0039] Example: Lithium battery electrolyte iron oxalate processing test data table: No. 1 Ferrous oxalate is added with 20% oxidant hydrogen peroxide and left in the air for 7 days to generate ferric oxalate.

[0040] No. 2 Ferrous oxalate without adding oxidant hydrogen peroxide, using the equipment described in Example 1, fan 100m 3 / h air oxidation, generating iron oxalate in 2 hours.

[0041] No. 3 Ferrous oxalate without adding oxidant hydrogen peroxide, using the equipment described in Example 1, fan 150m 3 / h air oxidation, ferrous oxalate is generated in 2 hours.

[0042] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical solutions and novel concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A three-axis linkage synthesis mixing device, characterized in that: include: Motors and gearboxes; An outer cylinder, a volute is provided on the top of the outer cylinder, and an air outlet is provided on one side of the volute for exhausting air; Three rotating shafts are arranged in the outer cylinder, each rotating shaft is provided with an inner cylinder, the upper part of the inner cylinder is evenly provided with a plurality of vertically arranged gas-liquid separation plates along the circumference, and the lower part of the inner cylinder is provided with a plurality of layers of blades which are parallel to each other and inclined along the circumference; The bottom of the volute is provided with an opening that matches the size of the inner cylinder with the gas-liquid separation plate; The inner cylinders on the three rotating shafts are mutually enclosed to form an inner channel, and the rotating shafts are synchronously driven to rotate by the motor through the gear box; The blade is used to generate centrifugal force through rotation to lift the liquid in the outer cylinder and shear it into atomized particles, while driving the gas in the outer cylinder to rise to supply gas for the mixed reaction in the device; A plurality of annular separation discs are arranged on the inner wall of the outer cylinder, and an air inlet is also arranged on the peripheral side of the outer cylinder.

2. A three-axis linkage synthesis mixing device as claimed in claim 1, characterized in that: The volute comprises an inner circular flow channel arranged at the center and an outer circular flow channel arranged outside the inner circular flow channel, one end of the outer circular flow channel is connected to the inner circular flow channel, and the other end is connected to the air outlet; A reflow gap channel is also provided at the bottom of the inner circular flow channel, which connects the volute and the outer cylinder. There is moisture in the air entering the volute, and the inner circular flow channel and the outer circular flow channel of the volute form a dynamic resistance in the volute. The dynamic resistance causes the moisture to form condensed droplets on the inner wall of the volute, and the droplets flow back into the outer cylinder through the reflow gap channel.

3. A three-axis linkage synthesis mixing device as claimed in claim 1, characterized in that: The three rotating shafts are evenly arranged along the circumferential direction of the central axis of the outer cylinder and are located inside the outer cylinder. The inner cylinders on the three rotating shafts are mutually surrounded to form an inner channel, and the gaps between the inner cylinders on the three rotating shafts and the outer cylinder form an outer channel.

4. A three-axis linkage synthesis mixing device as claimed in claim 1, characterized in that: A sealed shell is also provided on the outside of the equipment, and a shell air inlet and a shell air outlet are provided on the circumference of the shell. The shell air outlet is connected to the air outlet of the volute, and the shell air inlet is connected to the air inlet on the outer cylinder.

5. A three-axis linkage synthesis mixing device as claimed in claim 1, characterized in that: Among the upper and lower adjacent blades, the shearing end point of the upper blade matches the shearing starting point of the adjacent lower blade, forming a matching relationship with an inclined angle. The shearing area of ​​each layer of blades is spirally covered along the axis of the impeller cylinder, forming a continuous inclined shearing channel.

6. A three-axis linkage synthesis mixing device as claimed in claim 5, characterized in that: The blades are used for cutting, shearing, mixing and dispersing the liquid in the outer cylinder.

7. A three-axis linkage synthesis mixing device as claimed in claim 1, characterized in that: A liquid inlet is arranged in the middle of the outer cylinder, and a liquid outlet is arranged at the bottom of the inner and outer cylinders.

8. A three-axis linkage synthesis mixing device as claimed in claim 1, characterized in that: Three rotating bearing bases are arranged on the outer side of the bottom of the outer cylinder, and the lower ends of the three rotating shafts pass through the outer cylinder and are arranged in the rotating bearing bases.

9. A mixing reaction method using the three-axis linkage synthesis mixing device according to any one of claims 1 to 8, characterized in that: The method is specifically as follows: S1. Add the mixture or compound to be processed into the device through the liquid inlet in the middle of the device; S2. Start the motor to drive the three rotating shafts and the inner cylinder to rotate synchronously; S3. The inclined blades on the inner cylinder generate an upward airflow in the inner passage enclosed by the inner cylinder of the three rotating shafts; S4. The rising airflow pushes the mixture or compound upward from the bottom of the outer cylinder, and during the movement, the blade of the inner cylinder cuts, shears, mixes and disperses the mixture or compound; S5. The mixture or compound is separated into gas and liquid at the gas-liquid separation plate on the top of the outer cylinder. The separated gas enters the volute from the opening at the bottom of the volute. Under the action of air resistance in the volute, the moisture in the air forms droplets and condenses into droplets through the wall and flows back into the equipment. The gas is discharged at the volute outlet. a. The gas rises in the inner channel and enters the top of the outer cylinder. The gas-liquid separation plates of the inner cylinder on the three rotating shafts rotate to complete the filtration of the liquid in the gas. After the gas enters the volute, the moisture is further separated on the inner wall of the volute and then discharged from the gas outlet; b. The liquid mixture or compound is scattered on the separation disk on the inner wall of the outer cylinder under the diffusion of the three rotating shafts and the inner cylinder, and flows into the liquid outlet after repeated mixing along the separation disk by gravity; S6. The gas outside the outer cylinder enters from the air inlet, passes through the rotating blades on the inner cylinder, and drives the liquid mixture or compound flowing down under the action of gravity to re-enter the inner channel for mixing; S7. Repeat the above steps to achieve continuous cycle mixing reaction.

10. A method for preparing ferric oxalate, characterized in that: The method is specifically as follows: A1. Add ferrous oxalate solution to any one of claims 1-8 as described in the three-axis linkage synthesis mixing device; A2. The air is sent into the equipment through the equipment's fan at a flow rate of 100m³-150m³ / h to promote the oxidation reaction; A3. The three-axis linkage rotation is used to mix air and liquid at high speed, generating nano-molecules with bubble dynamics in the device, thereby achieving the oxidation of ferrous oxalate; A4. Adjust the equipment speed to 800 r / min and maintain the temperature at 30°C without adding hydrogen peroxide or any external oxidant; A5. Under the above conditions, air is introduced and the mixture is continuously stirred for 2 hours to complete the oxidation conversion of ferrous oxalate to form ferric oxalate.

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