A ferrous sulfate crystallization device

Abstract

This invention relates to the field of water treatment agent production, and particularly to a ferrous sulfate crystallization apparatus. It includes a crystallization tank, a separator, a drive mechanism, and a recovery mechanism. The crystallization tank is equipped with a raw liquid inlet, a refrigerant inlet, a refrigerant outlet, an outlet pipe, an annular pipe, and a cleaning mechanism. One end of the annular pipe is connected to the refrigerant inlet, and the other end is connected to the refrigerant outlet pipe. The outlet pipe is connected to the separator, the separator is connected to the recovery mechanism, and the recovery mechanism is connected to the raw liquid inlet. The cleaning mechanism is fixedly connected to the crystallization tank and slidably connected to the annular pipe. The drive mechanism is rotatably connected to the annular pipe.

Description

Technical Field

[0001] This solution belongs to the field of water treatment agent production, specifically involving a ferrous sulfate crystallization device. Background Technology

[0002] In the industrial production of ferrous sulfate, vacuum crystallization is generally used to precipitate most of the dissolved ferrous sulfate as ferrous sulfate heptahydrate crystals, which are then separated by a rotary filter. Industrially, freeze crystallization is more commonly used. This method involves placing a refrigerant in a freezing pan to freeze and crystallize the solution within the container.

[0003] A prior art ferrous sulfate cryogenic crystallization apparatus, patent application number "CN202023074123.X", includes: a storage tank, a crystallization tank, and a separator. The storage tank is provided with a first inlet and a first outlet pipe. The crystallization tank is provided with a second inlet, a third inlet, a first solid-liquid outlet, an inlet pipe, an outlet pipe, and a stirring device. An annular pipe is provided inside the crystallization tank. One end of the annular pipe is connected to the inlet pipe, and the other end of the annular pipe is connected to the outlet pipe. The first outlet pipe is connected to the second inlet through a first conveying pipe. The first solid-liquid outlet is connected to the inlet of the separator through a second conveying pipe. The outlet pipe of the separator is connected to the third inlet through a third conveying pipe.

[0004] However, the aforementioned high-efficiency pickling device still has some obvious defects during use: 1. The freezing efficiency is low, and the crystal precipitation time is long, which is not conducive to industrial production; 2. During crystallization, the crystals stick to the equipment for a long time, causing them to harden and become difficult to remove, which is also not conducive to the later maintenance of the equipment; 3. The water content of ferrous sulfate crystals is still high, resulting in low quality of ferrous sulfate crystals produced, which is not conducive to the later industrial processing. Summary of the Invention

[0005] This solution provides a ferrous sulfate crystallization apparatus to solve the problem of poor crystallization and detachment.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a ferrous sulfate crystallization apparatus, comprising a crystallization tank, a separator, a drive mechanism, and a recovery mechanism. The crystallization tank includes a raw liquid inlet pipe, a refrigerant inlet pipe, a refrigerant outlet pipe, and an outlet pipe. The outlet pipe is connected to the separator, the separator is connected to the recovery mechanism, and the recovery mechanism is connected to the raw liquid inlet. The apparatus also includes an annular pipe, one end of which is connected to the refrigerant inlet, and the other end of which is connected to the refrigerant outlet pipe. The annular pipe is fixedly connected to the drive mechanism and is rotatably mounted. The apparatus further includes a cleaning mechanism, comprising a connecting rod, a stepped rod, and an annular scrubbing ball. The stepped rod is hollow and slidably connected to the connecting rod through the hollow portion. The annular scrubbing ball is fixedly connected to the stepped rod and slidably connected to the annular pipe.

[0007] The principle of this scheme is as follows: Ferrous sulfate solution to be crystallized is added to the crystallization tank, and then a refrigerant is added to the annular tube. When the refrigerant enters the annular tube, the annular tube rotates, and ferrous sulfate begins to crystallize under the rapid cooling environment. As the annular tube rotates, the annular scrubbing ball moves along the direction of rotation on the annular tube. The annular tube rotates 2-3 times, then rotates in the opposite direction, and the annular scrubbing ball moves in the opposite direction on the annular tube, continuing the cycle. During the continuous movement of the annular scrubbing ball, the material adhering to the wall of the annular tube can be brushed off, thus solving the problem of poor crystal detachment in the equipment. Once crystallization is complete, the ferrous sulfate crystals can be recovered.

[0008] The advantages of this solution are as follows: the annular tube can be driven to rotate, which not only cools but also stirs the tube. The cleaning mechanism is slidably connected to the annular tube. By rotating the annular tube, relative movement is generated, thereby cleaning the annular tube and solving the problem of crystal slagging and failure to detach.

[0009] Furthermore, an outer tube is provided outside the annular tube, and gas is provided between the two tubes. The outer tube has holes evenly distributed on it, and elastic material is provided on the holes. The outer tube is a one-piece molded tube.

[0010] The principle of this solution is as follows: when the refrigerant enters the annular tube, it actually enters the first layer of tubes. When the air is cooled, the pressure decreases. The surface elastic material deforms due to the pressure change between the first and second layers of tubes. As the pressure decreases, it dents inward, and concave dots are generated on the surface of the annular tube. After the refrigerant is released, the temperature rises and the pressure inside the annular tube returns to normal, and the concave dots also return to flatness.

[0011] The beneficial effects of this solution are as follows: by utilizing the principle that air pressure decreases when it is cooled, a method is created in which the refrigerant entering the annular tube produces many concave dots, resulting in more surface areas for crystal adhesion and more area for heat conduction, thus solving the problem of low freezing efficiency. After the temperature rises, the concave dots return to flatness, which helps the crystals fall off.

[0012] Furthermore, the drive mechanism includes a motor, a drive gear, a driven gear, and a solenoid valve assembly. The motor is connected to the drive gear, the drive gear and the driven gear mesh, the driven gear is coaxially connected to the annular tube, and the driven gear is located at the inlet of the annular tube. The solenoid valve assembly is fixedly connected to the annular tube and is located at the inlet and outlet of the annular tube, respectively.

[0013] The advantages of this design are: the rotatable solenoid valve ensures that the refrigerant inside the annular tube remains within the first layer of tubes and does not flow while the annular tube rotates. The drive mechanism rotates the annular tube around its central axis.

[0014] Furthermore, the cleaning mechanism also includes T-shaped rods, which are fixedly connected in groups to the inner wall of the crystallization tank, and the T-shaped tubes are slidably connected to the connecting rods.

[0015] The beneficial effects of this solution are as follows: the rotation of the annular tube drives the stepped rod to move up and down. When too much crystal is attached to the outer surface of the annular tube, the I-shaped tube will generate relative movement perpendicular to the inner wall of the crystallization tank. At this time, the T-shaped rod acts as a limiting slide rail.

[0016] Furthermore, the separator includes a main separator housing and a separation filter housing. The main separator housing is provided with a limit block and a discharge port baffle. The limit block is located on the inner wall of the main separator housing, and the discharge port baffle is rotatably connected to the main separator housing.

[0017] The beneficial effects of this solution are as follows: After the rotation ends, the solenoid valve is opened, and the crystal liquid is discharged into the separator through the outlet pipe. The separation filter box inside the separator will catch the crystal liquid, and at this time the crystals will be retained on the filter box. The filtered liquid drips to the bottom of the main body of the separator, which reduces the water content of the crystals and improves the quality of the crystals, thus preparing for the recovery of incomplete crystal liquid.

[0018] Furthermore, the annular scrubbing ball includes an annular ring and a metal wire mesh, with the metal wire mesh fixedly wound around the annular ring.

[0019] The advantages of this solution are as follows: the annular tube is driven to rotate by the drive mechanism. At this time, the annular ring and the metal wire mesh are wrapped around the annular tube. As the annular tube rotates, the annular scrubbing ball moves relative to the annular tube, thereby completing the scrubbing. The combination of the annular ring and the metal wire mesh is not only more durable but also has a better cleaning effect, making it more suitable for industrial cleaning, thus solving the problem of crystal caking and difficulty in detaching.

[0020] Furthermore, the recycling mechanism includes a recycling pipeline and a pump. One end of the recycling pipeline is connected to the lower part of the separator, and the other end of the recycling pipeline is connected to the raw liquid inlet. A pump is installed on the recycling pipeline.

[0021] The beneficial effects of this solution are: the recovery pipeline uses a pump to extract the incompletely crystallized liquid filtered from the separator and returns it to the raw liquid inlet for recovery and recrystallization, thereby improving the crystallization rate of the same batch of raw liquid. Attached Figure Description

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

[0023] Figure 2 This is a cross-sectional view of the annular tube of the present invention. Detailed Implementation

[0024] The following detailed explanation illustrates the specific implementation methods:

[0025] The reference numerals in the accompanying drawings of the instruction manual include: 1. Refrigerant inlet; 2. Drive gear; 3. Crystallizer; 4. Annular scrubbing ball; 5. Annular pipe; 6. Stepped rod; 7. Connecting rod; 8. T-shaped rod; 9. Solenoid valve; 10. Discharge pipe; 11. Separator main body; 12. Discharge port baffle; 13. Separation filter box; 14. Rotary joint; 15. Driven gear; 16. Pump; 17. Recovery pipe; 18. Rotatable solenoid valve; 19. Refrigerant discharge pipe; 20. Motor; 22. Raw material inlet.

[0026] The basic invention is as follows: Figure 1 As shown: A ferrous sulfate crystallization apparatus includes a crystallization tank 3. The crystallization tank 3 includes a raw liquid inlet 22, a refrigerant inlet 1, a refrigerant outlet pipe 19, an annular pipe 5, an outlet pipe 10, a stepped rod 6, an I-shaped connecting rod 7, a T-shaped rod 8, and an annular scrubbing ball 4. One end of the annular pipe 5 is connected to the refrigerant inlet 22 through a rotary joint, and the other end of the annular pipe 5 is connected to the refrigerant outlet pipe 19 through a rotary joint. The annular pipe 5 is mounted on a driving mechanism and is rotatably mounted inside the crystallization tank 3. The cleaning mechanism includes the connecting rod 7, the stepped rod 6, the T-shaped rod 8, and the annular scrubbing ball 4. The stepped rod 6 is hollow and is slidably connected to the connecting rod 7. The annular scrubbing ball 4 is fixedly connected to the stepped rod 6 and slidably connected to the annular pipe 5.

[0027] This device also includes a drive mechanism consisting of a motor 20, a drive gear 2, a driven gear 15, a rotary joint 14, and a rotatable solenoid valve 18; a separator consisting of a main separator housing 11, a discharge port baffle 12, and a separation filter box 13; and a recovery mechanism consisting of a recovery pipe 17 and a pump 16. After the refrigerant is loaded, the drive mechanism is turned on, and the motor 20 is started. The rotatable solenoid valve 18 and the rotary joint 14 are then turned on, allowing the annular pipe 5 to rotate around the central axis in the crystallization tank 3. During the rotation, crystallization is aided. After crystallization is complete, the drive mechanism is turned off, and the solenoid valve 9 is opened to discharge the crystallized liquid through the outlet pipe 10 into the separation filter box 13 in the separator. The crystal liquid is filtered out through the separation filter box 13, and the incompletely crystallized liquid is dripped into the bottom of the main separator housing 11. The pump 16 is turned on and the liquid enters the raw liquid inlet pipe 22 through the recovery pipe 17 and then re-enters the crystallization tank 3 for a second crystallization, thus improving the crystallization rate.

[0028] During operation, the ferrous sulfate solution to be crystallized is added to the crystallization tank 3 through the raw material port 22. Then, refrigerant is added to the annular tube 5 through the refrigerant inlet 22. After adding the refrigerant, the solenoid valve is closed, and the motor 20 is turned on to rotate the annular tube 5. The ferrous sulfate solution cools down rapidly, causing crystals to precipitate. As the annular tube 5 rotates, the annular scrubbing balls 4 on the annular tube 5 move relative to each other, cleaning the annular tube. The motor 20 is set to rotate clockwise and counterclockwise in a cyclical manner, and the number of clockwise rotations of the motor 20's rotating shaft is... The number of counter-clockwise rotations corresponds to the relative movement distance of the annular washing ball 4 on the annular tube 5. When crystallization is complete, the lower solenoid valve 9 is opened, and the crystallized material is discharged into the main chamber 11 of the separator. The crystallized material still contains ferrous sulfate solution. At this point, the mixed ferrous sulfate solution is separated through the separation filter box 13 and enters the recovery mechanism. It is then pumped into the raw liquid inlet 22 by the pump 16 and re-enters the crystallization tank 3 for recrystallization. The crystals remaining on the separation filter box 13 are the crystallized ferrous sulfate crystals, which can be removed. Simultaneously, the rotation of the annular tube 5 also completes the washing process. Because the annular washing ball 4 is slidably connected to the annular tube 5, its relative movement under the rotation of the annular tube washes the annular tube 5, preventing the crystals from sticking together and becoming difficult to remove.

[0029] As attached Figure 2 As shown: the annular tube 5 includes a first layer tube 53, a second layer tube 51 and a circular material 52. The second layer tube 51 surrounds the first layer tube 53 and leaves a certain space in the middle. The sealing between the first layer tube 51 and the second layer tube 52 is good. The second layer tube 51 is provided with a number of circular materials 52. The circular materials 52 are circular materials that are elastically deformable and relatively strong.

[0030] During operation, the first tube 53 of the annular tube 5 is filled with refrigerant. There is a good seal between the second tube 51 and the first tube 53. After the refrigerant enters, the air pressure between the second tube 51 and the first tube 53 is reduced due to the cooling. The circular material 52 has the characteristic of elastic deformation. Under the influence of pressure change, the annular tube 5 produces many concave dots, which are the manifestations of the deformation of the circular material 52. At this time, the concave dots can help cool the crystals, increase the crystal adhesion area, and improve the crystallization rate. After crystallization, after the refrigerant is discharged, the air pressure between the first tube 53 and the second tube 51 returns to normal as the temperature rises. The concave dots produced by the circular material 52 disappear, and the circular material 52 becomes flat, which helps the crystals fall off and eliminates the adhesion of the crystals.

[0031] The above description is merely an example of the invention itself; common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this invention, and these should also be considered within the scope of protection of this invention. These modifications will not affect the effectiveness of the invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A crystallization apparatus for ferrous sulfate, comprising a crystallization tank, a separator, a drive mechanism, and a recovery mechanism, wherein the crystallization tank includes a raw liquid inlet pipe, a refrigerant inlet pipe, a refrigerant outlet pipe, and an outlet pipe, the outlet pipe being connected to the separator, the separator being connected to the recovery mechanism, and the recovery mechanism being connected to the raw liquid inlet pipe, characterized in that, It also includes an annular tube and a cleaning mechanism. One end of the annular tube is connected to the refrigerant inlet via a rotary joint, and the other end is connected to the refrigerant outlet via a rotary joint. The annular tube is mounted on a drive mechanism and is rotatably mounted inside a crystallization tank. The cleaning mechanism includes a connecting rod, a stepped rod, and an annular scrubbing ball. The stepped rod is hollow and slidably connected to the connecting rod. The annular scrubbing ball is fixedly connected to the stepped rod and slidably connected to the annular tube. An outer tube is also provided outside the annular tube, with gas between the two tubes. The outer tube has evenly distributed holes, and elastic material is placed on the holes. The outer tube is a one-piece molded tube. When the refrigerant enters the annular tube, the air pressure decreases due to the cold. The surface elastic material deforms due to the pressure change between the first and second tubes. As the pressure decreases, it dents inward, creating concave dots on the surface of the annular tube. After the refrigerant is released, the temperature rises, the pressure inside the annular tube returns to normal, and the concave dots return to their flat state.

2. The ferrous sulfate crystallization apparatus according to claim 1, characterized in that: The drive mechanism includes a motor, a drive gear, a driven gear, and a solenoid valve assembly. The motor is connected to the drive gear, and the drive gear and the driven gear mesh. The driven gear is coaxially connected to the annular tube and is located at the inlet of the annular tube. The solenoid valve assembly is fixedly connected to the annular tube and is located at the inlet and outlet of the annular tube, respectively.

3. The ferrous sulfate crystallization apparatus according to claim 1, characterized in that: The cleaning mechanism also includes T-shaped rods, which are fixedly connected in groups to the inner wall of the crystallization tank, and the T-shaped tubes are slidably connected to the connecting rods.

4. The ferrous sulfate crystallization apparatus according to claim 1, characterized in that: The separator includes a main separator housing and a separation filter housing. The main separator housing is equipped with a limit block and a discharge port baffle. The limit block is located on the inner wall of the main separator housing, and the discharge port baffle is rotatably connected to the main separator housing.

5. The ferrous sulfate crystallization apparatus according to claim 1, characterized in that: The annular scrubbing ball includes an annular ring and a metal wire mesh, with the metal wire mesh fixedly wound around the annular ring.

6. The ferrous sulfate crystallization apparatus according to claim 1, characterized in that: The recycling mechanism includes a recycling pipeline and a pump. One end of the recycling pipeline is connected to the lower part of the separator, and the other end of the recycling pipeline is connected to the raw liquid inlet. A pump is installed on the recycling pipeline.

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