Device for pretreating ardealite with magnesium hydroxide and use method thereof

Abstract

The invention discloses a device and a method for pretreating ardealite with magnesium hydroxide, and relates to the technical field of ardealite treatment. Comprising a tank body, a plurality of supporting legs, a discharging pipe, a feeding pipe, a shell, a hollow shaft, a stirring and mixing assembly, a driving assembly, a liquid storage tank, a PH meter, a reciprocating motion assembly and a lifting plate; the discharging pipe and the supporting legs are fixedly installed at the bottom of the tank body, the feeding pipe and the shell are fixedly installed at the top of the tank body, the discharging pipe and the feeding pipe are communicated with the tank body, the hollow shaft is rotatably installed in the tank body, and the driving assembly is arranged at the top of the tank body and located in the shell. The method is reasonable in design, the reaction rate can be increased, the uniformity and the quality stability of the product can be ensured, the production cost and the energy consumption can be reduced, efficient pretreatment of the phosphogypsum is realized, and a solid foundation is laid for large-scale comprehensive utilization of the phosphogypsum.

Description

Technical Field

[0001] The present invention relates to the technical field of phosphogypsum treatment, and in particular to a device for pretreating phosphogypsum with magnesium hydroxide and a method for using the same. Background Art

[0002] In the field of phosphogypsum pretreatment, efficient and environmentally friendly treatment technologies have always been the focus of research. Phosphogypsum, as a large industrial by-product in the production process of wet-process phosphoric acid, has a huge output and complex composition. Traditional phosphogypsum contains unreacted phosphorus, fluorine and other impurities as well as acidic substances, which not only pose potential hazards to the environment, but also face many limitations in its direct utilization. For example, it will affect the product performance in the application of building materials.

[0003] In the past, conventional methods such as water washing and neutralization were often used for the treatment of phosphogypsum. Water washing can remove some soluble impurities, but the effect of deep purification is limited, and the water consumption is large, which is easy to produce a large amount of sewage. Neutralization treatment mostly uses alkaline substances such as lime. Although it can adjust the pH value to a certain extent, there are problems such as low reaction efficiency and poor product uniformity. In terms of stirring and mixing, the structure of traditional stirring devices is simple, and the stirring effect is not good, and it is impossible to achieve efficient liquid-solid mixing, resulting in a slow reaction rate and affecting the production efficiency. At the same time, the monitoring and control of the pH value during the reaction are not accurate and convenient enough, and it is difficult to adjust the treatment parameters in real time according to the reaction conditions, which makes it difficult to guarantee the quality stability of the products after phosphogypsum pretreatment.

[0004] With the continuous improvement of the requirements for comprehensive utilization of resources and environmental protection in industrial development, the existing phosphogypsum pretreatment technologies are increasingly difficult to meet the needs. Therefore, it is becoming more and more important to study a device for pretreating phosphogypsum with magnesium hydroxide and a method for using the same. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a device for pretreating phosphogypsum with magnesium hydroxide and a method for using the same, so as to improve the reaction efficiency of phosphogypsum pretreatment and ensure the quality stability of the products after phosphogypsum pretreatment.

[0006] In order to achieve the above object of the invention, a device for pretreating phosphogypsum with magnesium hydroxide of the present invention includes a tank body, a plurality of support legs, a discharge pipe, a feed pipe, a housing, a hollow shaft, a stirring and mixing assembly, a driving assembly, a liquid storage tank, a pH meter, a reciprocating motion assembly and a lifting plate; The discharge pipe and multiple support legs are both fixedly installed at the bottom of the tank body. The feed pipe and the housing are both fixedly installed at the top of the tank body, and the discharge pipe and the feed pipe are both communicated with the tank body. The hollow shaft is rotatably installed in the tank body. The driving assembly is arranged at the top of the tank body and located inside the housing, and the driving assembly is connected to the hollow shaft. The stirring and mixing assembly is arranged on the hollow shaft. The liquid storage tank is fixedly installed at the top of the housing. A delivery pipe that is hermetically and rotatably connected to the hollow shaft is fixedly installed on the liquid storage tank, and a metering valve is fixedly installed on the delivery pipe. The pH meter is arranged on the housing, the tank body and the delivery pipe and is adapted to the hollow shaft. The lifting plate is arranged above the housing and is connected to the pH meter. The reciprocating motion assembly is arranged on the housing and is connected to the driving assembly and the lifting plate.

[0007] Preferably, the stirring and mixing assembly includes two support rods, a first spiral blade and a second spiral blade. Two support rods are radially fixedly installed on the hollow shaft, and the first spiral blade and the second spiral blade that are arranged centered on the hollow shaft are fixedly installed on the two support rods.

[0008] Preferably, the spiral directions of the first spiral blade and the second spiral blade are opposite.

[0009] Preferably, a plurality of stirring rods are fixedly installed on the inner side wall of the tank body, and a plurality of hollow rods that are communicated with the hollow shaft are fixedly installed on the hollow shaft.

[0010] Preferably, the driving assembly includes a driving motor, a driving gear and a driven gear. The driving motor is fixedly installed at the top of the tank body. A driving gear and a driven gear are respectively fixedly sleeved on the output shaft of the driving motor and the hollow shaft, and the driving gear and the driven gear are meshed with each other.

[0011] Preferably, the pH meter includes a transmitter, a transmission line and an electrode rod. The electrode rod is hermetically and slidably installed on the delivery pipe. The electrode rod is fixedly connected to the lifting plate. The bottom end of the electrode rod extends into the hollow shaft. The transmitter is fixedly installed at the top of the tank body. A transmission line that is connected to the electrode rod is connected to the transmitter, and a fixing block that is connected to the transmission line is fixedly installed on the support frame.

[0012] Preferably, the reciprocating motion assembly includes a reciprocating lead screw and a nut sleeve. The reciprocating lead screw is rotatably installed on the housing. The nut sleeve is fixedly installed on the lifting plate, and the nut sleeve is threadedly sleeved on the reciprocating lead screw.

[0013] Preferably, the reciprocating assembly further includes a transmission gear. The transmission gear is fixedly sleeved on the reciprocating lead screw, and the transmission gear is meshed with the driven gear.

[0014] Preferably, a support frame is fixedly installed at the top of the housing, and the lifting plate is slidably connected to the support frame along the axial direction of the hollow shaft.

[0015] Preferably, an observation window I is provided on the tank body, and an observation window II is provided on the liquid storage tank, and both the observation window I and the observation window II are strip-shaped.

[0016] The present invention also provides a method for using a device for pretreating phosphogypsum with magnesium hydroxide, comprising the following steps: S1: Select a suitable phosphogypsum raw material, crush it to a suitable reaction particle size, and add it into the tank body from the feed pipe. At the same time, add water into the tank body through the feed pipe according to a solid-liquid ratio of 1:1 or 2:1. At the same time, pour a high-purity magnesium hydroxide solution into the liquid storage tank, and control the hollow shaft to drive the stirring and mixing assembly to cooperate with the stirring rod and the hollow rod to perform stirring and mixing operations through the driving assembly, so as to realize rapid pulping. S2: Inject the magnesium hydroxide solution into the hollow shaft through the metering valve and the conveying pipe to react with the phosphogypsum slurry. Due to the setting of the stirring and mixing assembly, the hollow rod and the stirring rod, rapid stirring and mixing can be realized, so as to effectively improve the mixing uniformity and accelerate the reaction rate. S3: When the hollow shaft rotates driven by the driving assembly, the reciprocating motion assembly can cooperate to control the lifting plate to drive the electrode rod to reciprocate up and down, so as to continuously adjust the depth of the electrode rod extending into the solution and achieve the effect of real-time monitoring of the PH value. At the same time, the PH value is processed and displayed by the transmitter through the transmission line, guiding the operator to decide whether to continue cleaning. After meeting the requirements, take out and dry the phosphogypsum solid.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) Through the setting of the driving motor, driving gear, driven gear, hollow shaft, support rod, spiral blade I and spiral blade II, the driving motor can drive the hollow shaft to rotate through the driving gear and the driven gear, so as to drive the spiral blade I and the spiral blade II on the support rod to rotate. Since the spiral directions of the spiral blade I and the spiral blade II are opposite, the mixed liquid in the tank body can be turbulently flowed and stirred when the hollow shaft rotates, effectively improving the stirring rate of the mixed liquid and enabling it to react better and faster.

[0018] (2) Through the setting of the liquid storage tank, conveying pipe, metering valve, hollow shaft, hollow rod and PH meter, according to the PH value of the liquid required after the mixed liquid is mixed and reacted, an appropriate amount of magnesium hydroxide solution can be injected into the hollow shaft through the metering valve and the conveying pipe. These magnesium hydroxide solutions will be injected into the tank body through the lower port of the hollow shaft and multiple hollow rods, so as to realize a rapid reaction between the magnesium hydroxide solution and the phosphogypsum slurry. At the same time, while the hollow shaft rotates, control multiple hollow rods to cooperate with the stirring rods fixed on the inner wall of the tank body for auxiliary stirring, which can further improve the mixing uniformity of the magnesium hydroxide solution and the phosphogypsum in the tank body, and further improve the reaction rate of the magnesium hydroxide solution and the phosphogypsum.

[0019] (3) By means of the reciprocating lead screw, nut sleeve, lifting plate, transmission gear, electrode rod and transmitter provided, during the rotation of the hollow shaft, the transmission gear can be driven by the driven gear to make the reciprocating lead screw rotate. Thus, under the cooperation of the nut sleeve, the lifting plate can be controlled to reciprocate up and down, and then the depth of the electrode rod extending into the solution in the tank can be continuously adjusted, and its pH value can be monitored in real time. The data detected by the electrode rod is transmitted to the transmitter through the transmission line, and the transmitter processes it and displays the real-time monitored pH value data, which is convenient for the operator to determine whether to continue cleaning according to the read pH value. The operation is simple and the work efficiency is greatly improved.

[0020] In summary, the present invention realizes the efficient pretreatment of phosphogypsum and magnesium hydroxide, not only improves the reaction rate, but also ensures the uniformity and quality stability of the reaction products. In addition, the device is reasonably designed, has a compact structure, is easy to operate and maintain, greatly reduces the production cost and energy consumption, and provides strong technical support for the comprehensive utilization of phosphogypsum. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0022] Figure 2 It is a first sectional structural schematic diagram of the present invention.

[0023] Figure 3 It is a second sectional structural schematic diagram of the present invention.

[0024] Figure 4 It is a partial three-dimensional structural schematic diagram of the present invention.

[0025] Figure 5 It is a structural schematic diagram of the hollow shaft, hollow rod, stirring and mixing assembly and driven gear part of the present invention.

[0026] Figure 6 It is a structural schematic diagram of the housing and support frame part of the present invention.

[0027] In the figure: 1, tank; 101, support leg; 11, discharge pipe; 111, discharge valve; 12, feed pipe; 13, housing; 131, support frame; 14, first observation window; 2, hollow shaft; 21, hollow rod; 22, support rod; 23, first spiral blade; 24, second spiral blade; 3, drive motor; 31, drive gear; 32, driven gear; 4, liquid storage tank; 401, second observation window; 41, delivery pipe; 42, metering valve; 5, pH meter; 51, transmitter; 52, electrode rod; 53, transmission line; 531, fixing block; 6, lifting plate; 61, reciprocating lead screw; 611, nut sleeve; 62, transmission gear; 7, stirring rod. DETAILED DESCRIPTION OF THE INVENTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0030] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 shown, a device for pretreating phosphogypsum with magnesium hydroxide according to the present invention mainly includes a tank body 1, a plurality of support legs 101, a discharge pipe 11, a feed pipe 12, a housing 13, a hollow shaft 2, a liquid storage tank 4 and a lifting plate 6. The discharge pipe 11 and the plurality of support legs 101 are both fixedly installed at the bottom of the tank body 1, and the feed pipe 12 and the housing 13 are both fixedly installed at the top of the tank body 1, and both the discharge pipe 11 and the feed pipe 12 are communicated with the tank body 1.

[0031] The hollow shaft 2 is rotatably installed in the tank body 1. A driving motor 3 is fixedly installed at the top of the tank body 1. A driving gear 31 and a driven gear 32 are respectively fixedly sleeved on the output shaft of the driving motor 3 and the hollow shaft 2. The driving gear 31 and the driven gear 32 are meshed with each other, which can provide driving force for the hollow shaft 2. Two support rods 22 are radially fixedly installed on the hollow shaft 2. A first spiral blade 23 and a second spiral blade 24 are fixedly installed on the two support rods 22 and are arranged centered on the hollow shaft 2, which can perform turbulence and stirring operations on the mixed liquid in the tank body 1 when the hollow shaft 2 rotates. Among them, in order to improve the mixing rate of the mixed liquid in the tank body 1 so that it can react better and faster, the spiral directions of the first spiral blade 23 and the second spiral blade 24 are opposite.

[0032] The liquid storage tank 4 is fixedly installed on the top of the housing 13. A delivery pipe 41 that is hermetically and rotationally connected to the hollow shaft 2 is fixedly installed on the liquid storage tank 4. A metering valve 42 is fixedly installed on the delivery pipe 41. The lifting plate 6 is arranged above the housing 13. The pH meter 5 includes a transmitter 51, a transmission line 53, and an electrode rod 52. The electrode rod 52 is hermetically and slidably installed on the delivery pipe 41. The electrode rod 52 is fixedly connected to the lifting plate 6. The bottom end of the electrode rod 52 extends into the hollow shaft 2. The transmitter 51 is fixedly installed on the top of the tank body 1. The transmission line 53 connected to the transmitter 51 is connected to the electrode rod 52. A fixing block 531 connected to the transmission line 53 is fixedly installed on the support frame 131, which can detect the pH value of the solution in the tank body 1.

[0033] A reciprocating lead screw 61 is rotatably installed on the housing 13. A screw sleeve 611 is fixedly installed on the lifting plate 6. The screw sleeve 611 is threadedly sleeved on the reciprocating lead screw 61. When the reciprocating lead screw 61 rotates, it can control the lifting plate 6 to drive the electrode rod 52 to move up and down reciprocally, so as to be able to monitor the pH value of the solution at different depth positions in the tank body 1 in real time. A transmission gear 62 is fixedly sleeved on the reciprocating lead screw 61. The transmission gear 62 meshes with the driven gear 32. When the drive motor 3 controls the hollow shaft 2 to rotate, it can drive the reciprocating lead screw 61 to rotate.

[0034] In this embodiment, in order to be able to cooperate with the spiral blade one 23 and the spiral blade two 24 to realize the auxiliary stirring operation, a plurality of stirring rods 7 are fixedly installed on the inner side wall of the tank body 1. A plurality of hollow rods 21 communicated with the hollow shaft 2 are fixedly installed on the hollow shaft 2.

[0035] In this embodiment, in order to ensure that the lifting plate 6 can achieve stable reciprocating movement under the action of the reciprocating lead screw 61, a support frame 131 is fixedly installed on the top of the housing 13. The lifting plate 6 is slidably connected to the support frame 131 along the axial direction of the hollow shaft 2.

[0036] In this embodiment, in order to facilitate the operator to understand the water level heights in the tank body 1 and the liquid storage tank 4 in real time, a first observation window 14 and a second observation window 401 are respectively arranged on the tank body 1 and the liquid storage tank 4. Both the first observation window 14 and the second observation window 401 are arranged in a strip shape.

[0037] This embodiment also provides a usage method of a device for pretreating phosphogypsum with magnesium hydroxide, including the following steps: S1: Select appropriate phosphogypsum raw materials and crush them to a particle size convenient for reaction with magnesium hydroxide, and add them into the tank body 1 through the feed pipe 12. At the same time, add water into the tank body 1 through the feed pipe 12 according to a solid-liquid ratio of 2:1. Then, pour magnesium hydroxide solution with a purity of more than 90% into the liquid storage tank 4. Start the driving motor 3. The driving motor 3 controls the movement of the hollow shaft 2 through the driving gear 31 and the driven gear 32, so as to control the support rod 22 to drive the first spiral blade 23 and the second spiral blade 24 to rotate and stir the phosphogypsum and water. Since the spiral directions of the first spiral blade 23 and the second spiral blade 24 are opposite, rapid pulping can be achieved; S2: Then, inject an appropriate amount of magnesium hydroxide solution into the hollow shaft 2 through the quantitative valve 42 and the delivery pipe 41. These magnesium hydroxide solutions will be injected into the tank body 1 through the lower port of the hollow shaft 2 and the multiple hollow rods 21, enabling a rapid reaction between the magnesium hydroxide solution and the phosphogypsum slurry. At the same time, while the hollow shaft 2 is rotating, control the multiple hollow rods 21 to cooperate with the stirring rods 7 fixed on the inner wall of the tank body 1 for auxiliary stirring, so as to further improve the mixing uniformity of the magnesium hydroxide solution and the phosphogypsum in the tank body 1, and further improve the reaction rate between the magnesium hydroxide solution and the phosphogypsum; S3: During the rotation of the hollow shaft 2, drive the transmission gear 62 through the driven gear 32 to make the reciprocating lead screw 61 rotate, so as to control the lifting plate 6 to reciprocate up and down under the cooperation of the nut sleeve 611, and further continuously adjust the depth of the electrode rod 52 extending into the solution in the tank body 1 and monitor its pH value in real time. The data detected by the electrode rod 52 is transmitted to the transmitter 51 through the transmission line 53, and is processed by the transmitter 51 and the real-time monitored pH value data is displayed, which is convenient for the operator to determine whether to continue cleaning according to the read pH value. If the pH value requirement is met, the treated phosphogypsum solid is taken out and dried.

[0038] Among them, the diameter of the transmission gear 62 is larger than that of the driven gear 32, aiming to achieve a deceleration effect during transmission to avoid the situation that the electrode rod 52 reciprocates up and down too fast.

[0039] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here.

[0040] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. An apparatus for pretreating phosphogypsum with magnesium hydroxide, characterized in that: It includes a tank body (1), a plurality of support legs (101), a discharge pipe (11), a feed pipe (12), a housing (13), a hollow shaft (2), a stirring and mixing assembly, a driving assembly, a liquid storage tank (4), a pH meter (5), a reciprocating motion assembly and a lifting plate (6); The discharge pipe (11) and the plurality of support legs (101) are both fixedly installed at the bottom of the tank body (1), the feed pipe (12) and the housing (13) are both fixedly installed at the top of the tank body (1), and the discharge pipe (11) and the feed pipe (12) are both communicated with the tank body (1). The hollow shaft (2) is rotatably installed in the tank body (1). The driving assembly is arranged at the top of the tank body (1) and inside the housing (13), and the driving assembly is connected to the hollow shaft (2). The stirring and mixing assembly is arranged on the hollow shaft (2). The liquid storage tank (4) is fixedly installed at the top of the housing (13). A delivery pipe (41) which is hermetically and rotatably connected to the hollow shaft (2) is fixedly installed on the liquid storage tank (4), and a metering valve (42) is fixedly installed on the delivery pipe (41). The pH meter (5) is arranged on the housing (13), the tank body (1) and the delivery pipe (41) and is adapted to the hollow shaft (2). The lifting plate (6) is arranged above the housing (13) and is connected to the pH meter (5). The reciprocating motion assembly is arranged on the housing (13) and is connected to the driving assembly and the lifting plate (6); Observation windows I (14) and II (401) are respectively arranged on the tank body (1) and the liquid storage tank (4), and both the observation window I (14) and the observation window II (401) are arranged in a strip shape.

2. The device for pretreating phosphogypsum with magnesium hydroxide according to claim 1, characterized in that: The stirring and mixing assembly includes two support rods (22), a first spiral blade (23) and a second spiral blade (24). Two support rods (22) are radially and fixedly installed on the hollow shaft (2), and the first spiral blade (23) and the second spiral blade (24) which are arranged centered on the hollow shaft (2) are fixedly installed on the two support rods (22).

3. An apparatus for pretreating phosphogypsum with magnesium hydroxide according to claim 2, characterized in that: The spiral directions of the first spiral blade (23) and the second spiral blade (24) are opposite.

4. The device for pretreating phosphogypsum with magnesium hydroxide according to claim 1, characterized in that: A plurality of stirring rods (7) are fixedly installed on the inner side wall of the tank body (1), and a plurality of hollow rods (21) which are communicated with the hollow shaft (2) are fixedly installed on the hollow shaft (2).

5. The device for pretreating phosphogypsum with magnesium hydroxide according to claim 1, characterized in that: The driving assembly includes a driving motor (3), a driving gear (31) and a driven gear (32). The driving motor (3) is fixedly installed at the top of the tank body (1). A driving gear (31) and a driven gear (32) are respectively fixedly sleeved on the output shaft of the driving motor (3) and the hollow shaft (2), and the driving gear (31) and the driven gear (32) are meshed with each other.

6. The device for pretreating phosphogypsum with magnesium hydroxide according to claim 1, characterized in that: The pH meter (5) includes a transmitter (51), a transmission line (53) and an electrode rod (52). The electrode rod (52) is sealed and slidably mounted on the delivery pipe (41). The electrode rod (52) is fixedly connected to the lifting plate (6). The bottom end of the electrode rod (52) extends into the hollow shaft (2). The transmitter (51) is fixedly mounted on the top of the tank body (1). A transmission line (53) connected to the electrode rod (52) is connected to the transmitter (51). And a fixing block (531) connected to the transmission line (53) is fixedly mounted on the support frame (131).

7. The device for pretreating phosphogypsum with magnesium hydroxide according to claim 1, characterized in that: The reciprocating motion assembly includes a reciprocating lead screw (61) and a screw sleeve (611). The reciprocating lead screw (61) is rotatably mounted on the housing (13). The screw sleeve (611) is fixedly mounted on the lifting plate (6). The screw sleeve (611) is threadedly sleeved on the reciprocating lead screw (61).

8. An apparatus for pretreating phosphogypsum with magnesium hydroxide according to claim 1, characterized in that: The reciprocating assembly further includes a transmission gear (62). The transmission gear (62) is fixedly sleeved on the reciprocating lead screw (61). The transmission gear (62) meshes with the driven gear (32).

9. The device for pretreating phosphogypsum with magnesium hydroxide according to claim 1, wherein: The support frame (131) is fixedly mounted on the top of the housing (13). The lifting plate (6) is slidably connected to the support frame (131) along the axial direction of the hollow shaft (2).

10. A method for using an apparatus for pretreating phosphogypsum with magnesium hydroxide according to any one of claims 1 to 9, characterized in that: It includes the following steps: S1: Select appropriate phosphogypsum raw materials, crush them to a suitable reaction particle size, and add them into the tank body (1) from the feed pipe (12). At the same time, water is added into the tank body (1) through the feed pipe (12) according to a solid-liquid ratio of 1:1 or 2:

1. At the same time, a high-purity magnesium hydroxide solution is poured into the storage tank (4). The drive assembly is used to control the hollow shaft (2) to drive the stirring and mixing assembly to cooperate with the stirring rod (7) and the hollow rod (21) for stirring and mixing operations, so as to achieve rapid pulping. S2: The magnesium hydroxide solution is injected into the hollow shaft (2) through the metering valve (42) and the delivery pipe (41) to react with the phosphogypsum slurry. Due to the arrangement of the stirring and mixing assembly, the hollow rod (21) and the stirring rod (7), rapid stirring and mixing can be achieved, so that the mixing uniformity can be effectively improved and the reaction rate can be accelerated. S3: When the hollow shaft (2) rotates driven by the drive assembly, the reciprocating motion assembly can be used to control the lifting plate (6) to drive the electrode rod (52) to reciprocate up and down, so as to continuously adjust the depth of the electrode rod (52) extending into the solution and achieve the effect of real-time monitoring of the pH value. At the same time, the pH value is processed and displayed by the transmission line (53) to the transmitter (51), guiding the operator to decide whether to continue cleaning. After meeting the requirements, the dried phosphogypsum solid is taken out.

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