Calcium-magnesium desulfurization wastewater softening pretreatment device and method

Abstract

The application relates to a calcium-magnesium desulfurization wastewater softening pretreatment device and method, and belongs to the technical field of wastewater pretreatment, which comprises a base, a mixing barrel is fixedly installed on the upper surface of the base, a fixed body is fixedly installed at the upper end of the mixing barrel, a fixed column body is arranged in the mixing barrel, a rotating barrel is arranged in the fixed column body, a fixed inclined frame is fixedly installed on the inner wall of the rotating barrel, a moving mechanism is arranged in the fixed inclined frame, a pushing device is arranged in the moving mechanism, the pushing device comprises an arc-shaped pushing block, a connecting plate is rotatably installed on the upper surface of the arc-shaped pushing block, and a rotating rod is rotatably connected to the end, away from the arc-shaped pushing block, of the connecting plate; through the combined use of the power output device, the magnet and the fixed column body, the pH chemical sensor can be switched through rotation and magnetic force, so that each pH chemical sensor corresponds to each detection position, and the detection precision is ensured.

Description

Technical Field

[0001] This invention relates to the field of wastewater pretreatment technology, specifically to a pretreatment device and method for softening wastewater from calcium-magnesium desulfurization. Background Technology

[0002] The calcium-magnesium desulfurization wastewater softening pretreatment device is a specialized water treatment equipment for power plant and industrial desulfurization wastewater.

[0003] The core function of the calcium and magnesium desulfurization wastewater softening pretreatment device is to remove high concentrations of calcium and magnesium hardness ions from the wastewater, thereby providing anti-scaling protection for subsequent deep treatment processes such as membrane concentration and evaporation crystallization. It is a key part of the "zero discharge" process for desulfurization wastewater.

[0004] In the pretreatment process of calcium and magnesium desulfurization wastewater softening, it is necessary to achieve the directional precipitation and removal of calcium and magnesium ions through pH adjustment, and the accurate detection of pH value is the core of the reagent dosing control.

[0005] Most existing devices use pH chemical sensors fixedly installed inside the reaction vessel, which can only achieve single-point fixed-position detection and cannot reflect the differences in pH value distribution between the upper, middle and lower liquid layers in the vessel. This can easily lead to inaccurate detection data due to uneven mixing of the reagents, resulting in inaccurate reagent dosage, affecting the calcium and magnesium softening effect, and increasing the risk of scaling in subsequent treatment systems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a pretreatment device and method for softening desulfurization wastewater based on calcium and magnesium, which solves the problem of inaccurate detection.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a calcium-magnesium desulfurization wastewater softening pretreatment device, comprising a base, a mixing tank fixedly installed on the upper surface of the base, a fixing body fixedly installed at the upper end of the mixing tank, and a fixing column provided inside the mixing tank;

[0008] The fixed column has a rotating barrel inside, and a fixed inclined frame is fixedly installed on the inner wall of the rotating barrel. The fixed inclined frame has a moving mechanism inside, and the moving mechanism has a pushing device inside.

[0009] The pushing device includes an arc-shaped push block, a connecting plate is rotatably mounted on the upper surface of the arc-shaped push block, a rotating rod is rotatably connected to the end of the connecting plate away from the arc-shaped push block, a switching plate is rotatably connected to the end of the connecting plate away from the arc-shaped push block through the rotating rod, and the end of the switching plate away from the connecting plate is rotatably connected to the rotating rod.

[0010] The end of the switching plate away from the connecting plate is rotatably connected to a connecting cube via the rotating rod. The end of the connecting cube away from the switching plate is rotatably connected to a guide post. A pH chemical sensor is fixedly connected to the lower end of the guide post. Rotating shafts are rotatably installed on opposite sides of the switching plate. Two symmetrically distributed sliding grooves are opened on the outer side of the guide post.

[0011] Furthermore, the moving mechanism includes a block, with an inclined block fixedly installed at the lower end of the block. The block and the inclined block are internally connected. Sliding rods are rotatably connected to opposite sides of the block. Rolling elements are rotatably installed on the outer surface of the sliding rods. A telescopic rod and a spring are fixedly installed at one end of the block. The spring is sleeved on the outside of the telescopic rod. The opposite ends of the rotating shaft are rotatably connected to the inner wall of the block. Two symmetrically distributed limiting sliders are fixedly installed inside the block. The limiting sliders are slidably connected to the inner wall of the groove.

[0012] Furthermore, there are three fixed inclined frames arranged in a circular array. Sliding grooves are provided on opposite sides of the fixed inclined frames. The sliding grooves are inclined, and a pushing block is fixedly installed at the bottom of the sliding groove.

[0013] Furthermore, the telescopic rod and the end of the spring away from the block are fixedly connected to the inner wall of the fixed inclined frame, and the circumference of the rolling element is slidably connected to the inner wall of the sliding groove.

[0014] Furthermore, a connecting plate is fixedly installed on the upper end of the rotating barrel, and a power output device is fixedly connected to the end of the connecting plate away from the rotating barrel. The end of the power output device away from the connecting plate extends to the outside of the fixed column.

[0015] Furthermore, the fixed column has an internal running cavity, and a magnet is fixedly installed on the surface of the running cavity. The magnet slides and fits against the outer arc surface of the rotating barrel, and the height of the magnet corresponds to the height of the fixed inclined frame.

[0016] Furthermore, a through hole is provided in the middle of the lower end of the fixed column, and a channel is fixedly installed in the middle of the lower end of the fixed column. The channel is connected to the through hole and the interior of the running cavity.

[0017] Furthermore, the center points of the three fixed oblique frames at opposite ends are perpendicular to the perforation and the channel, and the diameter of the perforation and the channel is larger than the diameter of the pH chemical sensor.

[0018] Furthermore, the end of the power output device away from the fixed column is fixedly connected to the inner wall of the fixed body. There are three fixed bodies, and a control box is fixedly installed on the upper surface of the base.

[0019] The calcium-magnesium desulfurization wastewater softening pretreatment method includes the following steps:

[0020] Step 1: Adjust pH value: Add the reagent into the mixing tank, and use the motor at the top of the mixing tank to stir and mix the contents.

[0021] Step 2: Detection and positioning: The power output device operates, the fixed column moves downward, and the power output device drives the fixed column to stop at the bottom, middle and top of the mixing tank respectively;

[0022] Step 3: Testing: The magnetic repulsion pushes the square block and the inclined block to move. The pushing block enters the interior of the inclined block, and the pushing block pushes the arc-shaped push block. The arc-shaped push block moves upward, the switching plate rotates, the guide column moves downward, and the pH chemical sensor moves to the outside of the fixed column for testing.

[0023] Step 4: pH chemical sensor switching: The magnet rotates away from the inclined block and square block, the spring returns to its original position and contracts, the push block moves away from the inclined block, the arc-shaped push block moves downward, the switching plate rotates, the guide column moves upward, the pH chemical sensor moves to the inside of the fixed column, the magnet continues to move to the next inclined block and square block, and the next pH chemical sensor moves to the outside of the fixed column again.

[0024] Compared with the prior art, the present invention provides a pretreatment device and method for softening desulfurization wastewater based on calcium and magnesium, which has the following beneficial effects:

[0025] 1. By combining a power output device, a magnet, and a fixed column, this invention enables the pH chemical sensor to be switched via rotation and magnetic force, thereby ensuring that each pH chemical sensor corresponds to each detection position and guaranteeing accurate detection.

[0026] 2. By setting up a moving mechanism, the present invention can drive the pH chemical sensor to move through the repulsive force of the magnet, avoiding the collision and damage caused by the disorderly movement of multiple pH chemical sensors. At the same time, it can accurately drive the pH chemical sensor to switch detection, thereby ensuring the accuracy of detection.

[0027] 3. By setting up a pushing device, the present invention can push out and pull back the pH chemical sensor, ensuring the stable use and switching of the pH chemical sensor, and ensuring the detection accuracy of the pH chemical sensor. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the rear view structure of the present invention;

[0030] Figure 3 This is a schematic cross-sectional view of the mixing tank of the present invention;

[0031] Figure 4 This is a schematic diagram of the cross-sectional structure of the fixing body of the present invention;

[0032] Figure 5 This is a schematic diagram of the cross-sectional structure of the fixed column of the present invention;

[0033] Figure 6 This is a bottom view of the rotating barrel structure of the present invention;

[0034] Figure 7 This is a schematic diagram of the cross-sectional structure of the rotating barrel of the present invention;

[0035] Figure 8 This is a schematic diagram of the pH chemical sensor structure of the present invention;

[0036] Figure 9 This is a schematic diagram of the cross-sectional structure of the pH chemical sensor of the present invention;

[0037] Figure 10 This is a schematic diagram of the cross-sectional structure of the fixed inclined frame of the present invention;

[0038] Figure 11 This is a schematic diagram of the block cross-sectional structure of the present invention;

[0039] Figure 12 This is a schematic diagram of the arc-shaped pusher structure of the present invention.

[0040] In the diagram: 1. Base; 2. Mixing tank; 3. Fixture; 4. Control box;

[0041] 5. Power take-off device; 51. Connecting plate; 52. Magnet;

[0042] 6. Fixed column; 61. Perforation; 62. Channel; 63. Running chamber;

[0043] 7. Rotating barrel; 71. Fixed inclined frame; 711. Sliding groove; 712. Push block;

[0044] 9. pH chemical sensor;

[0045] 10. Moving mechanism; 101. Block; 102. Inclined block; 103. Spring; 104. Telescopic rod; 105. Slide rod; 106. Rolling element;

[0046] 11. Pushing device; 110. Arc-shaped push block; 111. Connecting plate; 112. Switching plate; 113. Rotating shaft; 114. Rotating rod; 115. Connecting cube; 116. Guide column; 117. Slide groove; 118. Limiting slider. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Please see Figures 1 to 12 The calcium-magnesium desulfurization wastewater softening pretreatment device in this embodiment includes a base 1. A control box 4 is fixedly installed on the upper surface of the base 1. The control box 4 is used to control the operation of a power output device 5, which consists of an electric telescopic rod and an electric drum. The electric telescopic rod enables the fixed column 6 to move up and down, and the electric drum enables the rotating drum 7 to rotate. The electric drum is located inside the fixed column 6. One end of the electric telescopic rod is fixedly connected to the inside of the fixed column 6. A mixing tank 2 is fixedly installed on the upper surface of the base 1. A fixed body 3 is fixedly installed on the upper end of the mixing tank 2. A motor is installed on the upper end of the mixing tank 2 for mixing and stirring the wastewater after adding the reagent. The stirring device does not affect the use of the pH chemical sensor 9. After mixing, the wastewater is then further treated. pH value detection: Fixing body 3 is used to fix and protect the control power output device 5 and to provide space for the control power output device 5 to connect with the control box 4. There are three fixing bodies 3. The mixing tank 2 is equipped with a fixing column 6. A through hole 61 is opened through the middle of the lower end of the fixing column 6. A channel 62 is fixedly installed in the middle of the lower end of the fixing column 6. Several valves are fixedly installed inside the channel 62. The valves can prevent external solutions from entering the interior of the fixing column 6. The channel 62 is connected to the through hole 61 and the interior of the running chamber 63. The diameter of the through hole 61 and the channel 62 is larger than the diameter of the pH chemical sensor 9. Therefore, when the pH chemical sensor 9 rises and retracts, the pH chemical sensor 9 has enough space to move and rise, avoiding damage to the pH chemical sensor 9 by collision.

[0049] The fixed column 6 has a rotating barrel 7 inside, and a running cavity 63 is opened inside the fixed column 6. A magnet 52 is fixedly installed on the surface of the running cavity 63. The magnet 52 slides against the outer arc surface of the rotating barrel 7. When the rotating barrel 7 rotates, the magnet 52 can slide on the surface of the rotating barrel 7. The height of the magnet 52 corresponds to the height of the fixed inclined frame 71. Therefore, each time it rotates, the magnet 52 can correspond to one of the fixed inclined frames 71. A connecting plate 51 is fixedly installed on the upper end of the rotating barrel 7. A power output device 5 is fixedly connected to the end of the connecting plate 51 away from the rotating barrel 7. The end of the power output device 5 away from the fixed column 6 is fixedly connected to the inner wall of the fixed body 3.

[0050] The power output device 5 extends to the outside of the fixed column 6 at the end away from the connecting plate 51. A fixed inclined frame 71 is fixedly installed on the inner wall of the rotating barrel 7. There are three fixed inclined frames 71, which are arranged in a circular array. The center point of the opposite end of the three fixed inclined frames 71 is perpendicular to the perforation 61 and the channel 62. The center point formed by the opposite end of the three fixed inclined frames 71 is perpendicular to the center point of the perforation 61 and the channel 62, thereby ensuring the accurate operation of the pH chemical sensor 9. Sliding grooves 711 are opened on opposite sides of the fixed inclined frame 71. The sliding grooves 711 are inclined, and a push block 712 is fixedly installed at the bottom of the sliding groove 711. One end of the push block 712 is provided with an inclined surface, which is adapted to the arc shape of the bottom of the arc-shaped push block 110. A moving mechanism 10 is provided inside the fixed inclined frame 71. The moving mechanism 10 includes a block 101. Two symmetrically distributed limit sliders 118 are fixedly installed inside the block 101. The limit sliders 118 are slidably connected to the inner wall of the sliding groove 117.

[0051] A telescopic rod 104 and a spring 103 are fixedly installed at one end of a block 101. The elasticity of the spring 103 is less than the repulsive force of the magnet 52. The ends of the telescopic rod 104 and the spring 103 away from the block 101 are fixedly connected to the inner wall of the fixed inclined frame 71. The spring 103 is sleeved on the outside of the telescopic rod 104. An inclined block 102 is fixedly installed at the lower end of the block 101. The blocks 101 and the inclined block 102 are internally connected. The blocks 101 and the inclined block 102 are made of magnetic material, and their magnetic poles are the same as those of the magnet 52. Sliding rods 105 are rotatably connected to opposite sides of the block 101. Rolling elements 106 are rotatably installed on the outer surface of the sliding rods 105. The rolling elements 106 rotate around... The side is slidably connected to the inner wall of the sliding groove 711. When the block 101 and the inclined block 102 move, the rolling body 106 can slide and rotate inside the sliding groove 711, thereby reducing friction. The moving mechanism 10 is provided with a pushing device 11. The pushing device 11 includes an arc-shaped push block 110. A connecting plate 111 is rotatably mounted on the upper surface of the arc-shaped push block 110. A rotating rod 114 is rotatably connected to the end of the connecting plate 111 away from the arc-shaped push block 110. The weight of the arc-shaped push block 110 is greater than the weight of the pH chemical sensor 9. Therefore, when the pH chemical sensor 9 is retracted, the weight of the arc-shaped push block 110 can retract the pH chemical sensor 9.

[0052] A switching plate 112 is rotatably connected to the end of the connecting plate 111 away from the arc-shaped push block 110 via a rotating rod 114. The end of the switching plate 112 away from the connecting plate 111 is rotatably connected to the rotating rod 114. A connecting cube 115 is rotatably connected to the end of the switching plate 112 away from the connecting plate 111 via the rotating rod 114. A guide post 116 is rotatably connected to the end of the connecting cube 115 away from the switching plate 112. A pH chemical sensor 9 is fixedly connected to the lower end of the guide post 116. Rotating shafts 113 are rotatably installed on opposite sides of the switching plate 112.

[0053] The two opposite ends of the rotating shaft 113 are rotatably connected to the inner wall of the block 101, and two symmetrically distributed sliding grooves 117 are opened on the outer side of the guide post 116;

[0054] Except for the magnetic components, all other components of this device are made of austenitic non-magnetic stainless steel.

[0055] The electric telescopic rod, the electric roller, and the connection method between the electric telescopic rod, the electric roller and the control box 4, the valve, and the control box 4 are existing technologies and will not be described in detail here.

[0056] In this embodiment, the calcium-magnesium desulfurization wastewater softening pretreatment method includes the following steps:

[0057] Step 1: Adjust pH value: Add the reagent into mixing tank 2, and stir and mix the contents of mixing tank 2 by running the motor at the top of mixing tank 2;

[0058] Step 2: Detection and positioning: The power output device 5 operates, the fixed column 6 moves downward, and the power output device 5 drives the fixed column 6 to stop at the bottom, middle and top of the mixing tank 2 respectively;

[0059] Step 3: Testing: Magnet 52 repulses and pushes block 101 and inclined block 102 to move. Pushing block 712 enters the interior of inclined block 102. Pushing block 712 pushes arc-shaped push block 110. Arc-shaped push block 110 moves upward. Switching plate 112 rotates. Guide column 116 moves downward. pH chemical sensor 9 moves to the outside of fixed column 6 for testing.

[0060] Step 4: pH chemical sensor switching: Magnet 52 rotates away from inclined block 102 and square block 101, spring 103 resets and retracts, push block 712 moves away from inclined block 102, arc-shaped push block 110 moves downward, switching plate 112 rotates, guide column 116 moves upward, pH chemical sensor 9 moves to the inside of fixed column 6, magnet 52 continues to move to the next inclined block 102 and square block 101, and the next pH chemical sensor 9 moves to the outside of fixed column 6 again.

[0061] The working principle of the above embodiment is as follows: During pretreatment, the pH value of the wastewater to be treated is first adjusted. After the adjustment is qualified, calcium and magnesium precipitation can proceed. During the pH adjustment process, it is necessary to constantly monitor the pH value change to ensure the accuracy of the adjustment. When using the pH chemical sensor 9 for detection, under the control of the control box 4, the electric telescopic rod on the power output device 5 drives the fixed column 6 to move downward. At the same time, the fixed column 6 enters the wastewater. When the fixed column 6 reaches the bottom area of ​​the mixing tank 2, the control box 4 controls the electric drum to start running. At this time, the electric drum drives the rotating tank 7 to rotate. At this time, the magnet 52 slides on the outside of the rotating tank 7. When the fixed inclined frame 71 rotates to the position corresponding to the magnet 52, the magnet 52 generates a repulsive force on the square block 101 and the inclined block 102. At this time, the square block 101 and the inclined block 102 move away from the magnet 52. At the same time, the spring 103 and the telescopic rod 104 unfold, and the pH chemical sensor 9 moves with the inclined block 102. The square block 101 drives the rolling body 106 in the sliding groove 711. The internal sliding and rotating mechanism allows the cube 101 and inclined block 102 to move to the bottom of the sliding groove 711. At this time, the pushing block 712 can be inserted into the inclined block 102, and simultaneously the pushing block 712 presses against the bottom of the arc-shaped push block 110. At this time, the arc-shaped push block 110 moves upward, the connecting plate 111 moves upward, the rotating shaft 113 rotates, and the switching plate 112 rotates. At this time, the connecting cube 115 moves downward and the guide post 116 moves downward. Meanwhile, under the limit of the limiting slider 118, the guide post 116 can move downward stably. At this time, the pH chemical sensor 9 can move downwards and to the outside of channel 62 to detect the pH value of the wastewater at this location. After the detection is completed, the above operation is reversed to retract the pH chemical sensor 9. At the same time, the electric telescopic rod retracts and the fixed column 6 moves upwards. When the fixed column 6 reaches the middle position of the mixing tank 2, the above operation is repeated to complete the switching of the pH chemical sensor 9 and detect the middle of the mixing tank 2. This allows for detection of the bottom, middle, and top of the mixing tank 2, thus ensuring the accuracy of the detection.

[0062] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. Any method that can achieve its beneficial effect can be implemented. In addition, the electrical components in this embodiment are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device such as a computer that plays a control role. Those skilled in the art can control the electrical components through simple programming. Moreover, the existing disclosed power connection technology is also common knowledge in the field. Therefore, the specific structural composition and working principle will not be described in detail in this embodiment.

Claims

1. A pretreatment device for softening desulfurization wastewater based on calcium and magnesium, comprising a base (1), wherein a mixing tank (2) is fixedly installed on the upper surface of the base (1), characterized in that: A fixing body (3) is fixedly installed at the upper end of the mixing tank (2), and a fixing column (6) is provided inside the mixing tank (2). The fixed column (6) is provided with a rotating barrel (7) inside. A fixed inclined frame (71) is fixedly installed on the inner wall of the rotating barrel (7). A moving mechanism (10) is provided inside the fixed inclined frame (71). A pushing device (11) is provided inside the moving mechanism (10). The pushing device (11) includes an arc-shaped push block (110), a connecting plate (111) is rotatably mounted on the upper surface of the arc-shaped push block (110), a rotating rod (114) is rotatably connected to one end of the connecting plate (111) away from the arc-shaped push block (110), a switching plate (112) is rotatably connected to one end of the connecting plate (111) away from the arc-shaped push block (110) through the rotating rod (114), and the switching plate (112) is rotatably connected to the rotating rod (114) one end away from the connecting plate (111). The end of the switching plate (112) away from the connecting plate (111) is rotatably connected to a connecting cube (115) via a rotating rod (114). The end of the connecting cube (115) away from the switching plate (112) is rotatably connected to a guide post (116). A pH chemical sensor (9) is fixedly connected to the lower end of the guide post (116). Rotating shafts (113) are rotatably installed on opposite sides of the switching plate (112). Two symmetrically distributed sliding grooves (117) are opened on the outer side of the guide post (116).

2. The calcium-magnesium desulfurization wastewater softening pretreatment device according to claim 1, characterized in that: The moving mechanism (10) includes a block (101), with an inclined block (102) fixedly installed at the lower end of the block (101). The block (101) and the inclined block (102) are internally connected. A sliding rod (105) is rotatably connected to opposite sides of the block (101). A rolling element (106) is rotatably installed on the outer surface of the sliding rod (105). A telescopic rod (104) and a spring (103) are fixedly installed at one end of the block (101). The spring (103) is sleeved on the outside of the telescopic rod (104). The two opposite ends of the rotating shaft (113) are rotatably connected to the inner wall of the block (101). Two symmetrically distributed limiting sliders (118) are fixedly installed inside the block (101). The limiting sliders (118) are slidably connected to the inner wall of the groove (117).

3. The calcium-magnesium desulfurization wastewater softening pretreatment device according to claim 2, characterized in that: There are three fixed inclined frames (71) arranged in a circular array. Sliding grooves (711) are provided on opposite sides of the fixed inclined frames (71). The sliding grooves (711) are inclined, and a push block (712) is fixedly installed at the bottom of the sliding groove (711).

4. The calcium-magnesium desulfurization wastewater softening pretreatment device according to claim 3, characterized in that: The telescopic rod (104) and the spring (103) are fixedly connected to the inner wall of the fixed inclined frame (71) at the end away from the block (101), and the circumference of the rolling body (106) is slidably connected to the inner wall of the sliding groove (711).

5. The calcium-magnesium desulfurization wastewater softening pretreatment device according to claim 1, characterized in that: A connecting plate (51) is fixedly installed on the upper end of the rotating barrel (7). A power output device (5) is fixedly connected to the end of the connecting plate (51) away from the rotating barrel (7). The end of the power output device (5) away from the connecting plate (51) extends to the outside of the fixed column (6).

6. The calcium-magnesium desulfurization wastewater softening pretreatment device according to claim 1, characterized in that: The fixed column (6) has an operating cavity (63) inside. A magnet (52) is fixedly installed on the surface of the operating cavity (63). The magnet (52) slides and fits against the outer arc surface of the rotating barrel (7). The height of the magnet (52) corresponds to the height of the fixed inclined frame (71).

7. The calcium-magnesium desulfurization wastewater softening pretreatment device according to claim 6, characterized in that: The fixed column (6) has a through hole (61) in the middle of its lower end, and a channel (62) is fixedly installed in the middle of its lower end. The channel (62) is connected to the through hole (61) and the interior of the running cavity (63).

8. The calcium-magnesium desulfurization wastewater softening pretreatment device according to claim 7, characterized in that: The center point of one end of each of the three fixed oblique frames (71) is perpendicular to the perforation (61) and the channel (62), and the diameter of the perforation (61) and the channel (62) is larger than the diameter of the pH chemical sensor (9).

9. The calcium-magnesium desulfurization wastewater softening pretreatment device according to claim 5, characterized in that: The power output device (5) is fixedly connected to the inner wall of the fixed body (3) at one end away from the fixed column (6). There are three fixed bodies (3). A control box (4) is fixedly installed on the upper surface of the base (1).

10. A method for pre-treatment of calcium-magnesium desulfurization wastewater softening, employing the calcium-magnesium desulfurization wastewater softening pre-treatment device as described in any one of claims 1-9, characterized in that: Includes the following steps: Step 1: Adjust pH value: Add the reagent into the mixing tank (2), and stir and mix the inside of the mixing tank (2) by running the motor at the top of the mixing tank (2); Step 2: Detection and positioning: The power output device (5) is running, the fixed column (6) moves downward, and the power output device (5) drives the fixed column (6) to stop at the bottom, middle and top of the mixing tank (2) respectively; Step 3: Detection: The repulsive force of the magnet (52) pushes the square block (101) and the inclined block (102) to move. The pusher block (712) enters the interior of the inclined block (102). The pusher block (712) pushes the arc-shaped pusher block (110). The arc-shaped pusher block (110) moves upward. The switching plate (112) rotates. The guide column (116) moves downward. The pH chemical sensor (9) moves to the outside of the fixed column (6) for detection. Step 4: pH chemical sensor switching: The magnet (52) rotates away from the inclined block (102) and the square block (101), the spring (103) resets and contracts, the push block (712) moves away from the inclined block (102), the arc-shaped push block (110) moves downward, the switching plate (112) rotates, the guide column (116) moves upward, the pH chemical sensor (9) moves to the inside of the fixed column (6), the magnet (52) continues to move to the next inclined block (102) and the square block (101), and the next pH chemical sensor (9) moves to the outside of the fixed column (6) again.

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