Device and method for preparing magnesium chloride from serpentine tailings

Abstract

The invention relates to the technical field of tailing preparation, and provides a device and method for preparing magnesium chloride from serpentine tailings, the device for preparing magnesium chloride from serpentine tailings comprises a fixed support, the top of the fixed support is fixedly connected with a semi-cylindrical support, and a magnetic separation barrel is rotationally arranged in the semi-cylindrical support through a rotating seat; the device further comprises a circulation frame, the circulation frame is fixedly connected to one side of the top of the semi-cylindrical support, two treatment cavities are formed in the circulation frame, a mineral powder input assembly and a residue output assembly are arranged in the two treatment cavities correspondingly, and a powder liquid discharging assembly is arranged on the other side of the top of the semi-cylindrical support. And the powder liquid discharge assembly is communicated with the mineral powder input assembly. According to the technical scheme, the problem that in the magnetic separation process of the serpentine tailing powder in the prior art, it is difficult to sample, test and detect part of the serpentine tailings in the magnetic separation process of the serpentine tailings continuously is solved.

Description

Technical Field

[0001] The invention relates to the technical field of tailings preparation, and in particular to a device and method for preparing magnesium chloride from serpentine tailings. Background Art

[0002] Serpentine is a general term for a hydrous magnesium-rich silicate mineral, which is named because of its generally green-blue appearance. Serpentine is commonly used as a building material, refractory material and raw material for the steel industry in the prior art. In the process of mining and using serpentine, some serpentine with a volume less than 5 mm and a diameter less than 5 mm will be mined, which is collectively referred to as serpentine tailings by those skilled in the art. As serpentine is continuously mined, the total amount of serpentine tailings is also increasing year by year. However, the magnesium content in serpentine tailings is nearly 40% (calculated as magnesium oxide), which still has a high utilization value. In order to avoid the waste of serpentine tailings resources, people have begun to research and develop the utilization of serpentine tailings.

[0003] The method for treating serpentine tailings in the prior art basically adopts a serpentine treatment process mainly based on melting, which is an inevitable entropy increase process. Even if a circulation technology is used, the discharge of waste slag, waste gas and waste water is still inevitable. It is necessary to use additional resources to utilize the waste slag, waste gas and waste water, thereby increasing the cost of producing magnesium chloride from serpentine tailings. Regardless of which method is used to treat serpentine tailings, it is necessary to further crush the serpentine tailings to crush the serpentine tailings into a standard that can be subjected to a wet magnetic separation process, and then perform a magnetic separation operation on the serpentine tailings to select iron and nickel oxides from the ore powder after the serpentine tailings are crushed, so as to facilitate the pickling of the serpentine ore powder and the subsequent production of magnesium oxide.

[0004] However, in the prior art, during the discharge of the mineral powder after magnetic separation, only the mineral powder with a large amount of moisture is directly discharged from the magnetic separation equipment. However, when the mineral powder is treated, there are certain differences in the treatment methods of different serpentine tailings, and these differences include the differences between the various components in the serpentine. The differences in the serpentine include certain differences in chemical composition and structural stability. Therefore, when the serpentine tailing powder after magnetic separation is pickled, the acidity in the acid solution needs to be adjusted according to the specific chemical composition of the actual serpentine tailing powder. However, in the prior art, the serpentine tailing powder directly discharged through the magnetic separation process not only contains a lot of moisture, which affects the ratio of the acid solution, but also the magnetic separation effect of iron and nickel oxides in the serpentine tailing powder needs to be detected and judged in real time to determine the number of magnetic separations of the serpentine tailing powder, to ensure that the serpentine tailing powder is subjected to efficient and thorough magnetic separation operations, and the magnetic separation process for the serpentine tailing powder is a continuous processing process, so the operator also lacks time to sample and test the serpentine tailing powder during the magnetic separation process. Summary of the invention

[0005] The invention provides a device and method for preparing magnesium chloride from serpentine tailings, which solves the problem in the related art that it is difficult to sample and test part of the serpentine tailings during the continuous magnetic separation process of the serpentine tailings powder.

[0006] The technical solution of the present invention is as follows:

[0007] A device for preparing magnesium chloride from serpentine tailings, comprising a fixed support, a semi-cylindrical support fixedly connected to the top of the fixed support, a magnetic separation cylinder rotatably arranged in the semi-cylindrical support through a rotating seat, and further comprising:

[0008] A circulation frame, the circulation frame is fixedly connected to one side of the top of the semi-cylindrical support, two processing chambers are arranged in the circulation frame, and a mineral powder input component and a residue output component are respectively arranged in the two processing chambers, and a powder-liquid discharge component is arranged on the other side of the top of the semi-cylindrical support, and the powder-liquid discharge component is communicated with the mineral powder input component;

[0009] A partition support plate, the partition support plate is fixedly connected between the semi-cylindrical supports, a powder-liquid conveying mechanism is arranged on the partition support plate, a sliding chamber is formed between the partition support plate and the semi-cylindrical supports, a filter cylinder is slidably arranged in the sliding chamber, the powder-liquid conveying mechanism is connected to the filter cylinder, and a discharge bucket is connected to the bottom of the sliding chamber;

[0010] Among them, a plurality of discharge ports are opened at the bottom of the filter cylinder, a closed door is arranged in the discharge port, a plurality of connecting ports are connected to the multiple closed doors corresponding to one side of the semi-cylindrical support, and a material holding bucket is arranged at the bottom of the connecting port.

[0011] In order to add water to the mineral powder and make the mineral powder flow inside the semi-cylindrical support, further, the mineral powder input component includes a drain pipe and a connecting cylinder, the number of the drain pipes is set to multiple, and the multiple drain pipes are all arranged in the processing chamber located on the lower side. The drain pipe is connected to multiple drainage heads, and the multiple drain pipes are connected to multiple connecting cylinders, and the connecting cylinder is connected to a water adding pipe.

[0012] In order to discharge the iron and nickel oxides adsorbed on the magnetic separation cylinder, further, the residue output assembly includes an inlet and a spray water pipe, the processing chamber located on the upper side is connected to the inlet on the side close to the magnetic separation cylinder, and a receiving hopper body is provided on the inlet, the spray water pipe is arranged on the circulation frame, and the spray water pipe is connected to a plurality of spray heads on the side close to the magnetic separation cylinder.

[0013] In order to discharge the serpentine tailings powder and liquid after magnetic separation or perform secondary magnetic separation, further, the powder and liquid discharge assembly includes a discharge cylinder, an output cylinder and a slurry pump, the discharge cylinder is fixedly connected to the side of the semi-cylindrical support away from the circulation frame, a plurality of discharge pipelines are connected in the discharge cylinder, the output cylinder is fixedly connected to one side of the discharge cylinder, and the output cylinder is connected to the plurality of discharge pipelines, one side of the output cylinder is connected to an output pipeline, the slurry pump is arranged on the output cylinder, the input end of the slurry pump is connected to the output cylinder, and the output end of the slurry pump is connected to the processing chamber located at the lower side.

[0014] In order to transport part of the powder and liquid after magnetic separation into the filter cylinder, on the basis of the present scheme, the powder and liquid conveying mechanism includes a sampling pipeline, a conveying pipeline and a bending control component, and the partition support plate is connected with a plurality of sampling pipelines on the side close to the top of the output cylinder, and valves are provided on the plurality of sampling pipelines, and a transfer cylinder is connected between the bottoms of the plurality of sampling pipelines, and a plurality of conveying pipelines are connected between the transfer cylinder and the filter cylinder, and the bending control component is provided between the plurality of conveying pipelines and the semi-cylindrical support.

[0015] In order to prevent the conveying pipeline from bending, based on the above-mentioned scheme, the bending control component includes a sliding member and a first electric cylinder, the sliding member is fixedly connected between the middle parts of multiple conveying pipelines, the sliding member is slidably arranged in the sliding chamber, the first electric cylinder is arranged on the semi-cylindrical support, and the output end of the first electric cylinder is fixedly connected to the sliding member.

[0016] In order to achieve the purpose of deformation, movement and discharge of the filter cylinder, on the basis of the present scheme, it further includes a flexible support frame, a rigid support plate, an elastic traction structure, a bending plug plate and an engaging plug cylinder. The inner wall of the filter cylinder is provided with a plurality of the flexible support frames, the side of the closing door close to the inner wall of the filter cylinder is fixedly connected with a plurality of the rigid support plates, the elastic traction structure is provided between the closing door and the inner wall of the filter cylinder, the bottom of the closing door is fixedly connected with a plurality of the bending plug plates, a sealing door is hinged in the connecting port, and the inner arc surface of the sealing door is fixedly connected with a plurality of the engaging plug cylinders.

[0017] In order to squeeze the filter cylinder while moving and facilitate the discharge of moisture from the powder and liquid in the filter cylinder, on the basis of the present scheme, further, it also includes a cylinder squeezing assembly, the cylinder squeezing assembly is arranged between the partition support plate and the semi-cylindrical support, the cylinder squeezing assembly includes a fixed part, a movable part, an squeezing roller and a second electric cylinder, the number of the fixed parts is set to multiple, the fixed part is fixedly connected to the bottom of the partition support plate, the number of the movable parts is consistent with the number of the fixed parts, a connecting plate is fixedly connected between the multiple movable parts, the squeezing roller is rotatably connected in the fixed part and the movable part, the second electric cylinder is arranged on the fixed support, and the output end of the second electric cylinder is fixedly connected to the connecting plate.

[0018] The cam is connected with the filter housing by the support frame, and the support frame is provided with a lifting frame, and a screw transmission structure is arranged between the lifting frame and the moving frame. The sliding chamber is provided with the arc through groove on the side close to the moving frame, and the filter housing is fixedly connected with a rotating shaft on the side close to the arc through groove, and the rotating shaft extends to the outside of the arc through groove. The sliding blocks are longitudinally slidably connected on both sides of the lifting frame, and the corresponding ends of the two sliding blocks are rotatably connected with rotating rods, and a rotating ring sleeve is rotatably connected between the two rotating rods, and the rotating shaft is rotatably connected in the rotating ring sleeve.

[0019] A method for preparing magnesium chloride from serpentine tailings, using the above-mentioned device for preparing magnesium chloride from serpentine tailings, comprises the following steps:

[0020] Step 1: Tailings crushing: Use crushing equipment to crush the tailings into mineral powder that can be used for magnetic separation process;

[0021] Step 2, adding mineral powder: after the mineral powder is added into the processing chamber on the lower side, water is added into the connecting cylinder through the water adding pipe, so that the water enters between the connecting cylinder and the plurality of the drainage pipes, and finally the water is sprayed out from the plurality of the drainage heads, so that the water and the mineral powder are mixed together to form a powder liquid which enters into the semi-cylindrical support;

[0022] Step 3, magnetic separation of powder and liquid: driving the magnetic separation cylinder to rotate in the semi-cylindrical support, adsorbing the iron and nickel oxide substances in the powder and liquid onto the magnetic separation cylinder, and then making the magnetic separation cylinder drive the iron and nickel oxide substances to move in the direction of the circulation frame;

[0023] Step 4, discharge iron and nickel oxide substances: add water into the spray water pipe, and then spray the water through the multiple spray heads, so that the water washes the iron and nickel oxide substances adsorbed on the magnetic separation cylinder, and the water mixed with the iron and nickel oxide substances will enter the processing chamber located on the upper side through the receiving hopper body and the inlet, and finally the water and the iron and nickel oxide substances are discharged;

[0024] Step 6, conveying powder and liquid: as the powder and liquid are continuously added into the semi-cylindrical support, the powder and liquid gradually flow toward the direction of the discharge cylinder, and finally flow into the discharge cylinder through the discharge pipeline. If it has been determined that there is no iron or nickel oxide substance remaining in the powder and liquid, it can be directly discharged into a container for subsequent pickling through the output pipeline. When the powder and liquid need to be subjected to secondary magnetic separation, the slurry pump is started to re-convey the powder and liquid to the processing chamber located at the lower side, so that the powder and liquid continue to undergo magnetic separation operation;

[0025] Step 7, powder and liquid sampling: first, move the filter cylinder to the side close to the sampling pipeline, then open the valve on the sampling pipeline, so that the powder and liquid enter the transfer cylinder when passing through the sampling pipeline, and then follow the transfer cylinder, the powder and liquid enter the filter cylinder through the multiple conveying pipelines, and the excess water in the powder and liquid is filtered and discharged through the filter cylinder;

[0026] Step 8, moving the filter cylinder: driving the lifting frame to move within the moving frame through the lead screw transmission structure, so that the lifting frame drives the filter cylinder to move during the lateral movement;

[0027] Step 9, extrusion filtration: the filter cylinder moves between the fixed part and the movable part, the second electric cylinder is started to drive the connecting plate and the movable part to move in the sliding chamber, the distance between the fixed part and the movable part is shortened, and then when the filter cylinder moves between the plurality of extrusion rollers, the filter cylinder is squeezed and drained by the extrusion rollers, and the discharged liquid is discharged through the discharge bucket at the bottom of the semi-cylindrical support;

[0028] Step 10, discharging mineral powder: move the drained filter cylinder toward the connecting port so that the sealing door and the closing door overlap each other, and then make the bent insert plate enter the corresponding meshing insert cylinder, and when the sealing door is pulled to move, the sealing door can pull the closing door to move together, and then the user can discharge the mineral powder in the filter cylinder into the material holding bucket, detect the magnetic substance in the mineral powder and determine the actual chemical composition of the mineral powder;

[0029] Step 11: Prepare acid solution: according to the actual chemical composition of the mineral powder, prepare acid solution with suitable acidity in a container, and add the magnetically separated and dried mineral powder into the container for pickling operation;

[0030] Step 12, filter residue treatment: during the pickling process, some filter residue is produced in the acid solution, the acid solution is filtered, and the filter residue is subjected to hot alkali treatment to obtain a relatively pure sodium silicate solution;

[0031] Step 13, preparing magnesium chloride: adding the acid leachate into a container, adjusting the pH of the acid leachate to 2.9, preparing ferric hydroxide, filtering and separating the leachate and ferric hydroxide, and then adjusting the pH of the acid leachate to 4.7, preparing aluminum hydroxide, filtering and separating the leachate and aluminum hydroxide, and then adjusting the pH of the acid leachate to 5.6, preparing ferrous carbonate, filtering and separating the leachate and ferrous carbonate, and then adjusting the pH of the acid leachate to 7.5, preparing calcium carbonate, filtering and separating the leachate and calcium carbonate, and then adjusting the pH of the acid leachate to 11.1, preparing magnesium hydroxide, and then treating the magnesium hydroxide with dilute hydrochloric acid to prepare magnesium oxide crystals.

[0032] The working principle and beneficial effects of the present invention are:

[0033] 1. In the present invention, when the serpentine ore powder needs to be magnetically separated, the powdered ore powder is first transported to the processing chamber on the lower side of the circulation frame, and water is added to the ore powder through multiple drainage pipes, so that the ore powder forms a powder liquid and flows into the partition support plate, and the magnetic separation cylinder is driven to rotate in the semi-cylindrical support, and the magnetic separation cylinder is made to generate magnetism, so that the iron and nickel oxide substances in the powder liquid are retained on the surface of the magnetic separation cylinder, and then the iron and nickel oxide substances are brought to the magnetic separation cylinder as the magnetic separation cylinder rotates. The upper side of the magnetic separation cylinder is then flushed through the spray pipe and the spray head, so that the water flushes the iron and nickel oxides on the upper side of the magnetic separation cylinder into the processing chamber located on the upper side, and the iron, nickel oxides and water are discharged. The powder and liquid after magnetic separation flow into the output cylinder through the discharge cylinder as the subsequent powder and liquid are continuously added. The powder and liquid after magnetic separation can be directly discharged or transported to the lower processing chamber for secondary magnetic separation, thereby ensuring the magnetic separation effect of serpentine ore powder.

[0034] 2. In the present invention, in the magnetic separation process, in order to judge the magnetic separation effect of the magnetic separation cylinder and detect the specific components in the mineral powder after magnetic separation, so as to facilitate the preparation of the acid solution of the appropriate proportion, the powder liquid is transported into the filter cylinder by the powder liquid conveying mechanism, and the excess water in the powder liquid is filtered by the filter cylinder, and then the filter cylinder is driven to move in the sliding chamber by the lateral moving component. When the filter cylinder passes through the fixed part and the moving part, the filter cylinder is squeezed and deformed by a plurality of mutually corresponding squeezing rollers, so that the water in the powder liquid is further filtered out, and then the filter cylinder is moved to the side of the connecting port, so that the bent plug plate and the meshing plug cylinder are meshed with each other, and then when the user opens the sealing door, the closed door will also be opened together, and then the user can discharge the mineral powder with a certain amount of water in the filter cylinder into the material holding barrel, and the user can detect the mineral powder in the material holding barrel, and perform an acidity test on the mineral powder in the material holding barrel;

[0035] 3. Therefore, the device for preparing magnesium chloride from serpentine tailings can sample and test part of the magnetically separated ore powder when performing magnetic separation on the crushed ore powder, so as to facilitate users to judge the situation of the magnetic separation operation of the ore powder and determine the composition of the magnetically separated ore powder, so as to better configure the acid solution for subsequent pickling. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 It is a schematic diagram of the structure of a partial cross-section of the present invention;

[0039] Figure 3 It is a schematic diagram of the structure of the semi-cylindrical support, the magnetic separation cylinder and the circulation frame of the present invention;

[0040] Figure 4 It is a schematic diagram of a partially sectional planar structure of the cooperation of the semi-cylindrical support, the magnetic separation cylinder, the circulation frame, the partition support plate and the sliding chamber in the present invention;

[0041] Figure 5 It is a schematic diagram of a partial cross-section of the structure of the circulation frame, the mineral powder input assembly, the residue output assembly and the powder and liquid discharge assembly in the present invention;

[0042] Figure 6 For the present invention Figure 5 A schematic diagram of the local enlarged structure at point A in the middle;

[0043] Figure 7It is a partial cross-sectional structural diagram of the cooperation of the semi-cylindrical support, the partition support plate, the powder-liquid conveying mechanism, the cylinder extrusion assembly and the lateral movement assembly in the present invention;

[0044] Figure 8 For the present invention Figure 7 A schematic diagram of the local enlarged structure at B in the middle;

[0045] Fig. 9 It is a schematic diagram of a partial cross-section of the structure of the filter cylinder, the closing door and the flexible support frame in the present invention;

[0046] Fig.10 For the present invention Fig. 9 A schematic diagram of the local enlarged structure at C in the middle;

[0047] Fig.11 It is a schematic diagram of a partial cross-section structure of the filter cylinder, the closed door and the flexible support frame in another perspective of the present invention;

[0048] Fig.12 It is a partial cross-sectional structural diagram of the cooperation between the semi-cylindrical support and the sealing door in the present invention;

[0049] Fig.13 It is a preparation flow chart of the present invention.

[0050] In the figure: 100, mineral powder input assembly; 200, residue output assembly; 300, powder and liquid discharge assembly; 400, powder and liquid conveying mechanism; 500, cylinder extrusion assembly; 600, lateral movement assembly;

[0051] 1. Fixed support; 2. Semi-cylindrical support; 3. Magnetic separation cylinder; 4. Circulation frame; 5. Partition support plate; 6. Sliding chamber; 7. Filter cylinder; 8. Discharge bucket; 9. Closing door; 10. Material storage barrel; 11. Drain pipe; 12. Drain head; 13. Connecting cylinder; 14. Receiver hopper; 15. Spray water pipe; 16. Spray head; 17. Discharge cylinder; 18. Discharge pipeline; 19. Output cylinder; 20. Output pipeline; 21. Slurry pump; 22. Sampling pipeline; 23. Transfer cylinder; 24. Delivery pipeline; 25. Sliding part; 26. An electric cylinder; 27. A flexible support frame; 28. A rigid support plate; 29. ​​A bending plug plate; 30. An engaging plug cylinder; 31. A fixing member; 32. A moving member; 33. An extrusion roller; 34. A second electric cylinder; 35. A moving frame; 36. A lifting frame; 37. A rotating shaft; 38. A sliding block; 39. A rotating rod; 40. A rotating ring sleeve; 41. A magnetic adsorption device; 42. A motor drive device; 43. A sealing tank; 44. A rotating shaft; 45. A winding drum; 46. A spring; 47. A flexible winding sheet; 48. A transmission screw; 49. A driving motor; 50. A sealing door. DETAILED DESCRIPTION

[0052] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Embodiment 1, as Figures 1 to 13 As shown, this embodiment proposes a device for preparing magnesium chloride from serpentine tailings, comprising a fixed support 1, a semi-cylindrical support 2 is fixedly connected to the top of the fixed support 1, a magnetic separation cylinder 3 is rotatably arranged in the semi-cylindrical support 2 through a rotating seat, and a magnetic adsorption device 41 is fixedly arranged on the bottom side of the magnetic separation cylinder 3. By starting the magnetic adsorption device 41, magnetism is generated in the bottom area of ​​the magnetic separation cylinder 3 during the rotation process. When the powder liquid contacts the bottom area of ​​the magnetic separation cylinder 3, the iron and nickel oxides in the powder liquid will be adsorbed to the magnetic separation cylinder 3. On the outer wall, as the magnetic separation cylinder 3 continues to rotate, the magnetic separation cylinder 3 drives the iron and nickel oxides to flip toward the direction of the circulation frame 4, but when the iron and nickel oxides move to the middle and upper area of ​​the magnetic separation cylinder 3, the magnetism of the magnetic separation cylinder 3 in this area is weakened, and the iron and nickel oxides can be washed off the magnetic separation cylinder 3 by spraying. A motor drive device 42 is provided on the semi-cylindrical support 2, and the output end of the motor drive device 42 is fixedly connected to the rotating seat, and the rotating seat and the magnetic separation cylinder 3 are driven to rotate by the motor drive device 42.

[0054] It also includes a circulation frame 4, which is fixedly connected to one side of the top of the semi-cylindrical support 2. Two processing chambers are arranged in the circulation frame 4, and a mineral powder input component 100 and a residue output component 200 are respectively arranged in the two processing chambers. The mineral powder input component 100 includes a drainage pipe 11 and a connecting cylinder 13. The number of drainage pipes 11 is set to be multiple, and the multiple drainage pipes 11 are all arranged in the processing chamber located on the lower side. The drainage pipe 11 is connected with multiple drainage heads 12, and multiple connecting cylinders 13 are connected between the multiple drainage pipes 11. The connecting cylinder 13 is connected with a water adding pipe. When it is necessary to make the mineral powder flow from the semi-cylindrical support 2, after the mineral powder is added to the processing chamber on the lower side, water is added to the connecting cylinder 13 through the water adding pipe, so that the water enters between the connecting cylinder 13 and the multiple drainage pipes 11, and finally the water is sprayed out from the multiple drainage heads 12, so that the water and the mineral powder are mixed together to form a powder liquid that enters the semi-cylindrical support 2;

[0055] The residue output assembly 200 includes an inlet and a spray water pipe 15. The processing chamber located on the upper side is connected to the inlet on the side close to the magnetic separation cylinder 3. The inlet is provided with a receiving hopper 14. The spray water pipe 15 is provided on the circulation frame 4. The spray water pipe 15 is connected to a plurality of spray heads 16 on the side close to the magnetic separation cylinder 3. After the powder liquid containing iron and nickel oxide substances contacts the bottom of the magnetic separation cylinder 3, the iron and nickel oxide substances are attached to the magnetic separation cylinder 3, and then the magnetic separation cylinder 3 drives the iron and nickel oxide substances to flow into the magnetic separation cylinder 3. The nickel oxide material moves to the upper side of the circulation frame 4, and water is added to the spray water pipe 15, and then the water is sprayed through multiple spray heads 16, so that the water washes the iron and nickel oxide materials adsorbed on the magnetic separation cylinder 3, and the water mixed with the iron and nickel oxide materials will enter the processing chamber located on the upper side through the receiving hopper body 14 and the inlet. The processing chamber located on the upper side is connected to an external discharge pipeline, and the water and the iron and nickel oxide materials in the processing chamber located on the upper side can be discharged and recovered through the external discharge pipeline;

[0056] A powder-liquid discharge assembly 300 is provided on the other side of the top of the semi-cylindrical support 2. The powder-liquid discharge assembly 300 is connected to the mineral powder input assembly 100. The powder-liquid discharge assembly 300 includes a discharge cylinder 17, an output cylinder 19 and a slurry pump 21. The discharge cylinder 17 is fixedly connected to the side of the semi-cylindrical support 2 away from the circulation frame 4. A plurality of discharge pipelines 18 are connected in the discharge cylinder 17. The output cylinder 19 is fixedly connected to one side of the discharge cylinder 17, and the output cylinder 19 is connected to the plurality of discharge pipelines 18. One side of the output cylinder 19 is connected to the output pipeline 20. The slurry pump 21 is provided on the output cylinder 19. The input end of the slurry pump 21 is connected to the output cylinder 19, and the output end of the slurry pump 21 is connected to the processing chamber located at the lower side. As the powder liquid is continuously added to the semi-cylindrical support 2, the powder liquid gradually flows in the direction of the discharge cylinder 17, and finally the powder liquid flows into the discharge cylinder 17 through the discharge pipe 18. If it has been determined that there is no iron or nickel oxide substance remaining in the powder liquid, it can be directly discharged into the container for subsequent pickling through the output pipe 20. When the powder liquid needs to be subjected to secondary magnetic separation, the slurry pump 21 is started to transport the powder liquid back to the processing chamber located at the lower side, so that the powder liquid continues to undergo magnetic separation.

[0057] The partition support plate 5 is fixedly connected between the semi-cylindrical supports 2, and a powder-liquid conveying mechanism 400 is arranged on the partition support plate 5. A sliding chamber 6 is formed between the partition support plate 5 and the semi-cylindrical support 2, and a filter cylinder 7 is slidably arranged in the sliding chamber 6. The powder-liquid conveying mechanism 400 is connected with the filter cylinder 7, and the powder-liquid conveying mechanism 400 includes a sampling pipeline 22, a conveying pipeline 24 and a bending control component. The partition support plate 5 is connected to a plurality of sampling pipelines 22 on one side of the top near the output cylinder 19, and valves are arranged on the plurality of sampling pipelines 22. A transfer cylinder 23 is connected between the bottoms of the plurality of sampling pipelines 22, and a plurality of conveying pipelines 24 are connected between the transfer cylinder 23 and the filter cylinder 7. A bending control component is arranged between the plurality of conveying pipelines 24 and the semi-cylindrical support 2, and the bending control component includes a sliding member 25 and a first electric cylinder 26. The middle parts of the plurality of conveying pipelines 24 are fixedly connected. A sliding member 25 is connected, and the sliding member 25 is slidably arranged in the sliding chamber 6. The first electric cylinder 26 is arranged on the semi-cylindrical support 2, and the output end of the first electric cylinder 26 is fixedly connected to the sliding member 25. When it is necessary to sample and test the powder and liquid in the semi-cylindrical support 2, the valve on the sampling pipeline 22 is opened to allow the powder and liquid to enter the transfer cylinder 23 when passing through the sampling pipeline 22, and then follow the transfer cylinder 23. The powder and liquid enter the filter cylinder 7 through multiple conveying pipelines 24, and the excess water in the powder and liquid is filtered and discharged through the filter cylinder 7. In order to prevent the conveying pipeline 24 from overlapping and bending, during the movement of the filter cylinder 7 in the sliding chamber 6, the first electric cylinder 26 is started to drive the sliding member 25 to move horizontally, and the bending length of the conveying pipeline 24 is controlled, so that the conveying pipeline 24 will not affect the reciprocating movement of the filter cylinder 7 in the sliding chamber 6.

[0058] The bottom of the sliding chamber 6 is connected to a discharge bucket 8, and a liquid outlet pipe is connected to the discharge bucket 8. The liquid discharged from the filter cylinder 7 flows into the discharge bucket 8 under the action of gravity, and is finally discharged from the discharge bucket 8 through the liquid outlet pipe.

[0059] Among them, a plurality of discharge ports are provided at the bottom of the filter cylinder 7, and a closed door 9 is provided in the discharge port. A plurality of communication ports are connected to the corresponding closed doors 9 on one side of the semi-cylindrical support 2, and a material holding bucket 10 is provided at the bottom of the communication port, and also includes a flexible support frame 27, a rigid support plate 28, an elastic traction structure, a bending plug plate 29 and an engaging plug cylinder 30. A plurality of flexible support frames 27 are provided on the inner wall of the filter cylinder 7, and a plurality of rigid support plates 28 are fixedly connected to the side of the closed door 9 close to the inner wall of the filter cylinder 7. The flexible support frame 27 is used to After the filter cylinder 7 is squeezed and filtered by multiple squeezing rollers 33, the flexible support frame 27 is re-opened due to its elastic reset feature. Since an elastic traction structure is provided in the filter cylinder 7, the rigid support plate 28 will limit the compression volume of the filter cylinder 7 to prevent the squeezing rollers 33 from causing damage to the elastic traction structure. The bottom of the filter cylinder 7 is made of a hard material, so that the closing door 9 remains stable at the bottom of the filter cylinder 7. The middle and upper parts of the filter cylinder 7 are made of flexible materials, which is convenient for deformation compression filtration of powder and liquid.

[0060] An elastic traction structure is provided between the closing door 9 and the inner wall of the filter cylinder 7, and the elastic traction structure includes a sealing groove body 43, the sealing groove body 43 is arranged in the filter cylinder 7, and a winding drum 45 is rotatably connected to the sealing groove body 43 through a rotating shaft 44, and a spring spring 46 is provided between the rotating shaft 44 and the sealing groove body 43, and a flexible roll sheet 47 is wound on the winding drum 45, and the flexible roll sheet 47 penetrates and is slidably connected with the sealing groove body 43, one end of the flexible roll sheet 47 is fixedly connected to the closing door 9, and one end of the closing door 9 is connected to the discharge port through an elastic sheet. When the closing door 9 is moved together by opening the sealing door 50 so that the discharge port and the connecting port are kept connected, the flexible roll sheet 47 will unwind on the winding drum 45, and will drive the spring spring 46 to contract to generate a torsion force on the rotating shaft 44, and when the closing door 50 is driven to reset, the rotating shaft 44 and the winding drum 45 are driven to reverse through the spring spring 46, so that the closing door 9 is smoothly retracted into the discharge port;

[0061] A plurality of bent plug plates 29 are fixedly connected to the bottom of the closing door 9, a closing door 50 is hinged in the communicating port, and a plurality of engaging insert cylinders 30 are fixedly connected to the inner arc surface of the closing door 50. When the filter cylinder 7 is driven to move, the bent plug plates 29 enter into the corresponding engaging insert cylinders 30, and then when the closing door 50 is pulled to move, the closing door 50 can pull the closing door 9 to move together.

[0062] It also includes a cylinder extrusion assembly 500, which is arranged between the partition support plate 5 and the semi-cylindrical support 2. The cylinder extrusion assembly 500 includes a fixed part 31, a movable part 32, an extrusion roller 33 and a second electric cylinder 34. The number of the fixed parts 31 is set to be multiple, and the fixed parts 31 are fixedly connected to the bottom of the partition support plate 5. The number of the movable parts 32 is consistent with the number of the fixed parts 31. A connecting plate is fixedly connected between the multiple movable parts 32. The fixed parts 31 and the movable parts 32 are both rotatably connected with the extrusion roller 33. A second electric cylinder 34 is provided on the fixed support 1, and the output end of the second electric cylinder 34 is fixedly connected to the connecting plate. When the filter cylinder 7 needs to be compressed and filtered, when the filter cylinder 7 moves between the plurality of fixed parts 31 and the plurality of movable parts 32, the second electric cylinder 34 is started to drive the connecting plate and the movable part 32 to move in the sliding chamber 6, shortening the distance between the fixed part 31 and the movable part 32, and then when the filter cylinder 7 moves between the plurality of squeezing rollers 33, the squeezing rollers 33 squeeze the filter cylinder 7 to drain water;

[0063] The lateral moving assembly 600 is also included. The lateral moving assembly 600 includes a moving frame 35, an arc-shaped through groove and a sliding block 38. The moving frame 35 is fixedly connected to the fixed support 1. A lifting frame 36 is slidably connected in the moving frame 35. A screw transmission structure is arranged between the lifting frame 36 and the moving frame 35. The screw transmission structure includes a transmission screw 48. The transmission screw 48 is rotatably connected in the moving frame 35. The lifting frame 36 is threadedly connected to the transmission screw 48. A driving motor 49 is arranged on the moving frame 35. The output end of the driving motor 49 is fixedly connected to the transmission screw 48. An arc-shaped through groove is formed on one side of the sliding chamber 6 close to the moving frame 35. A rotating shaft 37 is fixedly connected on one side of the filter cylinder 7 close to the arc-shaped through groove. The rotating shaft 37 extends to the outside of the arc-shaped through groove. Both sides of the lifting frame 36 are longitudinally slidable. A sliding block 38 is rotatably connected, and the corresponding ends of the two sliding blocks 38 are rotatably connected to a rotating rod 39. A rotating sleeve 40 is rotatably connected between the two rotating rods 39. The rotating shaft 37 is rotatably connected in the rotating sleeve 40. When it is necessary to drive the filter cylinder 7 to move, the driving motor 49 is started to drive the transmission screw 48 to rotate, and the lifting frame 36 is driven to move horizontally in the moving frame 35. Because the lifting frame 36 will drive the rotating sleeve 40 and the rotating shaft 37 to move together during the movement, the filter cylinder 7 is moved along the trajectory of the arc channel. During the movement of the filter cylinder 7, the rotating shaft 37, the rotating sleeve 40 and the sliding block 38 will move longitudinally in the lifting frame 36, and the rotating rod 39 with a rotatable connection is set to enable the rotating sleeve 40 to adapt to the height change of the filter cylinder 7 caused by the movement.

[0064] Working principle of the device for producing magnesium chloride from serpentine tailings:

[0065] When it is necessary to perform magnetic separation on the serpentine tailings powder, after the mineral powder is added into the processing chamber on the lower side, water is added into the connecting cylinder 13 through the water adding pipe, so that the water enters between the connecting cylinder 13 and the multiple drainage pipes 11, and finally the water is sprayed out from the multiple drainage heads 12, so that the water and the mineral powder are mixed together to form a powder liquid, which enters the semi-cylindrical support 2, and the magnetic separation cylinder 3 is driven to rotate by the motor driving device 42, and the iron and nickel oxide substances in the powder liquid are adsorbed onto the magnetic separation cylinder 3 by the magnetic adsorption device 41, and then the magnetic separation cylinder 3 drives the iron and nickel oxide substances to move in the direction of the circulation frame 4, and water is added into the spray water pipe 15, and then the water is sprayed out through the multiple spray heads 16, so that the water rinses the iron and nickel oxide substances adsorbed on the magnetic separation cylinder 3 , water mixed with iron and nickel oxide substances will enter the processing chamber located on the upper side through the receiving hopper body 14 and the inlet. The processing chamber located on the upper side is connected with an external discharge pipeline, and the water and iron and nickel oxide substances in the processing chamber located on the upper side can be discharged and recovered through the external discharge pipeline. As the powder liquid is continuously added into the semi-cylindrical support 2, the powder liquid gradually flows in the direction of the discharge cylinder 17, and finally the powder liquid flows into the discharge cylinder 17 through the discharge pipeline 18. If it has been determined that there is no iron and nickel oxide substance remaining in the powder liquid, it can be directly discharged into the container for subsequent pickling through the output pipeline 20. When the powder liquid needs to be subjected to secondary magnetic separation, the slurry pump 21 is started to transport the powder liquid back to the processing chamber located on the lower side, so that the powder liquid continues to undergo magnetic separation operation;

[0066] When it is necessary to sample and test the powder and liquid after magnetic separation, first move the filter cylinder 7 to the side close to the sampling pipeline 22, and then open the valve on the sampling pipeline 22 to allow the powder and liquid to enter the transfer cylinder 23 when passing through the sampling pipeline 22, and then follow the transfer cylinder 23, the powder and liquid enter the filter cylinder 7 through multiple conveying pipelines 24, and the excess water in the powder and liquid is filtered and discharged through the filter cylinder 7, and then the lifting frame 36 is driven to move by the screw transmission structure to make the filter cylinder 7 move horizontally in the sliding chamber 6, and the filter cylinder 7 will move between the fixed part 31 and the moving part 32, and start the second electric cylinder 34 to drive the connecting plate and the moving part 32 to move in the sliding chamber 6, shorten the distance between the fixed part 31 and the moving part 32, and then when the filter cylinder 7 moves between the multiple squeezing rollers 33, the filter cylinder 7 is squeezed and drained by the squeezing rollers 33;

[0067] Then move the drained filter cylinder 7 toward the connecting port so that the sealing door 50 and the closing door 9 overlap each other, and then make the bent insert plate 29 enter the corresponding meshing insert cylinder 30. When the sealing door 50 is pulled to move, the sealing door 50 can pull the closing door 9 to move together. Then the user can discharge the mineral powder in the filter cylinder 7 into the material holding bucket 10, so as to detect the magnetic substance in the mineral powder and determine the actual chemical composition of the mineral powder.

[0068] Embodiment 2: This embodiment 2 is based on a device for preparing magnesium chloride from serpentine tailings, and also proposes a method for preparing magnesium chloride from serpentine tailings, comprising the following steps:

[0069] Step 1: Tailings crushing: Use crushing equipment to crush the tailings into mineral powder that can be used for magnetic separation process;

[0070] Step 2, adding mineral powder: After the mineral powder is added into the processing chamber on the lower side, water is added into the connecting cylinder 13 through the water adding pipe, so that the water enters between the connecting cylinder 13 and the multiple drainage pipes 11, and finally the water is sprayed out from the multiple drainage heads 12, so that the water and the mineral powder are mixed together to form a powder liquid and enter the semi-cylindrical support 2;

[0071] Step 3, magnetic separation of powder and liquid: driving the magnetic separation cylinder 3 to rotate in the semi-cylindrical support 2, adsorbing the iron and nickel oxide substances in the powder and liquid onto the magnetic separation cylinder 3, and then making the magnetic separation cylinder 3 drive the iron and nickel oxide substances to move in the direction of the circulation frame 4;

[0072] Step 4: Discharge the iron and nickel oxide substances: add water into the spray water pipe 15, and then spray the water through multiple spray heads 16, so that the water can wash the iron and nickel oxide substances adsorbed on the magnetic separation cylinder 3, and the water mixed with the iron and nickel oxide substances will enter the processing chamber located on the upper side through the receiving hopper body 14 and the inlet, and finally the water and the iron and nickel oxide substances will be discharged;

[0073] Step 6, conveying the powder liquid: as the powder liquid is continuously added into the semi-cylindrical support 2, the powder liquid gradually flows toward the discharge cylinder 17, and finally the powder liquid flows into the discharge cylinder 17 through the discharge pipeline 18. If it has been determined that there is no iron or nickel oxide substance remaining in the powder liquid, it can be directly discharged into the container for subsequent pickling through the output pipeline 20. When the powder liquid needs to be subjected to secondary magnetic separation, the slurry pump 21 is started to re-convey the powder liquid to the processing chamber located at the lower side, so that the powder liquid continues to undergo magnetic separation operation;

[0074] Step 7, powder and liquid sampling: first move the filter cylinder 7 to the side close to the sampling pipeline 22, then open the valve on the sampling pipeline 22, so that the powder and liquid enter the transport cylinder 23 when passing through the sampling pipeline 22, and then follow the transport cylinder 23, the powder and liquid enter the filter cylinder 7 through multiple conveying pipelines 24, and the excess water in the powder and liquid is filtered and discharged through the filter cylinder 7;

[0075] Step 8, moving the filter cylinder 7: driving the lifting frame 36 to move in the moving frame 35 through the screw transmission structure, so that the lifting frame 36 drives the filter cylinder 7 to move during the lateral movement;

[0076] Step 9, extrusion filtration: the filter cylinder 7 moves between the fixed part 31 and the movable part 32, and the second electric cylinder 34 is started to drive the connecting plate and the movable part 32 to move in the sliding chamber 6, shortening the distance between the fixed part 31 and the movable part 32, and then when the filter cylinder 7 moves between the multiple extrusion rollers 33, the filter cylinder 7 is squeezed and drained by the extrusion rollers 33, and the discharged liquid is discharged through the discharge bucket 8 at the bottom of the semi-cylindrical support 2;

[0077] Step 10, discharge of mineral powder: move the drained filter cylinder 7 toward the connecting port, so that the sealing door 50 and the closing door 9 overlap each other, and then make the bent insert plate 29 enter the corresponding meshing insert cylinder 30, and when the sealing door 50 is pulled to move, the sealing door 50 can pull the closing door 9 to move together, and then the user can discharge the mineral powder in the filter cylinder 7 into the material storage barrel 10, detect the magnetic substance in the mineral powder and determine the actual chemical composition of the mineral powder;

[0078] Step 11: Prepare acid solution: according to the actual chemical composition of the mineral powder, prepare acid solution with suitable acidity in a container, and add the magnetically separated and dried mineral powder into the container for pickling operation;

[0079] Step 12, filter residue treatment: during the pickling process, some filter residue is produced in the acid solution, the acid solution is filtered, and the filter residue is subjected to hot alkali treatment to obtain a relatively pure sodium silicate solution;

[0080] Step 13, preparing magnesium chloride: adding the acid leachate into a container, adjusting the pH of the acid leachate to 2.9, preparing ferric hydroxide, filtering and separating the leachate and ferric hydroxide, and then adjusting the pH of the acid leachate to 4.7, preparing aluminum hydroxide, filtering and separating the leachate and aluminum hydroxide, and then adjusting the pH of the acid leachate to 5.6, preparing ferrous carbonate, filtering and separating the leachate and ferrous carbonate, and then adjusting the pH of the acid leachate to 7.5, preparing calcium carbonate, filtering and separating the leachate and calcium carbonate, and then adjusting the pH of the acid leachate to 11.1, preparing magnesium hydroxide, and then treating the magnesium hydroxide with dilute hydrochloric acid to prepare magnesium oxide crystals.

[0081] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for preparing magnesium chloride from serpentine tailings, comprising a fixed support (1), the top of which is fixedly connected to a semi-cylindrical support (2), a magnetic separation cylinder (3) being rotatably arranged in the semi-cylindrical support (2), characterized in that: Also includes: A circulation frame (4), the circulation frame (4) being fixedly connected to one side of the top of the semi-cylindrical support (2), the circulation frame (4) being provided with two processing chambers, the two processing chambers being provided with a mineral powder input assembly (100) and a residue output assembly (200) respectively, and a powder-liquid discharge assembly (300) being provided on the other side of the top of the semi-cylindrical support (2), the powder-liquid discharge assembly (300) being in communication with the mineral powder input assembly (100); A partition support plate (5), the partition support plate (5) is fixedly connected between the semi-cylindrical supports (2), a powder-liquid conveying mechanism (400) is arranged on the partition support plate (5), a sliding chamber (6) is formed between the partition support plate (5) and the semi-cylindrical supports (2), a filter cylinder (7) is slidably arranged in the sliding chamber (6), the powder-liquid conveying mechanism (400) is connected to the filter cylinder (7), and a discharge bucket (8) is connected to the bottom of the sliding chamber (6); The bottom of the filter cylinder (7) is provided with a plurality of discharge ports, a closing door (9) is arranged inside the discharge ports, one side of the semi-cylindrical support (2) is connected with a plurality of connecting ports corresponding to the plurality of closing doors (9), and a material storage bucket (10) is arranged at the bottom of the connecting ports.

2. A device for preparing magnesium chloride from serpentine tailings according to claim 1, characterized in that: The mineral powder input assembly (100) comprises: A drainage pipe (11), wherein the number of the drainage pipes (11) is set to be multiple, and the multiple drainage pipes (11) are all arranged in the processing chamber located at the lower side, and the drainage pipe (11) is connected to multiple drainage heads (12); A connecting cylinder (13), wherein the plurality of drain pipes (11) are connected to the connecting cylinders (13), and a water supply pipe is connected to the connecting cylinders (13).

3. A device for producing magnesium chloride from serpentine tailings according to claim 2, characterized in that, The residue output assembly (200) comprises: An inlet is connected to a side of the processing chamber located on the upper side close to the magnetic separation cylinder (3), and a receiving hopper body (14) is provided on the inlet; A spray water pipe (15), wherein the spray water pipe (15) is arranged on the circulation frame (4), and a side of the spray water pipe (15) close to the magnetic separation cylinder (3) is connected to a plurality of spray heads (16).

4. A device for preparing magnesium chloride from serpentine tailings according to claim 3, characterized in that: The powder-liquid discharge assembly (300) comprises: a discharge cylinder (17), the discharge cylinder (17) being fixedly connected to a side of the semi-cylindrical support (2) away from the circulation frame (4), and a plurality of discharge pipelines (18) being connected in the discharge cylinder (17); An output cylinder (19), the output cylinder (19) being fixedly connected to one side of the discharge cylinder (17), the output cylinder (19) being in communication with a plurality of discharge pipelines (18), and one side of the output cylinder (19) being in communication with an output pipeline (20); A slurry pump (21), wherein the slurry pump (21) is arranged on the output cylinder (19), the input end of the slurry pump (21) is connected to the output cylinder (19), and the output end of the slurry pump (21) is connected to the processing chamber located at the lower side.

5. A device for preparing magnesium chloride from serpentine tailings according to claim 4, characterized in that: The powder-liquid conveying mechanism (400) comprises: Sampling pipeline (22), a plurality of sampling pipelines (22) are connected to one side of the partition support plate (5) close to the top of the output cylinder (19), a valve is provided on each of the plurality of sampling pipelines (22), and a transfer cylinder (23) is connected between the bottoms of the plurality of sampling pipelines (22); A delivery pipeline (24), wherein a plurality of the delivery pipelines (24) are connected between the transfer cylinder (23) and the filter cylinder (7); A bending control component is provided between the plurality of conveying pipelines (24) and the semi-cylindrical support (2).

6. A device for preparing magnesium chloride from serpentine tailings according to claim 5, characterized in that: The bending control assembly comprises: A sliding member (25), wherein the middle parts of the plurality of conveying pipelines (24) are fixedly connected with the sliding member (25), and the sliding member (25) is slidably disposed in the sliding chamber (6); A first electric cylinder (26), wherein the first electric cylinder (26) is arranged on the semi-cylindrical support (2), and an output end of the first electric cylinder (26) is fixedly connected to the sliding member (25).

7. A device for preparing magnesium chloride from serpentine tailings according to claim 6, characterized in that: Also includes: A flexible support frame (27), wherein the inner wall of the filter cylinder (7) is provided with a plurality of the flexible support frames (27); A rigid support plate (28), a plurality of rigid support plates (28) being fixedly connected to one side of the closing door (9) close to the inner wall of the filter cylinder (7); An elastic traction structure, wherein the elastic traction structure is provided between the closing door (9) and the inner wall of the filter cylinder (7); A bent insert plate (29), a plurality of the bent insert plates (29) being fixedly connected to the bottom of the closed door (9); A meshing insert cylinder (30) is provided, wherein a sealing door (50) is hingedly connected in the communication port, and a plurality of the meshing insert cylinders (30) are fixedly connected to the inner arc surface of the sealing door (50).

8. A device for preparing magnesium chloride from serpentine tailings according to claim 7, characterized in that: It also includes a cylinder extrusion assembly (500), which is arranged between the partition support plate (5) and the semi-cylindrical support (2), and the cylinder extrusion assembly (500) includes: A fixing member (31), the number of the fixing members (31) is set to be multiple, and the fixing members (31) are fixedly connected to the bottom of the partition support plate (5); Moving parts (32), the number of the moving parts (32) is the same as the number of the fixed parts (31), and a connecting plate is fixedly connected between the plurality of moving parts (32); A squeezing roller (33), wherein the fixing member (31) and the moving member (32) are both rotatably connected with the squeezing roller (33); A second electric cylinder (34), wherein the fixed support (1) is provided with the second electric cylinder (34), and an output end of the second electric cylinder (34) is fixedly connected to the connecting plate.

9. A device for preparing magnesium chloride from serpentine tailings according to claim 8, characterized in that: Also included is a lateral movement assembly (600), the lateral movement assembly (600) comprising: A moving frame (35), the moving frame (35) is fixedly connected to the fixed support (1), a lifting frame (36) is slidably connected inside the moving frame (35), and a screw transmission structure is provided between the lifting frame (36) and the moving frame (35); An arc-shaped through groove, wherein the sliding chamber (6) is provided with the arc-shaped through groove on one side close to the movable frame (35), and a rotating shaft (37) is fixedly connected to the filter cylinder (7) on one side close to the arc-shaped through groove, and the rotating shaft (37) extends to the outside of the arc-shaped through groove; A sliding block (38), both sides of the lifting frame (36) are longitudinally slidably connected with the sliding blocks (38), the corresponding ends of the two sliding blocks (38) are rotatably connected with a rotating rod (39), a rotating ring sleeve (40) is rotatably connected between the two rotating rods (39), and the rotating shaft (37) is rotatably connected in the rotating ring sleeve (40).

10. A method for preparing magnesium chloride from serpentine tailings, using the device for preparing magnesium chloride from serpentine tailings according to claim 9, characterized in that: The following steps are involved: Step 1: Tailings crushing: Use crushing equipment to crush the tailings into mineral powder that can be used for magnetic separation process; Step 2, adding mineral powder: after the mineral powder is added into the processing chamber on the lower side, water is added into the connecting cylinder (13) through the water adding pipe, so that the water enters between the connecting cylinder (13) and the plurality of drainage pipes (11), and finally the water is sprayed out from the plurality of drainage heads (12), so that the water and the mineral powder are mixed together to form a powder liquid which enters into the semi-cylindrical support (2); Step 3, magnetic separation of powder and liquid: driving the magnetic separation cylinder (3) to rotate in the semi-cylindrical support (2), adsorbing the iron and nickel oxide substances in the powder and liquid onto the magnetic separation cylinder (3), and then causing the magnetic separation cylinder (3) to drive the iron and nickel oxide substances to move in the direction of the circulation frame (4); Step 4, discharge of iron and nickel oxide substances: water is added into the spray water pipe (15), and then the water is sprayed out through the plurality of the spray heads (16), so that the water is used to wash the iron and nickel oxide substances adsorbed on the magnetic separation cylinder (3), and the water mixed with the iron and nickel oxide substances will enter the processing chamber located on the upper side through the receiving hopper body (14) and the inlet port, and finally the water and the iron and nickel oxide substances are discharged; Step 6, conveying the powder liquid: as the powder liquid is continuously added into the semi-cylindrical support (2), the powder liquid gradually flows toward the direction of the discharge cylinder (17), and finally the powder liquid flows into the discharge cylinder (17) through the discharge pipeline (18). If it is determined that there is no iron or nickel oxide substance remaining in the powder liquid, it can be directly discharged into a container for subsequent pickling through the output pipeline (20). When the powder liquid needs to be subjected to secondary magnetic separation, the slurry pump (21) is started to re-convey the powder liquid to the processing chamber located at the lower side, so that the powder liquid continues to undergo magnetic separation operation; Step 7, powder and liquid sampling: first, the filter cylinder (7) is moved to a side close to the sampling pipeline (22), and then the valve on the sampling pipeline (22) is opened, so that the powder and liquid enter the transfer cylinder (23) when passing through the sampling pipeline (22), and then the powder and liquid enter the filter cylinder (7) along the transfer cylinder (23) through the plurality of conveying pipelines (24), and the excess water in the powder and liquid is filtered and discharged through the filter cylinder (7); Step 8, moving the filter cylinder (7): driving the lifting frame (36) to move in the moving frame (35) through the screw transmission structure, so that the lifting frame (36) drives the filter cylinder (7) to move in the process of lateral movement; Step nine, extrusion filtration: the filter cylinder (7) moves between the fixed part (31) and the movable part (32), and the second electric cylinder (34) is started to drive the connecting plate and the movable part (32) to move in the sliding chamber (6), shortening the distance between the fixed part (31) and the movable part (32), and then when the filter cylinder (7) moves between the plurality of extrusion rollers (33), the filter cylinder (7) is squeezed and drained by the extrusion rollers (33), and the discharged liquid is discharged through the discharge bucket (8) at the bottom of the semi-cylindrical support (2); Step 10, discharging mineral powder: move the drained filter cylinder (7) toward the connecting port so that the sealing door (50) and the closing door (9) overlap each other, and then make the bent insert plate (29) enter the corresponding engaging insert cylinder (30). When the sealing door (50) is pulled to move, the sealing door (50) can pull the closing door (9) to move together. Then, the user can discharge the mineral powder in the filter cylinder (7) into the material storage barrel (10), detect the magnetic substance in the mineral powder and determine the actual chemical composition of the mineral powder; Step 11: Prepare acid solution: according to the actual chemical composition of the mineral powder, prepare acid solution with suitable acidity in a container, and add the magnetically separated and dried mineral powder into the container for pickling operation; Step 12, filter residue treatment: during the pickling process, some filter residue is produced in the acid solution, the acid solution is filtered, and the filter residue is subjected to hot alkali treatment to obtain a relatively pure sodium silicate solution; Step 13, preparing magnesium chloride: adding the acid leachate into a container, adjusting the pH of the acid leachate to 2.9, preparing ferric hydroxide, filtering and separating the leachate and ferric hydroxide, and then adjusting the pH of the acid leachate to 4.7, preparing aluminum hydroxide, filtering and separating the leachate and aluminum hydroxide, and then adjusting the pH of the acid leachate to 5.6, preparing ferrous carbonate, filtering and separating the leachate and ferrous carbonate, and then adjusting the pH of the acid leachate to 7.5, preparing calcium carbonate, filtering and separating the leachate and calcium carbonate, and then adjusting the pH of the acid leachate to 11.1, preparing magnesium hydroxide, and then treating the magnesium hydroxide with dilute hydrochloric acid to prepare magnesium oxide crystals.

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