Dust treatment device and mixed calcination treatment method of lepidolite

Abstract

The application provides a dust treatment device and a mixed roasting treatment method of lepidolite. It relates to the field of dust treatment. The dust treatment device comprises a treatment box, and a first air inlet, a first exhaust outlet, a second air inlet and a second exhaust outlet are arranged in the bottom of the treatment box. The dust treatment device and the mixed roasting treatment method of lepidolite provided by the application can detect the pressure difference through the three air pressure sensors, start the cylinder to switch the filter plate to filter the dust-containing gas, and drive the opening and closing plate to gradually close the air inlet to completely close and then open again in the process of switching the filter plate through the setting of the push plate, so that the problem of failure of cleaning caused by the direct escape of unfiltered dust-containing gas from the open exhaust outlet is avoided, the first baffle and the second baffle are arranged to control the two first switches to automatically start the cleaning motor to clean the blocked filter plate, and the dust treatment is realized to reach the control of the polluted environment while avoiding the escape of dust to protect the environment.

Description

Technical Field

[0001] This invention relates to the field of dust control, and in particular to a dust control device and a method for treating lithium mica by mixed roasting. Background Technology

[0002] Lithium, as an important strategic metal resource, is widely used in lithium-ion batteries, glass ceramics, lubricating greases, the nuclear industry, and aerospace. Lepidolite is one of the important mineral raw materials for lithium extraction. The content is usually between 1.5-3.5 wt%, and it contains valuable elements such as potassium, rubidium, and cesium, giving it high comprehensive utilization value. In the crystal structure of lepidolite, lithium is mainly distributed in the aluminosilicate layer, while potassium, rubidium, and cesium exist as interlayer cations. Currently, the main processes for lithium extraction from lepidolite include limestone roasting, sulfuric acid process, pressure cooking, sulfate roasting, and chlorination roasting. The limestone roasting method has problems such as large waste residue and complex impurity removal; the sulfuric acid process faces challenges such as high environmental pressure and high acid and alkali consumption; the pressure cooking method requires a large amount of carbon dioxide and has harsh reaction conditions; the sulfate roasting method is currently the most widely used process in industry, which can achieve a high lithium leaching rate, but its main problem lies in the use of sulfate additives. Large quantities lead to high costs and large amounts of slag, and the recovery efficiency of associated valuable elements such as rubidium and cesium is low. In contrast, the chlorination roasting method can effectively extract rubidium and cesium while efficiently leaching lithium, and the amount of waste residue is small. It is considered a method with development potential. Existing chlorination roasting processes mostly use single chloride salts (such as calcium chloride) as roasting additives, but they have not effectively solved the problems of large amounts of chlorinating agents and the recovery of associated elements. It is necessary to mix lepidolite concentrate with calcium chloride, potassium chloride and calcium hydroxide in a certain proportion. During the mechanical mixing process (such as using V-type mixers, three-dimensional mixers, etc.), dust will inevitably be generated, especially the dust from calcium hydroxide and lepidolite concentrate, which is irritating to the human respiratory system and requires dust control.

[0003] Existing dust control devices use electric push rods to drive baffles and filter plates to move left and right within the guide housing, thereby switching the path of the incoming airflow and the filter plates that filter the airflow. This allows one filter plate to filter dust while the other is cleaned by a vibration component, maintaining the cleanliness efficiency of the filter plate that filters dust.

[0004] However, during the process of switching filter plates to filter dust, the air inlet remains open while the baffle is moving, allowing dust-laden airflow to continuously enter. This results in unfiltered dust-laden gas escaping directly from the open exhaust port, leading to cleaning failure.

[0005] Therefore, it is necessary to provide a dust control device and a method for mixed roasting of lithium mica to solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention provides a dust control device and a method for treating lithium mica by mixed roasting, which solves the problem of cleaning failure caused by unfiltered dust-laden gas escaping directly from an open exhaust port.

[0007] To solve the above-mentioned technical problems, the present invention provides a dust control device, including a control box, the bottom of which is provided with a first air inlet, a first sewage outlet, a second air inlet and a second sewage outlet, and a first air box and a second air box respectively fixedly installed at the bottom of the first air inlet and the second air inlet. An air inlet is connected to one side of the control box. The device also includes: wind pressure sensors, three of which are respectively disposed on the inner wall of the air inlet and one side of the inner wall of the first air box and the second air box.

[0008] A chute is provided at the top of the treatment box;

[0009] An opening and closing mechanism is rotatably mounted on the inner wall of the air inlet. The opening and closing mechanism includes an opening and closing column, which is rotatably mounted on the inner wall of the air inlet. The top end of the opening and closing column penetrates the inner wall of the air inlet and extends to the outside. An opening and closing plate is provided on the surface of the opening and closing column located inside the air inlet. A disc is fixedly mounted on the top end of the opening and closing column. An opening and closing connecting rod is rotatably mounted on the top end of the disc via a convex shaft.

[0010] A drive mechanism is fixedly installed on the top of the treatment box. The drive mechanism includes a cylinder, which is fixedly installed on the top of the treatment box. A push plate is fixedly installed on the output end of the cylinder. The two sides of the push plate are slidably connected to the inside of the slide groove. A connecting plate is fixedly installed on the bottom of the push plate. The convex shaft and the push plate are rotatably connected through the opening and closing connecting rod.

[0011] Filtering mechanism, the filtering mechanism being used to filter dust-laden gas;

[0012] A cleaning mechanism for cleaning the filter mechanism;

[0013] A draft mechanism is used to draw in dust-laden gas into the interior of the treatment box;

[0014] The first switch, two of which are fixedly installed on both sides of the inner wall of the treatment box.

[0015] Preferably, the filtration mechanism is fixedly installed on one side of the connecting plate. The filtration mechanism includes a drive plate, which is fixedly installed on one side of the connecting plate. Four connecting rods are fixedly installed inside the drive plate. A first filter plate and a second filter plate are fixedly installed at both ends of the four connecting rods, respectively. A first baffle is fixedly installed on one side of the first filter plate. The first baffle is adapted to be installed with the first air inlet and the first sewage outlet. A second baffle is fixedly installed on one side of the second filter plate. The second baffle is adapted to be installed with the second air inlet and the second sewage outlet.

[0016] Preferably, the two cleaning mechanisms are symmetrically and rotatably installed on both sides of the inner wall of the treatment box. Each cleaning mechanism includes a rotating column, which is rotatably installed on both sides of the inner wall of the treatment box. One end of the rotating column penetrates the inner wall of the treatment box and extends to the outside. A cleaning motor is fixedly connected to the end of the rotating column located outside the treatment box. The cleaning motor is fixedly installed on one side of the treatment box via a support. A fixing sleeve is fixedly installed on the surface of the rotating column. A cleaning shaft is rotatably installed on the bottom of the fixing sleeve. Three cleaning hammers are fixedly installed on the surface of the cleaning shaft via three rotating sleeves.

[0017] Preferably, one side of the first wind box and the second wind box is connected to an air-guiding mechanism. The air-guiding mechanism includes an air inlet pipe and an air-guiding motor. The two ends of the air inlet pipe are respectively connected to one side of the first wind box and the second wind box. The middle part of the air inlet pipe is connected to an air outlet pipe. The air-guiding motor is mounted on the ground by a support. The output shaft of the air-guiding motor passes through the outer wall of the air inlet pipe and extends into the interior of the air outlet pipe. The output shaft of the air-guiding motor is fixedly mounted with fan blades.

[0018] Preferably, four transverse grooves are symmetrically formed on both sides of the inner wall of the treatment box. Two back-blowing mechanisms are symmetrically slidably installed inside the four transverse grooves. Each back-blowing mechanism includes a back-blowing column, the two ends of which are slidably installed inside the two transverse grooves. The back-blowing column is rotatably installed on the surface of the cleaning shaft through two back-blowing connecting rods. The back-blowing column is fixedly connected to the two back-blowing connecting rods. Two air pressure nozzles are fixedly installed inside the back-blowing column. The input ends of the two air pressure nozzles are connected to air supply pipes. Both air supply pipes penetrate the inner wall of the treatment box and extend to the outside.

[0019] Preferably, the air intake pipe is connected to two recovery mechanisms. Each recovery mechanism includes a negative pressure pipe, one end of which is connected to the outer wall of the air intake pipe, and the other end of which is connected to a recovery box. The recovery box is located on the ground, and a filter screen is installed inside the negative pressure pipe. A discharge pipe is connected to one side of the recovery box.

[0020] Preferably, two second switches are fixedly installed on both sides of the inner wall of the treatment box, and the two second switches are used to control the start and stop of the four air pressure nozzles respectively.

[0021] Preferably, the output end of the gas outlet pipe is connected to a gas storage mechanism, the gas storage mechanism includes a gas storage tank, the top of the gas storage tank is connected to a pressure relief valve, and the two sides of the gas storage tank are respectively connected to a first gas delivery pipe and a second gas delivery pipe. The surface of the first gas delivery pipe is connected to the ends of the two gas delivery pipes on the right side, and the surface of the second gas delivery pipe is connected to the ends of the two gas delivery pipes on the left side.

[0022] A method for mixed roasting of lithium mica includes the following steps:

[0023] S1: Lithium mica concentrate is mechanically mixed with calcium chloride, potassium chloride, and calcium hydroxide to obtain a mixture; wherein, based on the mass of the lithium mica concentrate, the amount of calcium chloride added is 10-30 wt%, the amount of potassium chloride added is 5-20 wt%, and the amount of calcium hydroxide added is 20-40 wt%.

[0024] S2: Place the mixture obtained in S1 in a calcining device and calcinate it in an air atmosphere. The calcination temperature is 700-900℃, the calcination time is 1-6h, and the heating rate is 10-20℃ / min.

[0025] S3: After roasting, cool the product to room temperature to obtain roasted cooked material.

[0026] Preferably, in S1, the mixture is based on the mass of lepidolite concentrate, with calcium chloride added at 15-25 wt%, potassium chloride added at 8-15 wt%, and calcium hydroxide added at 25-35 wt%. The calcium chloride and potassium chloride constitute the chlorinating agent component, with a total addition amount of 20-50 wt%, and the calcium hydroxide added at 25-35 wt%. In S2, the roasting device is a muffle furnace.

[0027] Compared with related technologies, the dust control device provided by the present invention has the following beneficial effects:

[0028] This invention provides a dust control device. It automatically activates a cylinder to switch filter plates to filter dust-laden gas by detecting pressure differences using three wind pressure sensors. A pusher plate simultaneously drives an opening and closing plate to gradually close the air inlet until it is completely closed, then reopens it, preventing unfiltered dust-laden gas from escaping directly from the open exhaust port and causing cleaning failure. A first baffle and a second baffle control two first switches to automatically activate a cleaning motor to clean clogged filter plates. This ensures continuous mixing while simultaneously controlling environmental pollution and preventing dust escape, thus protecting the environment. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a preferred embodiment of a dust control device provided by the present invention;

[0030] Figure 2 Another structural schematic diagram of a preferred embodiment of a dust control device;

[0031] Figure 3 for Figure 2 The diagram shows the location of the first air intake.

[0032] Figure 4 for Figure 2 The diagram shows the installation of the wind pressure sensor.

[0033] Figure 5 for Figure 4 The diagram shows the structure of the opening and closing mechanism;

[0034] Figure 6 for Figure 4 The diagram shows the structure of the drive mechanism.

[0035] Figure 7 for Figure 4 The diagram shown is a structural schematic of the filtration mechanism.

[0036] Figure 8 for Figure 1 The diagram shows the location of the transverse groove;

[0037] Figure 9 for Figure 1 The diagram shows the structure of the cleaning mechanism.

[0038] Figure 10 for Figure 1 The diagram shown is a structural schematic of the induced draft mechanism;

[0039] Figure 11 This is a schematic diagram of the structure of a second embodiment of a dust control device;

[0040] Figure 12 for Figure 11 The diagram shows the installation of the second switch;

[0041] Figure 13 for Figure 12 The diagram shows the installation of the recycling mechanism;

[0042] Figure 14 for Figure 12 The diagram shows the installation of the backflushing mechanism and the cleaning mechanism.

[0043] Figure 15 for Figure 14The diagram shown is a structural schematic of the backflush mechanism;

[0044] Figure 16 for Figure 12 The diagram shows the structure of the gas storage mechanism.

[0045] Figure 17 for Figure 12 The diagram shows the structure of the recycling mechanism.

[0046] The diagram is labeled as follows: 1. Treatment box; 2. Air inlet; 3. Opening and closing mechanism; 301. Opening and closing column; 302. Opening and closing plate; 303. Disc; 304. Protruding shaft; 305. Opening and closing connecting rod; 4. Drive mechanism; 401. Cylinder; 402. Push plate; 403. Connecting plate; 5. Filtration mechanism; 501. Drive plate; 502. Connecting rod; 503. First filter plate; 504. First baffle; 505. Second filter plate; 506. Second baffle; 6. Cleaning mechanism; 601. Rotating column; 602. Cleaning motor; 603. Fixed sleeve; 604. Cleaning shaft; 605. Rotating sleeve; 606. Cleaning hammer; 7. Backflushing mechanism; 701. Backflushing column; 702. Backflushing connecting rod. 703. Air pressure nozzle; 704. Air supply pipe; 8. Air extraction mechanism; 801. Air inlet pipe; 802. Air outlet pipe; 803. Air extraction motor; 804. Fan blade; 9. Recovery mechanism; 901. Recovery box; 902. Negative pressure pipe; 903. Filter screen; 904. Discharge pipe; 10. Slide groove; 11. First air inlet; 12. First sewage outlet; 13. Second air inlet; 14. Second sewage outlet; 15. Wind pressure sensor; 16. First switch; 17. Second switch; 18. Air storage mechanism; 1801. Air storage tank; 1802. Pressure relief valve; 1803. First air supply pipe; 1804. Second air supply pipe; 19. First air box; 20. Second air box; 21. Horizontal groove. Detailed Implementation

[0047] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0048] First Embodiment

[0049] Please refer to the accompanying diagram. Figure 10 A dust control device includes a control box 1. The bottom of the control box 1 is provided with a first air inlet 11, a first sewage outlet 12, a second air inlet 13, and a second sewage outlet 14. The bottom of the first air inlet 11 and the second air inlet 13 are respectively fixedly installed with a first air box 19 and a second air box 20. One side of the control box 1 is connected to an air inlet 2. The device also includes three wind pressure sensors 15, which are respectively disposed on the inner wall of the air inlet 2 and on one side of the inner wall of the first air box 19 and the second air box 20.

[0050] A chute 10 is provided on the top of the treatment box 1;

[0051] An opening and closing mechanism 3 is rotatably mounted on the inner wall of the air inlet 2. The opening and closing mechanism 3 includes an opening and closing column 301, which is rotatably mounted on the inner wall of the air inlet 2. The top end of the opening and closing column 301 penetrates the inner wall of the air inlet 2 and extends to the outside. An opening and closing plate 302 is provided on the surface of the opening and closing column 301 located inside the air inlet 2. A disc 303 is fixedly mounted on the top end of the opening and closing column 301. An opening and closing connecting rod 305 is rotatably mounted on the top end of the disc 303 through a convex shaft 304.

[0052] A drive mechanism 4 is fixedly installed on the top of the treatment box 1. The drive mechanism 4 includes a cylinder 401, which is fixedly installed on the top of the treatment box 1. A push plate 402 is fixedly installed at the output end of the cylinder 401. The two sides of the push plate 402 are slidably connected to the inside of the slide groove 10. A connecting plate 403 is fixedly installed at the bottom of the push plate 402. The convex shaft 304 is rotatably connected to the push plate 402 through the opening and closing connecting rod 305.

[0053] Filtering mechanism 5, the filtering mechanism 5 is used to filter dust-laden gas;

[0054] Cleaning mechanism 6, which is used to clean the filter mechanism 5;

[0055] The air intake mechanism 8 is used to draw in dust-laden gas into the interior of the treatment box 1;

[0056] The first switch 16, the two first switches 16 are respectively fixedly installed on both sides of the inner wall of the treatment box 1.

[0057] The filter mechanism 5 is fixedly installed on one side of the connecting plate 403. The filter mechanism 5 includes a drive plate 501, which is fixedly installed on one side of the connecting plate 403. Four connecting rods 502 are fixedly installed inside the drive plate 501. A first filter plate 503 and a second filter plate 505 are fixedly installed at both ends of the four connecting rods 502, respectively. A first baffle 504 is fixedly installed on one side of the first filter plate 503. The first baffle 504 is adapted to be installed with the first air inlet 11 and the first sewage outlet 12. A second baffle 506 is fixedly installed on one side of the second filter plate 505. The second baffle 506 is adapted to be installed with the second air inlet 13 and the second sewage outlet 14.

[0058] Two cleaning mechanisms 6 are symmetrically and rotatably mounted on both sides of the inner wall of the treatment box 1. Each cleaning mechanism 6 includes a rotating column 601, which is rotatably mounted on both sides of the inner wall of the treatment box 1. One end of the rotating column 601 penetrates the inner wall of the treatment box 1 and extends to the outside. A cleaning motor 602 is fixedly connected to the end of the rotating column 601 located outside the treatment box 1. The cleaning motor 602 is fixedly mounted on one side of the treatment box 1 by a support. A fixing sleeve 603 is fixedly mounted on the surface of the rotating column 601. A cleaning shaft 604 is rotatably mounted on the bottom of the fixing sleeve 603. Three cleaning hammers 606 are fixedly mounted on the surface of the cleaning shaft 604 by three rotating sleeves 605 respectively.

[0059] One side of the first air box 19 and the second air box 20 is connected to an air-guiding mechanism 8. The air-guiding mechanism 8 includes an air inlet pipe 801 and an air-guiding motor 803. The two ends of the air inlet pipe 801 are respectively connected to one side of the first air box 19 and the second air box 20. The middle part of the air inlet pipe 801 is connected to an air outlet pipe 802. The air-guiding motor 803 is mounted on the ground by a support. The output shaft of the air-guiding motor 803 passes through the outer wall of the air inlet pipe 801 and extends into the interior of the air outlet pipe 802. The output shaft of the air-guiding motor 803 is fixedly mounted with a fan blade 804.

[0060] In actual use, the two first switches 16 are used to control the operation of the left and right cleaning motors 602 respectively; the first air inlet 11 is on the right side; the opening and closing plate 302 is adapted to the air inlet 2; the drive plate 501, the first filter plate 503, and the second filter plate 505 are all sealed to the treatment box 1.

[0061] The working principle of the dust control device provided by this invention is as follows:

[0062] First, when mechanically mixing lithium mica concentrate with calcium chloride, potassium chloride and calcium hydroxide, the air inlet 2 is connected to the mixer, and the induced draft motor 803 is started to drive the fan blades 804. At this time, the dust-laden gas generated during mixing in the mixer is under negative pressure. Because the drive plate 501 blocks the flow, the gas passes through the first filter plate 503. After the dust-laden gas passes through the first filter plate 503 to filter the dust, the clean gas flows from the first air inlet 11 to the first air box 19, and then from the air inlet pipe 801 to the air outlet pipe 802 and is discharged.

[0063] Then, as dust accumulates, the resistance of the airflow through the first filter plate 503 increases, causing a relative increase in pressure at the air inlet 2 and a greater pressure difference. When the pressure difference reaches a preset threshold, the air pressure sensor 15 sends a signal to activate the cylinder 401, which pushes the push plate 402. The push plate 402, through the connecting plate 403, drives the drive plate 501 to move and switch the second filter plate 505 to filter the dust-laden gas. At the same time, the push plate 402, through the opening and closing linkage 305, drives the disc 303 to rotate. The disc 303 drives the opening and closing plate 302 to rotate via the opening and closing column 301. As the drive plate 501 moves to the right, the opening and closing plate 302 gradually closes the air inlet 2 to reduce the air intake. When the drive plate 501 reaches the air inlet 2, it is completely closed. When it continues to move past the air inlet 2, it drives the opening and closing plate 302 to reverse again and gradually open the air inlet 2. At this time, the second filter plate 505 filters the dust-laden gas. The drive plate 501 moves to the right side of the air inlet 2, and the second baffle 506 closes the second drain outlet 14. The clean gas is discharged from the second air inlet 13.

[0064] Then, when the first baffle 504 moves to the end of its stroke, the cylinder 401 stops working. The first baffle 504 contacts the first switch 16, closing the first air inlet 11 and opening the first drain outlet 12. At this time, the cleaning motor 602 on the right is started. The cleaning motor 602 drives the rotating column 601 to rotate counterclockwise. The rotating column 601 drives the cleaning shaft 604 to rise upward through the fixed sleeve 603. Then, the cleaning motor 602 reverses, driving the three cleaning hammers 606 to evenly strike the first filter plate 503. After the solid dust falls, it falls into the first drain outlet 12 and is discharged. After cleaning, the cleaning motor 602 is turned off.

[0065] Finally, repeat the above process to complete continuous dust control.

[0066] Compared with related technologies, the dust control device provided by the present invention has the following beneficial effects:

[0067] By setting three wind pressure sensors 15 to detect pressure differences, the cylinder 401 is automatically activated to switch filter plates to filter dust-laden gas. By setting a push plate 402 during the filter plate switching process, the opening and closing plate 302 is simultaneously driven to gradually close the air inlet 2 until it is completely closed and then reopen it, so as to avoid the problem of unfiltered dust-laden gas escaping directly from the open exhaust port, which would lead to cleaning failure. By setting a first baffle 504 and a second baffle 506 respectively to control two first switches 16 to automatically start the cleaning motor 602 to clean the clogged filter plates, while ensuring the continuity of mixing, dust control is achieved to control pollution and prevent dust from escaping and protect the environment.

[0068] Second Embodiment

[0069] Please refer to the following: Figures 11-17Based on the dust control device provided in the first embodiment of this application, the second embodiment of this application proposes another dust control device. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0070] Specifically, the dust control device provided in the second embodiment of this application differs in that four transverse grooves 21 are symmetrically opened on both sides of the inner wall of the control box 1. Two back-blowing mechanisms 7 are symmetrically slidably installed inside the four transverse grooves 21. The back-blowing mechanism 7 includes a back-blowing column 701. The two ends of the back-blowing column 701 are slidably installed inside the two transverse grooves 21. The back-blowing column 701 is rotatably installed on the surface of the cleaning shaft 604 through two back-blowing connecting rods 702. The back-blowing column 701 is fixedly connected to the two back-blowing connecting rods 702. Two air pressure nozzles 703 are fixedly installed inside the back-blowing column 701. The input ends of the two air pressure nozzles 703 are connected to air supply pipes 704. The two air supply pipes 704 penetrate the inner wall of the control box 1 and extend to the outside.

[0071] The air intake pipe 801 is connected to two recovery mechanisms 9. Each recovery mechanism 9 includes a negative pressure pipe 902. One end of the negative pressure pipe 902 is connected to the outer wall of the air intake pipe 801, and the other end of the negative pressure pipe 902 is connected to a recovery box 901. The recovery box 901 is located on the ground. A filter screen 903 is installed inside the negative pressure pipe 902, and a discharge pipe 904 is connected to one side of the recovery box 901.

[0072] Two second switches 17 are fixedly installed on both sides of the inner wall of the treatment box 1. The two second switches 17 are used to control the start and stop of the four air pressure nozzles 703 respectively.

[0073] The output end of the air outlet pipe 802 is connected to the air storage mechanism 18, which includes an air storage tank 1801. The top of the air storage tank 1801 is connected to a pressure relief valve 1802. The two sides of the air storage tank 1801 are respectively connected to a first air supply pipe 1803 and a second air supply pipe 1804. The surface of the first air supply pipe 1803 is connected to the ends of the two air supply pipes 704 on the right side, and the surface of the second air supply pipe 1804 is connected to the ends of the two air supply pipes 704 on the left side.

[0074] In actual use, the two second switches 17 are used to control the operation of the left and right air pressure nozzles 703 respectively; the filter screen 902 is replaced regularly; and the discharge pipe 904 is equipped with a shut-off valve.

[0075] The working principle of the dust control device provided in this embodiment is as follows:

[0076] First, the clean gas discharged from the outlet pipe 802 enters the interior of the gas storage tank 1801, and after reaching its maximum capacity, it is discharged through the pressure relief valve 1802.

[0077] When the first baffle 504 moves to trigger the first switch 16 and close the first air inlet 11, the first baffle 504 also triggers the second switch 17. At this time, the cleaning mechanism 6 and the back-blowing mechanism 7 on the right work simultaneously. The two air pressure nozzles 703 on the right are connected to the first air supply pipe 1803 through the air supply pipe 704. The air pressure nozzles 703 use clean air after filtering dust. When the cleaning shaft 604 rises counterclockwise, it drives the back-blowing column 701 to rotate clockwise. After the cleaning shaft 604 falls back, it also drives the back-blowing column 701 to rotate counterclockwise, thereby realizing the reciprocating swing of the two air pressure nozzles 703 to fully back-blow the first filter plate 503 with clean air to prevent dust from falling into the cleaning area when the cleaning hammer 606 is cleaning. At the same time, the back-blowing airflow assists in cleaning the filter plate during the operation of the cleaning hammer 606 and allows dust to enter the first drain outlet 12.

[0078] Then, the first baffle 504 opens the first drain port 12. After being knocked and fully back-blown, the dust falls into the inside of the right-side recycling box 901. At this time, the channel is opened, and the induced draft mechanism 8 also generates a small negative pressure inside the recycling box 901, sucking the dust into the inside of the recycling box 901, preventing the escaped dust and dust from adhering to the inner wall of the treatment box 1. The filter screen 903 can prevent the dust from being sucked in.

[0079] Finally, after cleaning, reset the first baffle 504 to close the first drain port 12, and manually open the discharge pipe 904 to recover dust and clean the filter screen 903.

[0080] Compared with related technologies, the dust control device provided in this embodiment has the following beneficial effects:

[0081] By setting the second switch 17 to synchronously start the back-flushing mechanism 7, the air pressure nozzle 703 reciprocates to back-flush the filter plate during the cleaning process of the cleaning hammer 606, preventing dust from falling into the cleaning area. The back-flushing airflow can penetrate deep into the filter material for a more thorough cleaning, while also assisting the cleaning hammer 606 in cleaning the filter plate, allowing dust to enter the first drain port 12 to avoid secondary pollution. The back-flushing air source is directly taken from the filtered clean gas and stored in the air storage tank 1801, realizing closed-loop energy utilization. There is no need for an external compressed air source, reducing the system's external energy consumption and equipment complexity. At the same time, using clean gas for back-flushing also avoids damage to the filter. Secondary pollution of the plate is prevented by setting up a recovery box 901. The exhaust mechanism 8 simultaneously generates a slight negative pressure inside the box, which draws the dust that has been shaken off and blown down into the recovery box. This effectively prevents the dust from flying or adhering to the inner wall of the treatment box 1, keeping the inside of the equipment clean and ensuring the concentration of the collected dust. From filtration, switching, back-blowing cleaning to dust negative pressure recovery, the entire process is completed automatically in a closed system. Operators only need to recover the dust through the discharge pipe 904 in the final treatment stage, minimizing the chance of contact with dust and greatly protecting the health and safety of operators, which meets the high standards of occupational health requirements of modern industry.

[0082] A method for mixed roasting of lithium mica

[0083] A method for mixed roasting of lithium mica includes the following steps:

[0084] S1: Lithium mica concentrate is mechanically mixed with calcium chloride, potassium chloride, and calcium hydroxide to obtain a mixture; wherein, based on the mass of the lithium mica concentrate, the amount of calcium chloride added is 10-30 wt%, the amount of potassium chloride added is 5-20 wt%, and the amount of calcium hydroxide added is 20-40 wt%.

[0085] S2: Place the mixture obtained in S1 in a calcining device and calcinate it in an air atmosphere. The calcination temperature is 700-900℃, the calcination time is 1-6h, and the heating rate is 10-20℃ / min.

[0086] S3: After roasting, cool the product to room temperature to obtain roasted cooked material.

[0087] The mixture in S1 is based on the mass of lepidolite concentrate, with calcium chloride added at 15-25 wt%, potassium chloride added at 8-15 wt%, and calcium hydroxide added at 25-35 wt%. The calcium chloride and potassium chloride constitute the chlorinating agent component, with a total addition amount of 20-50 wt%, and the calcium hydroxide added at 25-35 wt%. The roasting device in S2 is a muffle furnace.

[0088] First Embodiment

[0089] Weigh a certain amount of lepidolite concentrate (based on the mass of lepidolite concentrate), add 15 wt% calcium chloride, 8 wt% potassium chloride and 25 wt% calcium hydroxide by its mass, mix thoroughly and evenly to obtain a mixture.

[0090] The mixture was placed in a muffle furnace and heated to 900°C at a rate of 10-20°C / min in air atmosphere, and then held at that temperature for 2 hours.

[0091] After roasting, close the furnace door and allow it to cool naturally or remove it and cool it to room temperature in a dry environment to obtain roasted clinker.

[0092] According to water immersion and inductively coupled plasma optical emission spectrometry (ICP-OES), the lithium leaching rate in this example can reach more than 80.00%.

[0093] Compared with related technologies, the lithium mica mixed roasting treatment method provided by the present invention has the following beneficial effects:

[0094] High lithium leaching rate: This invention utilizes calcium chloride ( potassium chloride ) and calcium hydroxide ( The synergistic mechanism of ) Effectively disrupts the lithium mica aluminosilicate lattice; It significantly reduces the melting point and viscosity of the calcination system and promotes ion diffusion and reaction; Providing an alkaline environment promotes the conversion of lithium into readily soluble lithium salts (such as...). Or it may be easily transformed into The synergistic effect of these three factors significantly increases the lithium leaching rate to over 80%, far exceeding that of single-salt roasting methods. The roasting temperature is significantly reduced: the optimized composite additive system lowers the effective roasting temperature range to 700-900℃, a reduction of 50-200℃ compared to traditional single-calcium chloride roasting (typically >900℃) or sulfate roasting (>950℃), significantly reducing energy consumption and production costs. The total amount of chlorinating agent used is reduced: calcium hydroxide ( The introduction of ) partially replaces the function of chlorinating agents (such as providing...) (Maintaining alkalinity), and its synergistic effect with the chlorinating agent improves chlorination efficiency. Compared to processes that rely solely on chlorinating agents, the chlorinating agent in this invention ( + The total amount of lithium used can be reduced by 10-20%, lowering raw material costs and the burden of subsequent chlorine-containing waste gas treatment. The roasting products are easy to process: in the resulting roasted clinker, lithium mainly exists in water-soluble or acid-soluble forms (such as...). , , The presence of lithium (or its precursors) greatly facilitates subsequent lithium extraction processes via water or acid leaching, improving lithium separation and purification efficiency. This method enhances the comprehensive utilization value of resources: while efficiently extracting lithium, it also removes potassium (or its precursors) from lepidolite. ),rubidium( ),cesium( Valuable elements such as phosphite also have a good activation effect, making them easier to recover in subsequent leaching steps, which significantly improves the overall utilization value and economic efficiency of lithium mica resources.

[0095] Improved environmental friendliness: By reducing the amount of chlorinating agent and optimizing roasting conditions, the amount of harmful chlorine gases (especially chlorine-containing gases) during the roasting process was effectively reduced. This reduces the generation and emission pressure of [products / materials], and mitigates the risks of equipment corrosion and environmental pollution.

[0096] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A dust control device, comprising a control box, wherein the bottom of the control box has a first air inlet, a first sewage outlet, a second air inlet, and a second sewage outlet; a first air box and a second air box are respectively fixedly installed at the bottom of the first air inlet and the second air inlet; and an air inlet is connected to one side of the control box, characterized in that, Also includes: Three wind pressure sensors are respectively disposed on the inner wall of the air inlet and on one side of the inner wall of the first air box and the second air box; A chute is provided at the top of the treatment box; An opening and closing mechanism is rotatably mounted on the inner wall of the air inlet. The opening and closing mechanism includes an opening and closing column, which is rotatably mounted on the inner wall of the air inlet. The top end of the opening and closing column penetrates the inner wall of the air inlet and extends to the outside. An opening and closing plate is provided on the surface of the opening and closing column located inside the air inlet. A disc is fixedly mounted on the top end of the opening and closing column. An opening and closing connecting rod is rotatably mounted on the top end of the disc via a convex shaft. A drive mechanism is fixedly installed on the top of the treatment box. The drive mechanism includes a cylinder, which is fixedly installed on the top of the treatment box. A push plate is fixedly installed on the output end of the cylinder. The two sides of the push plate are slidably connected to the inside of the slide groove. A connecting plate is fixedly installed on the bottom of the push plate. The convex shaft and the push plate are rotatably connected through the opening and closing connecting rod. Filtering mechanism, the filtering mechanism being used to filter dust-laden gas; A cleaning mechanism for cleaning the filter mechanism; A draft mechanism is used to draw in dust-laden gas into the interior of the treatment box; The first switch, two of which are fixedly installed on both sides of the inner wall of the treatment box; Two cleaning mechanisms are symmetrically and rotatably mounted on both sides of the inner wall of the treatment box. Each cleaning mechanism includes a rotating column, which is rotatably mounted on both sides of the inner wall of the treatment box. One end of the rotating column penetrates the inner wall of the treatment box and extends to the outside. A cleaning motor is fixedly connected to the end of the rotating column located outside the treatment box. The cleaning motor is fixedly mounted on one side of the treatment box via a support. A fixing sleeve is fixedly mounted on the surface of the rotating column. A cleaning shaft is rotatably mounted on the bottom of the fixing sleeve. Three cleaning hammers are fixedly mounted on the surface of the cleaning shaft via three rotating sleeves. The first and second air boxes are connected to a drafting mechanism on one side. The drafting mechanism includes an air inlet pipe and a drafting motor. The two ends of the air inlet pipe are respectively connected to one side of the first and second air boxes. The middle part of the air inlet pipe is connected to an air outlet pipe. The drafting motor is mounted on the ground by a support. The output shaft of the drafting motor passes through the outer wall of the air inlet pipe and extends into the interior of the air outlet pipe. The output shaft of the drafting motor is fixedly equipped with fan blades. The treatment box has four symmetrical horizontal slots on both sides of its inner wall. Two back-blowing mechanisms are symmetrically slidably installed inside the four horizontal slots. Each back-blowing mechanism includes a back-blowing column, the two ends of which are slidably installed inside the two horizontal slots. The back-blowing column is rotatably installed on the surface of the cleaning shaft via two back-blowing connecting rods. The back-blowing column is fixedly connected to the two back-blowing connecting rods. Two air pressure nozzles are fixedly installed inside the back-blowing column. The input ends of the two air pressure nozzles are connected to air supply pipes. Both air supply pipes penetrate the inner wall of the treatment box and extend to the outside. The filtration mechanism is fixedly installed on one side of the connecting plate. The filtration mechanism includes a drive plate, which is fixedly installed on one side of the connecting plate. Four connecting rods are fixedly installed inside the drive plate. A first filter plate and a second filter plate are fixedly installed at both ends of the four connecting rods, respectively. A first baffle is fixedly installed on one side of the first filter plate. The first baffle is adapted to the first air inlet and the first sewage outlet. A second baffle is fixedly installed on one side of the second filter plate. The second baffle is adapted to the second air inlet and the second sewage outlet. When the pressure difference reaches the preset threshold, the wind pressure sensor sends a signal to activate the cylinder to push the push plate. The push plate moves the drive plate through the connecting plate to switch the second filter plate to filter the dust-laden gas. At the same time, the push plate drives the disc to rotate through the opening and closing linkage. The disc drives the opening and closing plate to rotate through the opening and closing column. As the drive plate moves to the right, the opening and closing plate gradually closes the air inlet to reduce the air volume. When the drive plate reaches the air inlet, it is completely closed. When it continues to move past the air inlet, it drives the opening and closing plate to reverse again and gradually open the air inlet. At this time, the second filter plate filters the dust-laden gas. The drive plate moves to the right side of the air inlet, the second baffle closes the second drain port, and the clean gas is discharged from the second air outlet. When the first baffle moves to the end of its stroke, the cylinder stops working. The first baffle contacts the first switch, closing the first air inlet and opening the first drain outlet. At this time, the cleaning motor on the right is started.

2. The dust control device according to claim 1, characterized in that, The intake pipe is connected to two recovery mechanisms. Each recovery mechanism includes a negative pressure pipe. One end of the negative pressure pipe is connected to the outer wall of the intake pipe, and the other end of the negative pressure pipe is connected to a recovery box. The recovery box is located on the ground. A filter screen is installed inside the negative pressure pipe, and an exhaust pipe is connected to one side of the recovery box.

3. The dust control device according to claim 1, characterized in that, Two second switches are fixedly installed on both sides of the inner wall of the treatment box. The two second switches are used to control the start and stop of the four air pressure nozzles respectively.

4. The dust control device according to claim 1, characterized in that, The outlet end of the gas pipe is connected to a gas storage mechanism, which includes a gas storage tank. The top of the gas storage tank is connected to a pressure relief valve. The two sides of the gas storage tank are respectively connected to a first gas delivery pipe and a second gas delivery pipe. The surface of the first gas delivery pipe is connected to the ends of the two gas delivery pipes on the right side, and the surface of the second gas delivery pipe is connected to the ends of the two gas delivery pipes on the left side.

5. A method for treating lithium mica by mixed roasting, requiring the use of a dust control device as described in any one of claims 1-4, characterized in that, Includes the following steps: S1: Lithium mica concentrate is mechanically mixed with calcium chloride, potassium chloride, and calcium hydroxide to obtain a mixture; wherein, based on the mass of the lithium mica concentrate, the amount of calcium chloride added is 10-30 wt%, the amount of potassium chloride added is 5-20 wt%, and the amount of calcium hydroxide added is 20-40 wt%. S2: Place the mixture obtained in S1 in a calcining device and calcinate it in an air atmosphere. The calcination temperature is 700-900℃, the calcination time is 1-6h, and the heating rate is 10-20℃ / min. S3: After roasting, cool the product to room temperature to obtain roasted cooked material.

6. The method for mixed roasting of lithium mica according to claim 5, characterized in that, The mixture in S1 is based on the mass of lepidolite concentrate, with calcium chloride added at 15-25 wt%, potassium chloride added at 8-15 wt%, and calcium hydroxide added at 25-35 wt%. The calcium chloride and potassium chloride constitute the chlorinating agent component, with a total addition amount of 20-50 wt%, and the calcium hydroxide added at 25-35 wt%. The roasting device in S2 is a muffle furnace.

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