High-temperature coal furnace flue gas treatment equipment and lepidolite super-high-efficiency deep lithium extraction process

Abstract

The application provides high-temperature coal furnace flue gas treatment equipment and a super-efficient deep lithium extraction process for lepidolite. The high-temperature coal furnace flue gas treatment equipment comprises a tower body and a gas inlet pipe, and a bottom groove is communicated with the bottom of the tower body. The high-temperature coal furnace flue gas treatment equipment and the super-efficient deep lithium extraction process for lepidolite provided by the application ensure that most of the flue gas flows through the primary filler disc by setting the gas outlet below the primary filler disc, the remaining flue gas flows through the secondary filler disc and the tertiary filler disc to assist in treating the flue gas, and finally the flue gas is discharged after passing through the second filler disc and the demisting plate, thereby improving the treatment efficiency, saving the cost, improving the purification efficiency, ensuring the standard discharge, ensuring that the liquid is uniformly covered on the surface of the spherical filler to form a liquid film by setting the spray pipe to spray the circulating liquid downward, reducing the unnecessary consumption of reagents by recycling the circulating liquid to the circulating liquid tank through the liquid collecting pipe, and avoiding the circulating liquid from entering the gas inlet pipe by setting the baffle.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment, and in particular to high-temperature coal furnace flue gas treatment equipment and a high-efficiency deep lithium extraction process from lepidolite. Background Technology

[0002] High-temperature coal furnace flue gas treatment equipment is a key environmental protection and safety assurance device used in the ultra-efficient deep lithium extraction process of lepidolite to purify the highly toxic, highly corrosive, and easily scaled flue gas generated during the process and bring it up to emission standards. In the lithium extraction process, finely ground and mixed materials are placed into a high-temperature coal furnace, where coal is heated to a high roasting temperature to obtain clinker. The combustion of coal produces a large amount of flue gas. The core objective of this equipment is to completely solve the pain points of rapid corrosion, system blockage, and unstable operation caused by the flue gas generated by the high-temperature coal furnace by combining flue gas purification with anti-scaling design, ensuring continuous and stable operation of the process. The core of the ultra-efficient deep lithium extraction process of lepidolite is to maximize the extraction and recovery of lithium from lepidolite ore with high purity. The core objective of this process is to overcome the bottlenecks of traditional lepidolite lithium extraction processes in terms of comprehensive lithium recovery rate, utilization of associated element value, energy and material consumption, and environmental impact, achieving near-limit deep extraction of lithium resources and a green, efficient, and sustainable development of the entire production process.

[0003] The existing high-temperature coal furnace flue gas treatment equipment requires the operator to first connect the flue gas outlet to the inlet pipe, inject absorbent liquid, and then the atomizing nozzle forms a mist film. The absorbent liquid flows down through the first through hole of the multi-layer annular corrugated plate, contacting all the corrugated plates in a short time. The exhaust equipment is then activated, and the flue gas enters from the inlet pipe. The lower flue gas flows upward through the second through hole of the annular corrugated plate and reacts with the absorbent liquid. The treated gas is then discharged.

[0004] However, in existing flue gas treatment equipment, the multi-layer annular corrugated plates are designed with decreasing capacity, with each upper corrugated plate handling less flue gas. During the flue gas treatment process, when the flue gas enters the equipment evenly through the inlet pipe, the middle section has a greater processing capacity, while the upper two corrugated plates have a lower processing capacity. In this case, the processing capacity of the middle corrugated plates is wasted, and the upper two corrugated plates fail to process the flue gas in time, resulting in treatment failure. The unpurified flue gas is discharged without meeting the standards and still pollutes the environment. At the same time, the overall processing capacity is low because the corrugated plates have less contact surface with the flue gas.

[0005] Therefore, it is necessary to provide high-temperature coal-fired flue gas treatment equipment and an ultra-efficient deep lithium extraction process from lepidolite to solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention provides a high-temperature coal furnace flue gas treatment device and a lithium mica ultra-efficient deep lithium extraction process, which solves the problem that the middle corrugated plate has a higher processing capacity but wastes processing capacity, while the upper two corrugated plates do not process the flue gas in time, resulting in the failure of flue gas treatment and the pollution of the environment after the unpurified flue gas is discharged.

[0007] To solve the above-mentioned technical problems, the present invention provides a high-temperature coal furnace flue gas treatment device, including a tower body and an air inlet pipe. The bottom of the tower body is connected to a bottom trough, the bottom of the bottom trough is connected to a liquid collection pipe, and the top of the tower body is connected to an exhaust pipe. The outlet end of the air inlet pipe penetrates the outer wall of the bottom trough and extends into the interior. Four connecting columns are fixedly installed at the top of the air inlet pipe. The bottom of the bottom trough is fixedly installed on the ground by three support columns. The outer wall of the tower body is connected to two viewing windows for observing and inspecting the tower body. The device also includes a circulation mechanism.

[0008] A first packing mechanism is fixedly installed on the top of the four connecting columns. The first packing mechanism includes a primary packing disc, which is fixedly installed on the top of the four connecting columns. A secondary packing disc is fixedly installed on the top of the primary packing disc, and a tertiary packing disc is fixedly installed on the top of the secondary packing disc. A surrounding plate is fixedly installed on the top of the tertiary packing disc. Several first through holes are opened on the surfaces of the primary, secondary, and tertiary packing discs. The outlet end of the air inlet pipe is located below the primary packing disc.

[0009] The second packing disc is fixedly installed on the inner wall of the tower body, and the surface of the second packing disc is provided with a plurality of second through holes;

[0010] The spraying mechanism, comprising two spraying mechanisms respectively used to spray circulating liquid onto the top of the first packing mechanism and the second packing disc, and the circulation mechanism used to supply circulating liquid to the two spraying mechanisms.

[0011] Preferably, a baffle is fixedly installed between the four connecting columns, and a demisting plate is fixedly installed on the inner wall of the tower body.

[0012] Preferably, the circulation mechanism is fixedly installed on the ground. The circulation mechanism includes a circulation tank, which is fixedly installed on the ground. A circulation tank cover is provided on the top of the circulation tank. A circulation pump is fixedly installed on the top of the circulation tank. The pump's pumping end is connected to the inside of the circulation tank through a pumping pipe. The pump's outlet end is connected to a main circulation pipe. Two circulation branch pipes are connected to one side of the main circulation pipe. The end of the collection pipe is connected to one side of the circulation tank.

[0013] Preferably, the two spraying mechanisms are respectively connected to the bottom ends of the two circulating liquid distribution pipes. Each spraying mechanism includes an electromagnetic tee, which is connected to the bottom end of the circulating liquid distribution pipe. The bottom end of the electromagnetic tee is connected to a connecting pipe, the top end of which is rotatably installed with the bottom end of the electromagnetic tee. The bottom end of the connecting pipe is connected to a spraying pipe, and several spraying holes are provided on both sides of the spraying pipe. The two spraying pipes are respectively adapted and installed to the first packing mechanism and the second packing disc.

[0014] Preferably, one side of each of the two electromagnetic tees is connected to a cleaning mechanism. The cleaning mechanism includes a clean water tank and clean water pipes. The two clean water pipes are respectively connected to one side of the two electromagnetic tees. The clean water tank is fixedly installed on the ground. A clean water tank cover is provided on the top of the clean water tank. A clean water pump is fixedly installed on the top of the clean water tank. The pumping end of the clean water pump is connected to the inside of the clean water tank through a pumping pipe. The outlet end of the clean water pump is connected to a main clean water pipe. One side of the main clean water pipe is connected to one end of each of the two clean water pipes.

[0015] Preferably, a drive mechanism is fixedly installed on one side of each of the two electromagnetic tees. The drive mechanism includes a motor and a second gear. The motor is fixedly installed on one side of the electromagnetic tees through a housing. The output shaft of the motor is fixedly connected to a first gear. The second gear is fixedly installed on the surface of the connecting pipe. The first gear meshes with the second gear.

[0016] Preferably, a sealing mechanism is fixedly installed at the bottom of the inner wall of each of the two spray pipes. The sealing mechanism includes a fixing plate, which is fixedly installed at the bottom of the inner wall of the spray pipe. A connecting plate is fixedly connected to both sides of the fixing plate by a spring. A sealing plate is fixedly installed on one side of each of the two connecting plates. One end of each sealing plate passes through the inner wall of both ends of the spray pipe and extends to the outside. An inclined plate is fixedly installed at the end of each sealing plate located outside the spray pipe. A plurality of mating holes are opened on the surface of each sealing plate.

[0017] Preferably, each of the two spray pipes has several water holes at its bottom, and the docking hole is adapted to the water holes. A pusher plate is fixedly installed at one end of each of the two sealing plates located below the second packing disc. Two auxiliary annular plates are fixedly installed on the inner wall of the tower body, and the two auxiliary annular plates are adapted to the two inclined plates located above the second packing disc.

[0018] Preferably, a wall scraping mechanism is fixedly installed on the inner wall of the tower body. The wall scraping mechanism includes an annular guide trough, which is fixedly installed on the inner wall of the tower body. An annular damping groove is slidably connected to the inner side of the annular guide trough through two scrapers. The annular damping groove is fixedly installed on the inner wall of the tower body. Two symmetrical sewage outlets are opened at the bottom of the annular guide trough. Both sewage outlets are connected to a sewage collection tank through a sewage outlet pipe. The two sewage collection tanks are set on the ground. The push plate is adapted to the scraper and the two scrapers are adapted to the tower body.

[0019] The ultra-efficient deep lithium extraction process from lepidolite includes the following steps;

[0020] Step S1: Mixing: Lithium mica and auxiliary materials are mixed in a certain proportion to obtain a mixture; wherein, the auxiliary materials are sodium sulfate, potassium sulfate, calcium sulfate, calcium carbonate, calcium hydroxide, calcium oxide, ferric sulfate, aluminum sulfate, ammonium sulfate, sulfuric acid or more.

[0021] Step S2: Grinding: Grind the mixture obtained in step S1 to a certain particle size to obtain a finely ground mixture;

[0022] Step S3: Calcination: The finely ground mixture obtained in step S2 is placed into a high-temperature coal furnace for high-temperature calcination at a temperature of 750-1000℃ for a reaction time of 2-10 minutes to obtain clinker. The flue gas generated after high-temperature calcination in the high-temperature coal furnace is fed into a high-temperature coal furnace flue gas treatment device for treatment before being discharged.

[0023] Step S4: Leaching: Leach the clinker obtained in step S3 and water at a ratio of 0.5-2:1 for 5-10 minutes to obtain leachate;

[0024] Step S5: Impurity Removal: Remove impurities from the leachate obtained in step S4. First, add ammonia, calcium oxide or caustic soda to the leachate to adjust the pH to 10-13. Then, add soda ash according to the amount of calcium. React for 20-120 minutes, with 0-30% excess soda ash. After filtration, obtain the purified solution.

[0025] Step S6: Concentration: The purified solution obtained in step S5 is concentrated to a lithium oxide concentration of 20-60 g / L to obtain a purified concentrated solution.

[0026] Step S7: Lithium Deposition: The purified concentrate obtained in Step S6 is subjected to lithium deposition. ① Soda ash solution is added to the purified concentrate, centrifuged, dried and packaged to obtain lithium carbonate product; ② Sodium hydroxide solution is added to the purified concentrate, and sodium sulfate is removed by freezing, concentrated, and lithium hydroxide is separated by centrifugation, dried, pulverized and packaged to obtain lithium hydroxide product; ③ Calcium chloride is added to the purified concentrate, calcium sulfate is removed by filtration, the resulting lithium chloride solution is concentrated to precipitate lithium chloride, dried and packaged to obtain lithium chloride product.

[0027] Compared with related technologies, the high-temperature coal-fired furnace flue gas treatment equipment provided by the present invention has the following beneficial effects:

[0028] This invention provides a high-temperature coal-fired furnace flue gas treatment device. By setting an inlet pipe to exit the gas below the primary packing disc, most of the flue gas flows through the primary packing disc. The remaining flue gas flows through the secondary and tertiary packing discs for auxiliary treatment. Finally, the flue gas is discharged after passing through the second packing disc and the demister plate. This improves treatment efficiency, saves costs, and also improves purification efficiency to ensure compliance with emission standards. By setting a spray pipe to spray circulating liquid downwards, the liquid is ensured to uniformly cover the surface of the spherical packing to form a liquid film. By setting a collection pipe to collect the circulating liquid to the circulating liquid tank, unnecessary consumption of reagents is reduced. By setting a baffle, the circulating liquid is prevented from entering the inlet pipe. Attached Figure Description

[0029] Figure 1 A schematic diagram of a preferred embodiment of the high-temperature coal furnace flue gas treatment equipment provided by the present invention;

[0030] Figure 2 Another structural schematic diagram of a preferred embodiment of a high-temperature coal furnace flue gas treatment device;

[0031] Figure 3 for Figure 1 The diagram shows the installation of the first packing mechanism;

[0032] Figure 4 for Figure 3 The diagram shows the installation of the connecting column;

[0033] Figure 5 for Figure 3 The diagram shows the structure of the first packing mechanism.

[0034] Figure 6 for Figure 5 Another structural schematic diagram of the first packing mechanism shown;

[0035] Figure 7 for Figure 3 The diagram shows the structure of the spraying mechanism.

[0036] Figure 8 for Figure 3 The diagram shows the structure of the circulating mechanism.

[0037] Figure 9 This is a schematic diagram of the second embodiment of the high-temperature coal furnace flue gas treatment equipment;

[0038] Figure 10 Another structural schematic diagram of the second embodiment of the high-temperature coal furnace flue gas treatment equipment;

[0039] Figure 11 for Figure 9 The diagram shows the installation of the cleaning mechanism.

[0040] Figure 12 for Figure 11 The diagram shows the structure of the cleaning mechanism.

[0041] Figure 13 for Figure 11 The diagram shows the structure of the drive mechanism.

[0042] Figure 14 for Figure 11 The diagram shows the structure of the closed mechanism.

[0043] Figure 15 for Figure 14 An enlarged schematic diagram of part A is shown below;

[0044] Figure 16 for Figure 14 An enlarged schematic diagram of part B is shown below;

[0045] Figure 17 for Figure 11 The diagram shows the structure of the wall scraping mechanism.

[0046] Figure 18 for Figure 11 The diagram shows the installation of the waste collection tank.

[0047] Numbered in the diagram: 1. Tower body; 2. Circulation mechanism; 201. Circulating liquid tank; 202. Circulating liquid tank cover; 203. Circulating pump; 204. Main circulating liquid pipe; 205. Circulating liquid branch pipe; 3. Spraying mechanism; 301. Electromagnetic tee; 302. Connecting pipe; 303. Spray pipe; 304. Spray hole; 4. First packing mechanism; 401. Primary packing disc; 402. Secondary packing disc; 403. Tertiary packing disc; 404. Enclosure plate; 405. First through hole; 5. Second packing disc; 51. Second through hole; 6. Cleaning mechanism; 601. Clean water tank; 602. Clean water tank cover; 603. Clean water pump; 604. Main clean water pipe; 605. Clean water... 7. Drive mechanism, 701. Motor, 702. Gear 1, 703. Gear 2, 8. Scraping mechanism, 801. Annular guide groove, 802. Annular damping groove, 803. Scraper, 804. Sewage outlet, 805. Sewage pipe, 9. Sealing mechanism, 901. Fixing plate, 902. Spring, 903. Connecting plate, 904. Sealing plate, 905. Inclined plate, 906. Docking hole, 10. Pushing plate, 11. Bottom trough, 12. Liquid collection pipe, 13. Exhaust pipe, 14. Air inlet pipe, 15. Support column, 16. Viewing window, 17. Demisting plate, 18. Clean water hole, 19. Sewage collection tank, 20. Connecting column, 21. Baffle plate, 22. Auxiliary annular plate. Detailed Implementation

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0049] First Embodiment

[0050] Please refer to the following: Figures 1-8 A high-temperature coal furnace flue gas treatment device includes a tower body 1 and an inlet pipe 14. The bottom of the tower body 1 is connected to a bottom trough 11, and the bottom of the bottom trough 11 is connected to a liquid collection pipe 12. The top of the tower body 1 is connected to an exhaust pipe 13. The outlet end of the inlet pipe 14 passes through the outer wall of the bottom trough 11 and extends into the interior. Four connecting columns 20 are fixedly installed at the top of the inlet pipe 14. The bottom of the bottom trough 11 is fixedly installed on the ground by three support columns 15. The outer wall of the tower body 1 is connected to two viewing windows 16 for observing and inspecting the tower body 1. The device also includes a circulation mechanism 2.

[0051] The first packing mechanism 4 is fixedly installed on the top of the four connecting columns 20. The first packing mechanism 4 includes a primary packing disc 401, which is fixedly installed on the top of the four connecting columns 20. A secondary packing disc 402 is fixedly installed on the top of the primary packing disc 401. A tertiary packing disc 403 is fixedly installed on the top of the secondary packing disc 402. A surrounding plate 404 is fixedly installed on the top of the tertiary packing disc 403. Several first through holes 405 are opened on the surfaces of the primary packing disc 401, the secondary packing disc 402 and the tertiary packing disc 403. The outlet end of the air inlet pipe 14 is located below the primary packing disc 401.

[0052] The second packing disc 5 is fixedly installed on the inner wall of the tower body 1, and the surface of the second packing disc 5 is provided with a plurality of second through holes 51.

[0053] The two spraying mechanisms 3 are respectively used to spray circulating liquid onto the top of the first packing mechanism 4 and the second packing disc 5, and the circulation mechanism 2 is used to supply circulating liquid to the two spraying mechanisms 3.

[0054] A shield 21 is fixedly installed between the four connecting columns 20, and a demisting plate 17 is fixedly installed on the inner wall of the tower body 1.

[0055] The circulation mechanism 2 is fixedly installed on the ground. The circulation mechanism 2 includes a circulation liquid tank 201, which is fixedly installed on the ground. A circulation liquid tank cover 202 is provided on the top of the circulation liquid tank 201. A circulation pump 203 is fixedly installed on the top of the circulation liquid tank 201. The water pumping end of the circulation pump 203 is connected to the inside of the circulation liquid tank 201 through a water pumping pipe. The water outlet end of the circulation pump 203 is connected to a circulation liquid main pipe 204. Two circulation liquid branch pipes 205 are connected to one side of the circulation liquid main pipe 204. The end of the liquid collecting pipe 12 is connected to one side of the circulation liquid tank 201.

[0056] The two spraying mechanisms 3 are respectively connected to the bottom ends of the two circulating liquid distribution pipes 205. The spraying mechanism 3 includes an electromagnetic tee 301, which is connected to the bottom end of the circulating liquid distribution pipe 205. The bottom end of the electromagnetic tee 301 is connected to a connecting pipe 302. The top end of the connecting pipe 302 is rotatably installed with the bottom end of the electromagnetic tee 301. The bottom end of the connecting pipe 302 is connected to a spray pipe 303. Several spray holes 304 are opened on both sides of the spray pipe 303. The two spray pipes 303 are respectively adapted and installed to the first packing mechanism 4 and the second packing disc 5.

[0057] In actual use, the tower body 1 is a spray tower body; the circulating liquid tank 201 is replenished with water and reagents periodically, the reagent being sodium hydroxide, and the mixed circulating liquid is a sodium hydroxide solution, which neutralizes the flue gas to reduce acidity; the exhaust pipe 13 is externally connected to a negative pressure extraction device; several spherical packings are placed above the primary packing disc 401, the secondary packing disc 402, the tertiary packing disc 403, and the second packing disc 5; the viewing window 16 is enclosed with a transparent glass plate; the electromagnetic tee 301 below is fixedly installed at the bottom of the second packing disc 5 by four fixing rods.

[0058] The working principle of the high-temperature coal furnace flue gas treatment equipment provided by this invention is as follows:

[0059] First, connect the air inlet pipe 14 to the outlet of the flue gas generated by the high-temperature coal furnace. When processing the flue gas generated by the high-temperature coal furnace, start the circulation pump 203 to draw sodium hydroxide solution from the circulating liquid tank 201. The circulating liquid main pipe 204 supplies circulating liquid to the two circulating liquid branch pipes 205, which in turn supply circulating liquid to the two electromagnetic tees 301. After passing through the electromagnetic tees 301, the circulating liquid goes through the connecting pipe 302 to the spray pipe 303 and is sprayed out from the spray holes 304 on both sides. At this time, the circulation... The amount and distance of the liquid sprayed from the central spray hole 304 are matched with the first packing mechanism 4 and the second packing disc 5. The central spray circulating liquid is at most reduced to the diameter of the first packing mechanism 4 and the second packing disc 5 at both ends. At this time, the spray pipe 303 sprays circulating liquid onto the surface of the spherical packing, evenly covering the surface of the spherical packing. The rounded structure of the spherical packing can guide the liquid to flow along its surface to form a continuous liquid film, while avoiding the deviation caused by direct liquid scouring, ensuring that the liquid is evenly distributed in the packing layer.

[0060] Then, the flue gas enters through the inlet pipe 14, where the baffle 21 prevents the circulating liquid above from entering the pipe. The flue gas flows upward and sequentially through several first through holes 405 and second through holes 51 respectively provided in the first packing mechanism 4 and the second packing disc 5. Due to the large number of gaps between the spherical packings, the flue gas will continuously come into contact with the liquid film on the surface of the packings during the flow of the flue gas through several spherical packings. At this time, harmful components in the flue gas, such as solid dust and acidic gases, will be transferred to the liquid phase through physical adsorption and chemical reaction, thereby achieving the removal of pollutants. During the removal process, a large amount of flue gas flows through the first-stage packing disc 401, while the remaining flue gas flows through the second-stage packing disc 402 and the third-stage packing disc 403. The first-stage packing disc 401 has the most spherical packings, while the third-stage packing disc 403 has the fewest, achieving the highest efficiency utilization.

[0061] Finally, the flue gas flows through the demister plate 17, which separates the liquid droplets entrained in the gas, achieving efficient recycling of the circulating liquid. The flue gas is discharged through the exhaust pipe 13, and the circulating liquid is recovered from the bottom collection pipe 12 and flows into the interior of the circulating liquid tank 201. The viewing window 16 is used to observe the working status inside the tower body 1, and can be used to maintain the tower body 1 after being opened.

[0062] Compared with related technologies, the high-temperature coal-fired furnace flue gas treatment equipment provided by the present invention has the following beneficial effects:

[0063] By setting the air inlet pipe 14 to exit below the primary packing disc 401, most of the flue gas flows through the primary packing disc 401, while the remaining flue gas flows through the secondary packing disc 402 and the tertiary packing disc 403 for auxiliary treatment. Finally, the flue gas is discharged after passing through the second packing disc 5 and the demister plate 17. This improves treatment efficiency, saves costs, and also improves purification efficiency to ensure compliance with emission standards. By setting the spray pipe 303 to spray the circulating liquid downwards, the liquid is ensured to evenly cover the surface of the spherical packing to form a liquid film. By setting the liquid collection pipe 12 to collect the circulating liquid to the circulating liquid tank 201, unnecessary consumption of reagents is reduced. By setting the baffle 21, the circulating liquid is prevented from entering the air inlet pipe 14.

[0064] Second Embodiment

[0065] Please refer to the following: Figures 9-18 Based on the high-temperature coal-fired boiler flue gas treatment equipment provided in the first embodiment of this application, the second embodiment of this application proposes another high-temperature coal-fired boiler flue gas treatment equipment. 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.

[0066] Specifically, the difference in the high-temperature coal furnace flue gas treatment equipment provided in the second embodiment of this application is that a cleaning mechanism 6 is connected to one side of each of the two electromagnetic tees 301. The cleaning mechanism 6 includes a clean water tank 601 and a clean water pipe 605. The two clean water pipes 605 are respectively connected to one side of the two electromagnetic tees 301. The clean water tank 601 is fixedly installed on the ground. A clean water tank cover plate 602 is provided on the top of the clean water tank 601. A clean water pump 603 is fixedly installed on the top of the clean water tank 601. The water pump 603's pumping end is connected to the inside of the clean water tank 601 through a pumping pipe. The water pump 603's outlet end is connected to a clean water main pipe 604. One side of the clean water main pipe 604 is connected to one end of each of the two clean water pipes 605.

[0067] A drive mechanism 7 is fixedly installed on one side of each of the two electromagnetic tees 301. The drive mechanism 7 includes a motor 701 and a gear 703. The motor 701 is fixedly installed on one side of the electromagnetic tee 301 through a housing. The output shaft of the motor 701 is fixedly connected to a gear 702. The gear 703 is fixedly installed on the surface of the connecting pipe 302. The gear 702 meshes with the gear 703.

[0068] A sealing mechanism 9 is fixedly installed at the bottom of the inner wall of each of the two spray pipes 303. The sealing mechanism 9 includes a fixing plate 901, which is fixedly installed at the bottom of the inner wall of the spray pipe 303. Both sides of the fixing plate 901 are fixedly connected to the connecting plate 903 by springs 902. A sealing plate 904 is fixedly installed on one side of each of the two connecting plates 903. One end of each sealing plate 904 passes through the inner wall of both ends of the spray pipe 303 and extends to the outside. An inclined plate 905 is fixedly installed at the end of each sealing plate 904 located outside the spray pipe 303. Several mating holes 906 are opened on the surface of each sealing plate 904.

[0069] The bottom of each of the two spray pipes 303 is provided with several water holes 18. The docking hole 906 is adapted to the water holes 18. One end of each of the two sealing plates 904 located below the second packing disc 5 is fixedly installed with a pusher plate 10. The inner wall of the tower body 1 is fixedly installed with two auxiliary annular plates 22. The two auxiliary annular plates 22 are adapted to the two inclined plates 905 located above the second packing disc 5.

[0070] A wall scraping mechanism 8 is fixedly installed on the inner wall of the tower body 1. The wall scraping mechanism 8 includes an annular guide trough 801, which is fixedly installed on the inner wall of the tower body 1. An annular damping groove 802 is slidably connected to the inner side of the annular guide trough 801 through two scrapers 803. The annular damping groove 802 is fixedly installed on the inner wall of the tower body 1. Two sewage outlets 804 are symmetrically opened at the bottom of the annular guide trough 801. Both sewage outlets 804 are connected to sewage collection tanks 19 through sewage outlet pipes 805. The two sewage collection tanks 19 are set on the ground. The push plate 10 is adapted to the scraper 803 and the two scrapers 803 are adapted to the tower body 1.

[0071] In actual use, the friction between the annular damping groove 802 and the scraper 803 is greater than the elastic force of the spring 902 and less than the thrust of the push plate 10, ensuring that the sealing plate 904 can connect with the clean water hole 18; the sludge collection tank 19 is cleaned regularly; and the docking hole 906 does not coincide with the clean water hole 18 when it is in its initial state.

[0072] The working principle of the high-temperature coal-fired gas treatment equipment provided in this embodiment is as follows:

[0073] First, during repeated use of the circulating liquid, as the amount of flue gas treated increases, solids from untreated flue gas will adhere to the inner wall of the tower body 1 located below the first packing mechanism 4, causing long-term corrosion of the tower body 1. At the same time, the hollow structure and surface pores of the spherical packing may be adhered to by impurities, dust particles, and solids in the circulating liquid. Long-term accumulation will lead to pore blockage, increase airflow resistance, and even affect the pressure balance inside the tower. At this time, the clean water pump 603 is started and the circulating pump 203 is shut down. Water is supplied to the two electromagnetic tees 301 through the clean water main pipe 604 and two clean water water pipes 605. The electromagnetic tees 301 are changed from discharging circulating liquid to discharging clean water. The two motors 701 on the upper and lower layers are started. The motors 701 drive the gear 1 702 to rotate. The gear 1 702 meshes with the gear 2 703. The gear 2 703 drives the spray pipe 303 to rotate.

[0074] Then, as the two spray pipes 303 rotate, the lower spray pipe 303 drives the two sealing plates 904 to rotate. The two sealing plates 904 drive the two inclined plates 905 and the two push plates 10 to move. When the inclined plates 905 contact the scraper 803, they push the sealing plates 904 inward, which is buffered by the spring 902. At this time, the docking hole 906 and the clean water hole 18 are docked, and clean water is sprayed vertically downward from the clean water hole 18 at the bottom. The sealing plate 904 continues to rotate with the spray pipe 303. After the docking is completed, the push plate 10 pushes the scraper 803 to rotate in a circular motion. The cleaning process removes impurities adhering to the inner wall of the tower body 1. After passing through the sewage outlet 804, the sewage is discharged into the sewage collection tank 19 via the sewage outlet pipe 805. The surrounding plate 404 prevents the spherical packing from moving to the secondary packing disc 402 during the scraping process of the scraper 803. At the same time, due to the spherical structure of the spherical packing, it completely fills the gap between the tertiary packing disc 403 and the tower body 1 without falling off. The upper spray pipe 303 also drives the closing plate 904 and the inclined plate 905 to rotate. The two inclined plates 905 here contact the two auxiliary annular plates 22, which also pushes the upper closing plate 904 to complete the docking.

[0075] Finally, the spray pipe 303 changes from spraying circulating liquid to spraying clean water vertically downwards. As the spray pipe 303 rotates, it cleans the attached materials from the spherical packing. After cleaning, the motor 701 reverses after resetting, causing the push plate 10 to disengage from the scraper 803. The spring 902 drives the sealing plate 904 to close the clean water hole 18, and the circulating liquid continues to be sprayed from the spray holes 304 on both sides.

[0076] Compared with related technologies, the high-temperature coal-fired furnace flue gas treatment equipment provided in this embodiment has the following beneficial effects:

[0077] Impurities in the untreated flue gas adhere to the inner wall of the tower body 1 below the first packing mechanism 4. By setting a motor 701 to drive the spray pipe 303 to rotate, the spherical packing on the first packing mechanism 4 and the second packing disc 5 is thoroughly cleaned. By setting the spray pipe 303 to rotate, the inclined plate 905 pushes the sealing plate 904 to connect with the clean water hole 18 to achieve precise opening and closing. By setting a push plate 10 to drive the scraper 803 to scrape the tower body 1 in a circular motion to remove impurities, the wastewater is discharged from the outlet 804 at the same time to avoid corrosion of the tower body 1. At the same time, clean water is sprayed vertically to remove impurities from the spherical packing. This achieves the simultaneous cleaning of impurities in the tower body 1 and the removal of attachments by the hydraulic penetration of the spherical packing, and the discharge of wastewater. This fundamentally solves the problem of blockage caused by impurities adhering to the packing and scale buildup on the inner wall of the tower body 1 during long-term operation of the circulating liquid, thereby ensuring that the flue gas is discharged in compliance with standards.

[0078] The ultra-efficient deep lithium extraction process from lepidolite includes the following steps;

[0079] Step S1: Mixing: Lithium mica and auxiliary materials are mixed in a certain proportion to obtain a mixture; wherein, the auxiliary materials are sodium sulfate, potassium sulfate, calcium sulfate, calcium carbonate, calcium hydroxide, calcium oxide, ferric sulfate, aluminum sulfate, ammonium sulfate, sulfuric acid or more.

[0080] Step S2: Grinding: Grind the mixture obtained in step S1 to a certain particle size to obtain a finely ground mixture;

[0081] Step S3: Calcination: The finely ground mixture obtained in step S2 is placed into a high-temperature coal furnace for high-temperature calcination at a temperature of 750-1000℃ for a reaction time of 2-10 minutes to obtain clinker. The flue gas generated after high-temperature calcination in the high-temperature coal furnace is fed into a high-temperature coal furnace flue gas treatment device for treatment before being discharged.

[0082] Step S4: Leaching: Leach the clinker obtained in step S3 and water at a ratio of 0.5-2:1 for 5-10 minutes to obtain leachate;

[0083] Step S5: Impurity Removal: Remove impurities from the leachate obtained in step S4. First, add ammonia, calcium oxide or caustic soda to the leachate to adjust the pH to 10-13. Then, add soda ash according to the amount of calcium. React for 20-120 minutes, with 0-30% excess soda ash. After filtration, obtain the purified solution.

[0084] Step S6: Concentration: The purified solution obtained in step S5 is concentrated to a lithium oxide concentration of 20-60 g / L to obtain a purified concentrated solution.

[0085] Step S7: Lithium Deposition: The purified concentrate obtained in Step S6 is subjected to lithium deposition. ① Soda ash solution is added to the purified concentrate, centrifuged, dried and packaged to obtain lithium carbonate product; ② Sodium hydroxide solution is added to the purified concentrate, and sodium sulfate is removed by freezing, concentrated, and lithium hydroxide is separated by centrifugation, dried, pulverized and packaged to obtain lithium hydroxide product; ③ Calcium chloride is added to the purified concentrate, calcium sulfate is removed by filtration, the resulting lithium chloride solution is concentrated to precipitate lithium chloride, dried and packaged to obtain lithium chloride product.

[0086] Compared with related technologies, the ultra-efficient deep lithium extraction process for lepidolite provided in this application has the following advantages:

[0087] This process achieves a lithium extraction rate of up to 98% from lepidolite, significantly improving the utilization rate of lepidolite resources, saving resources, and alleviating the lithium shortage problem. The high-temperature roasting period of this process is less than 10 minutes, which greatly increases the unit equipment capacity and significantly reduces the unit product energy consumption. This process has a simple production flow, low cost, stable product quality, and is easy to industrialize.

[0088] 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 high-temperature coal furnace flue gas treatment device, comprising a tower body, an air inlet pipe, a bottom tank communicated with the bottom of the tower body, a liquid collecting pipe communicated with the bottom of the bottom tank, an exhaust pipe communicated with the top of the tower body, the air outlet end of the air inlet pipe penetrating through the outer wall of the bottom tank and extending to the inside, four connecting columns fixedly installed at the top end of the air inlet pipe, the bottom of the bottom tank fixedly installed on the ground through three supporting columns, and two windows communicated with the outer wall of the tower body for observing and overhauling the tower body. Also includes: Circulation mechanism; A first packing mechanism is fixedly installed on the top of the four connecting columns. The first packing mechanism includes a primary packing disc, which is fixedly installed on the top of the four connecting columns. A secondary packing disc is fixedly installed on the top of the primary packing disc, and a tertiary packing disc is fixedly installed on the top of the secondary packing disc. A surrounding plate is fixedly installed on the top of the tertiary packing disc. Several first through holes are opened on the surfaces of the primary, secondary, and tertiary packing discs. The outlet end of the air inlet pipe is located below the primary packing disc. The second packing disc is fixedly installed on the inner wall of the tower body, and the surface of the second packing disc is provided with a plurality of second through holes; The two spraying mechanisms are respectively used to spray circulating liquid onto the top of the first packing mechanism and the second packing disc, and the circulation mechanism is used to supply circulating liquid to the two spraying mechanisms; The circulation mechanism is fixedly installed on the ground. The circulation mechanism includes a circulation tank, which is fixedly installed on the ground. A circulation tank cover is provided on the top of the circulation tank. A circulation pump is fixedly installed on the top of the circulation tank. The pump's pumping end is connected to the inside of the circulation tank through a pumping pipe. The pump's outlet end is connected to a main circulation pipe. Two circulation branch pipes are connected to one side of the main circulation pipe. The end of the collection pipe is connected to one side of the circulation tank. The two spraying mechanisms are respectively connected to the bottom ends of the two circulating liquid distribution pipes. Each spraying mechanism includes an electromagnetic tee, which is connected to the bottom end of the circulating liquid distribution pipe. The bottom end of the electromagnetic tee is connected to a connecting pipe, the top end of which is rotatably installed with the bottom end of the electromagnetic tee. The bottom end of the connecting pipe is connected to a spraying pipe, and several spraying holes are opened on both sides of the spraying pipe. The two spraying pipes are respectively adapted and installed to the first packing mechanism and the second packing disc. A cleaning mechanism is connected to one side of each of the two electromagnetic tees. The cleaning mechanism includes a clean water tank and clean water pipes. The two clean water pipes are connected to one side of each of the two electromagnetic tees. The clean water tank is fixedly installed on the ground. A clean water tank cover is provided on the top of the clean water tank. A clean water pump is fixedly installed on the top of the clean water tank. The water pump's pumping end is connected to the inside of the clean water tank through a pumping pipe. The water pump's outlet end is connected to a main clean water pipe. One side of the main clean water pipe is connected to one end of each of the two clean water pipes. A drive mechanism is fixedly installed on one side of each of the two electromagnetic tees. The drive mechanism includes a motor and a second gear. The motor is fixedly installed on one side of the electromagnetic tees through a housing. The output shaft of the motor is fixedly connected to a first gear. The second gear is fixedly installed on the surface of the connecting pipe. The first gear meshes with the second gear. The bottom of the inner wall of each of the two spray pipes is fixedly provided with a sealing mechanism, the sealing mechanism comprises a fixed plate fixedly installed on the bottom of the inner wall of the spray pipe, the two sides of the fixed plate are fixedly connected with connecting plates through springs, one side of each of the two connecting plates is fixedly provided with a sealing plate, one end of each of the two sealing plates penetrates through the inner wall of the two ends of the spray pipe and extends to the outside, and one end of each of the two sealing plates located outside the spray pipe is fixedly provided with an inclined plate. The bottom of each of the two spray pipes is provided with a plurality of clean water holes, the clean water holes are matched with the connecting holes, one end of each of the two sealing plates located below the second filler plate is fixedly provided with a pushing plate, and the inner wall of the tower body is fixedly provided with two auxiliary annular plates matched with the two inclined plates located above the second filler plate. The inner wall of the tower body is fixedly provided with a wall scraping mechanism, the wall scraping mechanism comprises an annular pollution guiding groove fixedly installed on the inner wall of the tower body, the inner side of the annular pollution guiding groove is slidingly connected with an annular damping groove through two scraping plates, the annular damping groove is fixedly installed on the inner wall of the tower body, the bottom of the annular pollution guiding groove is symmetrically provided with two pollution outlets, two pollution collecting tanks are communicated with the pollution outlets through pollution outlet pipes, the two pollution collecting tanks are arranged on the ground, the pushing plate is matched with the scraping plates, and the two scraping plates are matched with the tower body.

2. The high temperature coal fired flue gas treatment apparatus of claim 1, wherein, A shutter is fixedly installed between the four connecting columns, and a demisting plate is fixedly installed on the inner wall of the tower body.

3. The process for super-high efficiency deep lithium extraction from lepidolite, which needs to use the high-temperature coal-fired flue gas treatment equipment according to any one of claims 1-2, characterized in that, The method comprises the following steps. Step S1: mixing: mixing lithium mica and auxiliary materials in a certain proportion to obtain a mixture; wherein the auxiliary materials are one or more of sodium sulfate, potassium sulfate, calcium sulfate, calcium carbonate, calcium hydroxide, calcium oxide, iron sulfate, aluminum sulfate, ammonium sulfate, and sulfuric acid; Step S2: grinding: grinding the mixture obtained in step S1 to a certain particle size to obtain a finely ground mixture; Step S3: calcination: placing the finely ground mixture obtained in step S2 into a high-temperature coal furnace for high-temperature calcination, the calcination temperature is 750-1000℃, and the reaction time is 2-10 minutes, to obtain a clinker, and the flue gas generated by the combustion of coal after high-temperature calcination in the high-temperature coal furnace is discharged after being treated in a high-temperature coal furnace flue gas treatment device; Step S4: leaching: leaching the clinker obtained in step S3 with water in a ratio of 0.5-2:1, the leaching time is 5-10 minutes, to obtain a leaching solution; Step S5: impurity removal: removing impurities from the leaching solution obtained in step S4, first adding calcium oxide to the leaching solution to adjust the pH to 10-13, then adding soda ash according to the amount of calcium, and reacting for 20-120 minutes, wherein the excess of soda ash is 0-30%, and the purified solution is obtained after filtration; Step S6: concentration: concentrating the purified solution obtained in step S5 to a lithium oxide concentration of 20-60g / L to obtain a purified concentrated solution; Step S7: lithium precipitation: the purified concentrated solution obtained in step S6 is subjected to lithium precipitation, ①sodium carbonate solution is added to the purified concentrated solution, centrifugal separation is carried out, drying and packaging are performed, and lithium carbonate product is obtained; ②sodium hydroxide solution is added to the purified concentrated solution, sodium sulfate is removed by freezing, concentration is performed, lithium hydroxide is separated by centrifugal separation, drying and crushing are performed, and lithium hydroxide product is obtained; ③calcium chloride is added to the purified concentrated solution, calcium sulfate is removed by filtration, the obtained lithium chloride solution is concentrated to precipitate lithium chloride, drying and packaging are performed, and lithium chloride product is obtained.

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