Novel lithium ore clinker cooling device and heat recovery system

Abstract

The invention discloses a novel lithium ore clinker cooling device and heat recovery system, the cooling device comprises a blanking bin with a discharge port and a surge bin with a feed port, a material passing bin is arranged between the surge bin and the blanking bin, and a material pushing plate is mounted in the material passing bin; wherein the pushing plate obliquely extends, one end, close to the buffering bin, of the pushing plate is higher than one end, close to the discharging bin, of the pushing plate, the pushing plate is connected with an excitation system and comprises a pore plate section and a sealing section, the pore plate section is located below the buffering bin and comprises an upper pore plate and a lower pore plate, and the pore diameter of the upper pore plate is smaller than that of the lower pore plate; a heat dissipation interlayer is further arranged between the upper hole plate and the lower hole plate, the bottom of the lower hole plate is connected with an air pipe with holes, an air outlet of the air pipe with holes faces the lower hole plate, and an air blowing assembly blowing air towards the discharging bin is further installed on the outer wall of the lower side of the material pushing plate. The structure is simple and maintenance is convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of lithium ore clinker cooling, and in particular relates to a novel lithium ore clinker cooling device and a heat recovery system. Background Art

[0002] Lithium ore is a common raw material for lithium extraction in lithium salt plants. After high-temperature roasting, lithium ore clinker usually enters a cooling device to cool to below 150°C before entering the next process. Due to the plunge in lithium salt prices, lithium salt plants have begun to pay attention to the calorific value recovery of high-temperature lithium ore clinker. Grate coolers are common cooling devices in lithium salt plants, and can be used in conjunction with flue gas boilers to recover the calorific value of lithium ore clinker. Theoretically, the designed heat recovery efficiency of the grate cooler can reach 75%, but the operating power is also as high as 700KW. In actual production, it is difficult to control the distribution and thickness of the high-temperature clinker inside the grate cooler, and the cooling air is also difficult to fully cool the high-temperature clinker of each particle size. Especially when the "Red River" phenomenon occurs, it is difficult for the discharge temperature to meet the design requirements, and the heat recovery rate is also difficult to reach the design value;

[0003] To solve the above problems, at present, there is a Chinese invention patent CN117739691A, which discloses an oxygen-free cooling device for high-temperature roasted clinker. The device is based on fluidized cooling technology and uses circulating nitrogen fluid to achieve oxygen-free heat exchange with high-temperature clinker. The fluidized cooling chamber of the device is a U-shaped structure, and nitrogen is input into four chambers by a pressure pump, so that the high-temperature clinker moves in the chamber to cool down. However, there are problems that roasted clinker agglomerates and blocks the cooling chamber, and the pressure pump blows nitrogen to fail to achieve fluidized heat exchange.

[0004] Another example is Chinese invention patent CN118328718A, which discloses a step-by-step cooling grate cooler for multi-powder working conditions. The device is provided with two upper and lower cooling parts on the basis of a conventional grate cooler. The cooling and heat utilization of high-temperature clinker with multiple particle sizes are achieved through the modification, but the operating energy consumption of the device is also increased.

[0005] The existing high-temperature material cooling device has problems such as high energy consumption, unstable cooling effect and unsatisfactory calorific value recovery rate. Based on this, a new lithium ore clinker cooling device and heat recovery system are proposed. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a novel lithium ore clinker cooling device and heat recovery system. In the cooling device, clinker of different particle sizes arrives at the push plate from the buffer bin, and clinker with a particle size not exceeding the aperture of the upper orifice plate enters the heat dissipation interlayer from the upper orifice plate, passes through the lower orifice plate, and arrives at the lower side of the push plate, and is blown to the lower bin under the action of the blowing component. In this process, the cold air sprayed from the perforated air duct passes upward through the lower orifice plate, the heat dissipation interlayer and the upper orifice plate after being heated, so as to realize the counter-heat exchange cooling with the small-particle clinker. In addition, the normal temperature gas blown out by the blowing component can also perform secondary cooling on the small-particle clinker. The cooling air first cools the small-particle clinker with a particle size smaller than the aperture of the upper orifice plate, and then cools the large-particle clinker on the push plate. The calorific value of the small-particle clinker is lower than that of the large-particle clinker, so that the cooling air receives more heat in the process of heating and rising, and the cooling effect is good, which greatly improves the calorific value recovery of the cooling device and avoids thermal shock to the next process.

[0007] The object of the present invention is achieved through the following technical solutions:

[0008] A novel lithium ore clinker cooling device comprises a lower material bin with a discharge port and a buffer bin with a feed port, a feed bin is arranged between the buffer bin and the lower material bin, and a push plate is installed in the feed bin;

[0009] Among them, the push plate extends obliquely, and one end of the push plate close to the buffer bin is higher than the end close to the lower bin, the push plate is connected to the excitation system, the push plate includes a perforated plate section and a sealing section, the orifice plate section is located below the buffer bin, the orifice plate section includes an upper orifice plate and a lower orifice plate, the aperture of the upper orifice plate is smaller than the aperture of the lower orifice plate, a heat dissipation interlayer is also arranged between the upper orifice plate and the lower orifice plate, the bottom of the lower orifice plate is connected to a perforated air duct, the air outlet of the perforated air duct faces the lower orifice plate, and a blowing component for blowing air toward the lower bin is also installed on the outer wall located at the lower side of the push plate.

[0010] In one embodiment, one end of the push plate is connected to the fixed support through a connecting beam, the connecting beam passes through the outer wall hole, a sealing member fixed to the outer wall is provided at the outer wall hole, the sealing member is connected to the connecting beam, an air supply pipe connected to the air duct with holes is installed in the connecting beam, and the air supply pipe is connected to a wind source;

[0011] Through this embodiment, the fixed support and the connecting beam are used for positioning and rotational displacement of the push plate, and at the same time, the active sealing member is used for sealing.

[0012] In one embodiment, the push plate includes a longitudinal frame and a transverse frame arranged alternately, the connecting beam is connected to one end of the longitudinal frame, and the longitudinal frame is connected to the excitation system through a rotating connecting member;

[0013] Through this implementation, the push plate's skeleton is formed by staggered longitudinal and transverse skeletons to ensure the push plate's stability and strength when receiving clinker. The push plate is connected to the vibration system via a rotating connector, and the vibration system is used to transmit the excitation force to the push plate. In combination with the inclined push plate, the clinker's own gravity and the vibration force are used to move the material.

[0014] In one embodiment, the excitation system includes a hydraulic exciter and an excitation main column connected to the hydraulic exciter, an excitation crossbeam is installed on the excitation main column, and a plurality of excitation secondary columns connected to the longitudinal frame are arranged on the excitation crossbeam;

[0015] In one embodiment, the bottom limit of the push plate is located at the top of multiple vertical pillars, and the blowing assembly includes a first air cannon located on the outer wall of one side of the push plate and a second air cannon located on the outer wall of the bottom of the push plate. The blowing directions of the first air cannon and the second air cannon are both toward the lower bin, and the nozzle of the blowing assembly is arranged to avoid the vertical pillars. An angle steel block is provided on the back of the second air cannon nozzle, and the angle steel block is perpendicular to the second air cannon nozzle;

[0016] Through this embodiment, after the small particles of clinker are blown up by multiple second air cannons at the bottom of the push plate, the first air cannon located on the outer wall of one side of the push plate is directly blown toward the lower silo. At this time, the first air cannon can also clean the clinker particles accumulated on the push plate, and the angle steel block arranged on the back of the second air cannon nozzle can avoid nozzle wear and increase the service life of the blowing component.

[0017] In one embodiment, a baffle plate corresponding to the air outlet position of the perforated air duct is also installed at the bottom of the lower perforated plate, and the baffle plate includes a fixed plate connected to the lower perforated plate and baffles arranged on both sides of the fixed plate, and the baffle completely covers the air outlet of the perforated air duct;

[0018] Through this embodiment, the air outlet of the perforated air duct faces the lower perforated plate to achieve counter heat exchange cooling with the small particle clinker, and the baffle plate arranged between the lower perforated plate and the perforated air duct can effectively prevent the clinker particles from entering the perforated air duct.

[0019] In one embodiment, it also includes a smoke bin and a steam bin, the buffer bin, the smoke bin and the steam bin are arranged adjacent to each other, and the smoke bin and the buffer bin are located above the orifice plate section of the push plate, the steam bin is located above the sealing section of the push plate close to the lower bin, the buffer bin and the lower bin are respectively provided with a primary roller crushing assembly and a secondary roller crushing assembly, and a movable cover plate is also provided on the bin wall between the buffer bin and the smoke bin, and the movable cover plate is hinged to the inner wall of the smoke bin;

[0020] Through this embodiment, the buffer bin, the smoke bin and the steam bin are arranged adjacent to each other, the feed port of the buffer bin is connected to the discharge port of the transformation kiln, the high-temperature smoke generated by the clinker particles during the air cooling process is collected and recovered through the smoke bin, and the low-pressure steam generated by the water cooling system is collected and recovered through the steam bin, thereby improving the heat recovery efficiency of the device. The movable cover plate arranged between the buffer bin and the smoke bin can be opened when the primary roller crushing component works abnormally or the clinker discharge surges, resulting in excessive accumulation of clinker, so as to discharge part of the clinker to the transfer bin.

[0021] In one embodiment, a water cooling component and a filter component are provided in the steam bin, the water cooling component includes a horizontal beam and a water pipe provided on the horizontal beam, a multi-stage spray head is provided on the side of the water pipe facing the push plate, the filter component is provided above the water cooling component, and the filter component includes a partition plate and a filtering and cleaning device provided in the partition plate;

[0022] Through this embodiment, the water cooling component is used to cool the large-particle high-temperature clinker on the push plate and the secondary roller crushing component. The cooling water is condensed water at 50 to 70°C to avoid over-cooling of the generated steam. The multi-stage spray heads arranged have a reduced amount of water sprayed from front to back to ensure the cooling effect of the large-particle clinker and the dryness of the clinker. The water cooling component and the filter component are also used to reduce the escape of water vapor carrying clinker due to the violent reaction of water cooling. The steam bin is located above the sealing section on the side of the push plate close to the lower bin, and the low-pressure steam generated by the water cooling of the clinker is collected and recovered through the steam bin.

[0023] The present invention also provides a novel lithium ore clinker heat recovery system, comprising the above-mentioned cooling device, and also comprising a cyclone dust collecting device and a waste heat boiler connected in sequence to the cooling device, wherein the cooling device is also connected to a low-pressure steam cleaner, and the low-pressure steam cleaner is connected to the MVR forced evaporator via a steam compressor;

[0024] In one embodiment, one end of the cyclone dust collector is connected to the fume bin of the cooling device, the bottom of the cyclone dust collector is connected to the lower bin of the cooling device, and the low-pressure steam cleaner is connected to the steam bin of the cooling device;

[0025] Through this implementation, first, the cooling air is used to contact and cool the clinker at nearly 1000°C, and the cooling gas and the material are heated up in turn and are sucked out from the flue gas outlet on the top of the flue gas bin. The high-temperature flue gas is successively recovered through the cyclone dust collector and the waste heat boiler for heat energy recovery. After the clinker is air-cooled, it is contacted with condensed water in the sealing area at the rear of the push plate for cooling. The generated low-pressure steam enters the MVR forced evaporator after preliminary cleaning of the steam bin water cooling component and the filter component, deep cleaning of the cleaner, and compression and heating of the steam compressor. The raw steam at about 150°C generated by the waste heat boiler and the low-pressure steam directly generated by the cooling device are used together as the evaporation medium of the MVR forced evaporator, which further reduces the dependence of the lithium salt plant on external steam and achieves the purpose of controlling costs and improving production efficiency.

[0026] The beneficial effects of the present invention are:

[0027] The push plate is used to screen the clinker of different particle sizes. The clinker with a particle size not exceeding the aperture of the upper orifice plate enters the heat dissipation interlayer from the upper orifice plate, passes through the lower orifice plate, and reaches the lower side of the push plate. It is blown to the lower silo under the action of the blowing component. In this process, the cold air sprayed out of the perforated air duct is heated and passes upward through the lower orifice plate, the heat dissipation interlayer and the upper orifice plate to achieve counter-heat exchange cooling with the small-particle clinker. In addition, the normal temperature gas blown out by the blowing component can also perform secondary cooling on the small-particle clinker. The cooling air first cools the small-particle clinker with a particle size smaller than the aperture of the upper orifice plate, and then cools the large-particle clinker on the push plate. The calorific value of the small-particle clinker is lower than that of the large-particle clinker, so that the cooling air receives more heat in the process of heating and rising, which greatly improves the calorific value recovery of the cooling device, has a small operating power, and has obvious energy-saving and consumption-reducing effects. It has a simple structure, is easy to maintain, and avoids thermal shock to the next process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0029] Figure 1 A schematic diagram showing the structure of the cooling device of the present invention is shown;

[0030] Figure 2 A schematic diagram showing the structure of the heat recovery system of the present invention is shown;

[0031] Figure 3 A schematic diagram showing the connection structure between the push plate and the excitation system of the present invention is shown;

[0032] Figure 4 A schematic diagram (top view) of the structure of the pusher plate of the present invention is shown;

[0033] Figure 5 A schematic diagram showing the structure of the water cooling assembly of the present invention is shown;

[0034] Figure 6A schematic diagram (top view) of the structure of the filtering and cleaning device of the present invention is shown;

[0035] Figure 7 A schematic diagram (sectional view) of the structure of the filtering and cleaning device of the present invention is shown;

[0036] In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale.

[0037] Reference numerals:

[0038] 100-Cooling device, 1-Buffer bin, 2-Under-feeding bin, 3-Over-feeding bin, 4-Flue gas bin, 5-Steam bin, 6-Pushing plate, 7-Perforated air duct, 8-Excitation system, 9-First air cannon, 10-Second air cannon, 11-Outer wall, 12-Fixed support, 13-Connecting beam, 14-Cyclone dust collector, 15-Waste heat boiler, 16-Horizontal beam, 17-Multi-stage spray head, 18-Filtration and cleaning equipment, 19-MVR forced evaporator, 20-Ball mill, 21-Low-pressure steam cleaner, 22-Seal, 23-Vertical support, 24-Angle steel block, 25-Main water pipe, 26-Horizontal water pipe, 27-Longitudinal water pipe, 28-Primary roller crushing assembly, 29-Secondary roller crushing assembly, 30-Movable cover, 31-Furnace bridge, 32-Steam compressor, 33-Safety valve, 34-Evacuation pipe, 35-Spare Steam outlet, 36-gas detector, 37-check valve, 38-level meter, 39-sheath, 40-thermometer, 41-first pressure thermometer, 42-second pressure thermometer, 43-control valve, 44-window, 45-inspection hole, 601-upper orifice plate, 602-heat dissipation interlayer, 603-lower orifice plate, 604-blocking plate, 605-rib, 606-longitudinal back rib, 607-transverse back rib , 608-transverse frame, 609-longitudinal frame, 701-longitudinal air duct, 702-transverse air duct, 801-hydraulic vibrator, 802-vibration beam, 803-vibration secondary column, 804-rotating connection, 1801-first screw, 1802-actuator, 1803-cleaning head, 1804-second screw, 1805-upper wire mesh, 1806-lower wire mesh, 1807-hollow track. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the accompanying drawings.

[0040] The present invention provides a novel lithium ore clinker cooling device, wherein a cooling device 100 is provided with a feed port connected to a discharging port of a transformation kiln, and the discharging port of the cooling device 100 is connected to a feed port of a ball mill 20, and the cooling device 100 comprises a buffer bin 1, a feeding bin 3, a fume bin 4, a steam bin 5, a feeding bin 2, and an outer wall 11 and an inner wall constituting each sub-bin;

[0041] Specifically, Figure 1 As shown, a push plate 6 is installed in the material bin 3;

[0042] Among them, the push plate 6 extends obliquely, and the end of the push plate 6 close to the buffer bin 1 is higher than the end close to the lower bin 2. The push plate 6 is connected to the excitation system 8. The push plate 6 includes a perforated plate section and a sealing section. The perforated plate section is located below the buffer bin 1. The perforated plate section includes an upper perforated plate 601 and a lower perforated plate 603. The aperture of the upper perforated plate 601 is smaller than the aperture of the lower perforated plate 603. A heat dissipation interlayer 602 is also provided between the upper perforated plate 601 and the lower perforated plate 603. The bottom of the lower perforated plate 603 is connected to a perforated air duct 7, and the air outlet of the perforated air duct 7 faces the lower perforated plate 603. A blowing component for blowing air toward the lower bin 2 is also installed between the outer wall 11 located at the lower side of the push plate 6;

[0043] It should be noted that, in the present embodiment, the push plate 6 is used to screen the clinkers of different particle sizes. The clinkers whose particle sizes do not exceed the aperture of the upper orifice plate 601 enter the heat dissipation interlayer 602 from the upper orifice plate 601, pass through the lower orifice plate 603, and reach the lower side of the push plate 6. Under the action of the blowing component, they are blown to the lower silo 2. In this process, the cold air of the perforated air duct 7 passes upward through the lower orifice plate 603, the heat dissipation interlayer 602 and the upper orifice plate 601 after being heated, so as to achieve heat exchange cooling with the small-particle clinker. In addition, the normal temperature gas blown out by the blowing component can also perform secondary cooling on the small-particle clinker. The cooling air first cools the small-particle clinker whose particle size is smaller than the aperture of the upper orifice plate 601, and then cools the large-particle clinker on the push plate 6. The calorific value of the small-particle clinker is lower than that of the large-particle clinker, so that the cooling air receives more heat in the process of being heated and rising, which greatly improves the calorific value recovery of the cooling device 100, saves energy and reduces costs, and avoids thermal shock to the next process.

[0044] Specifically, the orifice plate section includes an upper orifice plate 601 with an aperture of 23 mm and a lower orifice plate 603 with an aperture of 25 mm, so as to avoid blocking the heat dissipation interlayer 602 and the lower orifice plate 603. The heat dissipation interlayer 602 between the upper orifice plate 601 and the lower orifice plate 603 is composed of a vertical metal plate with a gap of 25 mm. Figure 1 As shown, the blowing assembly includes a first air cannon 9 located on the outer wall 11 on one side of the push plate 6 and a second air cannon 10 located on the outer wall 11 at the bottom of the push plate 6. The blowing directions of the first air cannon 9 and the second air cannon 10 are both toward the lower bin 2. The nozzle of the second air cannon 10 is arranged in an interval to avoid the vertical support 23. An angle steel block 24 is arranged on the back of the nozzle of the second air cannon 10. The angle steel block 24 is perpendicular to the nozzle of the second air cannon 10. The angle steel block 24 can protect the nozzle of the second air cannon 10 and reduce its wear. The material of the sealing section includes heat-resistant and shock-resistant metal or non-metallic material, such as fiber-reinforced high-temperature ceramic-based composite materials and 800°C resistant super-strong aluminum alloys.

[0045] Furthermore, the buffer bin 1, the fume bin 4 and the steam bin 5 are arranged adjacent to each other, and the fume bin 4 and the buffer bin 1 are both located above the orifice section of the push plate 6, and the steam bin 5 is located above the sealing section of the push plate 6 on the side close to the lower bin 2. The buffer bin 1 and the lower bin 2 are respectively provided with a primary roller crushing assembly 28 and a secondary roller crushing assembly 29, and a furnace bridge 31 is arranged at the discharge port of the transformation kiln to prevent large-sized lithium ore from sintering and directly entering the cooling device 100, causing large sintered blocks to get stuck in the primary roller crushing assembly 28. The discharge gap of the furnace bridge 31 is 200*200mm, and a level meter 38 is arranged in the buffer bin 1. The primary roller crushing assembly 28 It is arranged at the lower side of the buffer bin 1. The discharge particle size of the primary roller crushing assembly 28 does not exceed 30mm, which ensures the cooling quality of the lithium ore clinker and the existence of the minimum material level. The push plate 6 is used for screening the clinker coming out of the buffer bin 1 to improve the efficiency, air cooling and transportation of the secondary roller crushing assembly 29. A movable cover plate 30 is also provided on the bin wall between the buffer bin 1 and the smoke bin 4. The movable cover plate 30 is hinged to the inner wall of the smoke bin 4, that is, the high-temperature smoke generated by the clinker particles during the air cooling process is collected and recovered through the smoke bin 4, and the low-pressure steam generated under the action of the water cooling system is collected and recovered through the steam bin 5, which improves the heat recovery efficiency of the device;

[0046] It should be noted that the temperature of the lithium ore entering the cooling device 100 after the lithium concentrate is burned in the transformation kiln can reach about 1100°C. During the roasting process, the lithium concentrate will produce large and small sintered blocks. Large sintered blocks, such as sintered blocks with a particle size of more than 200 mm, are filtered out on the furnace bridge 31, and clinker of other particle sizes enters the buffer bin 1 of the cooling device 100. A level meter 38 is provided in the buffer bin 1 to monitor the height of the clinker in the buffer bin 1, and is associated with the primary roller crushing component 28 to control the highest material and the lowest material. The level meter 38 adjusts the frequency of the primary roller crushing component 28 to control the height of the clinker. At the same time, the level meter 38 can also achieve The sealing of the cooling device 100 prevents the high-temperature flue gas from running into the front-end transformation kiln, and also prevents the adverse flue gas in the transformation kiln from entering the cooling device 100. The clinker is crushed to less than 30 mm by the primary roller crushing assembly 28 and falls onto the push plate 6 of the hopper 3. Under the action of the hydraulic excitation system 8, the clinker is guided by the push plate 6, screened and air-cooled in the filter area, and water-cooled in the sealing area of ​​the push plate 6 near the lower hopper 2, so that the clinker is cooled from about 1000°C to about 100°C. The cooling air rises to the upper part of the flue gas hopper 4 after heat exchange with the clinker. The cooling air can also take away the CO in the clinker to avoid the water vapor reaction during the water cooling process to produce hydrogen:

[0047]

[0048] That is, after the small particles of clinker are blown up by the multiple second air cannons 10 at the bottom of the push plate 6, the first air cannon 9 located on the outer wall 11 of one side of the push plate 6 is directly blown to the lower silo 2. At this time, the first air cannon 9 can also clean the clinker particles accumulated on the push plate 6, and the angle steel block 24 set on the back of the nozzle of the second air cannon 10 can avoid nozzle wear and improve the service life of the blowing component. That is, clinker of nearly 1000°C with different particle sizes reaches the push plate 6 from the buffer zone, and the material with a particle size not exceeding 23mm enters the heat dissipation interlayer 602 from the upper perforated plate 601 and then passes through the lower perforated plate 603 to reach The lower side of the push plate 6 is then blown to the lower silo 2 by the blowing assembly. In this process, the cold air from the perforated air duct 7 is heated and passes upward through the lower perforated plate 603, the heat dissipation interlayer 602 and the upper perforated plate 601 to achieve heat exchange cooling with the small particles. In addition, the blowing assembly blows out normal temperature gas to perform secondary cooling on the small particles, and finally achieves the cooling target of the clinker of the small particles, that is, below 85°C, and the initial cooling of the coarse material on the push plate 6, that is, below 600°C. The heat exchange modes between air and clinker include heat conduction, heat convection and heat radiation, among which heat convection is dominant. According to Newton's cooling law:

[0049] Q = hA (T1-T2) = mcΔT, which can be approximately described as the temperature rise of the cooling air ΔT exceeding 500°C. The heat value recovery of the cooling device 100 is nearly 60% higher than the existing grate cooler waste heat flue gas extreme value of 350°C.

[0050] The secondary roller crushing assembly 29 can control the coarse clinker particles to be less than 25 mm. The material is cooled by contact with condensed water. Under the exciting force of the push plate 6 and the turning of the secondary roller crushing assembly 29, the large clinker particles are evenly contacted with the condensed water. By controlling the spraying amount of the multi-stage spray head 17, the temperature of the large clinker particles can be heat-exchanged to about 85°C, dried, and the overall particle size does not exceed 25 mm.

[0051] Specifically, Figure 4 As shown, one end of the push plate 6 is connected to the fixed support 12 through a connecting beam 13, and the connecting beam 13 passes through the hole of the outer wall 11. A sealing member 22 fixed to the outer wall 11 is provided at the hole of the outer wall 11, and the sealing member 22 is connected to the connecting beam 13. An air supply pipe connected to the air duct 7 with holes is installed in the connecting beam 13, and the air supply pipe is connected to a wind source, that is, the fixed support 12 and the connecting beam 13 are used for positioning and rotation displacement of the push plate 6, and at the same time, the active sealing member 22 is used for blocking. The material of the sealing member 22 can be high-temperature alloy material, Meirun high-temperature resistant silicone soft connection, aluminum silicate material, nano-microporous thermal insulation material, glass fiber material, etc. The sealing member 22 has a soft skeleton, which is active and fixed to the outer wall 11 by bolts;

[0052] In this embodiment, the clinker is first air-cooled and then water-cooled to avoid direct contact between high-temperature materials and condensed water, which may cause violent reactions and increase safety risks, and ensure that the air pressure in the warehouse is lower than 0.3MPa. A safety valve 33 and an exhaust pipe 34 are provided on the side of the steam warehouse 5 away from the smoke warehouse 4. The safety valve 33 can prevent water from violently reacting with high-temperature materials to form a high-pressure space in the cooling device, thereby reducing risks. A spare steam outlet 35 is also provided on the side of the steam warehouse 5 away from the smoke warehouse 4. The spare steam outlet 35 is located above the safety valve 33. The spare steam outlet 35 can also be used as a decompression channel for the cooling device 100, forming multiple protections and reducing risks. A gas detector 36 is also provided on the top of the steam warehouse 4. Due to the inconsistent aluminum content in different batches of lithium ore, excessive aluminum content may cause aluminum-water reaction to produce hydrogen explosion. The gas detector 36 is provided to monitor the content of hydrogen and oxygen generated by the contact reaction between the lithium ore clinker and water in real time to avoid the hydrogen content exceeding 4% and the oxygen content exceeding 2%. The content of each element in the lithium concentrate is shown in Table 1 below:

[0053] Table 1.Elemental composition of concentrate determined by XRF andICP-OES.

[0054]

[0055] Alumina basically does not react with water to produce hydrogen below 900°C:

[0056] Alumina will prevent hydrogen generation. If hydrogen is detected, CrK(SO4)2·12H2O solution can be used to suppress hydrogen generation. This solution can be added to the multi-stage spray head 17;

[0057] Furthermore, a check valve 37 is provided on the smoke pipe between the smoke outlet of the smoke bin 4 and the cyclone dust collecting device 14, and the check valve 37 is used to prevent steam from returning to the smoke bin 4 through the smoke pipe. A window 44 and an inspection hole 45 are also provided on the outer wall of the steam bin 5 for monitoring and maintenance. A temperature measuring instrument 40 is provided on the outer wall 11 at the lower side of the secondary roller crushing assembly 29, and is used to detect the temperature of the clinker after air cooling and water cooling, and feed it back to the air cooling and water cooling system to achieve dynamic control;

[0058] Specifically, a first pressure thermometer 41 is further provided on the flue gas pipe between the flue gas outlet of the flue gas bin 4 and the cyclone dust collecting device 14, so as to control the cyclone dust collecting device 14 according to the detection information of the first pressure thermometer 41, so as to avoid the blockage of the flue gas outlet of the flue gas bin 4. The thermometer 40 is located on both sides of the top of the lower silo 2, and the temperature of the materials above and below the push plate 6 is measured respectively, that is, the temperature information of the two thermometers 40 is obtained in real time. For example, when any one of the thermometers 40 detects that the temperature exceeds the preset temperature, the air intake of the perforated air duct 7 can be increased and / or the frequency of the water supply pump can be increased to reduce the temperature of the material;

[0059] In one embodiment, Figure 3 As shown, the excitation system 8 includes a hydraulic exciter 801 and an excitation main column connected to the hydraulic exciter 801, an excitation crossbeam 802 is installed on the excitation main column, and a plurality of excitation sub-columns 803 connected to the longitudinal skeleton 609 are arranged on the excitation crossbeam 802. The action displacement of the hydraulic exciter 801 is 5 to 20 mm to ensure the durability of the push plate 6. A sheath 39 is arranged at the connection between the excitation sub-column 803 and the outer wall 11 to avoid leakage and wear of the excitation sub-column 803.

[0060] In one embodiment, Figure 4 As shown, a longitudinal air duct 701 is provided inside the connecting beam 13, which is used to supply air to the transverse air duct 702 and the parallel perforated air duct 7, and the frame includes a longitudinal frame 609 and a transverse frame 608, which are cross-arranged to strengthen the integrity and bearing capacity of the push plate 6, and the longitudinal frame 609 can be placed on the top of the vertical support 23;

[0061] In one embodiment, Figure 3 As shown, a baffle plate 604 corresponding to the air outlet position of the perforated air duct 7 is also installed at the bottom of the lower perforated plate 603, and the baffle plate 604 includes a fixed plate connected to the lower perforated plate 603 and baffles arranged on both sides of the fixed plate, and the baffle completely covers the air outlet of the perforated air duct 7, that is, the air outlet of the perforated air duct 7 faces the lower perforated plate 603, so as to achieve counter heat exchange cooling with the small particle clinker, and the baffle plate 604 arranged between the lower perforated plate 603 and the perforated air duct 7 can effectively prevent the clinker particles from entering the perforated air duct 7;

[0062] In one embodiment, Figures 5 to 7As shown, the steam bin 5 is located above the sealing section of the push plate 6, and a water cooling component and a filtering component are arranged therein. The water cooling component includes a horizontal beam 16 and a water pipe arranged on the horizontal beam 16. A multi-stage spray head 17 is arranged on the side of the water pipe facing the push plate 6. The filtering component is arranged above the water cooling component. The filtering component includes a partition plate and a filtering and cleaning device 18 arranged in the partition plate. The water cooling component is used to cool the large-particle high-temperature clinker on the push plate 6 and the secondary roller crushing component 29. The cooling water is condensed water at 50 to 70°C to avoid excessive cooling of the generated steam. The water spraying amount of the multi-stage spray head 17 is reduced from front to back in sequence to ensure the cooling effect of the large-particle clinker and the dryness of the clinker. The water cooling component and the filtering component can also be used to reduce the escape of clinker carried by water vapor generated by the violent reaction of water cooling. The steam bin 5 is located above the sealing section of the push plate 6 close to the lower bin 2. The low-pressure steam generated by the water cooling of the clinker is collected and recycled through the steam bin 5.

[0063] Specifically, Figure 5 As shown, the water cooling assembly includes a water pipe, a multi-stage spray head 17 and a horizontal beam 16. The cooling water of the water cooling assembly is condensed water at 50-70°C to prevent the generated steam from being overcooled. The water pipe includes a longitudinal water pipe 27, a transverse water pipe 26, and a main water pipe 25. The longitudinal water pipes 27 are arranged side by side with a spacing of 500mm and a spacing of 1m from the inner wall to reduce the steam being fully covered by the condensed water for cooling and to reserve a maintenance corridor. The water spraying amount of the multi-stage spray head 17 can be adjusted according to the data feedback of the temperature meter 40 at the bottom of the secondary roller crushing assembly 29;

[0064] Furthermore, the range of the push plate 6 covered by the multi-stage spray head 17 is the sealing section of the push plate 6 close to the lower bin 2, and the horizontal beam 16 is the supporting structure of the water cooling component. Figure 6 and Figure 7As shown, the filter assembly includes a partition plate and a filter and cleaning device 18 arranged in the partition plate. The partition plate is a refractory horizontal plate connecting the inner and outer walls 11 in the steam bin 5. The width of the filter and cleaning device 18 between the refractory horizontal plates is 350 mm to avoid high-temperature deformation of the filter and cleaning device 18 due to excessive width. The filter and cleaning device 18 is arranged horizontally in 3 rows, and the number of the filter and cleaning devices 18 can also be adjusted according to the amount of steam. The filter and cleaning device 18 is composed of an upper wire mesh 1805, a hollow track 1807 and a lower wire mesh 1806. The pores of the upper wire mesh 1805 are 5 mm, and the pores of the lower wire mesh 1806 are 10 mm, so that the low-pressure steam can move from bottom to top. The filter and cleaning device 18 also includes a cleaning device. The head 1803, the first screw 1801, the second screw 1804 and the actuator 1802, after receiving the feedback data from the second pressure thermometer 42 at the steam outlet and the spare steam outlet 35, the multi-channel cleaning system operates in sequence. During operation, the control valve 43 connected to the steam outlet is closed, and the control valve 43 connected to the spare steam outlet 35 is opened to prevent the cleaned clinker from entering the steam outlet pipe, thereby reducing the load of the cleaner. The cleaned clinker is sent to the cyclone dust collecting device 14 from the spare steam outlet 35. The reciprocating cleaning action of the cleaning head 1803 is completed by the actuator 1802 driving the first screw 1801 and the second screw 1804. The super-strong aluminum alloy resistant to 500°C can be selected as the material of the cleaning head;

[0065] The present invention also provides a novel lithium ore clinker heat recovery system, such as Figure 2 As shown, the cooling device 100 includes the above-mentioned cooling device 100, and also includes a cyclone dust collector 14 and a waste heat boiler 15 connected in sequence with the cooling device 100. The cooling device 100 is also connected with a low-pressure steam cleaner 21, and the low-pressure steam cleaner 21 is connected to the MVR forced evaporator 19 via a steam compressor 32. One end of the cyclone dust collector 14 is connected to the smoke bin 4 of the cooling device 100, and the bottom of the cyclone dust collector 14 is connected to the lower bin 2 of the cooling device 100. The low-pressure steam cleaner 21 is connected to the steam bin 5 of the cooling device 100;

[0066] That is, the cooling air is used to contact and cool the clinker at nearly 1000℃. The cooling gas and the material are heated up in turn and are sucked out from the flue gas outlet on the top of the flue gas bin 4. The high-temperature flue gas is successively passed through the cyclone dust collector 14 and the waste heat boiler 15 for heat energy recovery, and then discharged through the chimney after the metal bag dust collector. After the clinker is air-cooled, it is contacted with condensed water in the sealing area at the tail of the push plate 6 to cool down. The condensed water at 50-70℃ reacts violently with the large-particle clinker at nearly 600℃ to produce superheated steam. During the intense evaporation process, the air pressure in the bin is 0.10-0.15MPa, and the maximum temperature of the superheated steam can reach nearly 150℃. After water cooling, the superheated steam is close to the saturated steam at about 100°C under the air pressure. The generated low-pressure steam enters the MVR forced evaporator 19 after preliminary cleaning of the water cooling component and the filter component of the steam bin 5, deep cleaning of the cleaner, and compression and heating of the steam compressor. The raw steam at about 150°C generated by the waste heat boiler 15 and the low-pressure steam directly generated by the cooling device 100 are used as the evaporation medium of the MVR forced evaporator 19, and can also be used as other heat sources, such as phosphoric acid pipeline heating, disk dryer heat source, etc., further reducing the dependence of the lithium salt plant on external steam, achieving the purpose of controlling costs and improving production efficiency;

[0067] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0068] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A novel lithium ore clinker cooling device, characterized in that: It comprises a lower material bin with a discharge port and a buffer bin with a feed port, a feeding bin is arranged between the buffer bin and the lower material bin, and a push plate is installed in the feeding bin; Among them, the push plate extends obliquely, and one end of the push plate close to the buffer bin is higher than the end close to the lower bin, the push plate is connected to the excitation system, the push plate includes a perforated plate section and a sealing section, the orifice plate section is located below the buffer bin, the orifice plate section includes an upper orifice plate and a lower orifice plate, the aperture of the upper orifice plate is smaller than the aperture of the lower orifice plate, a heat dissipation interlayer is also arranged between the upper orifice plate and the lower orifice plate, the bottom of the lower orifice plate is connected to a perforated air duct, the air outlet of the perforated air duct faces the lower orifice plate, and a blowing component for blowing air toward the lower bin is also installed on the outer wall located at the lower side of the push plate.

2. A novel lithium ore clinker cooling device according to claim 1, characterized in that: One end of the push plate is connected to a fixed support via a connecting beam, the connecting beam passes through a hole in the outer wall, a sealing member fixed on the outer wall is provided at the hole in the outer wall, the sealing member is connected to the connecting beam, an air supply pipe connected to a perforated air duct is installed in the connecting beam, and the air supply pipe is connected to an air source.

3. A novel lithium ore clinker cooling device according to claim 2, characterized in that: The push plate includes a longitudinal frame and a transverse frame which are arranged alternately. The connecting beam is connected to one end of the longitudinal frame. The longitudinal frame is connected to the vibration excitation system via a rotating connecting piece.

4. A novel lithium ore clinker cooling device according to claim 3, characterized in that: The excitation system includes a hydraulic exciter and an excitation main column connected to the hydraulic exciter, an excitation crossbeam is installed on the excitation main column, and a plurality of excitation sub-columns connected to the longitudinal frame are arranged on the excitation crossbeam.

5. A novel lithium ore clinker cooling device according to claim 1, characterized in that: The bottom limit of the push plate is located at the top of multiple vertical pillars, and the blowing assembly includes a first air cannon located on the outer wall of one side of the push plate and a second air cannon located on the outer wall of the bottom of the push plate. The blowing directions of the first air cannon and the second air cannon are both toward the lower hopper, and the nozzle of the blowing assembly is arranged to avoid the vertical pillars. An angle steel block is provided on the back of the second air cannon nozzle, and the angle steel block is perpendicular to the second air cannon nozzle.

6. A novel lithium ore clinker cooling device according to claim 1, characterized in that: A baffle plate corresponding to the air outlet position of the perforated air duct is also installed at the bottom of the lower perforated plate. The baffle plate includes a fixed plate connected to the lower perforated plate and baffles arranged on both sides of the fixed plate. The baffle plate completely covers the air outlet of the perforated air duct.

7. A novel lithium ore clinker cooling device according to claim 1, characterized in that: It also includes a smoke bin and a steam bin, which are adjacently arranged, and the smoke bin and the buffer bin are located above the orifice plate section of the push plate, and the steam bin is located above the sealing section of the push plate on the side of the lower bin. A primary roller crushing assembly and a secondary roller crushing assembly are respectively provided in the buffer bin and the lower bin, and a movable cover plate is also provided on the bin wall between the buffer bin and the smoke bin, and the movable cover plate is hinged to the inner wall of the smoke bin.

8. A novel lithium ore clinker cooling device according to claim 7, characterized in that: A water cooling component and a filtering component are arranged in the steam bin, the water cooling component includes a horizontal beam and a water pipe arranged on the horizontal beam, a multi-stage spray head is arranged on the side of the water pipe facing the push plate, the filtering component is arranged above the water cooling component, and the filtering component includes a partition plate and filtering and cleaning equipment arranged in the partition plate.

9. A novel lithium ore clinker heat recovery system, characterized in that: The cooling device comprises the cooling device according to any one of claims 1 to 8, and further comprises a cyclone dust collecting device and a waste heat boiler connected in sequence to the cooling device, the cooling device is also connected to a low-pressure steam cleaner, and the low-pressure steam cleaner is connected to the MVR forced evaporator via a steam compressor.

10. A novel lithium ore clinker heat recovery system according to claim 9, characterized in that: One end of the cyclone dust collecting device is communicated with the smoke bin of the cooling device, the bottom of the cyclone dust collecting device is communicated with the lower bin of the cooling device, and the low-pressure steam cleaner is communicated with the steam bin of the cooling device.

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