Lithium ore roasting waste heat recovery device and process for extracting beryllium from lithium-containing ore

Abstract

The invention provides a lithium ore roasting waste heat recovery device and a process for extracting beryllium from lithium-containing ore. The waste heat recovery device comprises a box body, an adjusting mechanism and a heat exchange pipe. A first dispersion cover and a second dispersion cover are mounted on the left side and the right side of the box body through bolts, and the adjusting mechanism is located outside the second dispersion cover; the adjusting mechanism comprises a discharge pipe, a mounting cover and an adjusting motor, the discharge pipe is fixedly arranged at the outlet end of the second dispersion cover, and the mounting cover is hermetically mounted at the outer end of the discharge pipe through a bolt. The flow channel of the heat exchange element is designed to be of a reducing structure with a thick inlet and a thin outlet, at the moment, a high-temperature section at the inlet position can fully exchange heat, but the heat of smoke entering a low-temperature section is not higher than that of the high-temperature section, the inner diameter of the outlet section can be reduced, the smoke flow is small at the moment, and therefore most smoke can be gathered in the low-temperature section, and full heat exchange of the low-temperature section can be achieved.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology, and in particular to a waste heat recovery device for lithium ore roasting and a process for extracting beryllium from lithium-containing ore. Background Technology

[0002] Lithium ore roasting is a key pretreatment step in lithium ore processing. It involves heating the minerals at high temperatures to induce physicochemical changes, facilitating the subsequent extraction of valuable metals. Generally, lithium ore roasting requires further heating in a roasting furnace. During the operation of the roasting furnace, a large amount of heat-retaining flue gas is generated. In high-temperature processes such as lithium ore roasting, waste heat recovery is particularly important. This involves collecting and reusing the waste heat emitted by the system through technical means to improve energy efficiency, reduce energy consumption, and reduce emissions.

[0003] CN116086204B discloses a low-temperature waste heat recovery device for a calcining furnace, including a flue gas inlet pipe and a flue gas outlet pipe. A ceramic heat exchanger is vertically mounted between the flue gas inlet pipe and the flue gas outlet pipe. The ceramic heat exchanger has a first flue gas condensation channel, a second flue gas condensation channel, and a heat exchange liquid channel inside. Both the flue gas inlet pipe and the flue gas outlet pipe are provided with a baffle plate near the ceramic heat exchanger. The baffle plate is used to continuously block the inlet and outlet of the first or second flue gas condensation channel after the ceramic heat exchanger moves. An inner wall cleaning component is mounted on the baffle plate and is used to clean the inner walls of the first and second heat exchange liquid channels.

[0004] As can be seen from the above scheme, since the flue gas inlet and outlet have the same diameter, the heat energy in the high-temperature section and the low-temperature section will be the same during the heat exchange process. This will result in an excess of heat energy at the high-temperature end, but a lack of heat energy at the low-temperature end, which will directly affect the heat transfer coefficient and the heat exchange area utilization rate.

[0005] Therefore, it is necessary to provide a lithium ore roasting waste heat recovery device and a beryllium extraction process from lithium-containing ore to solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention provides a lithium ore roasting waste heat recovery device and a beryllium extraction process from lithium-containing ore, which solves the technical problem in related technologies where the heat energy in the high-temperature and low-temperature sections is the same, resulting in excess heat energy at the high-temperature end but a lack of heat energy at the low-temperature end.

[0007] To solve the above-mentioned technical problems, the present invention provides a lithium ore roasting waste heat recovery device, including a housing, an adjustment mechanism and heat exchange tubes; The first and second dispersion covers are bolted to the left and right sides of the box, and the adjustment mechanism is located outside the second dispersion cover. The adjustment mechanism includes a discharge pipe, a mounting cover, and an adjustment motor. The discharge pipe is fixed to the outlet end of the second dispersion cover. The mounting cover is sealed to the outer end of the discharge pipe by bolts. The adjustment motor is installed to the outer end of the mounting cover by bolts. A drive gear is connected to the keyway of the output shaft of the adjustment motor inside the mounting cover. A driven gear is meshed with one side of the drive gear. A turntable is fixed inside the driven gear. Multiple arc-shaped grooves are opened inside the turntable. A fixed plate is fixed inside the discharge pipe and at the rear of the turntable. Multiple inclined grooves are opened inside the fixed plate. A slider is slidably connected inside each of the multiple inclined grooves. An adjustment plate is fixed to the outer wall of the slider. A locking pin is fixed to the outer wall of the adjustment plate. The heat exchange tube is installed inside the box body. The heat exchange tube is sealed with an inlet pipe and an outlet pipe on both sides. The inlet end of the first dispersion hood is integrated with a roasting furnace exhaust pipe. The inner wall of the box body and the sides of the heat exchange tube are fixed with baffles.

[0008] Preferably, the plurality of arc-shaped grooves are equidistantly distributed in a ring about the axis of the turntable, and the plurality of inclined grooves are equidistantly distributed in a ring about the axis of the fixed disk.

[0009] Preferably, the driven gear and the discharge pipe are rotatably connected, the multiple arc-shaped grooves and the locking pins are slidably connected, and the outer walls of the multiple adjusting plates are tightly fitted together.

[0010] Preferably, it also includes a drive mechanism and a cleaning mechanism; The drive mechanism includes a mounting bracket and a drive motor. The mounting bracket is bolted to the top of the housing, and the drive motor is bolted to the top of the mounting bracket. The cleaning mechanism includes four first positioning seats, two second positioning seats, and a first gear. The four first positioning seats are fixed to the top of the housing, and the two second positioning seats are fixed to the top of the housing and located on opposite sides of the four first positioning seats. The first gear is keyway connected to the output shaft of the drive motor. Two slide rods are fixed inside the four first positioning seats. A lead screw is rotatably connected to opposite sides of the two second positioning seats. A horizontally moving moving plate is threaded to the outer wall of the lead screw. A second gear is fixed to the outer wall of the lead screw and located on one side of the moving plate. Three cleaning frames are fixed to the bottom of the moving plate, and multiple steel brushes are fixed to the inner walls of the three cleaning frames.

[0011] Preferably, the two sides of the movable plate are slidably connected to the two slide rods, and the first gear and the second gear mesh with each other.

[0012] Preferably, the inner width of the cleaning frame is greater than the diameter of the heat exchange tube, and the plurality of steel brushes are equidistantly arranged about the vertical direction of the cleaning frame. The top of the first gear is rotatably connected to the housing via a bearing.

[0013] Preferably, it also includes auxiliary mechanisms; The output shaft of the drive motor is connected to a ratchet via a keyway above the first gear, and a ratchet gear is meshed with the outer wall of the ratchet. The auxiliary mechanism includes a rotating shaft and a driven pulley. The rotating shaft is rotatably connected inside the housing and is located in the same horizontal direction as the ratchet. The driven pulley is connected to the top of the rotating shaft via a keyway. The bottom of the rotating shaft, located inside the housing, is connected to a fan blade via a keyway. A belt is fitted on the outer wall of the driven pulley and the ratchet.

[0014] Preferably, the ratchet gear and the housing are rotatably connected, and the bottom limit position of the fan blade is higher than the top limit position of the moving plate.

[0015] The process of extracting beryllium from lithium-containing ore includes the following steps: S1: Ore pretreatment; Raw material requirements: Li₂O ≥ 5%, BeO ≥ 0.1%, Fe₂O₃ ≤ 1.5%; Two-stage crushing: jaw crusher to 10mm → ball milling to 80-100 mesh; Flotation reagents: 200g / t sodium oleate + 500g / t water glass, enriching BeO in concentrate to 1.2%; S2: Sulfate-activated roasting; Formula: Mineral powder:Na2SO4:CaO = 100:35:8 (mass ratio); Dynamic roasting: Rotary kiln 750℃±20℃, residence time 120±5min; The high-temperature flue gas generated during roasting enters the interior of the box through the flue pipe of the roasting furnace. After the waste heat is recovered, the discharged flue gas is absorbed by water to produce 20-30% dilute sulfuric acid for reuse in the leaching process. S3: Water immersion separation; Leaching conditions: Mix the roasted mineral powder with water at a mass ratio of 1:4-6, and add 0.5-1.0% Na2CO3 as a co-solvent; Control parameters: temperature 180-200℃, pressure 1.2-1.5MPa, time 3-4h; S4: Graded sedimentation; Primary precipitation: CO2 is bubbled into the leachate until the pH reaches 7.0-7.5, precipitating BeCO3·2H2O; Secondary precipitation: Continue to pass CO2 until pH=6.0-6.5, and recover Li2CO3 byproduct; S5: Preparation of beryllium hydroxide; Neutralization precipitation: Titrate with ammonia water to pH=8.5±0.2, and let it age for 120 min.

[0016] Compared with related technologies, the lithium ore roasting waste heat recovery device and beryllium extraction process from lithium-bearing ore provided by the present invention have the following beneficial effects: The exhaust duct is designed with an adjustable inner diameter and a variable cross-section flow channel. Considering the characteristic that the flue gas temperature in the roasting furnace gradually decreases from the inlet to the outlet, the heat exchange element flow channel is designed with a variable diameter structure of "coarse inlet and fine outlet". At this time, the high-temperature section at the inlet can fully form heat exchange, but the heat of the flue gas entering the low-temperature section is not as high as that of the high-temperature section. The inner diameter of the outlet section can be reduced. At this time, the flue gas flow rate is small, so most of the flue gas will accumulate in the low-temperature section, which can achieve full heat exchange in the low-temperature section. This can effectively avoid the excess heat energy at the high-temperature end and the lack of heat energy at the low-temperature end, and maximize the utilization of the heat exchange area. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the optimal structure for the present invention; Figure 2 for Figure 1 The diagram shows a side view of the structure. Figure 3 for Figure 1 The diagram shows a cross-sectional view of the box structure. Figure 4 for Figure 1 The diagram shows a cross-sectional view of the adjustment mechanism. Figure 5 for Figure 4 The diagram shows the disassembled structure of the adjustment mechanism; Figure 6 for Figure 5 The diagram shows a side view of the structure. Figure 7 for Figure 5 The diagram shows the initial working state structure of the adjustment mechanism. Figure 8 for Figure 7 The diagram shows the rotary adjustment working state of the adjustment mechanism. Figure 9 for Figure 3 The diagram shows a detailed structural diagram of the heat exchange tube. Figure 10 This is a schematic diagram of the installation structure of the box and baffle provided by the present invention; Figure 11 for Figure 1The diagram shows the structure of the drive mechanism and auxiliary mechanism; Figure 12 for Figure 11 The enlarged structural diagram at point A is shown below; Figure 13 This is a schematic diagram of the cleaning mechanism provided by the present invention; Figure 14 This is a schematic diagram showing the distribution of the cleaning plate and heat exchange tubes provided by the present invention.

[0019] Description of Figure Numbers: 1. Box body; 2. First dispersion hood; 3. Second dispersion hood; 4. Adjustment mechanism; 41. Discharge pipe; 42. Mounting cover; 43. Adjustment motor; 44. Drive gear; 45. Driven gear; 46. Turntable; 47. Arc groove; 48. Fixed plate; 49. Inclined groove; 410. Adjustment plate; 411. Locking pin; 412. Sliding block. 5. Drive mechanism; 51. Mounting bracket; 52. Drive motor; 53. Ratchet; 54. Ratchet gear; 55. Belt; 6. Cleaning mechanism; 61. First positioning seat; 62. Second positioning seat; 63. Slide rod; 64. Lead screw; 65. First gear; 66. Second gear; 67. Moving plate; 68. Cleaning frame; 69. Steel brush; 7. Auxiliary mechanism; 71. Rotating shaft; 72. Driven pulley; 73. Fan blade; 8. Exhaust pipe of the roasting furnace; 9. Heat exchanger tubes; 10. Baffles; 11. Inlet pipe; 12. Outlet pipe. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] This invention provides a lithium ore roasting waste heat recovery device and a process for extracting beryllium from lithium-containing ore.

[0022] First embodiment: Please combine Figures 1 to 10 A lithium ore roasting waste heat recovery device includes a housing 1, an adjustment mechanism 4, and a heat exchange tube 9; The first dispersion cover 2 and the second dispersion cover 3 are bolted to the left and right sides of the box 1, and the adjustment mechanism 4 is located outside the second dispersion cover 3. The adjustment mechanism 4 includes a discharge pipe 41, a mounting cover 42, and an adjustment motor 43. The discharge pipe 41 is fixed to the outlet end of the second dispersion cover 3. The mounting cover 42 is sealed to the outer end of the discharge pipe 41 by bolts. The adjustment motor 43 is bolted to the outer end of the mounting cover 42. A drive gear 44 is connected to the keyway of the output shaft of the adjustment motor 43 inside the mounting cover 42. A driven gear 45 is meshed with one side of the drive gear 44. A turntable 46 is fixed inside the driven gear 45. Multiple arc-shaped grooves 47 are opened inside the turntable 46. A fixed disk 48 is fixed inside the discharge pipe 41 and at the rear of the turntable 46. Multiple inclined grooves 49 are opened inside the fixed disk 48. A slider 412 is slidably connected inside each of the multiple inclined grooves 49. An adjustment plate 410 is fixed to the outer wall of the slider 412. A locking pin 411 is fixed to the outer wall of the adjustment plate 410. The heat exchange tube 9 is installed inside the housing 1. The heat exchange tube 9 is sealed and fixed with an inlet pipe 11 and an outlet pipe 12 on both sides. The first dispersion cover 2 is integrated with a roasting furnace exhaust pipe 8 at its inlet end. The inner wall of the housing 1 and the sides of the heat exchange tube 9 are fixed with baffles 10.

[0023] See also Figure 4 and Figure 7 The starting adjustment motor 43 can control the forward and reverse rotation of the drive gear 44. In the initial state, the locking pin 411 is located at the outermost side of the arc groove 47, and multiple adjustment plates 410 fit together to form a hollow, at which time the inner diameter of the hollow is at its maximum.

[0024] See also Figure 4 and Figure 8 The start-up adjustment motor 43 controls the drive gear 44 to rotate counterclockwise. When the drive gear 44 rotates counterclockwise, it will drive the driven gear 45 to rotate clockwise, thereby realizing the clockwise driven rotation of the turntable 46. The turntable 46 drives the internal arc groove 47 to rotate clockwise, controlling the locking pin 411 inside the arc groove 47 to resist the force. The locking pin 411 will follow the trajectory of the arc groove 47 from the outermost side to the inner side, and during the movement, it will drive the adjustment plate 410 to move in conjunction.

[0025] See also Figure 5 and Figure 6 When the adjusting plate 410 is affected by the movement of the locking pin 411, each adjusting plate 410 will slide inside the inclined groove 49 through the slider 412. According to the rotation of the arc groove 47, each adjusting plate 410 will adaptively slide from the outside to the inside of the inclined groove 49. During the sliding process, the adjusting plates 410 are always in contact with each other, so that the hollow inner diameter formed by the adjusting plates 410 gradually decreases.

[0026] The plurality of arc-shaped grooves 47 are equidistantly distributed in a ring about the axis of the turntable 46, and the plurality of inclined grooves 49 are equidistantly distributed in a ring about the axis of the fixed disk 48.

[0027] The driven gear 45 and the discharge pipe 41 are rotatably connected, the multiple arc-shaped grooves 47 and the locking pins 411 are slidably connected, and the outer walls of the multiple adjusting plates 410 are tightly fitted together.

[0028] The working principle of this embodiment: S1: First, the roasting furnace exhaust pipe 8 needs to be connected and circulated with the first dispersion hood 2. The inner diameter of the roasting furnace exhaust pipe 8 remains unchanged and is the maximum diameter pipe. When the lithium ore is roasted, high temperature flue gas will be formed at the top. This flue gas will enter the box 1 through the first dispersion hood 2 via the roasting furnace exhaust pipe 8. S2: The user injects cold water into the heat exchange tube 9 through the water inlet pipe 11. When the high-temperature flue gas in the chamber 1 comes into contact with the heat exchange tube 9, heat exchange will occur. Water can be added to the heat exchange tube 9. After the water inside the heat exchange tube 9 is heated, it can be discharged through the water outlet pipe 12. S3: Since inclined baffles 10 are fixed on both sides of the interior of the box 1, when the flue gas flows from the initial high temperature section to the rear low temperature section, some flue gas will be blocked by the baffles 10, change the flow direction and gather towards the low temperature section. S4: When the flue gas flows from the low temperature section to the second dispersion hood 3, smoke exhaust is required. During smoke exhaust, the user can start the regulating motor 43 to control the drive gear 44 to rotate counterclockwise. When the drive gear 44 rotates counterclockwise, it will drive the meshing control of the driven gear 45 to rotate clockwise, thereby changing the inner diameter formed between the regulating plates 410, and then smoke exhaust can be carried out. This embodiment

[0029] Compared to the traditional design where the inlet and outlet flue gas channels have the same inner diameter, this design features an adjustable inner diameter for the outlet flue gas channel and a variable cross-section flow channel. Addressing the characteristic that the flue gas temperature gradually decreases from the inlet to the outlet of the roasting furnace, the heat exchange element flow channel is designed with a variable diameter structure of "coarse inlet and fine outlet." This allows for sufficient heat exchange in the high-temperature section at the inlet, but the heat of the flue gas entering the low-temperature section is not as high as in the high-temperature section. Therefore, the inner diameter of the outlet section can be reduced, resulting in a smaller flue gas flow rate. Consequently, most of the flue gas will accumulate in the low-temperature section, achieving sufficient heat exchange in the low-temperature section. This effectively avoids excess heat at the high-temperature end and insufficient heat at the low-temperature end, maximizing the utilization of the heat exchange area. Secondly, the inclined baffle 10 can change the path of the flue gas, reduce resistance, and guide the flue gas to evenly flush the heat exchange surface, avoiding insufficient local heat exchange caused by flue gas "wall-adhering flow" or "short-circuit flow", and ensuring sufficient heat exchange inside the box 1.

[0030] Second embodiment: See also Figure 3 , Figures 11 to 14 It also includes a drive mechanism 5 and a clearing mechanism 6; The drive mechanism 5 includes a mounting frame 51 and a drive motor 52. The mounting frame 51 is bolted to the top of the housing 1, and the drive motor 52 is bolted to the top of the mounting frame 51. The cleaning mechanism 6 includes four first positioning seats 61, two second positioning seats 62, and a first gear 65. The four first positioning seats 61 are fixed to the top of the housing 1, and the two second positioning seats 62 are fixed to the top of the housing 1 and located on opposite sides of the four first positioning seats 61. The first gear 65 is keyway connected to the output shaft of the drive motor 52. Two slide rods 63 are fixed inside the four first positioning seats 61. A lead screw 64 is rotatably connected to opposite sides of the two second positioning seats 62. A horizontally moving moving plate 67 is threadedly connected to the outer wall of the lead screw 64. A second gear 66 is fixed to the outer wall of the lead screw 64 and located on one side of the moving plate 67. Three cleaning frames 68 are fixed to the bottom of the moving plate 67. Multiple steel brushes 69 are fixed to the inner walls of the three cleaning frames 68.

[0031] See also Figure 12 and Figure 13 The start of the drive motor 52 can control the first gear 65 to rotate counterclockwise. The counterclockwise rotation of the first gear 65 meshes and controls the second gear 66 to rotate in conjunction. When the second gear 66 rotates, it can control the lead screw 64 to rotate inside the second positioning seat 62, thereby realizing the rotation of the lead screw 64 to drive the moving plate 67 and the cleaning frame 68 to move along the horizontal direction of the lead screw 64.

[0032] The two sides of the movable plate 67 are slidably connected to the two slide rods 63, and the first gear 65 and the second gear 66 mesh with each other.

[0033] The inner width of the cleaning frame 68 is greater than the diameter of the heat exchange tube 9. The multiple steel brushes 69 are equidistantly arranged about the vertical direction of the cleaning frame 68. The top of the first gear 65 is rotatably connected to the housing 1 through a bearing.

[0034] See also Figure 14 When the cleaning rack 68 moves, it will move outside the heat exchange tube 9, and the heat exchange tube 9 is placed in the inner layer of the cleaning rack 68. Therefore, when the cleaning rack 68 passes through the heat exchange tube 9, the steel brush 69 inside the cleaning rack 68 can clean and scrape the outer wall of the heat exchange tube 9. This embodiment

[0035] The waste heat recovery efficiency can be improved by setting up a cleaning mechanism 6. If ash accumulates on the heating surface, it will form thermal resistance and hinder the heat transfer between the flue gas and the working fluid. After cleaning, the heat exchange capacity of the heating surface is restored, and the heat of the high-temperature flue gas discharged from the roasting furnace can be recovered more fully, thereby improving the waste heat utilization rate, reducing fuel consumption or increasing energy output. Removing ash can reduce the chemical corrosion and physical wear of equipment, lower the probability of equipment failure, extend the service life of components, and reduce maintenance and replacement costs. By restoring heat exchange performance, reducing energy consumption, reducing equipment wear, and ensuring stable production, it can ultimately achieve multiple benefits such as energy saving, cost reduction, efficiency improvement, and environmental protection, which is crucial for the sustainable production of high-energy-consuming industries such as ore roasting.

[0036] Third embodiment: See also Figure 3 , Figures 11 to 12 It also includes auxiliary mechanisms 7; The output shaft of the drive motor 52 and the keyway above the first gear 65 are connected to a ratchet 53, and the outer wall of the ratchet 53 is meshed with a ratchet gear 54. The auxiliary mechanism 7 includes a rotating shaft 71 and a driven pulley 72. The rotating shaft 71 is rotatably connected to the inside of the housing 1 and is located in the same horizontal direction as the ratchet 54. The driven pulley 72 is keyway connected to the top of the rotating shaft 71. The bottom of the rotating shaft 71 and the keyway inside the housing 1 are connected to a fan blade 73. A belt 55 is sleeved on the outer wall of the driven pulley 72 and the ratchet 54.

[0037] See also Figure 12 In the second embodiment, the drive motor 52 rotates counterclockwise, so the ratchet 53 will also rotate counterclockwise. The counterclockwise rotation of the ratchet 53 will not affect the rotation of the ratchet gear 54. When the cleaning rack 68 switches from the working state to the initial state, the user needs to start the drive motor 52 to rotate clockwise to control the cleaning rack 68 to switch to the initial state.

[0038] See also Figure 11 and Figure 12 When the ratchet 53 rotates clockwise, the clockwise rotating ratchet 53 will engage and drive the ratchet gear 54 to rotate. When the ratchet gear 54 rotates, it will affect the driven pulley 72 of the transmission belt 55, which will drive the rotating shaft 71 to control the fan blade 73 to rotate inside the housing 1. When the fan blade 73 rotates, it will generate a blowing force inside the housing 1.

[0039] The ratchet 54 and the housing 1 are rotatably connected, and the bottom limit position of the fan blade 73 is higher than the top limit position of the moving plate 67. This embodiment

[0040] When the cleaning rack 68 switches from the working state to the initial state, the user needs to start the drive motor 52 to rotate clockwise. The clockwise rotation of the drive motor 52 will control the fan blade 73 to rotate inside the housing 1 and generate a blowing force inside the housing 1. This blowing force will diffuse the impurities on the surface of the heat exchange tube 9 after cleaning inside the housing 1, which can prevent the impurities after cleaning from accumulating at the bottom of the housing 1 and is conducive to cleaning the impurities on the surface of the heat exchange tube 9 after stripping. It can maintain unobstructed flue gas passages, ensure the stable operation of the roasting furnace and waste heat recovery system, avoid production interruptions due to equipment failure, and prevent ash from undergoing secondary reactions at high temperatures to generate harmful substances, or from excessive combustion due to reduced equipment efficiency, thus further reducing environmental pressure.

[0041] Fourth embodiment: The process of extracting beryllium from lithium-containing ore includes the following steps: S1: Ore pretreatment; Raw material requirements: Li₂O ≥ 5%, BeO ≥ 0.1%, Fe₂O₃ ≤ 1.5%; Two-stage crushing: jaw crusher to 10mm → ball milling to 80-100 mesh; Flotation reagents: 200g / t sodium oleate + 500g / t water glass, enriching BeO in concentrate to 1.2%; S2: Sulfate-activated roasting; Formula: Mineral powder:Na2SO4:CaO = 100:35:8 (mass ratio); Dynamic roasting: Rotary kiln 750℃±20℃, residence time 120±5min; The high-temperature flue gas generated during roasting enters the interior of the box through the flue pipe of the roasting furnace. After the waste heat is recovered, the discharged flue gas is absorbed by water to produce 20-30% dilute sulfuric acid for reuse in the leaching process. S3: Water immersion separation; Leaching conditions: Mix the roasted mineral powder with water at a mass ratio of 1:4-6, and add 0.5-1.0% Na2CO3 as a co-solvent; Control parameters: temperature 180-200℃, pressure 1.2-1.5MPa, time 3-4h; S4: Graded sedimentation; Primary precipitation: CO2 is bubbled into the leachate until the pH reaches 7.0-7.5, precipitating BeCO3·2H2O; Secondary precipitation: Continue to pass CO2 until pH=6.0-6.5, and recover Li2CO3 byproduct; S5: Preparation of beryllium hydroxide; Neutralization precipitation: Titrate with ammonia water to pH=8.5±0.2, and let it age for 120 min.

[0042] Currently, beryllium resource extraction mainly faces the following technical bottlenecks: 1. Limited raw materials: Traditional processes rely on independent beryllium ores such as beryl (BeO≥4%), while the recovery rate of low-grade beryllium (BeO0.1%-0.5%) associated with lithium ores is less than 60%; 2. Severe pollution: The current acid leaching method generates a large amount of acidic wastewater (pH<1), and the treatment cost accounts for more than 25% of the operating expenses; 3. Difficulty in separation: Lithium and beryllium have similar chemical properties, and the separation coefficient α is less than 5 in conventional processes; 4. Equipment corrosion: Strong acid media cause annual corrosion of 316L stainless steel to exceed 2mm. This embodiment

[0043] Beryllium is converted into water-soluble BeSO4 through sodium sulfate activation roasting, and green extraction is achieved by pressurized water leaching. An innovative CO2 fractional precipitation method is used to separate lithium and beryllium.

[0044] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A lithium ore roasting waste heat recovery device, characterized in that, Includes the housing, regulating mechanism, and heat exchange tubes; The first and second dispersion covers are bolted to the left and right sides of the box, and the adjustment mechanism is located outside the second dispersion cover. The adjustment mechanism includes a discharge pipe, a mounting cover, and an adjustment motor. The discharge pipe is fixed to the outlet end of the second dispersion cover. The mounting cover is sealed to the outer end of the discharge pipe by bolts. The adjustment motor is installed to the outer end of the mounting cover by bolts. A drive gear is connected to the keyway of the output shaft of the adjustment motor inside the mounting cover. A driven gear is meshed with one side of the drive gear. A turntable is fixed inside the driven gear. Multiple arc-shaped grooves are opened inside the turntable. A fixed plate is fixed inside the discharge pipe and at the rear of the turntable. Multiple inclined grooves are opened inside the fixed plate. A slider is slidably connected inside each of the multiple inclined grooves. An adjustment plate is fixed to the outer wall of the slider. A locking pin is fixed to the outer wall of the adjustment plate. The heat exchange tube is installed inside the box body. The heat exchange tube is sealed with an inlet pipe and an outlet pipe on both sides. The inlet end of the first dispersion hood is integrated with a roasting furnace exhaust pipe. The inner wall of the box body and the sides of the heat exchange tube are fixed with baffles.

2. The lithium ore roasting waste heat recovery device according to claim 1, characterized in that, The multiple arc-shaped grooves are equidistantly distributed in a ring about the axis of the turntable, and the multiple inclined grooves are equidistantly distributed in a ring about the axis of the fixed plate.

3. The lithium ore roasting waste heat recovery device according to claim 1, characterized in that, The driven gear and the discharge pipe are rotatably connected, the multiple arc-shaped grooves and the locking pins are slidably connected, and the outer walls of the multiple adjusting plates are tightly fitted together.

4. The lithium ore roasting waste heat recovery device according to claim 1, characterized in that, It also includes a drive mechanism and a clearing mechanism; The drive mechanism includes a mounting bracket and a drive motor. The mounting bracket is bolted to the top of the housing, and the drive motor is bolted to the top of the mounting bracket. The cleaning mechanism includes four first positioning seats, two second positioning seats, and a first gear. The four first positioning seats are fixed to the top of the housing, and the two second positioning seats are fixed to the top of the housing and located on opposite sides of the four first positioning seats. The first gear is keyway connected to the output shaft of the drive motor. Two slide rods are fixed inside the four first positioning seats. A lead screw is rotatably connected to opposite sides of the two second positioning seats. A horizontally moving moving plate is threaded to the outer wall of the lead screw. A second gear is fixed to the outer wall of the lead screw and located on one side of the moving plate. Three cleaning frames are fixed to the bottom of the moving plate, and multiple steel brushes are fixed to the inner walls of the three cleaning frames.

5. A lithium ore roasting waste heat recovery device according to claim 4, characterized in that, The two sides of the movable plate are slidably connected to the two slide rods, and the first gear and the second gear mesh with each other.

6. The lithium ore roasting waste heat recovery device according to claim 4, characterized in that, The inner width of the cleaning frame is greater than the diameter of the heat exchange tube. Multiple steel brushes are equidistantly arranged about the vertical direction of the cleaning frame. The top of the first gear is rotatably connected to the housing via a bearing.

7. A lithium ore roasting waste heat recovery device according to claim 4, characterized in that, It also includes auxiliary mechanisms; The output shaft of the drive motor is connected to a ratchet via a keyway above the first gear, and a ratchet gear is meshed with the outer wall of the ratchet. The auxiliary mechanism includes a rotating shaft and a driven pulley. The rotating shaft is rotatably connected inside the housing and is located in the same horizontal direction as the ratchet. The driven pulley is connected to the top of the rotating shaft via a keyway. The bottom of the rotating shaft, located inside the housing, is connected to a fan blade via a keyway. A belt is fitted on the outer wall of the driven pulley and the ratchet.

8. A lithium ore roasting waste heat recovery device according to claim 7, characterized in that, The ratchet and the housing are rotatably connected, and the bottom limit position of the fan blade is higher than the top limit position of the moving plate.

9. A process for extracting beryllium from lithium-bearing ore, characterized in that, The process for extracting beryllium from lithium-bearing ore includes a lithium ore roasting waste heat recovery device as described in any one of claims 1-8, comprising the following steps: S1: Ore pretreatment; Raw material requirements: Li₂O ≥ 5%, BeO ≥ 0.1%, Fe₂O₃ ≤ 1.5%; Two-stage crushing: jaw crusher to 10mm → ball milling to 80-100 mesh; Flotation reagents: 200g / t sodium oleate + 500g / t water glass, enriching BeO in concentrate to 1.2%; S2: Sulfate-activated roasting; Formula: Mineral powder:Na2SO4:CaO = 100:35:8 (mass ratio); Dynamic roasting: Rotary kiln 750℃±20℃, residence time 120±5min; The high-temperature flue gas generated during roasting enters the interior of the box through the flue gas pipe of the roasting furnace. After the waste heat is recovered, the discharged flue gas is absorbed by water to produce 20-30% dilute sulfuric acid for reuse in the leaching process. S3: Water immersion separation; Leaching conditions: Mix the roasted mineral powder with water at a mass ratio of 1:4-6, and add 0.5-1.0% Na2CO3 as a co-solvent; Control parameters: temperature 180-200℃, pressure 1.2-1.5MPa, time 3-4h; S4: Graded sedimentation; Primary precipitation: CO2 is bubbled into the leachate until the pH reaches 7.0-7.5, precipitating BeCO3·2H2O; Secondary precipitation: Continue to pass CO2 until pH=6.0-6.5, and recover Li2CO3 byproduct; S5: Preparation of beryllium hydroxide; Neutralization precipitation: Titrate with ammonia water to pH=8.5±0.2, and let it age for 120 min.

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