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

Abstract

The application provides a lithium ore roasting waste heat recovery device and a process for extracting beryllium from lithium-containing ore. It relates to the technical field of waste heat recovery, comprising a box, an adjusting mechanism and a heat exchange pipe; first and second dispersion covers are installed on the left and right sides of the box 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 sealingly installed at the outer end of the discharge pipe through bolts; the smoke discharge channel is designed to be linked and adjusted in diameter, a variable cross-section flow channel is designed, and the heat exchange element flow channel is designed as a variable-diameter structure with a wide inlet and a narrow outlet; at this time, the high-temperature section at the inlet position 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, so the inner diameter of the outlet section can be reduced; at this time, the flue gas flow is small, so most of the flue gas will gather in the low-temperature section, and sufficient heat exchange in the low-temperature section can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste heat recovery, in particular to a lithium ore roasting waste heat recovery device and a process for extracting beryllium from lithium-containing ores. BACKGROUND

[0002] Lithium ore roasting is a key pretreatment step in lithium ore processing. Through high-temperature heating, the mineral undergoes physical and chemical changes, making it easier to extract valuable metals in the subsequent process. Generally, lithium ore roasting requires heating treatment in a roasting furnace. During the operation of the roasting furnace, a large amount of stored heat flue gas is generated. In high-temperature processes such as lithium ore roasting, waste heat recovery is particularly important. The energy-saving technology collects and reuses the waste heat discharged by the system through technical means to improve energy efficiency, reduce energy consumption, and reduce emissions.

[0003] CN116086204B proposes a roasting furnace low-temperature waste heat recovery device, which includes a flue gas inlet pipe and a flue gas outlet pipe. A ceramic heat exchange element is arranged between the flue gas inlet pipe and the flue gas outlet pipe. The ceramic heat exchange element has a first flue gas condensation channel, a second flue gas condensation channel, and a heat exchange liquid channel. The ends of the flue gas inlet pipe and the flue gas outlet pipe near the ceramic heat exchange element are provided with a matching baffle. The matching baffle is used to continuously block the inlet and outlet of the first flue gas condensation channel or the second flue gas condensation channel after the ceramic heat exchange element moves. An inner wall cleaning assembly is arranged on the matching baffle to clean the inner walls of the first heat exchange liquid channel and the second heat exchange liquid channel.

[0004] From the above scheme, it can be seen that since the diameter of the flue gas inlet and the outlet is consistent, during the heat exchange process, the high-temperature section and the low-temperature section will have consistent heat energy, resulting in excess heat energy at the high-temperature end, but lack of heat energy at the low-temperature end, which will directly affect the heat transfer coefficient and the utilization rate of the heat exchange area.

[0005] Therefore, it is necessary to provide a lithium ore roasting waste heat recovery device and a process for extracting beryllium from lithium-containing ores to solve the above technical problems. SUMMARY

[0006] The present application provides a lithium ore roasting waste heat recovery device and a process for extracting beryllium from lithium-containing ores, which solves the technical problem of consistent heat energy in the high-temperature section and the low-temperature section in the related art, resulting in excess heat energy at the high-temperature end, but lack of heat energy at the low-temperature end.

[0007] To solve the above technical problems, the present application provides a lithium ore roasting waste heat recovery device, which comprises a box body, an adjusting mechanism and a heat exchange pipe.

[0008] First and second dispersion covers are installed on the left and right sides of the box body through bolts, and the adjusting mechanism is located outside the second dispersion cover.

[0009] The adjusting mechanism comprises an exhaust pipe, a mounting cover and an adjusting motor, the exhaust pipe is fixedly arranged at the outlet end of the second dispersing cover, the mounting cover is sealingly mounted on the outer end of the exhaust pipe by bolts, the adjusting motor is mounted on the outer end of the mounting cover by bolts, a driving gear is connected to the key groove of the output shaft of the adjusting motor inside the mounting cover, a driven gear is meshingly connected to one side of the driving gear, a rotating disc is fixedly arranged inside the driven gear, a plurality of arc-shaped grooves are formed in the rotating disc, a fixed disc is fixedly arranged inside the exhaust pipe and at the rear of the rotating disc, a plurality of inclined grooves are formed in the fixed disc, a sliding block is slidingly connected to each of the inclined grooves, an adjusting plate is fixedly arranged on the outer wall of the sliding block, and a clamping pin is fixedly arranged on the outer wall of the adjusting plate.

[0010] The heat exchange pipe is mounted inside the box body, water inlet pipes and water outlet pipes are sealingly and fixedly arranged at the two sides of the heat exchange pipe, a baking furnace flue is integrally arranged at the inlet end of the first dispersing cover, and baffles are fixedly arranged on the inner wall of the box body and at the two sides of the heat exchange pipe.

[0011] Preferably, the plurality of arc-shaped grooves are equidistantly and annularly distributed about the axis of the rotating disc, and the plurality of inclined grooves are equidistantly and annularly distributed about the axis of the fixed disc.

[0012] Preferably, the driven gear and the exhaust pipe are rotationally connected, the plurality of arc-shaped grooves and the clamping pin are slidingly connected, and the outer walls of the plurality of adjusting plates are closely attached to each other.

[0013] Preferably, the adjusting mechanism further comprises a driving mechanism and a cleaning mechanism.

[0014] The driving mechanism comprises a mounting frame and a driving motor, the mounting frame is mounted on the top of the box body by bolts, and the driving motor is mounted on the top of the mounting frame by bolts.

[0015] The cleaning mechanism comprises four first positioning seats, two second positioning seats and a first gear, the four first positioning seats are fixedly arranged on the inner top of the box body, the two second positioning seats are fixedly arranged on the inner top of the box body and at the opposite side of the four first positioning seats, the first gear is connected to the key groove of the output shaft of the driving motor, two sliding rods are fixedly arranged inside the four first positioning seats, a lead screw is rotationally connected to the opposite side of the two second positioning seats, a horizontally moving moving plate is threadedly connected to the outer wall of the lead screw, a second gear is fixedly arranged on the outer wall of the lead screw and at one side of the moving plate, and three cleaning frames are fixedly arranged on the bottom of the moving plate.

[0016] Preferably, the two sides of the moving plate are slidingly connected to the two sliding rods, and the first gear and the second gear are meshingly connected to each other.

[0017] 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 in the vertical direction of the cleaning frame, and the first gear top is rotatably connected to the box through a bearing.

[0018] Preferably, the auxiliary mechanism is further included.

[0019] The driving motor output shaft is connected with a ratchet wheel through a key groove above the first gear, and the outer wall of the ratchet wheel is connected with a ratchet gear.

[0020] The auxiliary mechanism includes a rotating shaft and a driven pulley, the rotating shaft is rotatably connected to the inside of the box and located in the same horizontal direction of the ratchet gear, the driven pulley is connected to the top end of the rotating shaft through a key groove, the bottom end of the rotating shaft and located inside the box is connected with a fan blade through a key groove, and the outer wall of the driven pulley and the ratchet gear is sleeved with a belt.

[0021] Preferably, the ratchet gear and the box are rotatably connected, and the bottom limit position of the fan blade is higher than the top limit position of the moving plate.

[0022] The process for extracting beryllium from lithium-containing ore includes the following steps:

[0023] S1: ore pretreatment;

[0024] Raw material requirements: Li2O≥5%, BeO≥0.1%, Fe2O3≤1.5%;

[0025] Two-stage crushing: jaw crushing to 10mm→ball milling to 80-100 mesh;

[0026] Flotation reagent: sodium oleate 200g / t + water glass 500g / t, concentrate BeO enrichment to 1.2%;

[0027] S2: sulfate activation roasting;

[0028] Formula: ore powder: Na2SO4: CaO = 100: 35: 8 mass ratio;

[0029] Dynamic roasting: rotary kiln 750℃±20℃, residence time 120±5min;

[0030] The high-temperature flue gas generated during roasting enters the inside of the box after waste heat recovery from the roasting furnace exhaust pipe, and the exhaust gas is absorbed by water to produce 20-30% dilute sulfuric acid for the leaching process;

[0031] S3: water leaching separation;

[0032] Leaching conditions: mix the roasted ore powder with water according to a mass ratio of 1:4-6, and add 0.5-1.0% Na2CO3 as a solubility aid;

[0033] Control parameters: temperature 180-200℃, pressure 1.2-1.5MPa, time 3-4h;

[0034] S4: Graded sedimentation;

[0035] Primary precipitation: CO2 is bubbled into the leachate until the pH reaches 7.0-7.5, precipitating BeCO3·2H2O;

[0036] Secondary precipitation: Continue to pass CO2 until pH=6.0-6.5, and recover Li2CO3 byproduct;

[0037] S5: Preparation of beryllium hydroxide;

[0038] Neutralization precipitation: Titrate with ammonia water to pH=8.5±0.2, and let it age for 120 min.

[0039] 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:

[0040] 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

[0041] 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.

[0042] Figure 1 This is a schematic diagram of the optimal structure for the present invention;

[0043] Figure 2 for Figure 1 The diagram shows a side view of the structure.

[0044] Figure 3 for Figure 1 The diagram shows a cross-sectional view of the box structure.

[0045] Figure 4 for Figure 1 The diagram shows a cross-sectional view of the adjustment mechanism.

[0046] Figure 5 As shown in the adjustment mechanism split structure schematic view; Figure 4

[0047] Figure 6 As shown in the adjustment mechanism split structure schematic view; Figure 5

[0048] Figure 7 As shown in the adjustment mechanism split structure schematic view; Figure 5

[0049] Figure 8 As shown in the adjustment mechanism split structure schematic view; Figure 7

[0050] Figure 9 As shown in the adjustment mechanism split structure schematic view; Figure 3

[0051] Figure 10 As shown in the adjustment mechanism split structure schematic view;

[0052] Figure 11 As shown in the adjustment mechanism split structure schematic view; Figure 1

[0053] Figure 12 As shown in the adjustment mechanism split structure schematic view; Figure 11

[0054] Figure 13 As shown in the adjustment mechanism split structure schematic view;

[0055] Figure 14 As shown in the adjustment mechanism split structure schematic view.

[0056] BRIEF DESCRIPTION OF THE DRAWINGS

[0057] 1, box, 2, the first dispersion cover, 3, the second dispersion cover;

[0058] 4, adjustment mechanism, 41, discharge pipe, 42, mounting cover, 43, adjustment motor, 44, drive gear, 45, driven gear, 46, turntable, 47, arc slot, 48, fixed disc, 49, inclined slot, 410, adjustment plate, 411, bayonet, 412, sliding block;

[0059] 5, drive mechanism, 51, mounting frame, 52, drive motor, 53, ratchet, 54, ratchet gear, 55, belt;

[0060] ​​​​​​​6, clearing 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;

[0061] 7, auxiliary mechanism, 71, rotating shaft, 72, driven pulley, 73, fan blade;

[0062] 8, flue gas pipe of roasting furnace;

[0063] 9, heat exchange pipe, 10, baffle;

[0064] 11, water inlet pipe, 12, water outlet pipe. DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0066] The present application provides a lithium ore roasting waste heat recovery device and a process for extracting beryllium from lithium-containing ore.

[0067] First embodiment:

[0068] Please combine Figures 1 to 10 A lithium ore roasting waste heat recovery device, comprising a box body 1, an adjusting mechanism 4 and a heat exchange pipe 9;

[0069] The left and right sides of the box body 1 are provided with a first dispersion cover 2 and a second dispersion cover 3 through bolts, and the adjusting mechanism 4 is located outside the second dispersion cover 3;

[0070] The adjusting mechanism 4 comprises a discharge pipe 41, a mounting cover 42 and an adjusting motor 43, the discharge pipe 41 is fixedly arranged at the outlet end of the second dispersion cover 3, the mounting cover 42 is sealingly mounted on the outer end of the discharge pipe 41 through bolts, the adjusting motor 43 is mounted on the outer end of the mounting cover 42 through bolts, a drive gear 44 is connected to the output shaft key groove of the adjusting motor 43 inside the mounting cover 42, a driven gear 45 is meshingly connected to one side of the drive gear 44, a rotating disc 46 is fixedly arranged inside the driven gear 45, a plurality of arc-shaped grooves 47 are formed in the inside of the rotating disc 46, a fixed disc 48 is fixedly arranged inside the rotating disc 46 at the rear portion, a plurality of inclined grooves 49 are formed in the inside of the fixed disc 48, a plurality of sliding blocks 412 are slidingly connected in the inside of the inclined grooves 49, an adjusting plate 410 is fixedly arranged on the outer wall of the sliding block 412, and a clamping pin 411 is fixedly arranged on the outer wall of the adjusting plate 410;

[0071] The heat exchange pipe 9 is installed in the inside of the box body 1, the water inlet pipe 11 and the water outlet pipe 12 are fixedly arranged on both sides of the heat exchange pipe 9, the entering end of the first dispersion cover 2 is integrally provided with the baking furnace flue 8, and the inner wall of the box body 1 and located on both sides of the heat exchange pipe 9 is fixedly provided with the baffle 10.

[0072] Please refer to Figure 4 and Figure 7 : the starting adjustment motor 43 can control the positive and negative rotation of the driving gear 44, when the initial state, the pin 411 is located at the outermost side of the arc-shaped groove 47, and the plurality of adjustment plates 410 are attached to each other to form a hollow, at this time, the inner diameter of the hollow is maximum.

[0073] Please refer to Figure 4 and Figure 8 : the starting adjustment motor 43 controls the counterclockwise rotation of the driving gear 44, when the driving gear 44 rotates counterclockwise, the transmission meshing control driven gear 45 rotates clockwise, so as to realize the clockwise driven rotation of the rotating disc 46, the rotating disc 46 drives the clockwise rotation of the arc-shaped groove 47 inside, controls the contact of the pin 411 in the arc-shaped groove 47, and the pin 411 is forced to move from the outermost side to the inside along the track of the arc-shaped groove 47, and in the process of moving, the adjustment plate 410 is driven to move.

[0074] Please refer to Figure 5 and Figure 6 : when the adjustment plate 410 is affected by the movement of the pin 411, at this time, each adjustment plate 410 will slide in the inclined groove 49 through the slider 412, according to the rotation of the arc-shaped groove 47, each adjustment plate 410 will be adapted to slide from the outside to the inside of the inclined groove 49, and in the process of sliding, the adjustment plates 410 are always in the attached state, so as to realize that the inner diameter of the hollow formed by the adjustment plates 410 gradually becomes smaller.

[0075] A plurality of the arc-shaped grooves 47 are equally distributed in a ring shape about the axis of the rotating disc 46, and a plurality of the inclined grooves 49 are equally distributed in a ring shape about the axis of the fixed disc 48.

[0076] The driven gear 45 and the discharge pipe 41 are rotationally connected, the plurality of arc-shaped grooves 47 and the pin 411 are slidingly connected, and the outer walls of the plurality of adjustment plates 410 are closely attached to each other.

[0077] The working principle of the embodiment is as follows:

[0078] S1: first, the baking furnace flue 8 needs to be connected with the first dispersion cover 2 and be conducted, the inner diameter of the baking furnace flue 8 is unchanged, it is a maximum aperture pipeline, when the lithium ore is baked, high-temperature flue gas is formed at the top, the flue gas passes through the baking furnace flue 8, passes through the first dispersion cover 2 and enters the inside of the box body 1;

[0079] S2: the user injects cold water into the heat exchange pipe 9 through the water inlet pipe 11, when the high-temperature flue gas in the box 1 contacts the heat exchange pipe 9, heat replacement is formed, which can add water to the heat exchange pipe 9, and the water in the heat exchange pipe 9 can be heated and discharged through the water outlet pipe 12;

[0080] S3: Because the box 1 is internally provided with inclined baffles 10 on both sides, when the flow direction of the flue gas flows from the initial high-temperature section to the rear low-temperature section, part of the flue gas will be blocked by the baffles 10, the flow direction is changed, and the flue gas is gathered to the low-temperature section;

[0081] S4: When the flue gas flows from the low-temperature section to the second dispersion cover 3, smoke exhaust work needs to be performed, and the user can start the adjusting motor 43 to control the driving gear 44 to rotate counterclockwise when discharging smoke, and when the driving gear 44 rotates counterclockwise, the transmission meshing control driven gear 45 rotates clockwise, thereby changing the inner diameter formed between the adjusting plates 410, and the subsequent smoke exhaust can be performed.

[0082] The embodiment

[0083] Compared with the traditional design of the same inner diameter of the smoke inlet channel and the smoke exhaust channel, the smoke exhaust channel is designed to be linked to adjust the inner diameter, a variable cross-section flow channel is designed, the heat exchange element flow channel is designed to be a variable diameter structure of "wide inlet and narrow outlet" according to the characteristics that the temperature of the flue gas of the roasting furnace gradually decreases from the inlet to the outlet, at this time, the high-temperature section at the inlet position 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, and the inner diameter of the outlet section can be reduced, at this time, the flue gas flow is small, and therefore most of the flue gas is gathered in the low-temperature section, full heat exchange of the low-temperature section can be realized, heat energy surplus at the high-temperature end and lack of heat energy at the low-temperature end can be effectively avoided, and the heat exchange area is maximized.

[0084] Secondly, the inclined baffles 10 can change the path of the flue gas, reduce the resistance, guide the flue gas to uniformly wash the heat exchange surface, avoid local heat exchange deficiency caused by "wall adhesion flow" and "short circuit flow" of the flue gas, and ensure full heat exchange in the box 1.

[0085] Second embodiment:

[0086] Please refer to Figure 3 、 Figures 11 to 14 , further comprising a driving mechanism 5 and a cleaning mechanism 6;

[0087] The driving mechanism 5 comprises a mounting frame 51 and a driving motor 52, the mounting frame 51 is bolted to the top of the box 1, and the driving motor 52 is bolted to the top of the mounting frame 51;

[0088] 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 fixedly arranged on the top of the box 1, the two second positioning seats 62 are fixedly arranged on the top of the box 1 and located on the opposite side of the four first positioning seats 61, the first gear 65 is connected to the output shaft of the driving motor 52 through a key groove, two sliding rods 63 are fixedly arranged in the four first positioning seats 61, a lead screw 64 is rotatably connected to the opposite side 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 fixedly arranged on the outer wall of the lead screw 64 and located on one side of the moving plate 67, three cleaning racks 68 are fixedly arranged on the bottom of the moving plate 67, and a plurality of steel brushes 69 are fixedly arranged on the inner wall of the three cleaning racks 68.

[0089] Please refer to Figure 12 and Figure 13 : the driving motor 52 is started to control the first gear 65 to rotate counterclockwise, the counterclockwise rotating first gear 65 engages to drive and control the second gear 66 to rotate, when the second gear 66 rotates, it can drive and control the lead screw 64 to rotate in the second positioning seat 62, so that the rotating lead screw 64 drives the moving plate 67 and the cleaning rack 68 to move along the horizontal direction of the lead screw 64.

[0090] The two sides of the moving plate 67 are slidably connected with the two sliding rods 63, and the first gear 65 and the second gear 66 are engaged with each other.

[0091] The inner width of the cleaning rack 68 is greater than the pipe diameter of the heat exchange pipe 9, a plurality of steel brushes 69 are equidistantly arranged around the vertical direction of the cleaning rack 68, and the top end of the first gear 65 is rotatably connected with the box 1 through a bearing.

[0092] Please refer to Figure 14 : when the cleaning rack 68 moves, the cleaning rack 68 moves outside the heat exchange pipe 9, and the heat exchange pipe 9 is arranged in the interlayer of the cleaning rack 68, so that when the cleaning rack 68 passes through the heat exchange pipe 9, the steel brushes 69 in the cleaning rack 68 can clean and scrape the outer wall of the heat exchange pipe 9.

[0093] The embodiment

[0094] By providing the cleaning mechanism 6, the waste heat recovery efficiency can be improved, if the heating surface is covered with dust, a thermal resistance is formed, which hinders the heat transfer between the flue gas and the working medium, after cleaning, the heat exchange capacity of the heating surface is restored, the high temperature flue gas heat discharged from the roasting furnace can be more fully recovered, the waste heat utilization rate is improved, thereby reducing fuel consumption or increasing energy output;

[0095] The cleaning can reduce the chemical corrosion and physical wear of the equipment by the ash layer, reduce the probability of equipment failure, prolong the service life of the components, reduce the maintenance and replacement cost, realize the multiple benefits of energy saving, cost reduction, efficiency increase and environmental protection by restoring the heat exchange performance, reducing the energy consumption, reducing the equipment loss and ensuring the stable production, and is crucial for the sustainable production of the high energy consumption industry such as ore roasting.

[0096] Third embodiment:

[0097] Please refer to Figure 3 , Figures 11 to 12 , the auxiliary mechanism 7 is further included;

[0098] The output shaft of the driving motor 52 is connected with the ratchet wheel 53 through the key groove above the first gear 65, and the outer wall of the ratchet wheel 53 is connected with the ratchet gear 54.

[0099] The auxiliary mechanism 7 includes a rotating shaft 71 and a driven pulley 72, the rotating shaft 71 is rotationally connected inside the box body 1 and located in the same horizontal direction of the ratchet gear 54, the driven pulley 72 is connected with the top end of the rotating shaft 71 through the key groove, the bottom end of the rotating shaft 71 and located inside the box body 1 is connected with the fan blade 73 through the key groove, and the outer wall of the driven pulley 72 and the ratchet gear 54 is sleeved with the belt 55.

[0100] Please refer to Figure 12 : During the working process of the second embodiment, the driving motor 52 rotates counterclockwise, so the ratchet wheel 53 also rotates counterclockwise, and the counterclockwise rotating ratchet wheel 53 does not affect the rotating motion of the ratchet gear 54, when the cleaning frame 68 is switched from the working state to the initial state, the user needs to start the driving motor 52 to rotate clockwise to control the cleaning frame 68 to switch to the initial state.

[0101] Please refer to Figure 11 and Figure 12 : When the ratchet wheel 53 rotates clockwise, the clockwise rotating ratchet wheel 53 will mesh to drive the ratchet gear 54 to rotate, when the ratchet gear 54 rotates, the transmission belt 55 will affect the driven pulley 72 to drive the rotating shaft 71 to control the fan blade 73 to rotate inside the box body 1, and the fan blade 73 rotates to generate a blowing force inside the box body 1.

[0102] The ratchet gear 54 and the box body 1 are rotationally connected, and the bottom limit position of the fan blade 73 is higher than the top limit position of the moving plate 67.

[0103] The embodiment

[0104] When the cleaning frame 68 is switched from the working state to the initial state, the user needs to start the driving motor 52 to rotate clockwise. The clockwise rotating driving motor 52 will link to control the rotation of the fan blade 73 inside the box body 1, and generate a blowing force inside the box body 1. The blowing force can diffuse the impurities on the surface of the cleaned heat exchange pipe 9 inside the box body 1, which can avoid the accumulation of impurities on the bottom of the box body 1, and is beneficial to clean the impurities on the surface of the peeled heat exchange pipe 9.

[0105] The flue gas passage can be maintained unobstructed, ensuring the stable operation of the roasting furnace and the waste heat recovery system, avoiding production interruption caused by equipment failure, and also avoiding the secondary reaction of accumulated dust at high temperature to generate harmful substances, or excessive combustion caused by equipment efficiency reduction, further reducing environmental protection pressure.

[0106] The fourth embodiment is as follows:

[0107] The process for extracting beryllium from lithium-containing ore includes the following steps:

[0108] S1: ore pretreatment;

[0109] Raw material requirements: Li2O≥5%, BeO≥0.1%, Fe2O3≤1.5%;

[0110] Two-stage crushing: jaw crushing to 10mm→ball milling to 80-100 mesh;

[0111] Flotation reagents: sodium oleate 200g / t + water glass 500g / t, concentrate BeO enrichment to 1.2%;

[0112] S2: sulfate activation roasting;

[0113] Formula: ore powder: Na2SO4: CaO = 100: 35: 8 mass ratio;

[0114] Dynamic roasting: rotary kiln 750℃±20℃, residence time 120±5min;

[0115] The high-temperature flue gas generated during roasting enters the box body from the roasting furnace exhaust pipe after waste heat recovery, and the exhaust gas is absorbed by water to produce 20-30% dilute sulfuric acid for the leaching process;

[0116] S3: water leaching separation;

[0117] Leaching conditions: mix the roasted ore powder with water at a mass ratio of 1:4-6, and add 0.5-1.0% Na2CO3 as a solubility aid;

[0118] Control parameters: temperature 180-200℃, pressure 1.2-1.5MPa, time 3-4h;

[0119] S4: classification precipitation;

[0120] Primary precipitation: CO2 is passed into the leaching solution until pH = 7.0-7.5, and BeCO3·2H2O is precipitated;

[0121] Secondary precipitation: CO2 is continuously passed until pH = 6.0-6.5, and Li2CO3 by-product is recovered;

[0122] S5: Preparation of beryllium hydroxide;

[0123] Neutralization precipitation: ammonia is titrated until pH = 8.5±0.2, and aging is performed for 120 min.

[0124] Currently, the extraction of beryllium resources mainly faces the following technical bottlenecks:

[0125] 1. Limited raw materials: The traditional process relies on independent beryllium ore (BeO≥4%) such as beryl, and the recovery rate of low-grade beryllium (BeO 0.1%-0.5%) associated with lithium ore is less than 60%;

[0126] 2. Serious pollution: The current acid leaching method produces a large amount of acidic wastewater (pH<1), and the treatment cost accounts for more than 25% of the operating cost;

[0127] 3. Difficult separation: The chemical properties of lithium and beryllium are similar, and the separation coefficient α of conventional process is less than 5;

[0128] 4. Equipment corrosion: The annual corrosion amount of 316L stainless steel is more than 2mm due to strong acid medium.

[0129] This embodiment

[0130] Beryllium is converted into water-soluble BeSO4 by sodium sulfate activation roasting, and green extraction is achieved by using pressurized water leaching. CO2 fractional precipitation method is innovatively used to realize lithium-beryllium separation.

[0131] The above only describes the preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or direct / indirect application in other related technical fields within the concept of the present application, using the contents of the present application specification and drawings, are included in the patent protection scope of the present application.

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 and fixed 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. 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 plate; 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. 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. It also includes auxiliary mechanisms; The auxiliary mechanism includes a rotating shaft and a driven pulley, and a fan blade is connected to the bottom end of the rotating shaft and inside the housing via a keyway.

2. The lithium ore roasting waste heat recovery device according to claim 1, 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.

3. The lithium ore roasting waste heat recovery device according to claim 1, 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.

4. The lithium ore roasting waste heat recovery device according to claim 1, characterized in that, 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 rotating shaft is rotatably connected inside the housing and located in the same horizontal direction as the ratchet. The driven pulley is keyway connected to the top of the rotating shaft. The driven pulley and the outer wall of the ratchet are fitted with belts.

5. A lithium ore roasting waste heat recovery device according to claim 4, 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.

6. A process for extracting beryllium from lithium-bearing ore, characterized in that, The process of extracting beryllium from lithium-bearing ore using a lithium ore roasting waste heat recovery device as described in any one of claims 1-5 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 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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