A kind of high-efficiency evaporation equipment for aluminum oxide production and its use method

Abstract

The invention discloses an efficient evaporation device for aluminum oxide production and a method of using the same, and belongs to the technical field of aluminum oxide production. The efficient evaporation device for aluminum oxide production comprises an evaporation box, and also comprises: a liquid inlet pipe, which is fixedly arranged at the top of the evaporation box and is used to add mother liquid into the evaporation box; an exhaust pipe, which is fixedly arranged at the top of the evaporation box and is used to discharge water vapor in the evaporation box; an electric heating plate, which is fixedly arranged in the evaporation box and is used to heat the mother liquid and evaporate it; and a descaling component, which is arranged in the evaporation box and on the upper side of the electric heating plate. The invention enables the electric heating plate to heat only a layer of mother liquid flowing on its surface, thereby reducing the waiting time for the mother liquid to evaporate and increasing the evaporation conversion efficiency of the mother liquid. The descaling component is used to clean the carbon alkali precipitated by the mother liquid on the electric heating plate due to evaporation, thereby ensuring the heat transfer of the electric heating plate to the mother liquid, reducing the energy consumption for evaporation and ensuring the evaporation efficiency of the mother liquid.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum oxide production, and in particular to a high-efficiency evaporation device for aluminum oxide production and a use method thereof. Background Art

[0002] Alumina is a high-hardness compound, an ionized crystal that can be ionized at high temperatures, and is often used to make refractory materials. In the production process of alumina, mother liquor evaporation is one of the important processes in alumina production, responsible for maintaining the liquid balance in the circulation system, providing alkali liquor of appropriate concentration for preparing raw material slurry or dissolving bauxite, and removing carbon alkali and moisture accumulated in the production process.

[0003] In the prior art, the patent application number CN202222680743.0 discloses a highly efficient evaporation device for alumina production, including an evaporation box, a box door and an air inlet pipe connected to the inside of the evaporation box are provided on the side wall of the evaporation box, a feeding pipe connected to the inside of the evaporation box and an exhaust pipe connected to the inside of the evaporation box are provided on the upper side wall of the evaporation box, and a rotary stirring device and a vertical stirring device are provided in the evaporation box. The device can stir the raw materials vertically and horizontally by setting the stirring device, improve the production efficiency of alumina, mix the raw materials in the evaporation box evenly, and then evenly heat the raw materials in the evaporation box. However, in the specific use process, the raw materials in the evaporation box are evenly heated, so that the waiting time for the mother liquor to evaporate is long, and the evaporation efficiency is not high; and the long-term evaporation of the mother liquor will form carbon alkali attached to the inner wall of the evaporation box, which seriously affects the normal working state of the equipment, reduces the heat transfer and the mother liquor conversion efficiency, and at the same time increases the energy consumption of evaporation. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose a high-efficiency evaporation device for aluminum oxide production and a method of using the same.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A highly efficient evaporation device for aluminum oxide production, comprising an evaporation box, and further comprising:

[0007] A liquid inlet pipe, which is fixed on the top of the evaporation box and is used to add mother liquid into the evaporation box;

[0008] An exhaust pipe, the exhaust pipe is fixedly arranged on the top of the evaporation box and is used to discharge the water vapor in the evaporation box;

[0009] An electric heating plate, which is fixed in the evaporation box and is used to heat the mother liquid and evaporate it;

[0010] A descaling component, which is arranged in the evaporation box and on the upper side of the electric heating plate, and is used to remove carbon alkali attached to the electric heating plate;

[0011] Wherein, a pumping mechanism connected to the descaling assembly is arranged outside the evaporation box for pumping out the mother liquid that has not been evaporated by the electric heating plate.

[0012] Preferably, the electric heating plate is arranged obliquely in the evaporation box, a material discharge channel is formed between the two ends of the electric heating plate and the inner wall of the evaporation box, and a plurality of slow-flow arc grooves are arranged on the electric heating plate.

[0013] Preferably, the descaling assembly includes a reciprocating screw rotatably connected to the evaporator box, a sleeve is threadedly connected to the outer side of the reciprocating screw, an elastic telescopic rod is fixedly provided to the bottom of the sleeve, a scraper is provided at the end of the elastic telescopic rod away from the sleeve and is slidably connected to the inner wall of the evaporator box, the bottom wall of the scraper is movably abutted against the top wall of the electric heating plate, a drive motor is fixedly provided on the outer side of the evaporator box, and the output shaft of the drive motor passes through the evaporator box and is connected to the reciprocating screw.

[0014] Preferably, the exhaust mechanism includes an exhaust box fixedly mounted on the outside of the evaporator box, a piston being slidably connected to the exhaust box, the piston dividing the exhaust box into an upper cavity and a lower cavity, the upper cavity and the lower cavity being respectively connected to an upper exhaust assembly and a lower exhaust assembly, a sliding rod being fixedly mounted on the top of the piston, an end of the sliding rod away from the piston being slidable through the exhaust box and being connected to a force plate, an elastic element being sleeved on the outside of the sliding rod, the two ends of the elastic element being respectively connected to the exhaust box and the force plate, and a first cam being movably opposed to the force plate being fixedly mounted on the smooth section of the reciprocating screw.

[0015] Preferably, the upper exhaust assembly includes a first exhaust pipe and a first row of pipes connected to the upper cavity, the end of the first exhaust pipe away from the upper cavity is connected to the exhaust pipe, and the end of the first row of pipes away from the upper cavity passes through the exhaust box and the evaporation box in sequence and is connected to a nozzle.

[0016] Preferably, the lower exhaust assembly includes a second exhaust pipe and a second row of pipes connected to the lower cavity, the second exhaust pipe having one end away from the lower cavity passing through the evaporator box and extending to its inner bottom, and the second row of pipes having one end away from the lower cavity passing through the evaporator box and connected to the first row of pipes.

[0017] Preferably, one-way valves are provided in the first suction pipe, the first row of pipes, the second suction pipe and the second row of pipes.

[0018] Preferably, a filter is obliquely arranged in the evaporation box, a material discharge trough is opened at the bottom of the filter, a waste residue box is fixedly provided at the material discharge trough, a rotating rod is rotatably connected in the evaporation box, a second cam which is against the movement of the filter is arranged on the rotating rod, synchronous wheels are arranged on the rotating rod and the reciprocating screw rod, and a synchronous belt is arranged between the two synchronous wheels.

[0019] Preferably, the ends of the first cam and the second cam are rotatably connected to rollers via pins.

[0020] The present invention also discloses a method for using a highly efficient evaporation device for aluminum oxide production. Using the highly efficient evaporation device for aluminum oxide production comprises the following steps:

[0021] S1: During operation, the mother liquid is introduced into the evaporation box through the liquid inlet pipe. The mother liquid in the evaporation box falls onto the electric heating plate, and the mother liquid slides down along the surface of the electric heating plate. The multiple slow-flow arc grooves arranged on the electric heating plate increase the sliding distance of the mother liquid and extend the heating time of the mother liquid. A layer of water flowing on the surface of the electric heating plate is quickly heated and evaporated, and the evaporated water vapor moves upward and is discharged through the exhaust pipe;

[0022] S2: When the mother liquor evaporates, carbon alkali will be precipitated on the surface of the electric heating plate. The driving motor is controlled to operate so that the output shaft of the driving motor drives the reciprocating screw to rotate in the evaporation box. When the reciprocating screw rotates, the sleeve connected to the outer thread moves back and forth along its axial direction. The sleeve drives the scraper to scrape the carbon alkali on the surface of the electric heating plate through the elastic telescopic rod. The elastic telescopic rod automatically expands and contracts as the height between the sleeve and the electric heating plate changes. The reciprocating scraper scrapes the carbon alkali on the surface of the electric heating plate to the discharge channel, and the carbon alkali falls onto the filter screen along the discharge channel;

[0023] S3: A part of the mother liquor flowing on the electric heating plate has not yet evaporated and carries the carbon alkali along the surface of the electric heating plate through the discharge channel. The filter screen intercepts the carbon alkali in the water body, while the mother liquor passes through the filter screen and falls to the bottom of the evaporation box;

[0024] S4: When the reciprocating screw rotates, the rotating rod is driven to rotate through the synchronous wheel and the synchronous belt. When the rotating rod rotates, the second cam connected to the outside intermittently presses the filter screen, so that the filter screen continues to shake in the process of intercepting carbon alkali, so that the carbon alkali dropped on the filter screen is shaken into the waste slag box, and the shaking filter screen accelerates the mother liquor water droplets attached to the outside of the filter screen to quickly fall to the bottom of the evaporation box;

[0025] S5: When the reciprocating screw rotates, the first cam connected thereto intermittently presses the force plate;

[0026] When the first cam presses against the force plate, the force plate drives the piston to move downward in the pumping box through the sliding rod, the space of the upper cavity becomes larger and the space of the lower cavity becomes smaller, the piston squeezes the mother liquid extracted from the lower cavity, the mother liquid in the lower cavity is introduced into the first cavity through the second row of pipes and sprayed on the surface of the electric heating plate again through the nozzle, the unevaporated mother liquid is circulated and heated, and the upper cavity extracts the high-temperature water vapor in the exhaust pipe through the first extraction pipe;

[0027] When the first cam no longer presses against the force-bearing plate, the force-bearing plate is reset under the elastic force of the elastic element on the outer side of the sliding rod, the space of the upper cavity becomes smaller and the space of the lower cavity becomes larger, the lower cavity extracts the mother liquid that has not yet evaporated at the bottom of the evaporator through the second suction pipe, and the upper cavity discharges the high-temperature water vapor previously extracted from the upper cavity through the nozzle through the first row of pipes. The discharged high-temperature water vapor heats the upper surface of the water flowing on the electric heating plate and accelerates the air flow around it, so that the mother liquid flowing on the surface of the electric heating plate evaporates quickly.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The highly efficient evaporation equipment and the use method for alumina production reduce the waiting time for evaporation of the mother liquid by making the electric heating plate heat only a layer of mother liquid flowing on the surface thereof, so that the evaporation conversion efficiency of the mother liquid is high, and the carbon alkali precipitated by evaporation of the mother liquid on the surface of the electric heating plate is cleaned by the descaling component, so as to ensure the heat transfer of the electric heating plate to the mother liquid, reduce the energy consumption of evaporation, and ensure the evaporation efficiency of the mother liquid;

[0030] 2. The highly efficient evaporation equipment for aluminum oxide production and the method of using the same can extend the flow time of the mother liquid in a limited space by setting a plurality of slow-flow arc grooves on the electric heating plate, thereby extending the evaporation time of the mother liquid by the electric heating plate and ensuring the evaporation effect of the mother liquid by the electric heating plate;

[0031] 3. The highly efficient evaporation equipment for aluminum oxide production and the method of using the same can heat the mother liquid that has not been evaporated by the electric heating plate and has fallen to the bottom of the evaporation box by driving the pumping mechanism to work when the descaling component is working, and the high-temperature water vapor in the exhaust pipe heats the upper surface of the water flowing on the electric heating plate, while accelerating the air flow around it, further improving the evaporation efficiency of the mother liquid;

[0032] 4. The high-efficiency evaporation equipment for alumina production and the use method thereof drive the second cam to intermittently press the filter screen through the rotating rod, so that the filter screen continues to shake in the process of intercepting carbon alkali, and the carbon alkali dropped on the filter screen is shaken into the waste slag box. On the one hand, it is convenient for separating and collecting carbon alkali and reducing the workload of subsequent staff. On the other hand, it avoids the carbon alkali placed on the filter screen to hinder the rapid falling of the mother liquor. The shaking filter screen accelerates the mother liquor water droplets attached to the outside thereof to fall to the bottom of the evaporation box, so that the unevaporated mother liquor quickly aggregates at the bottom of the evaporation box to form water masses and is heated again under the pumping action of the lower pumping assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0034] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0035] Figure 3 For the present invention Figure 2 A partial enlarged structural diagram of the middle part;

[0036] Figure 4 It is a schematic diagram of the cross-sectional structure of the present invention;

[0037] Figure 5 For the present invention Figure 4 A schematic diagram of the partially enlarged structure of the middle B part;

[0038] Figure 6 For the present invention Figure 4 The main view of

[0039] Figure 7 It is a structural schematic diagram of the electric heating plate of the present invention;

[0040] Figure 8 It is a schematic cross-sectional structure diagram of the extraction box of the present invention;

[0041] Fig. 9 It is a schematic diagram of the connection structure of two synchronous wheels of the present invention;

[0042] Fig.10 is a schematic diagram of the external structure of the first cam of the present invention;

[0043] Fig.11 It is a schematic diagram of the cross-sectional structure of the evaporation box of the present invention.

[0044] In the figure: 1. evaporation box; 2. liquid inlet pipe; 3. exhaust pipe; 4. electric heating plate; 401. feeding channel; 402. slow-flow arc groove; 5. reciprocating screw rod; 501. sleeve; 502. elastic telescopic rod; 503. scraper; 504. driving motor; 505. first cam; 6. extraction box; 601. piston; 6011. slide rod; 6012. force plate; 6013. elastic element; 602. upper cavity; 6021. first extraction tube; 6022. first row of tubes; 6023. nozzle; 603. lower cavity; 6031. second extraction tube; 6032. second row of tubes; 7. filter screen; 701. feeding trough; 702. waste slag box; 8. rotating rod; 801. second cam; 9. synchronous wheel; 10. roller. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0046] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the 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.

[0047] Example 1: Reference Figure 1 , Figure 2 , Figure 4 , Figure 6 , Figure 7 and Fig.11 , an efficient evaporation device for aluminum oxide production, comprising an evaporation box 1, and also comprising:

[0048] A liquid inlet pipe 2, which is fixed on the top of the evaporation box 1 and is used to add mother liquid into the evaporation box 1;

[0049] An exhaust pipe 3, which is fixed on the top of the evaporation box 1 and is used to discharge the water vapor in the evaporation box 1;

[0050] An electric heating plate 4, which is fixed in the evaporation box 1 and is used to heat the mother liquid and evaporate it;

[0051] A descaling component is arranged in the evaporation box 1 and placed on the upper side of the electric heating plate 4, and is used to remove carbon alkali attached to the electric heating plate 4;

[0052] Wherein, a pumping mechanism connected to the descaling assembly is arranged outside the evaporation box 1 for pumping out the mother liquid that has not been evaporated by the electric heating plate 4 .

[0053] Furthermore, the electric heating plate 4 is tiltedly arranged in the evaporation box 1 , and a material discharge channel 401 is formed between the two ends of the electric heating plate 4 and the inner wall of the evaporation box 1 , and a plurality of slow-flow arc grooves 402 are arranged on the electric heating plate 4 .

[0054] Specifically, during operation, the mother liquid is introduced into the evaporation box 1 through the liquid inlet pipe 2, and the mother liquid in the evaporation box 1 falls onto the electric heating plate 4, and the mother liquid slides down along the surface of the electric heating plate 4. The multiple slow-flow arc grooves 402 arranged on the electric heating plate 4 increase the sliding distance of the mother liquid and extend the heating time of the mother liquid. A thin layer of water flowing on the surface of the electric heating plate 4 is quickly heated and evaporated, so that the evaporation conversion efficiency of the mother liquid is high, and the evaporated water vapor moves upward and is discharged through the exhaust pipe 3. A guide slope is arranged on the top of the evaporation box 1 for guiding the water vapor. When the mother liquid evaporates, carbon alkali will precipitate on the surface of the electric heating plate 4. The descaling component is used to clean the carbon alkali precipitated by the mother liquid on the surface of the electric heating plate 4 due to evaporation, thereby ensuring the heat transfer of the electric heating plate 4 to the mother liquid, reducing the energy consumption of evaporation, and ensuring the evaporation efficiency of the mother liquid. When the descaling component is working, it drives the pumping mechanism to work, and can circulate and heat the mother liquid that is not evaporated by the electric heating plate 4 and falls on the bottom of the evaporation box 1. The bottom of the evaporation box 1 is provided with a guide slope for guiding the unevaporated mother liquid, and the high-temperature water vapor in the exhaust pipe 3 heats the upper surface of the water body flowing on the electric heating plate 4, while accelerating the air flow around it, further improving the evaporation efficiency of the mother liquid.

[0055] Example 2: Reference Figure 4 , Figure 6 , Figure 7 and Fig. 9 , a high-efficiency evaporation equipment for alumina production, based on Example 1, further, a descaling component includes a reciprocating screw 5 rotatably connected to the evaporation box 1, a sleeve 501 is threadedly connected to the outer side of the reciprocating screw 5, an elastic telescopic rod 502 is fixedly provided at the bottom of the sleeve 501, and a scraper 503 is provided at one end of the elastic telescopic rod 502 away from the sleeve 501 and is slidably connected to the inner wall of the evaporation box 1, the bottom wall of the scraper 503 is movably abutted against the top wall of the electric heating plate 4, a drive motor 504 is fixedly provided on the outer side of the evaporation box 1, and the output shaft of the drive motor 504 passes through the evaporation box 1 and is connected to the reciprocating screw 5.

[0056] Specifically, the mother liquor is introduced into the evaporation box 1 through the liquid inlet pipe 2, and the mother liquor entering the evaporation box 1 falls onto the electric heating plate 4. A thin layer of water flowing on the surface of the electric heating plate 4 is rapidly heated and evaporated. When the mother liquor evaporates, carbon alkali will precipitate on the surface of the electric heating plate 4. The drive motor 504 is controlled to operate so that the output shaft of the drive motor 504 drives the reciprocating screw 5 to rotate in the evaporation box 1. When the reciprocating screw 5 rotates, the sleeve 501 connected by the outer thread moves back and forth along its axial direction. The sleeve 501 drives the scraper 503 to scrape the carbon alkali on the surface of the electric heating plate 4 through the elastic telescopic rod 502. The elastic telescopic rod 502 automatically retracts and contracts as the height between the sleeve 501 and the electric heating plate 4 changes. The reciprocating scraper 503 scrapes the carbon alkali on the surface of the electric heating plate 4 to the discharge channel 401, thereby ensuring the heat transfer of the electric heating plate 4 to the mother liquor, reducing the energy consumption of evaporation, and ensuring the evaporation efficiency of the mother liquor.

[0057] Example 3: Reference Figure 1-9 , a high-efficiency evaporation equipment for alumina production, based on Example 2, further, the exhaust mechanism includes an exhaust box 6 fixedly arranged on the outside of the evaporation box 1, a piston 601 is slidably connected in the exhaust box 6, the piston 601 divides the exhaust box 6 into an upper cavity 602 and a lower cavity 603, the upper cavity 602 and the lower cavity 603 are respectively connected with an upper exhaust assembly and a lower exhaust assembly, a sliding rod 6011 is fixedly arranged on the top of the piston 601, one end of the sliding rod 6011 away from the piston 601 can slidably pass through the exhaust box 6 and is connected with a force plate 6012, an elastic element 6013 is sleeved on the outside of the sliding rod 6011, and the two ends of the elastic element 6013 are respectively connected to the exhaust box 6 and the force plate 6012, and the smooth section of the reciprocating screw rod 5 is fixedly provided with a first cam 505 that is movably against the force plate 6012.

[0058] Furthermore, the upper exhaust assembly includes a first exhaust pipe 6021 and a first row of pipes 6022 connected to the upper cavity 602. The end of the first exhaust pipe 6021 away from the upper cavity 602 is connected to the exhaust pipe 3, and the end of the first row of pipes 6022 away from the upper cavity 602 passes through the exhaust box 6 and the evaporation box 1 in sequence and is connected to a nozzle 6023.

[0059] Furthermore, the lower exhaust assembly includes a second exhaust pipe 6031 and a second row of pipes 6032 connected to the lower cavity 603, the end of the second exhaust pipe 6031 away from the lower cavity 603 passes through the evaporator box 1 and extends to its inner bottom, and the end of the second row of pipes 6032 away from the lower cavity 603 passes through the evaporator box 1 and is connected to the first row of pipes 6022.

[0060] Furthermore, one-way valves are disposed in the first suction pipe 6021 , the first row of pipes 6022 , the second suction pipe 6031 , and the second row of pipes 6032 .

[0061] Specifically, when the mother liquid evaporates, carbon alkali will be precipitated on the surface of the electric heating plate 4. The driving motor 504 is controlled to operate so that the output shaft of the driving motor 504 drives the reciprocating screw 5 to rotate in the evaporation box 1. When the reciprocating screw 5 rotates, the sleeve 501 connected with the outer thread moves back and forth along its axial direction. The sleeve 501 drives the scraper 503 to scrape the carbon alkali on the surface of the electric heating plate 4 through the elastic telescopic rod 502. The elastic telescopic rod 502 automatically retracts as the height between the sleeve 501 and the electric heating plate 4 changes. The reciprocating scraper 503 scrapes the carbon alkali on the surface of the electric heating plate 4 to the unloading channel 401. When the reciprocating screw 5 rotates, the first cam 505 connected thereto intermittently presses the force plate 6012.

[0062] When the first cam 505 presses against the force plate 6012, the force plate 6012 drives the piston 601 to move downward in the pumping box 6 through the slide rod 6011, the space of the upper cavity 602 becomes larger and the space of the lower cavity 603 becomes smaller, the piston 601 squeezes the mother liquid extracted from the lower cavity 603, the mother liquid in the lower cavity 603 is introduced into the first row of pipes 6022 through the second row of pipes 6032 and re-sprayed on the surface of the electric heating plate 4 through the nozzle 6023, the unevaporated mother liquid is cyclically heated, and the upper cavity 602 extracts the high-temperature water vapor in the exhaust pipe 3 through the first extraction pipe 6021;

[0063] When the first cam 505 no longer presses against the force-bearing plate 6012, the force-bearing plate 6012 is reset under the elastic force of the elastic element 6013 outside the sliding rod 6011, the space of the upper cavity 602 becomes smaller and the space of the lower cavity 603 becomes larger, the lower cavity 603 extracts the mother liquid that has not yet evaporated at the bottom of the evaporation box 1 through the second suction pipe 6031, and the upper cavity 602 discharges the high-temperature water vapor previously extracted from the upper cavity 602 through the nozzle 6023 through the first row of pipes 6022, and the discharged high-temperature water vapor heats the upper surface of the water body flowing on the electric heating plate 4, recycles the heat energy, reduces the energy consumption of evaporation, and accelerates the air flow around it, so that the mother liquid flowing on the surface of the electric heating plate 4 evaporates quickly, thereby improving the evaporation efficiency of the mother liquid.

[0064] Example 4: Reference Figure 4 , Figure 6 and Fig. 9 , a high-efficiency evaporation equipment for alumina production. On the basis of Example 3, further, a filter screen 7 is obliquely arranged in the evaporation box 1, and a material discharge trough 701 is opened at the bottom of the filter screen 7 of the evaporation box 1. The evaporation box 1 is placed at the material discharge trough 701 and a waste slag box 702 is fixed thereon. A rotating rod 8 is rotatably connected in the evaporation box 1, and a second cam 801 that is movably opposed to the filter screen 7 is arranged on the rotating rod 8. Synchronous wheels 9 are arranged on the rotating rod 8 and the reciprocating screw rod 5, and a synchronous belt is arranged between the two synchronous wheels 9.

[0065] Specifically, when the mother liquid evaporates, carbon alkali will be precipitated on the surface of the electric heating plate 4. The driving motor 504 is controlled to operate so that the output shaft of the driving motor 504 drives the reciprocating screw 5 to rotate in the evaporation box 1. When the reciprocating screw 5 rotates, the sleeve 501 connected with the outer thread moves back and forth along its axial direction. The sleeve 501 drives the scraper 503 to scrape the carbon alkali on the surface of the electric heating plate 4 through the elastic telescopic rod 502. The elastic telescopic rod 502 automatically retracts as the height between the sleeve 501 and the electric heating plate 4 changes. The reciprocating scraper 503 scrapes the carbon alkali on the surface of the electric heating plate 4 to the discharge channel 401, and the carbon alkali falls onto the filter screen 7 along the discharge channel 401.

[0066] A part of the mother liquid flowing on the electric heating plate 4 has not yet evaporated and carries the carbon alkali along the surface of the electric heating plate 4 through the material discharge channel 401. The filter screen 7 intercepts the carbon alkali in the water body, while the mother liquid passes through the filter screen 7 and falls to the bottom of the evaporation box 1.

[0067] When the reciprocating screw 5 rotates, the rotating rod 8 is driven to rotate through the synchronous wheel 9 and the synchronous belt. When the rotating rod 8 rotates, the second cam 801 connected to the outside intermittently presses the filter 7, so that the filter 7 continues to shake in the process of intercepting carbon alkali, and the carbon alkali dropped on the filter 7 is shaken into the waste residue box 702. On the one hand, it is convenient for separating and collecting carbon alkali and reducing the workload of subsequent staff. On the other hand, it avoids the carbon alkali placed on the filter 7 to hinder the rapid falling of the mother liquor. The shaking filter 7 accelerates the mother liquor water droplets attached to its outside to fall quickly to the bottom of the evaporation box 1, so that the unevaporated mother liquor quickly aggregates at the bottom of the evaporation box 1 to form water masses and is heated again under the pumping action of the lower pumping assembly.

[0068] Example 5: Reference Fig.10 , a high-efficiency evaporation device for aluminum oxide production, based on Example 4, further, the ends of the first cam 505 and the second cam 801 are both rotatably connected to the roller 10 through a pin shaft.

[0069] Specifically, by arranging rollers 10 at the ends of the first cam 505 and the second cam 801, the first cam 505 contacts the force-bearing plate 6012 through the roller 10 when pressing against the force-bearing plate 6012, and the second cam 801 contacts the filter screen 7 through the roller 10 when abutting against the filter screen 7, thereby reducing the wear of the first cam 505 and the second cam 801 during rotation and ensuring their service life.

[0070] The present invention also discloses a method for using a high-efficiency evaporation device for aluminum oxide production, including a high-efficiency evaporation device for aluminum oxide production, comprising the following steps:

[0071] S1: During operation, the mother liquid is introduced into the evaporation box 1 through the liquid inlet pipe 2. The mother liquid in the evaporation box 1 falls onto the electric heating plate 4, and the mother liquid slides down along the surface of the electric heating plate 4. The multiple slow-flow arc grooves 402 provided on the electric heating plate 4 increase the sliding distance of the mother liquid and extend the heating time of the mother liquid. A thin layer of water flowing on the surface of the electric heating plate 4 is quickly heated and evaporated, and the evaporated water vapor moves upward and is discharged through the exhaust pipe 3;

[0072] S2: When the mother liquor evaporates, carbon alkali will be precipitated on the surface of the electric heating plate 4. The driving motor 504 is controlled to operate so that the output shaft of the driving motor 504 drives the reciprocating screw 5 to rotate in the evaporation box 1. When the reciprocating screw 5 rotates, the sleeve 501 connected with the outer thread moves back and forth along its axial direction. The sleeve 501 drives the scraper 503 to scrape the carbon alkali on the surface of the electric heating plate 4 through the elastic telescopic rod 502. The elastic telescopic rod 502 automatically expands and contracts as the height between the sleeve 501 and the electric heating plate 4 changes. The reciprocating scraper 503 scrapes the carbon alkali on the surface of the electric heating plate 4 to the discharge channel 401, and the carbon alkali falls onto the filter screen 7 along the discharge channel 401.

[0073] S3: A part of the mother liquor flowing on the electric heating plate 4 has not yet evaporated and carries the carbon alkali along the surface of the electric heating plate 4 through the discharge channel 401, the filter screen 7 intercepts the carbon alkali in the water, and the mother liquor passes through the filter screen 7 and falls to the bottom of the evaporation box 1;

[0074] S4: When the reciprocating screw 5 rotates, the rotating rod 8 is driven to rotate through the synchronous wheel 9 and the synchronous belt. When the rotating rod 8 rotates, the second cam 801 connected to the outside intermittently presses the filter screen 7, so that the filter screen 7 continues to shake in the process of intercepting carbon alkali, so that the carbon alkali dropped on the filter screen 7 is shaken into the waste residue box 702, and the shaking filter screen 7 accelerates the mother liquid water droplets attached to the outside of the filter screen 7 to quickly fall to the bottom of the evaporation box 1;

[0075] S5: When the reciprocating screw rod 5 rotates, the first cam 505 connected thereto intermittently presses the force-bearing plate 6012;

[0076] When the first cam 505 presses against the force plate 6012, the force plate 6012 drives the piston 601 to move downward in the pumping box 6 through the slide rod 6011, the space of the upper cavity 602 becomes larger and the space of the lower cavity 603 becomes smaller, the piston 601 squeezes the mother liquid extracted from the lower cavity 603, the mother liquid in the lower cavity 603 is introduced into the first row of pipes 6022 through the second row of pipes 6032 and re-sprayed on the surface of the electric heating plate 4 through the nozzle 6023, the unevaporated mother liquid is cyclically heated, and the upper cavity 602 extracts the high-temperature water vapor in the exhaust pipe 3 through the first extraction pipe 6021;

[0077] When the first cam 505 no longer presses against the force-bearing plate 6012, the force-bearing plate 6012 is reset under the elastic force of the elastic element 6013 outside the sliding rod 6011, the space of the upper cavity 602 becomes smaller and the space of the lower cavity 603 becomes larger, the lower cavity 603 extracts the mother liquid that has not yet evaporated at the bottom of the evaporation box 1 through the second suction pipe 6031, and the upper cavity 602 discharges the high-temperature water vapor previously extracted from the upper cavity 602 through the nozzle 6023 through the first row of pipes 6022. The discharged high-temperature water vapor heats the upper surface of the water body flowing on the electric heating plate 4 and accelerates the air flow around it, so that the mother liquid flowing on the surface of the electric heating plate 4 evaporates quickly.

[0078] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An efficient evaporation device for alumina production, comprising an evaporation box (1), characterized in that: Also includes: A liquid inlet pipe (2), the liquid inlet pipe (2) being fixedly arranged on the top of the evaporation box (1) and being used for adding mother liquid into the evaporation box (1); An exhaust pipe (3), the exhaust pipe (3) being fixedly arranged on the top of the evaporation box (1) and being used for exhausting water vapor in the evaporation box (1); An electric heating plate (4), the electric heating plate (4) being fixedly arranged in the evaporation box (1) and used for heating the mother liquid and evaporating it; A descaling component, the descaling component is arranged in the evaporation box (1) and placed on the upper side of the electric heating plate (4), and is used to remove carbon alkali attached to the electric heating plate (4); Wherein, an exhaust mechanism connected to the descaling component is arranged outside the evaporation box (1) and is used to exhaust the mother liquid that has not been evaporated by the electric heating plate (4); The descaling assembly comprises a reciprocating screw (5) rotatably connected to the inside of the evaporation box (1); the outer side of the reciprocating screw (5) is threadedly connected to a sleeve (501); an elastic telescopic rod (502) is fixedly provided at the bottom of the sleeve (501); an end of the elastic telescopic rod (502) away from the sleeve (501) is provided with a scraper (503) slidably connected to the inner wall of the evaporation box (1); the bottom wall of the scraper (503) is movably abutted against the top wall of the electric heating plate (4); a driving motor (504) is fixedly provided on the outer side of the evaporation box (1); an output shaft of the driving motor (504) passes through the evaporation box (1) and is connected to the reciprocating screw (5); The pumping mechanism comprises a pumping box (6) fixedly arranged on the outside of the evaporation box (1), a piston (601) being slidably connected inside the pumping box (6), the piston (601) dividing the pumping box (6) into an upper cavity (602) and a lower cavity (603), the upper cavity (602) and the lower cavity (603) being respectively connected to an upper pumping assembly and a lower pumping assembly, a sliding rod (6011) being fixedly arranged on the top of the piston (601), an end of the sliding rod (6011) away from the piston (601) being slidably passed through the pumping box (6) and being connected to a force plate (6012), an elastic element (6013) being sleeved on the outside of the sliding rod (6011), two ends of the elastic element (6013) being respectively connected to the pumping box (6) and the force plate (6012), and a first cam (505) being movably abutted against the force plate (6012) being fixedly arranged on the smooth section of the reciprocating screw rod (5); The upper exhaust assembly comprises a first exhaust pipe (6021) and a first row of pipes (6022) connected to the upper cavity (602); an end of the first exhaust pipe (6021) away from the upper cavity (602) is connected to the exhaust pipe (3); an end of the first row of pipes (6022) away from the upper cavity (602) passes through the exhaust box (6) and the evaporation box (1) in sequence and is connected to a nozzle (6023); The lower extraction assembly comprises a second extraction pipe (6031) and a second row of pipes (6032) connected to the lower cavity (603); an end of the second extraction pipe (6031) away from the lower cavity (603) passes through the evaporation box (1) and extends toward the inner bottom thereof; an end of the second row of pipes (6032) away from the lower cavity (603) passes through the evaporation box (1) and is connected to the first row of pipes (6022); One-way valves are provided in the first extraction tube (6021), the first row of tubes (6022), the second extraction tube (6031) and the second row of tubes (6032).

2. The efficient evaporation equipment for aluminum oxide production according to claim 1, characterized in that: The electric heating plate (4) is arranged obliquely in the evaporation box (1), a material discharge channel (401) is formed between the two ends of the electric heating plate (4) and the inner wall of the evaporation box (1), and a plurality of slow-flow arc grooves (402) are arranged on the electric heating plate (4).

3. The efficient evaporation equipment for aluminum oxide production according to claim 2, characterized in that: A filter screen (7) is also obliquely arranged in the evaporation box (1); a material discharge trough (701) is provided at the bottom of the evaporation box (1) placed on the filter screen (7); a waste slag box (702) is fixedly provided at the material discharge trough (701) of the evaporation box (1); a rotating rod (8) is rotatably connected in the evaporation box (1); a second cam (801) is arranged on the rotating rod (8) and is movably opposed to the filter screen (7); a synchronous wheel (9) is arranged on the rotating rod (8) and the reciprocating screw rod (5); and a synchronous belt is arranged between the two synchronous wheels (9).

4. The efficient evaporation equipment for aluminum oxide production according to claim 3, characterized in that: The ends of the first cam (505) and the second cam (801) are rotatably connected to rollers (10) via pins.

5. A method for using a highly efficient evaporation device for aluminum oxide production according to claim 4, characterized in that: The following steps are involved: S1: During operation, the mother liquid is introduced into the evaporation box (1) through the liquid inlet pipe (2). The mother liquid in the evaporation box (1) falls onto the electric heating plate (4). The mother liquid slides down along the surface of the electric heating plate (4). The plurality of slow-flow arc grooves (402) provided on the electric heating plate (4) increase the sliding distance of the mother liquid and prolong the heating time of the mother liquid. A layer of water flowing on the surface of the electric heating plate (4) is rapidly heated and evaporated. The evaporated water vapor moves upward and is discharged through the exhaust pipe (3). S2: When the mother liquor evaporates, carbon alkali will be precipitated on the surface of the electric heating plate (4). The driving motor (504) is controlled to operate so that the output shaft of the driving motor (504) drives the reciprocating screw (5) to rotate in the evaporation box (1). When the reciprocating screw (5) rotates, the sleeve (501) connected to the outer thread moves back and forth along its axial direction. The sleeve (501) drives the scraper (503) to scrape the carbon alkali on the surface of the electric heating plate (4) through the elastic telescopic rod (502). The elastic telescopic rod (502) automatically expands and contracts as the height between the sleeve (501) and the electric heating plate (4) changes. The reciprocating scraper (503) scrapes the carbon alkali on the surface of the electric heating plate (4) to the discharge channel (401). The carbon alkali falls onto the filter screen (7) along the discharge channel (401); S3: A portion of the mother liquor flowing on the electric heating plate (4) has not yet evaporated and carries the carbon alkali with it, and falls along the surface of the electric heating plate (4) through the discharge channel (401). The filter (7) intercepts the carbon alkali in the water body, while the mother liquor passes through the filter (7) and falls to the bottom of the evaporation box (1); S4: When the reciprocating screw (5) rotates, the rotating rod (8) is driven to rotate through the synchronous wheel (9) and the synchronous belt. When the rotating rod (8) rotates, the second cam (801) connected to the outside intermittently presses the filter screen (7), so that the filter screen (7) continues to shake in the process of intercepting the carbon alkali, so that the carbon alkali dropped on the filter screen (7) is shaken into the waste residue box (702), and the shaking filter screen (7) accelerates the mother liquor water droplets attached to the outside of the filter screen (7) to quickly fall to the bottom of the evaporation box (1); S5: When the reciprocating screw rod (5) rotates, the first cam (505) connected thereto intermittently presses against the force-bearing plate (6012); When the first cam (505) presses against the force-bearing plate (6012), the force-bearing plate (6012) drives the piston (601) to move downward in the pumping box (6) through the sliding rod (6011), the space of the upper chamber (602) becomes larger and the space of the lower chamber (603) becomes smaller, the piston (601) squeezes the mother liquid extracted from the lower chamber (603), the mother liquid in the lower chamber (603) is introduced into the first row of pipes (6022) through the second row of pipes (6032) and is sprayed again on the surface of the electric heating plate (4) through the nozzle (6023), the mother liquid that has not evaporated is cyclically heated, and the upper chamber (602) extracts high-temperature water vapor in the exhaust pipe (3) through the first extraction pipe (6021); When the first cam (505) no longer presses against the force-bearing plate (6012), the force-bearing plate (6012) is reset under the elastic force of the elastic element (6013) outside the sliding rod (6011), the space of the upper cavity (602) becomes smaller and the space of the lower cavity (603) becomes larger, the lower cavity (603) extracts the mother liquid that has not yet evaporated at the bottom of the evaporation box (1) through the second extraction pipe (6031), and the upper cavity (602) discharges the high-temperature water vapor previously extracted from the upper cavity (602) through the nozzle (6023) through the first row of pipes (6022), the discharged high-temperature water vapor heats the upper surface of the water body flowing on the electric heating plate (4), and accelerates the air flow around it, so that the mother liquid flowing on the surface of the electric heating plate (4) evaporates quickly.

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