Environment-friendly impurity removal and recycling device for processing lime milk for aluminum oxide

Abstract

The invention relates to the technical field of alumina production, in particular to an environment-friendly alumina lime milk processing impurity removal recycling device which comprises a smashing box, a reaction box, a recycling box and a liquid storage box which are sequentially communicated, a reaction bin and a roasting bin are formed in the reaction box through partition plates, and a separation mechanism is rotatably arranged in the recycling box; the separating mechanism comprises a separating cylinder driving motor and a separating cylinder, a filtering hole is formed in the separating cylinder, and a filtering membrane is arranged on the filtering hole. After circulating mother liquor enters the recycling box, a CaCO3 precipitate filtering membrane generated by reaction is blocked outside a separation barrel, the mother liquor enters the liquid storage box through a filtrate drainage pipe to be stored, and the mother liquor falls into the recycling box under the action of gravity along with gradual increase of CaCO3 precipitate aggregation, so that the mother liquor is recycled, and the recycling efficiency is improved. The blockage of the filtering membrane caused by CaCO3 precipitation is avoided, and the recycling of the mother liquor is ensured while the NaOH is recycled.

Description

Technical Field

[0001] The present invention relates to an impurity removal and recycling device, in particular to an environmentally friendly impurity removal and recycling device for processing lime milk for alumina, belonging to the technical field of alumina production. Background Art

[0002] The Bayer process is the main method for producing alumina, and its output accounts for about 95% of the world's total alumina production. In the process of producing alumina by the Bayer process, lime milk plays an important role. The addition of lime can increase the activity of bauxite and promote the dissolution reaction of bauxite, thereby increasing the dissolution rate. During the crude liquor refining process, lime milk is added to the crude liquor as a filter aid, reacting with sodium aluminate solution to generate hydrated calcium aluminate, forming a loose and porous filter medium, and improving the filtration effect of the leaf filter.

[0003] During the evaporation of the mother liquor, some sodium carbonate crystals will precipitate. In order to recover this alkali, the sodium carbonate is causticized with lime dissolved in water to convert it into sodium hydroxide, which is used to dissolve the next batch of bauxite. Therefore, recovering sodium hydroxide helps to improve resource utilization. However, the existing equipment does not completely remove impurities during the recovery process, resulting in low quality of the sodium hydroxide solution, which in turn affects the effect of producing alumina from the next batch of bauxite and reduces resource utilization.

[0004] Therefore, it is urgent to improve the lime milk processing impurity removal and recycling device to solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an environmentally friendly impurity removal and recycling device for processing lime milk for alumina. After the circulating mother liquor enters the interior of the recovery box, the CaCO3 precipitation filter membrane generated by the reaction is blocked on the outside of the separation cylinder, and the mother liquor enters the interior of the liquid storage tank through the filtrate drain pipe for storage. As the CaCO3 precipitation accumulates gradually, it falls into the interior of the recovery box under the action of gravity, avoiding clogging of the filter membrane by the CaCO3 precipitation, and ensuring the recycling of the mother liquor while recovering NaOH.

[0006] In order to achieve the above objectives, the main technical solutions adopted by the present invention include: An environmentally friendly impurity removal and recycling device for lime milk processing of alumina, comprising a crushing box, a reaction box, a recovery box, and a liquid storage box connected in sequence. The interior of the reaction box is formed with a reaction chamber and a roasting chamber by a partition plate. The reaction chamber is connected to the roasting chamber through a material injection port, and a stop valve is fixedly installed inside the material injection port. The reaction chamber is connected with the interior of the recovery box through a water pump, and a separation mechanism is rotatably provided inside the recovery box, and the separation mechanism includes a separation drum driving motor and a separation drum, and the separation drum driving motor is used to rotate the separation drum, and three groups of separation stirring teeth are provided on the separation drum, and a plurality of filter holes are opened on the separation drum between every two groups of the separation stirring teeth, and the recovery box is connected with the interior of the separation drum through the filter holes, and a filter membrane is provided on the filter holes, and a sealing slide is rotatably provided at one end of the separation drum, and the middle part of the sealing slide is connected with the interior of the roasting chamber through a first air guide pipe, and the lower part of the first air guide pipe is connected with the interior of the liquid storage tank through a filtered liquid drain pipe on the sealing slide; The other end of the separation cylinder is fixedly connected to a separation driven gear, and the separation driven gear is used to rotate the separation cylinder. A second air duct is rotatably provided in the middle of the separation driven gear, and the second air duct is connected to the interior of the roasting bin.

[0007] Preferably, a separation drive gear is provided at the output end of the separation drum drive motor, and a transmission gear is rotatably provided on one side of the separation drive gear. The separation drive gear is meshed and connected with the transmission gear, and the separation drive gear is used to rotate the transmission gear. The transmission gear is meshed and connected with the separation driven gear, and the transmission gear is used to rotate the separation driven gear, thereby driving the separation drum to rotate.

[0008] Preferably, the input end of the water pump is connected to a water pump inlet pipe, the water pump inlet pipe is connected to the reaction chamber inside the reaction box, one side of the water pump inlet pipe is fixedly provided with a liquid adding port on the upper side of the reaction box, the liquid adding port is connected to the interior of the reaction box, and the water pump outlet pipe at the output end of the water pump is connected to the interior of the recovery box; The bottom of the water pump liquid inlet pipe is fixedly connected to a liquid pumping head guide tube, and a floating liquid pumping head is slidably connected to the liquid pumping head guide tube. The floating liquid pumping head is slidably arranged inside the reaction chamber, and a plurality of buoyancy balls are arranged on the floating liquid pumping head. A guide slide is fixedly arranged on the outer side surface of the liquid pumping head guide tube, and a guide groove is provided inside the floating liquid pumping head to be slidably connected to the guide slide.

[0009] Preferably, a stirring motor is fixedly provided at the bottom of the reaction bin, and the stirring motor is fixedly provided on the reaction box through a motor fixing plate. The output end of the stirring motor is provided with reaction stirring teeth, and the reaction stirring teeth are rotatably provided inside the reaction bin.

[0010] Preferably, a roasting box material taking port is opened on one side of the reaction box, a roasting box is slidably arranged inside the roasting box material taking port, and the port of the roasting box is arranged below the material injection port; A baking box handle is fixedly provided on the outer side of the baking box.

[0011] Preferably, a roasting support plate is fixedly provided on the reaction box at the bottom of the roasting box feeding port, a heating rod assembly is fixedly provided at the bottom of the roasting support plate, and an insulating sealing block is fixedly provided at the bottom of the roasting box, and the insulating sealing block corresponds to the roasting support plate.

[0012] Preferably, a submersible pump is provided inside the liquid storage tank, and the submersible pump is connected to the interior of the reaction chamber through a discharge pipe.

[0013] Preferably, the crushing box is connected to the reaction box via a connecting box, and a heat insulation plate is slidably provided on the connecting box, and the heat insulation plate is used to separate the crushing box and the reaction box.

[0014] Preferably, a feeding port is provided at the upper end of the crushing box, a filter is fixedly provided at the bottom of the crushing box, and a crushing mechanism is rotatably provided above the filter.

[0015] Preferably, the crushing mechanism includes a crushing motor and a crushing shaft, the crushing motor is fixedly arranged on the reaction box, the output end of the crushing motor is provided with a crushing driving wheel, the crushing shaft is fixedly provided with a crushing driven wheel, the crushing driven wheel is meshed with the crushing shaft, the crushing driving wheel is used to rotate the crushing shaft, and the crushing shaft is fixedly provided with cutting crushing teeth.

[0016] The present invention has at least the following beneficial effects: 1. After the circulating mother liquor enters the recovery tank, it reacts after adding lime milk. The reacted liquid enters the separation cylinder through the filter hole. Before the mother liquor enters the separation cylinder, the CaCO3 precipitate generated by the reaction flows into the separation cylinder together with the mother liquor. A filter membrane is provided on the filter hole. The CaCO3 precipitate cannot pass through the filter membrane and is therefore blocked by the filter membrane on the outside of the separation cylinder. Therefore, the filtered mother liquor can enter the separation cylinder and then enter the liquid storage tank. As the CaCO3 precipitate accumulates, it falls into the recovery tank under the action of gravity, which is convenient for unified cleaning later. Since the CaCO3 precipitate will adhere to the surface of the filter membrane, a separation stirring tooth is fixed on the separation cylinder. The separation stirring tooth stirs the water flow to achieve the purpose of removing the CaCO3 precipitate on the filter membrane, avoiding the clogging of the filter membrane by the CaCO3 precipitate, and ensuring the recycling of the mother liquor while recovering NaOH.

[0017] 2. The separation drum is connected to the interior of the roasting bin through the first air duct and the second air duct. As the temperature and air pressure increase during the roasting process, the airflow will enter the interior of the separation drum through the first air duct. After the separation drum drive motor is started, the separation drive gear on the separation drum drive motor drives the separation driven gear to rotate through the transmission gear. The separation driven gear is fixed on the separation drum and is arranged inside the recovery box through the rotation of the separation drum. Therefore, the mother liquor inside the recovery box can be stirred by the separation stirring teeth, thereby improving the filtration efficiency. When the airflow enters the interior of the separation drum through the first air duct, it also enters the interior of the separation drum through the second air duct, thereby achieving the purpose of removing the CaCO3 precipitation.

[0018] 3. The floating liquid extraction head is always in a floating state under the action of the buoyancy ball, so it can only extract the liquid in the upper layer. Under the action of gravity, the floating liquid extraction head moves downward, and the guide slide on the floating liquid extraction head slides on the guide slide on the guide tube of the liquid extraction head. At the same time, the buoyancy ball on the floating liquid extraction head is affected by the buoyancy in the water, so that the floating liquid extraction head is always in a floating state. As the liquid decreases, the floating liquid extraction head will slide downward all the time, so that the upper layer of liquid can be extracted at all times.

[0019] 4. Bauxite and quicklime are crushed inside the crushing box, and after meeting the requirements, they are discharged into the reaction box for reaction. After the reaction is completed, they can be directly roasted. The structure is simple and the processing efficiency is improved. The circulating mother liquor will enter the recovery box for reaction, and lime milk will be added to react with the generated sodium carbonate and recover sodium hydroxide. Then, the generated sodium hydroxide is recovered into the liquid storage tank and recycled to improve resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 It is a partial cross-sectional view of the present invention; Figure 2 The local structure of the present invention Figure 1 ; Figure 3 The local structure of the present invention Figure 2 ; Figure 4 It is a structural diagram of the separation mechanism of the present invention; Figure 5 A partial cross-sectional view of the separation mechanism of the present invention; Figure 6 This is a structural diagram of the floating liquid extraction head of the present invention; Figure 7A cross-sectional view of the floating liquid extraction head of the present invention; Figure 8 The present invention is a three-dimensional Figure 1 ; Figure 9 The present invention is a three-dimensional Figure 2 ; Figure 10 It is a three-dimensional diagram of a baking box of the present invention.

[0021] In the figure, 1. crushing box; 101. feeding port; 102. filter screen; 103. connection box; 104. heat insulation board; 2. reaction box; 201. partition plate; 202. reaction chamber; 203. roasting chamber; 204. roasting support plate; 205. heating rod assembly; 206. roasting box feeding port; 207. injection port; 208. liquid adding port; 3. recovery box; 4. liquid storage tank; 401. submersible pump; 402. liquid discharge pipe; 5. crushing mechanism; 501. crushing motor; 502. crushing drive wheel; 503. crushing driven wheel; 504. crushing shaft; 505. cutting and crushing teeth; 6. water pump; 601. water pump liquid inlet pipe; 602. water pump liquid outlet pipe; 603, liquid extraction head guide tube; 604, floating liquid extraction head; 605, buoyancy ball; 606, guide slide; 607, guide chute; 7, separation mechanism; 701, separation cylinder drive motor; 702, separation cylinder; 703, separation drive gear; 704, transmission gear; 705, separation driven gear; 706, separation stirring tooth; 707, filter membrane; 708, filter hole; 7091, first air guide tube; 7092, second air guide tube; 710, filtered liquid drain pipe; 711, sealing slide; 8, stirring motor; 801, motor fixing plate; 802, reaction stirring tooth; 9, roasting box; 901, heat insulation sealing block; 902, roasting box handle. DETAILED DESCRIPTION

[0022] The following will describe the implementation methods of the present application in detail with reference to the accompanying drawings and examples, so that the implementation process of how the present application applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0023] like Figures 1-10As shown, the environmentally friendly alumina lime milk processing and impurity removal and recycling device provided in this embodiment includes a crushing box 1, a reaction box 2, a recovery box 3 and a liquid storage tank 4 which are connected in sequence. Bauxite and quicklime are crushed inside the crushing box 1, and after meeting the requirements, they are discharged into the interior of the reaction box 2 for reaction. After the reaction is completed, roasting can be carried out directly. The structure is simple and the processing efficiency is improved. The circulating mother liquor will enter the interior of the recovery box 3 for reaction, lime milk is added to react with the generated sodium carbonate and sodium hydroxide is recovered, and then the generated sodium hydroxide is recovered into the liquid storage tank 4. The interior of the reaction box 2 is formed with a reaction chamber 202 and a roasting chamber 203 through a partition plate 201. The reaction chamber 202 is connected to the roasting chamber 203 through a material injection port 207. A stop valve is fixedly provided inside the material injection port 207. After the raw materials are crushed, they are discharged into the interior of the reaction chamber 202 through the connecting box 103. After the raw materials react with NaOH, they enter the interior of the roasting chamber 203 through the material injection port 207. The stop valve is used to switch on and off, so there is no need to transfer the raw materials, which improves the convenience of use and the processing efficiency. The reaction chamber 202 is connected to the interior of the recovery tank 3 through the water pump 6. During the reaction, NaOH and CO2 generate Na2CO3, and the chemical equation is: 2NaOH+CO 2= Na2CO3+H2O; In order to recycle NaOH, it is necessary to remove the NaCO3 mixed in NaOH, and then add lime milk again. The chemical formula is: Na2CO3+Ca(OH)2=2NaOH+CaCO3↓; Therefore, through the metathesis reaction and CaCO3 precipitation is generated and removed. During the removal process, it is separated by the separation mechanism 7. The internal rotation of the recovery box 3 is provided with a separation mechanism 7. The separation mechanism 7 includes a separation cylinder drive motor 701 and a separation cylinder 702. The separation cylinder drive motor 701 is used to rotate the separation cylinder 702. Three groups of separation stirring teeth 706 are provided on the separation cylinder 702. A plurality of filter holes 708 are opened on the separation cylinder 702 between every two groups of separation stirring teeth 706. The recovery box 3 is connected with the interior of the separation cylinder 702 through the filter holes 708. After the circulating mother liquor enters the interior of the recovery box 3, it reacts after adding lime milk. The reacted liquid enters the interior of the separation cylinder 702 through the filter holes 708. The filter hole 708 is provided with a filter membrane 707. Before the mother liquor enters the interior of the separation cylinder 702, the reaction generated The CaCO3 precipitate flows together with the mother liquor to the interior of the separation cylinder 702. A filter membrane 707 is provided on the filter hole 708. The CaCO3 precipitate cannot pass through the filter membrane 707 and is therefore blocked by the filter membrane 707 on the outside of the separation cylinder 702. Therefore, the filtered mother liquor can enter the interior of the separation cylinder 702 and then enter the interior of the liquid storage tank 4. As the CaCO3 precipitate accumulates, it falls into the interior of the recovery tank 3 under the action of gravity, which is convenient for unified cleaning later. Since the CaCO3 precipitate will adhere to the surface of the filter membrane 707, a separation stirring tooth 706 is fixedly provided on the separation cylinder 702. The separation stirring tooth 706 stirs the water flow to achieve the purpose of removing the CaCO3 precipitate on the filter membrane 707 and prevent the CaCO3 precipitate from clogging the filter membrane 707. In addition, as the CaCO3 precipitation adhesion gradually increases, after the water flow cannot wash away the CaCO3 precipitation, the air flow is blown outward from the interior of the separation cylinder 702 to achieve the purpose of cleaning the CaCO3 precipitation. Specifically, a sealing slide 711 is rotatably provided at one end of the separation cylinder 702. The middle part of the sealing slide 711 is connected to the interior of the roasting bin 203 through the first air duct 7091. The lower part of the first air duct 7091 is connected to the interior of the liquid storage tank 4 through the filtrate drain pipe 710 on the sealing slide 711. The separation cylinder 702 is connected to the interior of the roasting bin 203 through the first air duct 7091 and the second air duct 7092. Due to the increase in temperature and air pressure during the roasting process, the air flow will enter the interior of the separation cylinder 702 through the first air duct 7091. Moreover, the other end of the separation cylinder 702 is fixedly connected to a separation driven gear 705, and the separation driven gear 705 is used to rotate the separation cylinder 702. The output end of the separation cylinder drive motor 701 is provided with a separation drive gear 703, and one side of the separation drive gear 703 is rotatably provided with a transmission gear 704. The separation drive gear 703 is meshed with the transmission gear 704, and the separation drive gear 703 is used to rotate the transmission gear 704. The transmission gear 704 is meshed with the separation driven gear 705, and the transmission gear 704 is used to rotate the separation driven gear 705, thereby driving the separation cylinder 702 to rotate. After the separation cylinder drive motor 701 is started, the separation drive gear 703 on the separation cylinder drive motor 701 is driven by the transmission gear The wheel 704 drives the separation driven gear 705 to rotate. The separation driven gear 705 is fixed on the separation cylinder 702 and is arranged inside the recovery box 3 through the rotation of the separation cylinder 702. Therefore, the mother liquor inside the recovery box 3 can be stirred by the separation stirring teeth 706 to improve the filtration efficiency. The middle part of the separation driven gear 705 is rotated and a second air guide pipe 7092 is arranged. The second air guide pipe 7092 is connected to the interior of the roasting bin 203. When the air flow enters the interior of the separation cylinder 702 through the first air guide pipe 7091, it also enters the interior of the separation cylinder 702 through the second air guide pipe 7092, thereby achieving the purpose of removing CaCO3 precipitation on the filter membrane 707, and ensuring the recycling of the mother liquor while recovering NaOH.

[0024] Further, such as Figure 1 、 Figure 3 、 Figure 6 as well as Figure 7 As shown, the input end of the water pump 6 is connected to a water pump inlet pipe 601, which is connected to the reaction chamber 202 inside the reaction box 2. The mother liquor after the reaction is extracted from the liquid inside the reaction chamber 202 through the water pump inlet pipe 601 on the water pump 6. The water pump outlet pipe 602 at the output end of the water pump 6 is connected to the interior of the recovery box 3 and is discharged to the interior of the recovery box 3 through the water pump outlet pipe 602. A liquid adding port 208 is fixedly provided on one side of the water pump inlet pipe 601 on the upper side of the reaction box 2. The liquid adding port 208 is connected to the interior of the reaction box 2, and the liquid adding port 208 is connected to the interior of the reaction chamber 202, and lime milk or solvent water is added through the liquid adding port 208; After the reaction is completed, it is allowed to stand for a period of time. When the upper liquid is extracted, it is convenient to recover the mother liquid. The bottom of the water pump inlet pipe 601 is fixedly connected to the liquid extraction head guide pipe 603, and the liquid extraction head guide pipe 603 is slidably connected to the floating liquid extraction head 604. The floating liquid extraction head 604 is slidably arranged inside the reaction chamber 202. A number of buoyancy balls 605 are provided on the floating liquid extraction head 604. The outer side surface of the liquid extraction head guide pipe 603 is fixedly provided with a guide slide 606. The interior of the floating liquid extraction head 604 is provided with a guide slide 607 that is slidably connected to the guide slide 606. During the extraction process, In order to extract only the upper layer of liquid, the floating liquid extraction head 604 is always in a floating state under the action of the buoyancy ball 605, so it can only extract the liquid in the upper layer. Under the action of gravity, the floating liquid extraction head 604 moves downward, and the guide chute 607 on the floating liquid extraction head 604 slides on the guide slide 606 on the liquid extraction head guide tube 603. At the same time, the buoyancy ball 605 on the floating liquid extraction head 604 is subjected to the buoyancy in the water, so that the floating liquid extraction head 604 is always in a floating state. As the liquid decreases, the floating liquid extraction head 604 will slide downward continuously, so as to always extract the upper layer of liquid. During the reaction, Figure 1 and Figure 3 As shown, in order to speed up the reaction, a stirring motor 8 is fixedly provided at the bottom of the reaction chamber 202. The stirring motor 8 is fixedly provided on the reaction box 2 through a motor fixing plate 801. The output end of the stirring motor 8 is provided with a reaction stirring tooth 802. The reaction stirring tooth 802 is rotatably provided inside the reaction chamber 202. The stirring motor 8 is fixedly provided at the bottom of the reaction chamber 202. After the stirring motor 8 is started, the reacted solution is stirred by the reaction stirring tooth 802, thereby achieving the effect of accelerating the reaction rate.

[0025] Furthermore, Figure 1 、 Figure 8 and Figure 10 As shown, a roasting box material taking port 206 is opened on one side of the reaction box 2, and a roasting box 9 is slidably arranged inside the roasting box material taking port 206. The port of the roasting box 9 is arranged below the material injection port 207. After the reaction is completed, the liquid enters the interior of the roasting box 9 through the material injection port 207. A roasting box handle 902 is fixedly provided on the outer side of the roasting box 9, and the roasting box 9 is taken out by the roasting box handle 902 on the roasting box 9; A roasting support plate 204 is fixedly provided on the reaction box 2 at the bottom of the roasting box material taking port 206, a heating rod assembly 205 is fixedly provided at the bottom of the roasting support plate 204, a heat-insulating sealing block 901 is fixedly provided at the bottom of the roasting box 9, the heat-insulating sealing block 901 corresponds to the roasting support plate 204, a roasting support plate 204 is fixedly provided at the bottom of the roasting box material taking port 206, a plurality of heating rod assemblies 205 are provided at the bottom of the roasting support plate 204, and the roasting box 9 can be quickly heated by starting the heating rod assembly 205 to achieve the purpose of roasting and produce Al2O3. The dehydration process of Al(OH)3 is carried out in three stages; Surface water removal (<200℃): Physically adsorbed water evaporates without chemical reaction; Removal of crystal water (200-400℃): Al(OH)3 decomposes into mesophase boehmite (γ-AlOOH) and water vapor: Al(OH)3 γ-AlOOH+H2O↑; Complete dehydration transformation (>950℃): Boehmite further dehydrates and restructures to form α-Al2O3 (corundum structure): 2γ-AlOOH α-Al2O3+H2O↑; The overall reaction formula is: 2Al(OH)3 Al2O3+3H2O↑; like Figure 2 and Figure 3 As shown, a submersible pump 401 is provided inside the liquid storage tank 4, and the submersible pump 401 is connected to the interior of the reaction chamber 202 through a discharge pipe 402. The submersible pump 401 inside the liquid storage tank 4 draws the mother liquid inside the liquid storage tank 4 and passes it into the interior of the reaction tank 2, so that the mother liquid is recycled and the utilization rate of resources is improved.

[0026] Further, if Figure 1 、 Figure 2 as well as Figure 3 As shown, the crushing box 1 is connected to the reaction box 2 through the connecting box 103. A heat insulation board 104 is slidably provided on the connecting box 103. The heat insulation board 104 is used to separate the crushing box 1 and the reaction box 2. When the bauxite is crushed, the heat insulation board 104 is used to prevent water vapor from entering the crushing box 1. After the crushing is completed, the heat insulation board 104 is pulled open to facilitate the direct discharge of the crushed bauxite into the reaction box 2. The structure is simple and the processing efficiency is improved. During the crushing process, a feeding port 101 is provided at the upper end of the crushing box 1, and raw materials are fed into the crushing box 1 through the feeding port 101. A filter screen 102 is fixedly provided at the bottom of the crushing box 1, and a crushing mechanism 5 is rotatably provided above the filter screen 102, and the raw materials are filtered through the filter screen 102. In addition, the crushing mechanism 5 includes a crushing motor 501 and a crushing shaft 504. The crushing motor 501 is fixedly arranged on the reaction box 2. The output end of the crushing motor 501 is provided with a crushing driving wheel 502. The crushing shaft 504 is fixedly provided with a crushing driven wheel 503. The crushing driven wheel 503 is meshed and connected with the crushing driving wheel 502. The crushing driving wheel 502 is used to rotate the crushing shaft 504. The crushing shaft 504 is fixedly provided with cutting crushing teeth 505. The crushing motor 501 is started by the crushing mechanism 5 to drive the crushing driving wheel 502 to rotate. When the crushing driving wheel 502 rotates, the crushing shaft 504 is also driven to rotate. At the same time, the cutting crushing teeth 505 on the crushing shaft 504 are driven to stir the raw materials. The structure is simple and the processing efficiency is improved.

[0027] like Figures 1-10 As shown, the principle of the environmentally friendly alumina lime milk processing impurity removal and recycling device provided in this embodiment is as follows: After the circulating mother liquor enters the interior of the recovery tank 3, it reacts after adding lime milk, and the reacted liquid enters the interior of the separation cylinder 702 through the filter hole 708. The filter hole 708 is provided with a filter membrane 707. Before the mother liquor enters the interior of the separation cylinder 702, the CaCO3 precipitate generated by the reaction flows into the interior of the separation cylinder 702 together with the mother liquor. The filter hole 708 is provided with a filter membrane 707. The CaCO3 precipitate cannot pass through the filter membrane 707 and is therefore blocked by the filter membrane 707 on the outside of the separation cylinder 702. The filtered mother liquor can enter the interior of the separation cylinder 702 and then enter the interior of the liquid storage tank 4. As the CaCO3 precipitates gradually increase, they fall into the interior of the recovery tank 3 under the action of gravity, which is convenient for unified cleaning later. Since the CaCO3 precipitates will adhere to the surface of the filter membrane 707, separation stirring teeth 706 are fixedly provided on the separation cylinder 702. The separation stirring teeth 706 stir the water flow to achieve the purpose of removing the CaCO3 precipitates on the filter membrane 707 and prevent the CaCO3 precipitates from clogging the filter membrane 707. After the separation drum drive motor 701 is started, the separation drive gear 703 on the separation drum drive motor 701 drives the separation driven gear 705 to rotate through the transmission gear 704. The separation driven gear 705 is fixed to the separation drum 702 and is arranged inside the recovery box 3 through the rotation of the separation drum 702. Therefore, the mother liquid inside the recovery box 3 can be stirred by the separation stirring teeth 706, thereby improving the filtration efficiency. In addition, as the amount of CaCO3 precipitates attached gradually increases, after the water flow cannot wash away the CaCO3 precipitates, the air flow is blown outward from the inside of the separation cylinder 702 to achieve the purpose of cleaning the CaCO3 precipitates. The separation cylinder 702 is connected to the inside of the roasting bin 203 through the first air duct 7091 and the second air duct 7092. As the temperature increases and the air pressure increases during the roasting process, the air flow will enter the interior of the separation cylinder 702 through the first air duct 7091. While the air flow enters the interior of the separation cylinder 702 through the first air duct 7091, it also enters the interior of the separation cylinder 702 through the second air duct 7092, thereby achieving the purpose of clearing the CaCO3 precipitates on the filter membrane 707, and ensuring the recycling of the mother liquor while recovering NaOH.

[0028] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0029] It should be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0030] The foregoing description shows and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the inventive concept described herein by the teachings above or by techniques or knowledge in the relevant art. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be within the scope of the appended claims.

Claims

1. An environmentally friendly device for removing impurities and recycling lime milk for processing alumina, comprising a crushing box (1), a reaction box (2), a recovery box (3) and a liquid storage box (4) connected in sequence, characterized in that: The interior of the reaction box (2) is formed with a reaction chamber (202) and a roasting chamber (203) via a partition plate (201); the reaction chamber (202) is connected to the roasting chamber (203) via a material injection port (207); a stop valve is fixedly provided inside the material injection port (207); The reaction chamber (202) is connected to the interior of the recovery box (3) through a water pump (6). A separation mechanism (7) is provided inside the recovery box (3). The separation mechanism (7) comprises a separation cylinder drive motor (701) and a separation cylinder (702). The separation cylinder drive motor (701) is used to rotate the separation cylinder (702). Three groups of separation stirring teeth (706) are provided on the separation cylinder (702). A plurality of filter holes (708) are provided between every two groups of separation stirring teeth (706). The recovery box (3) is connected to the interior of the separation cylinder (702) through the filter hole (708), a filter membrane (707) is provided on the filter hole (708), a sealing slide (711) is rotatably provided at one end of the separation cylinder (702), the middle of the sealing slide (711) is connected to the interior of the roasting bin (203) through a first air guide pipe (7091), and the lower part of the first air guide pipe (7091) is connected to the interior of the liquid storage tank (4) on the sealing slide (711) through a filtered liquid drain pipe (710); The other end of the separation cylinder (702) is fixedly connected to a separation driven gear (705), and the separation driven gear (705) is used to rotate the separation cylinder (702). A second air guide pipe (7092) is rotatably provided in the middle of the separation driven gear (705), and the second air guide pipe (7092) is connected to the interior of the roasting bin (203).

2. The environmentally friendly impurity removal and recycling device for lime milk processing for alumina according to claim 1, characterized in that: The output end of the separation cylinder driving motor (701) is provided with a separation driving gear (703), and a transmission gear (704) is rotatably provided on one side of the separation driving gear (703). The separation driving gear (703) is meshedly connected with the transmission gear (704), and the separation driving gear (703) is used to rotate the transmission gear (704). The transmission gear (704) is meshedly connected with the separation driven gear (705), and the transmission gear (704) is used to rotate the separation driven gear (705), thereby driving the separation cylinder (702) to rotate.

3. The environmentally friendly impurity removal and recycling device for lime milk processing for alumina according to claim 1, characterized in that: The input end of the water pump (6) is connected to a water pump liquid inlet pipe (601), the water pump liquid inlet pipe (601) is connected to the reaction chamber (202) inside the reaction box (2), one side of the water pump liquid inlet pipe (601) is fixedly provided with a liquid adding port (208) on the upper side of the reaction box (2), the liquid adding port (208) is connected to the interior of the reaction box (2), and the water pump liquid outlet pipe (602) at the output end of the water pump (6) is connected to the interior of the recovery box (3); The bottom of the water pump liquid inlet pipe (601) is fixedly connected to a liquid extraction head guide tube (603), and a floating liquid extraction head (604) is slidably connected to the liquid extraction head guide tube (603). The floating liquid extraction head (604) is slidably arranged inside the reaction chamber (202), and a plurality of buoyancy balls (605) are arranged on the floating liquid extraction head (604). A guide slide (606) is fixedly arranged on the outer side surface of the liquid extraction head guide tube (603), and a guide groove (607) slidably connected to the guide slide (606) is opened inside the floating liquid extraction head (604).

4. The environmentally friendly impurity removal and recycling device for lime milk processing for alumina according to claim 1, characterized in that: A stirring motor (8) is fixedly provided at the bottom of the reaction chamber (202), and the stirring motor (8) is fixedly provided on the reaction box (2) via a motor fixing plate (801). A reaction stirring tooth (802) is provided at the output end of the stirring motor (8), and the reaction stirring tooth (802) is rotatably provided inside the reaction chamber (202).

5. The environmentally friendly impurity removal and recycling device for lime milk processing for alumina according to claim 1, characterized in that: A calcination box material taking port (206) is provided on one side of the reaction box (2), a calcination box (9) is slidably provided inside the calcination box material taking port (206), and the port of the calcination box (9) is provided below the material injection port (207); A baking box handle (902) is fixedly provided on the outer side of the baking box (9).

6. The environmentally friendly impurity removal and recycling device for lime milk processing for alumina according to claim 5, characterized in that: A baking support plate (204) is fixedly provided on the reaction box (2) at the bottom of the baking box material outlet (206), a heating rod assembly (205) is fixedly provided on the bottom of the baking support plate (204), and a heat-insulating sealing block (901) is fixedly provided on the bottom of the baking box (9), and the heat-insulating sealing block (901) corresponds to the baking support plate (204).

7. The environmentally friendly impurity removal and recycling device for lime milk processing for alumina according to claim 1, characterized in that: A submersible pump (401) is provided inside the liquid storage tank (4), and the submersible pump (401) is connected to the interior of the reaction chamber (202) via a liquid discharge pipe (402).

8. The environmentally friendly impurity removal and recycling device for lime milk processing for alumina according to claim 1, characterized in that: The crushing box (1) is connected to the reaction box (2) via a connecting box (103). A heat insulation board (104) is slidably provided on the connecting box (103). The heat insulation board (104) is used to separate the crushing box (1) and the reaction box (2).

9. The environmentally friendly impurity removal and recycling device for lime milk processing for alumina according to claim 1, characterized in that: The upper end of the crushing box (1) is provided with a feeding port (101), a filter screen (102) is fixedly provided at the bottom of the crushing box (1), and a crushing mechanism (5) is rotatably provided above the filter screen (102).

10. The environmentally friendly impurity removal and recycling device for lime milk processing for alumina according to claim 9, characterized in that: The pulverizing mechanism (5) comprises a pulverizing motor (501) and a pulverizing shaft (504); the pulverizing motor (501) is fixedly arranged on the reaction box (2); a pulverizing driving wheel (502) is provided at the output end of the pulverizing motor (501); a pulverizing driven wheel (503) is fixedly provided on the pulverizing shaft (504); the pulverizing driven wheel (503) is meshedly connected with the pulverizing driving wheel (502); the pulverizing driving wheel (502) is used to rotate the pulverizing shaft (504); and cutting pulverizing teeth (505) are fixedly provided on the pulverizing shaft (504).

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