Method for removing aluminum from rare earth leachate

Abstract

The invention provides a method for removing aluminum from rare earth leaching liquid, and relates to the technical field of metal extraction technologies. A method for removing aluminum from rare earth leachate comprises the following steps that S1, styrene and divinylbenzene are mixed, then a pore-foaming agent is added, and an organic phase is obtained after stirring; s2, dissolving polyvinyl alcohol in deionized water, and stirring until the polyvinyl alcohol is completely dissolved to obtain a water phase; s3, slowly adding the organic phase into the water phase, stirring to form a stable suspension, and transferring the stable suspension to a reaction kettle; s4, introducing nitrogen into the reaction kettle, heating, and polymerizing to obtain resin white balls; and S5, mixing the resin white balls with chloromethyl ether. The D290 resin is matched with the 5-sulfosalicylic acid for use, so that the separation difficulty of the complex is reduced. According to the novel technology, efficient aluminum removal can be achieved under the mild condition, rare earth loss is reduced, and the technology is environmentally friendly; through complexing condition optimization, adsorption process design and gradient regeneration technology, directional removal of aluminum ions and cyclic utilization of resin are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal extraction, and particularly relates to a method for removing aluminum from a rare earth leaching solution. BACKGROUND

[0002] In the process of developing rare earth resources, the leaching solution often contains impurities such as aluminum ions. The presence of aluminum ions will interfere with the extraction and separation of rare earths, reduce the extraction efficiency, and even cause problems such as emulsification of the extractant.

[0003] Traditional aluminum removal methods such as oxalate precipitation and alkali neutralization have defects such as high loss rate of rare earths, high cost, and secondary pollution. For example, although naphthenic acid extraction can remove aluminum, it needs to be operated under strong acidic conditions, and the organic phase is easy to lose, resulting in a sharp increase in operating costs.

[0004] In recent years, resin adsorption method has been concerned due to its simple operation, but conventional anion resins have poor selectivity for aluminum ions, and are easy to preferentially adsorb rare earth ions in rare earth-containing solutions, causing loss of rare earths. Although 5-sulfosalicylic acid can form a complex with aluminum ions, it has the problem of difficult separation of the complex when used alone.

[0005] Therefore, it is necessary to provide a method for removing aluminum from a rare earth leaching solution to solve the above technical problems. SUMMARY

[0006] The present application provides a method for removing aluminum from a rare earth leaching solution, which solves the problem of difficult separation of the complex when 5-sulfosalicylic acid is used alone in the related art.

[0007] To solve the above technical problems, the method for removing aluminum from a rare earth leaching solution provided by the present application comprises the following steps:

[0008] Step S1, mixing styrene and divinylbenzene, then adding a pore former, and stirring to obtain an organic phase;

[0009] Step S2, dissolving polyvinyl alcohol in deionized water, and stirring until completely dissolved to obtain an aqueous phase;

[0010] Step S3, slowly adding the organic phase to the aqueous phase to form a stable suspension, and transferring to a reaction kettle;

[0011] Step S4, introducing nitrogen into the reaction kettle and heating, and then polymerizing to obtain a resin white ball;

[0012] Step S5, mixing the resin white ball with chloromethyl ether, filtering and washing to obtain a chloromethylated resin;

[0013] Step S6, mixing the chloromethylated resin with a 20% trimethylamine aqueous solution, and then amine reaction to obtain a target resin;

[0014] Step S7: After washing the target resin, vacuum dry it and sieve to obtain D290 resin;

[0015] Step S8: Add 5-sulfosalicylic acid to the rare earth leaching solution, stir the mixture in a constant temperature water bath to obtain a reaction solution;

[0016] Step S9: Add NaOH solution dropwise to the reaction solution, adjust the pH of the reaction solution, and let it stand to obtain the adsorption solution;

[0017] Step S10: Pack D290 resin into the adsorption column and pass the adsorption solution through to carry out the adsorption reaction; after the adsorption is completed, elute the D290 resin with HCl solution; add lime milk to the eluent to adjust the pH, filter, rinse the D290 resin, and then complete the regeneration.

[0018] Preferably, in step S1, the mass ratio of styrene to divinylbenzene is 8:2, the volume of the pore-forming agent accounts for 30% of the total monomer volume, and the stirring time is 30 min.

[0019] Preferably, in step S2, the ratio of polyvinyl alcohol to deionized water is 1:50, and the stirring temperature is 60°C.

[0020] Preferably, in step S3, the stirring rate is 2000 rpm and the stirring time is 1 hour.

[0021] Preferably, the temperature for heating in step S4 is 85°C and the polymerization time is 8 hours.

[0022] Preferably, in step S5, the mass ratio of resin white balls to chloromethyl ether is 1:5, the reaction temperature is 60℃, and the reaction time is 12h.

[0023] Preferably, in step S6, the volume ratio of chloromethylated resin to 20% trimethylamine aqueous solution is 1:3, the reaction temperature is 50°C, and the reaction time is 8 hours.

[0024] Preferably, in step S7, the target resin is washed with deionized water until neutral, and the vacuum drying temperature is 60°C for 12 hours; the sieved particle size is 0.3-0.5 mm.

[0025] Preferably, in step S8, 5-sulfosalicylic acid reacts with Al in the leachate. 3+ The molar ratio is 1.5:1, the stirring temperature of the stirring reaction is 50℃, and the stirring time is 60min.

[0026] Preferably, in step S9, the concentration of the NaOH solution is 10%, the pH is adjusted to 3.5, and the standing time is 30 minutes.

[0027] Compared with related technologies, the method for removing aluminum from rare earth leachate provided by the present invention has the following beneficial effects:

[0028] By using D290 resin in conjunction with 5-sulfosalicylic acid, the difficulty of complex separation is reduced. This invention's novel process achieves efficient aluminum removal under mild conditions, reduces rare earth loss, and is environmentally friendly. Through optimized complexation conditions, adsorption process design, and gradient regeneration technology, targeted removal of aluminum ions and resin recycling are achieved. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 A three-dimensional view of the first embodiment of the washing and filtration device provided by the present invention;

[0031] Figure 2 for Figure 1 A three-dimensional view of a partial cross-section of the cylinder shown;

[0032] Figure 3 for Figure 1 The diagram shows the structure of the AA cross section;

[0033] Figure 4 for Figure 1 The diagram shows a structural schematic of the BB cross-section.

[0034] Figure 5 for Figure 4 The right view of the first gear connection structure shown;

[0035] Figure 6 A three-dimensional view of a second embodiment of the washing and filtering device provided by the present invention;

[0036] Figure 7 for Figure 6 A three-dimensional diagram of the second drive component connection structure is shown.

[0037] Figure 8 for Figure 6 The diagram shows a cross-sectional view of the blower device.

[0038] Figure 9 for Figure 6 The diagram shows a cross-sectional view of the air blower connection structure.

[0039] Explanation of icon numbers:

[0040] 1. Support mechanism; 11. Bracket; 12. Telescopic component; 111. Auxiliary bracket;

[0041] 2. Cylinder body; 21. Feed pipe; 22. Discharge pipe; 201. Filter cover;

[0042] 3. Drive mechanism; 31. First drive component; 32. Gear pump; 321. Inlet pipe; 322. Outlet pipe; 33. Spray pipe; 34. First gear; 35. Second gear; 36. Missing gear;

[0043] 4. Screw conveyor;

[0044] 5. Drainage cover;

[0045] 6. Feeding mechanism; 61. Second drive component; 62. Conveyor wheel component;

[0046] 7. Drying mechanism; 71. Blowing device; 711. Housing; 712. Fan; 713. Heater; 714. Filter screen; 72. Blowing pipe.

[0047] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0049] This invention provides a method for removing aluminum from rare earth leachate.

[0050] The method for removing aluminum from rare earth leachate includes the following steps:

[0051] Step S1: Styrene and divinylbenzene are mixed, a porogen is added, and the mixture is stirred to obtain an organic phase;

[0052] Step S2: Polyvinyl alcohol is dissolved in deionized water and stirred until completely dissolved to obtain an aqueous phase;

[0053] Step S3: Slowly add the organic phase to the aqueous phase, stir to form a stable suspension, and transfer it to the reaction vessel;

[0054] Step S4: Nitrogen gas is introduced into the reactor and the temperature is increased. After polymerization, resin white spheres are obtained.

[0055] Step S5: Mix the resin white balls with chloromethyl ether, filter and wash to obtain chloromethylated resin;

[0056] Step S6: Mix the chloromethylated resin with a 20% trimethylamine aqueous solution, and obtain the target resin after the amination reaction;

[0057] Step S7: After washing the target resin, vacuum dry it and sieve to obtain D290 resin;

[0058] Step S8: Add 5-sulfosalicylic acid to the rare earth leaching solution, stir the mixture in a constant temperature water bath to obtain a reaction solution;

[0059] Step S9: Add NaOH solution dropwise to the reaction solution, adjust the pH of the reaction solution, and let it stand to obtain the adsorption solution;

[0060] Step S10: Pack D290 resin into the adsorption column and pass the adsorption solution through to carry out the adsorption reaction; after the adsorption is completed, elute the D290 resin with HCl solution; add lime milk to the eluent to adjust the pH, filter, rinse the D290 resin, and then complete the regeneration.

[0061] Specifically, in step S1, the mass ratio of styrene to divinylbenzene is 8:2, the volume of the pore-forming agent accounts for 30% of the total monomer volume, and the stirring time is 30 minutes.

[0062] Specifically, in step S2, the ratio of polyvinyl alcohol to deionized water is 1:50, and the stirring temperature is 60°C.

[0063] Specifically, in step S3, the stirring rate is 2000 rpm and the stirring time is 1 hour.

[0064] Specifically, in step S4, the heating temperature is 85°C and the polymerization time is 8 hours.

[0065] Specifically, in step S5, the mass ratio of resin white balls to chloromethyl ether is 1:5, the reaction temperature is 60℃, and the reaction time is 12h.

[0066] Specifically, in step S6, the volume ratio of chloromethylated resin to 20% trimethylamine aqueous solution is 1:3, the reaction temperature is 50℃, and the reaction time is 8h.

[0067] Specifically, in step S7, the target resin is washed with deionized water until neutral, and the vacuum drying temperature is 60°C for 12 hours; the sieved particle size is 0.3-0.5 mm.

[0068] Specifically, in step S8, 5-sulfosalicylic acid reacts with Al in the leachate. 3+ The molar ratio is 1.5:1, the stirring temperature of the stirring reaction is 50℃, and the stirring time is 60min.

[0069] Specifically, in step S9, the concentration of the NaOH solution is 10%, the pH is adjusted to 3.5, and the standing time is 30 minutes.

[0070] Specifically, in step S10, the D290 resin packing density is 0.6 g / cm³, the bed height is 40 cm, the adsorption solution flow rate is 0.2 mL / min, and the reaction time is 120 min.

[0071] Specifically, the concentration of the HCl solution is 0.1 mol / L, and the flow rate is 1 BV / h.

[0072] Specifically, the pH of the eluent is adjusted to 11; during rinsing, deionized water is used to rinse the D290 resin to pH 7.

[0073] Beneficial effects:

[0074] By using D290 resin in conjunction with 5-sulfosalicylic acid, the difficulty of complex separation is reduced. This invention's novel process achieves efficient aluminum removal under mild conditions (pH 3-4), reducing rare earth loss and being environmentally friendly. Through optimized complexation conditions, adsorption process design, and gradient regeneration technology, targeted removal of aluminum ions and resin recycling are achieved.

[0075] Option 1:

[0076] Weigh 80g of styrene and 20g of divinylbenzene, add 30mL of liquid paraffin and 30mL of toluene as a porogen, and stir at 30℃ for 30min to obtain an organic phase;

[0077] Dissolve 10g of polyvinyl alcohol in 500mL of deionized water and stir at 60℃ for 1h to obtain the aqueous phase;

[0078] The organic phase was slowly added to the aqueous phase under stirring at 2000 rpm, and after stirring for 1 hour, the mixture was transferred to a 1 L reactor. Nitrogen gas was introduced for 30 minutes, the temperature was raised to 85°C, and polymerization was carried out for 8 hours. After cooling, the mixture was filtered to obtain white resin spheres. The white resin spheres were mixed with 200 mL of chloromethyl ether (dissolved in 400 mL of dichloroethane) and reacted at 60°C for 12 hours. After filtration and washing, chloromethylated resin was obtained. The chloromethylated resin was mixed with 300 mL of 20% trimethylamine aqueous solution and amination was carried out at 50°C for 8 hours. After washing with deionized water until neutral, the mixture was dried at 60°C for 12 hours and sieved to obtain 0.3-0.5 mm resin (D290 resin).

[0079] Take 1 L of leachate and add 0.0085 mol of 5-sulfosalicylic acid (to Al). 3+The mixture was stirred in a water bath at 50°C for 60 min (molar ratio 1.5:1). The pH was adjusted to 3.5 by adding 10% NaOH solution, and the mixture was allowed to stand for 30 min. D290 resin was packed into a Φ20mm×500mm glass column (packing density 0.6 g / cm³, bed height 40 cm), with a 2 cm layer of quartz sand at the bottom. The solution was passed through at a flow rate of 0.2 mL / min, and samples were taken every 30 min to detect Al. 3+ Concentration. When the effluent Al 3+ Adsorption was stopped when the concentration was >10 mg / L twice consecutively. The resin was eluted with 0.1 mol / L HCl solution at a flow rate of 1 BV / h in the reverse direction, and the eluent was collected. Lime slurry was added to the eluent to adjust the pH to 11, and the mixture was stirred for 30 min. The precipitate of Al(OH)3 was obtained by filtration, and the fluoride concentration in the filtrate was <10 mg / L. The resin was then regenerated by forward rinsing with deionized water to bring the pH to 7.

[0080] Because rare earth leachate is not only a liquid but also contains a mixture of many impurities, it is classified as solid waste in waste classification.

[0081] By extracting aluminum resources from rare earth leachate, aluminum resources can be recycled, making it easier to extract aluminum ions (non-ferrous metals) from waste rare earth leachate, and ultimately extracting aluminum resources from solid waste to facilitate the recycling of metal materials.

[0082] The present invention also provides a washing and filtration device for washing and filtering the mixture (resin white balls and chloromethyl ether after mixing and reacting) in the method for removing aluminum from rare earth leachate.

[0083] First embodiment:

[0084] Please refer to the following: Figures 1 to 4 In this invention, the washing and filtering device includes:

[0085] Supporting structure 1;

[0086] The cylinder 2 is mounted on the support mechanism 1. A feed pipe 21 is provided at the top of one end of the cylinder 2, and a discharge pipe 22 is provided at the bottom of the other end of the cylinder 2. A filter cover 201 is integrated and installed at the bottom of one end of the cylinder 2.

[0087] The drive mechanism 3 includes a first drive member 31, a gear pump 32, a spray pipe 33, a first gear 34, and a second gear 35. The first drive member 31 is fixedly mounted on the cylinder 2. The drive shaft of the gear pump 32 is fixedly connected to the drive shaft of the first drive member 31. The gear pump 32 is fixedly mounted on the cylinder 2. The input end of the gear pump 32 is connected to an inlet pipe 321, and the output end of the gear pump 32 is connected to an outlet pipe 322. The spray pipe 33 is integrated and mounted on the cylinder 2 and communicates with the outlet pipe 322. The first gear 34 is fixedly mounted on the drive part of the first drive member 31, and the second gear 35 is meshed with the first gear 34.

[0088] The spiral conveying rod 4 is rotatably installed inside the cylinder 2, and the shaft end of the spiral conveying rod 4 passes through the cylinder 2 and is fixedly connected to the shaft end of the second gear 35.

[0089] Drainage hood 5 is fixed at the bottom of the cylinder 2 and covers the outside of the filter cover 201.

[0090] like Figure 5 As shown, the input end of the inlet pipe 321 is connected to the liquid supply section of the washing solution;

[0091] The gear pump 32 adopts a gear pumping structure in the prior art, mainly composed of a gear cover and two pumping gears. The two pumping gears are meshed and rotatably installed in the gear cover. The shaft end of any one of the pumping gears passes through the gear cover and is fixed to the shaft end of the first drive member 31.

[0092] When the first driving component 31 controls the pumping gear to rotate, the washing solution is drawn through the inlet pipe 321 and pumped into the outlet pipe 322. The washing solution is then sprayed into the cylinder 2 through the spray pipe 33 for spraying and washing the material inside the cylinder 2.

[0093] In this embodiment, the output end of the drain cover 5 is connected to the washing solution discharge pipeline, which facilitates the drainage and transportation of the filtered washing solution.

[0094] After the mixture enters the interior of the cylinder 2, the first drive member 31 drives the second gear 35 to rotate through the first gear 34. The second gear 35 drives the spiral conveyor rod 4 to rotate. While the spiral conveyor rod 4 rotates, it drives the mixture to be conveyed. At the same time as the mixture is being conveyed, the first drive member 31 also drives the gear pump 32 to run. The gear pump 32 draws washing solution through the inlet pipe 321. The washing solution is delivered to the spray pipe 33 through the outlet pipe 322. The spray pipe 33 sprays the washing solution into the cylinder 2 to spray and wash the mixture during the conveying process.

[0095] During the conveying of the mixed materials, the washing solution is sprayed simultaneously; and after washing, the mixed materials are filtered and separated by the filter cover 201 and then conveyed and discharged through the discharge pipe 22. The washing solution enters the guide hood 5 after passing through the filter cover 201. The guide hood 5 conveys and discharges the washing solution without affecting the continuous spray washing of the mixed materials in the cylinder 2.

[0096] Please refer to the following: Figure 1 and Figure 3 The washing and filtering equipment also includes a feeding mechanism 6, which includes a second driving member 61 and a conveying wheel 62. The conveying wheel 62 is rotatably mounted on the feed pipe 21, and the second driving member 61 is used to drive the conveying wheel 62 to rotate and adjust.

[0097] In this embodiment, the second driving member 61 can be a motor structure. The fixing part of the second driving member 61 is fixedly mounted on the feed pipe 21, and the drive shaft of the second driving member 61 is fixedly connected to the shaft of the conveying wheel 62. This facilitates direct control of the rotation adjustment of the conveying wheel 62.

[0098] like Figure 3 As shown, the conveying wheel 62 has at least four feeding slots to facilitate the receiving and conveying of the mixed materials. When the feeding slots are at the bottom, it is convenient to put the mixed materials into the cylinder 2.

[0099] When feeding is required, the second drive unit 61 is activated, which drives the conveyor wheel 62 to rotate 90° once. After the conveyor wheel 62 rotates, the mixture is fed once, which makes it convenient to control the conveyor wheel 62 to feed the mixture intermittently through the second drive unit 61.

[0100] Please refer to the following: Figure 1 and Figure 2The support mechanism 1 includes a bracket 11 and a telescopic member 12. One end of the cylinder 2 is hinged to the top of the bracket 11, and the two ends of the telescopic member 12 are respectively hinged to the other end of the bracket 11 and the cylinder 2.

[0101] In this embodiment, the telescopic component 12 is a hydraulic telescopic cylinder, used to drive the cylinder 2 to rotate and adjust on the support 11, so as to adjust the tilt angle of the cylinder 2 during operation.

[0102] The cylinder 2 is rotatably mounted on the bracket 11, which facilitates the adjustment of the tilt angle of the cylinder 2 to enable the tilting and filtration of the mixed materials, while ensuring that the washing solution can stably pass through the filter cover 201 and enter the range of the guide cover 5.

[0103] The working principle of the washing and filtration equipment provided in this embodiment is as follows:

[0104] A1, Equipment pre-operation: Before the mixed materials are added, the first drive unit 31 is started. The first drive unit 31 drives the gear pump 32 to rotate. When the gear pump 32 rotates, the washing solution is input into the spray pipe 33 through the inlet pipe 321 and the outlet pipe 322. The spray pipe 33 sprays the washing solution towards the cylinder 2.

[0105] During the process of spraying the washing solution, the first drive unit 31 also drives the first gear 34 to rotate, the first gear 34 drives the second gear 35 to rotate, the second gear 35 drives the spiral conveying rod 4 to rotate, and the spiral conveying rod 4 is used to convey the mixture in the cylinder 2 towards the discharge pipe 22.

[0106] A2, Feeding of the mixture: The mixture is fed into the top of the conveying wheel 62 through the feed pipe 21. The second drive 61 is activated, and the second drive 61 drives the conveying wheel 62 to rotate once, with a rotation angle of 90°. The conveying wheel 62 drives the mixture downward to be conveyed into the cylinder 2.

[0107] A3, Washing of the mixture: After the mixture enters the interior of the cylinder 2, the screw conveyor 4 conveys the mixture toward the discharge pipe 22;

[0108] During the transport of the mixed materials, the spray pipe 33 sprays a washing solution into the transport range of the mixed materials to wash the mixed materials during the transport process;

[0109] A4, Filtration of the mixture: During the washing process, the mixture and the washing solution are mixed and then separated by the filter cover 201. The washing solution enters the range of the guide cover 5 and is discharged. The mixture is continuously conveyed above the filter cover 201 to facilitate simultaneous washing, filtration and conveying of the mixture.

[0110] Second embodiment:

[0111] Please refer to the following: Figure 6 and Figure 7 Based on the washing and filtration device provided in the first embodiment of the present invention, the second embodiment of the present invention proposes another washing and filtration device. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0112] Specifically, the washing and filtering device provided in the second embodiment of the present invention differs in that the drive mechanism 3 further includes a missing gear 36, which is fixed on the drive shaft of the first drive member 31; the second drive member 61 is a gear structure, and the second drive member 61 is aligned with the meshing range of the missing gear 36.

[0113] In this embodiment, when the second driving member 61 is not engaged with the missing gear 36, the missing gear 36 does not drive the conveying wheel 62 to rotate when it rotates;

[0114] When the second driving member 61 engages with the missing gear 36, the missing gear 36 rotates, driving the conveying wheel 62 to rotate synchronously, with each rotation angle being 90°, so as to complete one feeding cycle.

[0115] While the first driving component 31 drives the gear pump 32 to supply liquid, it can not only drive the spiral conveyor rod 4 to transport and push the mixture, but also control the intermittent feeding of the mixture inside the feed pipe 21 into the cylinder 2; so as to realize the supply of washing solution, the intermittent feeding of mixture, and the continuous washing and conveying of mixture simultaneously under the action of the same driving structure.

[0116] Please refer to the following: Figure 6 , Figure 8 and Figure 9The washing and filtering equipment further includes a drying mechanism 7, which includes a blowing device 71 and a blowing pipe 72. The blowing device 71 includes a housing 711, a fan 712, a heater 713, and a filter screen 714. The housing 711 is fixed on the cylindrical body 2. The filter screen 714, the fan 712, and the heater 713 are sequentially installed inside the housing 711. The filter screen 714 is located in the input direction of the fan 712, and the heater 713 is located in the output direction of the fan 712. The blowing pipe 72 is fixed on the cylindrical body 2. The input end of the blowing pipe 72 is connected to the output end of the housing 711, and the output end of the blowing pipe 72 is connected to the inside of the cylindrical body 2.

[0117] In this embodiment, the fan 712 is used to draw outside air into the housing 711. After being drawn by the fan 712, the air is blown into the interior of the cylinder 2 through the air pipe 72 for drying the mixed materials during the conveying process.

[0118] In this embodiment, the heater 713 is an electric heating wire structure used to heat the air inside the housing 711, and the heated air is used to improve the efficiency of the blower modification.

[0119] In this embodiment, the filter 714 is used to filter the air entering the housing 711, reducing the contact between external impurities and the mixed materials during the air drying process.

[0120] This allows for the sequential completion of intermittent feeding, conveying, washing, and drying of the mixture within the same cylinder 2, facilitating continuous and uninterrupted processing of the mixture.

[0121] Please see Figure 6 The support mechanism 1 further includes an auxiliary bracket 111, the bottom of which is fixed to the bracket 11; when the cylinder 2 is in a horizontal state, the bottom of the cylinder 2 is supported on the top of the auxiliary bracket 111.

[0122] The auxiliary bracket 111 provides auxiliary support for the cylinder 2 in the retracted state, ensuring the stability of the equipment when it is retracted or transported.

[0123] The working principle of the washing and filtration equipment provided in this embodiment:

[0124] B1. During material conveying, the first drive unit 31 is activated, which drives the gear pump 32 to operate. The gear pump 32 draws washing solution through the inlet pipe 321, and the washing solution is conveyed to the spray pipe 33 through the outlet pipe 322. The spray pipe 33 sprays the washing solution onto the mixed material entering the cylinder 2, and washes the mixed material during the conveying process through the washing solution.

[0125] B2, during the spray washing process of the mixed material, the first drive component 31 also drives the first gear 34 to rotate, the first gear 34 drives the second gear 35 to rotate synchronously, the second gear 35 drives the spiral conveyor 4 to rotate, and the spiral conveyor 4 conveys the mixed material entering the cylinder 2 towards the discharge pipe 22, so as to facilitate the continuous conveying of the mixed material entering the cylinder 2.

[0126] B3, during the process of spraying and washing the mixed materials and conveying the materials, the first driving component 31 also drives the missing gear 36 to rotate. During the rotation of the missing gear 36, it first engages with the second driving component 61. After engagement, the missing gear 36 drives the second driving component 61 to rotate, and the second driving component 61 drives the conveying wheel 62 to rotate. After the conveying wheel 62 rotates 90°, the missing gear 36 separates from the second driving component 61, so as to facilitate the intermittent feeding of the mixed materials inside the feed pipe 21 and avoid the accumulation of materials after entering the cylinder 2.

[0127] B4. While the mixture enters the cylinder 2 for spray washing, conveying and intermittent feeding, the mixture first passes through the top of the filter cover 201, and the washing solution directly passes through the filter cover 201 into the diversion cover 5, and is diverted and discharged through the pipeline of the diversion cover 5.

[0128] B5. During the conveying of the mixed materials, the blower 712 is started. The blower 712 draws in outside air into the casing 711. After the air is filtered and impurities are removed by the filter screen 714, it is heated by the heater 713 to form hot air. The hot air is blown into the cylinder 2 through the blower pipe 72 and dries the washed mixed materials. The dried mixed materials are then conveyed downward through the discharge pipe 22.

[0129] This allows the equipment to complete the conveying of the mixed materials, the supply of liquid for spray washing, and the intermittent feeding of the mixed materials under the driving action of the first driving component 31.

[0130] Ultimately, during the process of conveying the mixed material within the cylinder 2, the intermittent feeding, spray washing, filtration, drying, and discharge of the mixed material are completed simultaneously.

[0131] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for removing aluminum from rare earth leachate, characterized in that, Includes the following steps: Step S1: Styrene and divinylbenzene are mixed, a porogen is added, and the mixture is stirred to obtain an organic phase; Step S2: Polyvinyl alcohol is dissolved in deionized water and stirred until completely dissolved to obtain an aqueous phase; Step S3: Slowly add the organic phase to the aqueous phase, stir to form a stable suspension, and transfer it to the reaction vessel; Step S4: Nitrogen gas is introduced into the reactor and the temperature is increased. After polymerization, resin white spheres are obtained. Step S5: Mix the resin white balls with chloromethyl ether, filter and wash to obtain chloromethylated resin; Step S6: Mix the chloromethylated resin with a 20% trimethylamine aqueous solution, and obtain the target resin after the amination reaction; Step S7: After washing the target resin, vacuum dry it and sieve to obtain D290 resin; Step S8: Add 5-sulfosalicylic acid to the rare earth leaching solution, stir the mixture in a constant temperature water bath to obtain a reaction solution; Step S9: Add NaOH solution dropwise to the reaction solution, adjust the pH of the reaction solution, and let it stand to obtain the adsorption solution; Step S10: Pack D290 resin into the adsorption column and pass the adsorption solution through to carry out the adsorption reaction; after the adsorption is completed, elute the D290 resin with HCl solution; add lime milk to the eluent to adjust the pH, filter, rinse the D290 resin, and then complete the regeneration.

2. The method for removing aluminum from rare earth leachate according to claim 1, characterized in that, In step S1, the mass ratio of styrene to divinylbenzene is 8:2, the volume of the pore-forming agent accounts for 30% of the total monomer volume, and the stirring time is 30 minutes.

3. The method for removing aluminum from rare earth leachate according to claim 1, characterized in that, In step S2, the ratio of polyvinyl alcohol to deionized water is 1:50, and the stirring temperature is 60°C.

4. The method for removing aluminum from rare earth leachate according to claim 1, characterized in that, In step S3, the stirring rate is 2000 rpm and the stirring time is 1 hour.

5. The method for removing aluminum from rare earth leachate according to claim 1, characterized in that, In step S4, the temperature is raised to 85°C and the polymerization time is 8 hours.

6. The method for removing aluminum from rare earth leachate according to claim 1, characterized in that, In step S5, the mass ratio of resin white balls to chloromethyl ether is 1:5, the reaction temperature is 60℃, and the reaction time is 12h.

7. The method for removing aluminum from rare earth leachate according to claim 1, characterized in that, In step S6, the volume ratio of chloromethylated resin to 20% trimethylamine aqueous solution is 1:3, the reaction temperature is 50℃, and the reaction time is 8h.

8. The method for removing aluminum from rare earth leachate according to claim 1, characterized in that, In step S7, the target resin is washed with deionized water until neutral, and the vacuum drying temperature is 60℃ for 12 hours; the sieved particle size is 0.3-0.5mm.

9. The method for removing aluminum from rare earth leachate according to claim 1, characterized in that, In step S8, 5-sulfosalicylic acid reacts with Al in the leachate. 3+ The molar ratio is 1.5:1, the stirring temperature of the stirring reaction is 50℃, and the stirring time is 60min.

10. The method for removing aluminum from rare earth leachate according to claim 1, characterized in that, In step S9, the concentration of the NaOH solution is 10%, the pH is adjusted to 3.5, and the standing time is 30 minutes.

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