Method for precipitating rare earth in ionic rare earth mother liquor

Abstract

The invention belongs to the technical field of rare earth ore leaching mother liquor treatment, and particularly relates to a method for precipitating rare earth in ionic rare earth mother liquor, annular air pipes are arranged at the bottom of an experimental pool body, are annular and are uniformly arranged from large to small, and the annular air pipes are communicated through connecting pipes; one or more air pumps are used for supplying air to the annular air pipe, a plurality of aeration openings are uniformly distributed in the top of the annular air pipe, and when liquid in the experimental pool body needs to be aerated, the liquid in the experimental pool body is subjected to multi-point aeration through the plurality of aeration openings, so that the aeration effect is improved, the aeration uniformity is improved, and the aeration efficiency is improved. Therefore, a good liquid mixing effect is effectively provided.

Description

Technical Field

[0001] The invention belongs to the technical field of rare earth ore leaching mother liquor treatment, in particular to a method for precipitating rare earths from ionic rare earth mother liquor. Background Art

[0002] In the current existing technology, the initial treatment method of ionic rare earth mother liquor is currently commonly used ammonium bicarbonate impurity removal precipitation method. The ammonium bicarbonate impurity removal precipitation method is divided into two steps: impurity removal and precipitation. Impurity removal is to use the weak alkalinity of ammonium bicarbonate to increase the pH value of the supernatant to adjust to pH=5.4. At this time, the impurity ions such as aluminum ions and iron ions in the rare earth mother liquor will form precipitation and enrich to the bottom of the pool to form slag heads, and the treated supernatant will flow to the precipitation platform; the precipitation platform is to use the weak alkalinity of ammonium bicarbonate to further increase the pH value of the supernatant to adjust to pH close to 7.0. The rare earth ions in the supernatant are enriched at the bottom of the pool to form carbonate precipitates, which are called carbonate mixed rare earths.

[0003] Ammonium bicarbonate is used to recover rare earths. After the mine is closed, ammonia nitrogen will flow out of the ore body with rainwater to produce ammonia nitrogen wastewater, leading to eutrophication of surrounding water sources, so the sodium bicarbonate impurity removal and precipitation method came into being. After actual application, it was found that the amount of sodium bicarbonate used for impurity removal and precipitation was large, and the cost of raw materials was high, so a new process was needed to reduce the cost. Therefore, a method for precipitating rare earths from ionic rare earth mother liquor was proposed to address the above problems. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background technology, the present invention proposes a method for precipitating rare earth from an ionic rare earth mother solution.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a method for precipitating rare earth from ionic rare earth mother solution according to the present invention comprises the following steps: S1: Prepare 300m³ of rare earth mother liquor and store it in the 1# experimental pool for impurity removal, the pool capacity is 500m³; S2: Add 5% sodium bicarbonate solution and continuously measure the pH value of the mother liquor until the pH reaches 5.4; S3: Then add a polyacrylamide solution with a concentration of 0.7‰, and start the air compressor to aerate the bottom of the pool for 0.5h while adding the sodium bicarbonate solution, and let the 1# experimental pool stand for 3h-4h to make the supernatant in the pool clear and see the bottom; S4: The supernatant is pumped to the 2# experimental pool for sedimentation treatment through a water pump. The pool capacity is 500m³. The bottom slag in the 1# experimental pool is pumped to the filter press to obtain solid slag, which is sent for inspection and burning test; S5: Add 100m³ of 3% light industrial sodium carbonate solution into the 2# experimental pool; at the same time, add 0.7‰ polyacrylamide solution and 0.5kg hexamethylenetetramine solid; S6: When adding sodium carbonate solution, 0.7‰ polyacrylamide solution and 0.5kg hexamethylenetetramine solid, turn on the air compressor to aerate the bottom of the pool for 0.5h. After the end, let it stand for 3h-4h until the supernatant is clear and the bottom is visible; S7: Finally, the carbonate mixed rare earth at the bottom of the pool is pumped to the filter press for filtration to obtain concentrated carbonate rare earth, which is then sent for calcination testing.

[0006] Preferably, the rare earth mother liquor in S1 has a pH of 4.3, a concentration of 0.3 g / L, and a water temperature of 11.7°C.

[0007] Preferably, when the sodium bicarbonate solution is added to S3, a polyacrylamide solution with a concentration of 0.7‰ is added at the same time, for a total of 0.4m³.

[0008] Preferably, the experimental pool proposed in S1 includes an experimental pool body; an annular air pipe is installed on the inner wall of the experimental pool body; a connecting pipe is fixedly connected to the middle of the annular air pipe; a plurality of aeration ports are fixedly connected to the middle of the annular air pipe; the aeration ports are arranged in a circular array; a partition is provided on the top of the aeration port; the partition is fixedly connected to the inner wall of the experimental pool body; a plurality of air holes are opened in the middle of the partition; the positions of the air holes are relatively corresponding to the positions of the aeration ports; and an air pump is installed at the end of the connecting pipe.

[0009] Preferably, a plurality of brackets are provided on the top of the partition; the brackets are fixedly connected to the top of the partition; a connecting rod is fixedly connected to the middle of the bracket; an impeller is sleeved on the side wall of the connecting rod; and a diverter is fixedly connected to the end of the connecting rod.

[0010] Preferably, an anti-corrosion layer is fixedly connected to the top of the partition; a heating pipe is fixedly connected to the top of the partition; a mounting groove is opened on the side wall of the anti-corrosion layer; and an insulation layer is fixedly connected to the inner side wall of the mounting groove.

[0011] Preferably, a dustproof plate is fixedly connected to the inner wall of the air hole; a plurality of through holes are provided in the middle of the dustproof plate; a sealing ball is installed on the top of the aeration port; and a ball groove is provided at the bottom of the dustproof plate.

[0012] Preferably, a plurality of through holes are opened and closed in the middle of the thermal insulation layer; the through holes are symmetrically arranged; and reinforcing ribs are fixedly connected to the inner side walls of the through holes.

[0013] Preferably, the end of the diverter is arc-shaped; the diverter is hemispherical. Beneficial effects of the present invention: The present invention provides a method for precipitating rare earth from ionic rare earth mother liquor, which has the following advantages: First of all, compared with the original carbonate rare earth product, the quality has been improved, the unit consumption of raw materials has been reduced, the cost of raw materials has been reduced, the time for impurity removal and precipitation has been reduced, the impurity removal process saves an average of 20 minutes, and the precipitation process saves an average of 30 minutes.

[0014] The invention provides a method for precipitating rare earths from an ionic rare earth mother liquor. The method comprises the following steps: an annular air pipe is arranged at the bottom of an experimental pool body, and the annular air pipe is annular and evenly arranged from large to small. The annular air pipes are connected through a connecting pipe, and air is supplied to the annular air pipes through one or more air pumps. A plurality of aeration ports are evenly distributed on the top of the annular air pipe. When liquid in the experimental pool body needs to be aerated, the liquid in the experimental pool body is aerated at multiple points through the plurality of aeration ports, so as to improve the aeration effect, improve the uniformity of aeration, and further effectively provide a good mixing effect of the liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0016] In the attached picture: Figure 1 is a flow chart of the method of the present invention; Figure 2 is a stereogram of the present invention; Figure 3 It is a cross-sectional view of the experimental pool body in the present invention; Figure 4 for Figure 3 The enlarged view of point A in the middle; Figure 5 for Figure 3 The enlarged view of point B in the middle; Figure 6 is a stereoscopic view of the annular trachea of ​​the present invention; Figure 7 It is a three-dimensional diagram of the anti-corrosion layer and the thermal insulation cotton in the present invention; Figure 8 is a three-dimensional diagram of an impeller in the present invention; Fig. 9 It is a diagram showing the matching of the sealing ball and the ball groove in the present invention.

[0017] Legend: 1. Experimental pool body; 11. Annular air pipe; 12. Connecting pipe; 13. Aeration port; 14. Air pump; 15. Partition; 16. Air hole; 17. Controller; 2. Bracket; 21. Connecting rod; 22. Impeller; 23. Diverter; 3. Heating tube; 31. Anti-corrosion layer; 32. Insulation layer; 33. Installation groove; 4. Dustproof plate; 41. Sealing ball; 42. Ball groove; 5. Through hole; 51. Reinforcement rib. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Specific examples are given below.

[0020] See also Figure 1-Figure 9 The present invention provides a method for precipitating rare earth from an ionic rare earth mother solution, comprising the following steps: S1: Prepare 300m³ of rare earth mother liquor and store it in the 1# experimental pool for impurity removal, the pool capacity is 500m³; S2: Add 5% sodium bicarbonate solution and continuously measure the pH value of the mother liquor until the pH reaches 5.4; S3: Then add a polyacrylamide solution with a concentration of 0.7‰, and start the air compressor to aerate the bottom of the pool for 0.5h while adding the sodium bicarbonate solution, and let the 1# experimental pool stand for 3h-4h to make the supernatant in the pool clear and see the bottom; S4: The supernatant is pumped to the 2# experimental pool for sedimentation treatment through a water pump. The pool capacity is 500m³. The bottom slag in the 1# experimental pool is pumped to the filter press to obtain solid slag, which is sent for inspection and burning test; S5: Add 100m³ of 3% light industrial sodium carbonate solution into the 2# experimental pool; at the same time, add 0.7‰ polyacrylamide solution and 0.5kg hexamethylenetetramine solid; S6: When adding sodium carbonate solution, 0.7‰ polyacrylamide solution and 0.5kg hexamethylenetetramine solid, turn on the air compressor to aerate the bottom of the pool for 0.5h. After the end, let it stand for 3h-4h until the supernatant is clear and the bottom is visible; S7: Finally, the carbonate mixed rare earth at the bottom of the pool is pumped to the filter press for filtration to obtain concentrated carbonate rare earth, which is then sent for calcination testing.

[0021] Further, such as Figure 1 As shown, the rare earth mother liquor in S1 has a pH of 4.3, a concentration of 0.3 g / L, and a water temperature of 11.7°C.

[0022] Further, such as Figure 1 As shown, when the sodium bicarbonate solution is added to S3, a polyacrylamide solution with a concentration of 0.7‰ is added at the same time, totaling 0.4m³.

[0023] Further, such as Figure 2-Figure 9As shown, the experimental pool proposed in S1 includes an experimental pool body 1; an annular air pipe 11 is installed on the inner wall of the experimental pool body 1; a connecting pipe 12 is fixedly connected to the middle of the annular air pipe 11; a plurality of aeration ports 13 are fixedly connected to the middle of the annular air pipe 11; the aeration ports 13 are arranged in a circular array; a partition 15 is provided on the top of the aeration port 13; the partition 15 is fixedly connected to the inner wall of the experimental pool body 1; a plurality of air holes 16 are opened in the middle of the partition 15; the positions of the air holes 16 are relatively corresponding to the positions of the aeration ports 13; an air pump 14 is installed at the end of the connecting pipe 12. When working, the traditional aeration method is mainly to use an air pump to inject gas into the liquid, so that the liquid inside the experimental pool body 1 surges inside the experimental pool body 1 under the action of the air pump. The effect of contact with air has been achieved, and its aeration point is relatively single, so that the aeration of the liquid inside the experimental pool body 1 is uneven, and the aeration of the liquid inside the experimental pool body 1 is not uniform enough. Through the annular air pipe 11 set at the bottom of the experimental pool body 1, and the annular air pipe 11 is annular, and is evenly arranged from large to small, the annular air pipe 11 is connected through the connecting pipe 12, and the annular air pipe 11 is supplied with air through one or more air pumps 14, and a plurality of aeration ports 13 are evenly distributed on the top of the annular air pipe 11. When it is necessary to aerate the liquid inside the experimental pool body 1, the liquid inside the experimental pool body 1 is aerated at multiple points through the plurality of aeration ports 13, so as to improve the aeration effect, thereby improving the uniformity of aeration, and then effectively providing a good mixing effect of the liquid.

[0024] Further, such as Figure 2-Figure 8 As shown, a plurality of brackets 2 are provided on the top of the partition 15; the bracket 2 is fixedly connected to the top of the partition 15; a connecting rod 21 is fixedly connected to the middle of the bracket 2; an impeller 22 is sleeved on the side wall of the connecting rod 21; a diverter 23 is fixedly connected to the end of the connecting rod 21. During operation, when aeration is performed through the air pump 14, an impeller 22 is provided in the middle of the bracket 2 through the bracket 2 arranged on the top of the aeration port 13, so that when air is pumped out from the aeration port 13, the air will blow the impeller 22 to rotate, so that the impeller 22 drives the surrounding liquid to mix, thereby improving the mixing effect of the liquid inside the experimental pool body 1, thereby increasing the mixing effect of the medicinal liquid and the mother liquor, so that the medicinal liquid can be evenly mixed with the mother liquor inside the experimental pool body 1, thereby effectively improving the chemical reaction effect in the liquid.

[0025] Further, such as Figure 2 , Figure 3 , Figure 5 and Figure 6As shown, an anti-corrosion layer 31 is fixedly connected to the top of the partition 15; a heating tube 3 is fixedly connected to the top of the partition 15; a mounting groove 33 is opened on the side wall of the anti-corrosion layer 31; and a thermal insulation layer 32 is fixedly connected to the inner wall of the mounting groove 33. During operation, the anti-corrosion layer 31 has a certain anti-corrosion property through the arranged anti-corrosion layer 31, thereby effectively reducing the erosion of the liquid inside the experimental pool body 1. By means of the heating tube 3 arranged at the bottom of the experimental pool body 1, the liquid inside the experimental pool body 1 can be heated to a suitable temperature when processing the liquid, and the temperature can be controlled by the controller 17 arranged on the side wall of the experimental pool body 1. By means of the thermal insulation layer 32 arranged inside the mounting groove 33, the thermal insulation effect of the equipment is effectively improved, thereby reducing the diffusion of heat, thereby effectively increasing the mixing effect of the liquid inside the experimental pool body 1 and the liquid medicine. By improving the control of the temperature inside the experimental pool body 1, the time of the chemical reaction of the liquid inside the experimental pool body 1 is effectively reduced, thereby increasing the reaction effect.

[0026] Further, such as Figure 2-Figure 5 As shown, a dustproof plate 4 is fixedly connected to the inner wall of the air hole 16; a plurality of through holes are provided in the middle of the dustproof plate 4; a sealing ball 41 is installed on the top of the aeration port 13; a ball groove 42 is provided at the bottom of the dustproof plate 4. When working, a movable sealing ball 41 is provided inside the air hole 16 through the dustproof plate 4 provided inside the air pump 14. When the air pump 14 is not running, the sealing ball 41 will fall to the top of the aeration port 13 under the action of its own gravity, and then block the aeration port 13, thereby reducing the liquid inside the experimental pool body 1 from entering the annular air pipe 11 from the aeration port 13. When the air pump 14 is running, the air will be blown out from the aeration port 13. , and then it is blown up by the airflow, and a protruding column is provided at the end of the dustproof plate 4, and a ball groove 42 is provided at the bottom of the column, that is, the contact part with the sealing ball 41. When the sealing ball 41 is blown, the sealing ball 41 will be blown into the ball groove 42, and then the sealing ball 41 will be fixed in the ball groove 42. By fixing the blown sealing ball 41 in the ball groove 42, the sealing ball 41 is blown in the central part of the air hole 16, thereby effectively improving the uniformity of the blown airflow. By setting the sealing ball 41, the reflux of liquid in the experimental pool body 1 is effectively reduced, and at the same time, the uniformity of the blown airflow is improved, thereby effectively improving the operating stability of the impeller 22.

[0027] Further, such as Figure 2 , Figure 3 , Figure 4 and Figure 7 As shown, a plurality of through holes 5 are opened and closed in the middle of the thermal insulation layer 32; the through holes 5 are symmetrically arranged; reinforcing ribs 51 are fixedly connected to the inner wall of the through holes 5. When working, the reinforcing ribs 51 are arranged inside the thermal insulation layer 32, and the reinforcing ribs 51 are evenly placed inside the thermal insulation layer 32, so as to effectively improve the overall strength of the thermal insulation layer 32.

[0028] Further, such as Figure 8 As shown, the end of the diverter 23 is arc-shaped; the diverter 23 is hemispherical. When working, by setting the end of the diverter 23 to an arc shape, when the air is blown from the aeration port 13, the blown air contacts the end of the diverter 23, and then is diverted by the diverter 23, so that the air is blown from all sides of the diverter 23 to the impeller 22, so that the air is evenly dispersed, thereby effectively driving the impeller 22 to rotate and drive the flow of the surrounding liquid, thereby improving the mixing effect of the liquid medicine.

[0029] Working principle: 1. 300m 3 The rare earth mother liquor is stored in the 1# experimental pool with a capacity of 500m 3 .

[0030] Start the impurity removal process: 1. Rare earth mother solution: pH = 4.3, concentration: 0.3g / L, water temperature T = 11.7℃; 2. Add 5% sodium bicarbonate solution and continuously measure the pH of the mother liquor until the pH reaches 5.4; 3. When adding sodium bicarbonate solution, turn on the air compressor to aerate the bottom of the pool, and finish after 0.5h; 4. When adding sodium bicarbonate solution, add polyacrylamide (PAM) solution with a concentration of 0.7‰, totaling 0.4m3.

[0031] The sign of completion of impurity removal: the supernatant is clear and the bottom is visible, reference time is 3h.

[0032] The slag at the bottom of the pool is pumped to the filter press to obtain solid slag for inspection: burning test.

[0033] 2. Pump the supernatant into the 2# experimental pool with a capacity of 500m 3 .

[0034] Start the precipitation process: 1. Supernatant: pH = 5.4, water temperature T = 11.6 ℃; 2. Add 100m3 of 3% light industrial sodium carbonate solution; 3. When adding sodium carbonate solution, turn on the air compressor to aerate the bottom of the pool, and finish after 0.5h; 4. When adding sodium carbonate solution, add 0.7‰ polyacrylamide (PAM) solution, a total of 0.5 m 3 ; 5. Add 0.5 kg of hexamethylenetetramine solid when adding the sodium carbonate solution.

[0035] Signs of the end of precipitation: the supernatant is clear and the bottom is visible, reference time is 3.5h; the supernatant is titrated with oxalic acid solution, and no white precipitate is precipitated; the pH of the supernatant is 6.6-6.9.

[0036] The carbonate mixed rare earth at the bottom of the pool is pumped to the filter press for filtration to obtain concentrated carbonate rare earth, which is then sent for inspection: ignition test.

[0037] During aeration, the traditional aeration method mainly uses an air pump to inject gas into the liquid, so that the liquid inside the experimental pool body 1 surges inside the experimental pool body 1 under the action of the air pump, and has reached the effect of contact with air. Its aeration point is relatively single, which makes the aeration of the liquid inside the experimental pool body 1 uneven, and the aeration of the liquid inside the experimental pool body 1 is not uniform enough. Through the annular air pipe 11 set at the bottom of the experimental pool body 1, and the annular air pipe 11 is annular, and is evenly arranged from large to small, the annular air pipe 11 is connected through the connecting pipe 12, and the annular air pipe 11 is supplied with air through one or more air pumps 14, and a plurality of aeration ports 13 are evenly distributed on the top of the annular air pipe 11. When the liquid inside the experimental pool body 1 needs to be aerated During aeration, the liquid inside the experimental pool body 1 is aerated at multiple points through multiple aeration ports 13, so as to improve the aeration effect, thereby improving the uniformity of aeration, and thus effectively providing a good mixing effect of the liquid. When aeration is performed through the air pump 14, a bracket 2 is arranged on the top of the aeration port 13, and an impeller 22 is arranged in the middle of the bracket 2, so that when the air is pumped out from the aeration port 13, the air will blow the impeller 22 to rotate, so that the impeller 22 drives the surrounding liquid to mix, thereby improving the mixing effect of the liquid inside the experimental pool body 1, thereby increasing the mixing effect of the drug liquid and the mother liquid, so that the drug liquid can be evenly mixed with the mother liquid inside the experimental pool body 1, thereby effectively improving the chemical reaction effect in the liquid, and the anti-corrosion layer is set 31, the anti-corrosion layer 31 has a certain degree of anti-corrosion, thereby effectively reducing the erosion of the liquid inside the experimental pool body 1. The heating pipe 3 arranged at the bottom of the experimental pool body 1 allows the liquid inside the experimental pool body 1 to be heated to a suitable temperature when processing the liquid. The temperature can be controlled by the controller 17 arranged on the side wall of the experimental pool body 1. The heat preservation layer 32 arranged inside the mounting groove 33 effectively improves the heat preservation effect of the equipment, thereby reducing the heat diffusion, thereby effectively increasing the mixing effect of the liquid inside the experimental pool body 1 and the liquid medicine. By improving the control of the temperature inside the experimental pool body 1, the time of the chemical reaction of the liquid inside the experimental pool body 1 is effectively reduced, and the reaction effect is increased. By using the air pump 14 The dustproof plate 4 is arranged inside, and a movable sealing ball 41 is arranged inside the air hole 16. When the air pump 14 is not running, the sealing ball 41 will fall to the top of the aeration port 13 under the action of its own gravity, and then block the aeration port 13, thereby reducing the liquid inside the experimental pool body 1 from the aeration port 13 Entering the annular air pipe 11 inside. When the air pump 14 is running, air will be blown out from the aeration port 13 and then blown up by the airflow, and a protruding column is arranged at the end of the dustproof plate 4, and a ball groove 42 is opened at the bottom of the column, that is, the contact part with the sealing ball 41. When the sealing ball 41 is blown, the sealing ball 41 will be blown into the ball groove 42, and then the sealing ball 41 will be fixed in the ball groove 42. By fixing the blown sealing ball 41 in the ball groove 42,The sealing ball 41 is blown at the center of the air hole 16, thereby effectively improving the uniformity of the blown airflow. The sealing ball 41 is set to effectively reduce the reflux of liquid in the experimental pool body 1, and at the same time improve the uniformity of the blown airflow, thereby effectively improving the operating stability of the impeller 22. The reinforcing ribs 51 are set inside the insulation layer 32, and the reinforcing ribs 51 are evenly placed inside the insulation layer 32, thereby effectively improving the overall strength of the insulation layer 32. The end of the diverter 23 is set to an arc shape, when the air is blown from the aeration port 13, the blown air contacts the end of the diverter 23, and then is diverted by the diverter 23, so that the air is blown from the surroundings of the diverter 23 to the impeller 22, so that the air is evenly dispersed, thereby effectively driving the impeller 22 to rotate and drive the flow of the surrounding liquid, thereby improving the mixing effect of the liquid medicine.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for precipitating rare earth from ionic rare earth mother solution, characterized in that: The following steps are involved: S1: Prepare 300m³ of rare earth mother liquor and store it in the 1# experimental pool for impurity removal, the pool capacity is 500m³; S2: Add 5% sodium bicarbonate solution and continuously measure the pH value of the mother liquor until the pH reaches 5.4; S3: Then add a polyacrylamide solution with a concentration of 0.7‰, and start the air compressor to aerate the bottom of the pool for 0.5h while adding the sodium bicarbonate solution, and let the 1# experimental pool stand for 3h-4h to make the supernatant in the pool clear and see the bottom; S4: The supernatant is pumped to the 2# experimental pool for sedimentation treatment through a water pump. The pool capacity is 500m³. The bottom slag in the 1# experimental pool is pumped to the filter press to obtain solid slag, which is sent for inspection and burning test; S5: Add 100m³ of 3% light industrial sodium carbonate solution into the 2# experimental pool; at the same time, add 0.7‰ polyacrylamide solution and 0.5kg hexamethylenetetramine solid; S6: When adding sodium carbonate solution, 0.7‰ polyacrylamide solution and 0.5kg hexamethylenetetramine solid, turn on the air compressor to aerate the bottom of the pool for 0.5h. After the end, let it stand for 3h-4h until the supernatant is clear and the bottom is visible; S7: Finally, the carbonate mixed rare earth at the bottom of the pool is pumped to the filter press for filtration to obtain concentrated carbonate rare earth, which is then sent for calcination testing.

2. The method for precipitating rare earth from ionic rare earth mother solution according to claim 1, characterized in that: The rare earth mother liquor in S1 has a pH of 4.3, a concentration of 0.3 g / L, and a water temperature of 11.7°C.

3. The method for precipitating rare earth from ionic rare earth mother solution according to claim 1, characterized in that: When the sodium bicarbonate solution is added to S3, a polyacrylamide solution with a concentration of 0.7‰ is added at the same time, totaling 0.4m³.

4. The method for precipitating rare earth from ionic rare earth mother solution according to claim 1, characterized in that: The experimental pool proposed in S1 comprises an experimental pool body (1); an annular air pipe (11) is installed on the inner wall of the experimental pool body (1); a connecting pipe (12) is fixedly connected to the middle of the annular air pipe (11); a plurality of aeration ports (13) are fixedly connected to the middle of the annular air pipe (11); the aeration ports (13) are arranged in a circular array; a partition (15) is provided on the top of the aeration ports (13); the partition (15) is fixedly connected to the inner wall of the experimental pool body (1); a plurality of air holes (16) are opened in the middle of the partition (15); the positions of the air holes (16) are relatively corresponding to the positions of the aeration ports (13); and an air pump (14) is installed at the end of the connecting pipe (12).

5. The method for precipitating rare earth from ionic rare earth mother solution according to claim 4, characterized in that: A plurality of brackets (2) are provided on the top of the partition (15); the brackets (2) are fixedly connected to the top of the partition (15); a connecting rod (21) is fixedly connected to the middle of the bracket (2); an impeller (22) is sleeved on the side wall of the connecting rod (21); and a flow divider (23) is fixedly connected to the end of the connecting rod (21).

6. The method for precipitating rare earth from ionic rare earth mother solution according to claim 4, characterized in that: An anti-corrosion layer (31) is fixedly connected to the top of the partition (15); a heating pipe (3) is fixedly connected to the top of the partition (15); a mounting groove (33) is provided on the side wall of the anti-corrosion layer (31); and a heat-insulating layer (32) is fixedly connected to the inner wall of the mounting groove (33).

7. The method for precipitating rare earth from ionic rare earth mother solution according to claim 4, characterized in that: A dustproof plate (4) is fixedly connected to the inner wall of the air hole (16); a plurality of through holes are provided in the middle of the dustproof plate (4); a sealing ball (41) is installed at the top of the aeration port (13); and a ball groove (42) is provided at the bottom of the dustproof plate (4).

8. The method for precipitating rare earth from ionic rare earth mother solution according to claim 6, characterized in that: A plurality of groups of through holes (5) are opened and closed in the middle of the thermal insulation layer (32); the through holes (5) are symmetrically arranged; and reinforcing ribs (51) are fixedly connected to the inner walls of the through holes (5).

9. The method for precipitating rare earth from ionic rare earth mother solution according to claim 5, characterized in that: The end of the flow divider (23) is arc-shaped; the flow divider (23) is hemispherical.

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