Ternary precursor mother liquor recovery device

Abstract

The utility model relates to the technical field of lithium battery processing, and discloses a ternary precursor mother liquor recovery device which comprises a slurry storage tank, an inlet of the first filtering equipment is communicated with an outlet of the slurry storage tank through a first feeding pump, and an outlet of the first filtering equipment is communicated with an inlet of the slurry storage tank; the turbidity meter is arranged on the outlet of the first filtering equipment and is used for detecting the turbidity of the mother liquor at the outlet of the first filtering equipment; an inlet of the mother liquor storage tank is communicated with an outlet of the first filtering equipment; the second filtering equipment comprises a shell, a microporous filter element arranged in the shell, a feed port, a slag discharge port and a liquid discharge port, the feed port, the slag discharge port and the liquid discharge port are formed in the shell, an outlet of the mother liquor storage tank is communicated with the feed port through a second feed pump, mother liquor flowing into the feed port is filtered by the microporous filter element and then is discharged from the liquid discharge port, and the slag discharge port is communicated with the microporous filter element. According to the recovery device for the ternary precursor mother liquor, the yield of the mother liquor can be improved, and the quality of recovered slurry is kept stable.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery processing, in particular to a recovery device for a ternary precursor mother liquid. Background Art

[0002] The mainstream method for the production of ternary precursors is the chemical coprecipitation method. The chemical coprecipitation method mainly involves mixing metal salts into an appropriate solution, adding a precipitant and a complexing agent, and coprecipitating metal ions to form a ternary precursor. The main components of the mother liquor in its production process are a small amount of nickel-cobalt-manganese hydroxide precipitate, sulfate ions, sodium ions, and free ammonia. The nickel-cobalt-manganese hydroxide precipitate in the mother liquor is smaller in particle size than the ternary precursor product. It is formed when some small-sized particles penetrate the filter cloth and flow out with the mother liquor during the solid-liquid separation process. At present, the main processing process of the mother liquor produced by the ternary precursor is: pH adjustment, steam stripping and deammoniation to recover ammonia, heavy metal precipitation, pH backfilling, and MVR evaporation and crystallization; after the heavy metal precipitation in the wastewater is intercepted, it needs to be treated with acid dissolution, the treatment cost is high, the quality of the recovered mother liquor cannot be kept stable, and the yield of the material has room for improvement. Utility Model Content

[0003] The utility model aims to provide a recovery device for a ternary precursor mother liquor, which can improve the yield of the mother liquor and keep the quality of the recovered mother liquor stable.

[0004] In order to achieve the above object, the utility model provides a recovery device for a ternary precursor mother liquid, comprising:

[0005] A slurry storage tank, used for storing ternary precursor mother liquor;

[0006] a first filtering device, the inlet of which is connected to the outlet of the slurry storage tank through a first feed pump, and the outlet of the first filtering device is connected to the inlet of the slurry storage tank;

[0007] A turbidity meter, installed at the outlet of the first filtering device, for detecting the turbidity of the mother liquor at the outlet of the first filtering device;

[0008] a mother liquid storage tank, the inlet of which is connected to the outlet of the first filtering device; and

[0009] The second filtering device includes a shell, a microporous filter element arranged in the shell, a feed port, a slag discharge port and a liquid discharge port arranged on the shell, the outlet of the mother liquor storage tank is connected with the feed port through a second feed pump, the mother liquor flowing into the feed port is filtered by the microporous filter element and then discharged from the liquid discharge port, and the slag discharge port is connected with the microporous filter element.

[0010] In some embodiments, a first valve is further included, wherein the first valve is installed on a pipeline connecting the outlet of the slurry storage tank and the first feed pump.

[0011] In some embodiments, a second valve and a third valve are also included, wherein the second valve is installed on a pipe connecting the outlet of the first filtration device and the inlet of the slurry storage tank, and the third valve is installed on a pipe connecting the outlet of the first filtration device and the inlet of the mother liquor storage tank.

[0012] In some embodiments, it also includes a pulping storage tank and a fourth valve, wherein the fourth valve is installed on the slag discharge port, and the slag discharge port is connected to the pulping storage tank.

[0013] In some embodiments, it also includes a wastewater storage tank and a fifth valve, wherein the fifth valve is installed on the drain port, and the drain port is connected to the inlet of the wastewater storage tank.

[0014] In some embodiments, a sixth valve is further included, and the outlet of the wastewater storage tank is connected to the first feed pump through the sixth valve.

[0015] In some embodiments, the second filtering device further comprises an ultrasonic generator, and the ultrasonic generator is mounted on a side wall of the housing.

[0016] In some embodiments, the second filtering device further includes a pickling inlet and a pickling outlet, wherein the pickling inlet is connected to the feed inlet, and the pickling outlet is connected to the drain outlet.

[0017] In some embodiments, a seventh valve is installed on the feed port; an eighth valve is installed on the pickling inlet; and a ninth valve is installed on the pickling outlet.

[0018] In some embodiments, the second filtering device further includes a tenth valve, and the tenth valve is installed on a pipe connecting the pickling outlet and the slag discharge outlet.

[0019] The utility model provides a recovery device for ternary precursor mother liquor, which has the following beneficial effects compared with the prior art:

[0020] The inlet of the mother liquor storage tank is connected to the outlet of the first filtering device, and the outlet of the mother liquor storage tank is connected to the feed port of the second filtering device through a second feed pump, so that the mother liquor can be filtered and recovered twice by the first filtering device and the second filtering device, and the inlet of the first filtering device is connected to the outlet of the slurry storage tank through the first feed pump, and the outlet of the first filtering device is connected to the inlet of the slurry storage tank, so that the mother liquor in the slurry storage tank is circulated and filtered by the first filtering device, which can improve the yield of the mother liquor and keep the quality of the recovered mother liquor stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1A schematic diagram of the overall principle structure of a ternary precursor mother liquor recovery device provided in an embodiment of the utility model.

[0022] Figure 2 A schematic diagram of the principle structure of the second filtering device of the ternary precursor mother liquor recovery device provided in an embodiment of the utility model.

[0023] In the figure: 1. slurry storage tank; 11. first valve; 2. first filtering device; 21. second valve; 22. third valve; 3. first feed pump; 4. turbidity meter; 5. mother liquor storage tank; 6. second filtering device; 61. shell; 62. microporous filter element; 63. feed port; 631. seventh valve; 64. slag discharge port; 641. fourth valve; 65. liquid discharge port; 651. fifth valve; 66. ultrasonic generator; 67. pickling inlet; 671. eighth valve; 68. pickling outlet; 681. ninth valve; 69. tenth valve; 7. second feed pump; 8. slurry storage tank; 9. wastewater storage tank; 10. sixth valve. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0025] It should be understood that, in the description of the present application, the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, that is, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, unless otherwise specified, "multiple" means two or more.

[0026] like Figure 1-2As shown, the recovery device of the ternary precursor mother liquor of the embodiment of the utility model includes a slurry storage tank 1, a first filtering device 2, a turbidity meter 4, a mother liquor storage tank 5 and a second filtering device 6. The slurry storage tank 1 is used to store the ternary precursor mother liquor; the inlet of the first filtering device 2 is connected to the outlet of the slurry storage tank 1 through the first feed pump 3, and the outlet of the first filtering device 2 is connected to the inlet of the slurry storage tank 1; the turbidity meter 4 is installed on the outlet of the first filtering device 2, and is used to detect the turbidity of the mother liquor at the outlet of the first filtering device 2; the inlet of the mother liquor storage tank 5 is connected to the outlet of the first filtering device 2; the second filtering device 6 includes a shell 61, a microporous filter element 62 arranged in the shell 61, a feed port 63, a slag discharge port 64 and a liquid discharge port 65 arranged on the shell 61, the outlet of the mother liquor storage tank 5 is connected to the feed port 63 through the second feed pump 7, the mother liquor flowing into the feed port 63 is filtered by the microporous filter element 62 and discharged from the liquid discharge port 65, and the slag discharge port 64 is connected to the microporous filter element 62.

[0027] Based on the above-mentioned arrangement, the inlet of the mother liquor storage tank 5 is connected with the outlet of the first filtering device 2, and the outlet of the mother liquor storage tank 5 is connected with the feed port of the second filtering device 6 through the second feed pump 7, so that the mother liquor can be filtered and recovered twice through the first filtering device 2 and the second filtering device 6, and the inlet of the first filtering device 2 is connected with the outlet of the slurry storage tank 1 through the first feed pump 3, and the outlet of the first filtering device 2 is connected with the inlet of the slurry storage tank 1, so that the mother liquor in the slurry storage tank 1 is circulated and filtered by the first filtering device 2, which can improve the yield of the mother liquor and keep the quality of the recovered mother liquor stable.

[0028] In one embodiment, the recovery device of the ternary precursor mother liquor further includes a first valve 11, which is installed on a pipeline connecting the outlet of the slurry storage tank 1 and the first feed pump 3. Specifically, two slurry storage tanks 1 are provided, and each slurry storage tank 1 is correspondingly installed with a first valve 11, and the first valve 11 can be used to control the slurry storage tank 1 to transport the mother liquor to the first filtering device 2.

[0029] In one embodiment, the recovery device of the ternary precursor mother liquor further includes a second valve 21 and a third valve 22, wherein the second valve 21 is installed on a pipe connecting the outlet of the first filter device 2 and the inlet of the slurry storage tank 1, and the third valve 22 is installed on a pipe connecting the outlet of the first filter device 2 and the inlet of the mother liquor storage tank 5. During operation, as the filter cloth of the first filter device 2 is gradually covered with particles, the pores of the filter cloth are gradually filled with particles, the filter cloth has a stronger ability to intercept particles in the mother liquor, the particles in the mother liquor are reduced, and gradually become clearer, and the turbidity data is monitored by the turbidity meter 4 at this time. When the turbidity meter 4 is lower than the preset value (the mother liquor is clear at this time), the third valve 22 is opened to allow the mother liquor to flow into the mother liquor storage tank 5; otherwise, the second valve 21 is opened to allow the mother liquor to flow into the slurry storage tank 1.

[0030] In one embodiment, the recovery device of the ternary precursor mother liquid further includes a slurry storage tank 8 and a fourth valve 641, the fourth valve 641 is installed on the slag discharge port 64, and the slag discharge port 64 is connected to the inlet of the slurry storage tank 8. The outlet of the slurry storage tank 8 is connected to the third feed pump 81. When in use, opening the fourth valve 641 can discharge the material attached to the inner wall of the microporous filter element 62.

[0031] In one embodiment, the recovery device of the ternary precursor mother liquor further includes a wastewater storage tank 9 and a fifth valve 651, wherein the fifth valve 651 is installed on a drain port 65, and the drain port 65 is connected to the inlet of the wastewater storage tank 9. By opening the fifth valve 651, the mother liquor filtered by the microporous filter element 62 can be discharged from the drain port 65 into the wastewater storage tank 9.

[0032] Furthermore, the recovery device of the ternary precursor mother liquor also includes a sixth valve 10, and the outlet of the wastewater storage tank 9 is connected to the first feed pump 3 through the sixth valve 10. By opening the sixth valve 10, the filtered wastewater in the wastewater storage tank 9 can be discharged through the first feed pump 3 to clean the first filtering device 2. The outlet of the wastewater storage tank 9 is also connected to a fourth feed pump 91. The fourth feed pump 91 is used to transport the filtered wastewater in the wastewater storage tank 9 to the wastewater treatment workshop for treatment.

[0033] In one embodiment, the second filtering device 6 further includes an ultrasonic generator 66, which is mounted on the side wall of the housing 61. By turning on the ultrasonic generator 66, the material attached to the inner wall of the microporous filter element 62 can be cleaned and discharged from the slag discharge port 64.

[0034] In one embodiment, the second filtering device 6 further includes a pickling inlet 67 and a pickling outlet 68, wherein the pickling inlet 67 is connected to the feed inlet 63, and the pickling outlet 68 is connected to the drain port 65. Acid is injected through the pickling inlet 67 to clean the microporous filter element 62, and waste liquid is discharged from the pickling outlet 68.

[0035] In one embodiment, a seventh valve 631 is installed on the feed port 63, an eighth valve 671 is installed on the pickling inlet 67, and a ninth valve 681 is installed on the pickling outlet 68. During filtration, the eighth valve 671 and the ninth valve 681 are closed, and during pickling, the eighth valve 671 and the ninth valve 681 are opened.

[0036] In one embodiment, the second filtering device 6 further includes a tenth valve 69, which is installed on a pipe connecting the pickling outlet 68 and the slag discharge outlet 64. When the second filtering device 6 is filtering the mother liquor, the tenth valve 69 is closed; when the second filtering device 6 is being cleaned, the tenth valve 69 is opened.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A ternary precursor mother liquor recovery device, characterized in that: include: A slurry storage tank (1), used for storing a ternary precursor mother solution; A first filtering device (2), the inlet of which is connected to the outlet of the slurry storage tank (1) through a first feed pump (3), and the outlet of the first filtering device (2) is connected to the inlet of the slurry storage tank (1); A turbidity meter (4), installed at the outlet of the first filtering device (2), and used to detect the turbidity of the mother liquor at the outlet of the first filtering device (2); a mother liquid storage tank (5), the inlet of which is connected to the outlet of the first filtering device (2); and The second filtering device (6) comprises a shell (61), a microporous filter element (62) arranged in the shell (61), a feed port (63), a slag discharge port (64) and a liquid discharge port (65) arranged on the shell (61), the outlet of the mother liquid storage tank (5) is connected to the feed port (63) through a second feed pump (7), the mother liquid flowing into the feed port (63) is filtered by the microporous filter element (62) and then discharged from the liquid discharge port (65), and the slag discharge port (64) is connected to the microporous filter element (62).

2. The recovery device for the ternary precursor mother liquid according to claim 1, characterized in that: It also includes a first valve (11), which is installed on a pipeline connecting the outlet of the slurry storage tank (1) and the first feed pump (3).

3. The recovery device for ternary precursor mother liquor according to claim 1, characterized in that: It also includes a second valve (21) and a third valve (22), wherein the second valve (21) is installed on a pipeline connecting the outlet of the first filtering device (2) and the inlet of the slurry storage tank (1), and the third valve (22) is installed on a pipeline connecting the outlet of the first filtering device (2) and the inlet of the mother liquor storage tank (5).

4. The recovery device for the ternary precursor mother liquid according to claim 1, characterized in that: It also includes a pulping storage tank (8) and a fourth valve (641), wherein the fourth valve (641) is installed on the slag discharge port (64), and the slag discharge port (64) is connected to the pulping storage tank (8).

5. The recovery device for ternary precursor mother liquor according to claim 1, characterized in that: It also includes a wastewater storage tank (9) and a fifth valve (651), wherein the fifth valve (651) is installed on the liquid discharge port (65), and the liquid discharge port (65) is connected to the inlet of the wastewater storage tank (9).

6. The recovery device for the ternary precursor mother liquid according to claim 5, characterized in that: It also includes a sixth valve (10), and the outlet of the wastewater storage tank (9) is connected to the first feed pump (3) through the sixth valve (10).

7. The recovery device for ternary precursor mother liquid according to claim 1, characterized in that: The second filtering device (6) further comprises an ultrasonic generator (66), wherein the ultrasonic generator (66) is mounted on a side wall of the housing (61).

8. The recovery device for ternary precursor mother liquid according to claim 1, characterized in that: The second filtering device (6) further comprises a pickling inlet (67) and a pickling outlet (68), wherein the pickling inlet (67) is connected to the feed inlet (63), and the pickling outlet (68) is connected to the drain outlet (65).

9. The recovery device for ternary precursor mother liquid according to claim 8, characterized in that: The feed port (63) is provided with a seventh valve (631); the pickling inlet (67) is provided with an eighth valve (671); and the pickling outlet (68) is provided with a ninth valve (681).

10. The ternary precursor mother liquid recovery device according to claim 8, characterized in that: The second filtering device (6) further comprises a tenth valve (69), and the tenth valve (69) is installed on a pipeline connecting the pickling outlet (68) and the slag discharge outlet (64).

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