A lithium carbonate filtration and regeneration system

Abstract

The utility model discloses a lithium carbonate filtration and regeneration system, wherein device A comprises a filter for filtering lithium carbonate solution, wherein the filter comprises a drainage area, a filtration area and a filtrate area from bottom to top, wherein a raw liquid pipeline is connected to the lower side of the filtration area, a filtered semen pipeline, a return water pipeline and an industrial water pipeline are connected to the filtrate area, a sewage pipeline is connected to the bottom of the drainage area, a return water pipeline is connected to the filtrate area, and a buffer tank is arranged between the return water pipeline and the filter; a control valve a is arranged on the raw liquid pipeline, a pressure transmitter a and a control valve f are arranged on the filtered semen pipeline, a control valve i is arranged on the sewage pipeline, a manual valve a and a control valve c are arranged on the return water pipeline, and a control valve d is arranged on the industrial water pipeline. Through the technical scheme, the filtration system can be operated under system pressure to automatically filter, automatically clean, automatically discharge sewage, and seamlessly switch between two routes to ensure uninterrupted production, and an automated system can be operated to automatically regenerate the filter element in the later stage.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid filtration, in particular to a lithium carbonate filtration and regeneration system. Background Art

[0002] With the development of new energy in my country, new energy forms are constantly entering the people's lives as the mainstream. The production and manufacturing of various new energy raw materials urgently need large-scale and high-quality mass production. Among them, the production and extraction of lithium carbonate, a raw material for battery manufacturing that is the basis of new energy, is a very important front-end process. Lithium carbonate is purified and supplied in the form of a solution through various chemical and physical processes for easy back-end application.

[0003] Lithium carbonate solution needs to be further ultra-precision filtered before entering crystallization to facilitate back-end production purification. The original ultrafiltration method is to use a large filter pool to process it through sedimentation and multi-stage filtration. This method is feasible but the efficiency is too low. It will also cause the saturated solution to crystallize prematurely due to the decrease in temperature, and the subsequent stain treatment is time-consuming and labor-intensive.

[0004] A Chinese patent document disclosed a membrane filter on February 23, 2012, with the publication number CN202224064U. The solution includes a clear liquid port, an exhaust port, a filter housing, a liquid inlet, a reflux port, a slag discharge port, piping and a recoil tank. The clear liquid port is arranged on the upper part of the filter housing, the exhaust port is arranged on the side of the filter housing, the liquid inlet is arranged in the middle of the filter housing, the lower part of the filter housing is a conical housing, the conical housing is provided with a reflux port, the bottom of the conical housing is provided with a slag discharge port, and the filter housing is connected to the recoil tank through piping.

[0005] After a period of use, the filtered residues of the membrane filter disclosed in the above-mentioned prior art will accumulate on the filter membrane. After the filter element reaches saturation, it is impossible to judge and start backwashing the filter element and regenerate the filter element. Utility Model Content

[0006] In view of the fact that the above-mentioned prior art cannot quickly filter and clean under system pressure during filtering operation, the utility model provides a lithium carbonate filtering and regeneration system. Through this technical solution, lithium carbonate can be filtered and the subsequent filter element can be cleaned and regenerated.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions: a lithium carbonate filtration and regeneration system, comprising a device A, wherein the device A comprises a filter for filtering a lithium carbonate solution and a raw liquid pipeline, a filtered semen pipeline, a sewage pipeline, a return water pipeline and an industrial water pipeline connected to the filter; the filter comprises a drainage area, a filtration area and a filtrate area from bottom to top, the raw liquid pipeline is connected to the lower side of the filtration area, the filtered semen pipeline, the return water pipeline and the industrial water pipeline are connected to the filtrate area, the sewage pipeline is connected to the bottom of the drainage area, the return water pipeline is connected to the filtrate area, and a buffer tank is provided between the return water pipeline and the filter; a control valve a is provided on the raw liquid pipeline, a pressure transmitter a and a control valve f are provided on the filtered semen pipeline in sequence from the inlet end to the outlet end, a control valve i is provided on the sewage pipeline, a manual valve a and a control valve c are provided on the return water pipeline between the buffer tank and the filter, and a control valve d is provided on the industrial water pipeline.

[0008] Furthermore, the raw liquid pipeline branches off into a first water return branch line, the first water return branch line is located between the control valve a and the outlet end of the raw liquid pipeline, and a control valve b is provided on the first water return branch line.

[0009] Furthermore, the sewage pipeline branches into a first sewage branch line, the inlet end of the first sewage branch line is located on the upper side of the filtration area, and the outlet end is connected to the sewage pipeline, and the first sewage branch line is provided with a pressure transmitter b and a control valve g along the conveying direction; the first sewage branch line branches into a second sewage branch line connected to the filtrate area, and the outlet end of the second sewage branch line is located at the top of the filtrate area, and the outlet end is located between the pressure transmitter b and the control valve g, and the second sewage branch line is provided with a control valve e.

[0010] Furthermore, the first sewage branch line branches off into a third sewage branch line, the inlet end of the third sewage branch line is located between the pressure transmitter b and the outlet end of the second sewage branch line, and a manual valve c is provided on the third sewage branch line.

[0011] Furthermore, the sewage pipeline branches into a second return branch line, the inlet end of the second return branch line is located between the control valve i and the sewage pipeline inlet end, the outlet end of the second return branch line is connected to the return pipeline, and the second return branch line is provided with a solenoid valve h.

[0012] Furthermore, the filtrate area is also provided with an unqualified brine pipeline, the unqualified brine pipeline is connected to the return water pipeline, and a manual valve b is provided on the unqualified brine pipeline.

[0013] Furthermore, the sewage pipeline is also connected to a hydrochloric acid pipeline, and the hydrochloric acid pipeline is provided with a control valve k and a manual valve e in sequence from the inlet end to the outlet end. The hydrochloric acid pipeline is connected to a hydrochloric acid collection pipeline between the control valve k and the manual valve e, and the hydrochloric acid collection pipeline is provided with a control valve j.

[0014] Furthermore, the hydrochloric acid pipeline is connected to a compressed air pipeline, and the compressed air pipeline is provided with a manual valve d and a pulse valve along the air inlet direction.

[0015] Furthermore, it also includes device B, wherein device A is the same as device B, and filter a and filter b are respectively connected to the filtered semen pipeline, raw liquid pipeline, industrial water pipeline, return water pipeline, hydrochloric acid pipeline, hydrochloric acid collection pipeline and sewage pipeline.

[0016] In summary, the utility model has the following beneficial effects:

[0017] (1) The pressurized brine enters the filter from the bottom drainage area of ​​the filter through the raw liquid pipeline for filtration. After the filtered liquid is filtered, it is discharged to the next process through the semen pipeline. At the same time, the gas in the filter is exhausted to the downstream. In this way, the filtration of the lithium hydrochloride solution and the collection of the filtrate can be completed. The control valve f is opened to exhaust, the manual valve a is normally open, and the opening and closing of the control valve c realizes the opening and closing of the return water pipeline connected to the filter, and the brine is discharged in cooperation with the buffer tank.

[0018] (2) When the filter element reaches saturation capacity, the pressure difference can be calculated through the difference of the pressure transmitter. When the set pressure difference is reached, the system starts the backwashing procedure; the backwashing process of device A starts to run, at this time, the control valves of the raw liquid pipeline and the filtered semen pipeline are closed, and after the pressure is released, the pressurized liquid enters the buffer tank to avoid the pressurized fluid causing water hammer impact on the pipeline. The pressurized clean water is injected from the filtrate area of ​​the filter, and after filling the filter, it flows from the top to the sewage pipeline for back-end treatment; in this way, the clean water flushes the filter element from the inside to the outside, so that the dirt blocked outside the filter element is taken away and flows from the bottom of the filter into the sewage pipeline for back-end treatment.

[0019] (3) When the entire process unit runs normally for a period of time, the filtration efficiency will drop significantly. Therefore, it can be converted into soluble brine through strong acid washing, and then the filter element can be cleaned again through water washing to complete the cleaning and regeneration of the filter element.

[0020] (4) After the acid wash is completed, rinse with clean water, and then use compressed air to enter the filter through the pulse valve. The pulse airflow input will cause vibrations in the filter element gap, which is conducive to shaking off the attached particles and making the filter element regenerated more thoroughly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the layout of the lithium carbonate filtration and regeneration system.

[0022] Figure 2 It is a structural schematic diagram of the lithium carbonate filtration and regeneration system.

[0023] The reference numerals are as follows: 100, device A; 110, filter a; 120, drainage area; 130, filtration area; 140, filtrate area; 150, hydrochloric acid pipeline; 160, hydrochloric acid collection pipeline; 170, compressed air pipeline; 111, raw liquid pipeline; 112, filtered semen pipeline; 113, sewage pipeline; 114, return water pipeline; 115, industrial water pipeline; 1110, first return water branch line; 1111, second return water branch line; 1112, unqualified brine pipeline; 1130, first sewage branch line; 1131, first Second sewage branch line; 1132, third sewage branch line; 200, device B; 210, filter b; 2, control valve a; 3, control valve b; 4, control valve c; 5, manual valve a; 6, buffer tank; 7, manual valve b; 8, control valve d; 9, control valve e; 10, pressure transmitter a; 11, pressure transmitter b; 12, control valve f; 13, control valve g; 14, manual valve c; 15, manual valve d; 16, solenoid valve h; 17, manual valve e; 18, control valve i; 19, control valve j; 20, control valve k; 21, pulse valve. DETAILED DESCRIPTION

[0024] The utility model is further described in detail below in conjunction with the embodiments.

[0025] Embodiment 1:

[0026] When implementing, Figure 1 to Figure 2 As shown, a lithium carbonate filtration and regeneration system includes a device A100, wherein the device A100 includes a filter for filtering a lithium carbonate solution and a raw liquid pipeline 111, a filtered semen pipeline 112, a sewage pipeline 113, a return water pipeline 114, and an industrial water pipeline 115 connected to the filter; the filter includes a drainage area 120, a filtration area 130, and a filtrate area 140 from bottom to top, the raw liquid pipeline 111 is connected to the lower side of the filtration area 130, the filtered semen pipeline 112, the return water pipeline 114, and the industrial water pipeline 115 are connected To the filtrate area 140, the sewage pipeline 113 is connected to the bottom of the drainage area 120, and the return pipeline 114 is connected to the filtrate area 140. A buffer tank 6 is provided between the return pipeline 114 and the filter; a control valve a2 is provided on the raw liquid pipeline 111, and the filtered semen pipeline 112 is provided with a pressure transmitter a10 and a control valve f12 in sequence from the inlet end to the outlet end, a control valve i18 is provided on the sewage pipeline 113, and a manual valve a5 and a control valve c4 are provided on the return pipeline 114 between the buffer tank 6 and the filter, and a control valve d8 is provided on the industrial water pipeline 115.

[0027] The pressurized brine liquid enters the filter through the raw liquid pipeline 111 for filtration, and the filtered liquid is discharged to the next process through the semen pipeline 112. At the same time, the gas in the filter is exhausted to the downstream, so that the filtration of the lithium hydrochloride solution and the collection of the filtrate can be completed. The control valve f12 is opened to exhaust, the manual valve a5 is normally open, and the return water pipeline 114 connected to the filter is opened and closed by the opening and closing of the control valve c4, and the brine is discharged in cooperation with the buffer tank.

[0028] Embodiment 2:

[0029] This embodiment provides a lithium carbonate filtration and regeneration system as in Embodiment 1, including device A100, wherein device A100 includes a filter for filtering a lithium carbonate solution and a raw liquid pipeline 111, a filtered semen pipeline 112, a sewage pipeline 113, a return water pipeline 114 and an industrial water pipeline 115 connected to the filter.

[0030] On the basis of Example 1, the sewage pipeline 113 branches into a first sewage branch line 1130, the inlet end of the first sewage branch line 1130 is located on the upper side of the filtration area 130, and the outlet end is connected to the sewage pipeline 113, and the first sewage branch line 1130 is provided with a pressure transmitter b11 and a control valve g13 along the conveying direction; the first sewage branch line 1130 branches into a second sewage branch line 1131 connected to the filtrate area 140, the outlet end of the second sewage branch line 1131 is located at the top of the filtrate area 140, the outlet end is located between the pressure transmitter b11 and the control valve g13, and the second sewage branch line 1131 is provided with a control valve e9. The first sewage branch line 1130 branches into a third sewage branch line 1132, the inlet end of the third sewage branch line 1132 is located between the pressure transmitter b11 and the outlet end of the second sewage branch line 1131, and the third sewage branch line 1132 is provided with a manual valve c14.

[0031] During filtration, manual valves a5 and e17 are in the normally open state; the other valves are in the normally closed state; when the filter element reaches the saturated capacity, the pressure difference can be calculated through the difference of the pressure transmitter. When the pressure difference reaches the set pressure difference, the system starts the backwashing procedure, at this time, close the control valve a2 and the control valve f12, and then open the control valve c4 to release the system pressure, and the pressurized liquid enters the buffer tank to avoid the pressurized fluid causing water hammer impact on the pipeline, and then open the control valve b3, at this time, the salt water returns to the pool along the return pipeline 114 and is re- After the liquid is drained, the control valve b3 and the control valve c4 are closed; the control valve d8 is opened for water injection and the control valve g13 is opened for sewage discharge. The pressurized clean water is injected from the top of the filter. After the filter is filled, it flows into the sewage pipeline 113 from the top manual valve e17 for back-end treatment; the control valve i18 is opened and the control valve g13 is closed. The clean water flushes the filter element from the inside to the outside, so that the dirt blocked outside the filter element is taken away from the bottom of the filter through the control valve i18 and flows into the sewage pipeline 113 for back-end treatment.

[0032] Embodiment 3:

[0033] This embodiment provides a lithium carbonate filtration and regeneration system as in Embodiment 1, including device A100, wherein device A100 includes a filter for filtering a lithium carbonate solution and a raw liquid pipeline 111, a filtered semen pipeline 112, a sewage pipeline 113, a return water pipeline 114 and an industrial water pipeline 115 connected to the filter.

[0034] On the basis of Example 1, the raw liquid pipeline 111 branches into a first water return branch 1110, the first water return branch 1110 is located between the control valve a2 and the outlet end of the raw liquid pipeline 111, and a control valve b3 is provided on the first water return branch 1110. The sewage pipeline 113 branches into a second water return branch 1111, the inlet end of the second water return branch 1111 is located between the control valve i18 and the inlet end of the sewage pipeline 113, the outlet end of the second water return branch 1111 is connected to the water return pipeline 114, and a solenoid valve h16 is provided on the second water return branch 1111.

[0035] Embodiment 4:

[0036] This embodiment provides a lithium carbonate filtration and regeneration system as in Embodiment 1, including device A100, wherein device A100 includes a filter for filtering a lithium carbonate solution and a raw liquid pipeline 111, a filtered semen pipeline 112, a sewage pipeline 113, a return water pipeline 114 and an industrial water pipeline 115 connected to the filter.

[0037] On the basis of Example 1, the filtrate area 140 is further provided with an unqualified brine pipeline 1112 , which is connected to the return water pipeline 114 , and a manual valve b7 is provided on the unqualified brine pipeline 1112 .

[0038] During implementation, the sewage pipeline 113 is also connected to the hydrochloric acid pipeline 150, and the hydrochloric acid pipeline 150 is provided with a control valve k20 and a manual valve e17 in sequence from the inlet end to the outlet end. The hydrochloric acid pipeline 150 is connected to a hydrochloric acid collection pipeline 160 between the control valve k20 and the manual valve e17, and a control valve j19 is provided on the hydrochloric acid collection pipeline 160. The hydrochloric acid pipeline 150 is connected to a compressed air pipeline 170, and the compressed air pipeline 170 is provided with a manual valve d15 and a pulse valve 21 along the air intake direction.

[0039] Embodiment 5:

[0040] When implementing, Figure 1 to Figure 2 As shown, a lithium carbonate filtration and regeneration system includes a device A100, wherein the device A100 includes a filter for filtering a lithium carbonate solution and a raw liquid pipeline 111, a filtered semen pipeline 112, a sewage pipeline 113, a return water pipeline 114, and an industrial water pipeline 115 connected to the filter; the filter includes a drainage area 120, a filtration area 130, and a filtrate area 140 from bottom to top, the raw liquid pipeline 111 is connected to the lower side of the filtration area 130, the filtered semen pipeline 112, the return water pipeline 114, and the industrial water pipeline 115 are connected To the filtrate area 140, the sewage pipeline 113 is connected to the bottom of the drainage area 120, and the return pipeline 114 is connected to the filtrate area 140. A buffer tank 6 is provided between the return pipeline 114 and the filter; a control valve a2 is provided on the raw liquid pipeline 111, and the filtered semen pipeline 112 is provided with a pressure transmitter a10 and a control valve f12 in sequence from the inlet end to the outlet end, a control valve i18 is provided on the sewage pipeline 113, and a manual valve a5 and a control valve c4 are provided on the return pipeline 114 between the buffer tank 6 and the filter, and a control valve d8 is provided on the industrial water pipeline 115.

[0041] On the basis of Examples 1 to 4, device B200 is also included, wherein device A100 is the same as device B200, and filter a110 and filter b210 are respectively connected to the filtered semen pipeline 112, the raw liquid pipeline 111, the industrial water pipeline 115, the return water pipeline 114, the hydrochloric acid pipeline 150, the hydrochloric acid collection pipeline 160 and the sewage pipeline 113.

[0042] Backwashing and sewage discharge process: When the filter element reaches saturation capacity, the pressure difference can be calculated through the difference of the pressure transmitter. When the set pressure difference is reached, the system starts the backwashing program. At this time, the control valve a2 and the control valve f12 are closed, and the control valve c4 is opened to release the system pressure. The pressurized liquid enters the buffer tank to avoid water hammer impact on the pipeline caused by the pressurized fluid. Then the control valve b3 is opened. At this time, the salt water returns to the pool along the return pipeline 114 for reuse. After the liquid is discharged, the control valve b3 and the control valve c4 are closed; the control valve d8 is opened for water injection and the control valve g13 is opened for sewage discharge. The pressurized clean water is injected from the top of the filter. After the filter is filled, it flows into the sewage pipeline 113 from the top manual valve e17 to the back-end treatment; the control valve i18 is opened, and the control valve g13 is closed. The clean water flushes the filter element from the inside to the outside of the filter element, so that the dirt blocked outside the filter element is taken away from the bottom of the filter through the control valve i18 and flows into the sewage pipeline 113 to the back-end treatment. At this time, the backwash process is completed, and all control valves are reset to the initial state, waiting for the switching of device B200.

[0043] Regeneration process of the filter element: When the entire process device runs normally for a period of time, the filtration efficiency will drop significantly. The main reason is that the micropores of the filter element are blocked by the fine particles deposited in the salt water. The simple liquid backwashing method can no longer solve the problem. In view of the fact that the blocked particles are various salt dust particles in nature, they can be converted into soluble salt water through strong acid washing, and the filter element can be cleaned again by water washing; after the acid washing is completed, it is rinsed once with clean water, and compressed air is used to enter the filter through the pulse valve 21. When the pulse airflow is input, it will vibrate the gap of the filter element, and the attached particles will be shaken off, which makes the regeneration of the filter element more thorough. After the liquid is drained according to the backwashing and sewage discharge process, all control valves are closed, manual valve e17 is manually opened, and manual valve a5 and manual valve b7 are closed; control valve k20 is opened to inject hydrogen chloride solution through the hydrochloric acid pipeline 150 until it is full, and control valve k20 is closed. After soaking for the set time, control valve j19 is opened to pass through the hydrochloric acid collection pipeline 160 to the collection point, and pulse valve 21 is opened to use compressed air to purge the hydrochloric acid pipeline 150 once; control valve j19 is closed, control valve d8 is opened, and control valve g13 is opened for backwashing, and pulse valve 21 is opened again to perform multiple pulse purges on the filter; at this point, the acid washing regeneration purge is completed, and all valves are restored to their initial state; similarly, the same method is used to regenerate the B200 area of ​​the device.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lithium carbonate filtration and regeneration system, characterized in that: The device A (100) comprises a filter for filtering a lithium carbonate solution, and a raw liquid pipeline (111), a filtered semen pipeline (112), a sewage pipeline (113), a return water pipeline (114), and an industrial water pipeline (115) connected to the filter; The filter comprises, from bottom to top, a drainage area (120), a filtration area (130), and a filtrate area (140); the raw liquid pipeline (111) is connected to the lower side of the filtration area (130); the filtered semen pipeline (112), the return water pipeline (114), and the industrial water pipeline (115) are connected to the filtrate area (140); the sewage pipeline (113) is connected to the bottom of the drainage area (120); the return water pipeline (114) is connected to the filtrate area (140); and a buffer tank (6) is provided between the return water pipeline (114) and the filter; The raw liquid pipeline (111) is provided with a control valve a (2), the filtered semen pipeline (112) is provided with a pressure transmitter a (10) and a control valve f (12) in sequence from the inlet end to the outlet end, the sewage pipeline (113) is provided with a control valve i (18), the return water pipeline (114) is provided with a manual valve a (5) and a control valve c (4) between the buffer tank (6) and the filter, and the industrial water pipeline (115) is provided with a control valve d (8).

2. The lithium carbonate filtration and regeneration system according to claim 1, characterized in that: The raw liquid pipeline (111) branches into a first water return branch line (1110), the first water return branch line (1110) is located between the control valve a (2) and the outlet end of the raw liquid pipeline (111), and the first water return branch line (1110) is provided with a control valve b (3).

3. The lithium carbonate filtration and regeneration system according to claim 1, characterized in that: The sewage pipeline (113) branches into a first sewage branch line (1130); the inlet end of the first sewage branch line (1130) is located on the upper side of the filtration area (130); the outlet end is connected to the sewage pipeline (113); the first sewage branch line (1130) is provided with a pressure transmitter b (11) and a control valve g (13) along the conveying direction; the first sewage branch line (1130) branches into a second sewage branch line (1131) connected to the filtrate area (140); the outlet end of the second sewage branch line (1131) is located at the top of the filtrate area (140); the outlet end is located between the pressure transmitter b (11) and the control valve g (13); the second sewage branch line (1131) is provided with a control valve e (9).

4. The lithium carbonate filtration and regeneration system according to claim 3, characterized in that: The first sewage branch line (1130) branches into a third sewage branch line (1132), the inlet end of the third sewage branch line (1132) is located between the pressure transmitter b (11) and the outlet end of the second sewage branch line (1131), and the third sewage branch line (1132) is provided with a manual valve c (14).

5. The lithium carbonate filtration and regeneration system according to claim 1, characterized in that: The sewage pipeline (113) branches into a second water return branch line (1111); the inlet end of the second water return branch line (1111) is located between the control valve i (18) and the inlet end of the sewage pipeline (113); the outlet end of the second water return branch line (1111) is connected to the water return pipeline (114); and the second water return branch line (1111) is provided with a solenoid valve h (16).

6. The lithium carbonate filtration and regeneration system according to claim 1, characterized in that: The filtrate area (140) is further provided with an unqualified brine pipeline (1112), the unqualified brine pipeline (1112) is connected to the return water pipeline (114), and a manual valve b (7) is provided on the unqualified brine pipeline (1112).

7. The lithium carbonate filtration and regeneration system according to claim 1, characterized in that: The sewage pipeline (113) is also connected to a hydrochloric acid pipeline (150), and the hydrochloric acid pipeline (150) is provided with a control valve k (20) and a manual valve e (17) in sequence from the inlet end to the outlet end. The hydrochloric acid pipeline (150) is connected to a hydrochloric acid collection pipeline (160) between the control valve k (20) and the manual valve e (17), and the hydrochloric acid collection pipeline (160) is provided with a control valve j (19).

8. The lithium carbonate filtration and regeneration system according to claim 7, characterized in that: The hydrochloric acid pipeline (150) is connected to a compressed air pipeline (170), and the compressed air pipeline (170) is provided with a manual valve d (15) and a pulse valve (21) along the air intake direction.

9. The lithium carbonate filtration and regeneration system according to claim 1, characterized in that: It also includes a device B (200), wherein the device A (100) is the same as the device B (200), and the filter a (110) and the filter b (210) are respectively connected to the filtered semen pipeline (112), the raw liquid pipeline (111), the industrial water pipeline (115), the return water pipeline (114), the hydrochloric acid pipeline (150), the hydrochloric acid collection pipeline (160) and the sewage pipeline (113).

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