CN218709764U - Device for recovering lithium from lithium precipitation mother liquor - Google Patents
Device for recovering lithium from lithium precipitation mother liquor Download PDFInfo
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- CN218709764U CN218709764U CN202222877749.7U CN202222877749U CN218709764U CN 218709764 U CN218709764 U CN 218709764U CN 202222877749 U CN202222877749 U CN 202222877749U CN 218709764 U CN218709764 U CN 218709764U
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Abstract
The utility model discloses a novel retrieve lithium in lithium mother liquor sinks device, the end of intaking of crystal separator is connected with heavy lithium mother liquor inlet tube, crystal separator's the end of giving out water is connected with the end of intaking of heater, crystal separator's steam outlet is connected with the steam inlet of heater, the play water outlet of heater is connected with crystal separator's return water mouth, crystal separator's magma export is connected with the thick liquid mouth that advances of ware, the magma export of thick ware is connected with first centrifuge's feed inlet, first centrifuge's solid material export is connected with the feed inlet of salt washing groove, first centrifuge's liquid outlet is connected with the feed inlet of mother liquor jar, the liquid outlet of thick ware is connected with the feed inlet of mother liquor jar, the discharge end in salt washing groove is connected with second centrifuge's feed inlet through the centrifuge charge pump, second centrifuge's liquid outlet is connected with the feed inlet end of salt washing groove. The utility model discloses simple structure can effectively improve the lithium rate of recovery, and the energy consumption is less relatively.
Description
Technical Field
The utility model relates to a lithium recovery unit field, concretely relates to device of retrieving lithium in heavy lithium mother liquor.
Background
Lithium is an important new energy material, and the demand of lithium in the fields of automobiles, wind power, IT and the like is continuously increased. Particularly, as the sales of electric automobiles in China rapidly increase, the demand of lithium also rapidly increases.
At present, the treatment methods for the lithium precipitation mother liquor are more, new impurities are not introduced in the process of recovering lithium carbonate by carrying out evaporation crystallization after freezing crystallization on the lithium precipitation mother liquor, and the quality of the recovered lithium carbonate product is better, so the lithium carbonate is widely applied, but the temperature in the lithium precipitation process is generally about 85-95 ℃, the freezing temperature is-10-0 ℃, the temperature difference is larger, and the energy consumption and the treatment efficiency are lower for treating a large amount of the lithium precipitation mother liquor.
The Chinese utility model patent CN106882822A proposes to recover lithium in the lithium precipitation mother liquor by a freezing salting-out method, and the process is as follows: freezing, crystallizing and finely filtering the lithium precipitation mother liquor, removing sodium sulfate decahydrate formed by crystallization, then carrying out evaporation concentration, adding sodium carbonate to form lithium carbonate precipitate, and filtering to obtain a filter cake, namely a lithium carbonate crude product, wherein the lithium carbonate crude product is subjected to sodium sulfate removal and repeated washing to obtain high-purity lithium carbonate; the mother liquor is returned to the freezing and crystallizing process. However, this method has the following problems: in the process of removing sodium sulfate by a freezing salting-out method, a large amount of Li is carried, so that the lithium recovery rate is low, the circulation volume of a freezing fine filtration material is large, the energy consumption is high, the process is complex, and the production cost is greatly increased.
Therefore, the existing method and device for recovering lithium from the lithium precipitation mother liquor are to be further improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the weak point among the prior art, providing a simple structure, can effectively improve the lithium rate of recovery, retrieve the device of lithium in the lithium mother liquor that sinks that the energy consumption is less relatively.
In order to achieve the above purpose, the utility model adopts the following scheme: the utility model provides a retrieve device of lithium in heavy lithium mother liquor, is including the crystal separation ware, the end of intaking of crystal separation ware is connected with heavy lithium mother liquor inlet tube, the play water end of crystal separation ware is connected with the end of intaking of heater, the steam outlet of crystal separation ware with the steam inlet of heater is connected, the play water end of heater is connected with the return water mouth of crystal separation ware, the magma export of crystal separation ware is connected with the thick liquid mouth that advances of thick liquid ware, the magma export of thick liquid ware is connected with first centrifuge's feed inlet, first centrifuge's solid material export is connected with the feed inlet of salt washing groove, first centrifuge's liquid outlet is connected with the feed inlet of mother liquor jar, the liquid outlet of thick liquid ware is connected with the feed inlet of mother liquor jar the discharge end of salt washing groove is connected through centrifuge feed pump and second centrifuge, the liquid outlet of second centrifuge with the feed inlet end of salt washing groove is connected, still includes saturated sodium chloride solution jar, the liquid outlet of saturated sodium chloride solution jar through the pump respectively with the centrifuge of first centrifuge, the centrifuge's feed inlet of second fluid tank is connected.
As another improvement of the device for recovering lithium in the lithium precipitation mother liquor, the liquid outlet end of the mother liquor tank is connected with the liquid inlet end of the crystallization separator through the mother liquor pump.
As another improvement of the device for recovering lithium in the lithium precipitation mother liquor, the liquid outlet end of the heater is connected with the liquid inlet end of the distilled water tank.
As the utility model discloses another kind of improvement of the device of retrieving lithium in the heavy lithium mother liquor, the play liquid end of distilled water jar is connected with the second feed liquor end of distilled water heat exchanger through distilled water pump, heavy lithium mother liquor inlet tube is connected with the first feed liquor end of distilled water heat exchanger, the first play liquid end of distilled water heat exchanger with the end of intaking of crystal separation ware is connected.
As the utility model discloses another kind of improvement of the device of retrieving lithium in the heavy lithium mother liquor, it is connected with the feed liquor end of former liquid jar to sink lithium mother liquor inlet tube, the play water end of former liquid jar is connected with the first feed liquor end of distilled water heat exchanger through the former liquid pump.
As another improvement of the device for recovering lithium in the lithium precipitation mother liquor, a compressor is arranged on a pipeline between the steam outlet of the crystallization separator and the steam inlet of the heater.
As another improvement of the device for recovering lithium in the lithium deposition mother liquor, a first stirring device is arranged in the thickener.
As another improvement of the device for recovering lithium in the lithium precipitation mother liquor, a second stirring device is arranged in the salt washing tank.
As another improvement of the device for recovering lithium in the lithium precipitation mother liquor, the liquid outlet end of the circulating liquid of the crystallization separator is connected with the liquid inlet end of the heater through a circulating pump.
As the utility model discloses another kind of improvement of the device of retrieving lithium in the lithium mother liquor sinks, the play liquid end of circulating pump is connected with the separator chamber, the thick liquid play liquid end of separator chamber is connected with the thick liquid jar of keeping in, the play liquid end of separator chamber is connected with the feed liquor end of crystallization separator.
To sum up, the utility model discloses for its beneficial effect of prior art is: the utility model discloses will sink lithium mother liquor changing waste into valuables, improve the utilization ratio of lithium, have very big economic benefits, also reduced the emission of waste water simultaneously. The utility model can concentrate the lithium content in the lithium precipitation mother liquor from 1g/L to more than 30g/L, and can be directly recycled to a lithium precipitation workshop; distilled water obtained by evaporation can be reused for production, and sodium chloride obtained by evaporation can be used as a byproduct, namely industrial salt. The utility model discloses many times crystallization salt washing is used for guaranteeing the rate of recovery of lithium, and the rate of recovery of actual lithium exceeds 99%.
Drawings
Fig. 1 is a schematic view of the present invention.
In the figure: 1. a crystallization separator; 2. a lithium precipitation mother liquor inlet pipe; 3. a heater; 4. a thickener; 5. a first centrifuge; 6. a salt washing tank; 7. a mother liquor tank; 8. a centrifuge feed pump; 9. a second centrifuge; 10. a saturated sodium chloride solution tank; 11. a flush pump; 12. a mother liquor pump; 13. a distilled water tank; 14. a distilled water pump; 15. a distilled water heat exchanger; 16. a stock solution tank; 17. a stock solution pump; 18. a compressor; 19. a first stirring device; 20. a second stirring device; 21. a circulation pump; 22. a separation chamber; 23. and (5) a concentrated solution temporary storage tank.
Detailed Description
The above and further features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in figure 1, a device for recovering lithium from a lithium precipitation mother solution comprises a crystallization separator 1, wherein a water inlet end of the crystallization separator 1 is connected with a lithium precipitation mother solution water inlet pipe 2, the lithium precipitation mother solution water inlet pipe 2 is connected with a liquid inlet end of a raw liquid tank 16, the lithium precipitation mother solution is sent to the raw liquid tank 16 through the lithium precipitation mother solution water inlet pipe 2 in the production process, wherein the lithium precipitation mother solution contains a large amount of carbonate, concentrated hydrochloric acid is added into the raw liquid tank 16 before entering an evaporation system, the pH value is adjusted to 3-5, and the carbonate in the lithium precipitation mother solution is removed.
The water outlet end of the raw liquid tank 16 is connected with the first liquid inlet end of the distilled water heat exchanger 15 through a raw liquid pump 17. In the production process, the energy of distilled water evaporated from the heater 3 is recovered through the distilled water heat exchanger 15, the lithium precipitation mother liquor is preheated and then enters the crystallization separator 1, and is continuously concentrated in the heater 3 to be crystallized to obtain sodium chloride crystals. The distilled water obtained by evaporation has good water quality and can be reused for production. The energy consumption can be effectively reduced by the distilled water heat exchanger 15.
The water outlet end of the crystallization separator 1 is connected with the water inlet end of the heater 3, the steam outlet of the crystallization separator 1 is connected with the steam inlet of the heater 3, the water outlet end of the heater 3 is connected with the water return port of the crystallization separator 1, and the circulating liquid outlet end of the crystallization separator 1 is connected with the liquid inlet end of the heater 3 through a circulating pump 21. A compressor 18 is arranged on a pipeline between the steam outlet of the crystallization separator 1 and the steam inlet of the heater 3.
The utility model discloses well crystallization separator 1, heater 3, circulating pump 21, compressor 18 etc. constitute MVR forced circulation. The utility model discloses in sink lithium mother liquor by the steam heating of shell side in heater 3's tube side, the temperature risees, sinks lithium mother liquor at circulating pump 21 effect and rises to crystal separator 1 in, owing to sink lithium mother liquor static pressure and descend the messenger to sink lithium mother liquor and take place the evaporation in crystal separator 1. The secondary steam generated by evaporation overflows from the lithium deposition mother liquor, the lithium deposition mother liquor is concentrated to generate supersaturation so as to enable crystals to grow, the supersaturation-removed lithium deposition mother liquor enters a forced circulation pump 21 and enters a heater 3 under the action of the forced circulation pump 21, and the lithium deposition mother liquor is circulated in such a way to be continuously evaporated, concentrated or concentrated and crystallized. Obtaining sodium chloride crystal slurry; and the crystal mush is output and conveyed by a crystal mush pump. The secondary steam in the crystallization separator 1 is purified by a separation and defoaming device at the upper part of the crystallization separator 1 and then is conveyed to a compressor 18, and the compressor 18 compresses the secondary steam and then conveys the compressed secondary steam to the shell side of a heater 3 to be used as evaporator heating steam, thereby realizing the heat energy circulation continuous evaporation.
The crystal slurry outlet of the crystallization separator 1 is connected with the slurry inlet of the thickener 4, the crystal slurry outlet of the thickener 4 is connected with the feed inlet of the first centrifugal machine 5, sodium chloride crystal slurry is enriched through the thickener, solids are separated from low-concentration semi-finished crystal slurry by utilizing the gravity settling principle, the crystal slurry flows in from the central liquid feeding groove, and clear liquid is discharged from the periphery through the overflow port. The sediment or sediment in the thickener is collected to the center of the bottom of the thickener and is discharged through the discharge hole after being collected, thereby increasing the consistency of the material. The sodium chloride solid is then centrifuged by a first centrifuge 5. The liquid outlet of the first centrifuge 5 is connected with the feed inlet of the mother liquor tank 7, and the liquid outlet end of the mother liquor tank 7 is connected with the liquid inlet end of the crystallization separator 1 through a mother liquor pump 12. The centrifugal mother liquor enters a mother liquor tank 7 and is pumped to an evaporation system through a mother liquor pump for treatment.
The solid material outlet of the first centrifuge 5 is connected with the feed inlet of the salt washing tank 6, the liquid outlet of the thickener 4 is connected with the feed inlet of the mother liquor tank 7, the discharge end of the salt washing tank 6 is connected with the feed inlet of the second centrifuge 9 through a centrifuge feed pump 8, and the liquid outlet of the second centrifuge 9 is connected with the liquid inlet end of the salt washing tank 6. The lithium possibly carried over on the surface of the sodium chloride solid is washed and recovered, so that the recovery rate of the lithium is improved.
The washed slurry enters a second centrifuge 9 and is centrifuged to obtain a byproduct sodium chloride. The centrifugal mother liquor returns to the salt washing tank, and washing liquor in the salt washing tank is discharged to the mother liquor tank discontinuously and then returns to the evaporation system for treatment.
The utility model discloses still include saturated sodium chloride solution tank 10, the play liquid end of saturated sodium chloride solution tank 10 pass through flush pump 11 respectively with the feed liquor end of first centrifuge 5, the feed liquor end of second centrifuge 9 are connected.
The utility model discloses in the play liquid end of distilled water jar 13 is connected with the second feed liquor end of distilled water heat exchanger 15 through distilled water pump 14, heavy lithium mother liquor inlet tube 2 is connected with the first feed liquor end of distilled water heat exchanger 15, the first play liquid end of distilled water heat exchanger 15 with the end of intaking of crystal separator 1 is connected.
The utility model discloses in be equipped with first agitating unit 19 in the stiff ware 4. A second stirring device 20 is arranged in the salt washing tank 6.
The utility model discloses in circulating pump 21's play liquid end is connected with separator 22, separator 22's dense solution goes out the liquid end and is connected with dense solution jar 23 of keeping in, separator 22's play liquid end is connected with the feed liquor end of crystal separation ware 1.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The device for recovering lithium from lithium precipitating mother liquor is characterized by comprising a crystallization separator (1), wherein the water inlet end of the crystallization separator (1) is connected with a lithium precipitating mother liquor inlet pipe (2), the water outlet end of the crystallization separator (1) is connected with the water inlet end of a heater (3), the steam outlet of the crystallization separator (1) is connected with the steam inlet of the heater (3), the water outlet end of the heater (3) is connected with the water return port of the crystallization separator (1), the crystal slurry outlet of the crystallization separator (1) is connected with the slurry inlet of a thickener (4), the crystal slurry outlet of the thickener (4) is connected with the feed inlet of a first centrifuge (5), the solid material outlet of the first centrifuge (5) is connected with the feed inlet of a salt washing tank (6), the liquid outlet of the first centrifuge (5) is connected with the feed inlet of a mother liquor tank (7), the liquid outlet of the thickener (4) is connected with the feed inlet of the mother liquor tank (7), the liquid outlet of the salt washing tank (6) is connected with the feed inlet of a sodium chloride solution washing tank (10) through a sodium chloride solution pump (9), and a sodium chloride solution washing tank (10) is connected with the feed inlet of a second saturated solution washing tank (10) and a sodium chloride solution washing tank (10), and a sodium chloride solution pump (10) is connected with the feed inlet of a saturated solution washing tank (10) and a sodium chloride solution washing tank (10) and a second saturated solution tank (10) and a sodium chloride solution pump And the liquid inlet end of the second centrifugal machine (9) is connected.
2. The device for recovering lithium from lithium precipitating mother liquor according to claim 1, wherein the outlet end of the mother liquor tank (7) is connected with the inlet end of the crystallization separator (1) through a mother liquor pump (12).
3. The device for recovering lithium from lithium precipitation mother liquor according to claim 1, wherein a liquid outlet end of the heater (3) is connected with a liquid inlet end of the distilled water tank (13).
4. The device for recovering lithium from lithium precipitating mother liquor according to claim 3, wherein the outlet end of the distilled water tank (13) is connected with the second liquid inlet end of the distilled water heat exchanger (15) through a distilled water pump (14), the lithium precipitating mother liquor inlet pipe (2) is connected with the first liquid inlet end of the distilled water heat exchanger (15), and the first liquid outlet end of the distilled water heat exchanger (15) is connected with the water inlet end of the crystallization separator (1).
5. The device for recovering lithium in lithium precipitating mother liquor according to claim 4, wherein the lithium precipitating mother liquor inlet pipe (2) is connected with a liquid inlet end of a raw liquor tank (16), and a liquid outlet end of the raw liquor tank (16) is connected with a first liquid inlet end of the distilled water heat exchanger (15) through a raw liquor pump (17).
6. The device for recovering lithium in the lithium precipitation mother liquor as claimed in claim 1, characterized in that a compressor (18) is arranged on a pipeline between a steam outlet of the crystallization separator (1) and a steam inlet of the heater (3).
7. The device for recovering lithium from the lithium precipitating mother liquor according to claim 1, wherein a first stirring device (19) is arranged in the thickener (4).
8. The device for recovering lithium from the lithium precipitating mother liquor according to claim 1, wherein a second stirring device (20) is arranged in the salt washing tank (6).
9. The device for recovering lithium in lithium precipitation mother liquor according to claim 1, wherein the liquid outlet end of the circulation liquid of the crystallization separator (1) is connected with the liquid inlet end of the heater (3) through a circulation pump (21).
10. The device for recovering lithium from lithium precipitating mother liquor according to claim 9, wherein the liquid outlet end of the circulating pump (21) is connected with the separation chamber (22), the concentrated liquid outlet end of the separation chamber (22) is connected with the concentrated liquid temporary storage tank (23), and the liquid outlet end of the separation chamber (22) is connected with the liquid inlet end of the crystallization separator (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222877749.7U CN218709764U (en) | 2022-10-31 | 2022-10-31 | Device for recovering lithium from lithium precipitation mother liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222877749.7U CN218709764U (en) | 2022-10-31 | 2022-10-31 | Device for recovering lithium from lithium precipitation mother liquor |
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| Publication Number | Publication Date |
|---|---|
| CN218709764U true CN218709764U (en) | 2023-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222877749.7U Active CN218709764U (en) | 2022-10-31 | 2022-10-31 | Device for recovering lithium from lithium precipitation mother liquor |
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| CN (1) | CN218709764U (en) |
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- 2022-10-31 CN CN202222877749.7U patent/CN218709764U/en active Active
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