CN214611566U - Lithium extraction system of salt lake brine - Google Patents
Lithium extraction system of salt lake brine Download PDFInfo
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- CN214611566U CN214611566U CN202120272125.5U CN202120272125U CN214611566U CN 214611566 U CN214611566 U CN 214611566U CN 202120272125 U CN202120272125 U CN 202120272125U CN 214611566 U CN214611566 U CN 214611566U
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Abstract
The utility model provides a lithium extraction system of salt lake brine. This lithium system of carrying includes: continuous magnesium removal equipment for carrying out continuous magnesium removal treatment on the lithium-rich brine by using a sodium hydroxide solution, wherein a magnesium-removed liquid and magnesium slag are obtained in the continuous magnesium removal equipment; the continuous lithium precipitation equipment is connected with the continuous magnesium removal equipment and is used for carrying out continuous lithium precipitation treatment on the magnesium-removed liquid, and crude lithium carbonate and lithium precipitation mother liquid are obtained in the continuous lithium precipitation equipment; the continuous washing equipment is connected with the continuous lithium precipitation equipment and is used for continuously washing the crude lithium carbonate to obtain lithium carbonate solid in the continuous washing equipment; and the continuous drying equipment is connected with the continuous washing equipment and is used for drying the lithium carbonate solid, and dried lithium carbonate is obtained in the continuous drying equipment. The system achieves continuous production, obviously reduces labor intensity, and reduces product differences caused by subjective differences of manual operation, thereby improving the quality stability of products, reducing the cost and improving the batch qualification of the products.
Description
Technical Field
The utility model relates to a salt lake brine carries lithium technical field particularly, relates to a salt lake brine carries lithium system.
Background
The salt lake brine is one of the main raw materials for extracting lithium at present, accounts for 66% of the world lithium resource reserves, and the other is granite pegmatite type lithium ore. The lithium-containing salt lakes are classified into 3 types of carbonate, sulfate (sodium sulfate, magnesium sulfate, etc.) and chloride, which are distributed very unevenly, mainly in south america andes (argentina, bolivia, chile), chinese tibetan plateau and north america, nevada.
The magnesium-lithium ratio of foreign salt lake is low, the lithium can be extracted by precipitation method, the relative process technology is simple, and the product quality is stable. However, the Mg/Li ratio of the lithium-rich salt lake brine in China is higher and far higher than 8.0 of the Wuliya oolong salt lake, the difficulty of lithium extraction technology is high, and the cost is high, which is one of the reasons that the yield of the salt lake brine in China cannot be improved in recent years and the product quality cannot meet the requirement.
Because of different components, Mg/Li ratio and the like, lithium carbonate is generally industrially produced from lithium-rich brine by adopting different process routes such as a membrane separation method, a calcination method, an adsorption method and the like. In addition, enterprises adopt a process route of a gradient solar pond and a causticization process or a process route of a halogen exchange method and a causticization method. At present, domestic salt lake lithium extraction enterprises are basically 'one lake one process'. Among the above-mentioned resources in China, the enterprises implementing mass production are mainly located in Qinghai Chauda, while those in the Chauda basin adopt different production processes from low-concentration Li+High concentration of Mg2+Preparing the brine containing higher-concentration Li from the initial salt lake+Low concentration of Mg2+The lithium-rich brine is used for lithium precipitation discontinuous production through a discontinuous process, manual operation is mainly used, a large amount of labor input is needed, the subjective operation difference of different personnel and different periods is particularly large,the product quality is unstable, and the product quality in the salt lake area is always low.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a lithium system of carrying of salt lake brine to solve the unstable problem of product quality that the technique of carrying lithium in the salt lake among the prior art obtained.
In order to achieve the above object, according to an aspect of the present invention, there is provided a lithium extraction system for salt lake brine, comprising: continuous magnesium removal equipment for carrying out continuous magnesium removal treatment on the lithium-rich brine by using a sodium hydroxide solution, wherein a magnesium-removed liquid and magnesium slag are obtained in the continuous magnesium removal equipment; the continuous lithium precipitation equipment is connected with the continuous magnesium removal equipment and is used for carrying out continuous lithium precipitation treatment on the magnesium-removed liquid, and crude lithium carbonate and lithium precipitation mother liquid are obtained in the continuous lithium precipitation equipment; the continuous washing equipment is connected with the continuous lithium precipitation equipment and is used for continuously washing the crude lithium carbonate to obtain lithium carbonate solid in the continuous washing equipment; and the continuous drying equipment is connected with the continuous washing equipment and is used for drying the lithium carbonate solid, and dried lithium carbonate is obtained in the continuous drying equipment.
Further, the continuous magnesium removing apparatus comprises: the continuous magnesium settling device is used for carrying out continuous magnesium removal treatment on the lithium-rich brine by adopting a sodium hydroxide solution to obtain first slurry; the first continuous sedimentation device is connected with the continuous magnesium sedimentation device and is used for carrying out first solid-liquid separation on the first slurry to obtain a first underflow and a first overflow liquid; and the continuous solid-liquid separation device is connected with the first continuous sedimentation device and is used for carrying out first continuous solid-liquid separation on the first bottom flow to obtain magnesium slag and magnesium-removed liquid.
Further, the continuous magnesium precipitation device comprises at least one continuous magnesium precipitation tank.
Further, the continuous magnesium precipitation device comprises two to five continuous magnesium precipitation tanks connected in series.
Further, the continuous solid-liquid separation device comprises a first continuous filter and a first continuous fine filter which are connected in sequence.
Further, the first continuous settling device is provided with an impurity removing agent feeder.
Further, the above-mentioned continuous lithium deposition apparatus includes: the continuous lithium precipitation device is used for carrying out continuous lithium precipitation treatment on the magnesium-removed liquid by adopting a sodium carbonate solution to obtain second slurry; the second continuous sedimentation device is connected with the continuous lithium sedimentation device and is used for carrying out second solid-liquid separation on the second slurry to obtain a second underflow and a second overflow liquid; and the second continuous filter is connected with the second continuous sedimentation device and is used for carrying out second continuous solid-liquid separation on the second bottom flow to obtain crude lithium carbonate and a lithium sedimentation mother solution.
Further, the above-mentioned continuous lithium deposition apparatus further includes: and the second continuous fine filter is respectively connected with the second continuous filter and the second continuous sedimentation device and is used for carrying out third continuous solid-liquid separation on the second overflow liquid and the lithium precipitation mother liquid to obtain fine filter liquid and fine filter residues.
Furthermore, the second continuous fine filter and the continuous lithium precipitation device and/or the second continuous precipitation device form a circulation loop for returning fine filter residues to the continuous lithium precipitation device and/or the second continuous precipitation device.
Further, the continuous lithium deposition device comprises at least one continuous lithium deposition groove.
Further, the continuous lithium depositing device comprises two to five continuous lithium depositing tanks connected in series.
Further, the above continuous washing apparatus includes: the continuous washing device is used for continuously washing the crude lithium carbonate to obtain a third underflow and a third overflow liquid; and the third continuous filter is connected with the continuous washing device and is used for carrying out fourth continuous solid-liquid separation on the third underflow to obtain lithium carbonate solid.
Further, the above continuous washing apparatus further comprises: and the third continuous fine filter is respectively connected with the inlet and the outlet of the continuous washing device and is used for carrying out fifth continuous solid-liquid separation on the third overflow liquid to obtain fine filter water and returning the fine filter water to the preparation process of the sodium carbonate solution.
Further, the continuous washing apparatus includes at least one continuous washing tank.
Further, the continuous washing device comprises two to five continuous washing tanks connected in series.
Further, the continuous magnesium precipitation tank comprises an atomization device which is used for spraying the sodium hydroxide solution into the continuous magnesium precipitation tank.
Furthermore, the lithium extraction system also comprises a buffer, wherein the buffer homogenizer is a buffer homogenizing pool or a buffer homogenizing storage tank, and the buffer homogenizer is connected with the continuous magnesium removal equipment and used for naturally settling the lithium-rich brine to achieve the purpose of buffer homogenizing treatment.
Use the technical scheme of the utility model, this application adopts the lithium system of carrying of salt lake brine, and this system is including the continuous magnesium equipment that removes that connects gradually, sinks lithium equipment, continuous washing equipment and continuous drying equipment in succession. The integrated lithium extraction system can achieve continuous production, so that the labor intensity is obviously reduced, the product difference caused by manual control subjective distinction is reduced, the quality stability of products is improved, the product cost is reduced, and the batch qualification of the products is improved.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic diagram of a lithium extraction system of salt lake brine provided in example 1 of the present invention.
Wherein the figures include the following reference numerals:
01. continuous magnesium removal equipment; 02. continuous lithium deposition equipment; 03. continuous washing equipment; 04. a continuous drying device; 05. a buffer homogenizer; 011. a continuous magnesium precipitation device; 012. a first continuous settling device; 013. a first continuous filter; 014. a first continuous fine filter; 015. a continuous magnesium precipitation tank; 021. a continuous lithium deposition device; 022. a second continuous settling device; 023. a second continuous filter; 024. a second continuous fine filter; 025. continuously precipitating a lithium tank; 031. a continuous washing device; 032. a third continuous filter; 033. a third continuous fine filter; 034. the tank is continuously washed.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
If the utility model discloses the background art is analyzed, prior art has the unstable problem of product quality that the lithium technique obtained of salt lake lift, in order to solve this problem, the utility model provides a lithium system is carried to salt lake brine.
In an exemplary embodiment of the present application, there is provided a lithium extraction system for salt lake brine, as shown in fig. 1, the lithium extraction system comprising: the continuous magnesium removal equipment 01 is used for carrying out continuous magnesium removal treatment on the lithium-rich brine by adopting a sodium hydroxide solution, and magnesium-removed liquid and magnesium slag are obtained in the continuous magnesium removal equipment 01; the continuous lithium precipitation equipment 02 is connected with the continuous magnesium removal equipment 01 and is used for carrying out continuous lithium precipitation treatment on the magnesium-removed liquid, and crude lithium carbonate and lithium precipitation mother liquid are obtained in the continuous lithium precipitation equipment 02; the continuous washing equipment 03 is connected with the continuous lithium precipitation equipment 02 and is used for continuously washing the crude lithium carbonate, and lithium carbonate solid is obtained in the continuous washing equipment 03; and a continuous drying device 04 connected with the continuous washing device 03 and used for drying the lithium carbonate solid, wherein dried lithium carbonate is obtained in the continuous drying device 04.
This application adopts the lithium system of carrying of salt lake brine, and this system is including the continuous magnesium equipment 01 that removes, the lithium equipment 02 that sinks in succession, continuous washing equipment 03 and continuous drying equipment 04 that connect gradually. The integrated lithium extraction system can achieve continuous production, so that the labor intensity is obviously reduced, the product difference caused by manual control subjective distinction is reduced, the quality stability of products is improved, the product cost is reduced, and the batch qualification of the products is improved.
In one embodiment of the present application, as shown in fig. 1, the continuous magnesium removal apparatus 01 includes: the continuous magnesium settling device 011 is used for carrying out continuous magnesium removal treatment on the lithium-rich brine by adopting a sodium hydroxide solution to obtain first slurry; the first continuous sedimentation device 012 is connected with the continuous magnesium sedimentation device 011 and is used for carrying out first solid-liquid separation on the first slurry to obtain a first underflow and a first overflow liquid; and a continuous solid-liquid separation device connected to the first continuous sedimentation device 012, for performing a first continuous solid-liquid separation on the first underflow to obtain magnesium slag and a magnesium-removed liquid.
With reference to the schematic diagram of the lithium extraction system of the salt lake brine shown in fig. 1, it can be seen that in the continuous magnesium removal equipment 01, continuous magnesium removal treatment, first solid-liquid separation and first continuous solid-liquid separation are sequentially performed in the continuous magnesium precipitation device 011, the first continuous precipitation device 012 and the continuous solid-liquid separation device which are sequentially connected, so that the purpose of continuous magnesium removal of the lithium-rich brine is achieved, the influence of human factors is avoided, and the quality stability of the magnesium-removed solution is improved.
In order to meet the treatment requirements of lithium-rich brine with different contents and improve the efficiency of continuous magnesium removal treatment, as shown in fig. 1, the continuous magnesium precipitation device 011 preferably comprises at least one continuous magnesium precipitation tank 015.
In one embodiment of the present application, in order to balance the efficiency of the continuous magnesium removal process and the equipment cost, it is preferable that the continuous magnesium deposition apparatus 011 includes two to five continuous magnesium deposition tanks 015 connected in series as shown in fig. 1.
In one embodiment of the present application, as shown in fig. 1, the continuous solid-liquid separation apparatus comprises a first continuous filter 013 and a first continuous fine filter 014 connected in series.
The first continuous filter 013 and the first continuous fine filter 014 may perform first continuous filtration and first continuous fine filtration on the first slurry, thereby improving the separation effect of the first slurry.
In order to further assist the first continuous fine filtration process and thus improve the effect of the first continuous fine filtration, the first continuous sedimentation device 012 is preferably provided with an impurity removing agent feeder.
In an embodiment of the present application, as shown in fig. 1, the continuous lithium deposition apparatus 02 includes: a continuous lithium deposition device 021, configured to perform continuous lithium deposition on the magnesium-removed solution with a sodium carbonate solution to obtain a second slurry; the second continuous settling device 022 is connected with the continuous lithium settling device 021 and is used for carrying out second solid-liquid separation on the second slurry to obtain a second underflow and a second overflow liquid; and a second continuous filter 023 connected to the second continuous settling device 022 for performing a second continuous solid-liquid separation on the second underflow to obtain crude lithium carbonate and a lithium-settling mother liquor.
By combining the schematic diagram of the lithium extraction system of the salt lake brine shown in fig. 1, it can be seen that the first continuous fine filter 014, the continuous lithium precipitation device 021, the second continuous precipitation device 022 and the second continuous filter 023 in the continuous magnesium removal equipment 01 are sequentially connected, so that the magnesium-removed liquid obtained in the continuous magnesium removal equipment 01 can be subjected to continuous lithium precipitation treatment to obtain crude lithium carbonate, the influence of human factors is avoided, and the quality stability of the crude lithium carbonate is improved.
In order to realize continuous processing of the second slurry, as shown in fig. 1, the continuous lithium deposition apparatus 02 preferably further includes: and a second continuous fine filter 024 connected with the second continuous filter 023 and the second continuous sedimentation device 022 respectively and used for carrying out third continuous solid-liquid separation on the second overflow liquid and the lithium precipitation mother liquid to obtain fine filter liquor and fine filter residue.
In order to further improve the recovery rate of lithium in the lithium precipitation mother liquor, reduce the work load of waste recovery and reduce the production cost. Preferably, the second continuous fine filter 024 and the continuous lithium deposition device 021 and/or the second continuous deposition device 022 form a circulation loop for returning fine filter residue to the continuous lithium deposition device 021 and/or the second continuous deposition device 022.
To expand the universality of the continuous lithium deposition apparatus 021, it is preferable that the continuous lithium deposition apparatus 021 includes at least one continuous lithium deposition tank 025, as shown in fig. 1.
In one embodiment of the present application, as shown in fig. 1, the continuous lithium deposition apparatus 021 includes two to five continuous lithium deposition tanks 025 connected in series.
Two to five continuous lithium precipitation tanks 025 connected in series can more fully carry out continuous lithium precipitation treatment on the magnesium-removed liquid, and can increase the treatment capacity of the magnesium-removed liquid according to actual needs.
Further, as shown in fig. 1, a pump is preferably provided between the continuous lithium precipitation tank 025 and the second continuous precipitation device 022 so as to pump the second slurry into the second continuous precipitation device 022. Preferably, a temperature-controlled stirrer is arranged in the second continuous settling device 022 to regulate the second solid-liquid separation process. It is preferable to provide a mechanical stirrer in the continuous magnesium precipitation bath 015 to assist in the efficient performance of the continuous lithium precipitation process.
In an embodiment of the present application, as shown in fig. 1, the above-mentioned continuous washing apparatus 03 includes: a continuous washing device 031, which continuously washes the coarse lithium carbonate to obtain a third underflow and a third overflow liquid; and the third continuous filter 032 is connected to the continuous washing device 031, and is configured to perform a fourth continuous solid-liquid separation on the third underflow, so as to obtain a lithium carbonate solid.
With reference to the schematic diagram of the lithium extraction system of the salt lake brine shown in fig. 1, it can be seen that the second continuous filter 023 of the continuous lithium deposition device 02 is connected to the continuous washing device 031 of the continuous washing device 03, and the continuous washing device 031 and the third continuous filter 032 are sequentially connected, so that the continuous washing treatment of the coarse lithium carbonate is realized, the lithium carbonate solid is obtained, and the difference in lithium carbonate solids caused by the subjective difference of manual operation and control is reduced.
In order to realize solid-liquid separation of the third overflow liquid, as shown in fig. 1, the continuous washing apparatus 03 preferably further includes: and a third continuous fine filter 033 connected to an inlet and an outlet of the continuous washing device 031, respectively, for performing a fifth continuous solid-liquid separation on the third overflow liquid to obtain a fine filter water, and returning the fine filter water to the preparation process of the sodium carbonate solution.
In one embodiment of the present application, as shown in fig. 1, the continuous washing device 031 comprises at least one continuous washing tank 034.
The arrangement of at least one continuous washing tank 034 can adjust the number of the continuous washing tanks 034 according to actual needs, thereby improving the universality of the lithium extraction system.
In order to achieve both the efficiency of the continuous washing process and the equipment cost, it is preferable that the continuous washing apparatus 031 include two to five continuous washing tanks 034 connected in series, as shown in fig. 1.
To further contact the sodium hydroxide solution with the lithium-rich brine more sufficiently to improve the efficiency of the continuous magnesium removal process, it is preferable that the continuous magnesium precipitation bath 015 includes an atomizing device for spraying the sodium hydroxide solution into the continuous magnesium precipitation bath 015.
In an embodiment of the present application, as shown in fig. 1, the lithium extraction system further includes a buffer homogenizer 05, the buffer homogenizer 05 is a buffer homogenizing tank or a buffer homogenizing storage tank, and the buffer homogenizer 05 is connected to the continuous magnesium removal equipment 01 for naturally settling the lithium-rich brine for the purpose of buffer homogenizing.
The buffer homogenizing tank or the buffer homogenizing storage tank is used for storing the lithium-rich brine (raw material for producing lithium salt, Li)+>15g/L), the storage period can be properly prolonged or the storage capacity can be increased according to the stable supply capacity and the investment condition of the lithium-rich brine raw material. In order to further avoid secondary pollution to the lithium-rich brine, the buffer homogenizer 05 is preferably a closed buffer homogenizing tank or a closed buffer homogenizing storage tank; in order to prolong the residence time of the lithium-rich brine, a flow guide weir is preferably arranged in the buffer homogenizer to achieve the purposes of naturally settling micro-solid, homogenizing and stabilizing the latter-stage production; further, it is preferred that the bottom of the buffer homogenizer has a slope to allow for periodic cleaning of the trace solids in the lithium-rich brine.
In another exemplary embodiment of the present application, there is provided a method for extracting lithium from salt lake brine, the method comprising: step S1, carrying out continuous magnesium removal treatment on the lithium-rich brine by using a sodium hydroxide solution to obtain a magnesium-removed liquid and magnesium slag; step S2, continuously precipitating lithium from the magnesium-removed solution to obtain crude lithium carbonate and a lithium precipitation mother solution; and step S3, continuously washing the crude lithium carbonate to obtain solid lithium carbonate.
The lithium extraction method of the salt lake brine is adopted, and comprises continuous magnesium removal treatment, continuous lithium precipitation treatment and continuous washing treatment which are sequentially carried out on the lithium-rich brine, so that continuous production of lithium extraction of the salt lake brine is realized, the labor intensity is obviously reduced, product differences caused by subjective differences of manual operation and control are reduced, the quality stability of products is further improved, the product cost is reduced, and the batch qualification of lithium carbonate products is improved.
In an embodiment of the present application, the step S1 includes: step S11, carrying out continuous magnesium removal treatment on the lithium-rich brine by using a sodium hydroxide solution to obtain first slurry; step S12, carrying out first settling separation on the first slurry to obtain a first underflow and a first overflow liquid; and step S13, the first bottom flow is carried out the first continuous solid-liquid separation to obtain magnesium slag and magnesium-removed liquid, preferably step S13 comprises: and sequentially carrying out first continuous filtration and first continuous fine filtration on the first bottom flow to obtain magnesium slag and a magnesium-removed liquid, preferably adding an impurity removing agent in the process of the first continuous filtration, preferably returning the magnesium slag to the continuous magnesium removal treatment, preferably spraying a sodium hydroxide solution into the lithium-rich brine in a spraying manner, preferably carrying out buffer homogenization treatment on the lithium-rich brine before step S11, and preferably adding a flocculating agent and a filter aid in the process of the first sedimentation separation.
The above step S1 of the present application can realize continuous magnesium removal treatment of the lithium-rich brine, and obtain a magnesium-removed solution with stable quality. The above-mentioned buffer homogenization treatment of lithium-rich brine can make the trace solid in the lithium-rich brine naturally settle, so that the goal of homogenization and stable later-stage production can be achieved. Adding a flocculating agent (such as 100-250 mg/kg of anionic polyacrylamide) and a filter aid (such as diatomite) in the first solid-liquid separation process, preferably adding an impurity removing agent in the first continuous solid-liquid separation process, which is favorable for reducing the impurity content in the magnesium-removed liquid, preferably returning the magnesium slag to the continuous magnesium removal treatment as seed crystals, which is favorable for causing the magnesium hydroxide to precipitate on the surface of the seed crystals to grow up to form the aggregated magnesium hydroxide slag with a certain particle size. The sodium hydroxide solution (30-40 wt%) is preferably sprayed into the lithium-rich brine in a mist-like flow-controllable manner, so that the sodium hydroxide solution and the lithium-rich brine can be mixed more sufficiently, and the efficiency of continuous magnesium removal treatment is improved. Of course, the process of continuous magnesium removal treatment on lithium-rich brine can also refer to the prior art by those skilled in the art, and is not described herein again.
In an embodiment of the present application, the step S2 includes: step S21, adopting a sodium carbonate solution to carry out continuous lithium precipitation treatment on the magnesium-removed solution to obtain a second slurry; preferably, the temperature of the continuous lithium deposition treatment is 90-95 ℃; step S22, carrying out second settling separation on the second slurry to obtain a second underflow and a second overflow liquid; and step S23, performing second continuous solid-liquid separation on the second bottom flow to obtain crude lithium carbonate and lithium precipitation mother liquor, wherein the second continuous solid-liquid separation is continuous filtration, and optionally performing second continuous fine filtration on the second overflow liquid and the lithium precipitation mother liquor to obtain fine filtration liquid and fine filtration slag; optionally, lithium in the fine filtration liquid and the lithium precipitation mother liquid is recovered, and optionally, the fine filtration residue is returned to the second precipitation separation and/or the second precipitation separation.
The step S2 can achieve the purpose of obtaining crude lithium carbonate through the continuous lithium deposition treatment of the magnesium-removed solution. In order to improve the precipitation efficiency of lithium carbonate, the temperature for continuous lithium precipitation treatment is preferably 90-95 ℃, and the fine filtration slag is returned for recycling, so that the waste utilization rate can be further improved, and the cost is reduced. The process of the continuous lithium deposition treatment of the magnesium-removed solution by the sodium carbonate solution can refer to the prior art, and is not repeated herein.
In order to further increase the purity of lithium carbonate, it is preferable that step S3 includes: step S31, continuously washing the crude lithium carbonate by using water to obtain a third underflow and a third overflow liquid; and step S32, performing third continuous solid-liquid separation on the third bottom flow to obtain lithium carbonate solid, preferably performing continuous filtration on the third continuous solid-liquid separation, optionally performing third continuous fine filtration on the third overflow liquid to obtain fine filtered water, and optionally returning the fine filtered water to the preparation process of the sodium carbonate solution, so that the recycling of the fine filtered water and the recovery of lithium are realized, the water consumption is reduced, and the cost is reduced, wherein in order to balance the washing effect and the water consumption, the liquid-solid ratio of water to crude lithium carbonate is preferably 3-7: 1.
In an embodiment of the present application, the lithium extraction method further includes drying the lithium carbonate solid to obtain dried lithium carbonate; and packaging the dried lithium carbonate to obtain a lithium carbonate product.
And drying and packaging the lithium carbonate solid obtained after washing and purification are carried out, so that the product difference caused by manual control subjective distinction can be avoided from beginning to end, the quality stability of the product is further improved, and the batch qualification of the lithium carbonate product is improved.
The following description will explain advantageous effects of the present application with reference to specific examples.
The following examples refer to the lithium extraction system shown in fig. 1 and the above-mentioned method for extracting lithium from salt lake brine, and perform lithium extraction on lithium-rich brine.
The following description will explain advantageous effects of the present application with reference to specific examples.
Example 1
The lithium-rich brine (Li) is naturally settled and homogenized in a buffer homogenizer 05 and stored for a certain period of time+>15g/L), the composition of the lithium-rich brine is shown in Table 1, the lithium-rich brine is subjected to continuous magnesium removal treatment in continuous magnesium removal equipment 01, specifically, the lithium-rich brine subjected to buffer homogenization treatment and 30 wt% of sodium hydroxide solution (sprayed into a continuous magnesium precipitation tank in a mist-like flow-controllable manner) are subjected to continuous magnesium removal treatment (at the temperature of 95 ℃) in three continuous magnesium precipitation tanks 015 of a continuous magnesium precipitation device 011, so that a first slurry is obtained; pumping the first slurry into a first continuous sedimentation device 012 to perform first sedimentation separation (200 mg/kg of anionic polyacrylamide and diatomite are added, wherein the addition amount of the diatomite is 0.5-1% of the amount of the slag), so as to obtain a first underflow and a first overflow liquid; subjecting the first underflow to a first continuous solid-liquid separation: the first underflow is continuously filtered in a first continuous filter 013 to obtain a magnesium-removing solution and magnesium slag, the first overflow liquid and the magnesium-removing solution are continuously fine-filtered in a first continuous fine filter 014 to obtain a magnesium-removed liquid and magnesium slag, and the two magnesium slag can be used as crystal seeds to return to the step of continuously removing magnesium.
TABLE 1
| Element(s) | Li+ | Mg2+ | Cl- | Na+ |
| Concentration (g/L) | 15～20 | 8 | 100 | 1.9 |
Continuously removing magnesium from the magnesium-removed liquid in a continuous lithium precipitation device 02, specifically, continuously precipitating lithium from the magnesium-removed liquid and 20-25 wt% of sodium carbonate solution in three continuous lithium precipitation tanks 025(2205 material) of a continuous lithium precipitation device 021 to obtain a second slurry; pumping the second slurry into a second continuous settling device 022 for second settling separation to obtain a second underflow and a second overflow liquid; performing second continuous solid-liquid separation on the second underflow in a second continuous filter 023 to obtain crude lithium carbonate and a lithium precipitation mother solution; performing second continuous fine filtration on the second overflow liquid and the lithium precipitation mother liquor in a second continuous fine filter 024 to obtain fine filtrate and fine filtration residues; and returning the fine filtration slag to the second sedimentation separation.
Performing continuous washing treatment on the crude lithium carbonate in a continuous washing device 03, specifically, performing continuous washing treatment on the crude lithium carbonate in three continuous washing tanks 034 of a continuous washing device 031 by using water (the temperature is 95 ℃, the volume ratio of water to the crude lithium carbonate is 7:1, and performing 3 times of counter-current washing) to obtain a third underflow and a third overflow; performing third continuous solid-liquid separation on the third bottom flow in a third continuous filter 032 to obtain a lithium carbonate solid; and (3) performing third continuous fine filtration on the third overflow liquid in a third continuous fine filter 033 to obtain fine filtered water, and returning the fine filtered water to the preparation process of the sodium carbonate solution.
And drying the lithium carbonate solid in the continuous drying equipment 04 to obtain dry lithium carbonate, and packaging the dry carbonic acid to finally obtain a lithium carbonate product.
The whole lithium extraction process flow can be continuously controlled remotely through a DCS system, manual field operation is not needed, and the quality of the lithium carbonate product is randomly detected, so that the obtained lithium carbonate product is stable in quality and qualified in batch.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:
this application adopts the lithium system of carrying of salt lake brine, and this system is including the continuous magnesium equipment that removes, the lithium equipment that sinks in succession, continuous washing equipment and continuous drying equipment that connect gradually. The integrated lithium extraction system can achieve continuous production, so that the labor intensity is obviously reduced, the product difference caused by manual control subjective distinction is reduced, the quality stability of products is improved, the product cost is reduced, and the batch qualification of the products is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (17)
1. A lithium extraction system of salt lake brine, characterized in that, the lithium extraction system includes:
the continuous magnesium removal equipment (01) is used for carrying out continuous magnesium removal treatment on the lithium-rich brine by adopting a sodium hydroxide solution, and a magnesium-removed liquid and magnesium slag are obtained in the continuous magnesium removal equipment (01);
the continuous lithium precipitation equipment (02) is connected with the continuous magnesium removal equipment (01) and is used for carrying out continuous lithium precipitation treatment on the magnesium-removed liquid, and crude lithium carbonate and lithium precipitation mother liquid are obtained in the continuous lithium precipitation equipment (02);
the continuous washing device (03) is connected with the continuous lithium depositing device (02) and is used for continuously washing the crude lithium carbonate, and lithium carbonate solid is obtained in the continuous washing device (03); and
and the continuous drying device (04) is connected with the continuous washing device (03) and is used for drying the lithium carbonate solid, and dried lithium carbonate is obtained in the continuous drying device (04).
2. The lithium extraction system according to claim 1, characterized in that the continuous magnesium removal device (01) comprises:
a continuous magnesium deposition device (011) for carrying out continuous magnesium removal treatment on the lithium-rich brine by adopting the sodium hydroxide solution to obtain a first slurry;
the first continuous sedimentation device (012) is connected with the continuous magnesium sedimentation device (011) and is used for carrying out first solid-liquid separation on the first slurry to obtain a first underflow and a first overflow liquid; and
and the continuous solid-liquid separation device is connected with the first continuous sedimentation device (012) and is used for carrying out first continuous solid-liquid separation on the first underflow to obtain the magnesium slag and the magnesium-removed liquid.
3. The lithium extraction system according to claim 2, wherein the continuous magnesium deposition device (011) comprises at least one continuous magnesium deposition bath (015).
4. A lithium extraction system according to claim 3, characterized in that the continuous magnesium precipitation device (011) comprises two to five of the continuous magnesium precipitation tanks (015) connected in series.
5. The lithium extraction system of claim 2, wherein the continuous solid-liquid separation device comprises a first continuous filter (013) and a first continuous fine filter (014) arranged in series.
6. The lithium extraction system according to claim 5, characterized in that the first continuous sedimentation device (012) is equipped with a scavenger feeder.
7. The lithium extraction system according to claim 1 or 2, characterized in that the continuous lithium deposition device (02) comprises:
a continuous lithium deposition device (021) for performing the continuous lithium deposition treatment on the magnesium-removed liquid by adopting a sodium carbonate solution to obtain second slurry;
the second continuous settling device (022) is connected with the continuous lithium settling device (021) and is used for carrying out second solid-liquid separation on the second slurry to obtain a second underflow and a second overflow liquid; and
and the second continuous filter (023) is connected with the second continuous sedimentation device (022) and is used for carrying out second continuous solid-liquid separation on the second bottom flow to obtain the crude lithium carbonate and the lithium sedimentation mother liquor.
8. The lithium extraction system according to claim 7, wherein the continuous lithium deposition apparatus (02) further comprises:
and the second continuous fine filter (024) is respectively connected with the second continuous filter (023) and the second continuous sedimentation device (022) and is used for carrying out third continuous solid-liquid separation on the second overflow liquid and the lithium precipitation mother liquid to obtain fine filter liquid and fine filter residue.
9. The lithium extraction system according to claim 8, wherein the second continuous fine filter (024) constitutes a circulation loop with the continuous lithium deposition device (021) and/or the second continuous deposition device (022) for returning the fine filter residue to the continuous lithium deposition device (021) and/or the second continuous deposition device (022).
10. The lithium extraction system according to claim 7, characterized in that the continuous lithium deposition device (021) comprises at least one continuous lithium deposition tank (025).
11. The lithium extraction system according to claim 10, characterized in that the continuous lithium deposition device (021) comprises two to five continuous lithium deposition tanks (025) connected in series.
12. The lithium extraction system according to claim 7, characterized in that the continuous washing device (03) comprises:
a continuous washing device (031) for performing the continuous washing treatment on the crude lithium carbonate to obtain a third underflow and a third overflow liquid;
and the third continuous filter (032) is connected with the continuous washing device (031) and is used for carrying out fourth continuous solid-liquid separation on the third underflow to obtain the lithium carbonate solid.
13. The lithium extraction system according to claim 12, characterized in that the continuous washing device (03) further comprises: and a third continuous fine filter (033) which is respectively connected with an inlet and an outlet of the continuous washing device (031) and used for carrying out fifth continuous solid-liquid separation on the third overflow liquid to obtain fine filter water, and returning the fine filter water to the preparation process of the sodium carbonate solution.
14. The lithium extraction system according to claim 13, wherein the continuous washing device (031) comprises at least one continuous washing tank (034).
15. The lithium extraction system according to claim 14, characterized in that the continuous washing device (031) comprises two to five of the continuous washing tanks (034) in series.
16. A lithium extraction system according to claim 3 or 4, characterized in that the continuous magnesium precipitation bath (015) comprises an atomization device for spraying the sodium hydroxide solution into the continuous magnesium precipitation bath (015).
17. The lithium extraction system according to claim 1, further comprising a buffer homogenizer (05), wherein the buffer homogenizer (05) is a buffer homogenizing tank or a buffer homogenizing storage tank, and the buffer homogenizer (05) is connected with the continuous magnesium removal equipment (01) and is used for naturally settling the lithium-rich brine for the purpose of buffer homogenizing.
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