System device for recovering lithium and boron resources in salt lake brine

Abstract

The utility model provides a system device for recovering lithium and boron resources in salt lake brine. The system device comprises a pretreatment unit, a boron removal unit and a lithium precipitation unit, the boron removal unit comprises an ion exchange resin boron removal device, a regenerated liquid storage device, a transformation liquid storage device, a boron and lithium recovery container, an electrodialysis device and a boron extraction device; a feed port of the ion exchange resin boron removal device is connected with a feed liquid outlet end of the pretreatment unit, a discharge port of the ion exchange resin boron removal device is connected with a liquid inlet end of the lithium precipitation unit, and a regenerated liquid inlet and a transformation liquid inlet are respectively connected with the regenerated liquid storage device and the transformation liquid storage device; the boron-lithium recovery liquid outlet is sequentially connected with the boron-lithium recovery container and the electrodialysis device along the flow direction of the boron-lithium recovery liquid; the electrodialysis device is provided with a concentrated water outlet and a fresh water outlet, the concentrated water outlet is connected with the concentrated water inlet end of the pretreatment unit, and the fresh water outlet is connected with the inlet of the boron extraction device. According to the device, boron ions and residual lithium ions in the ion exchange resin after boron removal can be effectively recovered.

Description

Technical Field

[0001] The utility model belongs to the technical field of salt lake resource recovery and relates to a lithium-boron resource recovery system device in salt lake brine. Background Art

[0002] Lithium extraction from salt lake brine refers to the process of extracting lithium from lithium-containing salt lake brine. Domestic salt lake brine has abundant lithium resources, and lithium extraction from salt lakes has obvious resource and cost advantages. Therefore, extracting lithium from salt lakes has become an inevitable trend in the development of lithium resources.

[0003] In the existing salt lake brine lithium extraction process, ion exchange resin boron removal devices are often used for boron removal. After boron removal, the ion exchange resin contains boron ions and residual lithium ions. If these are not recovered, a large loss of boron and lithium will occur.

[0004] Therefore, there is an urgent need to provide a device that can recover boron ions and residual lithium ions in ion exchange resins. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a lithium-boron resource recovery system device in salt lake brine. The lithium-boron resource recovery system device in salt lake brine provided by the utility model can effectively extract lithium resources in salt lake brine, and can effectively recover boron ions and residual lithium ions in ion exchange resin after boron removal, thereby realizing comprehensive recovery of lithium-boron resources in salt lake brine.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a lithium-boron resource recovery system device in salt lake brine, the lithium-boron resource recovery system device in salt lake brine comprises a pre-treatment unit, a boron removal unit and a lithium precipitation unit;

[0008] The boron removal unit comprises an ion exchange resin boron removal device, a regeneration liquid storage device, a transformation liquid storage device, a boron-lithium recovery container, an electrodialysis device and a boron extraction device;

[0009] The ion exchange resin deboronization device is provided with a feed inlet, a discharge port, a regeneration liquid inlet, a transformation liquid inlet and a boron-lithium recovery liquid outlet, the feed inlet is connected to the feed liquid outlet end of the pre-treatment unit, the discharge port is connected to the liquid inlet end of the lithium precipitation unit, the regeneration liquid inlet and the transformation liquid inlet are respectively connected to the regeneration liquid storage device and the transformation liquid storage device, and the boron-lithium recovery liquid outlet is sequentially connected to the boron-lithium recovery container and the electrodialysis device along the flow direction of the boron-lithium recovery liquid;

[0010] The electrodialysis device has a concentrated water outlet and a fresh water outlet. The concentrated water outlet is connected to the concentrated water inlet of the pre-treatment unit, and the fresh water outlet is connected to the inlet of the boron extraction device.

[0011] The utility model provides a lithium-boron resource recovery system device in salt lake brine, wherein the salt lake brine is pre-treated by a pre-treatment unit, the treated liquid enters a boron removal unit, the boron is removed from the pre-treated liquid by an ion exchange resin boron removal device, and the liquid after the boron removal enters a lithium precipitation unit through a discharge port to recover lithium;

[0012] Wherein, in the boron removal unit, the regeneration liquid can be passed into the ion exchange resin boron removal device through the set regeneration liquid storage device, so that the boron ions and residual lithium ions in the ion exchange resin enter the regeneration liquid to obtain the regeneration liquid, and then discharged into the boron lithium recovery container through the boron lithium recovery liquid outlet; thereafter, the transformation liquid can be passed into the ion exchange resin boron removal device through the set transformation liquid storage device, so that the remaining boron ions and residual lithium ions in the ion exchange resin enter the transformation liquid to obtain the transformation liquid, and then discharged into the boron lithium recovery container through the boron lithium recovery liquid outlet; the liquid in the boron lithium recovery container enters the electrodialysis device for lithium and boron separation treatment, the concentrated water outlet corresponds to the electrodialysis concentrated water rich in lithium, and the fresh water outlet corresponds to the electrodialysis fresh water rich in boron; the lithium-rich electrodialysis concentrated water returns to the pre-treatment unit to further recover lithium resources, and the boron-rich electrodialysis fresh water enters the boron extraction device for treatment to recover boron resources;

[0013] In summary, the lithium-boron resource recovery system device in salt lake brine provided by the utility model can effectively extract lithium resources in salt lake brine, and can also effectively recover boron ions and residual lithium ions in ion exchange resin after boron removal, thereby realizing comprehensive recovery of lithium-boron resources in salt lake brine.

[0014] Preferably, the pretreatment unit comprises a de-impurity device and a reverse osmosis concentration device connected in sequence; the reverse osmosis concentration device is provided with a feed liquid inlet, a concentrate water inlet and a feed liquid outlet, the feed liquid inlet is connected to the outlet of the de-impurity device, the concentrate water inlet is connected to the concentrate water outlet of the electrodialysis device, and the feed liquid outlet is connected to the feed inlet of the ion exchange resin boron removal device.

[0015] Preferably, the impurity removal device comprises a pre-impurity remover and a nanofilter which are sequentially connected along the flow direction of the salt lake brine, and the outlet of the nanofilter is connected to the feed liquid inlet of the reverse osmosis concentration device.

[0016] Preferably, a rinse port is provided on the top of the ion exchange resin boron removal device, and the rinse port is connected to a first water inlet pipeline; a spray component is provided on the top of the inner cavity of the ion exchange resin boron removal device, and the water inlet of the spray component is connected to the rinse port.

[0017] Preferably, a backwash port is provided at the bottom of the ion exchange resin boron removal device, and the backwash port is connected to a second water inlet pipeline.

[0018] Preferably, the reverse osmosis concentration device is also provided with a reflux port; the bottom and top of the ion exchange resin boron removal device are respectively provided with a first wash liquid outlet and a second wash liquid outlet; the first wash liquid outlet and the second wash liquid outlet are both connected to the reflux port.

[0019] Preferably, the regeneration liquid storage device comprises a regeneration liquid storage container and a regeneration liquid recovery container;

[0020] The regeneration liquid inlet of the ion exchange resin boron removal device includes a first regeneration liquid inlet and a second regeneration liquid inlet; the first regeneration liquid inlet is connected to the outlet of the regeneration liquid storage container, and the second regeneration liquid inlet is connected to the outlet of the regeneration liquid recovery container;

[0021] The ion exchange resin boron removal device is also provided with a regeneration liquid outlet, and the regeneration liquid outlet is connected to the inlet of the regeneration liquid recovery container.

[0022] Preferably, the transformation liquid storage device comprises a transformation liquid storage container and a transformation liquid recovery container;

[0023] The transition liquid inlet of the ion exchange resin boron removal device includes a first transition liquid inlet and a second transition liquid inlet; the first transition liquid inlet is connected to the outlet of the transition liquid storage container, and the second transition liquid inlet is connected to the outlet of the transition liquid recovery container;

[0024] The ion exchange resin boron removal device is also provided with a transition liquid outlet, and the transition liquid outlet is connected to the inlet of the transition liquid recovery container.

[0025] Preferably, the ion exchange resin boron removal device is further provided with a discharge port, and the discharge port is connected to a discharge container.

[0026] Preferably, a pH probe is provided in the boron-lithium recovery container.

[0027] Preferably, the boron extraction device comprises a membrane concentrator and an evaporator which are connected in sequence, and the inlet of the membrane concentrator is connected to the fresh water outlet of the electrodialysis device.

[0028] Preferably, the lithium precipitation unit comprises a lithium precipitation device, and the liquid inlet of the lithium precipitation device is connected to the discharge port of the ion exchange resin boron removal device.

[0029] The system refers to an equipment system, a device system or a production device.

[0030] Compared with the prior art, the beneficial effects of the utility model are:

[0031] The utility model provides a lithium-boron resource recovery system device in salt lake brine, wherein the salt lake brine is pre-treated by a pre-treatment unit, the treated liquid enters a boron removal unit, the boron is removed from the pre-treated liquid by an ion exchange resin boron removal device, and the liquid after the boron removal enters a lithium precipitation unit through a discharge port to recover lithium;

[0032] Wherein, in the boron removal unit, the regeneration liquid can be passed into the ion exchange resin boron removal device through the set regeneration liquid storage device, so that the boron ions and residual lithium ions in the ion exchange resin enter the regeneration liquid to obtain the regeneration liquid, and then discharged into the boron lithium recovery container through the boron lithium recovery liquid outlet; thereafter, the transformation liquid can be passed into the ion exchange resin boron removal device through the set transformation liquid storage device, so that the remaining boron ions and residual lithium ions in the ion exchange resin enter the transformation liquid to obtain the transformation liquid, and then discharged into the boron lithium recovery container through the boron lithium recovery liquid outlet; the liquid in the boron lithium recovery container enters the electrodialysis device for lithium and boron separation treatment, the concentrated water outlet corresponds to the electrodialysis concentrated water rich in lithium, and the fresh water outlet corresponds to the electrodialysis fresh water rich in boron; the lithium-rich electrodialysis concentrated water returns to the pre-treatment unit to further recover lithium resources, and the boron-rich electrodialysis fresh water enters the boron extraction device for treatment to recover boron resources;

[0033] In summary, the lithium-boron resource recovery system device in salt lake brine provided by the utility model can effectively extract lithium resources in salt lake brine, and can effectively recover boron ions and residual lithium ions in ion exchange resin after boron removal, thereby realizing comprehensive recovery of lithium-boron resources in salt lake brine, with a lithium loss rate of less than 0.01% and a boron recovery rate of more than 98%. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a lithium-boron resource recovery system device in salt lake brine provided by the utility model;

[0035] Among them, 1-ion exchange resin boron removal device; 2-reverse osmosis concentration device; 3-regeneration liquid storage container; 4-transformation liquid storage container; 5-lithium precipitation device; 6-regeneration liquid recovery container; 7-transformation liquid recovery container; 8-discharge container; 9-boron and lithium recovery container; 10-electrodialysis device; 11-membrane concentrator; 12-evaporator; 13-pre-impurity remover; 14-nanofilter. DETAILED DESCRIPTION

[0036] It should be understood that, in the description of the present utility model, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0037] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0038] Those skilled in the art should understand that the present invention necessarily includes necessary pipelines, conventional valves and general pump equipment for realizing a complete process, but the above content does not constitute the main innovation of the present invention. Those skilled in the art can add layouts on their own based on the process flow and equipment structure selection, and the present invention does not make special requirements or specific limitations on this.

[0039] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0040] In a specific embodiment, the utility model provides a lithium-boron resource recovery system device in salt lake brine, the lithium-boron resource recovery system device in salt lake brine comprises a pre-treatment unit, a boron removal unit and a lithium precipitation unit;

[0041] The boron removal unit comprises an ion exchange resin boron removal device 1, a regeneration liquid storage device, a transformation liquid storage device, a boron lithium recovery container 9, an electrodialysis device 10 and a boron extraction device, such as Figure 1 As shown;

[0042] The ion exchange resin boron removal device 1 is provided with a feed port, a discharge port, a regeneration liquid inlet, a transformation liquid inlet and a boron-lithium recovery liquid outlet, wherein the feed port is connected to the feed liquid outlet end of the pre-treatment unit, the discharge port is connected to the liquid inlet end of the lithium precipitation unit, the regeneration liquid inlet and the transformation liquid inlet are respectively connected to the regeneration liquid storage device and the transformation liquid storage device, and the boron-lithium recovery liquid outlet is sequentially connected to the boron-lithium recovery container 9 and the electrodialysis device 10 along the flow direction of the boron-lithium recovery liquid;

[0043] The electrodialysis device 10 has a concentrated water outlet and a fresh water outlet. The concentrated water outlet is connected to the concentrated water inlet of the pre-treatment unit, and the fresh water outlet is connected to the inlet of the boron extraction device.

[0044] The utility model provides a lithium-boron resource recovery system device in salt lake brine, wherein the salt lake brine is pre-treated by a pre-treatment unit, and the treated liquid enters a boron removal unit, and the boron is removed from the pre-treated liquid by an ion exchange resin boron removal device 1, and the liquid after the boron removal enters a lithium precipitation unit through a discharge port to recover lithium;

[0045] Among them, in the boron removal unit, the regeneration liquid can be passed into the ion exchange resin boron removal device 1 through the set regeneration liquid storage device, so that the boron ions and residual lithium ions in the ion exchange resin enter the regeneration liquid to obtain the regeneration liquid, and then discharged into the boron lithium recovery container 9 through the boron lithium recovery liquid outlet; thereafter, the transformation liquid can be passed into the ion exchange resin boron removal device 1 through the set transformation liquid storage device, so that the remaining boron ions and residual lithium ions in the ion exchange resin enter the transformation liquid to obtain the transformation liquid, and then discharged into the boron lithium recovery container 9 through the boron lithium recovery liquid outlet; the liquid in the boron lithium recovery container 9 enters the electrodialysis device 10 for treatment to separate lithium and boron, the concentrated water outlet corresponds to the electrodialysis concentrated water rich in lithium, and the fresh water outlet corresponds to the electrodialysis fresh water rich in boron; the lithium-rich electrodialysis concentrated water returns to the pre-treatment unit to further recover lithium resources, and the boron-rich electrodialysis fresh water enters the boron extraction device for treatment to recover boron resources;

[0046] In summary, the lithium-boron resource recovery system device in salt lake brine provided by the utility model can effectively extract lithium resources in salt lake brine, and can also effectively recover boron ions and residual lithium ions in ion exchange resin after boron removal, thereby realizing comprehensive recovery of lithium-boron resources in salt lake brine.

[0047] In the present invention, the electrodialysis device 10 is required to have a lithium yield greater than 98% and a boron removal rate greater than 90%.

[0048] Furthermore, the pretreatment unit includes a de-impurity device and a reverse osmosis concentration device 2 connected in sequence; the reverse osmosis concentration device 2 is provided with a feed liquid inlet, a concentrate water inlet and a feed liquid outlet, the feed liquid inlet is connected to the outlet of the de-impurity device, the concentrate water inlet is connected to the concentrate water outlet of the electrodialysis device 10, and the feed liquid outlet is connected to the feed inlet of the ion exchange resin boron removal device 1.

[0049] Furthermore, the impurity removal device comprises a pre-impurity remover 13 and a nanofilter 14 which are sequentially connected along the flow direction of the salt lake brine, and the outlet of the nanofilter 14 is connected to the feed liquid inlet of the reverse osmosis concentration device 2 .

[0050] Furthermore, the nanofilter 14 is a calcium and magnesium removal nanofilter.

[0051] Furthermore, a rinsing port is provided at the top of the ion exchange resin boron removal device 1, and the rinsing port is connected to a first water inlet pipeline; a spray component is provided at the top of the inner cavity of the ion exchange resin boron removal device 1, and the water inlet of the spray component is connected to the rinsing port.

[0052] Those skilled in the art should understand that the spraying portion of the spraying assembly is located above the ion exchange resin.

[0053] Furthermore, a backwash port is provided at the bottom of the ion exchange resin boron removal device 1, and the backwash port is connected to a second water inlet pipeline.

[0054] Furthermore, the reverse osmosis concentration device 2 is also provided with a reflux port; the bottom and top of the ion exchange resin boron removal device 1 are respectively provided with a first wash liquid outlet and a second wash liquid outlet; the first wash liquid outlet and the second wash liquid outlet are both connected to the reflux port.

[0055] Further, the regeneration liquid storage device comprises a regeneration liquid storage container 3 and a regeneration liquid recovery container 6;

[0056] The regeneration liquid inlet of the ion exchange resin boron removal device 1 includes a first regeneration liquid inlet and a second regeneration liquid inlet; the first regeneration liquid inlet is connected to the outlet of the regeneration liquid storage container 3, and the second regeneration liquid inlet is connected to the outlet of the regeneration liquid recovery container 6;

[0057] The ion exchange resin boron removal device 1 is also provided with a regeneration liquid outlet, and the regeneration liquid outlet is connected to the inlet of the regeneration liquid recovery container 6 .

[0058] In the utility model, the regeneration liquid can be stored in the regeneration liquid storage container 3, and the regeneration liquid enters the ion exchange resin deboronization device 1 through the first regeneration liquid inlet, and the ion exchange resin after deboronization is regenerated, and the obtained regeneration liquid enters the boron lithium recovery container 9 through the boron lithium recovery liquid outlet. Then, the regenerated ion exchange resin is rinsed with water to wash away the regeneration liquid remaining in the resin, and the obtained regeneration waste liquid enters the regeneration liquid recovery container 6 through the regeneration liquid outlet, and can be returned to the ion exchange resin deboronization device 1 through the second regeneration liquid inlet, and the ion exchange resin after deboronization is pre-regenerated, and the generated pre-regeneration liquid enters the boron lithium recovery container 9 through the boron lithium recovery liquid outlet. Therefore, by setting the regeneration liquid recovery container 6 connected to the ion exchange resin deboronization device 1, the recycling of the regeneration waste liquid can be realized, the use of the regeneration liquid can be reduced, resources can be saved, costs can be reduced, and the loss of lithium ions and boron ions can be reduced.

[0059] Furthermore, the regeneration liquid in the regeneration liquid storage container 3 is an acid solution; the concentration of the acid solution is 4-6%.

[0060] In the conventional regeneration device and process, there is no device and step for acid recovery after the acid solution is used for regeneration. Compared with this, the acid consumption of the utility model is saved by more than 50%, which has obvious advantages.

[0061] Further, the transformation liquid storage device comprises a transformation liquid storage container 4 and a transformation liquid recovery container 7;

[0062] The transition liquid inlet of the ion exchange resin boron removal device 1 includes a first transition liquid inlet and a second transition liquid inlet; the first transition liquid inlet is connected to the outlet of the transition liquid storage container 4, and the second transition liquid inlet is connected to the outlet of the transition liquid recovery container 7;

[0063] The ion exchange resin boron removal device 1 is also provided with a transition liquid outlet, and the transition liquid outlet is connected to the inlet of the transition liquid recovery container 7.

[0064] In the utility model, the transformation liquid can be stored in the transformation liquid storage container 4, and the transformation liquid enters the ion exchange resin deboronization device 1 through the first transformation liquid inlet, and the regenerated ion exchange resin is transformed, and the obtained transformation liquid enters the boron lithium recovery container 9 through the boron lithium recovery liquid outlet. Then, the transformed ion exchange resin is rinsed with water to wash away the transformation liquid remaining in the resin, and the obtained transformation waste liquid enters the transformation liquid recovery container 7 through the transformation liquid outlet, and can be returned to the ion exchange resin deboronization device 1 through the second transformation liquid inlet, and the regenerated ion exchange resin is pre-transformed, and the generated pre-transformation liquid enters the boron lithium recovery container 9 through the boron lithium recovery liquid outlet. Therefore, by setting the transformation liquid recovery container 7 connected to the ion exchange resin deboronization device 1, the recycling of the transformation waste liquid can be realized, the use of the transformation liquid can be reduced, resources can be saved, costs can be reduced, and the loss of lithium ions and boron ions can be reduced. Compared with the traditional transformation process, it has obvious advantages.

[0065] Furthermore, the transformation liquid in the transformation liquid storage container 4 is an alkaline solution; the concentration of the alkaline solution is 3-5%.

[0066] In the traditional transformation device and process, after the transformation using alkaline solution, there is no device and step for alkali recovery. Compared with this, the alkali consumption of the utility model can be saved by more than 50%, which has obvious advantages.

[0067] In summary, by using the regeneration liquid storage device and transformation liquid storage device of the utility model for regeneration and transformation, at least 50% of the acid and alkali can be recovered, and lithium and boron resources in the regeneration process can be recovered simultaneously, thereby saving production costs and improving resource utilization.

[0068] Furthermore, the ion exchange resin boron removal device 1 is also provided with a discharge port, and the discharge port is connected to a discharge container 8 .

[0069] Furthermore, a pH probe is provided in the boron-lithium recovery container 9 .

[0070] In the present invention, the pre-regeneration liquid, the regeneration liquid, the pre-transformation liquid and the transformation liquid all enter the boron-lithium recovery container 9, and the above liquids are rich in boron and lithium resources. The total pH of the liquid in the boron-lithium recovery container 9 is controlled to be 3-6.

[0071] Furthermore, the boron extraction device comprises a membrane concentrator 11 and an evaporator 12 which are connected in sequence, and the inlet of the membrane concentrator 11 is connected to the fresh water outlet of the electrodialysis device 10 .

[0072] In the utility model, the electrodialysis fresh water rich in boron can be concentrated by a membrane concentrator 11, and then the borax is evaporated by an evaporator 12 to obtain a borax product.

[0073] Furthermore, the lithium precipitation unit comprises a lithium precipitation device 5 , and a liquid inlet of the lithium precipitation device 5 is connected to a discharge port of the ion exchange resin boron removal device 1 .

[0074] The utility model can obtain lithium products such as lithium carbonate through treatment by the lithium precipitation device 5.

[0075] In another specific embodiment, the utility model provides a workflow for recovering lithium-boron resources from salt lake brine using the lithium-boron resource recovery system device, comprising the following steps:

[0076] S0, boron removal: After the salt lake brine is treated by the pretreatment unit, the Li ion concentration in the obtained feed liquid is 5g / L-30g / L, and the boron ion concentration is 0.005g / L-1g / L; then the feed liquid enters the ion exchange resin boron removal device 1 for boron removal, and the boron-removed feed liquid enters the lithium precipitation device 5 for lithium precipitation;

[0077] S1, top material: through the first water inlet pipeline and the spray assembly, water is passed into the ion exchange resin boron removal device 1 to elute the boron removal ion exchange resin, and the lithium ions rich in the ion exchange resin are pushed out. The obtained lithium-rich feed liquid enters the reverse osmosis concentration device 2 through the first washing liquid outlet and the reflux port in turn to recover most of the lithium resources therein;

[0078] S2, backwashing: water enters from the bottom of the ion exchange resin boron removal device 1 through the second water inlet pipeline, and the boron removal ion exchange resin after elution is backwashed, and air scrubbing is simultaneously used in the backwashing process, and the backwashing time is 0 to 60 seconds; after standing, the backwash liquid enters the reverse osmosis concentration device 2 through the second washing liquid outlet and the reflux port in turn, so as to remove the lithium ions remaining between the boron removal ion exchange resins and recover lithium resources; wherein the air scrubbing can enhance the release of lithium ions and enhance the recovery effect;

[0079] S3, pre-regeneration: the waste acid in the regeneration liquid recovery container 6 in step S5 is used to pre-regenerate the boron removal ion exchange resin, the regeneration volume is 0.5-1BV, and the generated pre-regeneration liquid is rich in lithium and boron, and enters the boron lithium recovery container 9 through the boron lithium recovery liquid outlet;

[0080] S4, regeneration: using the acid solution with a concentration of 4-6% in the regeneration liquid storage container 3 to regenerate the boron removal ion exchange resin, the regeneration volume is 0.5-1BV, and the generated regeneration liquid is rich in lithium and boron, and enters the boron lithium recovery container 9 through the boron lithium recovery liquid outlet;

[0081] S5, waste acid recovery: after regeneration in step S4, the boron removal ion exchange resin is rinsed with water, and the obtained waste acid enters the regeneration liquid recovery container 6 through the regeneration liquid outlet of the ion exchange resin boron removal device 1;

[0082] S6, elution: after the waste acid is recovered, the boron removal ion exchange resin is eluted with water, the elution volume is 1-2 BV, and the waste water after elution is discharged into the discharge container 8;

[0083] S7, pre-transformation: using the waste alkali in the transformation liquid recovery container 7 in step S9 to pre-transform the boron removal ion exchange resin, the transformation volume is 0.5-1BV, and the resulting pre-transformation liquid is rich in lithium and boron and enters the boron lithium recovery container 9 through the boron lithium recovery liquid outlet;

[0084] S8, transformation: using the transformation liquid storage container 4 with a concentration of 3-5% alkaline solution to transform the boron removal ion exchange resin, the transformation volume is 0.5-1BV, the generated transformation liquid is rich in lithium and boron, and enters the boron lithium recovery container 9 through the boron lithium recovery liquid outlet;

[0085] S9, waste alkali recovery: after the transformation in step S8, the boron removal ion exchange resin is rinsed with water, and the waste alkali obtained enters the transformation liquid recovery container 7 through the transformation liquid outlet of the ion exchange resin boron removal device 1;

[0086] S10, elution: after the waste alkali is recovered, the boron removal ion exchange resin is eluted with water, the elution volume is 1-2 BV, and the waste water after elution is discharged into the discharge container 8;

[0087] S11, lithium-boron separation: the feed liquid in the boron-lithium recovery container 9 enters the electrodialysis device 10 to separate lithium and boron; during the electrodialysis separation of boron and lithium, two streams of produced water are generated, namely, electrodialysis concentrated water rich in lithium and electrodialysis fresh water rich in boron;

[0088] S11, lithium and boron extraction: the lithium-rich electrodialysis concentrate is returned to the reverse osmosis concentration device 2 through the concentrate inlet to further recover lithium resources; the feed liquid concentrated by the reverse osmosis concentration device 2 enters the ion exchange resin boron removal device 1 to remove boron, and the feed liquid after boron removal enters the lithium precipitation device 5 for treatment to obtain a lithium carbonate product; at the same time, the boron-rich electrodialysis fresh water is concentrated by the membrane concentrator 11, and then the borax is evaporated by the evaporator 12 to obtain a borax product.

[0089] In summary, the lithium-boron resource recovery system device in salt lake brine provided by the utility model is used to recover lithium and boron, which saves more than 50% of acid and alkali consumption compared with the traditional process, and the lithium loss rate is less than 0.01%, and the boron recovery rate is greater than 98%.

[0090] The above description is only a specific implementation method of the present utility model, but the protection scope of the present utility model is not limited thereto. Technicians in the relevant technical field should understand that any changes or substitutions that can be easily thought of by technicians in the relevant technical field within the technical scope disclosed in the present utility model fall within the protection scope and disclosure scope of the present utility model.

Claims

1. A lithium-boron resource recovery system device in salt lake brine, characterized in that: The lithium-boron resource recovery system device in salt lake brine comprises a pre-treatment unit, a boron removal unit and a lithium precipitation unit; The boron removal unit comprises an ion exchange resin boron removal device, a regeneration liquid storage device, a transformation liquid storage device, a boron-lithium recovery container, an electrodialysis device and a boron extraction device; The ion exchange resin deboronization device is provided with a feed inlet, a discharge port, a regeneration liquid inlet, a transformation liquid inlet and a boron-lithium recovery liquid outlet, the feed inlet is connected to the feed liquid outlet end of the pre-treatment unit, the discharge port is connected to the liquid inlet end of the lithium precipitation unit, the regeneration liquid inlet and the transformation liquid inlet are respectively connected to the regeneration liquid storage device and the transformation liquid storage device, and the boron-lithium recovery liquid outlet is sequentially connected to the boron-lithium recovery container and the electrodialysis device along the flow direction of the boron-lithium recovery liquid; The electrodialysis device has a concentrated water outlet and a fresh water outlet. The concentrated water outlet is connected to the concentrated water inlet of the pre-treatment unit, and the fresh water outlet is connected to the inlet of the boron extraction device.

2. The lithium-boron resource recovery system device in salt lake brine according to claim 1, characterized in that: The pretreatment unit includes a de-impurity device and a reverse osmosis concentration device connected in sequence; the reverse osmosis concentration device is provided with a feed liquid inlet, a concentrate water inlet and a feed liquid outlet, the feed liquid inlet is connected to the outlet of the de-impurity device, the concentrate water inlet is connected to the concentrate water outlet of the electrodialysis device, and the feed liquid outlet is connected to the feed inlet of the ion exchange resin boron removal device.

3. The lithium-boron resource recovery system in salt lake brine according to claim 2 is characterized in that: The impurity removal device comprises a pre-impurity remover and a nanofilter which are sequentially connected along the flow direction of the salt lake brine, and the outlet of the nanofilter is connected to the feed liquid inlet of the reverse osmosis concentration device.

4. The lithium-boron resource recovery system device in salt lake brine according to claim 1, characterized in that: The top of the ion exchange resin boron removal device is provided with a rinsing port, and the rinsing port is connected to a first water inlet pipeline; the top of the inner cavity of the ion exchange resin boron removal device is provided with a spray component, and the water inlet of the spray component is connected to the rinsing port; A backwash port is provided at the bottom of the ion exchange resin boron removal device, and the backwash port is connected to a second water inlet pipeline.

5. The lithium-boron resource recovery system device in salt lake brine according to claim 2, characterized in that: The reverse osmosis concentration device is also provided with a reflux port; The bottom and top of the ion exchange resin boron removal device are respectively provided with a first washing liquid outlet and a second washing liquid outlet; the first washing liquid outlet and the second washing liquid outlet are both connected to the reflux port.

6. The lithium-boron resource recovery system in salt lake brine according to claim 1, characterized in that: The regeneration liquid storage device comprises a regeneration liquid storage container and a regeneration liquid recovery container; The regeneration liquid inlet of the ion exchange resin boron removal device includes a first regeneration liquid inlet and a second regeneration liquid inlet; the first regeneration liquid inlet is connected to the outlet of the regeneration liquid storage container, and the second regeneration liquid inlet is connected to the outlet of the regeneration liquid recovery container; The ion exchange resin boron removal device is also provided with a regeneration liquid outlet, and the regeneration liquid outlet is connected to the inlet of the regeneration liquid recovery container.

7. The lithium-boron resource recovery system device in salt lake brine according to claim 1, characterized in that: The transformation liquid storage device comprises a transformation liquid storage container and a transformation liquid recovery container; The transition liquid inlet of the ion exchange resin boron removal device includes a first transition liquid inlet and a second transition liquid inlet; the first transition liquid inlet is connected to the outlet of the transition liquid storage container, and the second transition liquid inlet is connected to the outlet of the transition liquid recovery container; The ion exchange resin boron removal device is also provided with a transition liquid outlet, and the transition liquid outlet is connected to the inlet of the transition liquid recovery container.

8. The lithium-boron resource recovery system in salt lake brine according to claim 1, characterized in that: The ion exchange resin boron removal device is also provided with a discharge port, and the discharge port is connected to a discharge container; A pH probe is arranged in the boron-lithium recovery container.

9. The lithium-boron resource recovery system device in salt lake brine according to claim 1, characterized in that: The boron extraction device comprises a membrane concentrator and an evaporator which are connected in sequence, and the inlet of the membrane concentrator is connected to the fresh water outlet of the electrodialysis device.

10. The lithium-boron resource recovery system in salt lake brine according to claim 1, characterized in that: The lithium precipitation unit comprises a lithium precipitation device, and the liquid inlet of the lithium precipitation device is connected to the discharge port of the ion exchange resin boron removal device.

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