Extraction equipment for extracting lithium from salt lake

Abstract

The utility model relates to the technical field of salt lake lithium extraction, in particular to salt lake lithium extraction equipment which comprises a boron centrifugal extractor, a lithium centrifugal extractor and an automatic circulation light phase pipeline system, and the automatic circulation light phase pipeline system comprises a PLC (programmable logic controller) control electric box, a digital display boron concentration sensor and a pipeline main body. The pipeline main body comprises a light phase liquid pipe which is arranged between the boron centrifugal extractor and the lithium centrifugal extractor in a penetrating manner and contains low-concentration boron and a diluted brine ingress pipe which is arranged at a light phase inlet of the boron centrifugal extractor in a penetrating manner, and the light phase liquid pipe containing low-concentration boron and the diluted brine ingress pipe are connected through a return pipe in a penetrating manner; the whole equipment can perform multiple times of circulating boron extraction on the brine before lithium extraction until boron in the brine reaches a proper concentration, so that the process difficulty of purification or subsequent processing of a lithium salt product is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium extraction from salt lakes, in particular to a salt lake lithium extraction extraction device. Background Art

[0002] At present, the main salt lake brine extraction technologies used include precipitation, calcination leaching, carbonization, solvent extraction, adsorption, electrodialysis, membrane separation, etc. The advantage of solvent extraction is that this technology is suitable for extracting lithium from salt lake brine with a high magnesium-lithium ratio, thereby separating magnesium and lithium, and the lithium yield can reach more than 97%.

[0003] Lithium-containing brine generally contains metal elements such as lithium, sodium, magnesium, and calcium, as well as non-metal elements such as silicon, boron, sulfur, chlorine, and bromine. Metal elements and non-metal elements such as silicon and sulfur can be separated by classification, crystallization, and sedimentation to obtain lithium salts of higher purity. Since the boron element exists in the brine in the form of boric acid or borates, and boric acid or borates have a large solubility in water, it is difficult to reduce the boron element in the brine to a lower level, which brings greater process difficulties to the subsequent purification or processing of lithium salt products.

[0004] Therefore, it is necessary to design a salt lake lithium extraction equipment to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of the utility model is to provide a salt lake lithium extraction device, which can perform multiple cycles of boron extraction on brine before lithium extraction until the boron in the brine reaches a suitable concentration, greatly reducing the difficulty of purification or subsequent processing of lithium salt products, thereby solving the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A salt lake lithium extraction equipment comprises a boron centrifugal extractor, a lithium centrifugal extractor and an automatic circulation light phase pipeline system, wherein the automatic circulation light phase pipeline system comprises a PLC control electric box, a digital boron concentration sensor and a pipeline body, wherein the pipeline body comprises a light phase liquid pipe containing low-concentration boron installed between the boron centrifugal extractor and the lithium centrifugal extractor and a dilution brine introduction pipe installed at the light phase inlet of the boron centrifugal extractor, wherein the light phase liquid pipe containing low-concentration boron and the dilution brine introduction pipe are connected through a reflux pipe, and a first electric valve, a second electric valve and a third electric valve are fixedly installed on the light phase liquid pipe containing low-concentration boron, the dilution brine introduction pipe and the reflux pipe, respectively.

[0008] As a preferred solution of the utility model, a lithium diluent tube is installed through one side of the light phase liquid tube containing low-concentration boron near one end of the lithium centrifugal extractor, and a fourth electric valve is fixedly installed on the lithium diluent tube. The first electric valve, the second electric valve, the third electric valve, the fourth electric valve, the digital boron concentration sensor and the pipeline body are electrically connected, and the digital boron concentration sensor is embedded and installed on the outer surface of the boron centrifugal extractor near the light phase collection chamber.

[0009] As a preferred solution of the utility model, the end of the dilution brine inlet pipe away from the light phase inlet of the boron centrifugal extractor is respectively provided with an original brine pipe and a boron diluent pipe.

[0010] As a preferred solution of the utility model, the boron centrifugal extractor and the lithium centrifugal extractor both include a main extraction cylinder and a supporting device.

[0011] As a preferred solution of the utility model, a mechanical seal is arranged at the center of the bottom end of the main extraction cylinder, a heavy phase inlet and a heavy phase outlet are respectively arranged at the bottom and the top end of one side of the main extraction cylinder, a light phase inlet and a light phase outlet are respectively arranged at the bottom and the top end of the other side of the main extraction cylinder, a sealing cylinder cover is fixedly installed at the top end of the main extraction cylinder, a stirring motor is fixedly installed at the center of the top surface of the sealing cylinder cover, and a rotating drum is movably installed inside the main extraction cylinder.

[0012] As a preferred solution of the utility model, the support device includes a sleeve mounted on the outer surface of the main extraction cylinder and a horizontal base located at the bottom of the main extraction cylinder. The sleeve and the horizontal base are fixedly connected by a plurality of groups of equidistantly distributed support frames.

[0013] Beneficial effects: It is difficult to reduce the boron element in brine to a low level in the existing salt lake lithium extraction solvent extraction process, which brings great process difficulty problems to the subsequent purification or subsequent processing of lithium salt products. The utility model can perform multiple cycles of boron extraction on the brine before lithium extraction through the automatic circulation light phase pipeline system set up until the boron in the brine reaches a suitable concentration, which greatly reduces the process difficulty of purification or subsequent processing of lithium salt products, thereby solving the problems raised in the above background technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a diagram of the overall connected three-dimensional external structure of the utility model;

[0015] Figure 2 It is a three-dimensional enlarged structural diagram of the automatic circulation light phase pipeline system in the utility model;

[0016] Figure 3 This is a three-dimensional enlarged structural diagram of the centrifugal extractor in the utility model;

[0017] In the figure: 1. Boron centrifugal extractor; 2. Lithium centrifugal extractor; 3. Automatic circulation light phase pipeline system; 31. PLC control electric box; 32. Digital boron concentration sensor; 33. Pipeline body; 331. Light phase liquid pipe containing low concentration of boron; 3311. First electric valve; 332. Dilution brine inlet pipe; 3321. Second electric valve; 3322. Original brine pipe; 3323. Boron diluent pipe; 333. Reflux pipe; 3331. Third electric valve; 334. Lithium diluent pipe; 3341. Fourth electric valve; 4. Main extraction cylinder; 41. Mechanical seal; 42. Heavy phase inlet; 43. Heavy phase outlet; 44. Light phase inlet; 45. Light phase outlet; 46. Sealing cylinder cover; 47. Stirring motor; 5. Support device; 51. Cylinder sleeve; 52. Horizontal base; 53. Support frame. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0019] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant literature, and several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0020] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this article includes any and all combinations of one or more related listed items.

[0022] See also Figure 1-3 , the utility model provides a technical solution:

[0023] A salt lake lithium extraction equipment comprises a boron centrifugal extractor 1, a lithium centrifugal extractor 2 and an automatic circulation light phase pipeline system 3, wherein the automatic circulation light phase pipeline system 3 comprises a PLC control electric box 31, a digital display boron concentration sensor 32 and a pipeline body 33, wherein the pipeline body 33 comprises a light phase liquid pipe 331 containing low concentration boron and installed between the boron centrifugal extractor 1 and the lithium centrifugal extractor 2 and a dilution brine introduction pipe 332 installed at the light phase inlet of the boron centrifugal extractor 1, wherein the light phase liquid pipe 331 containing low concentration boron and the dilution brine introduction pipe 332 are connected through a reflux pipe 333, and a first electric valve 3311, a second electric valve 3321 and a third electric valve 3331 are fixedly installed on the light phase liquid pipe 331 containing low concentration boron, the dilution brine introduction pipe 332 and the reflux pipe 333, respectively.

[0024] Specifically, the boron centrifugal extractor 1 and the lithium centrifugal extractor 2 both include a main extraction cylinder 4 and a supporting device 5. After being diluted with a diluent, the original brine is introduced into the boron centrifugal extractor 1 through the dilution brine inlet pipe 332, and mixed and separated by the extractant through the main extraction cylinder 4. The digital boron concentration sensor 32 can perform real-time detection of the separated light phase. At this time, the boron content concentration of the light phase liquid for the initial boron removal is relatively high. At the same time, the first electric valve 3311 and the second electric valve 3321 are closed, and the third electric valve 3331 is opened. At the same time, the light phase liquid that has completed the initial boron removal will re-enter the boron centrifugal extractor 1 through the reflux pipe 333 for boron removal, and the cycle is repeated many times until the separated light phase is completely removed. The boron content concentration of the light phase is low. At this time, the first electric valve 3311 and the second electric valve 3321 are opened, and the third electric valve 3331 is closed. At the same time, the light phase with a low boron content concentration after separation will enter the lithium centrifugal extractor 2 for lithium extraction. The overall automatic circulation light phase pipeline system 3 can be used to perform multiple cycles of boron extraction on the brine before lithium extraction until the boron in the brine reaches a suitable concentration, which greatly reduces the process difficulty of purification or subsequent processing of lithium salt products, thereby effectively solving the problem that it is difficult to reduce the boron element in the brine to a low level in the existing salt lake lithium extraction solvent extraction process, which brings greater process difficulty to the subsequent purification or subsequent processing of lithium salt products;

[0025] Preferably, a lithium diluent tube 334 is installed through one side of the light phase liquid pipe 331 containing low concentration of boron near one end of the lithium centrifugal extractor 2, and a fourth electric valve 3341 is fixedly installed on the lithium diluent tube 334. The first electric valve 3311, the second electric valve 3321, the third electric valve 3331, the fourth electric valve 3341, the digital boron concentration sensor 32 and the pipeline body 33 are electrically connected, and the digital boron concentration sensor 32 is embedded and installed on the outer surface of the boron centrifugal extractor 1 near the light phase collection chamber; the dilution brine inlet pipe 332 is far away from the light phase inlet of the boron centrifugal extractor 1 and is respectively provided with the original brine pipe 3322, the boron diluent pipe 3321 and the fourth electric valve 3341. The release agent tube 3323 can dilute the liquid phase before lithium and boron extraction by setting the lithium diluent tube 334 and the boron diluent tube 3323, thereby reducing the amount of extractant, facilitating phase separation, improving extraction efficiency, improving the utilization rate of the extractant, and reducing the burden of the recovery stage, thereby effectively reducing the loss of solvent during the solvent extraction process. At the same time, the first electric valve 3311, the second electric valve 3321, the third electric valve 3331, the fourth electric valve 3341, the digital boron concentration sensor 32 and the pipeline body 33 are electrically connected to enable the automatic circulation light phase pipeline system 3 to automatically circulate, which is more efficient and convenient to manage;

[0026] Preferably, a mechanical seal 41 is provided at the center of the bottom end of the main extraction cylinder 4, a heavy phase inlet 42 and a heavy phase outlet 43 are respectively provided at the bottom and the top end of one side of the main extraction cylinder 4, a light phase inlet 44 and a light phase outlet 45 are respectively provided at the bottom and the top end of the other side of the main extraction cylinder 4, a sealing cylinder cover 46 is fixedly installed at the top end of the main extraction cylinder 4, a stirring motor 47 is fixedly installed at the center of the top surface of the sealing cylinder cover 46, and a rotary drum is movably installed inside the main extraction cylinder 4. During the solvent extraction process, the diluted brine and the solvent are moved in the main extraction cylinder 4. The mixed liquid formed after mixing inside the cylinder 4 enters the drum. Driven by the drum and its spokes, the mixed liquid and the drum rotate synchronously at high speed to generate centrifugal force. Under the action of the centrifugal force, the liquid with higher density gradually moves away from the center of the drum and toward the drum wall during the upward flow, and the liquid with lower density gradually moves away from the drum wall and toward the center. Finally, the two-phase liquids are thrown into the collection chamber through their respective channels, and the two phases flow out from their respective collection chambers, thereby completing the two-phase separation process, which can improve production efficiency, improve product quality, and reduce production costs;

[0027] Preferably, the support device 5 includes a sleeve 51 sleeved on the outer surface of the main extraction cylinder 4 and a horizontal base 52 located at the bottom of the main extraction cylinder 4. The sleeve 51 and the horizontal base 52 are fixedly connected by a plurality of groups of equally spaced support frames 53. The support device 5 can help ensure the stability and reliability of the main extraction cylinder during operation.

[0028] In summary, the utility model can perform multiple cycles of boron extraction on brine before lithium extraction until the boron in the brine reaches a suitable concentration, which greatly reduces the difficulty of purification or subsequent processing of lithium salt products.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A salt lake lithium extraction equipment, comprising a boron centrifugal extractor (1), a lithium centrifugal extractor (2) and an automatic circulation light phase pipeline system (3), characterized in that: The automatic circulation light phase pipeline system (3) comprises a PLC control electric box (31), a digital display boron concentration sensor (32) and a pipeline body (33). The pipeline body (33) comprises a light phase liquid pipe (331) containing low concentration boron and installed between a boron centrifugal extractor (1) and a lithium centrifugal extractor (2) and a dilution brine inlet pipe (332) installed at the light phase inlet of the boron centrifugal extractor (1). The light phase liquid pipe (331) containing low concentration boron and the dilution brine inlet pipe (332) are connected through a reflux pipe (333). A first electric valve (3311), a second electric valve (3321) and a third electric valve (3331) are fixedly installed on the light phase liquid pipe (331) containing low concentration boron, the dilution brine inlet pipe (332) and the reflux pipe (333), respectively.

2. A salt lake lithium extraction equipment according to claim 1, characterized in that: A lithium diluent tube (334) is installed through one side of the light phase liquid tube (331) containing low-concentration boron near one end of the lithium centrifugal extractor (2), and a fourth electric valve (3341) is fixedly installed on the lithium diluent tube (334). The first electric valve (3311), the second electric valve (3321), the third electric valve (3331), the fourth electric valve (3341), the digital boron concentration sensor (32) and the pipeline body (33) are electrically connected, and the digital boron concentration sensor (32) is embedded and installed on the outer surface of the boron centrifugal extractor (1) near the light phase collection chamber.

3. A salt lake lithium extraction equipment according to claim 1, characterized in that: The dilution brine inlet pipe (332) is provided with a raw brine pipe (3322) and a boron diluent pipe (3323) at one end away from the light phase inlet of the boron centrifugal extractor (1).

4. The lithium extraction equipment for salt lake according to claim 1, characterized in that: The boron centrifugal extractor (1) and the lithium centrifugal extractor (2) both comprise a main extraction cylinder (4) and a supporting device (5).

5. A salt lake lithium extraction equipment according to claim 4, characterized in that: A mechanical seal (41) is arranged at the center of the bottom end of the main extraction cylinder (4); a heavy phase inlet (42) and a heavy phase outlet (43) are respectively arranged at the bottom end and the top end of one side of the main extraction cylinder (4); a light phase inlet (44) and a light phase outlet (45) are respectively arranged at the bottom end and the top end of the other side of the main extraction cylinder (4); a sealing cylinder cover (46) is fixedly installed at the top end of the main extraction cylinder (4); a stirring motor (47) is fixedly installed at the center of the top surface of the sealing cylinder cover (46); and a rotating drum is movably installed inside the main extraction cylinder (4).

6. A salt lake lithium extraction equipment according to claim 4, characterized in that: The support device (5) comprises a sleeve (51) sleeved on the outer surface of the main extraction cylinder (4) and a horizontal base (52) located at the bottom of the main extraction cylinder (4); the sleeve (51) and the horizontal base (52) are fixedly connected via a plurality of groups of equidistantly distributed support frames (53).

Images