Dynamic three-dimensional crystallization device

Abstract

The utility model discloses a dynamic three-dimensional crystallization device, relates to the field of salt lake lithium extraction process equipment, and can solve the problem of low lithium carbonate crystallization efficiency caused by the fact that a three-dimensional crystallization nucleation matrix is fixedly arranged in a solar pond in the prior art. The dynamic three-dimensional crystallization device comprises a stand column connected to the pond bottom of the solar pond, a rotating disc rotationally connected to the end, away from the pond bottom of the solar pond, of the stand column, a hanging frame connected to the bottom of the rotating disc and immersed in brine in the solar pond, and a driving piece connected to the rotating disc and used for driving the rotating disc to rotate. The hanging rack is connected with a plurality of hanging ropes extending towards the bottom of the solar pond in a hanging manner, and the hanging ropes are uniformly connected with a plurality of base bodies for providing solid-liquid contact surfaces for crystallization of lithium carbonate at intervals in the length extension directions of the hanging ropes.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lithium extraction process equipment from salt lakes, in particular to a dynamic three-dimensional crystallization device. BACKGROUND

[0002] Lithium carbonate is an important member of lithium compounds and is widely used in modern industry and high-tech fields. It is a key material for lithium batteries in electric vehicles and portable electronic devices, and with the rapid development of these industries, the demand for lithium carbonate is also growing. In addition, lithium carbonate also plays an important role in glass and ceramic manufacturing, medicine, metallurgy, and air purification industries.

[0003] In the prior art, the concentration-precipitation method is a commonly used method for extracting lithium carbonate from salt lake brine. The solar pond process is one of the processes, which is a process in which salt lake brine is concentrated by grading and solarization in multiple salt pans to produce high-lithium brine that meets the requirements. After heating the brine in the salt gradient solar pond, lithium in the form of lithium carbonate is crystallized and precipitated to obtain lithium carbonate concentrate product. The core of the lithium extraction process by solar pond is the solar pond 1, as shown in Figure 1 from top to bottom, which is composed of 3 layers. The upper layer 11 is the upper convection layer (fresh water layer) composed of fresh water, which has a temperature close to the ambient temperature, mainly serving to form and protect the lower salt gradient layer; the lower layer 13 is the lower convection layer (energy storage area) composed of saturated salt solution, mainly serving to absorb and store heat; the middle layer 12 is the non-convection layer (salt gradient layer), the salt concentration increases with the depth, not only prevents heat loss on the surface of the pond, but also uses the difference in refractive index between fresh water and brine to store heat in the bottom brine, making the temperature of the lower convection layer much higher than that of the upper convection layer, achieving the effect of collecting and storing solar energy and increasing the temperature of the brine.

[0004] With the solar pond 1 as the crystallization pond of lithium carbonate, the solar pond 1 forms a salt gradient layer, which can not only increase the temperature of the high-lithium brine in the lower convection layer, but also effectively suppress the evaporation of the brine in the lower convection layer, thereby avoiding the precipitation of other salts, ultimately promoting the large-scale precipitation of lithium carbonate at the bottom of the pond and improving the quality of lithium carbonate. The three-dimensional crystallization process of the crystallization pond is the key optimization direction to improve the production efficiency of lithium carbonate in the crystallization pond. Based on the heterogeneous nucleation theory, the three-dimensional crystallization nucleation matrix 2 is placed in the pond body to provide more solid-liquid contact surface and attachment matrix for lithium carbonate nucleation, thereby improving the precipitation efficiency and product quality of lithium carbonate.

[0005] However, the nucleation substrate currently adopted is a fixed device, and during the crystallization process, due to the limited ion diffusion rate, the ions in the brine can only rely on natural diffusion to the surface of the substrate, and the diffusion rate of the ions is generally slow, especially in the environment with low flowability of the brine, which is easy to cause low lithium carbonate crystallization efficiency and uneven growth of the crystals on the substrate. Practical new type content

[0006] Therefore, the application provides a dynamic three-dimensional crystallization device to solve the problem of low lithium carbonate crystallization efficiency caused by the fixed setting of the three-dimensional crystallization nucleation substrate in the solar pond in the prior art.

[0007] In order to achieve the above-mentioned purpose, the application provides the following technical scheme:

[0008] A dynamic three-dimensional crystallization device, comprising a stand connected to the bottom of a solar pond, a rotating disc rotatably connected to one end of the stand away from the bottom of the solar pond, a hanger connected to the bottom of the rotating disc and immersed in the brine in the solar pond, and a driving member connected to the rotating disc and used for driving the rotating disc to rotate, the hanger is hung with a plurality of hanging ropes extending towards the direction of the bottom of the solar pond, and the hanging ropes are uniformly and spacedly connected with a plurality of substrates for providing solid-liquid contact surfaces for lithium carbonate crystallization along the length direction of the hanging ropes.

[0009] Optionally, the driving member comprises a plurality of blades uniformly connected to the top of the rotating disc along the circumferential direction of the rotating disc, and the plurality of blades are located above the brine liquid level of the solar pond to cooperate with the wind to drive the rotating disc to rotate around the stand.

[0010] Optionally, the rotating disc comprises a rotating drum rotatably connected to the stand, a first ring plate connected to the top of the rotating drum, and a second ring plate connected to the bottom of the rotating drum, a plurality of the blades are uniformly connected to the edge of the first ring plate along the circumferential direction of the first ring plate, and the hanger is detachably connected to the second ring plate through a plurality of fasteners.

[0011] Optionally, the hanger is a grid-shaped frame formed by a plurality of connecting rods being staggered connected, and the rotating disc is connected to the center of the grid-shaped frame.

[0012] Optionally, a plurality of first reinforcing ribs are connected between the first ring plate and the second ring plate, and the plurality of first reinforcing ribs are uniformly distributed along the circumferential direction of the rotating drum.

[0013] Optionally, one end of the stand close to the bottom of the solar pond is connected with a support main plate supported on the bottom of the solar pond, and support wing plates are distributed and connected on both sides of the support main plate for supporting the bottom of the solar pond.

[0014] Optionally, a second reinforcing rib is provided between the column and the supporting main plate, and between the column and the supporting wing plate.

[0015] Compared with the prior art, this application has at least the following beneficial effects:

[0016] The support column provides support for the turntable, hanger, and drive unit. The drive unit's rotation causes the turntable to rotate, which in turn rotates the hanger connected to the bottom of the turntable. The rotation of the hanger further causes periodic disturbances in the brine along the hanging rope and the multiple substrates attached to it. This dynamic disturbance, by agitating the brine in the salt gradient solar pool, breaks down the concentration and temperature gradients. The temperature difference between different layers of brine promotes the formation of three-dimensional eddies between these layers. The generation of these eddies effectively facilitates the diffusion of lithium and carbonate ions between different layers, lowering the nucleation threshold, breaking down the energy barrier at the liquid-solid interface, and accelerating the crystallization process of lithium carbonate. Simultaneously, the periodic movement of the substrates breaks down the ion concentration boundary layer on the substrate surface, ensuring that the ion concentration on the substrate surface remains at a high level, thereby promoting the uniform deposition and rapid growth of lithium carbonate crystals. Attached Figure Description

[0017] To more intuitively illustrate the prior art and this application, several exemplary figures are provided below. It should be understood that the specific shapes and structures shown in the figures should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary figures, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0018] Figure 1 This is a schematic diagram of the structure of a solar pool in the prior art;

[0019] Figure 2 This is a schematic diagram of the structure of a dynamic three-dimensional crystallization device provided in one embodiment of this application;

[0020] Figure 3 for Figure 2 Enlarged view of point A;

[0021] Figure 4 A schematic diagram illustrating the interaction between a dynamic three-dimensional crystallization device and a solar pool, provided as an embodiment of this application;

[0022] Figure 5 A schematic diagram illustrating the fit between the hanging rope and the substrate of a dynamic three-dimensional crystallization device according to one embodiment of this application;

[0023] Figure 6 for Figure 2 Top view.

[0024] Reference Signs List:

[0025] 1. solar pond; 11. upper layer; 12. middle layer; 13. lower layer; 2. three-dimensional crystal nucleation substrate; 3. stand; 4. rotating disc; 41. rotating drum; 42. first ring plate; 43. second ring plate; 44. first reinforcing rib; 5. driving member; 51. blade; 6. hanger; 61. connecting rod; 7. support main plate; 71. support wing plate; 72. second reinforcing rib; 8. hanging rope; 9. substrate. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0027] In the description of the present application: unless otherwise specified, the meaning of "a plurality of" is two or more. The terms "first", "second", "third" and the like in the present application are intended to distinguish the objects referred to, and do not have special meanings in the technical connotation aspect (for example, it should not be understood as emphasizing importance or order, etc.). The expressions "include", "contain", "have" and the like also mean "not limited to" (some units, components, materials, steps, etc.). Figure 4 The upper dashed line is the liquid level of the brine in the solar pond, and the lower dashed line is the bottom of the solar pond.

[0028] Reference Figures 1-6 The dynamic three-dimensional crystal device of the present application comprises a stand 3 connected to the bottom of the solar pond 1, a rotating disc 4 rotatably connected to the end of the stand 3 away from the bottom of the solar pond 1, a hanger 6 connected to the bottom of the rotating disc 4 and immersed in the brine in the solar pond 1, and a driving member 5 connected to the rotating disc 4 and used to drive the rotating disc 4 to rotate. The hanger 6 is hung with a plurality of hanging ropes 8 extending towards the direction of the bottom of the solar pond 1, and the hanging ropes 8 are uniformly spaced along the length direction of the hanging ropes 8 and connected with a plurality of substrates 9 for providing solid-liquid contact surface for lithium carbonate crystallization.

[0029] The stand 3 provides support for the rotating disc 4, the hanger 6 and the driving member 5. The driving member 5 rotates to drive the rotating disc 4 to rotate, so that the hanger 6 connected to the bottom of the rotating disc 4 rotates. The rotation of the hanger 6 further drives the hanging rope 8 and the plurality of substrates 9 on the hanging rope 8 to produce periodic disturbance in the brine, which agitates the brine in the salt gradient solar pond 1, breaks the concentration gradient and temperature gradient of the brine, and the temperature difference of the brine in different layers forms a three-dimensional vortex. The generation of the vortex can effectively drive the diffusion of lithium ions and carbonate ions between different layers, reduce the threshold of nucleation, break the energy barrier of the liquid-solid interface, and accelerate the crystallization process of lithium carbonate. At the same time, the periodic motion of the substrate 9 breaks the ion concentration boundary layer on the surface of the substrate 9, so that the ion concentration on the surface of the substrate 9 is always maintained at a high level, thereby promoting the uniform deposition and rapid growth of lithium carbonate crystals.

[0030] The driving member 5 includes a plurality of blades 51 uniformly connected to the top of the rotating disc 4 along the circumferential direction of the rotating disc 4. The plurality of blades 51 are located above the brine liquid level of the solar pond 1 to cooperate with the wind to drive the rotating disc 4 to rotate around the stand 3.

[0031] The driving member 5 includes a plurality of blades 51 uniformly distributed on the top of the rotating disc 4. The blades 51 are located above the brine liquid level of the solar pond 1 and are driven to rotate by natural wind. The natural wind drives the blades 51 to rotate, and the blades 51 drive the rotating disc 4 to rotate around the stand 3, further driving the hanger 6 to rotate in the brine, so that the plurality of hanging ropes 8 on the hanger 6 and the plurality of substrates 9 on the hanging ropes 8 rotate in the brine.

[0032] Through this wind-driven rotational motion, the hanger 6 and the substrate 9 produce disturbance in the brine, agitate the brine, form a three-dimensional vortex, break the static stratification of the brine, and promote the diffusion and mixing of lithium ions and carbonate ions in the salt gradient layer. The sufficient contact of lithium ions and carbonate ions accelerates the nucleation and crystallization process of lithium carbonate, so that lithium carbonate crystals are uniformly deposited on the surface of the substrate 9. At the same time, using natural wind energy as the driving force, no external energy source is needed, which is energy-saving and environmentally friendly, and reduces the operating cost of the device.

[0033] The rotating disc 4 includes a rotating cylinder 41 rotatably connected to the stand 3, a first ring plate 42 connected to the top of the rotating cylinder 41, and a second ring plate 43 connected to the bottom of the rotating cylinder 41. A plurality of blades 51 are uniformly connected to the edge of the first ring plate 42 along the circumferential direction of the first ring plate 42. The hanger 6 is detachably connected to the second ring plate 43 by a plurality of fasteners (such as bolts).

[0034] In operation, the blades 51 drive the first ring plate 42 to rotate by wind power, drive the rotating cylinder 41 and the second ring plate 43 to rotate synchronously, and the hanger 6 moves in the brine with the second ring plate 43. The detachable design facilitates the installation, replacement and maintenance of the hanger 6.

[0035] In some embodiments, the rotary drum 41 is sleeved on the top of the column 3, and a plurality of bearings are connected between the inner wall of the rotary drum 41 and the outer wall of the column 3.

[0036] The hanger 6 is a grid-shaped frame formed by the interlaced connection of a plurality of connecting rods 61, and the rotary disc 4 is connected at the center of the grid-shaped frame.

[0037] The grid structure of the frame is formed by the interlaced arrangement of the connecting rods 61, and can uniformly connect a plurality of hanging ropes 8. At the same time, the rotary disc 4 is located at the center position of the grid-shaped frame, so that the hanger 6 is more uniform in stress when rotating, effectively preventing the occurrence of eccentricity and ensuring smooth rotation.

[0038] In some embodiments, the connecting rods 61 can be integrally connected by welding to form a firm structure; or can be detachably connected by fasteners, facilitating on-site assembly, disassembly and maintenance.

[0039] A plurality of first reinforcing ribs 44 are connected between the first ring plate 42 and the second ring plate 43, and the first reinforcing ribs 44 are uniformly distributed along the circumferential direction of the rotary drum 41. The first reinforcing ribs 44 play a supporting role in structure, improving the overall strength and rigidity of the rotary disc 4.

[0040] The column 3 is connected at one end close to the bottom of the solar pond 1 to a support main plate 7 supported on the bottom of the solar pond 1, and support wing plates 71 for supporting on the bottom of the solar pond 1 are distributed on both sides of the support main plate 7.

[0041] In some embodiments, the support main plate 7 and the two support wing plates 71 can be fixedly connected to the bottom of the solar pond 1.

[0042] Second reinforcing ribs 72 are connected between the column 3 and the support main plate 7, and between the column 3 and the support wing plates 71. The second reinforcing ribs 72 improve the connection strength between the column 3, the support main plate 7 and the support wing plates 71.

[0043] The technical features of the above embodiments can be combined in any manner (as long as the combination of the technical features does not contradict). In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. These embodiments not explicitly written should also be considered as falling within the scope of the present application.

[0044] The above application has been described in detail through general description and specific embodiments. It should be understood that, based on the technical concept of the present application, some conventional adjustments or further innovations can be made to these specific embodiments; however, as long as these conventional adjustments or further innovations do not deviate from the technical concept of the present application, the technical solutions obtained thereby also fall within the protection scope of the claims of the present application.

Claims

1. A dynamic three-dimensional crystallization device, characterized in that, The device includes a column connected to the bottom of a solar pool, a turntable rotatably connected to one end of the column away from the bottom of the solar pool, a bracket connected to the bottom of the turntable and immersed in brine in the solar pool, and a drive unit connected to the turntable for driving the turntable to rotate. The bracket is attached with multiple hanging ropes extending toward the bottom of the solar pool, and the hanging ropes are evenly spaced along their length to be connected with multiple substrates for providing solid-liquid contact surfaces for lithium carbonate crystallization.

2. The dynamic three-dimensional crystallization apparatus according to claim 1, characterized in that, The driving component includes multiple blades evenly connected to the top of the turntable along the circumferential direction of the turntable. All of the blades are located above the brine surface of the solar pool to cooperate with wind power to drive the turntable to rotate around the column.

3. The dynamic three-dimensional crystallization apparatus according to claim 2, characterized in that, The turntable includes a rotating cylinder rotatably connected to the column, a first ring plate connected to the top of the rotating cylinder, and a second ring plate connected to the bottom of the rotating cylinder. A plurality of blades are evenly connected to the edge of the first ring plate along the circumferential direction of the first ring plate, and the bracket is detachably connected to the second ring plate by a plurality of fasteners.

4. The dynamic three-dimensional crystallization apparatus according to claim 1 or 3, characterized in that, The hanger is a grid-like frame formed by multiple connecting rods intersecting, and the turntable is connected to the center of the grid-like frame.

5. The dynamic three-dimensional crystallization apparatus according to claim 3, characterized in that, A plurality of first reinforcing ribs are connected between the first ring plate and the second ring plate, and the plurality of first reinforcing ribs are evenly distributed along the circumferential direction of the rotating cylinder.

6. The dynamic three-dimensional crystallization apparatus according to claim 1, characterized in that, The end of the column near the bottom of the solar pool is connected to a support main board that supports the bottom of the solar pool, and support wing plates for supporting the bottom of the solar pool are distributed on both sides of the support main board.

7. The dynamic three-dimensional crystallization apparatus according to claim 6, characterized in that, A second reinforcing rib is connected between the column and the main support plate, and between the column and the support wing plate.

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