Coarse lithium carbonate impurity removal using stirred tank

Abstract

The utility model discloses a rough lithium carbonate is with stirring and washing tank for impurity removal relates to the field of lithium carbonate preparation, to solve the problem that the stirring and washing device in the prior art rough lithium carbonate is stirred and washed and then is discharged through the discharge nozzle to the solution containing lithium carbonate, cannot realize after stirring and washing lithium carbonate and solution separate. The inside lower end surface annular array of stirring and washing tank jar is fixedly connected with a plurality of heating rod, the middle part of stirring and washing tank jar inside is fixedly arranged with spiral cooling coil, the middle part both sides of stirring and washing tank jar inside are fixedly arranged with the liquid suction tube, and two liquid suction tubes upper end respectively extend the upper end of both sides end surface of stirring and washing tank jar and all are fixedly connected with separation tank, and two separation tanks inside are provided with lithium carbonate filter box and impurity filter box respectively, through setting spiral cooling coil and the collaborative mechanism of heating rod, realized " low temperature dissolution - high temperature precipitation " cycle process, utilizes the characteristic that lithium carbonate solubility changes with temperature, and the impurity removal rate and product purity are improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of lithium carbonate preparation, specifically to a stirring tank for removing impurities from crude lithium carbonate. Background Technology

[0002] Lithium carbonate is an inorganic compound, appearing as a white powder or fine granules, odorless, slightly soluble in water, and alkaline. It is one of the most critical raw materials in the lithium industry chain, primarily used in the production of lithium-ion battery cathode materials (such as lithium cobalt oxide and lithium iron phosphate), widely applied in new energy vehicles, 3C electronics, and other fields. In addition, lithium carbonate has important applications in glass ceramics (lowering melting point), aluminum smelting (improving conductivity), medicine (treating bipolar disorder), and the nuclear industry. The preparation of lithium carbonate requires the crude lithium carbonate blank to be agitated in a washing tank.

[0003] For example, the authorized publication number CN221890512U discloses a washing device for crude battery-grade lithium carbonate, including a washing tank. A first motor is fixedly installed on the top of the washing tank, and a stirring paddle is fixedly connected to the output end of the first motor through the washing tank. In this utility model, by starting the second motor inside the waterproof shell, the output shaft at its output end is driven to rotate, causing the output shaft to drive the sealing plate to rotate in the circular groove at the bottom of the partition. Since a wear-resistant rubber pad is set on the two discharge holes corresponding to the partition on the sealing plate, the discharge holes are intermittently opened as the sealing plate rotates, realizing the intermittent discharge of crude lithium carbonate after washing. At this time, two rotating rods connected by a fixed sleeve on the output shaft are respectively fixed to a cleaning plate through a connecting rod. As the output shaft rotates, several rubber strips on the bottom surface of the cleaning plate can stir up the impurities on the surface of the filter screen, achieving the effect of cleaning the surface of the filter screen and having a good anti-clogging effect.

[0004] In the above-mentioned technology, the stirring and washing device washes the crude lithium carbonate and then discharges the solution containing lithium carbonate through the discharge nozzle. It cannot separate the lithium carbonate from the solution after stirring and washing. Therefore, the market urgently needs to develop a stirring and washing tank for removing impurities from crude lithium carbonate to help people solve the existing problems. Utility Model Content

[0005] The purpose of this invention is to provide a stirring and washing tank for removing impurities from crude lithium carbonate, in order to solve the problem mentioned in the background art where the stirring and washing device discharges the lithium carbonate-containing solution through the discharge nozzle after stirring and washing the crude lithium carbonate, and cannot separate the lithium carbonate from the solution after stirring and washing.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a stirring tank for removing impurities from crude lithium carbonate, comprising a stirring tank, wherein multiple heating rods are fixedly connected in a ring array to the lower end face of the stirring tank, a spiral cooling coil is fixedly installed in the middle of the stirring tank, and suction pipes are fixedly installed on both sides of the middle of the stirring tank. The upper ends of the two suction pipes extend out of the upper ends of the two side end faces of the stirring tank and are fixedly connected to separation boxes. A lithium carbonate filter box and an impurity filter box are respectively installed inside the two separation boxes, and a return pipe is fixedly connected to the lower end face of the two separation boxes.

[0007] Preferably, the upper and lower ends of the rear end of the spiral cooling coil are respectively fixedly connected to a coolant inlet pipe and a coolant outlet pipe, and the rear ends of both the coolant inlet pipe and the coolant outlet pipe extend out of the rear end face of the agitation tank.

[0008] Preferably, impurity pumps are fixedly connected to both of the two suction pipes and outside the agitation tank. A rectangular opening is provided on the side of the separation box away from the agitation tank. The lower ends of both return pipes extend to the lower end of the agitation tank. Filter screens are fixedly provided on the lower end of the lithium carbonate filter box and the impurity filter box.

[0009] Preferably, a feeding port and a liquid injection pipe are respectively provided on both sides of the middle of the upper end face of the agitation tank, a drain pipe is fixedly connected to the middle of the lower end of the agitation tank, a limit pipe is fixedly connected to the middle of the upper end face inside the agitation tank, and a rotating shaft is rotatably provided inside the limit pipe.

[0010] Preferably, the lower end of the rotating shaft extends to the lower middle part of the agitation tank and is fixedly connected with a spiral blade, and multiple agitator plates are fixedly connected to both sides of the middle part of the rotating shaft.

[0011] Preferably, a drive device is fixedly connected to the middle of the upper end face of the agitation tank, and a drive motor is fixedly installed inside the drive device.

[0012] Preferably, the upper end of the rotating shaft extends into the drive device and is fixedly connected to the output shaft of the drive motor.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) In this utility model, by setting a synergistic temperature control mechanism of spiral cooling coil and heating rod, a "low temperature dissolution-high temperature precipitation" cycle process is realized. By utilizing the characteristic that the solubility of lithium carbonate changes with temperature, the impurity removal rate and product purity are significantly improved.

[0015] (2) In this utility model, a dual filter box separation structure is adopted, and a switchable liquid suction pipeline system is used to realize graded filtration in the dissolved state and the precipitated state. It can effectively remove insoluble impurities and efficiently recover lithium carbonate crystals, thus solving the problem that traditional devices cannot achieve solid-liquid separation.

[0016] (3) In this utility model, an innovative stirring system with spiral blades is designed. Through the combined action of the stirring plate and the spiral blades, the uniform mixing of the solution is ensured, and the upper and lower circulation is formed, making the temperature distribution more uniform and greatly improving the mass transfer efficiency and crystal quality. Attached Figure Description

[0017] Figure 1 This is a front view of the stirring tank for removing impurities from crude lithium carbonate according to this utility model;

[0018] Figure 2 This is a front sectional view of the present invention;

[0019] Figure 3 This is a side sectional view of the rotating shaft of this utility model;

[0020] Figure 4 This is a side sectional view of the agitation tank of this utility model.

[0021] In the diagram: 1. Agitation tank; 101. Feeding port; 102. Liquid injection pipe; 103. Limiting pipe; 104. Heating rod; 105. Drain pipe; 2. Rotating shaft; 201. Agitator plate; 202. Spiral blade; 3. Drive device; 301. Drive motor; 4. Spiral cooling coil; 401. Coolant outlet pipe; 402. Coolant inlet pipe; 5. Suction pipe; 501. Impurity pump; 6. Separation box; 601. Rectangular opening; 602. Return pipe; 7. Lithium carbonate filter box; 701. Impurity filter box; 702. Filter screen. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figures 1-4This utility model provides an embodiment of a washing tank for removing impurities from crude lithium carbonate, comprising a washing tank 1. Multiple heating rods 104 are fixedly connected in a ring array to the lower end face of the washing tank 1. A spiral cooling coil 4 is fixedly arranged in the middle of the washing tank 1. Coolant inlet pipe 402 and coolant outlet pipe 401 are fixedly connected to the upper and lower ends of the rear end of the spiral cooling coil 4, respectively. The rear ends of both the coolant inlet pipe 402 and the coolant outlet pipe 401 extend beyond the rear end face of the washing tank 1. The coolant inlet pipe 402 and the coolant outlet pipe 401 extend out of the agitation tank 1 and are both connected to the refrigeration unit. Suction pipes 5 are fixedly installed on both sides of the middle section inside the agitation tank 1. The upper ends of the two suction pipes 5 extend out of the upper ends of the two side faces of the agitation tank 1 and are fixedly connected to separation boxes 6. A lithium carbonate filter box 7 and an impurity filter box 701 are respectively installed inside the two separation boxes 6. Return pipes 602 are fixedly connected to the lower ends of the two separation boxes 6. The two suction pipes 5 are connected to the agitation tank... 1. An impurity pump 501 is fixedly connected to the outside. A rectangular opening 601 is provided on the end face of the separation tank 6 away from the agitation tank 1. The lower ends of the two return pipes 602 extend to the lower end of the agitation tank 1. Filter screens 702 are fixedly provided on the lower end face of the lithium carbonate filter box 7 and the impurity filter box 701. When crude lithium carbonate is put into the agitation tank 1, coolant is delivered to the spiral cooling coil 4 through the cooling inlet pipe 402 by the refrigeration device, so that the spiral cooling coil 4 cools the agitation liquid in the agitation tank 1, so that the lithium carbonate is fully dissolved in the agitation liquid (the solubility of lithium carbonate increases as the temperature decreases). At this time, the impurity pump 501 on one side of the impurity filter box 701 draws out the agitation liquid in the agitation tank 1 through the suction pipe 5 and delivers it to the separation tank 6, so that the agitation liquid falls into the impurity filter box 701 and is filtered by the filter screen 702. An observation window can be set on the agitation tank 1 to facilitate observation of the turbidity of the agitation liquid in the agitation tank 1.

[0024] Please see Figure 2 When the washing liquid becomes clear, the impurity pump 501 on one side of the impurity filter box 701 is turned off and the refrigeration device is turned off. At the same time, multiple heating rods 104 are turned on to heat the washing liquid, so that lithium carbonate is fully separated after the temperature rises. The impurity pump 501 on one side of the lithium carbonate filter box 7 is turned on. At this time, the washing liquid inside the washing tank 1 is drawn out through the suction pipe 5 by the impurity pump 501 on one side of the lithium carbonate filter box 7 and transported to the separation box 6. The washing liquid falls into the lithium carbonate filter box 7 and is filtered by the filter screen 702. The lithium carbonate filter box 7 or the impurity filter box 701 can be drawn out of the separation box 6 through the rectangular opening 601.

[0025] Please see Figure 2 and Figure 3The upper end of the washing tank 1 is provided with a feeding port 101 and a liquid injection pipe 102 on both sides. Crude lithium carbonate and washing liquid are added into the washing tank 1 through the feeding port 101 and the liquid injection pipe 102, respectively. By controlling the ratio of crude lithium carbonate to washing liquid, the crude lithium carbonate can be completely dissolved in the washing liquid at a low temperature. A drain pipe 105 is fixedly connected to the lower end of the washing tank 1, and a drain valve is fixedly connected to the lower end of the drain pipe 105. After the lithium carbonate filtration and separation are completed, the drain valve is opened to discharge the washing liquid from the drain pipe 105. A limit tube 103 is fixedly connected to the upper end of the washing tank 1. A rotating shaft 2 is rotatably installed inside the limit tube 103, and the lower end of the rotating shaft 2 extends... A spiral blade 202 is fixedly connected to the lower middle part of the washing tank 1. Multiple agitator plates 201 are fixedly connected to both sides of the middle part of the rotating shaft 2. A drive device 3 is fixedly connected to the middle of the upper end face of the washing tank 1. A drive motor 301 is fixedly installed inside the drive device 3. The upper end of the rotating shaft 2 extends into the drive device 3 and is fixedly connected to the output shaft of the drive motor 301. The drive motor 301 drives the multiple agitator plates 201 and the spiral blade 202 to rotate, so that the agitator plates 201 agitate the washing liquid inside the washing tank 1. At the same time, the spiral blade 202 can transport the washing liquid at the lower end of the washing tank 1 upward, so that the washing liquid flows inside the washing tank 1 and improves the washing efficiency.

[0026] Working Principle: During operation, crude lithium carbonate raw material is first added to the washing tank 1 through the feeding port 101. Simultaneously, an appropriate amount of washing liquid is injected through the liquid injection pipe 102, controlling the solid-liquid ratio to ensure the lithium carbonate dissolves fully at low temperatures. The drive motor 301 is started, driving the rotating shaft 2 to rotate, causing the stirring plate 201 to powerfully stir the mixture. Simultaneously, the spiral blades 202 transport the liquid from the bottom upwards, forming a circulating flow and improving mixing efficiency. The refrigeration device is simultaneously activated, and coolant enters the spiral cooling coil 4 through the coolant inlet pipe 402 to cool the solution, utilizing the characteristic that the solubility of lithium carbonate increases with decreasing temperature to ensure complete dissolution. At this time, the impurity pump 501 on the impurity filter box 701 side is started, drawing the solution into the impurity filter box 701 through the suction pipe 5. Insoluble impurities are intercepted by the filter screen 702, and the filtrate returns to the washing tank 1 through the return pipe 602. After the solution clarifies, the refrigeration unit and impurity pump 501 are turned off, and the heating rod 104 is turned on to raise the temperature to 50-80℃, causing lithium carbonate to precipitate due to reduced solubility. The impurity pump 501 on the lithium carbonate filter box 7 is then switched on, drawing the suspension containing lithium carbonate crystals into the lithium carbonate filter box 7. The filter screen 702 traps the lithium carbonate product, and the filtrate is returned to the washing tank 1. Finally, the waste liquid is discharged through the drain pipe 105, and the purified product is obtained by removing the lithium carbonate filter box 7 through the rectangular opening 601. This device achieves effective separation of lithium carbonate and impurities through a "low-temperature dissolution-high-temperature precipitation" cycle process combined with a dual filtration system.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A washing tank for removing impurities from crude lithium carbonate, comprising a washing tank (1), characterized in that: Multiple heating rods (104) are fixedly connected in a ring array on the lower end face of the agitation tank (1). A spiral cooling coil (4) is fixedly installed in the middle of the agitation tank (1). Suction pipes (5) are fixedly installed on both sides of the middle of the agitation tank (1). The upper ends of the two suction pipes (5) extend out of the upper end face of both sides of the agitation tank (1) and are fixedly connected to separation boxes (6). A lithium carbonate filter box (7) and an impurity filter box (701) are respectively installed inside the two separation boxes (6). A return pipe (602) is fixedly connected to the lower end face of the two separation boxes (6).

2. The stirring and washing tank for removing impurities from crude lithium carbonate according to claim 1, characterized in that: The upper and lower ends of the spiral cooling coil (4) are respectively fixedly connected to a coolant inlet pipe (402) and a coolant outlet pipe (401), and the rear ends of the coolant inlet pipe (402) and the coolant outlet pipe (401) extend out of the rear end face of the agitation tank (1).

3. The stirring and washing tank for removing impurities from crude lithium carbonate according to claim 1, characterized in that: Impurity pumps (501) are fixedly connected to both of the two suction pipes (5) and outside the agitation tank (1). A rectangular opening (601) is provided on the side end face of the separation box (6) away from the agitation tank (1). The lower ends of the two return pipes (602) extend to the lower end inside the agitation tank (1). Filter screens (702) are fixedly provided on the lower end face inside the lithium carbonate filter box (7) and the impurity filter box (701).

4. The stirring and washing tank for removing impurities from crude lithium carbonate according to claim 1, characterized in that: The upper end of the washing tank (1) is provided with a feeding port (101) and a liquid injection pipe (102) on both sides. The lower end of the washing tank (1) is fixedly connected with a drain pipe (105). The upper end of the washing tank (1) is fixedly connected with a limiting pipe (103). The limiting pipe (103) is rotatably provided with a rotating shaft (2) inside.

5. The stirring and washing tank for removing impurities from crude lithium carbonate according to claim 4, characterized in that: The lower end of the rotating shaft (2) extends to the lower middle part of the agitation tank (1) and is fixedly connected with a spiral blade (202). Multiple agitator plates (201) are fixedly connected to both sides of the middle part of the rotating shaft (2).

6. The stirring and washing tank for removing impurities from crude lithium carbonate according to claim 4, characterized in that: A drive device (3) is fixedly connected to the middle of the upper end face of the agitation tank (1), and a drive motor (301) is fixedly installed inside the drive device (3).

7. The stirring and washing tank for removing impurities from crude lithium carbonate according to claim 6, characterized in that: The upper end of the rotating shaft (2) extends into the drive device (3) and is fixedly connected to the output shaft of the drive motor (301).

Images