Filtration, washing and drying three-in-one device for lithium carbonate, and production process thereof

Abstract

A filtration, washing and drying three-in-one device for lithium carbonate, and a production process thereof. The device comprises a tank body (1), a motor (2) arranged on the tank body (1), a stirring rod (3) which is arranged at a power output end of the motor (2) and extends into the tank body (1), a stirring blade (13) arranged on the stirring rod (3), and a feeding port (5), a liquid inlet (7), a discharging port (9) and a waste discharging port (11) which are provided on the tank body (1). A spraying liquid delivery pipe (16) connected to the liquid inlet (7) is arranged at the top in the tank body (1); a plurality of spray nozzles (17) are mounted on the spraying liquid delivery pipe (16); and a filtration mechanism is arranged at the bottom in the tank body (1).

Description

A three-in-one equipment for filtering, washing and drying lithium carbonate and its production process Technical Field

[0001] The present invention relates to the technical field of lithium carbonate preparation, in particular to a three-in-one device for filtering, washing and drying lithium carbonate and a production process thereof. Background Art

[0002] Lithium carbonate is an inorganic compound with the chemical formula Li2CO3 and a molecular weight of 73.89. It forms colorless monoclinic crystals, slightly soluble in water and dilute acid, but insoluble in ethanol and acetone. Its thermal stability is lower than that of carbonates of other elements in the periodic table, and it does not deliquesce in air. It can be obtained by adding sodium carbonate to a solution of lithium sulfate or lithium oxide. Its aqueous solution can be converted into an acid salt by bubbling carbon dioxide into it, and hydrolysis occurs upon boiling. Lithium carbonate is used in the manufacture of lithium compounds, enamels, and glass. It is a raw material for the production of lithium compounds and metallic lithium, and can be used as an additive in electrolytic baths for aluminum smelting. It has widespread applications in the glass, ceramics, pharmaceutical, and food industries, as well as in synthetic rubber, dyes, semiconductors, military defense, televisions, atomic energy, pharmaceuticals, and catalysts. However, in the lithium carbonate preparation process, filtration, washing, and drying are often performed separately, resulting in a cumbersome process, large equipment footprint, and frequent manual material handling, resulting in high labor costs. Summary of the Invention

[0003] In response to the problems existing in the prior art, the purpose of the present invention is to provide a three-in-one lithium carbonate filtering, washing and drying equipment and its production process. This three-in-one lithium carbonate filtering, washing and drying equipment and its production process can realize filtering, washing and drying in one, effectively simplifying the process flow, reducing the equipment footprint, and reducing the labor cost caused by material transportation.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions: a three-in-one device for filtering, washing and drying lithium carbonate, comprising a tank body, a motor arranged on the tank body, a stirring rod arranged on the power output end of the motor and extending into the tank body, a stirring blade arranged on the stirring rod, and a feed port, a liquid inlet, a discharge port and a waste discharge port opened on the tank body; a spray infusion pipe connected to the liquid inlet is provided on the top of the tank body, a plurality of spray heads are installed on the spray infusion pipe, and a filtering mechanism is provided at the bottom of the tank body; an annular mounting groove is provided on the inner wall of the tank body, a plurality of electromagnets are embedded on the side walls of the mounting groove, an inner liner with a cylindrical structure with two ends open is sealed and embedded in the mounting groove, and the inner liner The inner wall is flush with the inner wall of the tank body, and an annular closed cavity is formed between the two; the inner tank includes a plurality of fixed heat-conducting rings and a plurality of elastic rings connected in alternating layers, the fixed heat-conducting rings are fixedly installed on the tank body through connectors, a plurality of heat-conducting tubes are arranged around the outer wall of the fixed heat-conducting ring, a plurality of electric heating iron sheets are embedded in the elastic ring in an annular array, the positions of the plurality of electric heating iron sheets correspond one to one with the positions of the plurality of electromagnets, and a heat dissipation fin is provided on the side of the electric heating iron sheet facing the axis of the elastic ring; a pressure regulating tube is provided on one side of the tank body, one end of the pressure regulating tube is connected to the air pressure regulating mechanism, and the other end branches into a plurality of output ends extending into the mounting groove, and the output ends of the pressure regulating tube are distributed at the upper and lower ends of each electromagnet.

[0005] In some embodiments, a lifting mechanism is provided on the tank body, and the motor is provided on the lifting mechanism. Under the driving action of the lifting mechanism, the stirring rod can move up and down along the axial direction inside the tank body.

[0006] In some embodiments, a dust collector is provided on the tank body, and the dust collector is connected to an external dust removal mechanism.

[0007] In some embodiments, the tank body is provided with an air inlet, and the air inlet is externally connected to a nitrogen storage tank.

[0008] In some embodiments, a sampling port is provided on the tank body, and the opening and closing of the sampling port is controlled by a valve.

[0009] In some embodiments, the filtering mechanism includes a supporting mesh plate and a filter cloth detachably disposed on the supporting mesh plate.

[0010] In some embodiments, the spray infusion tube is an annular pipe that surrounds the stirring rod and is arranged close to the inner wall of the tank body.

[0011] In some embodiments, the elastic ring is corrugated.

[0012] A lithium carbonate production process, characterized in that it comprises the following steps:

[0013] S1, injecting a solid-liquid mixture containing lithium carbonate solid and impurities into the tank through the feed port, and allowing it to stand to separate the solid and liquid;

[0014] S2, opening the waste outlet, filtering out the waste liquid in the solid-liquid mixture in step S1 under the filtering action of the filtering mechanism to obtain impurity-containing and moist lithium carbonate solid, at which time the impurity-containing and moist lithium carbonate solid is retained on the filtering mechanism, completing the filtering operation;

[0015] S3, injecting the impurity solvent into the spray infusion pipe through the liquid inlet, and then spraying it outward from the spray head;

[0016] S4, starting the motor, driving the stirring rod and the stirring blades to stir the material, and continuing stirring until the impurities are completely dissolved, then opening the waste outlet to discharge the waste liquid to obtain wet lithium carbonate solid, and the wet lithium carbonate solid is now retained on the filtering mechanism, completing the washing operation;

[0017] S5, introducing a heat medium into the heat conduction pipe, and simultaneously energizing the electric heating iron sheet to generate heat, while keeping the motor turned on, and continuously stirring the material by the stirring blade until the lithium carbonate is completely dried, thereby completing the drying operation;

[0018] S6. Open the discharge port to discharge the material.

[0019] In summary, the present invention has the following beneficial effects:

[0020] This lithium carbonate filtering, washing and drying three-in-one equipment and its production process can realize filtering, washing and drying in one, effectively simplifying the process flow, reducing the equipment footprint, and reducing the labor cost caused by material transportation. The position adjustment of the electric heating iron plate is achieved through electromagnet adsorption and air flow transmission of the voltage regulating tube. During the filtering and washing stages, the electric heating iron plate with heat dissipation fins can be wrapped by an elastic ring to prevent the electric heating iron plate with heat dissipation fins from moisture and corrosion. During the drying stage, the electric heating iron plate can be fully exposed to achieve direct drying of the material. The repeated expansion or contraction of the elastic ring can be controlled to intensify the air flow activity in the tank, especially in the drying stage, which can accelerate the discharge of water, thereby speeding up the drying speed. In addition, the repeated expansion or contraction of the elastic ring can be controlled to shake off the material adhering to the inner tank, avoiding waste due to material adhesion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is an overall structural diagram of the device of the present invention;

[0022] FIG2 is a cross-sectional structural diagram of the tank body of the present invention;

[0023] Figure 3 is an enlarged view of point A in Figure 2 (use scenario 1);

[0024] Figure 4 is an enlarged view of point A in Figure 2 (use scenario 2);

[0025] Figure 5 is an enlarged view of point A in Figure 2 (use scenario three);

[0026] FIG6 is a schematic structural diagram of the inner container of the present invention.

[0027] In the figure: 1. Tank body; 101. Electromagnet; 2. Motor; 3. Stirring rod; 4. Lifting mechanism; 5. Feed inlet; 6. Dust collector; 7. Liquid inlet; 8. Air inlet; 9. Discharge port; 10. Sampling port; 11. Waste outlet; 12. Support legs; 13. Stirring blades; 14. Support mesh; 15. Filter cloth; 16. Spray infusion pipe; 17. Spray head; 18. Mounting slot; 19. Pressure regulating pipe; 20. Inner tank; 2001. Fixed thermal ring; 2002. Connector; 2003. Thermal pipe; 2004. Heating iron sheet; 2005. Heat dissipation fin; 2006. Elastic ring. DETAILED DESCRIPTION

[0028] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0031] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] As shown in Figures 1-6, a three-in-one device for filtering, washing and drying lithium carbonate includes a tank body 1, a motor 2 provided on the tank body 1, a stirring rod 3 provided on the power output end of the motor 2 and extending into the tank body 1, a stirring blade 13 provided on the stirring rod 3, and a feed port 5, a liquid inlet 7, a discharge port 9 and a waste outlet 11 opened on the tank body 1. The tank body 1 can be supported and placed on the ground by multiple legs 12. The diameter of the tank body 1 is preferably controlled within 3.6 meters.

[0033] The top of the tank body 1 is provided with a spray infusion pipe 16 connected to the liquid inlet 7, and a plurality of spray heads 17 are installed on the spray infusion pipe 16. A filtering mechanism is provided at the bottom of the tank body 1. An annular mounting groove 18 is provided on the inner wall of the tank body 1. A plurality of electromagnets 101 are embedded on the side walls of the mounting groove 18. An inner liner 20 with a cylindrical structure with two ends open is sealed and embedded in the mounting groove 18. The inner wall of the inner liner 20 is flush with the inner wall of the tank body 1, and an annular closed cavity is formed between the two. The inner liner 20 includes a plurality of fixed heat-conducting rings 2001 and a plurality of elastic rings 2006 connected alternately in layers. The fixed heat-conducting ring 2001 is connected by Component 2002 is fixedly installed on the tank body 1, and a number of heat-conducting tubes 2003 are arranged around the outer wall of the fixed heat-conducting ring 2001. A plurality of electric heating iron sheets 2004 are embedded in a circular array on the elastic ring 2006. The positions of the plurality of electric heating iron sheets 2004 correspond one-to-one to the positions of the plurality of electromagnets 101. A heat dissipation fin 2005 is provided on the side of the electric heating iron sheet 2004 facing the axis of the elastic ring 2006; a pressure-regulating tube 19 is provided on one side of the tank body 1, one end of the pressure-regulating tube 19 is connected to the air pressure regulating mechanism, and the other end is branched into a plurality of output ends extending into the mounting groove 18, and the output ends of the pressure-regulating tube 19 are distributed at the upper and lower ends of each electromagnet 101.

[0034] In order to speed up the heat transfer of the electric heating iron sheet 2004, the present application sets a heat dissipation fin 2005 on the electric heating iron sheet 2004. The heat dissipation fin 2005 is generally a metal sheet, which is easily corroded and damaged in a humid environment and under long-term contact with chemical reagents. However, if the electric heating iron sheet 2004 is not provided with the heat dissipation fin 2005, its heat transfer efficiency will be greatly reduced. Therefore, through the above technical solution, the present application also proposes a technical solution for protecting the heat dissipation fin 2005. In the lithium carbonate preparation process, filtration and washing will create a humid environment with a high concentration of chemical reagents. Therefore, In these two processes, the inner tank 20 can be set to the state shown in Figure 4. Specifically, the electromagnet 101 is powered on. At this time, the electromagnet 101 firmly adsorbs the electric heating iron sheet 2004. Then, the air pressure regulating mechanism connected to the pressure regulating tube 19 is started to pressurize the inside of the installation groove 18. At this time, all output ends of the pressure regulating tube 19 are synchronously inflated into the installation groove 18, so that the elastic rings 2006 located at the upper and lower ends of the electric heating iron sheet 2004 bulge in the direction of approaching each other until they fit together (as shown in Figure 4). At this time, the elastic ring 2006 presses the electric heating iron sheet 2004 with the heat dissipation fins 2005. One side is completely wrapped, thereby isolating the heat dissipating fins 2005 from the space inside the tank body 1, thereby protecting the heat dissipating fins 2005, protecting the heat dissipating fins 2005 from moisture and corrosion, and keeping the heat dissipating fins 2005 dry to avoid additional heat loss; and in the drying process, the humidity and the concentration of chemical reagents in the tank body 1 are greatly reduced. At this time, in order to allow the electric heating iron sheet 2004 to conduct heat to the material more directly, the electric heating iron sheet 2004 can be directly exposed to the space inside the tank body 1. Specifically, the electromagnet 101 is powered off. At this time, the electromagnet 101 is not Then the electric heating iron sheet 2004 is adsorbed, so that at this time, under the action of the elastic recovery of the elastic ring 2006, the electric heating iron sheet 2004 is quickly reset and restored to the state shown in Figure 3. At this time, the heat dissipation fins 2005 are directly exposed to the internal space of the tank body 1, achieving efficient heat conduction to the material; the repeated expansion or contraction of the elastic ring 2006 can also be controlled to intensify the air flow activity in the tank body 1, especially in the drying stage, which can accelerate the discharge of moisture, thereby accelerating the drying speed, and the repeated expansion or contraction of the elastic ring 2006 can be controlled to shake off the material adhering to the inner liner 20.

[0035] In some embodiments, as shown in FIG1 , a lifting mechanism 4 is provided on the tank body 1, and a motor 2 is provided on the lifting mechanism 4. Driven by the lifting mechanism 4, the stirring rod 3 can move up and down along the axis inside the tank body 1, so that the stirring blade 13 can stir the material from shallow to deep, thereby achieving more sufficient stirring.

[0036] In some embodiments, as shown in FIG1 , a dust collector 6 is provided on the tank body 1 , and the dust collector 6 is externally connected to a dust removal mechanism for collecting dust to avoid polluting the environment.

[0037] In some embodiments, as shown in FIG1 , an air inlet 8 is provided on the tank body 1 , and the air inlet 8 is externally connected to a nitrogen storage tank, thereby allowing nitrogen to be input into the tank body 1 to achieve inerting of the internal environment of the tank body 1 .

[0038] In some embodiments, as shown in FIG1 , a sampling port 10 is provided on the tank body 1 , and the opening and closing of the sampling port 10 is controlled by a valve. The material can be sampled through the sampling port 10 to analyze whether the process is completed.

[0039] In some embodiments, as shown in FIG2 , the filtering mechanism includes a supporting mesh plate 14 and a filter cloth 15 detachably disposed on the supporting mesh plate 14 to ensure that the filter cloth 15 can be replaced at will.

[0040] In some embodiments, as shown in FIG. 2 , the spray infusion pipe 16 is an annular pipe that surrounds the stirring rod 3 and is disposed close to the inner wall of the tank body 1 , which can effectively improve the spraying uniformity.

[0041] In some embodiments, as shown in FIG. 6 , the elastic ring 2006 is corrugated. The elastic ring 2006 with this structure has a longer tensile length, thereby reducing the requirements on the material of the elastic ring 2006 .

[0042] A lithium carbonate production process, characterized in that it comprises the following steps:

[0043] S1, injecting a solid-liquid mixture containing lithium carbonate solid and impurities into the tank body 1 through the feed port 5, and allowing it to stand to separate the solid and liquid;

[0044] S2, open the waste outlet 11, under the filtering action of the filtering mechanism, filter out the waste liquid in the solid-liquid mixture in step S1 to obtain impurity-containing and moist lithium carbonate solid, at this time, the impurity-containing and moist lithium carbonate solid is retained on the filtering mechanism, completing the filtering operation;

[0045] S3, inject the impurity solvent into the spray infusion pipe 16 through the liquid inlet 7, and then spray it outward from the spray head 17;

[0046] S4, start the motor 2, drive the stirring rod 3 and the stirring blade 13 by the motor 2 to stir the material, and continue stirring until the impurities are completely dissolved, and then open the waste outlet 11 to discharge the waste liquid to obtain wet lithium carbonate solid. At this time, the wet lithium carbonate solid is retained on the filter mechanism, completing the washing operation;

[0047] S5. A heat medium is introduced into the heat pipe 2003. The heat medium can be hot steam or steam condensed water generated by the evaporator in the workshop. The waste heat of the condensed water is used to generate heat. At the same time, the electric heating iron sheet 2004 is energized to generate heat. At the same time, the motor 2 is kept on and the material is continuously stirred by the stirring blade 13 until the lithium carbonate is completely dried. The drying operation is completed.

[0048] S6, open the discharge port 9 to discharge the material.

[0049] Through the above technical solution, the lithium carbonate filtering, washing and drying three-in-one equipment can realize filtering, washing and drying, effectively simplifying the process flow, reducing the equipment footprint, and reducing the labor cost caused by material transportation. The position adjustment of the electric heating iron sheet 2004 is achieved through the adsorption of the electromagnet 101 and the air flow transmission of the voltage regulating tube 19. In the filtering and washing stages, the electric heating iron sheet 2004 with the heat dissipating fins 2005 can be wrapped by the elastic ring 2006 to prevent the electric heating iron sheet 2004 with the heat dissipating fins 2005 from being damp and corroded. In the drying stage, the electric heating iron sheet 2004 can be fully exposed to achieve direct drying of the material, and by controlling The repeated expansion or contraction of the elastic ring 2006 can intensify the air flow activity in the tank body 1, especially in the drying stage, which can accelerate the discharge of water, thereby speeding up the drying speed. Moreover, the repeated expansion or contraction of the elastic ring 2006 can shake off the material adhering to the inner liner 20, thereby avoiding waste due to material adhesion. In addition, the entire process adopts PLC control to realize automated production, and the diameter of the tank body 1 of the equipment does not exceed 3.6 meters, which greatly reduces the footprint. The equipment power is 55KW, and the waste heat of steam condensate generated by the evaporator in the production workshop can be used to dry lithium carbonate, which can greatly reduce energy consumption. Compared with traditional equipment, it can save 8-9 million yuan in electricity bills each year.

[0050] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A three-in-one equipment for filtering, washing and drying lithium carbonate, characterized by: It comprises a tank body (1), a motor (2) arranged on the tank body (1), a stirring rod (3) arranged on the power output end of the motor (2) and extending into the tank body (1), a stirring blade (13) arranged on the stirring rod (3), and a feed port (5), a liquid inlet (7), a discharge port (9), and a waste outlet (11) opened on the tank body (1); A spray infusion pipe (16) connected to the liquid inlet (7) is provided at the top of the tank body (1), a plurality of spray heads (17) are installed on the spray infusion pipe (16), and a filtering mechanism is provided at the bottom of the tank body (1); An annular mounting groove (18) is provided on the inner wall of the tank body (1), a plurality of electromagnets (101) are embedded in the side wall of the mounting groove (18), an inner liner (20) with a cylindrical structure and open at both ends is sealed and embedded in the mounting groove (18), the inner wall of the inner liner (20) is flush with the inner wall of the tank body (1), and an annular closed cavity is formed between the two. The inner liner (20) comprises a plurality of fixed heat-conducting rings (2001) and a plurality of elastic rings (2006) connected in alternating layers, the fixed heat-conducting rings (2001) being fixedly mounted on the tank body (1) via a connector (2002), a plurality of heat-conducting tubes (2003) being arranged around and fitted on the outer wall of the fixed heat-conducting ring (2001), a plurality of electric heating iron sheets (2004) being embedded in a circular array on the elastic ring (2006), the positions of the plurality of electric heating iron sheets (2004) corresponding to the positions of the plurality of electromagnets (101) being one-to-one, and a heat dissipation fin (2005) being arranged on one side of the electric heating iron sheet (2004) facing the axis of the elastic ring (2006); A pressure regulating tube (19) is provided on one side of the tank body (1), one end of the pressure regulating tube (19) is connected to the air pressure regulating mechanism, and the other end is branched into a plurality of output ends extending into the mounting groove (18), and the output ends of the pressure regulating tube (19) are distributed at the upper and lower ends of each electromagnet (101).

2. A three-in-one lithium carbonate filtering, washing and drying device according to claim 1, characterized in that: The tank body (1) is provided with a lifting mechanism (4), and the motor (2) is provided on the lifting mechanism (4). Under the driving action of the lifting mechanism (4), the stirring rod (3) can move up and down along the axial direction inside the tank body (1).

3. The lithium carbonate filtering, washing and drying three-in-one equipment according to claim 1, characterized in that: The tank body (1) is provided with a dust collector (6), and the dust collector (6) is externally connected to a dust removal mechanism.

4. The three-in-one equipment for filtering, washing and drying lithium carbonate according to claim 1, characterized in that: The tank body (1) is provided with an air inlet (8), and the air inlet (8) is externally connected to a nitrogen storage tank.

5. The lithium carbonate filtering, washing and drying three-in-one equipment according to claim 1, characterized in that: The tank body (1) is provided with a sampling port (10), and the opening and closing of the sampling port (10) is controlled by a valve.

6. The three-in-one equipment for filtering, washing and drying lithium carbonate according to claim 1, characterized in that: The filtering mechanism comprises a supporting mesh plate (14) and a filter cloth (15) detachably arranged on the supporting mesh plate (14).

7. The lithium carbonate filtering, washing and drying three-in-one equipment according to claim 1, characterized in that: The spray infusion pipe (16) is an annular pipe, which surrounds the stirring rod (3) and is arranged close to the inner wall of the tank body (1).

8. The three-in-one equipment for filtering, washing and drying lithium carbonate according to claim 1, characterized in that: The elastic ring (2006) is corrugated.

9. A lithium carbonate production process based on the lithium carbonate filtering, washing and drying three-in-one equipment according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, injecting a solid-liquid mixture containing lithium carbonate solid and impurities into the tank (1) through the feed port (5), and allowing the mixture to stand to separate the solid and liquid; S2, opening the waste outlet (11), filtering out the waste liquid in the solid-liquid mixture in step S1 under the filtering action of the filtering mechanism, and obtaining impurity-containing and moist lithium carbonate solids. At this time, the impurity-containing and moist lithium carbonate solids are retained on the filtering mechanism, completing the filtering operation; S3, injecting the impurity solvent into the spraying liquid infusion pipe (16) through the liquid inlet (7), and then spraying it outward from the spray head (17); S4, starting the motor (2), driving the stirring rod (3) and the stirring blade (13) through the motor (2) to stir the material, and continuing stirring until the impurities are completely dissolved, and then opening the waste outlet (11) to discharge the waste liquid to obtain wet lithium carbonate solid. At this time, the wet lithium carbonate solid is retained on the filtering mechanism, completing the washing operation; S5, introducing a heat medium into the heat conducting pipe (2003), and simultaneously energizing the electric heating iron sheet (2004) to generate heat, while keeping the motor (2) in an on state, and continuously stirring the material through the stirring blade (13) until the lithium carbonate is completely dried, thereby completing the drying operation; S6, opening the discharge port (9) to discharge the material.

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