Lithium carbonate washing device

Abstract

The utility model discloses a lithium carbonate washing device which comprises a box type conveying device, a lithium carbonate slurry pipeline, a lithium carbonate slurrying tank, a material transferring pump and a spiral screen centrifugal machine, the box type conveying device comprises a box type filtering belt, a plurality of carrier rollers and two reversing wheels; a plurality of deionized water nozzles are arranged above the box type conveying device; a plurality of vacuumizing devices are arranged in the box type conveying device; a lithium carbonate pulping tank discharging groove is formed in one end of the box type conveying device; a fan-shaped deionized water high-pressure nozzle is arranged at the upper part of the lithium carbonate pulping tank blanking groove, and the lower part is connected with a lithium carbonate pulping tank; and the lithium carbonate pulping tank is connected with the spiral screen centrifugal machine through the transfer pump. According to the lithium carbonate washing device, the novel box type filtering belt is adopted as a filtering and conveying tool, high-pressure washing and stripping are carried out on lithium carbonate for many times in the conveying process, the problems of soluble impurities and viscosity are solved, and the whole device is relatively simple in structure and more suitable for actual production.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium carbonate production equipment, in particular to a lithium carbonate washing device. Background Art

[0002] Lithium carbonate is an inorganic compound composed of lithium ions and carbonate ions. It is a colorless monoclinic crystal, slightly soluble in water and dilute acid, and insoluble in ethanol and acetone. Its thermal stability is lower than that of carbonates of other elements in the same group in the periodic table. It does not deliquesce in the air and can be obtained by adding sodium carbonate to lithium sulfate or lithium oxide solution. Its aqueous solution can be converted into an acid salt by passing carbon dioxide into it, and hydrolysis occurs when it is boiled. Lithium carbonate is an important lithium compound that plays an important role in various applications. It is currently widely used in glass and ceramic manufacturing, electronics, optical materials, medicine, non-ferrous metal smelting, lithium battery electrode materials and other fields.

[0003] With the rapid development of new energy technology and the lithium battery industry, the demand for high-quality lithium carbonate is increasing day by day. At present, the main lithium carbonate purification processes include carbonization, electrolysis, extraction, ion exchange, adsorption, etc. Among them, the carbonization method has become the mainstream process for lithium carbonate production because of its high reaction efficiency, simple process, strong operability, low cost, and low pollution. Due to the physical properties of lithium carbonate itself, it basically exists in the form of precipitation in these processes, and the slurry produced after the reaction also contains other soluble impurities. In order to remove the soluble impurities in lithium carbonate, technicians have disclosed some solutions. For example, patent CN110902701A discloses a device for washing lithium carbonate, which includes a filtering pulp washing and crushing system and a centrifugal washing system. Its process is a multi-stage washing process of plate and frame filter press-pulping-crushing-centrifugal washing. Each step in its process is also a multi-stage washing process. The multi-stage device can significantly reduce the content of soluble impurities in lithium carbonate, but it will also make the device structure complicated and the overall flow The process is cumbersome; in addition, patent CN117086017A discloses a device for washing lithium carbonate, which includes a cleaning bucket and a support frame, etc. The cleaning bucket is connected to the middle of the support frame, and the cleaning bucket has a water outlet valve on the lower right side. It also includes a stirring component, a scraping mechanism and a cleaning mechanism. The lower side of the cleaning bucket is provided with a stirring component, and the cleaning bucket is provided with a stirring component. The stirring component is provided with a scraping mechanism, and the scraping mechanism is provided with a cleaning mechanism. The washing device solves the blockage problem of the circular holes of the sieve cylinder by using a corresponding scraping mechanism, but the motor shaft of the device penetrates into the barrel from the bottom, which has high requirements for sealing, and it is also difficult to inspect and repair when leaking, and its internal structure is complicated and not suitable for actual production.

[0004] To solve the above problems, it is considered to introduce a new belt washing to simplify the multiple devices of multi-stage washing, and combine suction, relative motion, a new type of cassette filter belt and high-pressure flushing stripping to solve the problems of filtering soluble impurities and viscosity of lithium carbonate, and use a centrifuge to achieve the final cleaning of lithium carbonate. Utility Model Content

[0005] The purpose of this utility model is to provide a lithium carbonate washing device to solve the above-mentioned shortcomings, to solve the problem of filtering soluble impurities and viscosity of lithium carbonate, to purify lithium carbonate, with a simple structure, and to be more applicable in actual production. To achieve the above-mentioned purpose, this utility model provides the following technical solutions:

[0006] A lithium carbonate washing device comprises a cassette conveying device, a lithium carbonate slurry pipeline, a lithium carbonate pulping tank, a transfer pump and a spiral screen centrifuge; the lithium carbonate slurry pipeline is used to transport the lithium carbonate slurry to the cassette conveying device; the cassette conveying device comprises a cassette filter belt, a plurality of rollers and two reversing wheels; the two reversing wheels are respectively located on both sides of the cassette conveying device; the rollers and the reversing wheels are wrapped with the cassette filter belt; a plurality of deionized water nozzles are arranged above the cassette conveying device; a lithium carbonate pulping tank discharge trough is arranged at one end of the cassette conveying device; a deionized water fan-shaped high-pressure nozzle is arranged on the upper part of the lithium carbonate pulping tank discharge trough, and the lower part is connected to the lithium carbonate pulping tank; the lithium carbonate pulping tank is connected to the spiral screen centrifuge through a transfer pump.

[0007] Furthermore, the cassette filter belt is composed of a first slotted belt, a second slotted belt, a first filter cloth and a second filter cloth; the first filter cloth, the first slotted belt, the second filter cloth and the second slotted belt are arranged in sequence from top to bottom; the first slotted belt and the second slotted belt are each provided with a plurality of openings; the openings on the first slotted belt and the openings on the second slotted belt are arranged alternately.

[0008] Furthermore, a plurality of vacuum devices are provided in the box-type conveying device; the vacuum devices are located below the upper box-type filtering belt; and the vacuum devices are connected to the storage device.

[0009] Furthermore, a liquid collecting tank is provided in the box-type conveying device; the liquid collecting tank is located below the upper box-type filter belt; and a liquid collecting tank support is connected to the lower part of the liquid collecting tank.

[0010] Furthermore, a heat-insulating cover is provided above the box-type conveying device; the heat-insulating cover is covered above the upper box-type filtering belt to prevent heat loss during the filtering process.

[0011] Furthermore, a liquid and slag collecting trough is provided below the box-type conveying device; a liquid and slag collecting trough grid is provided in the liquid and slag collecting trough; and a liquid and slag collecting stirring tank is provided at the bottom of the liquid and slag collecting trough.

[0012] The beneficial effects of the utility model are:

[0013] The utility model discloses a lithium carbonate washing device, which belongs to the technical field of lithium carbonate production equipment, and comprises a cassette conveying device, a lithium carbonate slurry pipeline, a lithium carbonate pulping tank, a transfer pump and a spiral screen centrifuge; the lithium carbonate slurry pipeline is used to transport the lithium carbonate slurry to the cassette conveying device; the cassette conveying device comprises a cassette filter belt, a plurality of rollers and two reversing wheels; the reversing wheels are respectively located on both sides of the entire cassette conveying device; the rollers and the reversing wheels are wrapped with the cassette filter belt; a plurality of deionized water nozzles are arranged above the cassette conveying device; a plurality of vacuum pumping devices are arranged in the cassette conveying device; a lithium carbonate pulping tank discharge trough is arranged on the right side of the cassette conveying device; a deionized water fan-shaped high-pressure nozzle is arranged on the upper part of the lithium carbonate pulping tank discharge trough, and the lower part is connected with the lithium carbonate pulping tank; the lithium carbonate pulping tank is connected with the spiral screen centrifuge through the transfer pump. The lithium carbonate washing device of the utility model adopts a new cassette filter belt as a filtering and conveying tool, and implements multiple high-pressure washing and stripping of lithium carbonate during transportation to solve the problems of soluble impurities and viscosity. The structure of the entire device is relatively simple and more suitable for actual production. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the cassette filter belt of the utility model;

[0016] Figure 3 It is a schematic diagram of the top view of the liquid collecting tank of the utility model;

[0017] In the accompanying drawings: 1-lithium carbonate slurry pipeline, 2-lithium carbonate pulping tank, 3-transfer pump, 4-spiral screen centrifuge, 5-cassette filter belt, 6-roller, 7-reversing wheel, 8-deionized water nozzle, 9-vacuum extraction device, 10-deionized water fan-shaped high-pressure nozzle, 11-first slotted belt, 12-second slotted belt, 13-first filter cloth, 14-second filter cloth, 15-liquid collecting tank, 16-insulation cover, 17-liquid collecting slag collecting tank, 18-liquid collecting slag collecting tank grid, 19-lithium carbonate pulping tank unloading trough, 20-liquid collecting tank support, 21-liquid collecting slag collecting stirring tank, 22-thermometer. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods, but the present invention is not limited to the following embodiments.

[0019] Embodiment 1:

[0020] Attached Figures 1 to 3A lithium carbonate washing device comprises a cassette conveying device, a lithium carbonate slurry pipeline 1, a lithium carbonate pulping tank 2, a transfer pump 3 and a spiral screen centrifuge 4; the lithium carbonate slurry pipeline 1 is used to transport the lithium carbonate slurry to the cassette conveying device; the cassette conveying device comprises a cassette filter belt 5, a plurality of rollers 6 and two reversing wheels 7; the two reversing wheels 7 are respectively located on both sides of the cassette conveying device; the rollers 6 and the reversing wheels 7 are wrapped with the cassette filter belt 5; a plurality of deionized water nozzles 8 are arranged above the cassette conveying device; a lithium carbonate pulping tank discharge trough 19 is arranged at one end of the cassette conveying device; a deionized water fan-shaped high-pressure nozzle 10 is arranged on the upper part of the lithium carbonate pulping tank discharge trough 19, and the lower part is connected to the lithium carbonate pulping tank 2; the lithium carbonate pulping tank 2 is connected to the spiral screen centrifuge 4 through the transfer pump 3. As can be seen from the above structure, the cassette conveyor device includes a cassette filter belt 5, a plurality of rollers 6 and two reversing wheels 7. The cassette filter belt 5 is wrapped around the outer sides of the rollers 6 and the two reversing wheels 7. The rollers 6 and the reversing wheels 7 both support the cassette filter belt 5. The two reversing wheels 7 are respectively located on the left and right sides. The entire cassette filter belt 5 forms a closed loop. The reversing wheels 7 are externally connected to a driving device, which is used to drive the reversing wheels 7 to rotate, thereby driving the filter belt to move. The lithium carbonate slurry flows into the cassette filter belt 5 through the lithium carbonate slurry pipeline 1. The cassette filter belt 5 can perform a preliminary filtration on the lithium carbonate slurry. A plurality of deionized water nozzles 8 are arranged above the cassette conveyor device. The deionized water nozzles 8 can be arranged equidistantly. The deionized water sprayed by the deionized water nozzles 8 rinses the lithium carbonate slurry. A plurality of deionized water nozzles 8 can be arranged to rinse the lithium carbonate slurry multiple times. A lithium carbonate pulping tank discharge trough 19 is provided at one end of the cassette conveyor device, as shown in the figure, and can be arranged on the left side of the cassette conveyor device. At this time, the cassette filter belt 5 rotates clockwise, and a deionized water fan-shaped high-pressure nozzle 10 is fixed on the upper part of the lithium carbonate pulping tank discharge trough 19. The nozzle outlet of the deionized water fan-shaped high-pressure nozzle 10 faces the cassette filter belt 5 near the reversing wheel 7. Deionized water is sprayed through the deionized water fan-shaped high-pressure nozzle 10 to rinse and peel off the washed lithium carbonate slurry on the cassette filter belt 5. The lithium carbonate slurry separated from the cassette filter belt 5 enters the lithium carbonate pulping tank 2 through the lithium carbonate pulping tank discharge trough 19. After being evenly stirred in the lithium carbonate pulping tank 2, it is transferred to the spiral screen centrifuge 4 by the transfer pump 3 for final centrifugal washing, so that the residual soluble impurities can be removed more thoroughly. Among them, a thermometer 22 can also be set in the lithium carbonate pulping tank 2 to monitor the temperature of the lithium carbonate slurry in real time. According to the temperature change (basically the temperature drops), an appropriate amount of deionized water is added to maintain the material temperature. Insulation cotton can also be set outside the lithium carbonate pulping tank 2 to prevent heat loss. When the temperature of the lithium carbonate slurry is maintained at about 80°C, the solubility of lithium carbonate decreases while the solubility of other soluble impurities is higher.The lithium carbonate washing device of the utility model adopts a new cassette filter belt 5 as a container and filtering and conveying tool for materials to achieve multiple washing of lithium carbonate slurry, and adopts high-pressure washing and stripping to solve the problem of filtering soluble impurities and viscosity of lithium carbonate, and finally uses a centrifuge to achieve final cleaning, so as to achieve the purpose of purifying lithium carbonate. The structure of the whole device is relatively simple and more suitable for actual production.

[0021] The cassette filter belt 5 is in the shape of a long groove with an opening at the top; the bottom of the cassette filter belt 5 is composed of a first slotted belt 11, a second slotted belt 12, a first filter cloth 13 and a second filter cloth 14; the first filter cloth 13, the first slotted belt 11, the second filter cloth 14 and the second slotted belt are arranged in sequence from top to bottom; the first slotted belt 11 and the second slotted belt are each provided with a plurality of openings; the openings on the first slotted belt 11 and the openings on the second slotted belt are arranged alternately. As can be seen from the above structure, the shape of the cassette filter belt 5 is a long groove, with an opening at the top, and the bottom is composed of the first slotted belt 11, the second slotted belt 12, the first filter cloth 13 and the second filter cloth 14. The top layer is the first filter cloth 13, and from top to bottom, they are the first slotted belt 11, the second filter cloth 14 and the second slotted belt. The mesh number of the first filter cloth 13 and the second filter cloth 14 can be selected according to actual conditions. The first slotted belt 11 and the second slotted belt are both provided with a number of equidistant rectangular openings. The openings of the first slotted belt 11 and the second slotted belt are arranged in a staggered manner, such as the openings of the first slotted belt 11 are arranged along the width direction, and the openings of the second slotted belt are arranged along the length direction. In this way, when the deionized water flows through the cassette filter belt 5, it is from top to bottom and in an inclined state, which improves the washing effect. It can be seen that the cassette filter belt 5 of the utility model not only serves as a container for lithium carbonate slurry during the conveying process, but also plays a filtering role on the lithium carbonate slurry.

[0022] Embodiment 2:

[0023] See attached Figures 1 to 3 On the basis of the first embodiment, the cassette conveyor device is provided with a plurality of vacuum devices 9; the vacuum devices 9 are located below the upper cassette filter belt 5; the vacuum devices 9 are connected to a storage device. As can be seen from the above structure, a plurality of vacuum devices 9 are provided below the cassette filter belt 5 located on the upper side of the cassette conveyor device, which can be like Figure 1As shown in the figure, three vacuum devices 9 are arranged equidistantly, respectively located between two rollers 6 and in contact with but not connected to the cassette filter belt 5. The vacuum device 9 can accelerate the deionized water in the cassette filter belt 5 to pass through the lithium carbonate slurry from top to bottom by rapid vacuuming, thereby strengthening the washing of lithium carbonate. The filtrate of washed lithium carbonate enters the storage device connected to the vacuum device 9 for recycling. Arranging multiple vacuum devices 9 can realize multi-stage suction. Every time the lithium carbonate slurry on the cassette filter belt 5 passes through the vacuum device 9, the deionized water can be accelerated to flow through the lithium carbonate slurry by vacuuming, thereby improving the washing effect of the lithium carbonate.

[0024] The cassette conveyor device is provided with a liquid collecting tank 15; the liquid collecting tank 15 is located below the upper cassette filter belt 5; the lower part of the liquid collecting tank 15 is connected to a liquid collecting tank support 20. As can be seen from the above structure, a liquid collecting tank 15 is further provided below the cassette filter belt 5 located on the upper side of the cassette conveyor device, the top of the liquid collecting tank 15 is in contact with the belt but not connected, and a liquid collecting tank support 20 is provided at the bottom. The liquid collecting tank 15 is used to collect the filtrate dripping from the cassette filter belt 5, and the collected filtrate is used for subsequent recycling.

[0025] Embodiment three:

[0026] See attached Figures 1 to 3 . On the basis of the second embodiment, a heat preservation cover 16 is provided on the top of the cassette conveying device; the heat preservation cover 16 covers the top of the upper cassette filter belt 5 to prevent heat loss during the filtering process. As can be seen from the above structure, a heat preservation cover 16 is provided on the top of the cassette conveying device, and the heat preservation cover 16 covers the top of the upper cassette filter belt 5. The heat preservation cover 16 can prevent heat loss, reduce the water vapor from escaping and taking away heat, and ensure that the internal pressure is slightly higher than the atmospheric pressure to prevent the outside air from entering and interfering with the material. At the same time, it is also to ensure the safety of the personnel on duty.

[0027] A liquid collecting slag collecting tank 17 is provided below the cassette conveyor device; a liquid collecting slag collecting tank grid 18 is provided in the liquid collecting slag collecting tank 17; and a liquid collecting slag collecting stirring tank 21 is provided at the bottom of the liquid collecting slag collecting tank 17. As can be seen from the above structure, a liquid collecting slag collecting tank 17 is provided below the cassette conveyor device. When the residues of the lithium carbonate slurry left on the cassette filter belt 5 after washing, filtering and stripping rotate to the lower part with the cassette filter belt 5, the residues enter the liquid collecting slag collecting tank 17 under the action of their own weight. A liquid collecting slag collecting tank grid 18 is provided in the liquid collecting slag collecting tank 17. The liquid collecting slag collecting tank grid 18 is in a grid shape and is used to prevent large foreign objects in the residues from entering. After passing through the liquid collecting slag collecting tank 17, the residues enter the liquid collecting slag collecting stirring tank 21 for storage so as to be reused later.

[0028] Working process of the sealing device of the utility model:

[0029] As shown in the figure, three deionized water nozzles and three vacuum devices are respectively arranged in the lithium carbonate washing device. The lithium carbonate slurry enters the cassette filter belt through the lithium carbonate slurry pipeline and moves as the cassette filter belt rotates clockwise. The first vacuum device is arranged at a position corresponding to the outlet of the lithium carbonate slurry pipeline. When the lithium carbonate slurry enters the cassette filter belt, the vacuum device performs the first vacuuming to accelerate the primary filtration, and the generated filtrate is sucked by the vacuum device to the storage device for recycling. Subsequently, the lithium carbonate slurry moves as the cassette filter belt rotates clockwise, and the deionized water nozzle above the cassette filter belt sprays deionized water to rinse it, and then the vacuum device accelerates the filtration, and the generated filtrate is sucked by the vacuum device to the storage device for recycling. When it moves to the reversing wheel on the left, the fan-shaped high-pressure nozzle of deionized water strips the filtered lithium carbonate slurry. The unloading trough of the lithium carbonate pulping tank can prevent the lithium carbonate slurry from splashing around during stripping. Then the lithium carbonate slurry enters the lithium carbonate pulping tank and is transferred to the spiral screen centrifuge by the transfer pump for centrifugal washing to ensure that the remaining soluble impurities are completely removed. When the cassette filter belt rotates to the lower side of the entire device, the remaining liquid slag falls into the liquid and slag collecting mixing tank through the liquid and slag collecting trough under the action of gravity, and is then recycled.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the patent scope of the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A lithium carbonate washing device, comprising a cassette conveying device, a lithium carbonate slurry pipeline (1), a lithium carbonate slurry tank (2), a material transfer pump (3) and a spiral screen centrifuge (4); the lithium carbonate slurry pipeline (1) is used to transport the lithium carbonate slurry to the cassette conveying device; characterized in that: The cassette conveyor device comprises a cassette filter belt (5), a plurality of rollers (6) and two reversing wheels (7); the two reversing wheels (7) are respectively located on both sides of the cassette conveyor device; the rollers (6) and the reversing wheels (7) are wrapped with the cassette filter belt (5); a plurality of deionized water nozzles (8) are arranged above the cassette conveyor device; a lithium carbonate pulping tank discharge trough (19) is arranged at one end of the cassette conveyor device; a deionized water fan-shaped high-pressure nozzle (10) is arranged at the upper part of the lithium carbonate pulping tank discharge trough (19), and the lower part is connected to the lithium carbonate pulping tank (2); the lithium carbonate pulping tank (2) is connected to the spiral screen centrifuge (4) through a transfer pump (3).

2. A lithium carbonate washing device according to claim 1, characterized in that: The cassette filter belt is in the shape of a long groove with an opening at the top; the bottom of the cassette filter belt (5) is composed of a first slotted belt (11), a second slotted belt (12), a first filter cloth (13) and a second filter cloth (14); the first filter cloth (13), the first slotted belt (11), the second filter cloth (14) and the second slotted belt (12) are arranged in sequence from top to bottom; the first slotted belt (11) and the second slotted belt (12) are both provided with a plurality of openings; the openings on the first slotted belt (11) and the openings on the second slotted belt (12) are arranged in a staggered manner.

3. A lithium carbonate washing device according to claim 2, characterized in that: A plurality of vacuum devices (9) are arranged in the box-type conveying device; the vacuum devices (9) are located below the upper box-type filtering belt (5); and the vacuum devices (9) are connected to a storage device.

4. A lithium carbonate washing device according to claim 3, characterized in that: A liquid collecting tank (15) is provided in the box-type conveying device; the liquid collecting tank (15) is located below the upper box-type filter belt (5); and a liquid collecting tank support (20) is connected to the lower part of the liquid collecting tank (15).

5. A lithium carbonate washing device according to any one of claims 1 to 4, characterized in that: A heat-insulating cover (16) is provided above the cassette conveying device; the heat-insulating cover (16) covers the upper cassette filtering belt (5) to prevent heat loss during the filtering process.

6. A lithium carbonate washing device according to claim 5, characterized in that: A liquid and slag collecting trough (17) is provided below the box-type conveying device; a liquid and slag collecting trough grid (18) is provided in the liquid and slag collecting trough (17); and a liquid and slag collecting stirring tank (21) is provided at the bottom of the liquid and slag collecting trough (17).

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