Device for recovering lithium in lithium exchange waste liquid

Abstract

The utility model discloses a device for recovering lithium in lithium exchange waste liquid, which comprises an ethanol dissolving tank, the ethanol dissolving tank comprises a tank body, a filter plate is arranged in the tank body, the position of the filter plate is close to the bottom of the tank body, the shape of the filter plate is a cone with an upward tip part, a solid discharge port is arranged on the side surface of the tank body, and the solid discharge port is communicated with the tank body. The lower edge of the solid discharge port is flush with the upper edge of the filter plate, a gate is mounted at the solid discharge port, a shell is mounted at the top of the tank body, a stirring shaft is rotationally mounted at the top of an inner cavity of the tank body, and the top end of the stirring shaft penetrates through the bottom of the shell; according to the device, a second motor is arranged to drive a rotating shaft to rotate, so that the rotating shaft drives a push plate to rotate, and then the rotating push plate is matched with a conical filter plate, so that solids on the filter plate can be pushed to a solid discharge port of the tank body, the filtered solids are automatically discharged out of the tank body, the labor intensity of workers is reduced, and the working efficiency is improved. And the cleaning efficiency of the filter plate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium recovery from lithium exchange liquid, in particular to a device for recovering lithium from lithium exchange waste liquid. Background Art

[0002] Industrial production of lithium-containing X molecular sieves typically utilizes an aqueous exchange method. The exchange wastewater generated during preparation contains a large amount of lithium ions. To reduce the production cost of lithium-containing X molecular sieves, it is often necessary to recover the lithium from the exchange wastewater. Existing lithium recovery methods involve first obtaining a solid containing lithium chloride, sodium chloride, potassium chloride, and other impurities through evaporation, crystallization, and centrifugation. The lithium chloride in the solid is then dissolved with ethanol. Finally, the ethanol and lithium chloride are separated by distillation to recover the lithium chloride. Existing ethanol dissolution is typically performed in a specialized mixing tank, which contains a filter plate. After the lithium chloride is dissolved in ethanol, it is separated from the sodium chloride, potassium chloride, and other solid impurities by the filter plate. During the separation process, the filter plate is gradually covered with filtered solids, which slows down the solid-liquid separation process. Therefore, workers are required to regularly clean the solids from the filter plate. Existing tanks have a discharge port located on the side of the tank, near the top of the filter plate. During solids removal, workers remove the solids from the filter plate through the discharge port. However, manual filter plate cleaning is inefficient and significantly increases worker workload.

[0003] To this end, we design a device here for recovering lithium from lithium exchange waste liquid. Utility Model Content

[0004] The purpose of the utility model is to provide a device for recovering lithium from lithium exchange waste liquid in order to solve the problems raised in the background technology in view of the shortcomings of the prior art.

[0005] To achieve the above-mentioned object, the utility model provides the following technical solution: a device for recovering lithium from lithium exchange waste liquid, comprising an ethanol dissolution tank, the ethanol dissolution tank comprising a tank body, a filter plate installed inside the tank body, the filter plate being located near the bottom of the tank body, the filter plate being in the shape of a cone with its tip facing upward, a solid discharge port being opened on the side of the tank body, the lower edge of the solid discharge port being flush with the upper edge of the filter plate, and a gate being installed at the solid discharge port;

[0006] A shell is installed on the top of the tank body, and a stirring shaft is rotatably installed on the top of the inner cavity of the tank body. The top end of the stirring shaft passes through the bottom of the shell, and an axial through hole is opened in the middle of the stirring shaft. A rotating shaft is set in the through hole. The top end of the rotating shaft is rotatably installed on the top of the inner cavity of the shell, and the bottom end of the rotating shaft exceeds the bottom end of the stirring shaft. Push plates are symmetrically installed on both sides of the bottom end of the rotating shaft, and the bottom of the push plate contacts the upper surface of the filter plate.

[0007] A reducer is installed on the top of the shell, and the output shaft of the reducer is arranged inside the shell. Second gears are installed on the output shaft and the rotating shaft of the reducer, and the two second gears are meshed with each other. A second motor is installed on the reducer, and the output shaft of the second motor is connected to the input end of the reducer.

[0008] Preferably, a first motor is further installed on the top of the shell, and the output shaft of the first motor is arranged inside the shell. First gears are installed on the output shaft of the first motor and the stirring shaft, and the two first gears are meshed with each other.

[0009] Preferably, the portion of the stirring shaft located inside the tank body is equipped with a plurality of symmetrically distributed stirring blades.

[0010] Preferably, the device also includes an exchange waste liquid storage tank, a stirring tank, a double-effect evaporation crystallizer, a shell and tube cooler, a pusher centrifuge and a fluidized bed dryer. The discharge port of the exchange waste liquid storage tank is connected to the feed port of the stirring tank through a pump, the discharge port of the stirring tank is connected to the feed port of the double-effect evaporation crystallizer through a pump, the discharge port of the double-effect evaporation crystallizer is connected to the shell-side feed port of the shell and tube cooler through a pump, the shell-side discharge port of the shell and tube cooler is connected to the feed port of the pusher centrifuge, the solid discharge port of the pusher centrifuge is connected to the feed port of the fluidized bed dryer through a conveyor, and the discharge port of the fluidized bed dryer is connected to the solid feed port at the top of the tank body.

[0011] Preferably, the device also includes a vacuum distiller, the liquid outlet at the bottom of the tank body is connected to the feed port of the vacuum distiller through a pump, a tee is installed at the liquid feed port at the top of the tank body, and the distillate outlet of the vacuum distiller is connected to the branch pipe port of the tee through a pump.

[0012] Compared with the prior art, the present invention provides a device for recovering lithium from lithium exchange waste liquid, which has the following beneficial effects:

[0013] The device for recovering lithium from lithium exchange waste liquid is provided with a second motor to drive a rotating shaft to rotate, so that the rotating shaft drives a push plate to rotate. Then, the rotating push plate cooperates with the conical filter plate to push solid matter on the filter plate to a solid discharge port of a tank body, so that the filtered matter is automatically discharged from the tank body, reducing the labor intensity of workers and improving the cleaning efficiency of the filter plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the ethanol dissolving tank of the utility model.

[0016] Figure numerals: 1. Exchange waste liquid storage tank; 2. Stirring tank; 3. Double-effect evaporation crystallizer; 4. Shell and tube cooler; 5. Pusher centrifuge; 6. Fluidized bed dryer; 7. Ethanol dissolution tank; 71. Tank body; 72. Filter plate; 73. Shell; 74. Stirring shaft; 75. Stirring blade; 76. Rotating shaft; 77. Push plate; 78. First motor; 79. First gear; 710. Reducer; 711. Second motor; 712. Second gear; 8. Vacuum distiller. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 2 In this embodiment: a device for recovering lithium from lithium exchange waste liquid comprises an ethanol dissolution tank 7, wherein the ethanol dissolution tank 1 comprises a tank body 71, a filter plate 72 is installed inside the tank body 71, and the filter plate 72 is located near the bottom of the tank body 71. The function of the filter plate 72 is to filter out solids such as sodium chloride, potassium chloride and exchange impurities that are not dissolved by ethanol. The shape of the filter plate 72 is a cone with an upward tip. A solid discharge port is provided on the side of the tank body 71. The lower edge of the solid discharge port is flush with the upper edge of the filter plate 72. A gate is installed at the solid discharge port, and the solid discharge port is used to discharge the filtered solids.

[0019] The top of the tank body 1 is provided with a shell 73, and the top of the inner cavity of the tank body 1 is rotatably provided with a stirring shaft 74. The part of the stirring shaft 74 located in the tank body 1 is provided with a number of symmetrically distributed stirring blades 75. The top of the stirring shaft 74 passes through the bottom of the shell body 73. An axial through hole is opened in the middle of the stirring shaft 74, and a rotating shaft 76 is provided in the through hole. The top of the rotating shaft 76 is rotatably installed on the top of the inner cavity of the shell body 73, and the bottom end of the rotating shaft 76 exceeds the bottom end of the stirring shaft 74. Push plates 77 are symmetrically installed on both sides of the bottom end of the rotating shaft 76. The bottom of the push plate 77 contacts the top of the filter plate 72. When the rotating shaft 76 rotates, it can drive the push plate 77 to rotate. The rotating push plate 77 cooperates with the conical filter plate 72 to push the solid matter on the filter plate 72 to the solid discharge port of the tank body 71, thereby automatically discharging the solid matter on the filter plate 72 from the tank body 71;

[0020] A reducer 710 is installed on the top of the housing 73. The output shaft of the reducer 710 is arranged inside the housing 73. A second gear 712 is installed on the output shaft of the reducer 710 and the rotating shaft 76, and the two second gears 712 are meshed with each other. A second motor 711 is installed on the reducer 710. The output shaft of the second motor 711 is connected to the input end of the reducer 710. The second motor 711 can drive the output shaft of the reducer 710 to rotate, and then the rotating shaft 76 can be driven to rotate through the transmission of the second gear 712. The top of the housing 73 The housing 73 further comprises a first motor 78, the output shaft of which is arranged inside the housing 73. A first gear 79 is mounted on the output shaft of the first motor 78 and the stirring shaft 74, and the two first gears 79 are meshed with each other. The first motor 78 drives the stirring shaft 74 to rotate through the transmission of the first gear 79, so that the stirring shaft 74 drives the stirring blade 75 to rotate, thereby accelerating the dissolution of lithium chloride by ethanol. Valves are mounted on the solid feed port, liquid feed port and liquid discharge port of the tank body 71. During the process of dissolving lithium chloride by ethanol, the tank body 71 is in a sealed state.

[0021] The device also includes an exchange waste liquid storage tank 1, a stirring tank 2, a double-effect evaporation crystallizer 3, a shell and tube cooler 4, a pusher centrifuge 5 and a fluidized bed dryer 6. The discharge port of the exchange waste liquid storage tank 1 is connected to the feed port of the stirring tank 2 through a pump, the discharge port of the stirring tank 2 is connected to the feed port of the double-effect evaporation crystallizer 3 through a pump, the discharge port of the double-effect evaporation crystallizer 3 is connected to the shell-side feed port of the shell and tube cooler 4 through a pump, the shell-side discharge port of the shell and tube cooler 4 is connected to the feed port of the pusher centrifuge 5, the solid discharge port of the pusher centrifuge 5 is connected to the feed port of the fluidized bed dryer 6 through a conveyor, and the discharge port of the fluidized bed dryer 6 is connected to the solid feed port at the top of the tank body 71.

[0022] The device also includes a vacuum distiller 8. The liquid discharge port at the bottom of the tank body 71 is connected to the feed port of the vacuum distiller 8 through a pump. A tee is installed at the liquid feed port at the top of the tank body 71. The main port of the tee is connected to the liquid storage tank for storing ethanol through a pump. The distillate discharge port of the vacuum distiller 8 is connected to the branch port of the tee through a pump. The ethanol obtained by distillation can be pumped back to the tank body 71 for recycling.

[0023] The working principle and use process of the utility model are as follows: when the device for recovering lithium in lithium exchange waste liquid is used, the exchange waste liquid in the exchange waste liquid storage tank 1 is pumped into the stirring tank 2, the configured lithium hydroxide solution and lithium chloride solid are added to the stirring tank 2, the pH value of the waste liquid and the mass content of lithium chloride are adjusted, and then the waste liquid is pumped into the double-effect evaporation crystallizer 3 for evaporation to obtain slurry, and then the slurry is pumped into the shell and tube cooler 4 for cooling, and the cooled slurry enters the pusher centrifuge 5 for solid-liquid separation, and the separated solid matter is sent to the fluidized bed dryer 6 by the conveyor for drying, and the dried solid matter is discharged into the ethanol dissolution tank 7, and an appropriate amount of ethanol is added to the ethanol dissolution tank 7. ethanol, and then turn on the first motor 78 to drive the stirring shaft 74 to rotate, so that the ethanol dissolves the lithium chloride in the solid matter, and then pump the ethanol dissolved with lithium chloride into the vacuum distiller 8, and finally separate the lithium chloride from the ethanol by distillation. During the use of the device, the solid matter on the filter plate 72 is cleaned at regular intervals, the liquid in the tank body 71 is drained, the gate of the solid discharge port of the tank body 71 is opened, and then the second motor 711 is started, and the second motor 711 drives the rotating shaft 76 to rotate, and the rotating shaft 76 drives the push plate 77 to rotate, and the solid matter on the filter plate 72 is discharged from the solid discharge port of the tank body 71 through the cooperation of the rotating push plate 77 and the conical filter plate 72.

[0024] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A device for recovering lithium from lithium exchange waste liquid, comprising an ethanol dissolution tank (7), characterized in that: The ethanol dissolution tank (7) comprises a tank body (71), a filter plate (72) is installed inside the tank body (71), the filter plate (72) is located near the bottom of the tank body (71), the filter plate (72) is in the shape of a cone with the tip facing upward, a solid discharge port is opened on the side of the tank body (71), the lower edge of the solid discharge port is flush with the upper edge of the filter plate (72), and a gate is installed at the solid discharge port; A shell (73) is installed on the top of the tank body (71), and a stirring shaft (74) is rotatably installed on the top of the inner cavity of the tank body (71). The top end of the stirring shaft (74) passes through the bottom of the shell body (73). An axial through hole is opened in the middle of the stirring shaft (74), and a rotating shaft (76) is provided in the through hole. The top end of the rotating shaft (76) is rotatably installed on the top of the inner cavity of the shell body (73). The bottom end of the rotating shaft (76) exceeds the bottom end of the stirring shaft (74). Push plates (77) are symmetrically installed on both sides of the bottom end of the rotating shaft (76), and the bottom of the push plate (77) contacts the upper surface of the filter plate (72); A reducer (710) is installed on the top of the housing (73), and the output shaft of the reducer (710) is arranged inside the housing (73). Second gears (712) are installed on the output shaft of the reducer (710) and the rotating shaft (76), and the two second gears (712) are meshed with each other. A second motor (711) is installed on the reducer (710), and the output shaft of the second motor (711) is connected to the input end of the reducer (710).

2. The device for recovering lithium from lithium exchange waste liquid according to claim 1, wherein: A first motor (78) is also installed on the top of the housing (73). The output shaft of the first motor (78) is arranged inside the housing (73). A first gear (79) is installed on the output shaft of the first motor (78) and the stirring shaft (74), and the two first gears (79) are meshed with each other.

3. The device for recovering lithium from lithium exchange waste liquid according to claim 1, wherein: A plurality of symmetrically distributed stirring blades (75) are installed on the stirring shaft (74) and on the portion located inside the tank body (71).

4. The device for recovering lithium from lithium exchange waste liquid according to claim 1, wherein: The device further comprises an exchange waste liquid storage tank (1), a stirring tank (2), a double-effect evaporation crystallizer (3), a shell-and-tube cooler (4), a pusher centrifuge (5) and a fluidized bed dryer (6); the discharge port of the exchange waste liquid storage tank (1) is connected to the feed port of the stirring tank (2) via a pump; the discharge port of the stirring tank (2) is connected to the feed port of the double-effect evaporation crystallizer (3) via a pump; the discharge port of the double-effect evaporation crystallizer (3) is connected to the shell-side feed port of the shell-and-tube cooler (4) via a pump; the shell-side discharge port of the shell-and-tube cooler (4) is connected to the feed port of the pusher centrifuge (5); the solid discharge port of the pusher centrifuge (5) is connected to the feed port of the fluidized bed dryer (6) via a conveyor; and the discharge port of the fluidized bed dryer (6) is connected to the solid feed port at the top of the tank body (71).

5. The device for recovering lithium from lithium exchange waste liquid according to claim 1, wherein: The device also includes a vacuum distiller (8), the liquid discharge port at the bottom of the tank body (71) is connected to the feed port of the vacuum distiller (8) through a pump, and a tee is installed at the liquid feed port at the top of the tank body (71), and the distillate discharge port of the vacuum distiller (8) is connected to the branch pipe port of the tee through a pump.

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