Lithium fluoride and anhydrous hydrogen fluoride mixing device

Abstract

The utility model relates to a lithium fluoride and anhydrous hydrogen fluoride mixing device. The lithium fluoride and anhydrous hydrogen fluoride mixing device comprises a mixing unit and a lithium fluoride weighing and feeding unit, the mixing unit comprises a material mixing box, an anhydrous hydrogen fluoride feeding pipe is arranged on the material mixing box, a stirring device is arranged in the material mixing box, the lithium fluoride weighing and feeding unit comprises a fixing frame, a weighing hopper capable of moving up and down is installed on the fixing frame, and the weighing hopper is connected with the stirring device. A weighing sensor is arranged between the fixing frame and the weighing hopper, a feeder for feeding materials into the weighing hopper is arranged on the fixing frame, a cover cap covering a feeding port of the weighing hopper is arranged on a discharging port of the feeder, the lithium fluoride weighing and feeding unit comprises a spiral conveyor, a discharging port of the spiral conveyor is communicated with the mixing box, and the mixing box is communicated with the feeding port of the weighing hopper. And a feed port of the spiral conveyor is connected with a discharge port of the weighing hopper through a corrugated pipe. Compared with the prior art, the anhydrous hydrofluoric acid feeding and lithium fluoride weighing feeding functions are realized, and the safety in the preparation process of the lithium fluoride anhydrous hydrofluoric acid mother liquor is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to lithium fluoride and anhydrous hydrogen fluoride mixing device belongs to lithium hexafluorophosphate production equipment technical field, specifically related to a lithium fluoride and anhydrous hydrogen fluoride mixing device. BACKGROUND

[0002] As the most widely used lithium ion battery electrolyte in commercial applications, lithium hexafluorophosphate has good ionic conductivity and electrochemical stability, and becomes the core raw material for producing lithium ion battery electrolyte. With the rapid development of new energy industry, its market demand increases sharply, and has good development prospect.

[0003] In the industrial production process of lithium hexafluorophosphate, the most stable and commonly used is to adopt wet preparation process, and the specific steps are as follows: lithium fluoride powder is added into anhydrous hydrogen fluoride to form LiF·HF solution of lithium fluoride, then phosphorus pentafluoride is introduced into the solution to produce LiPF6·HF solution of dissolved lithium hexafluorophosphate, and then LiPF6·HF solution is obtained by cooling crystallization, separation and drying to obtain lithium hexafluorophosphate crystal.

[0004] In the production process of lithium fluoride-hydrogen fluoride mother liquor, manual feeding is usually used, and the feeding speed and amount need to be manually controlled, which inevitably causes powder blockage, amount deviation and other problems; long-time manual feeding process is time-consuming and laborious, and also brings risks to workers, and trace dust and acidic gas also cause health problems to operators. UTILITY MODEL CONTENTS

[0005] In order to solve the above technical problems, the utility model provides a lithium fluoride and anhydrous hydrogen fluoride mixing device.

[0006] The technical scheme of the lithium fluoride and anhydrous hydrogen fluoride mixing device of the utility model is:

[0007] A lithium fluoride and anhydrous hydrogen fluoride mixing device, which comprises a mixing unit and a lithium fluoride weighing feeding unit, the mixing unit comprises a mixing box, the mixing box is provided with an anhydrous hydrogen fluoride feeding pipe, the mixing box is provided with a stirring device, the lithium fluoride weighing feeding unit comprises a fixing frame, the fixing frame is guidedly installed with a weighing hopper capable of moving up and down, a weighing sensor is arranged between the fixing frame and the weighing hopper, a feeder for feeding into the weighing hopper is arranged on the fixing frame, a cover is arranged on the discharge port of the feeder, and the cover covers the feeding port of the weighing hopper, the lithium fluoride weighing feeding unit comprises a screw conveyor, the discharge port of the screw conveyor is communicated with the mixing box, and the feeding port of the screw conveyor is connected with the discharge port of the weighing hopper through a corrugated pipe.

[0008] Further, the feeder is a spiral feeder, and a feeding hopper is arranged on the feeding port of the feeder.

[0009] Further, the weighing hopper comprises a small-diameter cylindrical section, an upper taper section, a large-diameter cylindrical section and a lower taper section which are integrally formed from top to bottom, and the cover is in sliding fit with the small-diameter cylindrical section.

[0010] Further, the fixing frame is provided with a mounting hole matched with the large-diameter cylindrical section, the outer wall of the large-diameter cylindrical section at the upper side of the mounting hole is provided with a plurality of angle codes which are uniformly and circumferentially arranged, the lower end of each angle code is provided with a pressing plate for pressing the weighing sensor, the lower side of the lower taper section is provided with a discharge valve, and the discharge port of the discharge valve is connected with the corrugated pipe.

[0011] Further, the stirring device comprises a stirring shaft and a driving motor, the driving motor is fixedly connected to the upper side of the mixing box through a motor fixing seat, the stirring shaft comprises a central shaft, a plurality of horizontally extending connecting rods are fixedly connected to the upper end of the central shaft, stirring rods are fixedly connected to the end portions of the connecting rods at the lower side, a turning auger is arranged at the lower side of the central shaft, a sleeve is arranged at the outer side of the turning auger, and the sleeve is fixedly connected to the inner wall of the mixing box through a fixing rod.

[0012] Further, the lower end of the mixing box is provided with a discharge pipe, the lower end of the discharge pipe is provided with a discharge valve, the lower end of the central shaft extends into the discharge pipe, a discharge auger is arranged on the central shaft in the discharge pipe, and the rotation direction of the discharge auger is the same as that of the turning auger.

[0013] Further, the anhydrous hydrogen fluoride feeding pipe is provided with a flow meter.

[0014] The utility model provides a kind of lithium fluoride and anhydrous hydrogen fluoride mixing device, compared with prior art, its beneficial effects are:

[0015] The utility model discloses lithium fluoride and anhydrous hydrogen fluoride mixing device uses, anhydrous hydrogen fluoride enters mixing box by anhydrous hydrogen fluoride feeding pipe, flow meter controls anhydrous hydrogen fluoride liquid intake amount.Lithium fluoride weighing feeding unit is weighed to lithium fluoride, and the lithium fluoride that is weighed is input to mixing box.Anhydrous hydrogen fluoride and lithium fluoride in mixing box are stirred and mixed by stirring device, and the lithium fluoride anhydrous hydrogen fluoride acid mother liquor after stirring and mixing is discharged to next process by discharge pipe.Compared with prior art, the lithium fluoride and anhydrous hydrogen fluoride mixing device of the utility model realizes anhydrous hydrogen fluoride feeding and lithium fluoride weighing feeding function, and improves the safety in lithium fluoride anhydrous hydrogen fluoride acid mother liquor configuration process. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the structure schematic diagram of lithium fluoride and anhydrous hydrogen fluoride mixing device of the utility model;

[0017] Fig. 2This is a schematic diagram of the mixing unit in the lithium fluoride and anhydrous hydrogen fluoride mixing device of this utility model;

[0018] Fig. 3 This is a schematic diagram of the lithium fluoride weighing and feeding unit in the lithium fluoride and anhydrous hydrogen fluoride mixing device of this utility model.

[0019] In the diagram: 1. Mixing box; 2. Motor mounting base; 3. Drive motor; 4. Central shaft; 5. Connecting rod; 6. Stirring rod; 7. Tilting auger; 8. Sleeve; 9. Fixing rod; 10. Discharge pipe; 11. Discharge auger; 12. Discharge valve; 13. Anhydrous hydrogen fluoride feed pipe; 14. Flow meter; 15. Fixing frame; 16. Feeder; 17. Feed hopper; 18. Cover; 19. Angle bracket; 20. Pressure plate; 21. Weighing sensor; 22. Weighing hopper; 23. Discharge valve; 24. Bellows; 25. Screw conveyor. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0021] Specific embodiments of the lithium fluoride and anhydrous hydrogen fluoride mixing device of this utility model are as follows: Figs. 1 to 3 As shown, the system includes a mixing unit and a lithium fluoride weighing and feeding unit. The mixing unit includes a mixing tank 1, which is equipped with an anhydrous hydrogen fluoride feed pipe 13 and a stirring device. The lithium fluoride weighing and feeding unit includes a fixed frame 15, on which a weighing hopper 22 capable of vertical movement is guided and installed. A weighing sensor 21 is provided between the fixed frame 15 and the weighing hopper 22. The fixed frame 15 is equipped with a feeder 16 for feeding material into the weighing hopper 22. The outlet of the feeder 16 is equipped with a cover 18 that covers the inlet of the weighing hopper 22. The lithium fluoride weighing and feeding unit includes a screw conveyor 25, whose outlet is connected to the mixing tank 1. The inlet of the screw conveyor 25 is connected to the outlet of the weighing hopper 22 through a corrugated pipe 24.

[0022] The feeder 16 is a screw feeder 16, and a feed hopper 17 is provided on the feed inlet of the feeder 16. The weighing hopper 22 includes a small-diameter cylindrical section, an upper conical section that is smaller at the top and larger at the bottom, a large-diameter cylindrical section, and a lower conical section that is larger at the top and smaller at the bottom, all integrally formed from top to bottom. The cover 18 is slidably fitted with the small-diameter cylindrical section. The fixing frame 15 is provided with mounting holes that match the large-diameter cylindrical section. Several corner brackets 19 are evenly spaced along the circumference on the outer wall of the large-diameter cylindrical section located above the mounting holes. The lower end of the corner brackets 19 is provided with a pressure plate 20 for pressing the weighing sensor 21. A discharge valve is provided on the lower side of the lower conical section, and the discharge port of the discharge valve is connected to the bellows 24.

[0023] The stirring device comprises a stirring shaft and a driving motor 3 fixedly connected to the upper side of the mixing box 1 through a motor fixing base 2, the stirring shaft comprises a central shaft 4, the upper end of the central shaft 4 is fixedly connected with a plurality of horizontally extending connecting rods 5, the end portions of the connecting rods 5 are fixedly connected with stirring rods 6 at the lower side, the lower side of the central shaft 4 is provided with a material turning auger 7, the outer side of the material turning auger 7 is provided with a sleeve 8, the sleeve 8 is fixedly connected with the inner wall of the mixing box 1 through a fixing rod 9. The lower end of the mixing box 1 is provided with a discharge pipe 10, the lower end of the discharge pipe 10 is provided with a discharge valve 12, the lower end of the central shaft 4 extends into the discharge pipe 10, the central shaft 4 in the discharge pipe 10 is provided with a discharge auger 11, the rotation direction of the discharge auger 11 is the same as that of the material turning auger 7. The anhydrous hydrogen fluoride feeding pipe 13 is provided with a flow meter 14.

[0024] The working principle of the lithium fluoride and anhydrous hydrogen fluoride mixing device is as follows: the anhydrous hydrogen fluoride is added into the mixing box 1 through the anhydrous hydrogen fluoride feeding pipe 13, the flow meter 14 controls the liquid feeding amount, and the liquid feeding is stopped when the set amount is reached. The feeder 16 feeds lithium fluoride into the weighing hopper 22, the weighing hopper 22 and the weighing sensor 21 weigh the lithium fluoride, and the feeder 16 is closed when the amount of lithium fluoride reaches the set value. The discharge valve 23 and the screw conveyor 25 are opened, and the lithium fluoride in the weighing hopper 22 is conveyed into the mixing box 1. The driving motor 3 is started, the driving motor 3 drives the stirring rod 6 and the material turning auger 7 to rotate, the stirring rod 6 mixes the lithium fluoride and the anhydrous hydrogen fluoride in the mixing box 1, the material turning auger 7 and the sleeve 8 turn up the lithium fluoride and the anhydrous hydrogen fluoride at the bottom of the mixing box 1, and the discharge auger 11 turns up the lithium fluoride and the anhydrous hydrogen fluoride in the discharge pipe 10 into the mixing box 1. After the lithium fluoride and the anhydrous hydrogen fluoride are completely mixed, the driving motor 3 is reversely rotated, and the discharge valve 12 is started to discharge the lithium fluoride and the anhydrous hydrogen fluoride mother liquor in the mixing box 1.

[0025] In the lithium fluoride and anhydrous hydrogen fluoride mixing device, the anhydrous hydrogen fluoride enters the mixing box 1 through the anhydrous hydrogen fluoride feeding pipe 13, and the flow meter 14 controls the anhydrous hydrogen fluoride liquid feeding amount. The lithium fluoride weighing feeding unit weighs the lithium fluoride and inputs the weighed lithium fluoride into the mixing box 1. The stirring device stirs and mixes the anhydrous hydrogen fluoride and the lithium fluoride in the mixing box 1, and the stirred and mixed lithium fluoride anhydrous hydrogen fluoride mother liquor flows out of the discharge pipe 10 to the next process. Compared with the prior art, the lithium fluoride and anhydrous hydrogen fluoride mixing device realizes the functions of anhydrous hydrogen fluoride feeding and lithium fluoride weighing feeding, and improves the safety in the lithium fluoride anhydrous hydrogen fluoride mother liquor configuration process.

[0026] The above is only a preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A lithium fluoride and anhydrous hydrogen fluoride mixing device, characterized by, The application relates to a lithium fluoride mixing device, which comprises a mixing unit and a lithium fluoride weighing feeding unit, wherein the mixing unit comprises a mixing box, a water-free hydrogen fluoride feeding pipe is arranged on the mixing box, a stirring device is arranged in the mixing box, the lithium fluoride weighing feeding unit comprises a fixing frame, a weighing hopper capable of moving up and down is guided and arranged on the fixing frame, a weighing sensor is arranged between the fixing frame and the weighing hopper, a feeder for feeding into the weighing hopper is arranged on the fixing frame, a cover is arranged on the discharge port of the feeder and covers the feeding port of the weighing hopper, the lithium fluoride weighing feeding unit comprises a screw conveyor, the discharge port of the screw conveyor is communicated with the mixing box, and the feeding port of the screw conveyor is connected with the discharge port of the weighing hopper through a bellows.

2. The lithium fluoride and anhydrous hydrogen fluoride mixing apparatus of claim 1, wherein, The feeder is a screw feeder, and a feeding hopper is arranged on the feeding port of the feeder.

3. The lithium fluoride and anhydrous hydrogen fluoride mixing apparatus of claim 2, wherein, The weighing hopper comprises a small-diameter cylindrical section, an upper small-diameter and lower large-diameter upper conical section, a large-diameter cylindrical section and a lower large-diameter and small-diameter lower conical section which are integrally formed from top to bottom, and the cover is in sliding fit with the small-diameter cylindrical section.

4. The lithium fluoride and anhydrous hydrogen fluoride mixing apparatus of claim 3, wherein A mounting hole matched with the large-diameter cylindrical section is arranged on the fixing frame, a plurality of angle codes are arranged on the outer wall of the large-diameter cylindrical section at the upper side of the mounting hole and are uniformly and circumferentially spaced, the lower end of the angle code is provided with a pressing plate for pressing the weighing sensor, a discharge valve is arranged on the lower side of the lower conical section, and the discharge port of the discharge valve is connected with the bellows.

5. The lithium fluoride and anhydrous hydrogen fluoride mixing device of claim 1, wherein, The stirring device comprises a stirring shaft and a driving motor, the driving motor is fixedly connected with the upper side of the mixing box through a motor fixing seat, the stirring shaft comprises a central shaft, a plurality of horizontally extending connecting rods are fixedly connected with the upper end of the central shaft, stirring rods are fixedly connected with the end portions of the connecting rods at the lower side, a turning auger is arranged on the lower side of the central shaft, a sleeve is arranged on the outer side of the turning auger, and the sleeve is fixedly connected with the inner wall of the mixing box through a fixing rod.

6. The lithium fluoride and anhydrous hydrogen fluoride mixing apparatus of claim 5, wherein, A discharge pipe is arranged at the lower end of the mixing box, a discharge valve is arranged at the lower end of the discharge pipe, the lower end of the central shaft extends into the discharge pipe, a discharge auger is arranged on the central shaft in the discharge pipe, and the rotation direction of the discharge auger is the same as that of the turning auger.

7. The lithium fluoride and anhydrous hydrogen fluoride mixing apparatus of claim 1, wherein A flow meter is arranged on the water-free hydrogen fluoride feeding pipe.

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