Lithium hydroxide unqualified product treatment device

Abstract

The utility model discloses a lithium hydroxide unqualified product treatment device which comprises a lithium hydroxide qualified product feeding system (1), a gas conveying system (2), a lithium hydroxide unqualified product feeding device (3) and a single-screw mixing device (4) which are matched with one another. The device has the advantages that the treatment process is simple and convenient, the treatment period is shortened, the production cost and the production energy consumption are reduced, the product quality is ensured, and the whole treatment is more environment-friendly, efficient and energy-saving.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium hydroxide production technology, and particularly relates to a device for treating unqualified lithium hydroxide products. Background Art

[0002] Lithium hydroxide is a white monoclinic fine crystal or powdery solid, which is divided into two forms: anhydrous and monohydrate. It belongs to the monoclinic or tetragonal crystal system and has strong alkalinity and corrosiveness. Lithium hydroxide is widely used in industries such as new energy vehicles, petroleum, chemical industry, light industry, nuclear industry, metallurgy, glass, and ceramics. It is an important lithium chemical raw material and is commonly used for preparing lithium salts, lithium soaps, cathode materials for lithium-ion batteries, lithium-based lubricating greases, and is also used in the electrolyte of alkaline storage batteries, the absorption liquid of lithium bromide refrigerators, analytical reagents, photographic developers, etc.

[0003] In the current production process of lithium hydroxide, unqualified lithium hydroxide products will be redissolved, filtered, heated and evaporated to crystallize by MVR, and then through processes such as centrifugation, drying, and screening. Finally, the unqualified products are converted into qualified products. However, this process has a long process flow, not only consuming a large amount of energy, but also having high manufacturing costs and long processing cycles, and it is impossible to guarantee the quality of the processed products. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problems of long processing cycle, high cost, serious energy consumption, time-consuming and laborious of the existing treatment of unqualified lithium hydroxide products, and provides a device for treating unqualified lithium hydroxide products. The treatment process is simple and convenient, shortening the treatment cycle, reducing production costs and production energy consumption, ensuring product quality, and making the whole treatment more green, efficient and energy-saving.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A device for treating unqualified lithium hydroxide products includes a lithium hydroxide qualified product feeding system, a gas conveying system, a lithium hydroxide unqualified product feeding device and a single-screw mixing device that cooperate with each other.

[0007] The lithium hydroxide qualified product feeding system includes a dryer feed bin, a feed tank, a vacuum belt dryer, a first discharge tank, a second discharge tank and a vibrating screen connected in sequence;

[0008] The gas conveying system includes a gas storage tank, a decarbonizer, a dense-phase pump and a conveying pipe connected in sequence. The conveying pipe is then connected to a lithium hydroxide qualified product discharging valve and a dust collector on the top of the bin. A level gauge is connected below the lithium hydroxide qualified product discharging valve, and the tail of the conveying pipe is connected to a terminal box;

[0009] The unqualified lithium hydroxide feeding device includes an unqualified lithium hydroxide feed bin, the bottom of which is connected with a first blanking pipe. A lithium hydroxide unqualified product blanking valve is arranged on the first blanking pipe, and the end of the first blanking pipe is connected with a conveying pipe;

[0010] The single-screw mixing device includes mixing blades and mixing spiral ribbons arranged in a mixing bin. The top of the mixing blades is connected with the output end of a mixing motor. A control electric box is also arranged on the outer wall of the mixing bin. The end of the conveying pipe is connected with the mixing bin, and the bottom of the mixing bin is provided with a second blanking pipe, and the second blanking pipe is connected with a magnetic separator buffer bin.

[0011] Further, a third blanking pipe is arranged at the bottom of the dryer feed bin, the end of the third blanking pipe is connected with the top of the feed tank, and a blanking valve is connected to the third blanking pipe.

[0012] Further, a star valve is arranged between the second discharge tank and the vibrating screen.

[0013] Further, a first flow meter is connected to the conveying pipe, and the first flow meter is arranged between the connection point of the dense-phase pump and the end of the first blanking pipe, and the connection point of the end of the first blanking pipe is arranged between the first flow meter and the lithium hydroxide qualified product blanking valve.

[0014] Further, a second flow meter is connected to the first blanking pipe, and the second flow meter is arranged between the bottom of the unqualified lithium hydroxide feed bin and the lithium hydroxide unqualified product blanking valve.

[0015] Further, a lithium hydroxide mixture blanking valve is connected to the second blanking pipe.

[0016] Further, the drying vacuum degree of the vacuum belt dryer is 5-10 KPa, the material temperature is 60-80 °C, and the drying time is 30-60 min.

[0017] Further, when the single-screw mixing device is in use, the internal vacuum is pumped to 5-10 Kpa by a vacuum system.

[0018] Compared with the prior art, the advantages of the technical solution of the present utility model are specifically as follows:

[0019] (1) The gas conveying system of the lithium hydroxide material of the present utility model adopts a completely closed method, and uses compressed air after drying and decarbonization as the conveying medium to send the product from one process to another process, avoiding the reaction of the lithium hydroxide material with carbon dioxide and moisture contained in the air, and ensuring the quality of the product;

[0020] (2) When the single - screw mixing device of the present utility model is in use, the vacuum pumping system evacuates the inside, and then the gas protection system fills the mixing device with compressed air after drying and carbon removal to normal pressure, avoiding the reaction of lithium hydroxide material with carbon dioxide and moisture in the air, and further ensuring the product quality;

[0021] (3) According to the impurity content of qualified products and unqualified products, the present utility model adds the two into the mixing device in a certain proportion. The powder flowmeter respectively detects the flow rates of qualified and unqualified lithium hydroxide products. The DCS system respectively regulates the flow rates of qualified and unqualified lithium hydroxide products through the star - shaped valve and the unqualified lithium hydroxide product feeding valve to ensure the mixing ratio of the two;

[0022] (4) The single - screw mixing device of the present utility model is provided with stirring structures such as single - screw stirring blades and stirring spiral ribbons. By optimizing equipment parameters such as the rotation speed, mixing time, and filling coefficient of the single - screw stirring blades and stirring spiral ribbons, the lithium hydroxide particles can be effectively mixed evenly;

[0023] (5) The unqualified product treatment system of the present utility model does not need to go through processes such as re - dissolution and MVR evaporation crystallization. It only needs to be stirred and mixed with qualified products. The treatment process has a simple flow, reduces a large amount of production energy consumption and production costs, and greatly shortens the treatment cycle. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the lithium hydroxide unqualified product treatment device of the present utility model. Detailed Embodiments Embodiment 1

[0025] To make the present utility model more clearly understood, the following further describes a lithium hydroxide unqualified product treatment device of the present utility model with reference to the drawings. The specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] In this embodiment, the SO 4 2- content of the unqualified lithium hydroxide product is 0.020%, the LiOH·H 2 O - D1 standard requirement is ≤0.008%, the SO 4 2- content of the qualified lithium hydroxide product is 0.003%. Considering that the impurity content of the same batch of materials also fluctuates, it is recommended to calculate according to the SO 4 2- content of the mixed lithium hydroxide ≤0.006%, that is, the mixing mass ratio of unqualified products to qualified products is not less than 1:5.

[0027] See Figure 1, a lithium hydroxide defective product processing device, characterized in that:

[0028] The invention comprises a lithium hydroxide qualified product feeding system 1, a gas conveying system 2, a lithium hydroxide unqualified product feeding device 3 and a single screw mixing device 4 which cooperate with each other.

[0029] The qualified lithium hydroxide feeding system 1 comprises a dryer feed bin 11, a feed tank 12, a vacuum belt dryer 13, a first discharge tank 14, a second discharge tank 15 and a vibrating screen 16 which are connected in sequence. A third discharge pipe 17 is provided at the bottom of the dryer feed bin 11, the end of the third discharge pipe 17 is connected to the top of the feed tank 12, and a discharge valve 18 is connected to the third discharge pipe 17. A star valve 19 is provided between the second discharge tank 15 and the vibrating screen 16.

[0030] The gas delivery system 2 includes a gas storage tank 21, a decarbonizer 22, a dense phase pump 23 and a delivery pipe 24 which are connected in sequence. The delivery pipe 24 is further connected to a lithium hydroxide qualified product discharge valve 25 and a silo top dust collector 26. A material level meter 27 is connected below the lithium hydroxide qualified product discharge valve 25. The tail of the delivery pipe 24 is further connected to a terminal box 28.

[0031] The delivery pipe 24 is connected with a first flow meter 29 , which is arranged between the dense phase pump 23 and the terminal connection point of the first discharge pipe 32 , and the terminal connection point of the first discharge pipe 32 is arranged between the first flow meter 29 and the qualified lithium hydroxide discharge valve 25 .

[0032] The unqualified lithium hydroxide product feeding device 3 includes an unqualified lithium hydroxide product feeding bin 31, the bottom of which is connected to a first discharge pipe 32, the first discharge pipe 32 is provided with an unqualified lithium hydroxide product discharge valve 33, and the end of the first discharge pipe 32 is connected to the conveying pipe 24, the first discharge pipe 32 is connected to a second flow meter 34, and the second flow meter 34 is arranged between the bottom of the unqualified lithium hydroxide product feeding bin 31 and the unqualified lithium hydroxide product discharge valve 33.

[0033] The single-screw mixing device 4 includes a stirring blade 42 and a stirring spiral belt 43 arranged in a stirring bin 41. The top of the stirring blade 42 is connected to the output end of a stirring motor 44. A control electrical box 45 is also provided on the outer wall of the stirring bin 41. The end of the conveying pipe 24 is connected to the stirring bin 41. A second discharge pipe 46 is provided at the bottom of the stirring bin 41. The second discharge pipe 46 is connected to a lithium hydroxide mixture discharge valve 47 and is connected to the iron remover buffer bin.

[0034] In this embodiment, the vacuum belt dryer 13 is usually connected to a crusher, a discharge tank, a vacuum feeder and a dry powder tank. The drying vacuum degree is generally 5 to 10 KPa, the material temperature is 60 to 80° C., and the drying time is 30 to 60 minutes.

[0035] In this embodiment, the first flow meter 29 and the second flow meter 34 are powder flow meters, which respectively detect the flow of qualified and unqualified lithium hydroxide. The DCS system controls the amount of lithium hydroxide discharged into the vibrating screen 16 and the air flow conveying device through the star valve 19, and then controls the flow of qualified lithium hydroxide in the gas conveying device 2. In addition, the DCS system regulates the flow of unqualified lithium hydroxide through the unqualified lithium hydroxide discharge valve 25 to ensure the ratio of the two entering the mixing device.

[0036] In this embodiment, when the single-screw mixing device 4 is used, the vacuum system will evacuate the inside to 5-10KPa, and then the gas protection system will introduce dry and decarbonized compressed air into the mixing device to normal pressure, thereby preventing the lithium hydroxide material from reacting with the carbon dioxide and moisture contained in the air.

[0037] In this embodiment, the single-screw mixing device 4 optimizes the equipment parameters such as the rotation speed of the stirring blade 42, the rotation speed of the stirring ribbon 43, the filling factor, the mixing time, and detects the mixing degree to ensure a good mixing effect. Example 2

[0038] In this embodiment, the CO of unqualified lithium hydroxide 3 2- Content 0.58%, LiOH·H 2 O-D1 standard requirement ≤ 0.4%; Cl - Content 0.006%, LiOH·H 2 O-D1 standard requires ≤0.002%. CO of qualified lithium hydroxide 3 2- Content 0.25%, Cl - The content is 0.0012%. Considering that the impurity content of the same batch of materials also fluctuates, it is recommended to follow the mixed lithium hydroxide CO 3 2- Content ≤0.35%, Cl - The content is ≤0.0018% for calculation, that is, the mass ratio of unqualified products to qualified products is not less than 1:7, according to Cl - Content, CO 3 2- The proportion of content calculation takes the minimum value.

[0039] See also Figure 1 The unqualified lithium hydroxide product processing device of this embodiment also includes a lithium hydroxide qualified product feeding system 1, a gas delivery system 2, a lithium hydroxide unqualified product feeding device 3 and a single screw mixing device 4 that cooperate with each other, and the specific connection relationship is the same as that of Example 1.

[0040] The utility model converts unqualified lithium hydroxide products with excessive impurity content into qualified products by stirring and mixing them with qualified lithium hydroxide products, thereby avoiding the need for unqualified products to enter processes such as re-dissolution and MVR evaporation crystallization, thus achieving energy conservation, emission reduction, cost reduction and efficiency improvement.

[0041] In addition to the above embodiments, the utility model may have other implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the utility model.

Claims

1. A device for processing unqualified lithium hydroxide, characterized in that: It comprises a lithium hydroxide qualified product feeding system (1), a gas delivery system (2), a lithium hydroxide unqualified product feeding device (3) and a single screw mixing device (4) which cooperate with each other; The qualified lithium hydroxide feeding system (1) comprises a dryer feeding bin (11), a feeding tank (12), a vacuum belt dryer (13), a first discharge tank (14), a second discharge tank (15) and a vibrating screen (16) which are connected in sequence; The gas delivery system (2) comprises a gas storage tank (21), a decarbonizer (22), a dense phase pump (23) and a delivery pipe (24) which are connected in sequence. The delivery pipe (24) is further connected to a lithium hydroxide qualified product discharge valve (25) and a silo top dust collector (26). A material level meter (27) is connected below the lithium hydroxide qualified product discharge valve (25). The tail end of the delivery pipe (24) is further connected to a terminal box (28). The unqualified lithium hydroxide product feeding device (3) comprises an unqualified lithium hydroxide product feeding bin (31), the bottom of which is connected to a first discharge pipe (32), the first discharge pipe (32) is provided with an unqualified lithium hydroxide product discharge valve (33), and the end of the first discharge pipe (32) is connected to a conveying pipe (24); The single-screw mixing device (4) comprises a stirring blade (42) and a stirring spiral belt (43) arranged in a stirring chamber (41); the top of the stirring blade (42) is connected to the output end of the stirring motor (44); a control electric box (45) is also provided on the outer wall of the stirring chamber (41); the end of the conveying pipe (24) is connected to the stirring chamber (41); a second discharge pipe (46) is provided at the bottom of the stirring chamber (41); and the second discharge pipe (46) is connected to the iron remover buffer chamber.

2. The unqualified lithium hydroxide product processing device according to claim 1, characterized in that: A third discharge pipe (17) is provided at the bottom of the dryer feed bin (11), the end of the third discharge pipe (17) is connected to the top of the feed tank (12), and a discharge valve (18) is connected to the third discharge pipe (17).

3. The unqualified lithium hydroxide product processing device according to claim 1 or 2, characterized in that: A star valve (19) is provided between the second discharge tank (15) and the vibrating screen (16).

4. The unqualified lithium hydroxide product processing device according to claim 3 is characterized in that: The delivery pipe (24) is connected to a first flow meter (29), the first flow meter (29) is arranged between the dense phase pump (23) and the terminal connection point of the first discharge pipe (32), and the terminal connection point of the first discharge pipe (32) is arranged between the first flow meter (29) and the qualified lithium hydroxide discharge valve (25).

5. The unqualified lithium hydroxide product processing device according to claim 4 is characterized in that: The first discharge pipe (32) is connected to a second flow meter (34), and the second flow meter (34) is arranged between the bottom of the lithium hydroxide defective product feed (31) bin and the lithium hydroxide defective product discharge valve (33).

6. The unqualified lithium hydroxide product processing device according to claim 1 or 2, characterized in that: The second discharge pipe (46) is connected to a lithium hydroxide mixed material discharge valve (47).

7. The unqualified lithium hydroxide product processing device according to claim 1 or 2, characterized in that: The drying vacuum degree of the vacuum belt dryer (13) is 5 to 10 KPa, the material temperature is 60 to 80°C, and the drying time is 30 to 60 minutes.

8. The unqualified lithium hydroxide product processing device according to claim 1 or 2, characterized in that: When the single-screw mixing device (4) is in use, the vacuum system will draw a vacuum of 5 to 10 KPa inside.

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