Impurity removal reaction kettle for high-salt lithium-containing mother liquor

Abstract

The utility model provides a high-salt lithium-containing mother liquor impurity removal reaction kettle which comprises a kettle body, a reaction kettle body and a reaction kettle cover, the stirring motor is arranged on the cover body; the stirring paddle comprises a main shaft and a paddle shaft, the paddle shaft is vertically arranged and parallel to the inner wall of the kettle body, the upper part of the main shaft is connected with the stirring motor, and the lower part of the main shaft is connected with the lower part of the paddle shaft; the water inlet joint is sleeved on the main shaft; a scraping plate is arranged on the side, facing the inner wall, of the paddle shaft; communicated water flow channels are arranged in the main shaft and the paddle shaft; the water inlet is communicated with the water flow channel; a plurality of first nozzles are arranged on the slurry shaft along the length direction and can spray water to the inner wall of the kettle body; the water inlet connector is connected with the main shaft through a bearing, provided with an annular water inlet cavity corresponding to the water inlet and connected with a water inlet pipe. According to the reaction kettle, the scraper and the first nozzle are arranged on the paddle shaft, so that sediments can be effectively prevented from being deposited on the inner wall, meanwhile, the kettle body can be well cleaned, rapid cleaning is realized, the cleaning frequency and the overhaul and maintenance frequency are reduced, water is saved, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium salt production equipment, and particularly relates to an impurity removal reactor for high-salt lithium-containing mother liquor. Background Art

[0002] In the process of preparing lithium salt from spodumene ore, lithium sulfate finished liquor is obtained through roasting, acidification, pulp leaching, purification, and evaporation concentration. The lithium sulfate finished liquor is used as a raw material for the production of lithium carbonate or lithium hydroxide. For the production of lithium carbonate, a lithium precipitation reaction occurs in the lithium sulfate, obtaining a lithium carbonate product and a lithium precipitation mother liquor. The lithium precipitation mother liquor is neutralized with sulfuric acid and evaporated and crystallized to obtain anhydrous sodium sulfate and a sodium separation mother liquor. There is a high content of lithium in the sodium separation mother liquor, and it needs to be recycled, so it will circulate in the system all the time, thus enriching a large amount of impurities, such as boron, complexing agents (EDTA), etc. These impurities will affect the product quality, reduce the product quality, and cause huge losses to production enterprises. Therefore, it is necessary to perform treatments such as boron removal and complexing agent removal on this sodium separation mother liquor (i.e., high-salt lithium-containing mother liquor).

[0003] When performing treatments such as boron removal and complexing agent removal on the high-salt lithium-containing mother liquor, powders such as iron powder and activated carbon are added. The solution concentration of the reaction system is extremely high, and more precipitates will be generated during the reaction process. When using an existing reactor as a container for the reaction, there are often problems such as serious precipitation accumulation, difficult cleaning, and blockage of the discharge port, resulting in long cleaning time, large water consumption, and high maintenance frequency, which affects the production efficiency. Summary of the Utility Model

[0004] Aiming at the deficiencies of the above-mentioned existing technologies, the utility model provides an impurity removal reactor for high-salt lithium-containing mother liquor. By setting a slurry shaft adapted to the inner wall of the reactor body and arranging a scraper and a first nozzle on the slurry shaft, it can effectively prevent precipitation from depositing on the inner wall of the reactor body, and at the same time can well clean the inner wall of the reactor body, realizing rapid cleaning, reducing the number of cleaning times, saving water, reducing the maintenance frequency, and improving the production efficiency.

[0005] To achieve the above object, the technical solution adopted by the utility model is as follows:

[0006] An impurity removal reactor for high-salt lithium-containing mother liquor, comprising:

[0007] A reactor body with an openable cover;

[0008] A stirring motor arranged on the cover;

[0009] A stirring paddle, including a main shaft and a slurry shaft. The slurry shaft is vertically arranged and parallel to the inner wall of the reactor body. The upper part of the main shaft is in transmission connection with the stirring motor, and the lower part of the main shaft is connected to the lower part of the slurry shaft;

[0010] A water inlet joint sleeved on the main shaft;

[0011] Wherein, a scraper is provided on one side of the pulp shaft facing the inner wall of the kettle body;

[0012] A water flow channel communicating with each other is provided axially inside the main shaft and the pulp shaft; a water inlet is provided radially on the upper part of the main shaft and communicates with the water flow channel; a plurality of first nozzles are provided along the length direction of the pulp shaft, and the first nozzles communicate with the water flow channel and can spray water to the inner side wall of the kettle body; the water inlet joint is rotationally and sealingly connected to the main shaft through a bearing, the water inlet joint has an annular water inlet cavity corresponding to the water inlet, and the water inlet joint is connected to a water inlet pipe.

[0013] In an embodiment of the present application, the scraper is arranged along the length of the pulp shaft and is detachably connected to the pulp shaft.

[0014] In an embodiment of the present application, a clamping groove is provided along the length direction of the pulp shaft, and the scraper is inserted into the clamping groove from top to bottom through a clamping portion; a detachable end cap is provided on the upper part of the pulp shaft, and the end cap limits the scraper in the clamping groove.

[0015] In an embodiment of the present application, the scraper is made of fluororubber or fluorosilicone rubber material.

[0016] In an embodiment of the present application, a discharge port is centrally arranged at the bottom of the kettle body, and at least one second nozzle is provided at the bottom of the main shaft facing the discharge port.

[0017] In an embodiment of the present application, both the first nozzle and the second nozzle are check nozzles.

[0018] In an embodiment of the present application, the first nozzle is arranged perpendicular to the pulp shaft, and its spraying direction deviates from the radial direction of the kettle body and is biased towards the rotation direction of the stirring paddle.

[0019] In an embodiment of the present application, a temperature detector and a pH detector are further included, and the temperature detector and the pH detector are detachably installed on the cover body and extend downward into the rotation gap between the main shaft and the pulp shaft.

[0020] In an embodiment of the present application, a jacket is provided outside the kettle body, the jacket is provided with a heat exchange medium inlet and a heat exchange medium outlet, and first solenoid valves are provided on both the heat exchange medium inlet and the heat exchange medium outlet;

[0021] At least 5 feed ports are provided on the cover body, and second solenoid valves are provided on all the feed ports;

[0022] A third solenoid valve is provided on the water inlet pipe.

[0023] In an embodiment of the present application, it further includes a controller, and the controller is connected to the stirring motor, temperature detector, pH detector, first solenoid valve, second solenoid valve and third solenoid valve.

[0024] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0025] For the impurity removal reactor for high-salt lithium-containing mother liquor of the present utility model, by arranging a slurry shaft adapted to the inner wall of the reactor body and providing a scraper and a first nozzle on the slurry shaft, it can effectively prevent precipitation from depositing on the inner wall of the reactor body. At the same time, it can spray water onto the inner wall of the reactor body, well cleaning the inner wall of the reactor body, reducing the number of cleaning times, achieving rapid cleaning, saving water, reducing the maintenance frequency, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a schematic cross-sectional structure diagram of an impurity removal reactor for high-salt lithium-containing mother liquor.

[0028] Figure 2 It is a schematic structure diagram of a stirring motor, a stirring paddle and a water inlet joint.

[0029] Figure 3 For Figure 2 The cross-sectional structure diagram in the A-A direction in

[0030] REFERENCE MARKS:

[0031] 1. Reactor body; 11. Discharge port;

[0032] 2. Cover body; 21. Temperature detector; 22. pH detector; 23. Feed inlet;

[0033] 3. Stirring motor;

[0034] 4. Stirring paddle; 41. Main shaft; 411. Second nozzle; 42. Slurry shaft; 421. First nozzle; 422. Card slot; 423. End cap; 43. Scraper; 431. Clamping part; 44. Water flow channel;

[0035] 5. Water inlet joint; 51. Annular water inlet cavity; 52. Water inlet pipe;

[0036] 6. Jacket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "vertical", "horizontal", "length", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the products of the present invention are usually placed during use, or the orientation or positional relationships commonly understood by those skilled in the art. These 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 thus should not be construed as a limitation to the present invention.

[0039] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0040] The terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0042] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0043] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0044] The embodiment of the utility model provides a high-salt lithium-containing mother liquor impurity removal reactor, which is suitable for high-concentration reaction systems and reaction systems that will produce more precipitation, and is particularly suitable for the impurity removal (boron removal, complexing agent removal, etc.) of high-salt lithium-containing mother liquor (sodium precipitation mother liquor) in the process of producing battery-grade lithium salts (battery-grade lithium carbonate, battery-grade lithium hydroxide).

[0045] like Figure 1 As shown, the high-salt lithium-containing mother liquor impurity removal reactor comprises: a reactor body 1, a cover body 2, a stirring motor 3, a stirring paddle 4, a water inlet joint 5, etc.

[0046] The kettle body 1 is used to contain the reaction solution and perform the reaction. An openable cover body 2 is provided on the top of the kettle body 1 , and the cover body 2 can be sealed with the kettle body 1 .

[0047] The stirring motor 3 is disposed on the cover 2 , and an output end thereof is downwardly connected to a main shaft 41 in the stirring paddle 4 .

[0048] like Figure 1 and Figure 2 As shown, the stirring paddle 4 includes a main shaft 41 and a paddle shaft 42. The paddle shaft 42 is arranged vertically, with the upper part being vertical and the lower part being bent inwardly, and is parallel to the inner side wall and the bottom wall of the kettle body 1; the main shaft 41 is arranged vertically and coaxially with the kettle body 1, the upper part of the main shaft 41 passes through the cover body 2 and is transmission-connected to the output end of the stirring motor 3, and the lower part of the main shaft 41 is connected to the lower part of the paddle shaft 42. The paddle shaft 42 includes at least two, which are symmetrically or circumferentially arranged around the main shaft 41 and adapted to the inner wall of the kettle body 1.

[0049] The water inlet joint 5 is sleeved on the main shaft 41. Preferably, the water inlet joint 5 is located at the upper part of the cover body 2 and outside the kettle body 1. Of course, the water inlet joint 5 can also be arranged at the lower part of the cover body 2.

[0050] A scraper 43 is provided on the side of the paddle shaft 42 facing the inner wall of the kettle body 1 , and the outer edge of the scraper 43 is close to the inner wall of the kettle body 1 .

[0051] A water flow channel 44 is axially arranged inside the main shaft 41 and the paddle shaft 42, and the water flow channels 44 of the main shaft 41 and the paddle shaft 42 are connected at the lower connection. A plurality of water inlets are radially arranged on the upper part of the main shaft 41 and connected to the water flow channel 44, and the water inlets are used to supply water to enter the water flow channels 44 in the main shaft 41 and the paddle shaft 42.

[0052] A plurality of first nozzles 421 are provided along the length direction of the pulp shaft 42. The first nozzles 421 are communicated with the water flow channel 44 and can spray water onto the inner side wall of the kettle body 1 to wash the inside of the kettle body 1.

[0053] The water inlet joint 5 is hermetically and rotatably connected to the main shaft 41 through a plurality of bearings. The water inlet joint 5 has an annular water inlet cavity 51 inside. After the water inlet joint 5 is installed, its annular water inlet cavity 51 corresponds to the water inlet and completely covers the area where the water inlet is located; the water inlet joint 5 is then connected to the water inlet pipe 52, and the water inlet pipe 52 supplies water to the annular water inlet cavity 51. Preferably, the water inlet pipe 52 is connected to a booster pump to provide pressurized water flow for the water flow channel 44.

[0054] In this high-salt lithium-containing mother liquor impurity removal reactor, by providing a pulp shaft 42 adapted to the inner wall of the kettle body 1 and arranging a scraper 43 and a first nozzle 421 on the pulp shaft 42, the precipitate on the inner wall of the kettle body 1 can be scraped off, effectively preventing the deposition on the inner wall of the kettle body 1. At the same time, it can spray water onto the inner wall of the kettle body 1, which can well clean the inner wall of the kettle body 1, reduce the number of cleaning times, achieve rapid cleaning, save water, and reduce the maintenance frequency, thereby improving the production efficiency.

[0055] Preferably, as Figures 1 to 3 shown, the scraper 43 is arranged along the length direction of the pulp shaft 42 and is detachably connected to the pulp shaft 42.

[0056] Specifically, in one implementation, the pulp shaft 42 is provided with a slot 422 along the length direction, the scraper 43 is provided with a clamping portion 431 adapted to the slot 422 along the length direction, and the scraper 43 is inserted and limited in the slot 422 from top to bottom through the clamping portion 431; and a detachable end cap 423 is provided at the upper part of the pulp shaft 42. The end cap 423 can be a nut and is threadedly connected to the upper end of the pulp shaft 42. Through the end cap 423, the scraper 43 can be limited in the slot 422 to prevent the scraper 43 from moving along the slot 422.

[0057] The scraper 43 is set to be detachably installed, which is convenient for replacement and maintenance when the scraper 43 is worn. The replacement and installation are convenient, and the structure is simple, and the production and manufacturing are easy.

[0058] Preferably, the scraper 43 is made of fluororubber or fluorosilicone rubber material, which is resistant to acid and alkali corrosion, high temperature, and has appropriate hardness, good toughness, durability, and is not easy to scratch the inner wall of the kettle body 1.

[0059] Furthermore, as Figure 1 shown, the bottom of the kettle body 1 is set as a conical bottom and a discharge port 11 is arranged in the center, which is convenient for the rapid discharge of materials and is not easy to accumulate. At least one second nozzle 412 is arranged at the bottom of the main shaft 41, and the second nozzle 412 faces the discharge port 11. During cleaning, the discharge port 11 can be flushed to effectively clean the discharge port 11, avoid blockage of the discharge port 11, and reduce the manual maintenance frequency.

[0060] Preferably, both the first nozzle 421 and the second nozzle 412 are check nozzles to prevent the reverse flow of materials into the water flow channel 44 during the reaction, which may cause blockage of the first nozzle 421, the second nozzle 412, the water flow channel 44, etc.

[0061] Preferably, as Figure 3 shown, the first nozzle 421 is arranged perpendicular to the length direction of the slurry shaft 42, and its spraying direction deviates from the radial direction of the kettle body 1 and is biased towards the rotation direction of the stirring paddle 4 ( Figure 3 the direction indicated by the arrow in the figure). It can better wash the inner wall of the kettle body 1, with a greater washing force during stirring, and cooperate with the scraper 43 to scrape it in time after flushing, which can better clean the inner wall.

[0062] The reaction kettle further includes a temperature detector 21 and a pH detector 22, which are detachably installed on the cover body 2 and extend downward into the lower part of the kettle body 1 from the cover body 2, and extend into the rotation gap between the main shaft 41 and the slurry shaft 42. The lower part of the slurry shaft 42 is connected to the main shaft 41, and the upper end is a free end, providing a space for the temperature detector 21 and the pH detector 22, ensuring that the temperature detector 21 and the pH detector 22 can extend into the middle and lower parts of the kettle body 1 to accurately detect the temperature and pH value of the reaction solution in the reaction kettle.

[0063] Furthermore, a jacket 6 is provided outside the kettle body 1 of the reaction kettle. The jacket 6 is provided with a heat exchange medium inlet and a heat exchange medium outlet, and first solenoid valves (not shown in the figure) are provided on both the heat exchange medium inlet and the heat exchange medium outlet.

[0064] The cover body 2 is provided with at least five feed ports 23, and the at least five feed ports 23 are respectively used for adding acids (such as sulfuric acid), alkalis (such as sodium hydroxide), oxidants (such as hydrogen peroxide), high-salt lithium-containing mother liquor, precipitants (such as calcium chloride, calcium oxide, magnesium hydroxide), etc. Second solenoid valves (not shown in the figure) are provided on the feed ports 23.

[0065] A third solenoid valve is arranged on the water inlet pipe 52 connected to the water inlet joint 5.

[0066] Furthermore, the reaction kettle further includes a controller (not shown in the figure), which is electrically connected to the stirring motor 3, the temperature detector 21, the pH detector 22, the first solenoid valve, the second solenoid valve, and the third solenoid valve, etc., and can intelligently control the addition of various materials, the reaction temperature of the reaction kettle, and the stirring and cleaning of the reaction kettle, making it more simple and convenient to use.

Claims

1. A high-salt lithium-containing mother liquor impurity removal reactor, characterized in that: include: A kettle body (1) having an openable lid body (2); A stirring motor (3) is arranged on the cover (2); A stirring paddle (4) comprising a main shaft (41) and a paddle shaft (42), wherein the paddle shaft (42) is arranged vertically and parallel to the inner wall of the kettle body (1), the upper portion of the main shaft (41) is drivingly connected to the stirring motor (3), and the lower portion of the main shaft (41) is connected to the lower portion of the paddle shaft (42); A water inlet joint (5) sleeved on the main shaft (41); Wherein, a scraper (43) is provided on the side of the paddle shaft (42) facing the inner wall of the kettle body (1); A water flow channel (44) is provided in the axial direction inside the main shaft (41) and the paddle shaft (42) and is connected to each other; a water inlet is provided radially on the upper part of the main shaft (41) and is connected to the water flow channel (44); a plurality of first nozzles (421) are provided on the paddle shaft (42) along the length direction, the first nozzles (421) are connected to the water flow channel (44) and can spray water toward the inner wall of the kettle body (1); the water inlet joint (5) is rotatably connected to the main shaft (41) via a bearing, the water inlet joint (5) has an annular water inlet cavity (51), the annular water inlet cavity (51) corresponds to the water inlet, and the water inlet joint (5) is connected to a water inlet pipe (52).

2. The high-salt lithium-containing mother liquor impurity removal reactor according to claim 1, characterized in that: The scraper (43) is arranged along the length of the paddle shaft (42) and is detachably connected to the paddle shaft (42).

3. The high-salt lithium-containing mother liquor impurity removal reactor according to claim 2, characterized in that: The paddle shaft (42) is provided with a slot (422) along its length, and the scraper (43) is inserted into the slot (422) from top to bottom via a clamping portion (431); a detachable end cap (423) is provided on the upper part of the paddle shaft (42), and the end cap (423) limits the scraper (43) in the slot (422).

4. The high-salt lithium-containing mother liquor impurity removal reactor according to claim 2 or 3, characterized in that: The scraper (43) is made of fluororubber or fluorosilicone rubber material.

5. The high-salt lithium-containing mother liquor impurity removal reactor according to claim 1, characterized in that: A discharge port (11) is centrally arranged at the bottom of the kettle body (1), and at least one second nozzle (412) is arranged at the bottom of the main shaft (41) facing the discharge port (11).

6. The high-salt lithium-containing mother liquor impurity removal reactor according to claim 5, characterized in that: The first nozzle (421) and the second nozzle (412) are both non-return nozzles.

7. The high-salt lithium-containing mother liquor impurity removal reactor according to claim 1, characterized in that: The first nozzle (421) is arranged perpendicular to the paddle axis (42), and its spraying direction deviates from the radial direction of the kettle body (1) and deviates towards the rotation direction of the stirring paddle (4).

8. The high-salt lithium-containing mother liquor impurity removal reactor according to claim 1, characterized in that: It also comprises a temperature detector (21) and a pH detector (22), wherein the temperature detector (21) and the pH detector (22) are detachably mounted on the cover body (2) and extend downward into the rotation gap between the main shaft (41) and the paddle shaft (42).

9. The high-salt lithium-containing mother liquor impurity removal reactor according to claim 8, characterized in that: The kettle body (1) is provided with a jacket (6) on the outside, the jacket (6) is provided with a heat exchange medium inlet and a heat exchange medium outlet, and the heat exchange medium inlet and the heat exchange medium outlet are both provided with a first solenoid valve; The cover body (2) is provided with at least five feed ports (23), and each of the feed ports (23) is provided with a second solenoid valve; A third solenoid valve is provided on the water inlet pipe (52).

10. The high-salt lithium-containing mother liquor impurity removal reactor according to claim 9, characterized in that: It also includes a controller, which is connected to the stirring motor (3), the temperature detector (21), the pH detector (22), the first solenoid valve, the second solenoid valve and the third solenoid valve.

Images