Weighing and pulping system suitable for hydrogenolysis of lithium carbonate

Abstract

The utility model discloses a weighing and pulping system suitable for hydrogenolysis of lithium carbonate, which comprises a chelating agent preparation tank, a top inlet of which is connected with a chelating agent inlet pipe, and a side wall upper inlet of which is connected with a deionized water inlet pipe; a top inlet of the centrifugal clear liquid tank is connected with a lithium carbonate mother liquid pipe; a chelating agent inlet, a clear liquid inlet and a solid lithium carbonate feeding hole are formed in the top of the lithium carbonate weighing and pulping tank, a lithium carbonate slurry outlet is formed in the bottom, and an overflow hole is formed in the upper part of the side wall; a bottom outlet of the chelating agent preparation tank is connected with a chelating agent inlet of the pulping tank through a chelating agent metering pump; an upper overflow port of the centrifugal clear liquid tank is connected with a clear liquid inlet of the pulping tank through the hot side of the clear liquid heat exchanger; a solid lithium carbonate feeding hole of the pulping tank is connected with an outlet of the belt conveyor; a lithium carbonate slurry outlet of the pulping tank is connected with a lithium carbonate feeding buffer pool, and the bottom of each supporting leg of the pulping tank is provided with a weight sensor. The system can improve the precision, efficiency and product quality of lithium carbonate production.

Description

Technical Field

[0001] The utility model relates to a weighing and pulping system, in particular to a weighing and pulping system suitable for hydrogenation decomposition of lithium carbonate, belonging to the technical field of resource recycling. Background Art

[0002] Lithium carbonate is a commonly used industrial inorganic compound, which can be used in ceramics, drugs, chemical catalysts, etc. At the same time, it is also used as the cathode material of lithium batteries, with advantages such as high energy density, long service life and good stability, and has a very large application prospect and market demand. The hydrogenation decomposition method is the most commonly used process for industrial purification of lithium carbonate at present. How to more efficiently reduce metal impurities in the process of lithium carbonate hydrogenation decomposition has become a research hotspot in the high-efficiency recovery market of lithium carbonate mother liquor.

[0003] The emergence of the lithium carbonate weighing and pulping tank is to solve a series of problems in batching and pulping in the traditional production process. In the previous production, due to the lack of an accurate weighing system, it was difficult to accurately control the ratio of lithium carbonate and other ingredients, resulting in unstable product quality. At the same time, equipment with poor stirring effect could not fully mix lithium carbonate with the solvent, affecting the uniformity of the slurry and the concentration of lithium carbonate products. In addition, traditional equipment also had deficiencies in terms of sealing performance, corrosion resistance, etc., easily causing material leakage and equipment damage, increasing the risks of personal injury and environmental pollution.

[0004] The Chinese utility model patent with the publication number of CN 220634064U discloses a liquid raw material automatic distribution device, including a solution preparation component, a metering component, a mixing mechanism and a control unit, and each component is connected through pipelines. The metering component mainly includes a weighing and metering tank, which is arranged in an inverted cone shape, and is provided with weights and several weight detection mechanisms, and is electrically connected to the control unit. This system can realize chain operation, is simple to operate, realizes accurate metering of the solution, and improves work efficiency. However, the following defects exist in the above technical solution and the existing technology: 1. The weighing system and the stirring system are two separate devices, with redundant design, which will cause too high production costs;

[0005] 2. The weighing and metering tank mainly relies on weights on both sides of the equipment for measurement, with too low measurement accuracy and unable to adapt to the high-salt and high-corrosion environment of the lithium carbonate purification industry;

[0006] 3. The stirring claws are not designed for easy disassembly. Once the stirring shaft fails or becomes fouled, it cannot be disassembled and repaired in time, affecting the stable operation of the system;

[0007] 4. A buffer storage tank is not set downstream of the stirring, resulting in insufficient pulping efficiency and production margin, and unable to adjust the pulping production load when a failure occurs downstream or the production output decreases;

[0008] 5. The solute preparation tank and the weighing and metering tank are not designed with overflow outlets, which are prone to production accidents such as the overflow of the prepared solution, affecting the surrounding environment. Summary of the Invention

[0009] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract of the specification and the title of the utility model of this application, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0010] In view of the above and / or problems existing in the prior art, the present invention is proposed.

[0011] The purpose of the present invention is to overcome the problems existing in the prior art and provide a weighing and pulping system applicable to the hydrogenation decomposition of lithium carbonate, which can effectively avoid impurity ions from entering the lithium carbonate purification process, improve the accuracy, efficiency and product quality of lithium carbonate production, and reduce the cost of industrial purification of lithium carbonate and the environmental protection risk.

[0012] To solve the above technical problems, the weighing and pulping system applicable to the hydrogenation decomposition of lithium carbonate of the present invention includes:

[0013] A chelating agent preparation tank, with a stirring mechanism arranged in the inner cavity, the top inlet is connected to the chelating agent inlet pipe, and the upper side wall inlet is connected to the deionized water inlet pipe;

[0014] A centrifuged clear liquid tank, the top inlet of which is connected to the outlet of the lithium carbonate mother liquor pipe;

[0015] A lithium carbonate weighing and pulping tank, with a stirring mechanism arranged in the inner cavity, a chelating agent inlet, a clear liquid inlet, and a solid lithium carbonate feeding port are arranged at the top, a lithium carbonate slurry outlet is arranged at the bottom, and an overflow port is arranged at the upper part of the side wall;

[0016] The bottom outlet of the chelating agent preparation tank is connected to the chelating agent inlet of the lithium carbonate weighing and pulping tank through a chelating agent metering pump; the upper overflow port of the centrifuged clear liquid tank is connected to the inlet of the clear liquid transfer pump through a clear liquid transfer pipe, the outlet of the clear liquid transfer pump is connected to the hot side inlet of the clear liquid heat exchanger, and the hot side outlet of the clear liquid heat exchanger is connected to the clear liquid inlet of the lithium carbonate weighing and pulping tank; the solid lithium carbonate feeding port of the lithium carbonate weighing and pulping tank is connected to the outlet chute of the belt conveyor;

[0017] The lithium carbonate slurry outlet at the bottom of the lithium carbonate weighing and pulping tank is connected to the inlet of the lithium carbonate feeding buffer tank through a lithium carbonate slurry pipe, and weight sensors are respectively installed at the bottom of each leg of the lithium carbonate weighing and pulping tank.

[0018] Further, the overflow port of the lithium carbonate weighing and pulping tank is connected to the inlet of the lithium carbonate feeding buffer tank through a pulping tank overflow pipe.

[0019] Further, a carbon dioxide flushing port is provided on the side wall of the lithium carbonate slurry outlet at the bottom of the lithium carbonate weighing and slurrying tank and is connected to the outlet of a carbon dioxide flushing pipe.

[0020] Further, a heat preservation jacket is provided on the outer periphery of the middle and lower part of the lithium carbonate weighing and slurrying tank. The heat preservation liquid inlet at the bottom of the heat preservation jacket is connected to a heat preservation liquid inlet pipe, and the heat preservation liquid outlet at the top of the heat preservation jacket is connected to a heat preservation liquid outlet pipe.

[0021] Further, the heat preservation liquid inlet pipe is also connected to the flushing pipe of the belt conveyor.

[0022] Further, the upper end of the stirring shaft of the lithium carbonate weighing and slurrying tank extends out of the top cover and is driven by a stirring motor. A bottom-fixed stirring frame is installed at the lower end of the stirring shaft, and a detachable stirring frame is installed in the middle of the stirring shaft.

[0023] Further, a radar level gauge for detecting the liquid level in the tank is installed on the top cover of the lithium carbonate weighing and slurrying tank.

[0024] Further, a lithium carbonate solid dispersion plate is provided below the solid lithium carbonate feeding port of the lithium carbonate weighing and slurrying tank.

[0025] Further, a top lifting hoist is provided above the top cover of the lithium carbonate weighing and slurrying tank.

[0026] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. This system integrates advanced weighing technology and an efficient stirring device, meets the increasingly strict production standards and market demands, is applicable to the efficient purification of wet industrial-grade lithium carbonate, improves the recycling rate of system lithium carbonate to more than 98%, and makes the produced lithium carbonate product purer and meet the requirements of qualified products in YS / T582-2013 "Lithium Carbonate for Batteries". It realizes the efficient recycling and utilization of lithium carbonate in the lithium carbonate purification industry, improves the lithium carbonate utilization rate, system stability and the purity of lithium carbonate products, and promotes the green and healthy development of China's lithium carbonate-related industries.

[0027] 2. There are three main incoming materials for the lithium carbonate weighing and pulping tank: First, the chelating agent solution, which is prepared from deionized water and nitrilotriacetic acid (NTA) chelating agent in the chelating agent preparation tank. Second, the recycled clear liquid of lithium carbonate, which comes from the overflow mother liquor of lithium carbonate production, is precipitated in the centrifugal clear liquid tank, and finally the cleanest lithium carbonate clear liquid on the top layer is separated. Third, the industrial-grade lithium carbonate solid material is transported by the upstream industrial-grade lithium carbonate transport vehicle and then sent to the lithium carbonate weighing and pulping tank through a belt conveyor. The lithium carbonate and the liquid-phase solvent are proportioned at a solid-liquid ratio of 1.6:1, and the slurry mixing and chelating agent complexation are completed through about 60 minutes of stirring. The lithium carbonate slurry falls into the lithium carbonate feed buffer pool for buffering, increasing the operation efficiency and proportioning margin of weighing and pulping;

[0028] 3. The solid lithium carbonate feeding port of the lithium carbonate weighing and pulping tank is designed in a funnel shape, which is more convenient for collecting the lithium carbonate incoming material from the upstream belt conveyor, preventing environmental pollution and lithium resource loss caused by flying salt;

[0029] 4. The side of the lithium carbonate weighing and pulping tank is designed with an overflow port, which can prevent the liquid in the lithium carbonate weighing and pulping tank from overflowing and causing production accidents; at the same time, the overflow port is also designed with an overflow collection tank, which can further collect the lithium carbonate solid in the overflow port and be cleaned regularly to achieve the effective recovery of lithium resources;

[0030] 5. The lower part of the solid lithium carbonate feeding port of the lithium carbonate weighing and pulping tank is also designed with a lithium carbonate solid dispersion plate, which can effectively disperse the upstream solid lithium carbonate incoming material and prevent the solid lithium carbonate from caking, affecting the mixing effect of the pulping tank;

[0031] 6. The bottom of the lithium carbonate weighing and pulping tank is also designed with a carbon dioxide flushing port, which can regularly introduce clean carbon dioxide into the pulping tank for flushing to prevent the lithium carbonate from sticking to the surface of the pulping tank and the stirring frame and affecting the pulping efficiency;

[0032] 7. This system is equipped with a chelating agent preparation tank. Considering the cost, toxicity and recyclability of the chelating agent comprehensively, nitrilotriacetic acid (NTA) is used as the chelating agent for the purification of industrial-grade lithium carbonate. The solvent of the chelating agent preparation tank is deionized water, which is provided by the upstream pretreatment unit, effectively avoiding the entry of impurity ions into the production process of lithium carbonate purification. The addition amount of the chelating agent is 6 times the total weight of the solid impurity ions of lithium carbonate, enabling the metal ions in the lithium carbonate weighing and pulping tank to undergo a chelation reaction with the nitrilotriacetic acid (NTA) chelating agent to form a stable complex, improving the separation efficiency and purification effect of impurity ions;

[0033] 8. The system is designed with a heat preservation device for the lithium carbonate weighing and pulping tank. The optimal complexation temperature of nitrilotriacetic acid (NTA) chelating agent and lithium carbonate solid is about 25°C. Higher or lower than this temperature will reduce the efficiency of the chelation reaction. When the ambient temperature is high in summer, low-temperature cooling water is passed into the heat preservation jacket of the lithium carbonate weighing and pulping tank for cooling; when the ambient temperature is low in winter, heated warm water is passed into the heat preservation jacket of the lithium carbonate weighing and pulping tank for heating, so that the lithium carbonate weighing and pulping tank always maintains the optimal reaction temperature of 25°C, maximizing the complexation effect of the chelating agent and impurity metal ions, and improving the quality of battery-grade lithium carbonate produced;

[0034] 9. The remaining heat of the lithium carbonate clear liquid is also recovered through a clear liquid heat exchanger to ensure that the clear liquid entering the lithium carbonate pulping tank maintains a low temperature, realizing efficient proportioning and pulping of lithium carbonate;

[0035] 10. The system is equipped with resistive weight sensors at the bottoms of the four legs of the lithium carbonate weighing and pulping tank to measure the weight of the lithium carbonate weighing and pulping tank. The material of the lithium carbonate weighing and pulping tank is 316L, with an empty weight of 30t and a full-load total weight of about 50t. Therefore, the range of each resistive weight sensor is selected as 5 - 15t. A radar level gauge is also installed at the top of the lithium carbonate weighing and pulping tank, which can non-contact measure the real-time liquid level of the lithium carbonate weighing and pulping tank. The central control room obtains the weight and liquid level data of the lithium carbonate slurry in the tank in real time through the resistive weight sensors and the radar level gauge, thereby mastering the solid-liquid ratio of lithium carbonate in the pulping tank to achieve precise batching and process control;

[0036] 11. The system is designed with a stirring device for the lithium carbonate weighing and pulping tank. The stirring device is connected to the equipment top cover by bolts, which can be disassembled and assembled conveniently, and is hoisted by a top-mounted hoist for quick maintenance; the stirring shaft is equipped with a detachable stirring frame and a bottom-fixed stirring frame, and the detachable stirring frame can be disassembled and assembled according to the process ratio requirements to achieve the best stirring and mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings. The drawings are only for reference and explanation, and are not used to limit the present invention. Among them:

[0038] Figure 1 is the flow chart of the weighing and pulping system applicable to the hydrogenation decomposition of lithium carbonate of the present invention;

[0039] Figure 2 is the three-dimensional view of the lithium carbonate weighing and pulping tank of the present invention;

[0040] Figure 3 This is a cross-sectional view of the lithium carbonate weighing and pulping tank in the present utility model;

[0041] In the figure: 1. Chelating agent preparation tank; 2. Centrifuged clear liquid tank; 3. Clear liquid heat exchanger; 4. Lithium carbonate weighing and pulping tank; 5. Lithium carbonate feed buffer tank; 6. Belt conveyor; 7. Industrial-grade lithium carbonate transporter;

[0042] Lithium carbonate weighing and pulping tank: 4a. Stirring motor; 4b. Radar level gauge; 4c. Chelating agent inlet; 4d. Tank top stiffener; 4e. Pulping tank body; 4f. Clear liquid inlet; 4g. Maintenance manhole; 4h. Solid lithium carbonate feeding port; 4i. Overflow port; 4j. Overflow collection tank; 4k. Insulation jacket; 4m. Insulation liquid inlet; 4n. Resistive weight sensor; 4p. Stirring shaft; 4q. Insulation liquid outlet; 4r. Removable stirring frame; 4s. Bottom-fixed stirring frame; 4t. Lithium carbonate slurry outlet; 4u. Carbon dioxide flushing port; 4v. Lithium carbonate solid dispersion plate; 4w. Top lifting hoist;

[0043] B1. Chelating agent metering pump; B2. Clear liquid transfer pump; B3. Buffer tank sewage pump;

[0044] G1. Chelating agent inlet pipe; G2. Deionized water inlet pipe; G3. Insulation liquid outlet pipe; G4. Lithium carbonate mother liquor pipe; G5. Chelating agent solution inlet pipe; G6. Clear liquid transfer pipe; G7. Pulping tank overflow pipe; G8. Insulation liquid inlet pipe; G9. Carbon dioxide flushing pipe; G10. Lithium carbonate slurry pipe; G11. Buffer tank sewage pipe. Detailed implementation manners

[0045] In the following description of the present utility model, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating that the device must have a specific orientation.

[0046] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below with reference to specific drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model in this specification are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model.

[0048] As shown Figure 1 in the figure, the utility model is applicable to a weighing and pulping system for the hydrogenation decomposition of lithium carbonate, including a chelating agent preparation tank 1, a centrifugal clear liquid tank 2, a lithium carbonate weighing and pulping tank 4, a belt conveyor 6 and a lithium carbonate feed buffer tank 5. A stirring mechanism is arranged in the inner cavity of the chelating agent preparation tank 1. The top inlet of the chelating agent preparation tank 1 is connected to a chelating agent inlet pipe G1, and the upper side inlet of the side wall of the chelating agent preparation tank 1 is connected to a deionized water inlet pipe G2. The outlet of the lithium carbonate mother liquor pipe G4 is connected to the top inlet of the centrifugal clear liquid tank 2.

[0049] A stirring mechanism is arranged in the inner cavity of the lithium carbonate weighing and pulping tank 4. The top is provided with a chelating agent inlet 4c, a clear liquid inlet 4f, and a solid lithium carbonate feeding port 4h. The upper part of the side wall of the tank body is provided with an overflow port 4i, the bottom of the tank body is provided with a lithium carbonate slurry outlet 4t, and the side wall of the lithium carbonate slurry outlet 4t is provided with a carbon dioxide flushing port 4u. A lithium carbonate solid dispersion plate 4v is arranged below the solid lithium carbonate feeding port 4h of the lithium carbonate weighing and pulping tank 4. The outer periphery of the middle and lower part of the lithium carbonate weighing and pulping tank 4 is provided with a heat preservation jacket 4k. The heat preservation liquid inlet 4m at the bottom of the heat preservation jacket 4k is connected to a heat preservation liquid inlet pipe G8, and the heat preservation liquid outlet 4q at the top of the heat preservation jacket 4k is connected to a heat preservation liquid outlet pipe G3.

[0050] The bottom outlet of the chelating agent preparation tank 1 is connected to the chelating agent inlet 4c of the lithium carbonate weighing and pulping tank 4 through a chelating agent metering pump B1. The upper overflow port 4i of the centrifugal clear liquid tank 2 is connected to the inlet of a clear liquid conveying pump B2 through a clear liquid conveying pipe G6. The outlet of the clear liquid conveying pump B2 is connected to the hot side inlet of a clear liquid heat exchanger 3. The hot side outlet of the clear liquid heat exchanger 3 is connected to the clear liquid inlet 4f of the lithium carbonate weighing and pulping tank 4.

[0051] The solid lithium carbonate feeding port 4h of the lithium carbonate weighing and pulping tank 4 is connected to the outlet chute of the belt conveyor 6. The flushing pipe of the belt conveyor 6 is connected to the heat preservation liquid inlet pipe G8.

[0052] The lithium carbonate slurry outlet 4t at the bottom of the lithium carbonate weighing and pulping tank 4 is connected to the inlet of the lithium carbonate feed buffer tank 5 through a lithium carbonate slurry pipe G10. The overflow port 4i of the lithium carbonate weighing and pulping tank 4 is also connected to the inlet of the lithium carbonate feed buffer tank 5 through a pulping tank overflow pipe G7. The side wall of the lithium carbonate slurry outlet 4t at the bottom of the lithium carbonate weighing and pulping tank 4 is connected to the outlet of a carbon dioxide flushing pipe G9.

[0053] The lithium carbonate weighing and pulping tank 4 has three main incoming materials: The first incoming material is the chelating agent solution. The nitrilotriacetic acid chelating agent, i.e., NTA, enters the chelating agent preparation tank 1 through the chelating agent inlet pipe G1. The addition amount of the chelating agent is 6 times the total weight of the impurity ions in lithium carbonate, which can more efficiently cause the metal ions in the lithium carbonate weighing and pulping tank 4 to undergo a chelation reaction with the chelating agent. The upstream pretreatment unit of the device provides deionized water, which enters the chelating agent preparation tank 1 through the deionized water inlet pipe G2 as a preparation solvent, effectively avoiding the entry of impurity ions into the production process of lithium carbonate purification. The prepared chelating agent solution is sent out through the chelating agent metering pump B1 and the chelating agent solution inlet pipe G5, and enters the lithium carbonate weighing and pulping tank 4 from the chelating agent inlet 4c.

[0054] The second incoming material of the lithium carbonate weighing and pulping tank 4 is the recycled clear liquid of lithium carbonate. The lithium carbonate mother liquor produced by the device enters the centrifugal clear liquid tank 2 through the lithium carbonate mother liquor pipe G4 for solid-liquid separation and precipitation; the upper lithium carbonate clear liquid is sent out through the clear liquid transfer pump B2 and the clear liquid transfer pipe G6, and enters the lithium carbonate weighing and pulping tank 4 through the clear liquid inlet 4f.

[0055] The remaining heat of the lithium carbonate clear liquid is recovered through the clear liquid heat exchanger 3 to ensure that the clear liquid entering the lithium carbonate weighing and pulping tank 4 maintains a relatively low temperature, realizing efficient pulping of lithium carbonate.

[0056] The third incoming material of the lithium carbonate weighing and pulping tank 4 is the industrial-grade lithium carbonate solid material. The qualified industrial-grade lithium carbonate is transported by the upstream industrial-grade lithium carbonate transport vehicle 7, and then sent into the solid lithium carbonate feeding port 4h of the lithium carbonate weighing and pulping tank 4 through the belt conveyor 6, and is dispersed by the lithium carbonate solid dispersion plate 4v at the lower part of the solid lithium carbonate feeding port 4h to ensure the mixing ratio effect of lithium carbonate.

[0057] In the lithium carbonate weighing and pulping tank 4, the solid lithium carbonate and the liquid-phase solvent are stirred and mixed at a solid-liquid ratio of 1.6:1. After about 60 minutes of stirring, the pulp preparation and chelating agent complexation are completed; it is discharged through the lithium carbonate slurry outlet 4t at the bottom of the tank and enters the lithium carbonate feed buffer tank 5 for buffering, increasing the operation efficiency and mixing ratio margin of weighing and pulping.

[0058] The insoluble waste at the bottom of the lithium carbonate feed buffer tank 5 is regularly discharged externally through the buffer tank sewage pump B3 via the buffer tank sewage pipe G11 to ensure the sustainable production of the device and environmental protection requirements. Clean carbon dioxide is regularly introduced into the lithium carbonate weighing and pulping tank 4 through the carbon dioxide flushing pipe G9 and the carbon dioxide flushing port 4u to prevent the lithium carbonate from adhering to the inner wall of the pulping tank and the stirring frame, which affects the pulping efficiency. The clean water heat preservation liquid enters the heat preservation jacket 4k of the lithium carbonate weighing and pulping tank 4 through the heat preservation liquid inlet pipe G8 and from the heat preservation liquid inlet 4m for heat preservation. The heat-exchanged heat preservation liquid is discharged externally through the heat preservation liquid outlet 4q at the top and sent to a reasonable area through the heat preservation liquid outlet pipe G3. A branch is also separated from the heat preservation liquid inlet pipe G8 to flush the belt conveyor 6 to prevent the lithium carbonate from adhering to the belt conveyor rollers, causing the belt conveyor to deviate and jam.

[0059] As Figure 2 , Figure 3 shown, a top lifting hoist 4w is installed on the upper part of the lithium carbonate weighing and pulping tank 4, which is convenient for hoisting and overhauling the stirring device. Radar level gauges 4b, chelating agent inlets 4c, solid lithium carbonate feeding ports 4h, maintenance manholes 4g, clear liquid inlets 4f, and stirring motors 4a are distributed on the top of the lithium carbonate weighing and pulping tank 4, and are reinforced by the tank top reinforcing ribs 4d. Among them, the stirring motor 4a is located at the center of the tank top and is connected to the tank top by bolts, which is convenient for motor disassembly and overhaul.

[0060] The tank body 4e of the pulping tank and the heat preservation jacket 4k are both made of 316L material to ensure that corrosion and pollution will not occur during the treatment of lithium carbonate, and can also extend the service life of the equipment. The heat preservation jacket 4k wraps the reaction area below the middle of the lithium carbonate weighing and pulping tank to ensure that the reaction temperature of the chelating agent and lithium carbonate in the tank is maintained at about 25°C. The clean water heat preservation liquid enters from the heat preservation liquid inlet 4m, and the heat-exchanged heat preservation liquid is discharged externally through the heat preservation liquid outlet 4q at the top of the heat preservation jacket 4k. The lower part of the stirring motor 4a is connected with a stirring shaft 4p, and the stirring shaft 4p is connected with a detachable stirring frame 4r and a bottom fixed stirring frame 4s. The detachable stirring frame 4r can be disassembled and assembled according to the process ratio requirements to achieve a good mixing effect. An overflow port 4i is designed on the side of the lithium carbonate weighing and pulping tank 4 to prevent the liquid in the lithium carbonate weighing and pulping tank from overflowing and causing production accidents; at the same time, an overflow collection tank 4j is also designed at the overflow port 4i, which can further collect the lithium carbonate solid in the overflow port and be cleaned regularly to achieve the effective recovery of lithium resources.

[0061] The bottom of the lithium carbonate weighing and pulping tank is supported by four pulping tank legs. At the same time, a resistive weight sensor 4n is installed at the bottom of each leg to measure the weight of the lithium carbonate weighing and pulping tank. The material of the lithium carbonate weighing and pulping tank 4 is 316L, with an empty weight of 30t and a full-load total weight of about 50t. Therefore, the range of each resistive weight sensor is selected as 5 - 15t. A radar level gauge 4b is also installed at the top of the lithium carbonate weighing and pulping tank 4, which can measure the real-time liquid level of the lithium carbonate weighing and pulping tank without contact. The central control room obtains the weight and liquid level data of the lithium carbonate slurry in the tank in real time through the resistive weight sensor 4n and the radar level gauge 4b, thereby mastering the solid-liquid ratio of lithium carbonate in the pulping tank to achieve precise batching and process control.

[0062] The above is only the preferred and feasible embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. It does not limit the patent protection scope of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. Except for the above embodiments, without departing from the spirit and scope of the present invention, the present invention can also have other implementation manners. The present invention will also have various changes and improvements. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention. The protection scope required by the present invention is defined by the appended claims and their equivalents. The technical features not described in the present invention can be realized by or adopted from the prior art, and will not be elaborated here.

Claims

1. A weighing and pulping system applicable to the hydrogenation decomposition of lithium carbonate, characterized in that, Comprising: A chelating agent preparation tank, with a stirring mechanism inside the cavity, the top inlet is connected to the chelating agent inlet pipe, and the upper sidewall inlet is connected to the deionized water inlet pipe; A centrifugal clear liquid tank, the top inlet of which is connected to the outlet of the lithium carbonate mother liquor pipe; A lithium carbonate weighing and pulping tank, with a stirring mechanism inside the cavity, a chelating agent inlet, a clear liquid inlet, and a solid lithium carbonate feeding port at the top, a lithium carbonate slurry outlet at the bottom, and an overflow port at the upper part of the sidewall; The bottom outlet of the chelating agent preparation tank is connected to the chelating agent inlet of the lithium carbonate weighing and pulping tank through a chelating agent metering pump; the upper overflow port of the centrifugal clear liquid tank is connected to the inlet of the clear liquid transfer pump through a clear liquid transfer pipe, the outlet of the clear liquid transfer pump is connected to the hot side inlet of the clear liquid heat exchanger, and the hot side outlet of the clear liquid heat exchanger is connected to the clear liquid inlet of the lithium carbonate weighing and pulping tank; the solid lithium carbonate feeding port of the lithium carbonate weighing and pulping tank is connected to the outlet chute of the belt conveyor; The lithium carbonate slurry outlet at the bottom of the lithium carbonate weighing and pulping tank is connected to the inlet of the lithium carbonate feed buffer tank through a lithium carbonate slurry pipe, and weight sensors are respectively installed at the bottom of each leg of the lithium carbonate weighing and pulping tank.

2. The weighing and pulping system applicable to the hydrogenation decomposition of lithium carbonate according to claim 1, wherein: The overflow port of the lithium carbonate weighing and pulping tank is connected to the inlet of the lithium carbonate feed buffer tank through a pulping tank overflow pipe.

3. The weighing and pulping system applicable to the hydrogenation decomposition of lithium carbonate according to claim 1, wherein: A carbon dioxide flushing port is provided on the sidewall of the lithium carbonate slurry outlet at the bottom of the lithium carbonate weighing and pulping tank and is connected to the outlet of the carbon dioxide flushing pipe.

4. The weighing and pulping system applicable to the hydrogenation decomposition of lithium carbonate according to claim 1, characterized in that: A heat preservation jacket is provided on the outer periphery of the middle and lower part of the lithium carbonate weighing and pulping tank, the heat preservation liquid inlet at the bottom of the heat preservation jacket is connected to the heat preservation liquid inlet pipe, and the heat preservation liquid outlet at the top of the heat preservation jacket is connected to the heat preservation liquid outlet pipe.

5. The weighing and pulping system applicable to the hydrogenation decomposition of lithium carbonate according to claim 4, wherein: The heat preservation liquid inlet pipe is also connected to the flushing pipe of the belt conveyor.

6. The weighing and pulping system applicable to the hydrogenation decomposition of lithium carbonate according to claim 1, wherein: The upper end of the stirring shaft of the lithium carbonate weighing and pulping tank extends out of the top cover and is driven by a stirring motor, a bottom-fixed stirring frame is installed at the lower end of the stirring shaft, and a detachable stirring frame is installed in the middle of the stirring shaft.

7. The weighing and pulping system applicable to the hydrogenation decomposition of lithium carbonate according to claim 1, characterized in that: A radar level gauge for detecting the liquid level in the tank is installed on the top cover of the lithium carbonate weighing and pulping tank.

8. The weighing and pulping system applicable to the hydrogenation decomposition of lithium carbonate according to claim 1, wherein: A lithium carbonate solid dispersion plate is provided below the solid lithium carbonate feeding port of the lithium carbonate weighing and pulping tank.

9. The weighing and pulping system applicable to the hydrogenation decomposition of lithium carbonate according to claim 1, characterized in that: A top lifting hoist is provided above the top cover of the lithium carbonate weighing and pulping tank.

Images