Lithium carbonate slurry continuous demagnetizing system based on principle of generating magnetic field by electromagnetic induction

Abstract

The utility model provides a lithium carbonate slurry continuous demagnetizing system based on the principle that a magnetic field is generated by electromagnetic induction, which relates to the technical field of lithium carbonate production and comprises a circulation loop, a material jacking unit and a deslagging unit, and the circulation loop is composed of a lithium carbonate slurry storage tank, a feeding pump and a demagnetizing device. According to the method, lithium carbonate slurry is uniformly and stably input into a demagnetizing device with the magnetic field intensity of 1000-15000 Gs for continuous circulating demagnetizing, the switching time is determined according to the content of magnetic substances in the slurry, and the lithium carbonate slurry in the demagnetizing device is returned to an upper-stage process system through reaction filtrate for recycling through automatic control. After material ejection is completed, the system automatically closes a material ejection pipeline valve, switches to a slag discharge valve and cuts off exciting current at the same time, and magnetic substances on the magnetic gathering screen are washed and discharged with pure water according to slag discharge set time, so that the purpose of continuously removing the magnetic substances from the lithium carbonate slurry is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium carbonate production, and in particular to a lithium carbonate slurry continuous demagnetization system based on the principle of generating a magnetic field by electromagnetic induction. Background Art

[0002] With the rapid development of the new energy industry, lithium carbonate, as an important lithium salt product, has been widely used in battery manufacturing, aerospace, military industry, ceramics, glass and other fields. Salt lake lithium extraction technology is one of the main ways to develop lithium resources. Its main process is to extract lithium from brine by adsorption, and obtain lithium carbonate products through a series of process steps.

[0003] However, in the process of extracting lithium from salt lakes, lithium carbonate slurry often contains impurities such as magnetic foreign matter, which have an adverse effect on the quality and purity of battery-grade lithium carbonate products. Currently, the commonly used demagnetization methods include particle magnetic separators and pipeline magnetic filters, but there are problems such as large equipment size, unsatisfactory demagnetization effect, and inability to demagnetize continuously.

[0004] At present, the devices for removing magnetic substances on the market mainly include particle magnetic separators and pipeline magnetic filters, but they have the disadvantages of not being able to remove magnetic substances continuously or not meeting the expected effect due to unreasonable structural design. No one has tried to achieve continuous removal of magnetic substances in lithium carbonate slurry. Utility Model Content

[0005] Based on the above problems, the utility model proposes a lithium carbonate slurry continuous demagnetization system based on the principle of electromagnetic induction to generate magnetic field, aiming to solve the problems of large volume, unsatisfactory demagnetization effect, and inability to demagnetize continuously in traditional demagnetization methods, improve the quality and purity of lithium carbonate products, reduce production costs, and realize the automation and efficiency of the lithium carbonate production process. The specific technical solution is as follows:

[0006] The utility model provides a lithium carbonate slurry continuous demagnetization system based on the principle of electromagnetic induction to generate a magnetic field, comprising a circulation loop formed by a lithium carbonate slurry storage tank, a feed pump, and a demagnetization device, wherein the bottom of the lithium carbonate slurry storage tank is connected to a feed port of the demagnetization device through a feed pump, the demagnetization device is placed high above the lithium carbonate slurry storage tank, and a discharge port of the demagnetization device is connected to an inlet above the lithium carbonate slurry storage tank, wherein a feed valve is provided on a pipeline between the feed pump and the feed port of the demagnetization device, and a discharge valve is provided on a pipeline between the discharge port of the demagnetization device and the lithium carbonate slurry storage tank;

[0007] At the same time, the utility model also includes a feeding unit, including a feeding liquid inlet valve connected to the feeding port of the demagnetization device, the feeding port of the demagnetization device is connected to the feeding pipeline, the feeding pipeline is connected to the upper process system of the lithium carbonate production process, and a feeding valve is arranged on the feeding pipeline. The feeding unit is used to close the feed pump, the feeding valve and the discharging valve, open the feeding liquid inlet valve and the feeding valve, and push the slurry in the demagnetization device to the upper process system for recycling and reuse through the feeding liquid after the system continuously circulates demagnetization for a period of time;

[0008] At the same time, the utility model also includes a slag discharge unit, including a pure water inlet valve connected to the feed port of the demagnetization device. A discharge port is provided below the demagnetization device, which is connected to the slag discharge valve. The slag discharge unit is used to close the top material inlet valve and the top material valve, open the slag discharge valve, and disconnect the excitation current at the same time after the top material is completed, and use pure water to flush and discharge the magnetic material on the magnetic screen.

[0009] Furthermore, the demagnetization device removes magnetic substances in the lithium carbonate production process through the principle of electromagnetic induction of excitation current to generate a magnetic field. The magnetic field strength is 1000 to 15000 Gs. A magnetic screen is provided inside the demagnetization device to capture magnetic substances in the lithium carbonate slurry.

[0010] Furthermore, the system provided by the utility model also includes an automatic control system for monitoring the demagnetization time and controlling the switching of the feed pump, the feed valve and the discharge valve, as well as the operation of the top feed unit and the slag discharge unit according to preset parameters.

[0011] Furthermore, the magnetic materials that can be demagnetized in the present invention include but are not limited to iron, chromium, nickel, and cobalt.

[0012] Furthermore, the solid content of the lithium carbonate slurry in the lithium carbonate slurry storage tank is between 15% and 45%.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] The utility model utilizes the principle of electromagnetic induction to generate a magnetic field to achieve continuous demagnetization of magnetic substances in lithium carbonate slurry, effectively improves the demagnetization efficiency, and ensures the continuity and stability of the production process.

[0015] The utility model is equipped with an automatic control system, which can set the switching time according to the content of magnetic substances in the slurry, automatically control the feeding, pushing and slag discharge operations, simplify the operation process and improve the production efficiency.

[0016] The utility model has a demagnetization rate of more than 95% for lithium carbonate slurry, which can effectively remove magnetic substances. At the same time, through continuous demagnetization technology, it can effectively reduce material waste in the production process, and recycle the demagnetized lithium carbonate slurry, thereby improving resource utilization and reducing production costs.

[0017] The utility model adopts the principle of electromagnetic induction to generate magnetic field. Compared with the traditional chemical treatment method, it does not need to use a large amount of chemical agents, reduces pollution to the environment, reduces energy consumption, and conforms to the development trend of environmental protection and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a process flow chart in an embodiment of the utility model.

[0019] Figure numerals: lithium carbonate slurry tank 1; feed pump 2; demagnetization device 3; feed valve 4; discharge valve 5; top feed liquid inlet valve 6; top feed valve 7; pure water inlet valve 8; slag discharge valve 9. DETAILED DESCRIPTION

[0020] Hereinafter, the technology in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them; based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0021] Reference Figure 1 The utility model proposes a continuous demagnetization system for lithium carbonate slurry based on the principle of electromagnetic induction to generate a magnetic field, comprising a circulation loop formed by a lithium carbonate slurry storage tank 1, a feeding pump 2, and a demagnetization device 3, wherein the bottom of the lithium carbonate slurry storage tank 1 is connected to the feed port of the demagnetization device 3 through the feeding pump, the demagnetization device 3 is placed high above the lithium carbonate slurry storage tank 1, and the discharge port of the demagnetization device 3 is connected to the upper inlet of the lithium carbonate slurry storage tank 1, wherein a feed valve 4 is provided on the pipeline between the feeding pump 2 and the feed port of the demagnetization device 3, and a discharge valve 5 is provided on the pipeline between the discharge port of the demagnetization device 3 and the lithium carbonate slurry storage tank 1; at the same time, the system also includes a top feeding unit, including a top feeding liquid inlet valve 6 connected to the feed port of the demagnetization device 3, the discharge port of the demagnetization device is connected to the top feeding pipeline, and the top feeding pipeline The upper process system connected to the lithium carbonate production process has a top-loading valve 7 on the top-loading pipeline. The top-loading unit is used to close the feed pump 2, the feed valve 4 and the discharge valve 5, open the top-loading liquid inlet valve 6 and the top-loading valve 7 after the system has been continuously circulated for demagnetization for a period of time, and push the slurry in the demagnetization device 3 to the upper process system for recycling and reuse through the top-loading liquid; at the same time, the system also includes a slag discharge unit, including a pure water inlet valve 8 connected to the feed port of the demagnetization device 3, and a discharge port is provided below the demagnetization device 3, which is connected to the slag discharge valve 9. The slag discharge unit is used to close the top-loading liquid inlet valve 6 and the top-loading valve 7, open the slag discharge valve 8, and disconnect the excitation current of the demagnetization device 3 after the top-loading is completed, so as to flush and discharge the magnetic material on the magnetic screen inside the demagnetization device 3 with pure water.

[0022] Preferably, the demagnetization device 3 in the system removes magnetic substances in the lithium carbonate production process through the principle of generating a magnetic field by electromagnetic induction of an excitation current. The magnetic field strength is 1000 to 15000 Gs. A magnetic collecting screen is provided inside the demagnetization device 3 to capture magnetic substances in the lithium carbonate slurry.

[0023] Preferably, the system also includes an automatic control system for monitoring the demagnetization time and controlling the switching of the feed pump 2, the feed valve 3 and the discharge valve 4, as well as the switching operation of each valve of the top material unit and the slag discharge unit according to preset parameters.

[0024] Preferably, the magnetic materials that can be demagnetized by the system include but are not limited to iron, chromium, nickel, and cobalt.

[0025] Preferably, the solid content of the lithium carbonate slurry entering the lithium carbonate slurry storage tank 1 is between 15% and 45%.

[0026] The working principle of the present utility model is described below in conjunction with embodiments.

[0027] Embodiment 1:

[0028] First, lithium carbonate slurry with a solid content of 15% is fed through a feed pump 2 and a demagnetization device feed valve 4 at a rate of 40 m / s. 3 / h flow rate is smoothly transported to the demagnetization device 3 with a magnetic field strength of 1000-15000Gs. The magnetic content in the inlet slurry of the demagnetization device 3 is: 9000PPb, and the magnetic content in the outlet slurry is 65PPb. Then the continuous cycle demagnetization is carried out. According to the magnetic content of 9000PPb in the slurry, the switching time is set to 15min. The interlocking system will automatically close the feed pump 2, the feed valve 3 and the discharge valve 4, open the top liquid inlet valve 6 and the top valve 7, and push the reaction liquid, that is, the top liquid, to the upper system for recycling and reuse. After the top material is completed, the system will automatically close the top material pipeline valve, switch to the slag discharge valve 9, and disconnect the excitation current at the same time. The slag discharge time is set to 120s. Open the pure water inlet valve 8, and the pure water will flush and discharge the magnetic material on the magnetic screen.

[0029] Embodiment 2:

[0030] First, lithium carbonate slurry with a solid content of 40% is fed through a feed pump 2 and a demagnetization device feed valve 4 at a rate of 25 m / s. 3 / h flow rate is smoothly transported to the demagnetization device 3 with a magnetic field strength of 1000-15000Gs. The magnetic content in the inlet slurry of the demagnetization device 3 is: 7500PPb, and the magnetic content in the outlet slurry is 95PPb. Then the continuous cycle demagnetization is carried out. According to the magnetic content of 7500PPb in the slurry, the switching time is set to 12min. The interlocking system will automatically close the feeder, the feed valve 4 and the discharge valve 5, open the top material liquid inlet valve 6 and the top material valve 7, and the reaction liquid, that is, the top material liquid, will push the lithium carbonate slurry in the demagnetization device 3 to the upper system for recycling and reuse. After the top material is completed, the system will automatically close the top material pipeline valve, switch to the slag discharge valve 9, and disconnect the excitation current at the same time. The slag discharge time is set to 120s. Open the pure water inlet valve 8, and the pure water will flush and discharge the magnetic material on the magnetic screen.

Claims

1. A lithium carbonate slurry continuous demagnetization system based on the principle of electromagnetic induction to generate magnetic field, characterized in that: The system includes a circulation loop consisting of a lithium carbonate slurry storage tank, a feed pump, and a demagnetization device, wherein the bottom of the lithium carbonate slurry storage tank is connected to the feed port of the demagnetization device through the feed pump, the demagnetization device is placed above the lithium carbonate slurry storage tank, and the discharge port of the demagnetization device is connected to the inlet above the lithium carbonate slurry storage tank, wherein a feed valve is provided on the pipeline between the feed pump and the feed port of the demagnetization device, and a discharge valve is provided on the pipeline between the discharge port of the demagnetization device and the lithium carbonate slurry storage tank; The system also includes a feed unit, including a feed liquid inlet valve connected to the feed port of the demagnetization device, the feed outlet of the demagnetization device is connected to a feed pipeline, the feed pipeline is connected to the upper process system of the lithium carbonate production process, and a feed valve is provided on the feed pipeline; The system also includes a slag discharge unit, including a pure water inlet valve connected to the feed port of the demagnetization device, and a discharge port is arranged below the demagnetization device, and the discharge port is connected to the slag discharge valve through a pipeline.

2. A lithium carbonate slurry continuous demagnetization system based on the principle of electromagnetic induction to generate a magnetic field according to claim 1, characterized in that: The demagnetization device generates a magnetic field through electromagnetic induction of an excitation current, and the magnetic field strength is 1000 to 15000 Gs. A magnetic field collecting screen is arranged inside the demagnetization device to capture magnetic substances in the lithium carbonate slurry.

3. A lithium carbonate slurry continuous demagnetization system based on the principle of electromagnetic induction to generate a magnetic field according to claim 2, characterized in that: The system also includes an automatic control system, which is used to monitor the demagnetization time and control the switching of the feed pump, the feed valve and the discharge valve according to preset parameters, as well as the corresponding operations of the feed unit and the slag discharge unit.

4. A lithium carbonate slurry continuous demagnetization system based on the principle of electromagnetic induction to generate a magnetic field according to claim 3, characterized in that: The system can remove magnetic substances including iron, chromium, nickel and cobalt in lithium carbonate slurry.

5. A lithium carbonate slurry continuous demagnetization system based on the principle of electromagnetic induction to generate a magnetic field according to claim 4, characterized in that: The solid content of the lithium carbonate slurry in the lithium carbonate slurry storage tank is between 15% and 45%.

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