Metal particle removing device

Abstract

The utility model relates to the technical field of iron phosphate production, and particularly discloses a metal particle removing device. The device structurally comprises a rack shell, a filtering tank body internally provided with an adsorption magnet, and a slurry inlet pipe and a slurry outlet pipe which are communicated with the interior of the filtering tank body, and is characterized in that the slurry inlet pipe is communicated with a feeding port pipe and a slag discharge port pipe, and the slurry outlet pipe is communicated with a discharging port pipe and a flushing water port pipe; the feeding port pipe, the slag discharging port pipe, the discharging port pipe and the flushing water port pipe are each provided with an electromagnetic valve, the electromagnetic valves are electrically connected with a PLC, and the technical problems that in the prior art, an iron remover needs to be detached for cleaning, cleaning is tedious, and efficiency is low are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of iron phosphate production, in particular to a metal particle removing device. Background Art

[0002] Iron phosphate (FePO4) is one of the important raw materials for producing lithium iron phosphate (LiFePO4, abbreviated as LFP). As a cathode material, lithium iron phosphate has the advantages of excellent thermal stability, good cycle life, electrochemical stability, environmental friendliness, etc., and has become one of the most ideal cathode materials in the field of power batteries. However, when metal impurities are introduced into the lithium iron phosphate material, it will cause serious damage to the life and safety of the battery. Such as: iron, nickel, copper, zinc, chromium, etc. Metal impurities are oxidized and reduced in the battery to produce metal elements. When the metal elements at the negative electrode accumulate to a certain extent, dendrites will be formed, resulting in diaphragm perforation, causing internal short circuit of the battery, increasing the self-discharge rate of the battery, and even causing the battery to catch fire and explode in severe cases, affecting the safety performance of the battery.

[0003] Metal impurities cannot be introduced into lithium iron phosphate. Therefore, iron phosphate, as an important raw material for lithium iron phosphate production, should also not contain metal impurities. However, in the iron phosphate production process, equipment wear, reaction reduction, and raw material carrying may all introduce metal impurities, resulting in excessive metal particles in the product iron phosphate. To solve this problem, in the traditional process, most of the metal particles in the iron phosphate production process are ferromagnetic metal particles and can be attracted by magnets. Usually, multiple permanent magnetic separators are installed in the subsequent process sections for interception. However, after installing the permanent magnetic separators, it is found that there are still cases where the product contains metal particles.

[0004] Through analysis, after most magnetic separators reach the adsorption extreme value, metal particles can pass through the magnetic separator and be mixed with the iron phosphate slurry. Therefore, the metal particles in the product usually mix into the product before the machine is shut down for cleaning. At this time, the magnetic separator needs to be disassembled to remove the magnetic rod for cleaning, and then put back into production after cleaning. This cleaning method requires frequent shutdown and disassembly of the magnetic separator, with cumbersome cleaning, low efficiency, and the production line runs intermittently during cleaning, resulting in low production efficiency. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a metal particle removing device to solve the technical problems of the existing technology that the magnetic separator needs to be disassembled for cleaning, with cumbersome cleaning and low efficiency.

[0006] To solve the above problems, the technical solution adopted by the present utility model is as follows: A metal particle removal device includes a metal particle interception device. The metal particle interception device includes a frame housing. A filter tank body with an adsorption magnet inside is installed on the frame housing. A slurry inlet pipe and a slurry outlet pipe that are connected to the inside of the filter tank body. The slurry inlet pipe is connected to a feed port pipe and a slag discharge port pipe. The slurry outlet pipe is connected to a discharge port pipe and a flushing water port pipe. Solenoid valves are provided on the feed port pipe, the slag discharge port pipe, the discharge port pipe, and the flushing water port pipe. The solenoid valves are all electrically connected to a PLC controller.

[0007] The beneficial effects of this implementation are as follows:

[0008] 1. In the prior art, after the iron remover reaches the adsorption extreme value, metal particles can pass through the iron remover and be mixed with the iron phosphate slurry. At this time, the iron remover needs to be disassembled to take out the magnetic rod for cleaning, and then put back into production after cleaning. This cleaning method requires frequent shutdown and disassembly of the iron remover, resulting in intermittent operation of the production line and low production efficiency. In this application, a flushing water port pipe and a slag discharge pipe are provided, and solenoid valves and a PLC controller are provided on the pipes. The PLC controller is used to regularly control the opening and closing of the solenoid valves. When the magnet reaches the adsorption extreme value, the solenoid valves of the iron phosphate slurry feed port pipe and the discharge port pipe are closed, and the solenoid valves of the flushing water port pipe and the slag discharge port pipe are opened to flush the magnet with flushing water, avoiding disassembly of the iron remover, simple cleaning of the filter, and high cleaning efficiency.

[0009] Further, the slurry inlet pipe is also connected to a slurry return port pipe. A solenoid valve is also provided on the slurry return pipe, and the solenoid valve is also electrically connected to the PLC controller.

[0010] Further, the adsorption magnet is an electromagnet, and the power switch of the adsorption magnet is also electrically connected to the PLC controller.

[0011] Further, a controller box is welded on the frame housing, and the PLC controller is installed in the controller box. This avoids corrosion and dust accumulation of the controller.

[0012] Further, the inner diameter of the filter tank body at the installation position of the adsorption magnet becomes smaller.

[0013] Further, a grid-type filter screen is provided in the filter tank body at the installation position of the adsorption magnet. The grid-type filter screen cuts the iron phosphate slurry, exposing the metal particles wrapped in the slurry, making them easier to be adsorbed.

[0014] Further, two metal particle interception devices are provided, and the two metal particle interception devices are connected in parallel. Description of the Drawings

[0015] Figure 1This is the process flow diagram actually used in the embodiment of the present utility model.

[0016] Figure 2 This is the front view of the embodiment of the present utility model.

[0017] Figure 3 This is the left view of the embodiment of the present utility model.

[0018] Figure 4 This is the structural schematic diagram of the adsorption magnet in the filter tank body of the embodiment of the present utility model. Specific embodiments

[0019] The following is a further detailed description through specific embodiments:

[0020] The reference numerals in the accompanying drawings of the specification include: frame housing 1, filter tank body 2, slurry inlet pipe 21, slurry outlet pipe 22, inlet slurry tee 3, feed port pipe 31, slurry return port pipe 32, slag discharge port pipe 33, outlet slurry tee 4, flushing water inlet pipe 41, discharge port pipe 42, pressure relief port pipe 43, solenoid valve 5, condensate water pipe 6, controller box 7, adsorption magnet 8.

[0021] The embodiment is as shown in the attached Figures 1 to 4 A metal particle removing device includes two metal particle intercepting devices with exactly the same structure. The two metal particle intercepting devices are connected in parallel, and a solenoid valve is installed on the pipeline to control the slurry to enter one of the metal particle intercepting devices by the opening and closing of the solenoid valve.

[0022] The metal particle intercepting device includes a frame housing 1. The frame housing 1 is a rigid frame welded by angle steel, and a filter tank body 2 is installed in the middle of the frame. The main purpose of the frame housing 1 is to separate the filter tank body 2 from the ground and support the filter tank body 2.

[0023] The filter tank body 2 is vertically installed in the middle of the frame housing 1 and fixed to the frame housing 1 by bolts. A slurry inlet pipe 21 is arranged at the lower end of the filter tank body 2, and a slurry outlet pipe 22 is arranged at the upper end. Both the slurry inlet pipe 21 and the slurry outlet pipe 22 are connected to the inside of the filter tank body 2. Therefore, when the iron phosphate slurry flows through the filter tank body 2, it flows from the lower end to the upper end, and its metal particles are intercepted by the adsorption magnet 8 inside the filter tank body 2. Moreover, the density of the metal particles is greater than that of the slurry, and the resistance to upward flow in the vertical tank body is large. Therefore, it is easier to be retained in the filter tank body 2.

[0024] The slurry inlet pipe 21 is connected to a slurry inlet tee 3, and the slurry outlet pipe 22 is connected to a slurry outlet tee 4. The slurry inlet tee 3 is connected to a feed port pipe 31, a slag discharge port pipe 33, and a slurry return port pipe 32. The slurry outlet tee 4 is connected to a discharge port pipe 42, a flushing water inlet pipe 41, and a pressure relief port pipe 43. Solenoid valves 5 are provided on the feed port pipe 31, the slag discharge port pipe 33, the slurry return port pipe 32, the discharge port pipe 42, the flushing water inlet pipe 41, and the pressure relief port pipe 43, and the solenoid valves 5 are electrically connected to a PLC controller installed in the controller housing 7.

[0025] An adsorption magnet 8 is provided in the filter tank body 2. The installation position of the adsorption magnet 8 makes the inner diameter of the filter tank body 2 smaller. A grid-shaped filter screen is provided in the filter tank body 2 at the installation position of the adsorption magnet 8. The adsorption magnet 8 is an electromagnet, so the magnetism of the adsorption magnet 8 can be controlled by a power supply. The power switch of the adsorption magnet 8 is a magnetic switch, and the magnetic switch is also electrically connected to the PLC controller and is controlled by the PLC controller. A condensate water pipe 6 is provided on the frame housing 1, and the filter housing 2 can be cooled through the condensate water pipe 6 to prevent the electromagnet from overheating.

[0026] During use, the PLC controller can be used to control the opening and closing of the solenoid valves 5 on each pipeline to control the connection status of each pipe, and can also control whether the power supply of the adsorption magnet 8 is connected.

[0027] The metal particle interception device works in three stages. First, the filtration stage. When filtering the iron phosphate slurry, the solenoid valves 5 of the feed port pipe 31 and the discharge port pipe 42 are opened, and the other solenoid valves 5 are closed. At this time, the iron phosphate slurry enters from the slurry inlet pipe 2, passes through the filter tank body 2, the metal particles in the slurry are intercepted, and the clean slurry comes out from the discharge port pipe 42, completing the removal of metal particles from the iron phosphate slurry.

[0028] Second, the reflux stage. When the adsorption magnet 8 in the filter tank body 2 adsorbs metal particles to 80% of the adsorption limit, the solenoid valve 5 of the slurry return port pipe 32 is opened, and the solenoid valves 5 of the other pipe bodies are closed. At this time, the slurry in the filter tank body 2 flows out of the filter tank body to empty the filter tank body 2.

[0029] Third, the cleaning stage. When the filter tank body 2 is emptied, the power supply of the adsorption magnet 8 is cut off so that the adsorption magnet 8 does not have magnetism, and the solenoid valves 5 of the flushing water inlet pipe 41 and the slag discharge port pipe 33 are opened, and the solenoid valves 5 of the other pipelines are kept closed. The backflush water flows in from the flushing water inlet pipe 41 to wash down the metal particles in the filter tank body 2 and discharge them through the slag discharge port pipe 33. Since the filter tank body 2 is vertically arranged, when the adsorption magnet 8 is powered off, the metal particles will fall downward under the action of their own weight, and with the cleaning of the flushing water, the cleaning of the filter tank body 2 is completed. Compared with a horizontally arranged filter tank body 2, its cleaning is cleaner.

[0030] Since two metal particle interception devices are provided in this embodiment, when the adsorption magnet 8 of one metal particle interception device adsorbs metal particles to 80% of the adsorption extreme value, the judgment of 80% of the adsorption extreme value usually utilizes the experience of engineers and sets a filtering time for judgment. The PLC controller closes the slurry inlet pipeline of this device and starts the reflux stage work. At this time, the other metal particle interception device starts the filtering stage work. The two devices alternate to ensure that production is not interrupted.

[0031] The above are only embodiments of the present invention. Common knowledge such as specific structures and characteristics known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A metal particle removal device, comprising a metal particle interception device, the metal particle interception device including a frame housing, a filter tank body with an adsorption magnet arranged inside is installed on the frame housing, a slurry inlet pipe and a slurry outlet pipe that are connected to the inside of the filter tank body, and is characterized in that: The slurry inlet pipe is connected to a feed port pipe and a slag discharge port pipe. The slurry outlet pipe is connected to a discharge port pipe and a flushing water port pipe. Solenoid valves are provided on the feed port pipe, the slag discharge port pipe, the discharge port pipe, and the flushing water port pipe, and the solenoid valves are all electrically connected to a PLC controller.

2. The metal particle removing device according to claim 1, wherein: The slurry inlet pipe is further connected to a slurry reflux port pipe. A solenoid valve is also provided on the slurry reflux pipe, and the solenoid valve is also electrically connected to the PLC controller.

3. The metal particle removal device according to claim 1, characterized in that: The adsorption magnet is an electromagnet, and the power switch of the adsorption magnet is also electrically connected to the PLC controller.

4. The metal particle removing device according to claim 1, characterized in that: A controller box is welded on the frame housing, and the PLC controller is installed in the controller box.

5. The metal particle removal device according to claim 2, characterized in that: The inner diameter of the filter tank at the installation position of the adsorption magnet becomes smaller.

6. The metal particle removal device according to claim 5, characterized in that: A grid-type filter screen is provided in the filter tank at the installation position of the adsorption magnet.

7. The metal particle removing device according to claim 1, wherein: Two metal particle interception devices are provided, and the two metal particle interception devices are connected in parallel.

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