Hard carbon screening method based on washing mode

Abstract

The invention discloses a hard carbon screening method based on a water washing mode, which comprises the following steps: finely crushing a carbon material to be treated to obtain carbon powder particles with the D50 particle size of less than 15 microns, putting the carbon powder particles into a screening net frame, putting the whole screening net frame into an ultrasonic machine, adding deionized water into the ultrasonic machine, keeping an ultrasonic working state, and carrying out ultrasonic treatment on the carbon powder particles to obtain carbon powder particles with the D50 particle size of less than 15 microns; and screening the carbon powder smaller than the aperture of the mesh screen out of meshes of the mesh screen, collecting a carbon powder suspension in the ultrasonic machine, standing, removing a supernatant solution, and drying to finally obtain the carbon powder material. Compared with a traditional method in which a screen filtering and screening mode is adopted in a dry environment, and due to generation of static electricity, friction and other reasons, net blocking and low efficiency are prone to occurring in the carbon powder material screening process, the method is carried out in a washing mode, meanwhile, ultrasonic-assisted screening is carried out, carbon powder can be screened out more easily in a deionized water environment, and the screening efficiency is improved. The efficiency is improved, and the screening cost is reduced.

Description

Technical Field

[0001] The invention relates to a hard carbon screening method based on a water washing method. Background Art

[0002] Traditional carbon powder screening is generally completed in a dry environment by using mechanical vibration. Due to the generation of static electricity and friction, the carbon powder material screening process is prone to blockage, resulting in low efficiency. Summary of the invention

[0003] The present invention is to solve the problems existing in the above-mentioned prior art and provide a hard carbon screening method based on water washing. The present invention uses a wet water washing method to screen carbon powder, which is highly efficient and low in cost, and is expected to be widely used in the production of sodium ion electromagnetic negative electrode hard carbon materials.

[0004] The technical solutions adopted in the present invention are: A hard carbon screening method based on water washing, which comprises the following steps: fully crushing the carbon material to be processed to obtain carbon powder particles with a particle size D50 less than 15 microns, and then placing the carbon powder particles in a screening frame, and placing the screening frame as a whole in an ultrasonic machine, adding deionized water to the ultrasonic machine, and maintaining the ultrasonic working state so that carbon powder smaller than the mesh aperture is screened out from the mesh aperture, collecting the carbon powder suspension in the ultrasonic machine, removing the supernatant solution after standing, and drying, to finally obtain the carbon powder material.

[0005] Furthermore, the carbon material to be processed may be a pre-carbonized carbon material, or a carbon material carbonized at a high temperature above 1000 degrees Celsius.

[0006] Furthermore, the treated carbon material is fully crushed, and the crushing method can be blade-type mechanical crushing or ball milling crushing.

[0007] Furthermore, the screening mesh number of the screening frame is more than 600 meshes. After the whole screen is placed in the ultrasonic machine, deionized water is added to the middle of the frame in the ultrasonic machine, and the power of the ultrasonic machine is more than 50 watts.

[0008] Furthermore, after the carbon powder suspension is left to stand for 1-2 days, the supernatant solution is removed and the carbon powder suspension is dried at a temperature of 60° C.-140° C.

[0009] Furthermore, the carbon powder in the sieve that has not been screened to the ultrasonic machine is dried at a temperature of 60° C.-140° C., and is crushed again. The process is repeated to finally obtain all the carbon powder that meets the conditions.

[0010] The present invention has the following beneficial effects: Compared with the traditional method, which uses a screen filtering and screening method in a dry environment, due to the generation of static electricity and friction, the carbon powder material screening process is prone to clogging and low efficiency. The present invention adopts a water washing method and is accompanied by ultrasonic assisted screening. The carbon powder is easier to screen out in a deionized water environment, thereby improving efficiency and reducing screening costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is hard carbon after screening based on water washing, and the mesh number of the screen is 800 meshes. DETAILED DESCRIPTION

[0012] The present invention will be further described below in conjunction with the accompanying drawings.

[0013] like Figure 1 As shown, the present invention is a hard carbon screening method based on a water washing method, in which the carbon material to be processed is finely crushed to obtain carbon powder particles with a particle size D50 less than 15 microns, and then the carbon powder particles are placed in a screening frame, and the screening frame is placed as a whole in an ultrasonic machine, deionized water is added to the ultrasonic machine, and the ultrasonic working state is maintained, so that the carbon powder smaller than the mesh aperture is screened out from the mesh aperture, and the carbon powder suspension in the ultrasonic machine is collected, and the supernatant solution is removed after standing and dried to finally obtain the carbon powder material.

[0014] The carbon material to be processed in the present invention can be a biomass-based pre-carbonized carbon block or carbon particle, or a carbon material that has been carbonized at a high temperature of more than 1000 degrees Celsius.

[0015] The carbon material to be processed is finely crushed. The crushing method can be blade mechanical crushing, ball mill crushing, or air flow mill crushing. The particle size of some carbon particles in the crushed powder must be less than 15 microns.

[0016] The crushed carbon powder is placed in a screening frame with a screening mesh size of more than 600 meshes. The entire screen is placed in an ultrasonic machine. Deionized water is added to the middle of the screen frame in the ultrasonic machine. The ultrasonic working state is maintained with an ultrasonic power of more than 50 watts, so that carbon powder smaller than the screen aperture is screened out from the screen aperture.

[0017] The carbon powder suspension in the ultrasonic machine is collected, and after standing for 1-2 days, the supernatant solution is removed and dried at a drying temperature of 60°C-140°C, so that the carbon powder material screened by water washing can be obtained.

[0018] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A hard carbon screening method based on water washing, characterized in that: The carbon material to be processed is fully crushed to obtain carbon powder particles with a particle size D50 less than 15 microns, and then the carbon powder particles are placed in a screening frame, and the screening frame is placed as a whole in an ultrasonic machine. Deionized water is added to the ultrasonic machine, and the ultrasonic working state is maintained so that the carbon powder smaller than the mesh aperture is screened out from the mesh aperture, and the carbon powder suspension in the ultrasonic machine is collected, and the supernatant solution is removed after standing and dried to finally obtain the carbon powder material.

2. The hard carbon screening method based on water washing as claimed in claim 1, characterized in that: The carbon material to be processed may be a pre-carbonized carbon material, or a carbon material carbonized at a high temperature above 1000 degrees Celsius.

3. The hard carbon screening method based on water washing as claimed in claim 1, characterized in that: The screening mesh number of the screening frame is more than 600 meshes. After the whole screen is placed in the ultrasonic machine, deionized water is added to the middle of the frame in the ultrasonic machine, and the ultrasonic power is more than 50 watts.

4. The hard carbon screening method based on water washing as claimed in claim 1, characterized in that: After the carbon powder suspension is left to stand for 1-2 days, the supernatant solution is removed and the carbon powder suspension is dried at a temperature of 60°C-140°C.

5. The hard carbon screening method based on water washing as claimed in claim 1, characterized in that: The carbon powder in the sieve that is not screened into the ultrasonic machine is dried at a temperature of 60°C-140°C, crushed again, and the process is repeated to finally obtain all the carbon powder that meets the conditions.

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