Separation and purification method of metal material carbon coating

Abstract

The invention relates to the technical field of separation and purification of metal material carbon coatings, in particular to a separation and purification method of a metal material carbon coating, which comprises the following steps: S1, adding a certain proportion of zirconium balls into a metal carbon coating material, feeding into a ball mill, carrying out ball milling and crushing, unloading, and carrying out vibration screening to obtain a metal and carbon mixed powder material; s2, the metal and carbon mixed powder material is transferred into an oscillator, ultrapure water is added, oscillation separation is conducted, and a metal and carbon mixed powder material solution is obtained; s3, transferring the solution into an ultrasonic vibrating screen for wet screening, wherein an oversize product is a metal material particle wet material; the undersize product is a carbon material solution, and carrying out filter pressing to obtain a carbon material wet filter cake; and S4, transferring the filter cake into drying equipment, and drying to obtain the purified carbon material. In the preparation process, oscillation and ultrasound are added for assistance, and the separated and purified carbon material is high in purity, few in metal impurities and uniform in particle size distribution. The method is high in process additional value and suitable for industrialization.

Description

Technical Field

[0001] The invention relates to the technical field of separation and purification of carbon coatings of metal materials, and in particular to a method for separation and purification of carbon coatings of metal materials. Background Art

[0002] Metallic carbon coating materials are often used in lithium batteries to increase conductivity, and they account for a certain mass proportion in the battery. In the process of battery manufacturing or battery recycling, the carbon coating on the metal surface still has corresponding properties, so its separation has certain economic and social value.

[0003] Chinese utility model patent 202223051655.0 discloses a device for removing the conductive coating of electrode foil, including a conveyor for transmitting and carrying the electrode foil, a high-speed solid medium ejector for ejecting solid medium at high speed and with the ejection direction toward the conveying surface of the conveyor, and a screening device connected to the unloading end of the conveyor and used to separate the electrode foil from which the surface coating has been removed. The purpose of the utility model is to overcome the deficiency that the existing electrode foil cannot be completely separated and recycled. The utility model can effectively remove the conductive coating on the surface of the electrode foil to obtain a complete electrode foil.

[0004] The present invention discloses a method for separating and purifying a carbon coating of a metal material, which belongs to the field of lithium battery materials. The preparation method comprises the following steps. First, zirconium balls are added to the metal carbon coating material, and the material is crushed by ball milling and then sieved. The metal and carbon mixed powder material under the sieve is added with water and separated by oscillation. Then, the material is wet-sieved by an ultrasonic vibrating screen. The carbon material solution under the sieve is filtered to obtain a filter cake, and then the purified carbon material is obtained after drying. Oscillation and ultrasound are added as auxiliary in the preparation process of the present invention, and the separated and purified carbon material has high purity, few metal impurities, and uniform particle size distribution. The process of the present invention has high added value and is suitable for industrialization. Summary of the invention

[0005] The purpose of the present invention is to provide a method for separating and purifying a carbon coating of a metal material. In the preparation process of the present invention, oscillation and ultrasound are added as auxiliary, and the separated and purified carbon material has high purity, few metal impurities, and uniform particle size distribution. The process of the present invention has high added value and is suitable for industrialization.

[0006] To achieve the above object, the present invention provides a method for separating and purifying a carbon coating of a metal material, comprising the following steps:

[0007] S1, adding a certain proportion of zirconium balls to the metal carbon coating material, feeding the material into a ball mill for ball milling, and vibrating and screening after unloading to obtain a metal and carbon mixed powder material;

[0008] S2, transferring the metal and carbon mixed powder material into an oscillator, adding ultrapure water and oscillating and separating to obtain a metal and carbon mixed powder material solution;

[0009] S3, transferring the above solution to an ultrasonic vibration screen for wet screening, the material on the screen is a wet material of metal material particles; the material under the screen is a carbon material solution, and a carbon material wet filter cake is obtained after filter pressing;

[0010] S4, transferring the filter cake to a drying device, and obtaining a purified carbon material after drying.

[0011] Preferably, the metal carbon coating material, the metal is one or more of Cu, Cu composite polymer material, Al, Al composite polymer material, diaphragm, polymer material, and the carbon coating is one or more of carbon materials such as graphite, carbon nanotubes, carbon fiber, carbon black, carbon balls, activated carbon, graphene, etc.

[0012] Preferably, in step S1, the addition ratio of the metal carbon coating material to the zirconium balls is 1:0.1 to 1:2.

[0013] Preferably, in step S2, the mass ratio of the metal carbon coating material to ultrapure water is 1:1 to 1:5.

[0014] Preferably, in step S3, the ultrasonic separation frequency is 20kHz to 80kHz.

[0015] Preferably, in step S4, the drying temperature of the carbon coating material is 80-400°C.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In this preparation method, oscillation and ultrasound are used as auxiliary means, and the separated and purified carbon material has high purity, few metal impurities, and uniform particle size distribution.

[0018] 2. In this preparation method, the process has high added value and is suitable for industrialization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a flow chart of a method for separating and purifying a carbon coating of a metal material. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] This embodiment provides a method for separating and purifying a carbon coating of a metal material, comprising the following steps:

[0022] S1, adding a certain proportion of zirconium balls to the metal carbon coating material, feeding the material into a ball mill for ball milling, and vibrating and screening after unloading to obtain a metal and carbon mixed powder material;

[0023] S2, transferring the metal and carbon mixed powder material into an oscillator, adding ultrapure water and oscillating and separating to obtain a metal and carbon mixed powder material solution;

[0024] S3, transferring the above solution to an ultrasonic vibration screen for wet screening, the material on the screen is a wet material of metal material particles; the material under the screen is a carbon material solution, and a carbon material wet filter cake is obtained after filter pressing;

[0025] S4, transferring the filter cake to a drying device, and obtaining a purified carbon material after drying.

[0026] Example 1

[0027] The present invention provides a method for separating and purifying a carbon coating of a metal material, taking the preparation of a carbon coating by coating carbon nanotubes on metal aluminum as an example. Figure 1 As shown, the specific steps include:

[0028] Step 1, weigh 100 kg of aluminum material carbon nanotube coating material and put it into a ball mill, add 60 kg of zirconium balls, and ball mill for 30 minutes;

[0029] Step 2, unloading, screening with a 10-mesh ultrasonic vibration screen, the screened material is zirconium balls;

[0030] Step 3, the metal and carbon nanotube mixed powder material under the sieve is transferred into an oscillator, 140 kg of ultrapure water is added, and the mixture is oscillated at 20 Hz for 20 min to obtain a metal and carbon nanotube mixed powder material solution;

[0031] Step 4, transferring the above solution to a 200-mesh ultrasonic vibration screen for wet screening, and the material on the screen is aluminum particle wet material;

[0032] Step 5, the screened carbon material solution enters the filter press, and after filtering, a carbon nanotube wet cake is obtained;

[0033] Step 6: Transfer the carbon nanotube filter cake into a drying rotary furnace and dry it at 120° C. to obtain a purified carbon material with an aluminum content of 0.2%.

[0034] Example 2

[0035] The present invention provides a method for separating and purifying a carbon coating of a metal material, taking the preparation of a carbon coating by coating carbon nanotubes on metal aluminum as an example. Figure 1 As shown, the specific steps include:

[0036] Step 1, weigh 200 kg of aluminum material carbon nanotube coating material and put it into a ball mill, add 100 kg of zirconium balls, and ball mill for 60 minutes;

[0037] Step 2, unloading, screening with a 100-mesh ultrasonic vibration screen, the screened material is zirconium balls;

[0038] Step 3, the metal and carbon nanotube mixed powder material under the sieve is transferred into an oscillator, 200 kg of ultrapure water is added, and the mixture is oscillated at 50 Hz for 30 min to obtain a metal and carbon nanotube mixed powder material solution;

[0039] Step 4, transferring the above solution to a 500-mesh ultrasonic vibration screen for wet screening, and the material on the screen is aluminum particle wet material;

[0040] Step 5, the screened carbon material solution enters the filter press, and after filtering, a carbon nanotube wet cake is obtained;

[0041] Step 6: Transfer the carbon nanotube filter cake into a drying rotary furnace and dry it at 140° C. to obtain a purified carbon material with an aluminum content of 0.05%.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0043] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for separating and purifying a carbon coating of a metal material, characterized in that: The following steps are involved: S1, adding a certain proportion of zirconium balls to the metal carbon coating material, feeding the material into a ball mill for ball milling, and vibrating and screening after unloading to obtain a metal and carbon mixed powder material; S2, transferring the metal and carbon mixed powder material into an oscillator, adding ultrapure water and oscillating and separating to obtain a metal and carbon mixed powder material solution; S3, transferring the above solution to an ultrasonic vibration screen for wet screening, the material on the screen is a wet material of metal material particles; the material under the screen is a carbon material solution, and a carbon material wet filter cake is obtained after filter pressing; S4, transferring the filter cake to a drying device, and obtaining a purified carbon material after drying.

2. The method for separating and purifying a carbon coating of a metal material according to claim 1, characterized in that: The metal carbon coating material is one or more of Cu, Cu composite polymer materials, Al, Al composite polymer materials, diaphragms, and polymer materials, and the carbon coating is one or more of carbon materials such as graphite, carbon nanotubes, carbon fibers, carbon black, carbon balls, activated carbon, and graphene.

3. The method for preparing Aralia nigra juice according to claim 1, characterized in that: In step S1, the addition ratio of the metal carbon coating material to the zirconium balls is 1:0.1 to 1:

2.

4. The method for separating and purifying a carbon coating of a metal material according to claim 1, characterized in that: In step S2, the mass ratio of the metal carbon coating material to ultrapure water is 1:1 to 1:

5.

5. The method for separating and purifying a carbon coating of a metal material according to claim 1, characterized in that: In step S3, the ultrasonic separation frequency is 20kHz to 80kHz.

6. The method for separating and purifying a carbon coating of a metal material according to claim 1, characterized in that: In step S4, the carbon coating material is dried at a temperature of 80 to 400°C. Characteristically, in step S4, the carbon coating material is dried at a temperature of 80 to 400°C.

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