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Method of preparing graphite microspheres by graphite tailings

A technology of graphite tailings and graphite, which is applied in the field of preparing graphite microspheres by using graphite tailings, can solve the problems of waste of resources, the cost of negative electrode materials cannot be reduced, etc., and achieve resource utilization, excellent cycle stability and safety performance, and simple preparation process Effect

Active Publication Date: 2019-03-19
乌兰察布市大盛石墨新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This has caused a great waste of resources, and it is also one of the main reasons why the cost of negative electrode materials cannot be reduced.

Method used

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  • Method of preparing graphite microspheres by graphite tailings
  • Method of preparing graphite microspheres by graphite tailings
  • Method of preparing graphite microspheres by graphite tailings

Examples

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Effect test

preparation example Construction

[0018] The invention provides a method for preparing graphite microspheres by using graphite tailings. The preparation method comprises the following steps:

[0019] S1, rolling the graphite tailings through a roller compactor to obtain graphite flakes;

[0020] S2, performing airflow grinding on the graphite flakes in the grinding chamber to obtain first graphite particles, wherein during the airflow grinding process, the rotation speed of the rotor is 2000rpm-4000rpm, and the rotation speed of the internal classification wheel is 5rpm-40rpm;

[0021] S3, shaping the first graphite particles by a shaping machine to obtain second graphite particles, wherein in the shaping process, the rotating speed of the rotor is 2500rpm-4500rpm, the rotating speed of the inner classifying wheel is 15rpm-38rpm, and the rotating speed of the outer classifying wheel is 5000rpm ~ 6000rpm; and

[0022] S4, classifying the second graphite particles to obtain graphite microspheres, wherein the r...

Embodiment 1

[0036] The method for preparing graphite microspheres using graphite tailings described in this embodiment may further comprise the steps:

[0037] Take 1000kg of graphite tailings with a carbon content of 93% natural graphite, the average median diameter is 6.5μm, the bulk density is 0.1g / mL, the tap density is 0.18g / mL, and the specific surface area is 23.6m 2 / g. see figure 1 , the natural graphite is irregular granular.

[0038] Add the graphite tailings to a sieve machine with a screen mesh number of 20 mesh to remove impurities larger than 20 mesh.

[0039] Put the graphite tailings from which impurities have been removed in a double-roller granulator, and granulate through double-roll calendering to obtain a sheet thickness of 0.8mm and an average size of 0.5mm. 2 graphite flakes. After sieving through a 45-mesh sieve, the average median diameter is 350 μm, the tap density is 0.34 g / m, the bulk density is 0.29 g / mL, and the specific surface area is 17.9 m 2 / g grap...

Embodiment 2

[0044] The method for preparing graphite microspheres using graphite tailings described in this embodiment may further comprise the steps:

[0045] Provide 1000kg of natural graphite tailings with a carbon content of 95%, with an average median diameter of 5.4μm, a bulk density of 0.14g / mL, a tap density of 0.2g / mL, and a specific surface area of ​​21.4m 2 / g.

[0046] Add the graphite tailings to a sieve machine with a screen mesh number of 20 mesh to remove impurities larger than 20 mesh.

[0047] Put the graphite tailings from which impurities have been removed in a double-roller granulator, and granulate through double-roll calendering to obtain a sheet thickness of 1.1mm and an average size of 0.8mm 2 graphite flakes. Then sieve through a 45-mesh sieve to obtain an average median diameter of 328 μm, a tap density of 0.38 g / mL, a bulk density of 0.21 g / mL, and a specific surface area of ​​16.5 m 2 / g graphite flakes.

[0048] The graphite flakes after this sieving are ...

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Abstract

The invention relates to a method of preparing graphite microspheres by graphite tailings. The method comprises the following steps: 1) grinding the graphite tailings to obtain graphite sheets; 2) grinding the graphite sheets in a grinding room with an air flow to obtain first graphite particles; 3) shaping the first graphite particles through a shaping machine to obtain second graphite particles;and 4) grading the second graphite particles to obtain the graphite microspheres. The graphite microspheres are prepared by the graphite tailings, so that the production cost is lowered greatly and resources are utilized effectively.

Description

technical field [0001] The invention relates to a graphite negative electrode material, in particular to a method for preparing graphite microspheres by using graphite tailings. Background technique [0002] At the end of the 20th century, lithium-ion batteries were favored by people for their small size, easy portability, long cycle life, and environmental protection. Graphite material has a hexagonal crystal layered structure and is used as a negative electrode material for lithium-ion batteries. In particular, natural flake graphite is widely used in lithium-ion battery anode materials due to its wide range of sources and low price. [0003] The current process for preparing graphite anode materials: First, graphite with a carbon content of more than 90% is pulverized many times, and then classified, so that the average particle size of graphite powder changes from 150 microns to 17 microns, and the tap density changes from 0.6 g / mL to 0.95g / mL~1.0g / mL, specific surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/21H01M4/583H01M4/62H01M10/0525
CPCC01B32/21H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 冯向阳时迎迎
Owner 乌兰察布市大盛石墨新材料股份有限公司
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