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Spherical graphite production process

A spherical graphite and production process technology, applied in the field of spherical graphite production process, can solve the problems of irregular shape of spherical graphite, low purity of spherical graphite, complex production process, etc., and achieve long spheroidization time, good spheroidization effect, and guaranteed The effect of purity

Active Publication Date: 2016-07-20
青岛昕昊阳新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing production process of spherical graphite is too complicated, the purity of the produced spherical graphite is low, and the shape of spherical graphite is irregular, and the tap density is low, which is a major problem in the entire spherical graphite production industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A production process of spherical graphite, comprising the following steps:

[0021] (1) Raw material pretreatment: put the graphite raw material into a sieve for preliminary screening, and the screened and fallen graphite raw material enters the permanent magnet iron remover to remove iron and other magnetic substances in the graphite raw material;

[0022] (2) Pulverization and spheroidization: the pretreated graphite enters the pulverizer for pulverization and spheroidization. The current of the main machine of the pulverizer is not more than 50A. In order to improve the efficiency and ensure the shape and yield of spherical graphite, the pulverizer in the step (2) It is set to 3 sets, the crushing cycle is 15 minutes / time, the crushing cycle is 2-4 times, and the crushing cycle is completed once for sampling inspection, the speed of the crushing machine is 2000 rpm, and the current of the induced draft fan is not more than 25A;

[0023] (3) Classification: The crush...

Embodiment 2

[0030] The difference between this embodiment and embodiment 1 is:

[0031] The main current of the pulverizer is 40A, the pulverization cycle is 3 times, the current of the induced draft fan is 20A, and the spherical graphite classified in the step (4) is added to the reaction tank Perform a purification in the middle, add water to the reaction tank Stirring fin part in the middle, then add hydrochloric acid, nitric acid and hydrofluoric acid in turn and stir for 4 minutes, the reaction tank The concentration of the solution in the tank is controlled at 50%. After the stirring time is completed, the stirring fins rotate 4 more times, and the reaction tank is opened. The connected steam valve makes the reaction tank The temperature of the inner solution reaches 90 degrees, open the reaction tank with The connected air duct valve keeps the steam away from the reaction tank The top of the tank is about 40cm, and the steam cannot escape the reaction tank In addition, a...

Embodiment 3

[0033] The differences between this embodiment and embodiment 2 are:

[0034] The main current of the pulverizer is 30A, the pulverization cycle is 2 times, the current of the induced draft fan is 15A, and the spherical graphite classified in the step (4) is added to the reaction tank Perform a purification in the middle, add water to the reaction tank Stirring fin part in the middle, then add hydrochloric acid, nitric acid and hydrofluoric acid in turn and stir for 3 minutes, the reaction tank The concentration of the solution in the tank is controlled at 50%. After the stirring time is completed, the stirring fins rotate 3 more times, and the reaction tank is opened. The connected steam valve makes the reaction tank When the temperature of the inner solution reaches 75 degrees, open the reaction tank with The connected air duct valve keeps the steam away from the reaction tank The top of the tank is about 30cm, and the steam cannot escape from the reaction tank ...

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PUM

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Abstract

The invention discloses a spherical graphite production process.The spherical graphite production process comprises the steps of 1 raw material pretreatment, 2 smashing and balling, 3 grading, 4 primary purification, 5 second purification, 6 drying, 7 magnetic separation and 8 screening and package, wherein three smashing machines are arranged for the step 2.The spherical graphite production process is simple, spherical graphite is high in purity, smaller in surface area and higher in ramming density, and the rate of finished products is high.

Description

technical field [0001] The invention relates to the technical field of spherical graphite processing, in particular to a production process of spherical graphite. Background technique [0002] Spherical graphite is made of high-quality high-carbon natural flake graphite as raw material, and the surface of graphite is modified by advanced processing technology to produce graphite products with different fineness and ellipsoidal shape. Because of its good electrical conductivity and high crystallinity, Low cost, high theoretical lithium intercalation capacity, low and flat charge and discharge potential, etc., are currently an important part of the anode material for lithium-ion batteries, and are a replacement product for anode materials for lithium-ion battery production at home and abroad. The existing production process of spherical graphite is too complicated, and the purity of the produced spherical graphite is low, and the shape of the spherical graphite is irregular, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01P2004/32C01P2004/61
Inventor 孙伟伟付宝鹏
Owner 青岛昕昊阳新能源材料有限公司
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