Process and equipment for producing graphite dust

A graphite powder and equipment technology, applied in sustainable manufacturing/processing, electrical components, battery electrodes, etc., can solve the problems of low powder processing efficiency, poor consistency of finished products, and affecting product quality, so as to improve heat treatment efficiency, Low cost and good product consistency

Active Publication Date: 2008-12-10
BTR NEW MATERIAL GRP CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] Graphite powder, graphite powder for diamond, and pure graphite powder for lithium-ion batteries have high requirements on the purity of the material. The existing production process is complicated during the graphitization process, and it is easy to mix in the production process. Impurities affect product quality, and the powder processing efficiency is low, the preparation cost is high, and the consistency of the finished product is poor

Method used

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  • Process and equipment for producing graphite dust
  • Process and equipment for producing graphite dust
  • Process and equipment for producing graphite dust

Examples

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preparation example Construction

[0022] The preparation method of the graphite powder of the present invention comprises the following steps: 1. The carbon content mass ratio is 85-99.95%, and the tap density Tap value is 0.4-1.2g / cm 3 , the particle size is 0.5-50μm, and the specific surface area SSA is 1.0-12.0m 2 / g, the distance d between the ink sheet 002 0.3354~0.3470nm, Fe content 50~4000ppm, magnetic substances Co, Ni and their alloys, alloys of Co, Ni and Fe, iron oxide 1~300ppm, natural graphite powder with a pH value of 5.5~7.5, artificial Graphite powder, needle coke powder, petroleum coke powder, high-temperature pitch or mesophase carbon microspheres are vacuum transported into the graphite crucible, and then the graphite crucible is sealed with a graphitizable binder; The graphite crucible is put into the graphitization furnace. The graphitization furnace is an Aiqisun graphitization furnace (AQX-3300 type of Taiyuan Zhongjin Carbon Co., Ltd.), an in-line graphitization furnace or a continuous...

Embodiment 1

[0026] Example 1, the natural graphite powder is packed into a graphite crucible through a vacuum conveying system. The graphite crucible is a graphite material structure, and one end is provided with a sealable end cap, and the other end is closed. There are 9 graphite crucible cross-sections arranged in a honeycomb shape The diameter of the hole is 200mm, the depth of the hole is 300mm, and the wall thickness between the holes is 20mm. And sealed with graphitizable pitch, the purity of natural graphite powder before treatment is: fixed carbon content 99%, tap density Tap value 0.95g / cm 3 , average particle size 10μm, specific surface area SSA: 4.5m 2 / g,d 002: 0.3358nm, Fe content: 1000ppm, magnetic substances Ni, Cr and Zn: 200ppm, pH value: 6.5. Graphitization heat treatment is carried out in an internal series graphitization furnace, with a heating rate of 1.3°C / min, the heat treatment temperature is 2800°C, the flow rate of nitrogen gas is 80 ml / min during the graphiti...

Embodiment 2

[0027] Example 2, the natural graphite powder is packed into a graphite crucible through a vacuum conveying system. The graphite crucible is a graphite material structure, and one end is provided with a sealable end cap, and the other end is closed. There are 20 cross-sections of the graphite crucible arranged in a honeycomb shape. The square hole, the side length of the hole is 100mm, the hole depth is 200mm, and the wall thickness between the holes is 20mm. And sealed with graphitizable pitch, the purity of graphite powder before treatment is: fixed carbon content 98%, tap density Tap value 0.9g / ml, average particle size 50μm, specific surface area SSA: 1.0m 2 / g;d 002 : 0.3356nm, Fe content: 50ppm, magnetic substance Ni, Cr and Zn: 100ppm, pH value: 6.5. The Acheson graphitization furnace is used for graphitization heat treatment. During the graphitization process, the flow rate of nitrogen gas is 500 ml / min, the heating rate is 10°C / min, and the heat treatment temperature...

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Abstract

The invention discloses a method for preparing graphite powder and the equipment thereof and aims at solving the technical problems of improving the purity of graphite powder and reducing cost. The method of the invention comprises the following steps: the raw micro powder is delivered to a graphite crucible under vacuum state and put into a graphitizing furnace; and a graphite powder product is obtained after heat treatment and cooling. The preparation equipment of graphite powder is composed of a vacuum delivery device, a graphitizing furnace and a vacuum discharging device sequentially connected; the graphitizing furnace is equipped with a graphite crucible and connected with a gas filling system. Compared with the prior art, the method and the equipment of the invention are characterized in that the raw micro power is put into the graphite crucible after vacuum delivery, thus the entry of impurities is reduced in the treatment process, the product purity is greatly improved after heat treatment, graphitization is even, the consistency of the product is good, the graphitization and heat treatment efficiency of the powder material is improved, the technique is simple and the cost is low.

Description

technical field [0001] The invention relates to a preparation method and equipment of graphite powder, in particular to a preparation method and equipment of lithium ion battery negative electrode material, graphite powder for diamond, and nuclear pure graphite powder. Background technique [0002] Graphite powder, graphite powder for diamond, and pure graphite powder for lithium-ion batteries have high requirements on the purity of the material. The existing production process is complicated during the graphitization process, and it is easy to mix in the production process. Impurities affect product quality, and the powder processing efficiency is low, the preparation cost is high, and the consistency of the finished product is poor. Contents of the invention [0003] The purpose of the present invention is to provide a preparation method and equipment of graphite powder. The technical problem to be solved is to improve the purity of graphite powder and reduce the cost. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M4/38
CPCY02E60/10Y02P20/10
Inventor 岳敏贺雪琴张万红
Owner BTR NEW MATERIAL GRP CO LTD
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