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Method for preparing high-purity flake graphite

A flake graphite, high-purity technology, applied in the field of purifying flake graphite, can solve problems such as difficulties, and achieve the effects of simple equipment, solving production and preparation problems, and low cost

Inactive Publication Date: 2016-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the purity needs to be further improved, it is still relatively difficult

Method used

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  • Method for preparing high-purity flake graphite
  • Method for preparing high-purity flake graphite
  • Method for preparing high-purity flake graphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put the flake graphite powder and dilute hydrochloric acid into the reaction kettle, heat to 50-60°C, stir and impregnate for 2-3 hours at the same time. Use a centrifuge to separate the solid from the liquid, wash the filter cake with water until it is neutral, and dry it. Put the crude product together with sodium hydroxide solution into the reaction kettle, heat to 50-60°C, stir and impregnate for 2-3 hours at the same time. Use a centrifuge to separate the solid from the liquid, wash the filter cake with water until it is neutral, and dry it. Mix the crude product with the sodium chloride aqueous solution at a ratio of 99:1, put it into a heat treatment reactor, the heating rate is 5°C / min, nitrogen is used as the protective gas, the system is heated to 1000°C, and kept for 1-3h, the sample Cool down to room temperature with the furnace and take it out; put the sample treated in the previous step into a continuous horizontal high-temperature graphitization furnace ...

Embodiment 2

[0024] Put the flake graphite powder and dilute hydrochloric acid into the reaction kettle, heat to 50-60°C, stir and impregnate for 2-3 hours at the same time. Use a centrifuge to separate the solid from the liquid, wash the filter cake with water until it is neutral, and dry it. Put the crude product together with sodium hydroxide solution into the reaction kettle, heat to 50-60°C, stir and impregnate for 2-3 hours at the same time. Use a centrifuge to separate the solid from the liquid, wash the filter cake with water until it is neutral, and dry it. Mix the crude product with the sodium chloride aqueous solution according to the ratio of 97:3, put it into the heat treatment reaction furnace, the heating rate is 5°C / min, nitrogen is used as the protective gas, the system is heated up to 1000°C, and kept for 1-3h, the sample Cool down to room temperature with the furnace and take it out; put the sample treated in the previous step into a continuous horizontal high-temperatu...

Embodiment 3

[0026] Add flake graphite powder and dilute hydrochloric acid into the reaction kettle, heat to 50-60°C, stir and impregnate for 2-3 hours at the same time. Use a centrifuge to separate the solid from the liquid, wash the filter cake with water until it is neutral, and dry it. Put the crude product together with sodium hydroxide solution into the reaction kettle, heat to 50-60°C, stir and impregnate for 2-3 hours at the same time. Use a centrifuge to separate the solid from the liquid, wash the filter cake with water until it is neutral, and dry it. Mix the crude product with the sodium chloride aqueous solution at a ratio of 95:5, put it into a heat treatment reaction furnace, the heating rate is 5°C / min, nitrogen is used as the protective gas, the system is heated to 1000°C, and kept for 1-3h, the sample Cool down to room temperature with the furnace and take it out; put the sample treated in the previous step into a continuous horizontal high-temperature graphitization fur...

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Abstract

The invention discloses a method for purifying high-purity flake graphite. The method comprises the steps of adopting graphite powder with the carbon content being greater than 90% as raw material powder, adding the graphite powder into a reaction kettle together with diluted hydrochloric acid, conducting heating and stirring, conducting dipping for 2-3 hours, then adding the mixture into the reaction kettle together with a sodium hydroxide solution with the mass ratio being 1: (2.8-3), conducting heating, and meanwhile conducting stirring for a dipping reaction; then mixing a second crude product with sodium chloride according to the mass ratio of 100: (1-5), then conducting drying, transferring the materials into a graphite crucible, under the protection of micro-positive pressure nitrogen, raising the temperature to 1000-1200 DEG C, preserving the temperature for 1-3 hours, naturally cooling the materials to the room temperature, then raising the temperature to 2200-2600 DEG C, and preserving the temperature for 6-10 minutes, so that the high-purity flake graphite is finally obtained. By means of the purification process, flake graphite with the carbon content being 90% can be purified to the extent of approximate 99.9933-99.9955%, the technical content of the flake graphite is greatly raised, and the application scope of the flake graphite is greatly widened.

Description

technical field [0001] The invention relates to a method for purifying flake graphite. technical background [0002] The carbon content of natural flake (crystalline) graphite is 70%-90%, up to 99.9%. Because of its scaly shape, it is called flake graphite. Flake graphite has a higher carbon content, less ash content, electrical conductivity, thermal conductivity, and oxidation resistance than cryptocrystalline (earthy) graphite. It has a wide range of applications, and is currently the most common negative electrode material for lithium batteries. Therefore, the prospect of developing and purifying flake graphite is very broad. The environmentally friendly and energy-saving flake graphite purification technology will greatly improve the deep processing technology level of my country's graphite industry, make the basic research and development capabilities and production technology of my country's flake graphite industry approach or reach the international advanced level, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 苏哲安薛亮刘艳杨凯黄启忠
Owner CENT SOUTH UNIV
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