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A kind of purification method of high carbon graphite

A purification method, graphite technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of unstable graphite purity, cumbersome operation steps, and long time, and achieve low cost, simple operation steps, and time-saving short effect

Active Publication Date: 2021-08-03
HEILONGJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the disadvantage of this method is that a large amount of acid and other reagents are used, the operation steps are cumbersome, the time is long, and for the purification of high carbon graphite (99-94% carbon content), the effect is not ideal
[0006] Based on the above problems, the present invention proposes a method for purifying high-carbon graphite. By adding a complexing agent, it can act as a molecular capsule, protect the eluted metal ions, avoid hydrolysis and adsorption by graphite, and solve the problem of The problem of unstable graphite purity ensures the purification efficiency

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  • A kind of purification method of high carbon graphite
  • A kind of purification method of high carbon graphite

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Embodiment 1

[0035] The purification of embodiment 1 high carbon graphite

[0036]1. Graphite composition to be purified:

[0037] Table 1

[0038] project Purity (C%) Fe(μg / g) Si (μg / g) Al (μg / g) Ni (μg / g) Cu(μg / g) parameter 94 2187.01 566.07 225.46 71.00 22.11

[0039] 2. Method

[0040] Flowchart such as figure 2 shown.

[0041] (1) placing the high-carbon graphite with a carbon content of 94% in the reactor;

[0042] (2) Preparation of purification agent: put purified water, industrial hydrochloric acid, EDTA, triethanolamine, and hydroxylamine hydrochloride in the treatment agent storage tank for mixing, wherein the volume ratio of industrial hydrochloric acid to purified water is 1:10, and the final concentration of EDTA is 3w / w%, the final concentration of triethanolamine is 0.1w / w%, and the final concentration of hydroxylamine hydrochloride is 0.5w / w%;

[0043] (3) Purification: add the purifying agent into the reaction kettle so that th...

Embodiment 2

[0050] The purification of embodiment 2 high carbon graphite

[0051] 1. Graphite components to be purified: see Table 1

[0052] 2. Method

[0053] Flowchart such as figure 2 shown.

[0054] (1) placing the high-carbon graphite with a carbon content of 94% in the reactor;

[0055] (2) Preparation of purification agent: put pure water, phosphoric acid, EDTA, triethanolamine, and hydroxylamine hydrochloride in the treatment agent storage tank for mixing, wherein the volume ratio of phosphoric acid to pure water is 1:20, and the final concentration of EDTA is 3w / w %, the final concentration of triethanolamine is 0.1w / w%, and the final concentration of hydroxylamine hydrochloride is 0.5w / w%;

[0056] (3) Purification: add the purifying agent into the reaction kettle so that the mass ratio of EDTA to graphite is 1:5, introduce steam at 230°C, ultrasonically oscillate to remove bubbles, make the graphite fully contact with the purifying agent, heat to 90°C with microwave and s...

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Abstract

The invention discloses a method for purifying high-carbon graphite. The method comprises: (1) placing high-carbon graphite with a carbon content between 99-94% in a reaction kettle; (2) preparing a purifying agent: Put purified water, industrial hydrochloric acid or phosphoric acid, EDTA, triethanolamine, and hydroxylamine hydrochloride in the treatment agent storage tank for mixing; (3) Purification: add the purification agent into the reaction kettle, pass in steam at 230°C, and ultrasonically oscillate to remove Bubbles, so that the graphite is fully exposed to the purifying agent, heated by microwave to 85-95°C, stirred and kept for 3-5 hours; (4) dehydration: (5) washing; (6) drying: (7) purity test; and (8) packaging. Experiments have proved that the method of the present invention can effectively stabilize iron in the liquid phase, increase the amount of iron dissolved, thereby promoting the improvement of graphite purity and the reduction of metal ions, and at the same time solves the safety hazards caused by acid mist corrosion in surrounding buildings. Problems, the purification process is more stable, environmentally friendly and safe.

Description

technical field [0001] The invention relates to a method for purifying graphite, in particular to a method for purifying high-carbon graphite. The invention belongs to the technical field of chemical production. Background technique [0002] Lithium-ion batteries are widely used in electrical equipment due to their high energy density, light volume, good cycle performance, and no memory effect. However, lithium is an excellent electronic conductor but a poor ion conductor. Therefore, lithium-ion batteries Positive and negative electrodes often have both intercalation and deintercalation of lithium ions or lithium atoms. In order to improve the conductivity, layered carbon materials are often used as electrode materials, that is, graphite or graphene. Graphene does not yet have industrial production and application capabilities. Natural flake graphite has a wide range of sources, low price, and does not require high-temperature graphitization treatment. It is beneficial to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/215
CPCC01B32/215
Inventor 张文斌魏丽丹刘美多王艳梅秦丽婷
Owner HEILONGJIANG UNIV OF TECH
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