A kind of natural crystalline flake graphite fine powder processing method for preparing high-purity graphite

A flake graphite and high-purity graphite technology, which is applied in the field of natural crystalline flake graphite fine powder treatment, can solve the problems of bad chlorine environment, poor process stability, and limited purification effect, and achieve multiple contact areas and contact probability, and increase the reaction The contact area and the effect of shortening the time for removing impurities

Active Publication Date: 2022-02-22
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, chlorine gas has an extremely bad impact on the environment, is toxic and highly corrosive. In order to reduce pollution and reduce the corrosion rate of equipment, strict sealing treatment is required in the production process; and the purification effect is limited and the process stability is poor, so it is difficult to obtain in actual industrial production. application
(4) The purification effect of the high-temperature method is excellent, and the impurity content is lower than 0.005%, but the high-temperature roasting furnace needs to be designed and constructed separately, so the investment in disposable equipment is large, the production cost is high, and the production scale is limited.
Since the particle size of the graphite fine powder after flotation is larger than the size of the inclusions of impurities, if the graphite fine powder is not pretreated, even if the above-mentioned impurity removal process is used, a good impurity removal effect cannot be obtained.
The traditional graphite purification process is to directly contact graphite concentrate with acid solution or alkali solution (alkali melt) or gas to remove impurities by chemical reaction, and does not perform any treatment on graphite concentrate, so the direct removal of impurities The effect is not ideal, and most of the inclusion impurities still have no chance to contact with the impurity removal medium

Method used

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  • A kind of natural crystalline flake graphite fine powder processing method for preparing high-purity graphite
  • A kind of natural crystalline flake graphite fine powder processing method for preparing high-purity graphite
  • A kind of natural crystalline flake graphite fine powder processing method for preparing high-purity graphite

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Effect test

Embodiment 1

[0033] Such as figure 1 Shown, a kind of natural crystalline flake graphite fine powder processing method that the present invention is used to prepare high-purity graphite specifically comprises the following steps:

[0034] 1) Under normal temperature and pressure, heat the graphite fine powder to 400°C-450°C, and then air quench to 0°C-5°C;

[0035] 2) Repeat step 1) for 5-20 times;

[0036] 3) After each heating and cooling cycle, the fine graphite powder is subjected to ultrasonic vibration treatment, the frequency of ultrasonic vibration treatment is 300MHZ-300GHZ, and the ultrasonic vibration treatment time is 30min-45min.

[0037] Wherein, in step (1), the heating of graphite adopts electromagnetic induction heating or microwave vibration heating. The electromagnetic induction heating method is high-frequency heating; the working frequency of microwave heating is 300MHZ~300GHZ.

[0038] It takes 10min to 15min for the temperature of graphite fine powder to drop from...

Embodiment 2

[0040] The present invention is a kind of processing method for the natural crystalline flake graphite fine powder that is used for preparing high-purity graphite, specifically comprises the following steps:

[0041] 1) Under normal temperature and pressure, heat the graphite fine powder to 450°C, and then air-cool it rapidly to 0°C;

[0042] 2) Repeat the operation of step 1) 10 times;

[0043] 3) After each heating and cooling cycle, the fine graphite powder is subjected to ultrasonic vibration treatment, the frequency of ultrasonic vibration treatment is 10GHZ, and the ultrasonic vibration treatment time is 30min1.

[0044] Wherein, in step (1), the heating of graphite adopts electromagnetic induction heating or microwave vibration heating. The electromagnetic induction heating method is high-frequency heating; the working frequency of microwave heating is 10GHZ.

[0045] It takes 10 minutes for the temperature of graphite fine powder to drop from 450°C to 0°C.

Embodiment 3

[0047] The present invention is a kind of processing method for the natural crystalline flake graphite fine powder that is used for preparing high-purity graphite, specifically comprises the following steps:

[0048] 1) Under the protection of inert gas, heat the graphite fine powder to 700°C, and then quench the inert gas to 2°C;

[0049] 2) Repeat the operation of step 1) 6 times;

[0050] 3) After each heating and cooling cycle, the fine graphite powder is subjected to ultrasonic vibration treatment, the frequency of ultrasonic vibration treatment is 10GHZ, and the ultrasonic vibration treatment time is 30min.

[0051] Wherein, in step (1), the heating of graphite adopts electromagnetic induction heating or microwave vibration heating. The electromagnetic induction heating method is high-frequency heating; the working frequency of microwave heating is 10GHZ.

[0052] It takes 10 minutes for the temperature of graphite fine powder to drop from 700°C to 2°C.

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Abstract

The invention discloses a method for processing natural crystalline flake graphite fine powder for preparing high-purity graphite, which comprises the following steps: (1) heating the graphite fine powder to raise the temperature, and then rapidly cooling; (2) repeating step (1) Operate 5-20 times; (3) After each heating and cooling cycle, ultrasonic vibration treatment is performed on the fine graphite powder. The method provides graphite fine powder intermediates for the subsequent graphite purification process, thereby improving the impurity removal effect, shortening the impurity removal time, improving the impurity removal efficiency, and reducing the impurity removal cost.

Description

technical field [0001] The invention relates to the technical field of graphite purification, in particular to a method for processing natural crystalline flake graphite fine powder for preparing high-purity graphite. Background technique [0002] Natural graphite generally occurs in ores such as graphite schist, graphite gneiss, graphite-containing schist and metamorphic shale. The chemical composition of graphite is carbon (C). Naturally occurring graphite is rarely pure and often contains impurities, including SiO 2 , Al 2 o 3 , MgO, CaO, P 2 o 5 , CuO, V2O5, H2O, S, FeO and H, N, CO 2 , CH 4 , NH 3 Wait. The technical performance and use of graphite are mainly determined by its crystallization degree. Natural graphite can be divided into two industrial types: crystalline graphite (flake graphite) and aphanitic graphite (earth graphite) according to its crystallization form. [0003] In crystalline (flaky) graphite ore, graphite crystals have a diameter greater ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/215
CPCC01B32/215
Inventor 罗大伟汪锐黄舰
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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