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Natural crystalline graphite fine powder activation method for preparing high-purity graphite

A technology of crystalline graphite and high-purity graphite, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of poor process stability, limited purification effect, bad influence of chlorine environment, etc., to increase the reaction contact area, The effect of improving the dissociation rate of monomers and shortening the time of impurity removal

Active Publication Date: 2020-04-17
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Experimental program
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Effect test

Embodiment 1

[0035] Such as figure 1 Shown, a kind of natural crystalline graphite fine powder activation method that the present invention is used to prepare high-purity graphite comprises the following steps:

[0036] 1) Under the protection of inert gas, heat the graphite fine powder to 1300°C-1500°C by means of electromagnetic induction heating, and keep it warm for 20-100min;

[0037] 2) Under the protection of inert gas, the graphite fine powder is rapidly cooled to below 450°C, and ultrasonic vibration treatment is performed. The frequency of ultrasonic vibration treatment is 28KHZ-120KHZ, and the ultrasonic vibration treatment time is 5min-10min;

[0038] 3) Finely grind the fine graphite powder, and then sieve the fine graphite powder to collect the fine graphite powder with a mesh size between -100 and +200.

Embodiment 2

[0040] A kind of natural crystalline graphite fine powder activation method for preparing high-purity graphite of the present invention comprises the following steps:

[0041] 1) Under the protection of inert gas, the graphite fine powder is heated to 1400°C by electromagnetic induction heating method, and kept for 40 minutes;

[0042] 2) Under the protection of inert gas, the graphite fine powder is rapidly cooled to below 450°C, and ultrasonic vibration treatment is performed. The frequency of ultrasonic vibration treatment is 60KHZ, and the ultrasonic vibration treatment time is 8 minutes;

[0043] 3) Finely grind the fine graphite powder, and then sieve the fine graphite powder to collect the fine graphite powder with a mesh size between -100 and +200.

Embodiment 3

[0045] A kind of natural crystalline graphite fine powder activation method for preparing high-purity graphite of the present invention comprises the following steps:

[0046] 1) Under the protection of inert gas, the graphite fine powder is heated to 900°C by electromagnetic induction heating method and kept for 40 minutes;

[0047] 2) Under the protection of inert gas, the graphite fine powder is rapidly cooled to below 450°C, and ultrasonic vibration treatment is performed. The frequency of ultrasonic vibration treatment is 60KHZ, and the ultrasonic vibration treatment time is 8 minutes;

[0048] 3) Finely grind the fine graphite powder, and then sieve the fine graphite powder to collect the fine graphite powder with a mesh size between -100 and +200.

[0049] The difference between this embodiment and embodiment 2 is that the heating temperature is 900°C.

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Abstract

The invention discloses a natural crystalline graphite fine powder activation method for preparing high-purity graphite. The method comprises the following steps: (1) heating graphite fine powder to 1300-1400 DEG C under the protection of inert gas; (2) rapidly cooling the graphite fine powder to below 450 DEG C under the protection of inert gas; and (3) carrying out fine grinding treatment on thegraphite fine powder, and then carrying out screening treatment. According to the invention, the graphite fine powder intermediate is provided for the subsequent graphite purification process, so that the impurity removal effect is improved, the impurity removal time is shortened, the impurity removal efficiency is improved, and the impurity removal cost is reduced.

Description

technical field [0001] The invention relates to the field of graphite purification, in particular to a method for activating natural crystalline 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 than 1 μm and ar...

Claims

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Application Information

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IPC IPC(8): C01B32/215
CPCC01B32/215
Inventor 罗大伟汪锐黄舰
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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