Natural graphite ore stripping and purifying method

A technology of natural graphite and purification method, which is applied in the field of natural graphite ore stripping and purification, can solve the problems of high technical difficulty, waste of resources and high cost in the purification of cryptocrystalline graphite, and achieves the effects of low cost, less pollutant generation and low price.

Active Publication Date: 2015-10-07
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for stripping and purifying natural graphite ore, which solves the problems of natural graphite ore in the prior art, especially the purification technology of aphanitic graphite, which is difficult, high in cost,

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0058] With aphanitic graphite ore powder 10kg (fixed carbon content is 43.2%, 200 orders), H 2 o 2 (1.0kg), ammonium formate (0.3kg) and H 2 O (30kg) is mixed and stirred evenly and loaded into the reaction tank, soaked statically for 5h, and stirred for 1h under UV light, and the graphite ore slurry is sent into a filter press for pressure filtration; the filter cake is mixed with 1.0kg (NH 4 ) 2 CO 3 、20L H 2 O mixed and stirred evenly, put into a 50L airtight reactor, and soaked statically for 32h. Start the reactor heating equipment, heat to 80°C for 5 hours, and cycle heating and cooling for 5 times. Send the heated graphite ore slurry into a filter press for pressure filtration, mash the filter cake, transfer it to an ultrasonic device, add 30L of water for ultrasonic peeling for 12 hours, transfer the ultrasonic graphite ore slurry into a 100L container, add 50L of water, stirred for 0.5h, static for 6h.

[0059] Centrifuge the upper dispersion liquid to obtain ...

Embodiment 2

[0061] With aphanitic graphite ore powder 10kg (fixed carbon content is 65.3%, 300 orders), (NH 4 ) 2 S 2 o 8 (0.5kg), acetamide (0.1kg) and H 2 O (20kg) was mixed and stirred evenly into the reaction tank, soaked statically for 12 hours, and visible light was illuminated for 1.5 hours under stirring, and the graphite ore slurry was sent to a filter press for pressure filtration; the filter cake was mixed with 3.0kg NH 4 HCO 3 、20L H 2 O mixed and stirred evenly, put into a 50L airtight reactor, and soaked statically for 24h. Start the reactor heating equipment, heat to 100°C for 4 hours, and cycle heating and cooling for 3 times. Send the heated graphite ore slurry into a filter press for pressure filtration, crush the filter cake, transfer it to an ultrasonic device, add 40L of water for ultrasonic peeling for 6 hours, transfer the ultrasonic graphite ore slurry into a 100L container, add 50L of water, stirred for 0.5h, static for 6h.

[0062] Centrifuge the upper di...

Embodiment 3

[0064] Aphanitic graphite ore powder 10kg (fixed carbon content is 78.3%, 200 mesh), HNO 3 (0.8kg), phthalimide (1.5kg) and H 2 O (20kg) is mixed and stirred evenly and loaded into the reaction tank, statically soaked for 5h, and visible light is illuminated for 2h under stirring, and the graphite ore slurry is sent into a filter press for pressure filtration; the filter cake is mixed with 5kg (NH 4 ) 2 CO 3 、30L H 2 O mixed and stirred evenly, put into a 50L reactor (open), and soaked statically for 30h. Start the reactor heating equipment, heat to 90°C for 5 hours, and cycle heating and cooling for 4 times. Send the heated graphite ore slurry into a filter press for pressure filtration, crush the filter cake, transfer it to an ultrasonic device, add 30L of water for ultrasonic peeling for 6 hours, transfer the ultrasonic graphite ore slurry into a 100L container, add 50L of water, stirred for 0.5h, static for 6h.

[0065] Centrifuge the upper dispersion to obtain graph...

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Abstract

The invention discloses a natural graphite ore stripping and purifying method. The method includes: mixing, by mass, 30-50% of graphite ore powder, 1-5% of oxidant, 0.2-5% of organic intercalator and the balance water, and standing for soaking for 2-10h; stirring while illuminating for 1-2h; press-filtering, washing and drying; feeding 10-50% of graphite ore filter cake, 0.5-40% of organic intercalator and the balance water into a reaction kettle, and mixing and standing; heating for 2-8h at temperature of 50-200 DEG C, and cooling for 3-5 times; press-filtering, washing, drying, mashing and feeding into an ultrasonic device for ultrasonic stripping for 0.5-12h; adding water for stirring, centrifuging and separating upper-layer suspension to obtain graphene and graphene nanosheets, and subjecting lower-layer precipitate to flotation to obtain high-carbon-content graphite; repeating the above steps to obtain high-purity graphite. By the method, the problem that natural graphite ore, especially aphanitic graphite is high in purifying technology difficulty, high in cost, severe in pollution and serious in resource waste in the prior art is solved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and relates to a method for stripping and purifying natural graphite ore. Background technique [0002] Graphite varieties mainly include artificial graphite and natural graphite. Synthetic graphite has high purity, but its production process requires extremely high energy consumption, which greatly increases its cost. Natural graphite contains more impurities, and its purification is cumbersome, which limits its development and application. Graphite resources are the dominant resource minerals in my country. my country is rich in graphite resources, and its reserves, production and sales rank first in the world. Graphite ore is mainly divided into two types: crystalline (flaky) graphite ore and aphanitic (earthy) graphite ore. Flake graphite ore can achieve the purpose of purifying flake graphite through the flotation process of coarse concentrate regrinding and re-election . The fl...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 徐伟箭欧恩才潘武何莉张杰
Owner HUNAN UNIV
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