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Preparation method of ultrafine ashless coal for new energy anode

An ash-free coal and new energy technology, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of narrow distribution range, high ash content, and large particle size of coal powder, so as to improve the impurity removal effect and meet the Purity and particle size requirements, and the effect of promoting the impurity removal process

Active Publication Date: 2019-08-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the technical problems of high ash content and excessively large coal particle size after the existing pulverized coal is removed, the purpose of the present invention is to provide a method for preparing ultra-fine ash-free coal for new energy negative electrodes. Anthracite is de-volatileed in a protective atmosphere and pretreated with ball milling to obtain ultra-fine coal powder with small particle size and narrow distribution range. After impurity removal, the purity of the obtained ultra-fine coal powder is not less than 99.9wt%.

Method used

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  • Preparation method of ultrafine ashless coal for new energy anode
  • Preparation method of ultrafine ashless coal for new energy anode
  • Preparation method of ultrafine ashless coal for new energy anode

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The anthracite was preliminarily crushed to -200 mesh, placed in a corundum crucible, and kept at 600°C for 8 hours in a nitrogen atmosphere in a muffle furnace to remove volatile matter.

[0041] Take 30g of pulverized coal after devolatilization, add it into the zirconia ball mill tank, add 10ml of absolute ethanol into the ball mill tank, choose zirconia balls as the medium ball, and control the gradation of medium balls as medium balls: small balls = 1:1, Ball-to-material ratio = 10:1, planetary ball mill speed 300r / min, ball milling time 12h, after drying in a vacuum drying oven for 4h, a well-dispersed ultra-fine coal powder was obtained, and the particle size of the coal powder was measured by a laser particle size tester distribution, such as figure 1 As shown, D50=0.855 μm, D90=1.609 μm.

[0042] Mix ultra-fine coal powder and NaOH at a mass ratio of 0.6:1.0, add 130g of deionized water, 10wt% ethanol (NaOH concentration is 4.0mol / L), soak in water and alkali ...

Embodiment 2

[0044] Anthracite was initially crushed to -200 mesh, placed in a corundum crucible, and kept at 650°C for 4 hours in a nitrogen atmosphere in a muffle furnace to remove volatile matter.

[0045] Take 30g of pulverized coal after devolatilization, add it into the zirconia ball mill tank, add 10ml of absolute ethanol into the ball mill tank, choose zirconia balls as the medium ball, and control the gradation of medium balls as medium balls: small balls = 1:1, Ball-to-material ratio = 5:1, planetary ball mill speed 300r / min, ball milling time 10h, after drying in a vacuum drying oven for 4h, a well-dispersed ultra-fine coal powder is obtained, and the particle size of the coal powder is measured by a laser particle size tester distribution, such as figure 2 As shown, D50=1.592 μm, D90=2.889 μm.

[0046] Mix ultra-fine coal powder and NaOH at a mass ratio of 0.8:1.0, add 130g of deionized water and 10wt% ethanol (NaOH concentration is 5.0mol / L), soak in water and alkali at 210°...

Embodiment 3

[0048] Anthracite was initially crushed to -200 mesh, placed in a corundum crucible, and kept at 650°C for 4 hours in a nitrogen atmosphere in a muffle furnace to remove volatile matter.

[0049] Take 30g of pulverized coal after devolatilization, add it into the zirconia ball mill tank, add 10ml of absolute ethanol into the ball mill tank, choose zirconia balls as the medium ball, and control the gradation of medium balls as medium balls: small balls = 1:2, Ball-to-material ratio = 10:1, planetary ball mill speed 300r / min, ball milling time 8h, after drying in a vacuum drying oven for 4h, a well-dispersed ultra-fine coal powder is obtained, and the particle size of the coal powder is measured by a laser particle size tester distribution, such as image 3 As shown, D50=1.536 μm, D90=2.937 μm.

[0050] Mix ultra-fine coal powder and NaOH at a mass ratio of 0.6:1.0, add 130g of deionized water, 10wt% ethanol (NaOH concentration is 4.0mol / L), soak in water and alkali at 210°C fo...

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Abstract

The invention discloses a preparation method of ultrafine ashless coal for a new energy anode. The method comprises steps that (1), anthracite is crushed and calcined in the protective atmosphere to obtained coal particles; dispersing agent is added to the obtained coal particles, and grinding ball grading is controlled for ball grinding and then dried to obtain ultra-fine coal powder; (2), the ultrafine coal powder, alkali and surfactant are mixed and are then hydrothermally leached, filtered, washed and dried to obtain alkali-soluble coal; and (3), the alkali-soluble coal is added to mixed immersion solution of acid and fluoride salt, and the mixture is hydrothermally leached, filtered, washed and dried to obtain the ultrafine ashless coal powder. The method is advantaged in that throughremoving volatile matters from the broken anthracite in the protective atmosphere and cooperating with ball grinding pretreatment, the ultrafine coal powder having the small particle size and the narrow distribution range can be obtained, after impurity removal, the obtained ultrafine coal powder has purity of not less than 99.9 wt%.

Description

technical field [0001] The invention relates to a method for preparing ultrafine ash-free coal for new energy negative electrodes, and belongs to the technical field of preparation of functional carbon powder materials. [0002] technical background [0003] As an emerging industry, new energy materials have ushered in explosive growth as the country has continuously increased support policies for the new energy industry in recent years. Energy storage and conversion devices determine the key to the development of the new energy industry, and the key to energy storage and conversion devices lies in materials. In recent years, the improvement in the performance of lithium-ion batteries is also mainly attributed to the substantial improvement in the performance of carbon anode materials. At present, coal-based carbon materials are rich in raw materials and low in cost. If coal-based carbon materials for lithium-ion battery anodes can be researched and developed to replace the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/0525
CPCH01M4/362H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 肖劲唐雷仲奇凡王志安
Owner CENT SOUTH UNIV
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