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Preparing method of superfine pulverized coal

A technology of fine coal powder and raw coal, applied in the field of ultra-fine coal powder preparation, can solve the problems of wide particle size distribution of coal powder, complex preparation process, narrow distribution interval, etc., achieve narrow distribution interval, optimize process flow, and prevent agglomeration Effect

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

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the existing ultra-fine coal powder preparation process, the prepared coal powder particle size distribution is wide and too large, the purpose of the present invention is to provide a preparation method of ultra-fine coal powder, which can obtain the coal powder particle size D90 Ultra-fine coal powder <3μm and narrow distribution range, simple preparation process, suitable for industrial application

Method used

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  • Preparing method of superfine pulverized coal
  • Preparing method of superfine pulverized coal
  • Preparing method of superfine pulverized coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Anthracite coal from a place is initially 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 volatiles.

[0031] Take 50g of the devolatilized coal powder and add it to the zirconia ball mill tank, add 10ml of absolute ethanol to the ball mill tank, select zirconia ball as the medium ball, and control the gradation of the medium ball to the medium ball: small ball = 1:1, Ball-to-material ratio = 10:1, planetary ball mill speed 300r / min, ball milling time 12h, and 4h drying in a vacuum drying oven to obtain ultrafine coal powder with good dispersibility. The particle size of the coal powder is measured by a laser particle size tester. Distribution, such as figure 2 As shown, D50=0.855 μm and D90=1.609 μm. The fixed carbon content is 96.5%.

Embodiment 2

[0033] Anthracite coal from a place is initially crushed to -200 mesh, placed in a corundum crucible, and kept at 650°C for 4h in a nitrogen atmosphere in a muffle furnace to remove volatiles.

[0034] Take 50g of the devolatilized coal powder and add it to the zirconia ball mill tank, add 10ml of absolute ethanol to the ball mill tank, select zirconia ball as the medium ball, and control the gradation of the medium ball to the medium ball: small ball = 1:1, Ball-to-material ratio=5:1, planetary ball mill speed 300r / min, ball milling time 10h, and 4h drying in a vacuum drying oven to obtain ultrafine coal powder with good dispersibility. The particle size of the coal powder is measured by a laser particle size tester. Distribution, such as image 3 As shown, D50=1.592 μm and D90=2.889 μm. The fixed carbon content is 96.3%.

Embodiment 3

[0036] Anthracite coal from a place is initially crushed to -200 mesh, placed in a corundum crucible, and kept at 650°C for 4h in a nitrogen atmosphere in a muffle furnace to remove volatiles.

[0037] Take 50g of the devolatilized coal powder and add it to the zirconia ball milling tank. Add 10ml of absolute ethanol to the ball milling tank. The medium ball is zirconia ball, and the gradation of the control medium ball is medium ball: small ball = 1:2, Ball-to-material ratio=10:1, planetary ball mill speed 300r / min, ball milling time 8h, and 4h drying in a vacuum drying oven to obtain ultrafine coal powder with good dispersibility. The particle size of coal powder is measured by laser particle size tester. Distribution, such as Figure 4 As shown, D50=1.536 μm and D90=2.937 μm. The fixed carbon content is 96.2%.

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Abstract

The invention discloses a preparing method of superfine pulverized coal. The preparing method of superfine pulverized coal comprises the steps that after raw coal is broken, the raw coal is roasted inthe protective atmosphere, coal particles with the carbon content improved is obtained, a dispersion agent is added into the obtained coal particles, ball milling grading is controlled to carry out ball milling, drying is carried out, and the superfine pulverized coal is obtained. The superfine pulverized coal with the pulverized coal particle size D90 smaller than 3 micrometers and the narrow distribution section can be obtained, the preparing process is simple, and the method is suitable for industrial promotion and application.

Description

Technical field [0001] The invention relates to a preparation method of ultrafine coal powder, which belongs to the technical field of preparation of new carbon materials. [0002] technical background [0003] my country has abundant coal resources, but currently coal is mainly used as a primary energy source and coal conversion, with low comprehensive utilization rate and low added value of products. Therefore, the development of a comprehensive coal utilization technology, through the ultra-purification of anthracite coal, can obtain ultra-pure coal with high added value, which can be used in special coal-based materials, such as graphite electrodes and carbon fiber composite materials, which have become coal The inevitable trend of deep processing. [0004] Coal contains various complex minerals, and their occurrence states indicate that only by crushing the coal to a finer particle size, the minerals in it can be fully dissociated. The smaller the particle size of the coal powd...

Claims

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Application Information

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IPC IPC(8): B02C21/00B02C17/20
CPCB02C17/20B02C21/00
Inventor 肖劲王志安仲奇凡张振华
Owner CENT SOUTH UNIV
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