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A method of ball milling pretreatment combined with chemical method to prepare ultra-fine clean coal

A combined preparation and pretreatment technology, applied in the fields of biofuels, solid fuels, petroleum industry, etc., can solve the problems of narrow distribution range, high ash content, small particle size, etc., and achieve the effect of improving the effect of impurity removal.

Active Publication Date: 2021-04-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 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 clean coal by combining ball milling pretreatment and chemical method. The final 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 99.5wt %

Method used

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  • A method of ball milling pretreatment combined with chemical method to prepare ultra-fine clean coal
  • A method of ball milling pretreatment combined with chemical method to prepare ultra-fine clean coal
  • A method of ball milling pretreatment combined with chemical method to prepare ultra-fine clean coal

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Experimental program
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Effect test

Embodiment 1

[0038] 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.

[0039] Take 50g of pulverized coal after devolatilization, add it to a zirconia ball mill tank, add 10ml of absolute ethanol to the ball mill tank, choose zirconia balls as the medium ball, and control the gradation of the 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.

[0040] Mix ultra-fine coal powder and 10wt% ethanol of ultra-fine coal powder evenly, add to the mixed immersion solution of hydrochloric acid and sodium fluoride to remove im...

Embodiment 2

[0042] 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.

[0043] Take 50g of pulverized coal after devolatilization, add it to a zirconia ball mill tank, add 10ml of absolute ethanol to the ball mill tank, choose zirconia balls as the medium ball, and control the gradation of the 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.

[0044] Mix ultra-fine coal powder and 10wt% ethanol of ultra-fine coal powder evenly, add to the mixed immersion solution of hydrochloric acid and sodium fluoride to remove impurities, ...

Embodiment 3

[0046] 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.

[0047] Take 50g of pulverized coal after devolatilization, add it to the zirconia ball mill tank, add 10ml of absolute ethanol into the ball mill tank, choose zirconia ball as the medium ball, and control the gradation of the medium ball as medium ball: small ball = 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.

[0048] Mix ultra-fine coal powder and 10wt% ethanol of ultra-fine coal powder evenly, add to the mixed immersion solution of hydrochloric acid and sodium fluoride to remove impurities, w...

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Abstract

The invention discloses a method for combining ball milling pretreatment-chemical method to prepare superfine clean coal, which comprises the following steps: (1) crushing anthracite and roasting it in a protective atmosphere to obtain coal particles; Add a dispersant, control the gradation of the balls, carry out ball milling, and then dry to obtain superfine coal powder; (2) After mixing superfine coal powder and surfactant, add it to the mixed immersion solution of acid and fluoride salt, heat After leaching, filter, wash and dry to obtain superfine clean anthracite coal powder. The present invention removes volatile matter from the crushed anthracite in a protective atmosphere and cooperates with ball milling pretreatment to obtain ultra-fine coal powder with small particle size and narrow distribution range, and then removes impurities to increase the purity of the obtained ultra-fine coal powder Not less than 99.5wt%.

Description

technical field [0001] The invention relates to a method for combining ball milling pretreatment and chemical method to prepare superfine clean coal, and belongs to the technical field of preparation of functional carbon powder materials. [0002] technical background [0003] Clean coal is a high value-added coal product that can be used as a high calorific value fuel to replace diesel and natural gas for internal combustion engines, gas turbines, aviation turbine engines, etc. Internal combustion engine fuel generally requires the ash content of ultra-pure coal to be below 1.0%. On the other hand, clean coal can also be used to prepare high-quality high-performance carbon materials, such as carbon fiber composite materials, graphite electrodes, new energy materials and other fields. Therefore, the preparation of clean coal is an inevitable trend of fine coal processing and increased added value, and research on mineral dissociation and clean coal preparation technology to o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L5/04C10L9/08C10L9/02
CPCC10L5/04C10L9/02C10L9/083C10L2290/08C10L2290/22C10L2290/28C10L2290/545C10L2290/547Y02E50/10
Inventor 肖劲唐雷仲奇凡张振华
Owner CENT SOUTH UNIV
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