Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing ultrafine clean coal by ball milling pretreatment-chemical combined method

A combined preparation and pretreatment technology, applied in the petroleum industry, biofuels, solid fuels, etc., can solve the problems of narrow distribution range, large particle size of pulverized coal, and high ash content, meet the requirements of purity and particle size, promote The effect of removing impurities and improving the effect of removing impurities

Active Publication Date: 2019-07-12
CENT SOUTH UNIV
View PDF15 Cites 4 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing ultrafine clean coal by ball milling pretreatment-chemical combined method
  • Method for preparing ultrafine clean coal by ball milling pretreatment-chemical combined method
  • Method for preparing ultrafine clean coal by ball milling pretreatment-chemical combined method

Examples

Experimental program
Comparison scheme
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 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 = 1:1, 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 into a 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.

[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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
acid concentrationaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing ultrafine clean coal by a ball milling pretreatment-chemical combined method. The method comprises the following steps: (1) crushing anthracite, roastingthe anthracite in a protective atmosphere to obtain coal particles, adding a dispersing agent into the obtained coal particles, controlling grading of grinding balls, carrying out ball milling, and then carrying out drying to obtain superfine coal powder; and (2) mixing the ultrafine coal powder with a surfactant, then adding the mixture into a mixed leaching solution of an acid and a fluoride salt, carrying out heating leaching, and then carrying out filtering, washing and drying to obtain the ultrafine clean anthracite powder. According to the method disclosed by the invention, volatile components in the crushed anthracite are removed in a protective atmosphere, and collaborative ball milling pretreatment is carried out, so that ultrafine coal powder with small particle size and narrowdistribution interval can be obtained, and the purity of the obtained ultrafine coal powder after impurity removal is not lower than 99.5 wt%.

Description

technical field [0001] The invention relates to a method for jointly preparing ultrafine clean coal by ball milling pretreatment and chemical method, and belongs to the technical field of functional carbon powder material preparation. [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 in internal combustion engines, gas turbines, aviation turbine engines, etc. Internal combustion engine fuel generally requires ultra-pure coal with an ash content of less than 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 processing of coal and the improvement of added value. To carry out research on mineral dissociation and clean coal preparati...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com