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Title: Cleaning and dewatering fine coal

Fine coal is cleaned of its mineral matter impurities and dewatered by mixing the aqueous slurry containing both with a hydrophobic liquid, subjecting the mixture to a phase separation. The resulting hydrophobic liquid phase contains coal particles free of surface moisture and droplets of water stabilized by coal particles, while the aqueous phase contains the mineral matter. By separating the entrained water droplets from the coal particles mechanically, a clean coal product of substantially reduced mineral matter and moisture contents is obtained. The spent hydrophobic liquid is separated from the clean coal product and recycled. The process can also be used to separate one type of hydrophilic particles from another by selectively hydrophobizing one.
Inventors:
; ;
Issue Date:
OSTI Identifier:
1400259
Assignee:
VIRGINIA TECH INTELLECTUAL PROPERTIES, INC. NREL
Patent Number(s):
9,789,492
Application Number:
13/576,067
Contract Number:
FC26-05NT42457
Resource Relation:
Patent File Date: 2011 Jan 31
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Works referenced in this record:

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journal, October 1984

An investigation of a separation process involving liquid—water—coal systems
journal, January 1987

The Demineralization of Coal Using Selective Agglomeration by the T-Process
journal, January 1990

Particles as surfactants—similarities and differences
journal, March 2002

Particles Adsorbed at the Oil−Water Interface:  A Theoretical Comparison between Spheres of Uniform Wettability and “Janus” Particles
journal, August 2001
  • Binks, B. P.; Fletcher, P. D. I.
  • Langmuir, Vol. 17, Issue 16, p. 4708-4710
  • DOI: 10.1021/la0103315