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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

Other works cited in this record:

Removal of fine particles from a gas stream by solid particle addition in venturi contactor
patent, October 1979

Treatment of coal slurries
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Treating and cleaning coal methods
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Coal recovery process
patent, February 1981

Methods for processing coal
patent, November 1984

Process for removing mineral matter from coal
patent, September 1986

Time-controlled processes for agglomerating coal
patent, September 1988

Preagglomeration of fine coal before thermal dryer in a preparation plant
patent, May 1989

Inclined fluidized bed system for drying fine coal
patent, February 1992

Method for separating fine particles by selective hydrophobic coagulation
patent, November 1992

Method and apparatus for dewatering
patent, August 1993

Method for simultaneous use of a single additive for coal flotation, dewatering, and reconstitution
patent, January 1995

Method for dewatering fine coal
patent, October 1995

Methods of using natural products as dewatering aids for fine particles
patent, March 2003

Coal beneficiation by gas agglomeration
patent, October 2003

Methods of enhancing fine particle dewatering
patent, February 2005

Methods of increasing flotation rate
patent-application, August 2003

Methods of Enhancing Fine Particle Dewatering
patent-application, March 2008

A survey of oil agglomeration in wet fine coal processing
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

The Licado Coal Cleaning Process: A Strategy For Reducing SO2 Emissions From Fossil-Fueled Power Plants
conference, 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

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