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Cleaning and dewatering fine coal

United States Patent

9,789,492
October 17, 2017
View the Complete Patent at the US Patent & Trademark Office
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.
Yoon; Roe-Hoan (Blacksburg, VA), Eraydin; Mert K. (Blacksburg, VA), Freeland; Chad (Babbitt, MN)
VIRGINIA TECH INTELLECTUAL PROPERTIES, INC. (Blacksburg, VA)
13/ 576,067
January 31, 2011
STATEMENT OF GOVERNMENT SUPPORT This invention was made with government support under Grant No. DE-FC26-05NT42457 awarded by the US Department of Energy. The government has certain rights in the invention.