Dewatering studies of fine clean coal

Technical Report · Tue Jan 01 00:00:00 EST 1991

OSTI ID:5568758

Parekh, B K ^[1]

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1. Kentucky Univ., Lexington, KY (USA). Center for Applied Energy Research

The main objective of the present research program is to study and understand dewatering characteristics of ultra-fine clean coal and to develop process parameters to effectively reduce the moisture to less than 20 percent in the clean coal product. The research approach under investigation utilizes synergistic effect of metal ions and surfactant to lower the moisture of clean coal using conventional vacuum dewatering technique. During this contract period adsorption of di-, tri-, and tetra-valent metal ions, and octadecylamine onto the clean coal was studied. The adsorption of divalent copper ions provided three charge reversal points (or zero-point-of-charges) for the clean coal. The lowest amount of moisture in the filter cake was obtained near the two charge reversal points of the copper-coal system. For the tri-valent aluminum ions and tetra-valent titanium ions one charge reversal, at pH 8.0 and pH 5.0 was observed, respectively. The moisture in the filter cake was lowest near the zero point of charge (ZPC) or both the metal ions. Adsorption of octadecylamine onto the coal provided one ZPC at pH {approximately}7. 0. However, moisture content of the filter cake was not significantly lowered at this pH Morphology of the filter cake obtained without the addition of metal ions or surfactant, showed segregation of large particle at the bottom of filter cake. Efforts are in progress to determine effect of combining metal ions and various (nonionic and anionic) surfactant on filtration, and utilizing a better approach to study the in-situ morphology of the filter cake. 13 figs.

• Research Organization: Illinois Dept. of Energy and Natural Resources, Springfield, IL (USA)
• Sponsoring Organization: USDOE; ILDENR; USDOE, Washington, DC (USA); Illinois Dept. of Energy and Natural Resources, Springfield, IL (USA)
• DOE Contract Number: FG22-90PC90176
• OSTI ID: 5568758
• Report Number(s): DOE/PC/90176-T29; ON: DE91014045
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
WATER REMOVAL
COPPER IONS
ADSORPTION
SURFACTANTS
DRYING
PH VALUE
PROGRESS REPORT
CARBONACEOUS MATERIALS
CHARGED PARTICLES
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
IONS
MATERIALS
REMOVAL
SORPTION
010402* - Coal
Lignite
& Peat- Purification & Upgrading
010600 - Coal
Lignite
& Peat- Properties & Composition