Thermal dewatering of coal. Progress report, October 1-December 31, 1984

Technical Report · Tue Jan 01 00:00:00 EST 1985

OSTI ID:5360268

Suuberg, E M; Deevi, S C

The following conclusions can be drawn from the work described in this paper. (1) The volumetric shrinkage accompanying dying of lignite appears to roughly proportional to the loss of moisture from the lignite. It is affected by macroscopicmechanical factors that are difficult to quantify at this time. The extent of shrinkage perpendicular to the bedding plane may be greater or less than that in directions parallel to the bedding plane, but macroscopic cracks generally develop first in a direction parallel to the bedding plane. (2) Mercury porosimetry is of limited applicability to coals of this rank. An enormous fraction of the porosity is found as macroscopic ''cracks'' that, depending upon sample preparation, may be difficult to distinguish from interparticle voidage. Some tentative evidence of compressibility effects has also been noted. Apparent hysteresis in the high pressure (perhaps compressibility-limited) range appears to be partly a kinetic effect. (3) As usual, CO/sub 2/ adsorption indicates specific surface areas about two orders of magnitude greater than does N/sub 2/ adsorption. There does appear to be an affect of drying on N/sub 2/ surface areas -generally the more severe the drying procedure, the lower the apparent surface area. The shape of the pore size distribution curve is largely unaffected by the severity of drying. There seems to be only a slight downward shift of the whole distribution curve with severity of drying. Mercury intrusion and gas adsorption porosity results from one another by an order of magnitude in the overlap region. The reasons for this are not yet fully understood. 11 refs., 13 figs., 7 tabs.

• Research Organization: Brown Univ., Providence, RI (USA). Div. of Engineering
• DOE Contract Number: AC18-84FC10617
• OSTI ID: 5360268
• Report Number(s): DOE/FC/10617-1915; ON: DE85018305
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CARBON DIOXIDE
ADSORPTION
DESORPTION
LIGNITE
POROSITY
SHRINKAGE
SORPTIVE PROPERTIES
SURFACE AREA
NITROGEN
ADSORPTION ISOTHERMS
COMPRESSIBILITY
DRYING
EXPERIMENTAL DATA
MEDIUM PRESSURE
MEDIUM TEMPERATURE
MOISTURE
POROSIMETERS
RESEARCH PROGRAMS
WATER REMOVAL
BROWN COAL
CARBON COMPOUNDS
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
COAL
DATA
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
INFORMATION
ISOTHERMS
MATERIALS
MEASURING INSTRUMENTS
MECHANICAL PROPERTIES
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
REMOVAL
SORPTION
SURFACE PROPERTIES
010600* - Coal
Lignite
& Peat- Properties & Composition