Comminution employing liquid nitrogen pretreatments

Technical Report · Thu Nov 01 00:00:00 EST 1990

DOI:https://doi.org/10.2172/6350307· OSTI ID:6350307

Yen, S C ^[1]; Hippo, E J ^[2]

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1. Southern Illinois Univ., Carbondale, IL (USA). Dept. of Civil Engineering and Mechanics
2. Southern Illinois Univ., Carbondale, IL (USA). Dept. of Mechanical Engineering and Energy Processes

The goal of this project is to develop a methodology that will lead to the establishment of an effective, efficient technique for ultrafine grinding of coal. We believe that the key to successful coal grinding is strongly dependent upon the change of the brittleness of coal under a freezing temperature pretreatment. Furthermore, a cryogenic grinding process may provide the basis for the development of advanced technologies involving the separation of the pyritic minerals from coal. Specific objectives of the program are to: determine the effect of low temperature pretreatments on the microfracture development along the coal/pyrite interface and on the fracture resistance (brittleness) of coal. Specifically, we intend to examine the effect of direct contact of coal with liquid nitrogen, dry ice, and dry-iced acetone. Also, we intend to study pyrite liberation as a result of these treatments; determine the fracture resistance of coal under different low temperature pretreatments; determine the relationships between the fracture resistance of coal and the effectiveness of a grinding process; determine the effect of the frozen coal grinding on the pyrite liberation; evaluate factors which might effect process design, scale-up, and economics; and make a first pass economic assessment of the process. 15 refs., 13 figs., 3 tabs.

• Research Organization: Southern Illinois Univ., Carbondale, IL (USA). Coal Extraction and Utilization Research Center
• Sponsoring Organization: DOE/FE
• DOE Contract Number: FC22-89PC89904
• OSTI ID: 6350307
• Report Number(s): DOE/PC/89904-T18; ON: DE91005735
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
FRACTURE PROPERTIES
PYRITE
COMMINUTION
FREEZING
GRINDING
LIQUEFIED GASES
MICROSTRUCTURE
NITROGEN
PARTICLE SIZE
PROGRESS REPORT
TEMPERATURE EFFECTS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CRYSTAL STRUCTURE
DOCUMENT TYPES
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
IRON COMPOUNDS
IRON SULFIDES
MACHINING
MATERIALS
MECHANICAL PROPERTIES
MINERALS
NONMETALS
SIZE
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
010300* - Coal
Lignite
& Peat- Preparation- (1987-)
010600 - Coal
Lignite
& Peat- Properties & Composition