Metallurgical coke: formation, structure and properties

Conference · Fri Jan 01 04:00:00 EST 1982 · Proc., Ironmaking Conf.; (United States)

OSTI ID:6045403

Marsh, H

Metallurgical coke has an optical texture or microstructure composed of anisotropic carbon in the form of mosaics and flow-type anisotropy as well as isotropic carbon or inerts. The anisotropic carbon is formed via the intermediates of nematic liquid crystals and mesophase. The physical and chemical properties of the coal ultimately control the fluidity of the carbonization system and this, in turn, is important in controlling the size and shape of resultant anisotropy in the coke. Each component of the optical texture makes a contribution to coke performance. The interlocked, randomly orientated units of the mosaics, 1 to 10 ..mu..m diameter, are more resistant to crack propagation and fracture than is the isotropic carbon or the flow-type anisotropic carbon (length > 10 ..mu..m). Anisotropic carbon is more resistant to gasification than is isotropic carbon and this factor is relevant in discussion of solution-loss in the blast furnace. The mosaic units of anisotropic carbon, on gasification, do not develop the fissures which ooccur in the flow-type anisotropy and hence coke strength can be maintained relatively. The mosaics, which constitute a major part of the optical texture of metallurgical cokes, are more resistant to attack by alkali than the flow-type anisotropy. The isotropic carbon is probably more resistant. Co-carbonizations are described which produce cokes with these suitable optical textures. The concepts of hydrogen shuttling is introduced to explain the successful use of pitch additives in coal blends.

• Research Organization: Univ. of Newcastle upon Tyne, England
• OSTI ID: 6045403
• Report Number(s): CONF-8203108-
• Conference Information: Journal Name: Proc., Ironmaking Conf.; (United States) Journal Volume: 41
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010401* -- Coal & Coal Products-- Carbonization-- (-1987)
010600 -- Coal
Lignite
& Peat-- Properties & Composition
ACTIVATION ENERGY
BLAST FURNACES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CARBONIZATION
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COAL RANK
COKE
COMPRESSION STRENGTH
CRYSTAL STRUCTURE
CRYSTALS
DECOMPOSITION
ENERGY
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
FURNACES
GASIFICATION
HYDROGEN TRANSFER
KINETICS
LIQUID CRYSTALS
LIQUIDS
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MORPHOLOGY
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
PITCHES
POROSITY
REACTION KINETICS
STRESSES
THERMAL SHOCK
THERMAL STRESSES
THERMOCHEMICAL PROCESSES