Metallurgical coke: formation, structure and properties
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-
- Journal Information:
- Proc., Ironmaking Conf.; (United States), Vol. 41; Conference: 41. annual ironmaking conference, Pittsburgh, PA, USA, 28 Mar 1982
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBONIZATION
CHEMICAL REACTION KINETICS
COAL
COKE
MICROSTRUCTURE
PITCHES
ACTIVATION ENERGY
BLAST FURNACES
CARBON DIOXIDE
COAL RANK
COMPRESSION STRENGTH
GASIFICATION
HYDROGEN TRANSFER
LIQUID CRYSTALS
MORPHOLOGY
PETROLEUM PRODUCTS
POROSITY
THERMAL SHOCK
THERMAL STRESSES
CARBON COMPOUNDS
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
CRYSTALS
DECOMPOSITION
ENERGY
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
FURNACES
KINETICS
LIQUIDS
MATERIALS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
STRESSES
THERMOCHEMICAL PROCESSES
010401* - Coal & Coal Products- Carbonization- (-1987)
010600 - Coal
Lignite
& Peat- Properties & Composition