Electrode cokes from deashed bituminous coal (in German)
Comparison was made between coal types, their respective cokes, and mixtures of cokes for suitability in electrode manufacture. Bituminous and anthracite coals from various mine locations were deashed by flotation processes and by introduction into a laminar stream separator. For bituminous coals such as Auguste Viktoria coal, it was found that the hotter the coke oven wall, the greater the density and conductivity of the coke produced. It was also concluded that mixed cokes were often advantageous by increasing density and conductivity. These mixtures were made with various ratios of pitch cokes and deashed-coal cokes. Deashing with lye was found to decrease the coking ability of some coals such as Knurow coal which lost completely its coking ability. Lye deashing was more effective for Knurow and Berve coals while Andreas coal with a lower initial ash content was not deashed very well. In the deashing of anthracite, a laminar stream separator was found to produce the best results, and was often used in conjunction with flotation separation. For these tests, anthracites selected from the Kreftenscheer strata of Ludwig coal, as well as more average samples of anthracite, were used. 53% to 62% of physically deashed Ludwig anthracite was recovered, and after chemical deashing and coking, 0.40% ash was maintained in the coke. With lower yields, such as 33%, it was thought that coke could be produced with as little as 0.20% ash content. For anthracite such as Heinrich coal, deashing was not as favorable as for Ludwig coal. It was shown, however, it particles of Heinrich coal of 1 to 10 mm size only were processed by laminar streaming with a product yield of 52%, there would be obtained a coke with 0.40% ash after chemical deashing with lye and coking. A 39% yield would produce coke with a 0.30% ash content. 8 tables
- Research Organization:
- I.G. Farbenindustrie, A.G., Hoechstadt (Germany)
- OSTI ID:
- 6728484
- Report Number(s):
- TOM-286-91-95
- Country of Publication:
- United States
- Language:
- German
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010401 -- Coal & Coal Products-- Carbonization-- (-1987)
010402 -- Coal
Lignite
& Peat-- Purification & Upgrading
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ANTHRACITE
ASHES
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
CARBONIZATION
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CLEANING
COAL
COAL PREPARATION
COKE
COKING
COMMINUTION
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
DATA COMPILATION
DEASHING
DECOMPOSITION
DENSITY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRODES
ENERGY SOURCES
FLOTATION
FOSSIL FUELS
FUELS
GRAIN SIZE
HIGH TEMPERATURE
IGNITION
INFORMATION
MICROSTRUCTURE
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PITCHES
POROSITY
PRODUCTION
PURIFICATION
QUANTITY RATIO
REMOVAL
RESIDUES
SEPARATION PROCESSES
SIZE
TABLES
WASHING
YIELDS