Bright coal is defined as__________________?
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Answer: C. Contains mainly vitrain & clarain and is generally coking
Explanation
Bright coal is composed predominantly of vitrain and clarain maceral components. These specific maceral groups possess excellent softening and swelling properties during heating. High concentrations of vitrain and clarain ensure that bright coal is generally coking. Coal petrography categorizes organic constituents into distinct macerals like vitrain and clarain. Vitrain appears as bright, glossy bands visible to the naked eye in coal seams. Clarain exhibits a silky luster and forms layered bands within bituminous coal.
Coke plant operators value bright coal fractions for producing high-strength metallurgical coke. Petrographic analysis helps engineers blend different coal seams for optimal blast furnace feed. Microscopic composition directly dictates the plastic behavior of coal during carbonization. Option A is incorrect because durain is dull coal rather than bright vitrain-rich material. Option B mentions fusain which is charcoal-like and non-coking, forming dull layers. Option D is false because bright coal containing vitrain and clarain is typically coking.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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