Fuels and Combustion
Lignite is

A high rank coal
A coking coal
A black banded coal which burns with a non-smoky yellowish flame
Can be used for gasification and steam generation

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Fuels and Combustion
Froth floatation is used for

All of these
Removing ash from the coal based on difference in specific gravity of coal and ash
Washing fine coal dust (< 0.5 mm size)
Washing lump coal (> 80 mm size)

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