Fuels and Combustion
Froth floatation is used for

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

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Fuels and Combustion
Calorific value of

Light paraffinic fuel oils is equal to that of equivalent olefins
N-paraffin is lower than that of iso-paraffins of the same compounds
Light paraffinic fuel oils is higher than that of equivalent olefins
Light paraffinic fuel oils is lower than that of equivalent olefins

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