Fuels and Combustion
Presence of phosphorous in metallurgical coal

Reduces its calorific value
Badly affects the quality of steel
Is not undersirable
Increases its caking power

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Fuels and Combustion
Rate of low temperature oxidation of coal due to bad storage conditions

Decreases with increase in surface area
Is accelerated by storage in large heaps with small surface to volume ratio
Does not vary with increase in surface area
Is more for low volatile coal compared to high volatile coal

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