Fuels and Combustion
A good metallurgical coke

Must contain moderate quantities of ash, moisture, sulphur and volatile matters
Should have low fusion point of its ash
Should have high porosity
Should be brittle

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Fuels and Combustion
The weathering index of a coal

Is related to its calorific value
Gives an idea of the fusion temperature of ash
Is a measure of its caking tendency
Is a measure of its size stability, when stored & exposed to weather

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