Mechanical Operations
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the

Differential wettability
Size
Volatile matter content
Density separation

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Mechanical Operations
A pebble mill

Both B and C
Employs flints or ceramic pebbles as the grinding medium
Is a ball mill
Is a tube mill lined with ceramic or other non-metallic liner

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