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

For efficient grinding, ball mills must be operated

Rittinger's crushing law states that

Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.

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