Mechanical Operations
Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of

Concrete
Bronze
Flint or porcelain
Stainless steel

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Mechanical Operations
In case of grinding in a ball mill

Grinding cost and power requirement increases with increasing fineness of the products
All of these
Wet grinding achieves a finer product size than dry grinding
Its capacity decreases with increasing fineness of the products

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