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__________________?
Correct answer: C. Flint or porcelain
- A. Bronze
- B. Stainless steel
- C. Flint or porcelain
- D. Concrete
Explanation
Pebble mills use flint pebbles or porcelain balls instead of iron media, preventing iron contamination of paints, pigments and cosmetics. Bronze and stainless steel can still introduce metallic contamination.
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