Ball mills and tube mills with flint or porcelain balls are used for size reduction of_______________?
Correct answer: C. Non-metallic ores
- A. Asbestos
- B. Rubber
- C. Non-metallic ores
- D. Limestone
Explanation
Flint or porcelain balls are hard, wear-resistant grinding media used to reduce non-metallic ores while minimising metallic contamination. Ball and tube mills are common choices for this service.
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