Discussion
Grinding media for a high-purity alumina powder would normally be made of
Answer: C
Correct answer: alumina of the same purity as the powder
Milling media wear, and whatever they are made of ends up in the powder. For a high-purity product the only acceptable contaminant is more of the same material, so the media are made of it - which is why alumina and zirconia media exist despite costing far more than steel.
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