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What is the working principle of ball mill?

(a) Impact and attrition

(b) Compression and attrition

(c) Shear and compression

(d) Tear and impact

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I'd like to ask this question from Size Reduction in portion Size Reduction of Food Processing Unit Operations

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The correct answer is (a) Impact and attrition

To elaborate: Ball mill works on the principle of impact and attrition. Size reduction is done by impact as the balls drop from near the top of the shell. A ball mill consists of a hollow cylindrical shell rotating about its axis.

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