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BALL MILL 1 REPORT - Momentum Transfer and . 5. The ball mill is operated at 70 of the critical speed i.e, 120 rpm for 5 minutes. Place the sample on a paper and perform sieving again for a specific time of 7mins. 6. Now, again repeat the above procedure by placing the sample in the ball mill for two more times time intervals being 5 and 5 ...