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Gadjah Mada, Yogyakarta 55281, Indonesia 2. ..https://pnsprj.org/ball-mill/4uktbgt7/2020-05-23.html.. respectively. A high-energy milling machine 8000M SPEX ... The diameter of small ball is 0,5 mm. The time for grinding operations were 60, 120 and 180
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