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screening ball mill milled

Mar 01 2020 · To obtain the ball milled samples 18 g of each biochar was added into a 500 mL agate jar with 180 g of grinding balls diameter 6 mm and mass ratio of ballbiochar 1001 The jars were then placed in a planetary ball mill PQN2 Across International products NJ USA which was operated at 300 rpm for 12 h with a rotation direction

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