Ball Mill - an overview | ScienceDirect Topics

Ball mills tumble iron or steel balls with the ore. The balls are initially 5–10 cm diameter but gradually wear away as grinding of the ore proceeds. The feed to ball mills (dry basis) is typically 75 vol.-% ore and 25% steel. The ball mill is operated in closed circuit with a particle-size measurement device and size-control cyclones.

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Ground Breakers: FMG posts impressive rebound despite iron ...

Fortescue Metals Group (ASX:FMG) shares have staged a stunning rally this morning to pull the materials sector to glory, even as spot iron ore prices tipped below US$90/t for the first time in over a year last night. FMG, which has spent the past several days in a ball of confusion about exactly how serious Andrew Forrest's multi-billion dollar green energy policies …

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