Quick AnswerCalcite is the natural crystalline form of calcium carbonate, soft (Mohs ~3) — wear is not the main issue, the real test is how fine you grind and how accurate the classification is. For 80–325 mesh base filler, a YGM high-pressure mill does the job; for 200–400 mesh at volume, an LM vertical roller mill; for 325–2500 mesh ultrafine, an HGM three-ring mill; for high-end ultrafine above 1250 mesh, an LUM ultrafine vertical mill saves more power. Pre-crush lumps below 20 mm with a jaw ...

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