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CaCO3 Grinding

A process for fine ground and ultrafine ground calcium carbonate produced in a ufg dry grinding mill in closed circuit with a high efficiency air classifier.

9 micron topsize with 2 micron mean.            6 micron topsize with 1 micron mean

The feed material is fed pneumatically through a venturi eductor into the mill. The particles are pulverized by a high speed agitated grinding media. The grinding media can be stainless steel, chrome steel, alumina or zirconia. The micronized particles are entrained in the air stream and exit the mill in a high efficiency air classifier. The on size particles are separated and the oversize returned to the mill for regrinding.

This grinding process is suitable for calcium carbonate, marble and limestone grinding down to 1 micron average particle size