Firstly, the raw material including calcite, limestone, chalk, shells, etc. transported from the quarry are selected by hand to remove the gangue; then the stones are crushed with a stone crusher, and then feed crushed material to HGM powder grinding mill to obtain ultra fine powder. Finally Use a classifier to classify the milled powder, and the powder that meets the particle size requirements is packed into the warehouse as a product, otherwise return to the calcium carbonate powder mill for regrinding.