Size Reduction Equipment
A Secondary crusher reduces these lumps into 6 mm (1/4 in). Grinders reduce crushed feed to powders The product from a intermediate grinder might pass a 40mesh screen Most of the product from a fine grinder would pass a 200 mesh screen with 74 micron opening. Size Reduction Equipment C. Ultrafine Grinders 1. Hammer Mills with internal classifiion 2. .