Fluorspar Beneficiation Process Plant13/02/2021· Samples of the ore were prepared for flotation by dry crushing to minus 10 mesh followed by wet stage grinding to minus 65 mesh in a laboratory pebble mill using Tuscaloosa city tap water that had about 45 parts per million equivalent calcium carbonate total hardness Prior to flotation the ground ore pulp was treated at about 40 percent solids in a mechanically agitated flotation cell