Flotation kinetics of a pyritic gold ore

► Flotation kinetics of a pyritic gold ore was studied with respect to particle size. ► Gold recovery increased by 4% with grinding from a P80 of 205 microns to 53 microns. ► Second order kinetics is a much better representation of semi-batch flotation. ► The first order flotation rate constant is independent of particle size in this range. ► The second order flotation rate constant is more sensitive to variation of P80.