In　the　ammonium　dibutyl　dithiophosphate　flotation　system,　the　influence　of　Fe3+　on　the　flotation　of　digenite　was　investigated　through　single　mineral　flotation　experiments,　the　solution　chemistry　calculations　and　infrared　spectrum　analysis.　The　results　indicate　that　Fe3+　has　deterioration　effect　on　the　floatability　of　digenite,　and　the　formation　of　hydroxide　precipitation　is　the　effective　inhibition　component.　However,　the　sodium　citrate　can　make　the　iron　hydroxide　desorpt　from　the　surface　of　digenite,　which　is　beneficial　to　the　adsorption　of　the　ammonium　dibutyl　dithiophosphate　on　its　surface,　thus,　activating　the　flotation　of　digenite.　©　2018,　Science　Press.　All　right　reserved.