Abstract: The explorative experiments on a gold mine mainly consisting of pyrite and chalcopyrite with gold grade of 1.53g / t are made to focus on the recovery of  sulfide metal minerals and to determine the flotation conditions by combining sodium carbonate pulping with Ammonium dibuyldithiophosphate + butyl xanthate. The optimum conditions with grinding fineness of -200 mesh 65.05%, the dosage of sodium carbonate 1 000 g / t, the ratio of ammonium dibuyldithiophosphate and butyl xanthate of 1∶3 at the dosage of 60 g/t are got from the testing. In open-circuit tests, the process of one-roughing, three-cleaning and one-scavenging is adopted, but the higher gold grade results in high gold grade in tailings. Hence, the closed-circuit test process of one-roughing, two-cleaning and two scavenging is adopted, obtaining flotation gold concentrate with Au grade of 70.26 g / t and gold recovery of 92.30%.

Key words: Gold mine, Flotation, Ammonium dibuyldithiophosphate, Butyl xanthate