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%.
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