Abstract: The tailings of a Sichuan pyrite mine have a rather high sulfur content, leading to not only the waste of resource but also a serious pollution to the environment due to the large amount of acidic water produced in their long term deposit.Therefore, research was made on their retreatment.They were ground to 64.76% -0.074 mm and treated with a flotation process consisting of one roughing, one scavenging and two cleanings, where lime was used as regulator, ethyl xanthate as collector and 2# oil as frother.A sulfur concentrate with an 8.90% yield, 45.31% S grade and 83.11% S recovery was obtained and the pyrite cinder of which has an iron concentrate of about 60% and can be directly sold as iron concentrate

Key words: Pyrite tailings, Flotation, S grade