Abstract: Reverse flotation desulphurization experiment research on low intensity magnetic separation iron concentrate of Baogang concentrator that had a sulfide of 1.19%，and sulfide was magnetic pyrite and pyrite was conducted.The result showe that using sulfuric acid and JY-1 as regulators，and isoamyl xanthogenate-K as collectors，and using a reverse flotation flowsheet of one roughing two cleaning three scavenging，could obtain iron concentrate of sulfur content at 0.48%，and iron recovery rate at 97.05%.

Key words: Iron concentrate after magnetic separation, Desulphurization, Iron recovery rate