Abstract: The valuable mineral of a sulfurous iron ore in Guizhou is pyrite，and the gangue minerals are mainly clay minerals such as kaolinite. The size distribution of pyrite is uneven，with the small ones less than 0.05 mm，and the large aggregate sizes up to 15 mm，mostly between 0.1 and 2.5 mm. The sulfur in the form of sulfide accounts for 97.97% of the total sulfur. In order to determine the development and utilization process of the ore，the mineral processing test was carried out. The results showed that the gravity total concentrate with a yield of 43.48%，S grade of 33.05% and S recovery rate of 91.30% can be obtained when 5~0.5 mm fraction in 5~0 mm crushed ore treated by jigging gravity separation and 0.5~0 mm fraction in 5~0 mm crushed ore treated by spiral chute gravity separation. Then，the total concentrate in gravity separation was ground to -200 mesh accounting for 65%，sodium silicate as disperser for slime，butyl xanthate + ammonium dibutyl dithiophosphate combined for collecting pyrite. With the cooperation of foaming agent 2^# oil and activating agent copper sulfate，sulfur concentrate with sulfur grade of 50.35% and recovery rate of 86.58% was obtained by a closed-circuit beneficiation process with one roughing，two cleaning， three scavenging and middling ore return in sequence. The test index is ideal，which can be used as the basis for development and utilization of the ore.

Key words: sulfurous iron ore, jigging, spiral chute, flotation, sulfur concentrate