Abstract: A rational reagent regime and process for a finely disseminated fluorite ore from Inner Mongolia were determined through flotation test research.The flotation test adpoted the self-developed modified fatty acid salt YSB-2 as collector and was carried out at a normal temperature (24 ℃).The process was composed of one rougher in weakly alkaline medium（pH=9.0）and seven cleaners in weakly acidic medium (pH=6.0).The tail of cleaner I was the final tail and the middlings were concentrated and returned to the acidic-alkaline process.A high grade fluorite concentrate assaying CaF₂ 98.70% at a CaF₂ recovery of 89.20%, SiO₂ 0.93% and CaCO₃ below 0.37% was produced.

Key words: Finely disseminated fluorite, Acidic-alkaline flotation process, Collector YSB-2