Abstract: Mineral processing study was carried out on a high-mud quartz-type fluorite ore with CaF₂ content of 41.14%, SiO₂ content of 42.59% and CaCO₃ content of 1.68% from Inner Mongolia. The two processes of flotation of sequential return of the middlings and discarding the tailings of scavenging from the middlings of cleaning Ⅰ were proposed based on the characteristics of the ore property, firstly, the fluorite rough concentrate was obtained by flotation with sodium carbonate and water glass as modifier, collector BK410B, a kind of low-temperature resistance modified fatty acid collector, and then the fluorite minerals were recovered by flotation separation from the fluorite rough concentrate after being reground with acidized water glass as modifier and the fluorite concentrate was obtained. The comparison tests were conducted by adopting two technological processes of sequential return of the middlings and discarding the tailings of scavenging from the middlings of cleaning Ⅰ. Finally, the flowsheet of discarding the tailings of scavenging from the middlings of cleaning Ⅰ was determined, and the results of closed-circuit test were obtained the fluorite concentrate with grading 97.68% CaF₂, 0.55% CaCO₃, 1.38% SiO₂ and CaF₂ recovery of 95.72%. It can be achieved efficient recovery of the fluorite minerals in new process of the ore.