A low-grade fluorite barite flotation separation method, using water glass as an inhibitor of siliceous minerals and calcium carbonate minerals, using oleic acid as a collector of fluorite and barite, using starch, sodium sulfate, hydrochloric acid, sodium hexametaphosphate phosphorus as inhibitors of mineral barite. The invention can effectively separate the low-grade fluorite and barite flotation, and after the grade of the ore fluorite is 33.92%~40.14%, and the barite grade is 34.67%-35.33%, the mixture is separated by the mixed flotation. The fluorite concentrate with a grade of more than 95% and a recovery rate of 75.5% to 78.5%; a barite grade of 92.3% to 93.27% and a recovery rate of 75.2% to 79.73% of barite concentrate.
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