Abstract: In order to explore the application feasibility of flotation phosphate tailings in mine cement ⁃ ed filling，the material ratio test of phosphate tailings cemented filling was carried out，and the performance of filling body was optimized by using industrial solid waste and modifier.The test results show that when the full-size cemented filling is carried out with the flotation phosphate tailings of a chemical enterprise in Yichang，Hubei Province as the raw material，when the cement to sand ratio is 1 ∶4 and the filling slurry concentration is greater than 70%，the uniaxial compressive strength of the sample cured for 28 days is greater than 2.9 MPa，which meets the basic requirements of mine filling for strength (≥2 .0 MPa).After us⁃ ing industrial solid waste to replace about 35%of cement，and adding calcium oxide，sodium carboxymethyl cellulose (CMC)and sodium silicate (alkali activator)for optimization，the 28 d compressive strength of phosphate tailings cemented backfill can reach more than 3.3 MPa，and the pollutant release concentration meets the relevant environmental protection standards，which will not cause environmental pollution.This study provides a technical reference for the resource utilization of flotation phosphate tailings.

Key words: phosphate rock, flotation tailings, cementitious filling, uniaxial compressive strength