关键词: &beta, -半水磷石膏, 铁矿尾矿, 胶结充填

Abstract: The β-semi-aquatic phosphogypsum as gas hard cementitious material has been widely used in building materials. This test studies β-semi-aquatic phosphogypsum' waterproof performance, condensation performance and the influence of the consumption of β-semi-aquatic phosphogypsum on iron ore tailings fillings. The result shows that its cementitious materials' softening coefficient is increased to be 0.82 through waterproof modified. At the same time, its mobility diameter is 150 mm, and the beginning and final setting time can be regulated from 2 h to 8 h. When β-semi-aquatic phosphogypsum and iron ore tailings is at the ratio of 1∶7, the compressive strength of 1 d, 3 d, 7 d reaches 0.65 MPa, 0.75 MPa, 1.30 MPa respectively, which fully meets the technology requirements and performance indicators of cement filling.

Key words: β-semi-aquatic phosphogypsum, Iron ore tailings, Cement filling