In this research, phosphogypsum composite cementing material using phosphogypsum powder, slag powder, fly ash and cement were prepared as the main cementing materials, and sodium silicate was used as the activator. The influence of the cement content of 0 wt.%, 5 wt.%, 10 wt.%, 15 wt.% and the change of 0%, 2%, 4% alkali equivalent on the mechanical properties of cementing materials was studied, the types and content of admixtures suitable for phosphogypsum cementitious materials were also studied. The cost of the materials used was calculated and analyzed. The results showed the increase in cement content and alkali equivalent will improve the mechanical properties of the cementitious material, and the strength can reach 23.0 MPa; the change of alkali equivalent had a more obvious impact on the early (1 d) mechanical properties of the cementitious material than cement; when these two factors synergistically worked, the cement content should not exceed 10 wt.%, or the mechanical properties of the material would decline; the effect of using the naphthalene-based water-reducing agent was better than that of the polycarboxylic acid water-reducing agent, and when cement, sodium silicate and naphthalene water reducer were used together, the maximum compressive strength of 7 d reached 24.4 MPa, which was higher than 39.4% of the sample without water reducer. The ratio used in the experiment was relatively low cost, which had a great reference value for the comprehensive utilization of industrial by-product phosphogypsum.

本研究以磷石膏粉、矿渣粉、粉煤灰和水泥为主要胶结材料，以水玻璃为活化剂，制备了磷石膏复合胶结材料。研究了水泥含量0 wt.%、5 wt.%、10 wt.%、15 wt.%和0%、2%、4%碱当量变化对胶结材料力学性能的影响，还研究了适用于磷石膏胶凝材料的外加剂的种类和含量。计算和分析了所用材料的成本。结果表明，水泥含量和碱当量的增加会提高胶凝材料的力学性能，强度可达23.0 MPa；碱当量的变化对胶凝材料早期（1 d）力学性能的影响比水泥更明显；当这两个因素协同作用时，水泥含量不应超过10wt.%，否则材料的力学性能会下降；使用萘系减水剂的效果优于聚羧酸系减水剂，当水泥、硅酸钠和萘系减水剂并用时，7 d的最大抗压强度达到24.4 MPa，高于不含减水剂样品的 39.4%。实验采用的配比成本相对较低，对工业副产磷石膏的综合利用具有较大的参考价值。当这两个因素协同作用时，水泥含量不应超过10wt.%，否则材料的力学性能会下降；使用萘系减水剂的效果优于聚羧酸系减水剂，当水泥、硅酸钠和萘系减水剂并用时，7 d的最大抗压强度达到24.4 MPa，高于不含减水剂样品的 39.4%。实验采用的配比成本相对较低，对工业副产磷石膏的综合利用具有较大的参考价值。当这两个因素协同作用时，水泥含量不应超过10wt.%，否则材料的力学性能会下降；使用萘系减水剂的效果优于聚羧酸系减水剂，当水泥、硅酸钠和萘系减水剂并用时，7 d的最大抗压强度达到24.4 MPa，高于不含减水剂样品的 39.4%。实验采用的配比成本相对较低，对工业副产磷石膏的综合利用具有较大的参考价值。使用萘系减水剂的效果优于聚羧酸系减水剂，当水泥、硅酸钠和萘系减水剂并用时，7 d的最大抗压强度达到24.4 MPa，高于不含减水剂样品的 39.4%。实验采用的配比成本相对较低，对工业副产磷石膏的综合利用具有较大的参考价值。使用萘系减水剂的效果优于聚羧酸系减水剂，当水泥、硅酸钠和萘系减水剂并用时，7 d的最大抗压强度达到24.4 MPa，高于不含减水剂样品的 39.4%。实验采用的配比成本相对较低，对工业副产磷石膏的综合利用具有较大的参考价值。