Effective disposal of phosphorus slag (PS) is crucial for ecosystem protection. Herein, this study proposed that NaSO (SS), NaSiO (NS), NaCO (SC) and NaOH (NH) were performed to prepare alkali-activated phosphorus slag cemented paste backfill material (AAPS-PB). The evolution mechanisms of setting time, rheological behavior and mechanical properties at different contents of various activators were systematically investigated. The mineral compositions, bonding structure, micromorphology and pore structure characteristics of AAPS-PB hydration products were further clarified by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), scanning electron microscopy-energy dispersive spectrometer (SEM-EDS) and mercury intrusion porosimeter (MIP). Results indicated that activators were proved to significantly promote the dissolution of PS at appropriate content. NH had stronger alkali activation ability in the early hydration period, whereas NS sufficiently improved the later strength, enhanced the denseness of hydration products and refined the pore structure characteristics. This study expands the avenues for high-value applications of PS.

中文翻译：

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碱活化磷渣胶结膏体充填材料性能研究：活化剂种类及用量的影响

磷渣（PS）的有效处置对于生态系统保护至关重要。本研究提出采用NaSO(SS)、NaSiO(NS)、NaCO(SC)和NaOH(NH)制备碱活化磷渣胶凝膏回填材料(AAPS-PB)。系统研究了不同活化剂含量下凝结时间、流变行为和力学性能的演变机制。通过X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、扫描电镜-能谱仪(SEM-EDS)进一步阐明了AAPS-PB水化产物的矿物成分、键合结构、微观形貌和孔隙结构特征和压汞孔隙率计（MIP）。结果表明，适当含量的活化剂能够显着促进PS的溶解。 NH在水化初期具有较强的碱活化能力，而NS则充分提高了水化后期的强度，增强了水化产物的致密性，细化了孔结构特征。这项研究拓展了 PS 高价值应用的途径。