To widen the application field of iron tailings (ITs) and explore ITs potential use-value, ITs and aluminum phosphate (AHP) were introduced to prepare flame-retardant rigid polyurethane foam (FR-RPUF) composites. The chemical composition and mineral composition of ITs were investigated by X-ray diffraction, X-ray fluorescence. The flame retardancy, thermal stability, combustion performance and gas-phase products of FR-RPUF composites were investigated by limiting oxygen index, underwriters laboratories vertical burning test (UL-94), thermogravimetry (TG), cone calorimetry and thermogravimetric-infrared spectrometry (TG-FTIR). TG confirmed that ITs could effectively improve the thermal stability of FR-RPUF composites at high temperature. Cone calorimetry implied that ITs could significantly reduce heat release and toxic smoke release and thus improve the fire safety of the composites. TG-FTIR indicated that ITs effectively reduced the release intensity of hydrocarbons, aromatic compounds, CO, isocyanates and esters. Scanning electron microscope and Raman spectra showed ITs could improve the compactness and graphitization degree of the char residues for FR-RPUF composites.

中文翻译：

---

基于铁尾矿和磷酸铝的阻燃硬质聚氨酯泡沫复合材料：工业固废利用新策略

为拓宽铁尾矿（ITs）的应用领域，挖掘其潜在的使用价值，引入ITs和磷酸铝（AHP）制备阻燃硬质聚氨酯泡沫（FR-RPUF）复合材料。通过X射线衍射、X射线荧光研究了ITs的化学成分和矿物成分。通过极限氧指数、保险商实验室垂直燃烧试验(UL-94)、热重法(TG)、锥形量热法和热重-红外光谱法研究了FR-RPUF复合材料的阻燃性、热稳定性、燃烧性能和气相产物。 TG-FTIR）。TG证实ITs可以有效提高FR-RPUF复合材料的高温热稳定性。锥形量热法表明，ITs 可以显着减少热释放和有毒烟雾的释放，从而提高复合材料的防火安全性。TG-FTIR 表明，ITs 有效降低了烃类、芳香族化合物、CO、异氰酸酯和酯类的释放强度。扫描电子显微镜和拉曼光谱表明，ITs 可以提高 FR-RPUF 复合材料炭渣的致密性和石墨化程度。