The contributions of three operating parameters (moisture content, hydrated lime addition, magnetite concentrate substitution) to the crushing strength and Young’s modulus of granules in each stage of iron ore sintering were studied by applying the Taguchi method. The results indicated that the strength properties of the iron ore granules were greatly affected by its structure, which is composed of inner nuclei and an outer adhering layer. The granules with a thick adhering layer showed a clear changing trend in strength with increasing temperature, whereas those with a thin adhering layer showed additional fluctuations as their force–displacement responses were greatly determined by the nuclei. The granules with a thick adhering layer were generally more deformable and easier to break than that those with the thin adhering layer in most states. The signal-to-noise ratio and variance analysis indicated that moisture was the dominant parameter affecting the strength properties of the iron ore granules, as this factor controls the primary granule structure and material distribution. With the progress of sintering, the contribution of moisture to the quality characteristics gradually decreased (from ∼80% to 50%), whereas the contributions of hydrated lime and magnetite concentrate increased correspondingly (from ∼5% to 20%).

应用Taguchi方法研究了三个操作参数（水分，熟石灰的添加，磁铁矿精矿的替代）对铁矿石烧结各阶段颗粒的抗碎强度和杨氏模量的贡献。结果表明，铁矿石颗粒的强度性能受其结构的影响，该结构由内核和外粘附层组成。粘附层较厚的颗粒强度随温度升高呈明显的变化趋势，而粘附层较薄的颗粒则表现出更大的波动，因为它们的力-位移响应很大程度上取决于原子核。在大多数状态下，具有较厚粘附层的颗粒通常比具有较稀粘附层的颗粒更容易变形和破碎。信噪比和方差分析表明，水分是影响铁矿石颗粒强度特性的主要参数，因为该因素控制了主要颗粒的结构和材料分布。随着烧结的进行，水分对质量特性的贡献逐渐降低（从约80％到50％），而熟石灰和磁铁矿精矿的贡献相应地增加了（从5％到20％）。