Experimental study on crushing strength and Young's modulus of granules in iron ore sintering using Taguchi method_中国颗粒学会

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Partic. vol. 53 pp. 175-185 (December 2020)
doi: 10.1016/j.partic.2020.01.005

Experimental study on crushing strength and Young's modulus of granules in iron ore sintering using Taguchi method

Mingxi Zhou, Hao Zhou*, Jianuo Xu, Jianxiong Xu

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zhouhao@zju.edu.cn

Highlights

    • The Taguchi method was used to evaluate granule strength during iron ore sintering. • The moisture, hydrated lime, and magnetite concentrate contents were varied. • The crushing strength and Young's modulus of granules during sintering were measured. • The relationship between granule structure and strength properties was elucidated. • The contribution of each operating parameter to granule strength was estimated.

Abstract

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%).

Keywords

Iron ore granule; Crushing strength; Young's modulus; Taguchi method