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<p>The industrial processes that tailings undergo during beneficiation highly influence their characteristics, causing them to be more angular and less spherical than natural soils. Also, the ever-increasing demand for ores promotes the generation of large volumes of tailings, resulting in some of the largest structures ever constructed. Problems such as particle breakage may arise from these elevated-height structures and can influence the critical state behaviour of geomaterials. Generally, it is assumed that grading changes due to particle breakage cause the critical state line to translate vertically in the <i>v</i> − log <i>p'</i> plane. In tailings, their particle characteristics can modify the particle breakage patterns, directly influencing their macroscopic response. This paper studies silty-sand iron ore tailings, aiming to investigate the effects of particle breakage on the location of the critical state line. Tailings were initially sheared under high pressures and then retrieved and subjected to a second shearing under low pressures. The data shows that the critical state line translates vertically, as observed for sands. However, this effect is connected to the process of remoulding the sample after the first shearing. Moreover, the morphological evolution of tailings particles during shearing is investigated by microscopic analysis using the QicPic apparatus, revealing that tailings particles become more spherical and less angular after shearing, oppositely to what was found for uniform sands.</p>

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How particle breakage affects the critical state line of silty-sand iron ore tailings

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Marina Paula Secco,
  • João Vítor de Azambuja Carvalho,
  • Alexia Cindy Wagner,
  • João Pedro Camelo Guedes,
  • João Paulo de Sousa Silva,
  • Nilo Cesar Consoli

摘要

The industrial processes that tailings undergo during beneficiation highly influence their characteristics, causing them to be more angular and less spherical than natural soils. Also, the ever-increasing demand for ores promotes the generation of large volumes of tailings, resulting in some of the largest structures ever constructed. Problems such as particle breakage may arise from these elevated-height structures and can influence the critical state behaviour of geomaterials. Generally, it is assumed that grading changes due to particle breakage cause the critical state line to translate vertically in the v − log p' plane. In tailings, their particle characteristics can modify the particle breakage patterns, directly influencing their macroscopic response. This paper studies silty-sand iron ore tailings, aiming to investigate the effects of particle breakage on the location of the critical state line. Tailings were initially sheared under high pressures and then retrieved and subjected to a second shearing under low pressures. The data shows that the critical state line translates vertically, as observed for sands. However, this effect is connected to the process of remoulding the sample after the first shearing. Moreover, the morphological evolution of tailings particles during shearing is investigated by microscopic analysis using the QicPic apparatus, revealing that tailings particles become more spherical and less angular after shearing, oppositely to what was found for uniform sands.