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<p>Roasting is a critical step in the hydrometallurgical zinc-smelting route. After validating the model's reliability against experimental data, this study performs numerical simulations of the roasting process in a fluidized-bed roaster using the multiphase particle-in-cell (MP-PIC) method. The effects of particle size distribution (PSD) on gas-solid flow patterns, bubble shape characteristics, and the thermal field distribution of solid particles are systematically investigated. The results show that the bubble volume first increases and then decreases along the axial direction, and broader PSDs lead to smaller bubble volumes. As the reactor height increases, both the temperature and heat transfer coefficient (HTC) of particles increase monotonically. Likewise, increasing PSD width enhances particle temperature and HTC throughout the reactor. These findings highlight the pronounced influence of PSD width on bubble dynamics and particle thermal behavior in fluidized-bed roasters, offering insights to improve process performance, heat-transfer efficiency, and industrial operation of fluidized roasting systems.</p>

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Numerical Study of the Dense Gas-Solid Reactive Pattern in the Fluidized Bed Roasting Process of Zinc Sulfide Concentrate

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Junyi Hu,
  • Shiliang Yang,
  • Yingjun Song,
  • Shuliu Yang,
  • Hua Wang

摘要

Roasting is a critical step in the hydrometallurgical zinc-smelting route. After validating the model's reliability against experimental data, this study performs numerical simulations of the roasting process in a fluidized-bed roaster using the multiphase particle-in-cell (MP-PIC) method. The effects of particle size distribution (PSD) on gas-solid flow patterns, bubble shape characteristics, and the thermal field distribution of solid particles are systematically investigated. The results show that the bubble volume first increases and then decreases along the axial direction, and broader PSDs lead to smaller bubble volumes. As the reactor height increases, both the temperature and heat transfer coefficient (HTC) of particles increase monotonically. Likewise, increasing PSD width enhances particle temperature and HTC throughout the reactor. These findings highlight the pronounced influence of PSD width on bubble dynamics and particle thermal behavior in fluidized-bed roasters, offering insights to improve process performance, heat-transfer efficiency, and industrial operation of fluidized roasting systems.