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Genghao Zhang, Deyang zhao, Yi Chang, Yongbo Fan, Renshu Yang, and Shihai Li, Influence of unloading orifice size on the production of microsized ore particles by gas rapid unloading, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-024-3085-3
Genghao Zhang, Deyang zhao, Yi Chang, Yongbo Fan, Renshu Yang, and Shihai Li, Influence of unloading orifice size on the production of microsized ore particles by gas rapid unloading, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-024-3085-3
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卸荷孔尺寸对高压气体快速卸荷粉化矿石效果的影响

摘要: 高压气体快速卸荷(GRU)是一项用于矿石粉碎的创新技术,但目前仍处于发展的早期阶段。提高单个磨矿循环中细粉的产出效率是推动该技术进入工业化应用的关键。本研究重点研究GRU设备的卸荷孔尺寸对矿石粉化效果的影响。实验室实验证明,适度减小卸荷孔尺寸能够显著增强矿石的粉碎效果,提升细颗粒的产率。数值模拟结果显示,卸荷孔尺寸的减小有助于提高气体高速卸荷射流速度,延缓射流压力下降,并在卸荷孔两侧形成更高的压力梯度,从而促进矿石充分粉碎。卸荷孔尺寸设定需参考矿石粒度,以避免矿石在过小孔口出拥堵,阻碍矿石粉碎。卸荷孔的合理缩小有助于提升GRU粉碎矿石的效果,提升高压气体能量利用效率,为工业化GRU设备中卸荷孔尺寸的设定提供了有益的参考。

 

Influence of unloading orifice size on the production of microsized ore particles by gas rapid unloading

Abstract: Gas rapid unloading (GRU) is an innovative technology for ore comminution. Increasing the production of fine powder in each ore grinding cycle is vital for scaling up the GRU method to industrial applications. This study utilizes laboratory experiments to demonstrate that moderately reducing the orifice size significantly enhances pulverization and increases fine particle yield. Numerical simulations suggest that smaller orifices improve pulverization by increasing jet speed, reducing pressure drop, and creating a larger pressure difference inside and outside the unloading orifice. The orifice size should be optimized based on feed size to ensure efficient ore discharge. Reducing the unloading orifice size improves GRU grinding efficiency and energy use, offering guidance for the design of ore discharge ports in future industrial-scale equipment.

 

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