Abstract The high-pressure grinding roll (HPGR) is a type of roller mill that continuously produces particle-bed comminution. Since the capacity of the HPGR is determined by not only operating conditions but also the roll geometry, knowledge of the effectiveness of the roll geometry is still limited. This study investigated the effect of the stud diameter on the capacity of a stud-type HPGR using the discrete element method with a breakage model. To evaluate the effect of a stud diameter, which is placed on a roll surface, simulations were performed for three types of HPGR having 13-, 6-, and 3.75-mm studs. Simulation results show that the working roll gap increased when a smaller stud was used. This suggests that a roll surface with a smaller stud was likely to provide a stronger force. As a consequence, roll back likely occurred when a smaller stud was used because stronger friction acted on the roll surface. Meanwhile, the stud diameter had less effect on throughput and power during grinding. These trends obtained in simulation qualitatively correspond to those obtained in experiments. Consequently, the study demonstrated that simulation adopting the discrete element method with a breakage model can contribute to the investigation of the effect of roll design in an efficient HPGR grinding.

中文翻译：

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使用离散元法研究辊柱直径对高压磨辊容量的影响

摘要 高压磨辊（HPGR）是一种连续进行颗粒床粉碎的辊磨机。由于 HPGR 的容量不仅取决于操作条件，还取决于轧辊几何形状，因此对轧辊几何形状的有效性的了解仍然有限。本研究使用离散元方法和破损模型研究了螺柱直径对螺柱型 HPGR 容量的影响。为了评估放置在辊表面上的螺柱直径的影响，对具有 13、6 和 3.75 毫米螺柱的三种类型的 HPGR 进行了模拟。模拟结果表明，当使用较小的螺柱时，工作辊间隙会增加。这表明具有较小螺柱的轧辊表面可能提供更强的力。作为结果，当使用较小的螺柱时，很可能会发生回滚，因为作用在辊表面上的摩擦力更大。同时，螺柱直径对磨削过程中的产量和功率的影响较小。在模拟中获得的这些趋势定性地对应于在实验中获得的趋势。因此，该研究表明，采用带有破损模型的离散元方法进行模拟有助于研究轧辊设计对高效 HPGR 磨削的影响。