Abstract To ascertain the mechanism that the ore grinding characteristics were improved by high-voltage pulse discharge (HVPD) pre-treatment, an innovative experiment system was performed on magnetite quartzite. The HVPD pre-treatment improved the −0.074 mm mass fraction in ground products, and the increase in pulse number effectively enhanced the mass fraction. The values of relative grindability (K1 and K2) increased with the pulse number significantly, whereas their value reduced as the grinding fineness and grinding time extended. A laser particle size analysis showed that the distribution of HVPD pre-treatment products was uniform. The particle size distribution and cumulative distribution curves satisfied the lognormal distribution function and power function, respectively. The Brunauer–Emmett–Teller (BET) analysis indicated that the specific surface area, total pore volume, and the porosity of crushed products were improved effectively by the HVPD pre-treatment. The internal ore structure became loosened, resulting in the decline in the mechanical properties of the ore; this is conducive to improve the grinding efficiency. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) analyses indicated that the grain-boundary breakage was obtained via the HVPD pre-treatment selectivity.

中文翻译：

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基于高压脉冲放电的磁铁矿石英岩预弱化行为

摘要 为探究高压脉冲放电(HVPD)预处理改善矿石磨矿特性的机理，对磁铁矿石英岩进行了创新实验系统。HVPD预处理提高了研磨产品的-0.074 mm质量分数，脉冲数的增加有效提高了质量分数。相对可磨性（K1和K2）值随着脉冲数的增加而显着增加，而随着研磨细度和研磨时间的延长，它们的值降低。激光粒度分析表明，HVPD 预处理产物的分布是均匀的。粒度分布和累积分布曲线分别满足对数正态分布函数和幂函数。Brunauer-Emmett-Teller (BET) 分析表明，HVPD 预处理有效地提高了粉碎产品的比表面积、总孔容和孔隙率。矿石内部结构松动，导致矿石力学性能下降；这有利于提高研磨效率。扫描电子显微镜 (SEM) 和能量色散 X 射线光谱 (EDS) 分析表明，晶界断裂是通过 HVPD 预处理选择性获得的。