Iron ores obtained from different sources differ in their chemical and physical properties. These variations make the process of grinding a difficult task. The work carried out in this context focuses on three different samples of iron ore, viz., high silica high alumina, low silica high alumina, and low silica low alumina. The grinding process for all the three iron ores is carried out individually in Bond’s ball mill and the total retention time taken by each iron ore sample is calculated. The present investigation focuses on utilizing the calculated retention time of the iron ore as a standard grinding reference time to the laboratory ball mill for optimizing the grinding time of each ore. The desired P 80 (150 μm) with an acceptable range of hematite liberation (> 75%) was obtained in the laboratory ball mill after reducing 6 min from the total retention time taken in the Bond ball mill.

中文翻译：

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基于磨机中矿石滞留时间估算所需粒度分布和赤铁矿释放的研磨时间

从不同来源获得的铁矿石的化学和物理性质不同。这些变化使研磨过程成为一项艰巨的任务。在这方面进行的工作集中在铁矿石的三种不同样品上，即高硅高铝、低硅高铝和低硅低铝。所有三种铁矿石的研磨过程都在邦德的球磨机中单独进行，并计算出每个铁矿石样品的总停留时间。目前的研究重点是利用计算的铁矿石保留时间作为实验室球磨机的标准磨矿参考时间，以优化每种矿石的磨矿时间。所需的 P 80 (150 μm) 具有可接受的赤铁矿释放范围 (>