Abstract
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 P80 (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.
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Acknowledgments
The present research study is carried out in collaboration between NITK, Surathkal, and JSW Steels, Ballari. The authors are thankful to the management of JSW Steels, Ballari, for their support during the course of this research work. The authors would also like to thank the management of the Partial financial support from Hutti Gold Mines Company Ltd. & Karnataka State Mineral Corporation Ltd. for their partial financial support for this work.
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Hanumanthappa, H., Vardhan, H., Mandela, G.R. et al. Estimation of Grinding Time for Desired Particle Size Distribution and for Hematite Liberation Based on Ore Retention Time in the Mill. Mining, Metallurgy & Exploration 37, 481–492 (2020). https://doi.org/10.1007/s42461-019-00167-8
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DOI: https://doi.org/10.1007/s42461-019-00167-8