Abstract
The effect of ball size and interstitial filling on the performance of dry ball mill grinding was investigated for a limestone-type brecciated uranium ore. The optimum grinding was obtained with the combination of different balls (12.7–37.5 mm) and interstitial filling of 50% (20% ball filling ratio at fixed material filling ratio = 4%). The net power consumption in a ball mill is proportional to the specific rate of breakage. A mathematical relation for the specific rate of breakage as a function of ball filling ratio was developed. The grinding process was modeled by the combined use of matrix and population balance model. The cumbersome method of mono-size fraction in the determination of the selection function was avoided, and instead, it was determined by the back-calculation method. The estimated parameters of the Austin selection function for a particular ball size (31.7 mm) were successfully applied in predicting the ground product size distribution (R2 > 0.95) for both a given feed size distribution and a given feed rate.
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Acknowledgements
The authors are thankful to Dr. T. Sreenivas, Head, Mineral Processing Division, and Dr. Vivekanand Kain, Director, Materials Group, Bhabha Atomic Research Centre, Mumbai, for their interest and encouragement in the studies. The authors also express gratitude to their colleagues for chemical analysis. Gratitude is also extended to UCIL and AMD for supplying the uranium ore sample.
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Serajuddin, M., Mukhopadhyay, S. & Kacham, A.R. Optimization of Ball Mill Grinding of a Limestone-Type Brecciated Uranium Ore. Trans Indian Inst Met 76, 2253–2261 (2023). https://doi.org/10.1007/s12666-023-02926-0
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DOI: https://doi.org/10.1007/s12666-023-02926-0