| Autor: |
Buddhiraju, Venkata Sudheendra, Maheshwari, Shantanu, Rai, Beena, Moys, Michael, Runkana, Venkataramana |
| Zdroj: |
Transactions of the Indian Institute of Metals; Dec2024, Vol. 77 Issue 12, p4221-4230, 10p |
| Abstrakt: |
Mineral liberation from ores is an important step in mineral processing. It is necessary to grind the ore to extremely fine size to liberate the mineral from such ores. The planetary ball mill is promising in that it makes grinding to submicron sizes possible by imparting high energy to the ground powder. In this context, there is a need to understand the dynamics of ultra-fine grinding within the mill. We address this need by studying the movement of media inside the pots and the grinding kinetics, employing both experimental and modeling techniques. The experiments were conducted on a laboratory scale mill. The particle size distribution of the powder was monitored to study the grinding kinetics while video images of the media profiles inside the pots were taken to quantify the media movement as a function of process variables such as media diameter and percent loading. Population balance modeling framework was used to simulate the kinetics of grinding while the discrete element modeling approach was utilized to simulate the media motion. The parameters in the population balance model, namely the specific breakage rate and the breakage distribution function, were determined by fitting the batch grinding equation to the experimental data. The predicted powder size distributions were found to be in reasonable agreement with the experimental data. It was observed that the mean diameter of product powder decreases with the grinding media diameter at a constant energy input. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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