Feldspar production from dimension stone tailings for
201911 · Fig. 3 presents the results of the bar mill tests. After 5 min 100 of the rock was below 600 μm with P 80 approximately 280 μm. The rock showed P 80 around 160 μm only after 15 min of milling. Since Frantz Isodynamic Magnetic Separator usually shows better results for particles above 74 μm no additional tests were performed for higher residence time than 15 min.