| 摘要 |
PURPOSE:To remove ash from coal with a high efficiency, by providing an auxiliary gas feed pipe not contg. collector, in a flotation tower for separation of coal component and ash in coal. CONSTITUTION:A coal slurry is fed into a flotation tower 1 through a feed pipe 2 and coal particles are caught by air bubbles for ascending, which are supplied through feed pipes 3 and 4, a heater 5, a collector-contg. gas feed pipe 6 and a dispersing plate 7. At the same time, an auxiliary gas not contg. collector is introduced into the tower 1 through a feed pipe 15 and a dispersing plate 16 to speed up ascending of coal particle-carrying air bubbles. The coal particles are taken out of the system through an overflow pipe 11 and residual coal with a high ash content is discharged through a discharge pipe 13. |
